Faculty Profiles - SUDO Kengo

写真a

SUDO Kengo

Organization

Graduate School of Environmental Studies Department of Earth and Environmental Sciences Climate Science Professor

Graduate School

Graduate School of Environmental Studies

Undergraduate School

School of Science Department of Earth and Planetary Science

Contact information

Homepage

http://chaser.has.env.nagoya-u.ac.jp/aecm

Degree 1

Doctor of Science (Ph.D) （ 2003.3 The University of Tokyo ）

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Research Interests 10

Atmospheric Oxidation Power
Future Climate Projection
Air Pollution
Stratospheric and Tropospheric Ozone
Global Warming
Chemical Transport Model
Chemistry-Climate Modelling
Climate Dynamics
Aerosols
Atmospheric Chemistry

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Research Areas 4

Others / Others / Chemical Transport Modelling
Others / Others / Atmospheric Chemistry and Aerosols
Others / Others / Climate Modelling
Others / Others / meteorology

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Current Research Project and SDGs 7

Development of warming mitigation measures with controling short-lived climate pollutants (SLCPs/SLCFs)
Impacts of land use and aerosols changes on Asian climate and monsoon
* Study of Hemispheric to Global-scale Atmospheric Transport of Pollutants and their Source Attribution
Chemistry and Climate Interaction
* Study on the Impacts of Atmospheric Composition Changes on Climate: past reproduction and future projection
* Study of Global Changes in Atmospheric Composition and Their Mechanism
* Global modelling of atmospheric pollution and its impacts on climate

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Research History 5

名古屋大学　大学院環境学研究科・地球環境科学専攻・気候科学講座教授

2019.4

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Country：Japan
名古屋大学　大学院環境学研究科・地球環境科学専攻・気候科学講座准教授

2007.4 - 2019.3

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Country：Japan
名古屋大学大学院環境学研究科・地球環境科学専攻・気候科学講座助教授

2006.4 - 2007.3

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独立行政法人海洋研究開発機構・地球環境フロンティア研究センター/ 大気組成変動予測研究プログラム　

2004.7 - 2006.3

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海洋科学技術センター・地球フロンティア研究システム　大気組成変動予測研究領域

2003.4 - 2004.6

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Country：Japan

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Education 3

The University of Tokyo Graduate School, Division of Science Earth and Planetary Science

2000.4 - 2003.3

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Country： Japan
The University of Tokyo Graduate School, Division of Science Earth and Planetary Science

1998.4 - 2000.3

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Country： Japan
The University of Tokyo Faculty of Science Dept. of Earth and Planetary Science

1994.4 - 1998.3

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Country： Japan

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Professional Memberships 5

米国地球物理学会(AGU)
欧州大気組成変動研究ネットワーク（ACCENT）
日本気象学会
日本大気化学会
日本エアロゾル学会

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Committee Memberships 13

日本学術会議　環境学委員会・地球惑星科学委員会合同FE・WCRP合同分科会IGAC小委員会委員

2021.1
日本学術会議環境学委員会・地球惑星科学委員会合同FE・WCRP合同分科会iLEAPS小委員会委員(24期)

2018.4
国立環境研究所・次世代型温室効果ガス観測衛星に関する検討研究会委員

2016.4 - 2017.3
The Japan Society of Atmospheric Chemistry (JSAC) steering committee member

2013.4 - 2014.3
日本学術会議・環境学委員会・地球惑星科学委員会合同IGBP・WCRP・DIVERSITAS合同分科会　IGAC小委員会委員(22期)

2012.4 - 2015.3
総合科学技術会議　評価専門調査会南極地域観測事業評価検討会評価委員

2012.4 - 2013.3
Journal of the Meteorological Society of Japan Editor

2011.6
日本大気化学会機関誌編集委員

2011.4 - 2014.3
大気環境衛星検討委員会（APPOLOチーム）委員

2011.4 - 2014.3
The Japan Society of Atmospheric Chemistry (JSAC) steering committee member

2011.4 - 2012.3
日本学術会議・環境学委員会・地球惑星科学委員会合同IGBP・WCRP合同分科会　IGAC小委員会委員(21期)

2009.4 - 2012.3
日本学術会議・環境学委員会・地球惑星科学委員会合同IGBP・WCRP合同分科会　IGAC小委員会委員(20期)

2006.4 - 2009.3
日本学術会議国内IGAC小委員会委員(19期)

2004.4 - 2006.3

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Awards 3

日本気象学会堀内賞

2020.10 日本気象学会化学気候モデルの開発と大気環境・気候変動研究の推進

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Award type：Award from Japanese society, conference, symposium, etc.

須藤教授は、大気化学・気候相互作用研究を開拓・牽引し、物質循環を軸として、気象学の周辺領域の拡充に大きく貢献してきた。須藤教授が行ってきた、化学気候モデルおよび地球システムモデルの開発、化学・気候相互作用の研究、大気微量成分の長距離輸送と起源の推定、地球温暖化緩和策の構築、などの業績は、気象学の発展・向上に大きな影響を与えているものと認められる。このため、日本気象学会は須藤健悟教授に2020年度堀内賞を贈呈するものである。
日本大気化学会奨励賞

2012.11 日本大気化学会化学・エアロゾル結合気候モデルの開発と全球における対流圏オゾン変動・起源推定に関する研究

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Award type：Award from Japanese society, conference, symposium, etc.

須藤会員は，全球化学輸送モデルを我が国で初めて開発し、その後これをベースに気候モデルとの結合を行って化学気候モデル（CHASER）へと発展させてきた。さらに、開発した化学輸送モデルを我が国の地球システムモデル（MIROC-ESM）に組み込み、成層圏・対流圏での大気化学と微小粒子（エアロゾル）を網羅的に取り扱える全球シミュレーションの手法を確立してきた。また、対流圏のオゾンやエアロゾルなどの汚染物質がどこからどのように輸送されてくるのかに着目した実験手法を開発し、大気中の長距離輸送や越境汚染の構造を全球スケールで解明した。さらに、オゾンやエアロゾルが及ぼす気候への影響・相互作用などを研究し、気候変動・大気汚染の要因を定量化するとともに、将来予測も行い、IPCC第４次報告書にも大きく貢献した。このように、須藤会員は一貫して大気化学と気候を包括的に扱える独自のモデルを開発し、これを用いた研究の成果は国内外で高く評価されており、大気化学研究会奨励賞に値する。
日本気象学会2004年度山本・正野論文賞（山本賞)

2004

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Country：Japan

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Papers 172

Global tropospheric ozone responses to reduced NOx emissions linked to the COVID-19 world-wide lockdowns Invited Reviewed International coauthorship

Miyazaki, Kazuyuki & Bowman, Kay & Sekiya, Takashi & Takigawa, Masayuki & Neu, Jessica & Sudo, Kengo & Osterman, Greg & Eskes, Henk.

Earth and Space Science Open Archive ESSOAr 2020.12

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1002/essoar.10504795.1
Interplay of Climate Change and Air Pollution- Projection of the under-5 mortality attributable to ambient particulate matter (PM2.5) in South Asia Reviewed International coauthorship

Anita W.M., Uttajug A., Seposo X.T., Sudo K., Nakata M., Takemura T., Takano H., Fujiwara T., Ueda K.

Environmental Research Vol. 248 2024.5

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Language：English Publishing type：Research paper (scientific journal) Publisher：Environmental Research

Ambient fine particulate matter (PM2.5) pollution is a leading health risk factor for children under- 5 years, especially in developing countries. South Asia is a PM2.5 hotspot, where climate change, a potential factor affecting PM2.5 pollution, adds a major challenge. However, limited evidence is available on under-5 mortality attributable to PM2.5 under different climate change scenarios. This study aimed to project under-5 mortality attributable to long-term exposure to ambient PM2.5 under seven air pollution and climate change mitigation scenarios in South Asia. We used a concentration-risk function obtained from a previous review to project under-5 mortality attributable to ambient PM2.5. With a theoretical minimum risk exposure level of 2.4 μg/m3, this risk function was linked to gridded annual PM2.5 concentrations from atmospheric modeling to project under-5 mortality from 2010 to 2049 under different climate change mitigation scenarios. The scenarios were developed from the Aim/Endues global model based on end-of-pipe (removing the emission of air pollutants at the source, EoP) and 2 °C target measures. Our results showed that, in 2010–2014, about 306.8 thousand under-5 deaths attributable to PM2.5 occurred in South Asia under the Reference (business as usual) scenario. The number of deaths was projected to increase in 2045–2049 by 36.6% under the same scenario and 7.7% under the scenario where EoP measures would be partially implemented by developing countries (EoPmid), and was projected to decrease under other scenarios, with the most significant decrease (81.2%) under the scenario where EoP measures would be fully enhanced by all countries along with the measures to achieve 2 °C target (EoPmaxCCSBLD) across South Asia. Country-specific projections of under-5 mortality varied by country. The current emission control strategy would not be sufficient to reduce the number of deaths in South Asia. Robust climate change mitigation and air pollution control policy implementation is required.

DOI： 10.1016/j.envres.2024.118292

Scopus
Plant Molecular Phenology and Climate Feedbacks Mediated by BVOCs Invited Reviewed

• Satake, A., Hagiwara, T., Nagano, A., Yamaguchi, N., Sekimoto, K., Shiojiri,K., Sudo

2024.2

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Authorship：Last author Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1146/annurev-arplant-060223-032108
Historical (1960-2014) lightning and LNOx trends and their controlling factors in a chemistry-climate model Reviewed International coauthorship

He Y., Sudo K.

Atmospheric Chemistry and Physics Vol. 23 ( 20 ) page： 13061 - 13085 2023.10

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Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：Atmospheric Chemistry and Physics

Lightning can cause natural hazards that result in human and animal injuries and fatalities, infrastructure destruction, and wildfire ignition. Lightning-produced NOx (LNOx), a major NOx (NOxCombining double low lineNO+NO2) source, plays a vital role in atmospheric chemistry and global climate. The Earth has experienced marked global warming and changes in aerosol and aerosol precursor emissions (AeroPEs) since the 1960s. Investigating long-term historical (1960-2014) lightning and LNOx trends can provide important indicators for all lightning-related phenomena and for LNOx effects on atmospheric chemistry and global climate. Understanding how global warming and changes in AeroPEs influence historical lightning and LNOx trends can be helpful in providing a scientific basis for assessing future lightning and LNOx trends. Moreover, global lightning activities' responses to large volcanic eruptions such as the 1991 Pinatubo eruption are not well elucidated and are worth exploring. This study employed the widely used cloud top height lightning scheme (CTH scheme) and the newly developed ice-based ECMWF-McCAUL lightning scheme to investigate historical (1960-2014) lightning and LNOx trends and variations as well as their influencing factors (global warming, increases in AeroPEs, and the Pinatubo eruption) in the framework of the CHASER (MIROC) chemistry-climate model. The results of the sensitivity experiments indicate that both lightning schemes simulated almost flat global mean lightning flash rate anomaly trends during 1960-2014 in CHASER (the Mann-Kendall trend test (significance inferred as 5 %) shows no trend for the ECMWF-McCAUL scheme, but a 0.03 %yr-1 significant increasing trend is detected for the CTH scheme). Moreover, both lightning schemes suggest that past global warming enhances historical trends for global mean lightning density and global LNOx emissions in a positive direction (around 0.03 %yr-1 or 3 %K-1). However, past increases in AeroPEs exert an opposite effect on the lightning and LNOx trends (-0.07 % to -0.04 %yr-1 for lightning and -0.08 % to -0.03 %yr-1 for LNOx) when one considers only the aerosol radiative effects in the cumulus convection scheme. Additionally, effects of past global warming and increases in AeroPEs in lightning trends were found to be heterogeneous across different regions when analyzing lightning trends on the global map. Lastly, this paper is the first of study results suggesting that global lightning activities were markedly suppressed during the first year after the Pinatubo eruption as shown in both lightning schemes (global lightning activities decreased by as much as 18.10 % as simulated by the ECMWF-McCAUL scheme). Based on the simulated suppressed lightning activities after the Pinatubo eruption, the findings also indicate that global LNOx emissions decreased after the 2- to 3-year Pinatubo eruption (1.99 %-8.47 % for the annual percentage reduction). Model intercomparisons of lightning flash rate trends and variations between our study (CHASER) and other Coupled Model Intercomparison Project Phase 6 (CMIP6) models indicate great uncertainties in historical (1960-2014) global lightning trend simulations. Such uncertainties must be investigated further.

DOI： 10.5194/acp-23-13061-2023

Scopus
Using Regionalized Air Quality Model Performance and Bayesian Maximum Entropy data fusion to map global surface ozone concentration Reviewed International coauthorship

Becker J.S., DeLang M.N., Chang K.L., Serre M.L., Cooper O.R., Wang H., Schultz M.G., Schröder S., Lu X., Zhang L., Deushi M., Josse B., Keller C.A., Lamarque J.F., Lin M., Liu J., Marécal V., Strode S.A., Sudo K., Tilmes S., Zhang L., Brauer M., West J.J.

Elementa: Science of the Anthropocene Vol. 11 ( 1 ) 2023.10

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Language：English Publishing type：Research paper (scientific journal) Publisher：Elementa

Estimates of ground-level ozone concentrations have been improved through data fusion of observations and atmospheric chemistry models. Our previous global ozone estimates for the Global Burden of Disease study corrected for bias uniformly across continents and then corrected near monitoring stations using the Bayesian Maximum Entropy (BME) framework for data fusion. Here, we use the Regionalized Air Quality Model Performance (RAMP) framework to correct model bias over a much larger spatial range than BME can, accounting for the spatial inhomogeneity of bias and nonlinearity as a function of modeled ozone. RAMP bias correction is applied to a composite of 9 global chemistry-climate models, based on the nearest set ofmonitors. These estimates are then fused with observations using BME, which matches observations at measurement stations, with the influence of observations declining with distance in space and time.We create global ozone maps for each year from 1990 to 2017 at fine spatial resolution. RAMP is shown to create unrealistic discontinuities due to the spatial clustering of ozone monitors, which we overcome by applying a weighting for RAMP based on the number of monitors nearby. Incorporating RAMP before BME has little effect on model performance near stations, but strongly increases R2 by 0.15 at locations farther from stations, shown through a checkerboard cross-validation. Corrections to estimates differ based on location in space and time, confirming heterogeneity. We quantify the likelihood of exceeding selected ozone levels, finding that parts of the Middle East, India, and China are most likely to exceed 55 parts per billion (ppb) in 2017. About 96% of the global population was exposed to ozone levels above theWorld Health Organization guideline of 60 mg m-3 (30 ppb) in 2017. Our annual fine-resolution ozone estimates may be useful for several applications including epidemiology and assessments of impacts on health, agriculture, and ecosystems.

DOI： 10.1525/elementa.2022.00025

Scopus
The worldwide COVID-19 lockdown impacts on global secondary inorganic aerosols and radiative budget Reviewed International coauthorship

Sekiya, T; Miyazaki, K; Eskes, H; Bowman, K; Sudo, K; Kanaya, Y; Takigawa, M

SCIENCE ADVANCES Vol. 9 ( 30 ) 2023.7

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Language：English Publishing type：Research paper (scientific journal) Publisher：Science Advances

Global lockdown measures to prevent the spread of the coronavirus disease 2019 (COVID-19) led to air pollutant emission reductions. While the COVID-19 lockdown impacts on both trace gas and total particulate pollutants have been widely investigated, secondary aerosol formation from trace gases remains unclear. To that end, we quantify the COVID-19 lockdown impacts on NOx and SO2 emissions and sulfate-nitrate-ammonium aerosols using multiconstituent satellite data assimilation and model simulations. We find that anthropogenic emissions over major polluted regions were reduced by 19 to 25% for NOx and 14 to 20% for SO2 during April 2020. These emission reductions led to 8 to 21% decreases in sulfate and nitrate aerosols over highly polluted areas, corresponding to >34% of the observed aerosol optical depth declines and a global aerosol radiative forcing of +0.14 watts per square meter relative to business-as-usual scenario. These results point to the critical importance of secondary aerosol pollutants in quantifying climate impacts of future mitigation measures.

DOI： 10.1126/sciadv.adh2688

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Scopus

PubMed
Implementation of HONO into the chemistry–climate model CHASER (V4.0): roles in tropospheric chemistry Reviewed International coauthorship

Ha, P. T. M., Kanaya, Y., Taketani, F., Andrés Hernández, M. D., Schreiner, B., Pfeilsticker, K., and Sudo, K.

Geosci. Model Dev. Vol. 16 page： 927 - 960 2023.2

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DOI： https://doi.org/10.5194/gmd-16-927-2023

Other Link： https://gmd.copernicus.org/articles/16/927/2023/
Implementation of HONO into the chemistry-climate model CHASER (V4.0): roles in tropospheric chemistry

Ha, PTM; Kanaya, Y; Taketani, F; Hernández, MDA; Schreiner, B; Pfeilsticker, K; Sudo, K

GEOSCIENTIFIC MODEL DEVELOPMENT Vol. 16 ( 3 ) page： 927 - 960 2023.2

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Language：English Publishing type：Research paper (scientific journal) Publisher：Geoscientific Model Development

Nitrous acid (HONO) is an important atmospheric gas given its contribution to the cycles of NOx and HOx, but its role in global atmospheric photochemistry is not fully understood. This study implemented three pathways of HONO formation in the chemistry-climate model CHASER (MIROC-ESM) to explore three physical phenomena: gas-phase kinetic reactions (GRs), direct emission (EM), and heterogeneous reactions on cloud and aerosol particles (HRs). We evaluated the simulations by the atmospheric aircraft-based measurements from EMeRGe-Asia-2018 (Effect of Megacities on the Transport and Transformation of Pollutants on the Regional to Global Scales), ATom-1 (atmospheric tomography), observations from the ship R/V Mirai, EANET (Acid Deposition Monitoring Network in eastern Asia)/EMEP (European Monitoring and Evaluation Programme) ground-based stationary observations, and the OMI (Ozone Monitoring Instrument). We showed that the inclusion of the HONO chemistry in the modelling process reduced the model bias against the measurements for PM2.5, NO3-/HNO3, NO2, OH, HO2, O3, and CO, especially in the lower troposphere and the North Pacific (NP) region. We found that the retrieved global abundance of tropospheric HONO was 1.4gTgN. Of the three source pathways, HRs and EM contributed 63g% and 26g% to the net HONO production, respectively. We also observed that reactions on the aerosol surfaces contributed larger amounts of HONO (51g%) than those on the cloud surfaces (12g%). The model exhibited significant negative biases for daytime HONO in the Asian off-the-coast region, compared with the airborne measurements by EMeRGe-Asia-2018, indicating the existence of unknown daytime HONO sources. Strengthening of aerosol uptake of NO2 near the surface and in the middle troposphere, cloud uptake, and direct HONO emission were all potential yet-unknown HONO sources. The most promising daytime source for HONO found in this study was the combination of enhanced aerosol uptake of NO2 and surface-catalysed HNO3 photolysis (maxST+JANO3-B case), which could also remedy the model bias for NO2 and O3 during EMeRGe. We also found that the simulated HONO abundance and its impact on NOx-O3 chemistry were sensitive to the yield of the heterogeneous conversion of NO2 to HONO (vs. HNO3). Inclusion of HONO reduced global tropospheric NOx (NO + NO2) levels by 20.4g%, thereby weakening the tropospheric oxidizing capacity (OH, O3) occurring for NOx-deficit environments (remote regions and upper altitudes), which in turn increased CH4 lifetime (13g%) and tropospheric CO abundance (8g%). The calculated reduction effect on the global ozone level reduced the model overestimates for tropospheric column ozone against OMI spaceborne observations for a large portion of the North Hemisphere. HRs on the surfaces of cloud particles, which have been neglected in previous modelling studies, were the main drivers of these impacts. This effect was particularly salient for the substantial reductions of levels of OH (40g%-67g%) and O3 (30g%-45g%) in the NP region during summer, given the significant reduction of the NOx level (50g%-95g%). In contrast, HRs on aerosol surfaces in China (Beijing) enhanced OH and O3 winter mean levels by 600g%-1700g% and 10g%-33g%, respectively, with regards to their minima in winter. Furthermore, sensitivity simulations revealed that the heterogeneous formation of HONO from NO2 and heterogenous photolysis of HNO3 coincided in the real atmosphere. Nevertheless, the global effects calculated in the combined case (enhancing aerosol uptakes of NO2 and implementing heterogeneous photolysis of HNO3), which most captured the measured daytime HONO level, still reduced the global tropospheric oxidizing capacity. Overall, our findings suggest that a global model that does not consider HONO heterogeneous mechanisms (especially photochemical heterogeneous formations) may erroneously predict the effect of HONO in remote areas and polluted regions.

DOI： 10.5194/gmd-16-927-2023

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Scopus
Multi-axis differential optical absorption spectroscopy (MAX-DOAS) observations of formaldehyde and nitrogen dioxide at three sites in Asia and comparison with the global chemistry transport model CHASER Reviewed International coauthorship

Syedul Hoque Hossain Mohammed, Sudo Kengo, Irie Hitoshi, Damiani Alessandro, Naja Manish, Fatmi Al Mashroor

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 22 ( 18 ) page： 12559 - 12589 2022.9

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Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：Atmospheric Chemistry and Physics

Formaldehyde (HCHO) and nitrogen dioxide (NO2) concentrations and profiles were retrieved from ground-based multi-axis differential optical absorption spectroscopy (MAX-DOAS) observations during January 2017-December 2018 at three sites in Asia: (1) Phimai (15.18°N, 102.5°E), Thailand; (2) Pantnagar (29°N, 78.90°E) in the Indo-Gangetic Plain (IGP), India; and (3) Chiba (35.62°N, 140.10°E), Japan. Retrievals were performed using the Japanese MAX-DOAS profile retrieval algorithm ver. 2 (JM2). The observations were used to evaluate the NO2 and HCHO partial columns and profiles (0-4 km) simulated using the global chemistry transport model (CTM) CHASER (Chemical Atmospheric General Circulation Model for Study of Atmospheric Environment and Radiative Forcing). The NO2 and HCHO concentrations at all three sites showed consistent seasonal variation throughout the investigated period. Biomass burning affected the HCHO and NO2 variations at Phimai during the dry season and at Pantnagar during spring (March-May) and post-monsoon (September-November). Results found for the HCHO-to-NO2 ratio (RFN), an indicator of high ozone sensitivity, indicate that the transition region (i.e., 1 < RFN < 2) changes regionally, echoing the recent finding for RFN effectiveness. Moreover, reasonable estimates of transition regions can be derived, accounting for the NO2-HCHO chemical feedback. The model was evaluated against global NO2 and HCHO columns data retrieved from Ozone Monitoring Instrument (OMI) observations before comparison with ground-based datasets. Despite underestimation, the model well simulated the satellite-observed global spatial distribution of NO2 and HCHO, with respective spatial correlations (r) of 0.73 and 0.74. CHASER demonstrated good performance, reproducing the MAX-DOAS-retrieved HCHO and NO2 abundances at Phimai, mainly above 500 m from the surface. Model results agree with the measured variations within the 1-sigma (1σ) standard deviation of the observations. Simulations at higher resolution improved the modeled NO2 estimates for Chiba, reducing the mean bias error (MBE) for the 0-2 km height by 35 %, but resolution-based improvements were limited to surface layers. Sensitivity studies show that at Phimai, pyrogenic emissions contribute up to 50 % and 35 % to HCHO and NO2 concentrations, respectively. Copyright:

DOI： 10.5194/acp-22-12559-2022

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Scopus
Introducing new lightning schemes into the CHASER (MIROC) chemistry-climate model Reviewed International coauthorship

He Yanfeng, Hoque Hossain Mohammed Syedul, Sudo Kengo

GEOSCIENTIFIC MODEL DEVELOPMENT Vol. 15 ( 14 ) page： 5627 - 5650 2022.7

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Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：Geoscientific Model Development

The formation of nitrogen oxides (NOx) associated with lightning activities (hereinafter designated as LNOx) is a major source of NOx. In fact, it is regarded as the dominant NOx source in the middle to upper troposphere. Therefore, improving the prediction accuracy of lightning and LNOx in chemical climate models is crucially important. This study implemented three new lightning schemes with the CHASER (MIROC) global chemical transport and climate model. The first lightning scheme is based on upward cloud ice flux (ICEFLUX scheme). The second one (the original ECMWF scheme), also adopted in the European Centre for Medium-Range Weather Forecasts (ECMWF) forecasting system, calculates lightning flash rates as a function of QR (a quantity intended to represent the charging rate of collisions between graupel and other types of hydrometeors inside the charge separation region), convective available potential energy (CAPE), and convective cloud-base height. For the original ECMWF scheme, by tuning the equations and adjustment factors for land and ocean, a new lightning scheme called the ECMWF-McCAUL scheme was also tested in CHASER. The ECMWF-McCAUL scheme calculates lightning flash rates as a function of CAPE and column precipitating ice. In the original version of CHASER (MIROC), lightning is initially parameterized with the widely used cloud-top height scheme (CTH scheme). Model evaluations with lightning observations conducted using the Lightning Imaging Sensor (LIS) and Optical Transient Detector (OTD) indicate that both the ICEFLUX and ECMWF schemes simulate the spatial distribution of lightning more accurately on a global scale than the CTH scheme does. The ECMWF-McCAUL scheme showed the highest prediction accuracy for the global distribution of lightning. Evaluation by atmospheric tomography (ATom) aircraft observations (NO) and tropospheric monitoring instrument (TROPOMI) satellite observations (NO2) shows that the newly implemented lightning schemes partially facilitated the reduction of model biases (NO and NO2), typically within the regions where LNOx is the major source of NOx, when compared to using the CTH scheme. Although the newly implemented lightning schemes have a minor effect on the tropospheric mean oxidation capacity compared to the CTH scheme, they led to marked changes in oxidation capacity in different regions of the troposphere. Historical trend analyses of flash and surface temperatures predicted using CHASER (2001-2020) show that lightning schemes predicted increasing trends of lightning or no significant trends, except for one case of the ICEFLUX scheme, which predicted a decreasing trend of lightning. The global lightning rates of increase during 2001-2020 predicted by the CTH scheme were 17.69% C-1 and 2.50% C-1, respectively, with and without meteorological nudging. The un-nudged runs also included the short-term surface warming but without the application of meteorological nudging. Furthermore, the ECMWF schemes predicted a larger increasing trend of lightning flash rates under the short-term surface warming by a factor of 4 (ECMWF-McCAUL scheme) and 5 (original ECMWF scheme) compared to the CTH scheme without nudging. In conclusion, the three new lightning schemes improved global lightning prediction in the CHASER model. However, further research is needed to assess the reproducibility of trends of lightning over longer periods.

DOI： 10.5194/gmd-15-5627-2022

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Scopus
A comparison of the impact of TROPOMI and OMI tropospheric NO2 on global chemical data assimilation

Sekiya, T; Miyazaki, K; Eskes, H; Sudo, K; Takigawa, M; Kanaya, Y

ATMOSPHERIC MEASUREMENT TECHNIQUES Vol. 15 ( 6 ) page： 1703 - 1728 2022.3

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Language：English Publishing type：Research paper (scientific journal) Publisher：Atmospheric Measurement Techniques

This study gives a systematic comparison of the Tropospheric Monitoring Instrument (TROPOMI) version 1.2 and Ozone Monitoring Instrument (OMI) QA4ECV tropospheric NO2 column through global chemical data assimilation (DA) integration for the period April-May 2018. DA performance is controlled by measurement sensitivities, retrieval errors, and coverage. The smaller mean relative observation errors by 16g% in TROPOMI than OMI over 60g gN-60g gS during April-May 2018 led to larger reductions in the global root-mean-square error (RMSE) against the assimilated NO2 measurements in TROPOMI DA (by 54g%) than in OMI DA (by 38g%). Agreements against the independent surface, aircraft-campaign, and ozonesonde observation data were also improved by TROPOMI DA compared to the control model simulation (by 12g%-84g% for NO2 and by 7g%-40g% for ozone), which were more obvious than those by OMI DA for many cases (by 2g%-70g% for NO2 and by 1g%-22g% for ozone) due to better capturing spatial and temporal variability by TROPOMI DA. The estimated global total NOx emissions were 15g% lower in TROPOMI DA, with 2g%-23g% smaller regional total emissions, in line with the observed negative bias of the TROPOMI version 1.2 product compared to the OMI QA4ECV product. TROPOMI DA can provide city-scale emission estimates, which were within 10g% differences with other high-resolution analyses for several limited areas, while providing a globally consistent analysis. These results demonstrate that TROPOMI DA improves global analyses of NO2 and ozone, which would also benefit studies on detailed spatial and temporal variations in ozone and nitrate aerosols and the evaluation of bottom-up NOx emission inventories.

DOI： 10.5194/amt-15-1703-2022

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Scopus
A comparison of the impact of TROPOMI and OMI tropospheric NO2 on global chemical data assimilation Reviewed International coauthorship

Sekiya, T., Miyazaki, K., Eskes, H., Sudo, K., Takigawa, M., and Kanaya, Y.

Atmospheric Measurement Techniques 2022.3

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Language：English Publishing type：Research paper (scientific journal)

DOI： https://doi.org/10.5194/amt-2021-400
Effects of heterogeneous reactions on tropospheric chemistry: a global simulation with the chemistry-climate model CHASER V4.0 Reviewed International coauthorship

Ha Phuc T. M., Matsuda Ryoki, Kanaya Yugo, Taketani Fumikazu, Sudo Kengo

GEOSCIENTIFIC MODEL DEVELOPMENT Vol. 14 ( 6 ) page： 3813 - 3841 2021.6

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Authorship：Last author Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/gmd-14-3813-2021

Web of Science
Responses of Arctic black carbon and surface temperature to multi-region emission reductions: a Hemispheric Transport of Air Pollution Phase 2 (HTAP2) ensemble modeling study Reviewed

Zhao Na, Dong Xinyi, Huang Kan, Fu Joshua S., Lund Marianne Tronstad, Sudo Kengo, Henze Daven, Kucsera Tom, Lam Yun Fat, Chin Mian, Tilmes Simone

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 21 ( 11 ) page： 8637 - 8654 2021.6

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/acp-21-8637-2021

Web of Science
Impacts of Horizontal Resolution on Global Data Assimilation of Satellite Measurements for Tropospheric Chemistry Analysis Reviewed International coauthorship

Sekiya, Takashi; Miyazaki, Kazuyuki; Ogochi, Koji; Sudo, Kengo; Takigawa, Masayuki; Eskes, Henk; Boersma, K. Folkert

Journal of Advances in Modeling Earth Systems Vol. 13 ( 6 ) 2021.6

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1029/2020MS002180
Global tropospheric ozone responses to reduced NOx emissions linked to the COVID-19 worldwide lockdowns

Miyazaki, K; Bowman, K; Sekiya, T; Takigawa, M; Neu, JL; Sudo, K; Osterman, G; Eskes, H

SCIENCE ADVANCES Vol. 7 ( 24 ) 2021.6

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Language：English Publishing type：Research paper (scientific journal) Publisher：Science Advances

Efforts to stem the transmission of coronavirus disease 2019 (COVID-19) led to rapid, global ancillary reductions in air pollutant emissions. Here, we quantify the impact on tropospheric ozone using a multiconstituent chemical data assimilation system. Anthropogenic NOx emissions dropped by at least 15% globally and 18 to 25% regionally in April and May 2020, which decreased free tropospheric ozone by up to 5 parts per billion, consistent with independent satellite observations. The global total tropospheric ozone burden declined by 6TgO3 (∼2%) in May and June 2020, largely due to emission reductions in Asia and the Americas that were amplified by regionally high ozone production efficiencies (up to 4 TgO3/TgN). Our results show that COVID-19 mitigation left a global atmospheric imprint that altered atmospheric oxidative capacity and climate radiative forcing, providing a test of the efficacy of NOx emissions controls for co-benefiting air quality and climate.

DOI： 10.1126/sciadv.abf7460

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Scopus

PubMed
Continuous multi-component MAX-DOAS observations for the planetary boundary layer ozone variation analysis at Chiba and Tsukuba, Japan, from 2013 to 2019 Reviewed International coauthorship

Irie Hitoshi, Yonekawa Daichi, Damiani Alessandro, Hoque Hossain Mohammed Syedul, Sudo Kengo, Itahashi Syuichi

PROGRESS IN EARTH AND PLANETARY SCIENCE Vol. 8 ( 1 ) 2021.5

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1186/s40645-021-00424-9

Web of Science
Mapping Yearly Fine Resolution Global Surface Ozone through the Bayesian Maximum Entropy Data Fusion of Observations and Model Output for 1990-2017 Reviewed International coauthorship

DeLang Marissa N., Becker Jacob S., Chang Kai-Lan, Serre Marc L., Cooper Owen R., Schultz Martin G., Schroeder Sabine, Lu Xiao, Zhang Lin, Deushi Makoto, Josse Beatrice, Keller Christoph A., Lamarque Jean-Francois, Lin Meiyun, Liu Junhua, Marecal Virginie, Strode Sarah A., Sudo Kengo, Tilmes Simone, Zhang Li, Cleland Stephanie E., Collins Elyssa L., Brauer Michael, West J. Jason

ENVIRONMENTAL SCIENCE & TECHNOLOGY Vol. 55 ( 8 ) page： 4389 - 4398 2021.4

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1021/acs.est.0c07742

Web of Science
Contributions of World Regions to the Global Tropospheric Ozone Burden Change From 1980 to 2010 Reviewed International coauthorship

Zhang Yuqiang, West J. Jason, Emmons Louisa K., Flemming Johannes, Jonson Jan Eiof, Lund Marianne T., Sekiya Takashi, Sudo Kengo, Gaudel Audrey, Chang Kai-Lan, Nedelec Philippe, Thouret Valerie

GEOPHYSICAL RESEARCH LETTERS Vol. 48 ( 1 ) 2021.1

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1029/2020GL089184

Web of Science
Global Bromine- and Iodine-Mediated Tropospheric Ozone Loss Estimated Using the CHASER Chemical Transport Model Reviewed

Sekiya Takashi, Kanaya Yugo, Sudo Kengo, Taketani Fumikazu, Iwamoto Yoko, Aita Maki N., Yamamoto Akitomo, Kawamoto Katsuhiro

SOLA Vol. 16 page： 220 - 227 2020.11

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.2151/sola.2020-037

Web of Science
Updated tropospheric chemistry reanalysis and emission estimates, TCR-2, for 2005-2018 Reviewed International coauthorship

Miyazaki Kazuyuki, Bowman Kevin, Sekiya Takashi, Eskes Henk, Boersma Folkert, Worden Helen, Livesey Nathaniel, Payne Vivienne H., Sudo Kengo, Kanaya Yugo, Takigawa Masayuki, Ogochi Koji

EARTH SYSTEM SCIENCE DATA Vol. 12 ( 3 ) page： 2223 - 2259 2020.9

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/essd-12-2223-2020

Web of Science
Projecting ozone hole recovery using an ensemble of chemistry-climate models weighted by model performance and independence Reviewed International coauthorship

Amos Matt, Young Paul J., Hosking J. Scott, Lamarque Jean-Francois, Abraham N. Luke, Akiyoshi Hideharu, Archibald Alexander T., Bekki Slimane, Deushi Makoto, Jockel Patrick, Kinnison Douglas, Kirner Ole, Kunze Markus, Marchand Marion, Plummer David A., Saint-Martin David, Sudo Kengo, Tilmes Simone, Yamashita Yousuke

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 20 ( 16 ) page： 9961 - 9977 2020.8

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/acp-20-9961-2020

Web of Science
A development of reduction scenarios of the short-lived climate pollutants (SLCPs) for mitigating global warming and environmental problems Reviewed

Nakajima Teruyuki, Ohara Toshimasa, Masui Toshihiko, Takemura Toshihiko, Yoshimura Kei, Goto Daisuke, Hanaoka Tatsuya, Itahashi Syuichi, Kurata Gakuji, Kurokawa Jun-ichi, Maki Takashi, Masutomi Yuji, Nakata Makiko, Nitta Tomoko, Seposo Xerxes, Sudo Kengo, Suzuki Chieko, Suzuki Kentaroh, Tsuruta Haruo, Ueda Kayo, Watanabe Shingo, Yu Yong, Yumimoto Keiya, Zhao Shuyun

PROGRESS IN EARTH AND PLANETARY SCIENCE Vol. 7 ( 1 ) 2020.7

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1186/s40645-020-00351-1

Web of Science
Model Inter-Comparison for PM2.5 Components over urban Areas in Japan in the J-STREAM Framework Reviewed

Yamaji Kazuyo, Chatani Satoru, Itahashi Syuichi, Saito Masahiko, Takigawa Masayuki, Morikawa Tazuko, Kanda Isao, Miya Yukako, Komatsu Hiroaki, Sakurai Tatsuya, Morino Yu, Kitayama Kyo, Nagashima Tatsuya, Shimadera Hikari, Uranishi Katsushige, Fujiwara Yuzuru, Hashimoto Tomoaki, Sudo Kengo, Misaki Takeshi, Hayami Hiroshi

ATMOSPHERE Vol. 11 ( 3 ) 2020.3

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.3390/atmos11030222

Web of Science
Evaluation of a multi-model, multi-constituent assimilation framework for tropospheric chemical reanalysis Reviewed International coauthorship

Miyazaki Kazuyuki, Bowman Kevin W., Yumimoto Keiya, Walker Thomas, Sudo Kengo

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 20 ( 2 ) page： 931 - 967 2020.1

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/acp-20-931-2020

Web of Science
Evaluation and uncertainty investigation of the NO2, CO and NH3 modeling over China under the framework of MICS-Asia III Reviewed International coauthorship

Kong Lei, Tang Xiao, Zhu Jiang, Wang Zifa, Fu Joshua S., Wang Xuemei, Itahashi Syuichi, Yamaji Kazuyo, Nagashima Tatsuya, Lee Hyo-Jung, Kim Cheol-Hee, Lin Chuan-Yao, Chen Lei, Zhang Meigen, Tao Zhining, Li Jie, Kajino Mizuo, Liao Hong, Wang Zhe, Sudo Kengo, Wang Yuesi, Pan Yuepeng, Tang Guiqian, Li Meng, Wu Qizhong, Ge Baozhu, Carmichael Gregory R.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 20 ( 1 ) page： 181 - 202 2020.1

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/acp-20-181-2020

Web of Science
Clear-sky ultraviolet radiation modelling using output from the Chemistry Climate Model Initiative Reviewed International coauthorship

Lamy Kevin, Portafaix Thierry, Josse Beatrice, Brogniez Colette, Godin-Beekmann Sophie, Bencherif Hassan, Revell Laura, Akiyoshi Hideharu, Bekki Slimane, Hegglin Michaela I, Joeckel Patrick, Kirner Oliver, Liley Ben, Marecal Virginie, Morgenstern Olaf, Stenke Andrea, Zeng Guang, Abraham N. Luke, Archibald Alexander T., Butchart Neil, Chipperfield Martyn P., Di Genova Glauco, Deushi Makoto, Dhomse Sandip S., Hu Rong-Ming, Kinnison Douglas, Kotkamp Michael, McKenzie Richard, Michou Martine, O'Connor Fiona M., Oman Luke D., Pitari Giovanni, Plummer David A., Pyle John A., Rozanov Eugene, Saint-Martin David, Sudo Kengo, Tanaka Taichu Y., Visioni Daniele, Yoshida Kohei

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 19 ( 15 ) page： 10087 - 10110 2019.8

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/acp-19-10087-2019

Web of Science
Description and basic evaluation of simulated mean state, internal variability, and climate sensitivity in MIROC6 Reviewed International coauthorship

Tatebe Hiroaki, Ogura Tomoo, Nitta Tomoko, Komuro Yoshiki, Ogochi Koji, Takemura Toshihiko, Sudo Kengo, Sekiguchi Miho, Abe Manabu, Saito Fuyuki, Chikira Minoru, Watanabe Shingo, Mori Masato, Hirota Nagio, Kawatani Yoshio, Mochizuki Takashi, Yoshimura Kei, Takata Kumiko, O'ishi Ryouta, Yamazaki Dai, Suzuki Tatsuo, Kurogi Masao, Kataoka Takahito, Watanabe Masahiro, Kimoto Masahide

GEOSCIENTIFIC MODEL DEVELOPMENT Vol. 12 ( 7 ) page： 2727 - 2765 2019.7

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/gmd-12-2727-2019

Web of Science
Seasonal features and origins of carbonaceous aerosols at Syowa Station, coastal Antarctica Reviewed

Hara Keiichiro, Sudo Kengo, Ohnishi Takato, Osada Kazuo, Yabuki Masanori, Shiobara Masataka, Yamanouchi Takashi

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 19 ( 11 ) page： 7817 - 7837 2019.6

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/acp-19-7817-2019

Web of Science
Ozone and carbon monoxide observations over open oceans on R/V Mirai from 67 degrees S to 75 degrees N during 2012 to 2017: testing global chemical reanalysis in terms of Arctic processes, low ozone levels at low latitudes, and pollution transport Reviewed International coauthorship

Kanaya Yugo, Miyazaki Kazuyuki, Taketani Fumikazu, Miyakawa Takuma, Takashima Hisahiro, Komazaki Yuichi, Pan Xiaole, Kato Saki, Sudo Kengo, Sekiya Takashi, Inoue Jun, Sato Kazutoshi, Oshima Kazuhiro

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 19 ( 11 ) page： 7233 - 7254 2019.6

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/acp-19-7233-2019

Web of Science
Evaluation of tropospheric ozone and ozone precursors in simulations from the HTAPII and CCMI model intercomparisons - a focus on the Indian subcontinent Reviewed International coauthorship

Hakim Zainab Q., Archer-Nicholls Scott, Beig Gufran, Folberth Gerd A., Sudo Kengo, Abraham Nathan Luke, Ghude Sachin, Henze Daven K., Archibald Alexander T.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 19 ( 9 ) page： 6437 - 6458 2019.5

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/acp-19-6437-2019

Web of Science
A new method (M(3)Fusion v1) for combining observations and multiple model output for an improved estimate of the global surface ozone distribution Reviewed International coauthorship

Chang Kai-Lan, Cooper Owen R., West J. Jason, Serre Marc L., Schultz Martin G., Lin Meiyun, Marecal Virginie, Josse Beatrice, Deushi Makoto, Sudo Kengo, Liu Junhua, Keller Christoph A.

GEOSCIENTIFIC MODEL DEVELOPMENT Vol. 12 ( 3 ) page： 955-978 2019.3

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/gmd-12-955-2019

Web of Science
Balance of Emission and Dynamical Controls on Ozone During the Korea-United States Air Quality Campaign From Multiconstituent Satellite Data Assimilation Reviewed International coauthorship

Miyazaki K., Sekiya T., Fu D., Bowman K. W., Kulawik S. S., Sudo K., Walker T., Kanaya Y., Takigawa M., Ogochi K., Eskes H., Boersma K. F., Thompson A. M., Gaubert B., Barre J., Emmons L. K.

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 124 ( 1 ) page： 387-413 2019.1

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1029/2018JD028912

Web of Science
Effect of global atmospheric aerosol emission change on PM2.5-related health impacts Reviewed International coauthorship

Seposo Xerxes, Ueda Kayo, Park Sang Seo, Sudo Kengo, Takemura Toshihiko, Nakajima Teruyuki

GLOBAL HEALTH ACTION Vol. 12 ( 1 ) 2019.1

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1080/16549716.2019.1664130

Web of Science
Quasi-Biennial Oscillations in Atmospheric Ozone from the Chemistry-Climate Model and Ozone Reanalysis Reviewed International coauthorship

Madhu, V. and K. Sudo

American Journal of Climate Change Vol. 8 page： 110-136 2019

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Authorship：Last author Language：English Publishing type：Research paper (scientific journal)

DOI： 10.4236/ajcc.2019.81007
Development of human health damage factors for PM2.5 based on a global chemical transport model Reviewed International coauthorship

Tang Longlong, Nagashima Tatsuya, Hasegawa Kouichi, Ohara Toshimasa, Sudo Kengo, Itsubo Norihiro

INTERNATIONAL JOURNAL OF LIFE CYCLE ASSESSMENT Vol. 23 ( 12 ) page： 2300-2310 2018.12

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1007/s11367-014-0837-8

Web of Science
Long-range transport impacts on surface aerosol concentrations and the contributions to haze events in China: an HTAP2 multi-model study Reviewed International coauthorship

Dong Xinyi, Fu Joshua S., Zhu Qingzhao, Sun Jian, Tan Jiani, Keating Terry, Sekiya Takashi, Sudo Kengo, Emmons Louisa, Tilmes Simone, Jonson Jan Eiof, Schulz Michael, Bian Huisheng, Chin Mian, Davila Yanko, Henze Daven, Takemura Toshihiko, Benedictow Anna Maria Katarina, Huang Kan

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 18 ( 21 ) page： 15581-15600 2018.10

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/acp-18-15581-2018

Web of Science
Estimates of the Global Burden of Ambient PM2.5, Ozone, and NO2 on Asthma Incidence and Emergency Room Visits Reviewed International coauthorship

Anenberg Susan C., Henze Daven K., Tinney Veronica, Kinney Patrick L., Raich William, Fann Neal, Malley Chris S., Roman Henry, Lamsal Lok, Duncan Bryan, Martin Randall V., van Donkelaar Aaron, Brauer Michael, Doherty Ruth, Jonson Jan Eiof, Davila Yanko, Sudo Kengo, Kuylenstierna Johan C. I.

ENVIRONMENTAL HEALTH PERSPECTIVES Vol. 126 ( 10 ) 2018.10

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1289/EHP3766

Web of Science
The effects of intercontinental emission sources on European air pollution levels

Jonson Jan Eiof, Schulz Michael, Emmons Louisa, Flemming Johannes, Henze Daven, Sudo Kengo, Lund Marianne Tronstad, Lin Meiyun, Benedictow Anna, Koffi Brigitte, Dentener Frank, Keating Terry, Kivi Rigel, Davila Yanko

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 18 ( 18 ) page： 13655 - 13672 2018.9

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Language：Japanese Publishing type：Research paper (scientific journal)

DOI： 10.5194/acp-18-13655-2018

Web of Science
Extremal dependence between temperature and ozone over the continental US Reviewed International coauthorship

Phalitnonkiat Pakawat, Hess Peter G. M., Grigoriu Mircea D., Samorodnitsky Gennady, Sun Wenxiu, Beaudry Ellie, Tilmes Simone, Deushi Makato, Josse Beatrice, Plummer David, Sudo Kengo

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 18 ( 16 ) page： 11927-11948 2018.8

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/acp-18-11927-2018

Web of Science
HTAP2 multi-model estimates of premature human mortality due to intercontinental transport of air pollution and emission sectors Reviewed International coauthorship

Liang Ciao-Kai, West J. Jason, Silva Raquel A., Bian Huisheng, Chin Mian, Davila Yanko, Dentener Frank J., Emmons Louisa, Flemming Johannes, Folberth Gerd, Henze Daven, Im Ulas, Jonson Jan Eiof, Keating Terry J., Kucsera Tom, Lenzen Allen, Lin Meiyun, Lund Marianne Tronstad, Pan Xiaohua, Park Rokjin J., Pierce R. Bradley, Sekiya Takashi, Sudo Kengo, Takemura Toshihiko

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 18 ( 14 ) page： 10497-10520 2018.7

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/acp-18-10497-2018

Web of Science
Two-scale multi-model ensemble: is a hybrid ensemble of opportunity telling us more?

Galmarini Stefano, Kioutsioukis Ioannis, Solazzo Efisio, Alyuz Ummugulsum, Balzarini Alessandra, Bellasio Roberto, Benedictow Anna M. K., Bianconi Roberto, Bieser Johannes, Brandt Joergen, Christensen Jesper H., Colette Augustin, Curci Gabriele, Davila Yanko, Dong Xinyi, Flemming Johannes, Francis Xavier, Fraser Andrea, Fu Joshua, Henze Daven K., Hogrefe Christian, Im Ulas, Garcia Vivanco Marta, Jimenez-Guerrero Pedro, Jonson Jan Eiof, Kitwiroon Nutthida, Manders Astrid, Mathur Rohit, Palacios-Pena Laura, Pirovano Guido, Pozzoli Luca, Prank Marie, Schultz Martin, Sokhi Rajeet S., Sudo Kengo, Tuccella Paolo, Takemura Toshihiko, Sekiya Takashi, Unal Alper

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 18 ( 12 ) page： 8727 - 8744 2018.6

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Language：Japanese Publishing type：Research paper (scientific journal)

DOI： 10.5194/acp-18-8727-2018

Web of Science
Estimates of ozone return dates from Chemistry-Climate Model Initiative simulations Reviewed International coauthorship

Dhomse Sandip S., Kinnison Douglas, Chipperfield Martyn P., Salawitch Ross J., Cionni Irene, Hegglin Michaela I., Abraham N. Luke, Akiyoshi Hideharu, Archibald Alex T., Bednarz Ewa M., Bekki Slimane, Braesicke Peter, Butchart Neal, Dameris Martin, Deushi Makoto, Frith Stacey, Hardiman Steven C., Hassler Birgit, Horowitz LarryW., Hu Rong-Ming, Joeckel Patrick, Josse Beatrice, Kirner Oliver, Kremser Stefanie, Langematz Ulrike, Lewis Jared, Marchand Marion, Lin Meiyun, Mancini Eva, Marecal Virginie, Michou Martine, Morgenstern Olaf, O'Connor Fiona M., Oman Luke, Pitari Giovanni, Plummer David A., Pyle John A., Revell Laura E., Rozanov Eugene, Schofield Robyn, Stenke Andrea, Stone Kane, Sudo Kengo, Tilmes Simone, Visioni Daniele, Yamashita Yousuke, Zeng Guang

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 18 ( 11 ) page： 8409-8438 2018.6

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/acp-18-8409-2018

Web of Science
Multi-model study of HTAP II on sulfur and nitrogen deposition Reviewed International coauthorship

Tan Jiani, Fu Joshua S., Dentener Frank, Sun Jian, Emmons Louisa, Tilmes Simone, Sudo Kengo, Flemming Johannes, Jonson Jan Eiof, Gravel Sylvie, Bian Huisheng, Davila Yanko, Henze Daven K., Lund Marianne T., Kucsera Tom, Takemura Toshihiko, Keating Terry

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 18 ( 9 ) page： 6847-6866 2018.5

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/acp-18-6847-2018

Web of Science
Global high-resolution simulations of tropospheric nitrogen dioxide using CHASER V4.0 Reviewed

Sekiya Takashi, Miyazaki Kazuyuki, Ogochi Koji, Sudo Kengo, Takigawa Masayuki

GEOSCIENTIFIC MODEL DEVELOPMENT Vol. 11 ( 3 ) page： 959-988 2018.3

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Authorship：Last author Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/gmd-11-959-2018

Web of Science
Ozone sensitivity to varying greenhouse gases and ozone-depleting substances in CCMI-1 simulations Reviewed International coauthorship

Morgenstern Olaf, Stone Kane A., Schofield Robyn, Akiyoshi Hideharu, Yamashita Yousuke, Kinnison Douglas E., Garcia Rolando R., Sudo Kengo, Plummer David A., Scinocca John, Oman Luke D., Manyin Michael E., Zeng Guang, Rozanov Eugene, Stenke Andrea, Revell Laura E., Pitari Giovanni, Mancini Eva, Di Genova Glauco, Visioni Daniele, Dhomse Sandip S., Chipperfield Martyn P.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 18 ( 2 ) page： 1091-1114 2018.1

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/acp-18-1091-2018

Web of Science
Investigation of global particulate nitrate from the AeroCom phase III experiment Reviewed International coauthorship

Bian Huisheng, Chin Mian, Hauglustaine Didier A., Schulz Michael, Myhre Gunnar, Bauer Susanne E., Lund Marianne T., Karydis Vlassis A., Kucsera Tom L., Pan Xiaohua, Pozzer Andrea, Skeie Ragnhild B., Steenrod Stephen D., Sudo Kengo, Tsigaridis Kostas, Tsimpidi Alexandra P., Tsyro Svetlana G.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 17 ( 21 ) page： 12911-12940 2017.11

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.5194/acp-17-12911-2017

Web of Science
Formaldehyde in the Tropical Western Pacific: Chemical Sources and Sinks, Convective Transport, and Representation in CAM-Chem and the CCMI Models Reviewed International coauthorship

Anderson Daniel C., Nicely Julie M., Wolfe Glenn M., Hanisco Thomas F., Salawitch Ross J., Canty Timothy P., Dickerson Russell R., Apel Eric C., Baidar Sunil, Bannan Thomas J., Blake Nicola J., Chen Dexian, Dix Barbara, Fernandez Rafael P., Hall Samuel R., Hornbrook Rebecca S., Huey L. Gregory, Josse Beatrice, Joeckel Patrick, Kinnison Douglas E., Koenig Theodore K., Le Breton Michael, Marecal Virginie, Morgenstern Olaf, Oman Luke D., Pan Laura L., Percival Carl, Plummer David, Revell Laura E., Rozanov Eugene, Saiz-Lopez Alfonso, Stenke Andrea, Sudo Kengo, Tilmes Simone, Ullmann Kirk, Volkamer Rainer, Weinheimer Andrew J., Zeng Guang

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 122 ( 20 ) page： 11201-11226 2017.10

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1002/2016JD026121

Web of Science
Future global mortality from changes in air pollution attributable to climate change Reviewed International coauthorship

Silva Raquel A., West J. Jason, Lamarque Jean-Francois, Shindell Drew T., Collins William J., Faluvegi Greg, Folberth Gerd A., Horowitz Larry W., Nagashima Tatsuya, Naik Vaishali, Rumbold Steven T., Sudo Kengo, Takemura Toshihiko, Bergmann Daniel, Cameron-Smith Philip, Doherty Ruth M., Josse Beatrice, MacKenzie Ian A., Stevenson David S., Zeng Guang

NATURE CLIMATE CHANGE Vol. 7 ( 9 ) page： 647-+ 2017.9

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1038/NCLIMATE3354

Web of Science
Long-term change in the source contribution to surface ozone over Japan Reviewed

Nagashima Tatsuya, Sudo Kengo, Akimoto Hajime, Kurokawa Junichi, Ohara Toshimasa

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 17 ( 13 ) page： 8231-8246 2017.7

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DOI： 10.5194/acp-17-8231-2017

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Impact of intercontinental pollution transport on North American ozone air pollution: an HTAP phase 2 multi-model study Reviewed International coauthorship

Huang Min, Carmichael Gregory R., Pierce R. Bradley, Jo Duseong S., Park Rokjin J., Flemming Johannes, Emmons Louisa K., Bowman Kevin W., Henze Daven K., Davila Yanko, Sudo Kengo, Jonson Jan Eiof, Lund Marianne Tronstad, Janssens-Maenhout Greet, Dentener Frank J., Keating Terry J., Oetjen Hilke, Payne Vivienne H.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 17 ( 9 ) page： 5721-5750 2017.5

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DOI： 10.5194/acp-17-5721-2017

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Evaluation of summertime surface ozone in Kanto area of Japan using a semi-regional model and observation Reviewed International coauthorship

Tran Thi Ngoc Trieu, Goto Daisuke, Yashiro Hisashi, Murata Ryo, Sudo Kengo, Tomita Hirofumi, Satoh Masaki, Nakajima Teruyuki

ATMOSPHERIC ENVIRONMENT Vol. 153 page： 163-181 2017.3

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DOI： 10.1016/j.atmosenv.2017.01.030

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Review of the global models used within phase 1 of the Chemistry-Climate Model Initiative (CCMI) Reviewed International coauthorship

Morgenstern Olaf, Hegglin Michaela I., Rozanov Eugene, O'Connor Fiona M., Abraham N. Luke, Akiyoshi Hideharu, Archibald Alexander T., Bekki Slimane, Butchart Neal, Chipperfield Martyn P., Deushi Makoto, Dhomse Sandip S., Garcia Rolando R., Hardiman Steven C., Horowitz Larry W., Joeckel Patrick, Josse Beatrice, Kinnison Douglas, Lin Meiyun, Mancini Eva, Manyin Michael E., Marchand Marion, Marecal Virginie, Michou Martine, Oman Luke D., Pitari Giovanni, Plummer David A., Revell Laura E., Saint-Martin David, Schofield Robyn, Stenke Andrea, Stone Kane, Sudo Kengo, Tanaka Taichu Y., Tilmes Simone, Yamashita Yousuke, Yoshida Kohei, Zeng Guang

GEOSCIENTIFIC MODEL DEVELOPMENT Vol. 10 ( 2 ) page： 639-671 2017.2

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DOI： 10.5194/gmd-10-639-2017

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Decadal changes in global surface NOx emissions from multi-constituent satellite data assimilation Reviewed International coauthorship

Miyazaki Kazuyuki, Eskes Henk, Sudo Kengo, Boersma K. Folkert, Bowman Kevin, Kanaya Yugo

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 17 ( 2 ) page： 807-837 2017.1

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DOI： 10.5194/acp-17-807-2017

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Decadal changes in global surface NOx emissions from multi-constituent satellite data assimilation, Reviewed International coauthorship

Miyazaki, K., Eskes, H., Sudo, K., Boersma, K. F., Bowman, K., and Kanaya Y.

Atmos. Chem. Phys. Vol. 17 page： 807-837 2017

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DOI： doi:10.5194/acp-17-807-2017
Estimates of Ozone Return Dates from Chemistry-Climate Model Initiative Simulations Reviewed International coauthorship

Dhomse, S., Kinnison, D., Chipperfield, M. P., Cionni, I., Hegglin, M., Abraham, N. L., Akiyoshi, H., Archibald, A. T., Bednarz, E. M., Bekki, S., Braesicke, P., Butchart, N., Dameris, M., Deushi, M., Frith, S., Hardiman, S. C., Hassler, B., Horowitz, L. W., Hu, R.-M., Jöckel, P., Josse, B., Kirner, O., Kremser, S., Langematz, U., Lewis, J., Marchand, M., Lin, M., Mancini, E., Marécal, V., Michou, M., Morgenstern, O., O'Connor, F. M., Oman, L., Pitari, G., Plummer, D. A., Pyle, J. A., Revell, L. E., Rozanov, E., Schofield, R., Stenke, A., Stone, K., Sudo, K., Tilmes, S., Visioni, D., Yamashita, Y., and Zeng, G.

Atmos. Chem. Phys. Disscus. Vol. 17 2017

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DOI： doi.org/10.5194/acp-2018-87
Investigation of global particulate nitrate from the AeroCom phase III experiment Reviewed International coauthorship

Bian, H., Chin, M., Hauglustaine, D. A., Schulz, M., Myhre, G., Bauer, S. E., Lund, M. T., Karydis, V. A., Kucsera, T. L., Pan, X., Pozzer, A., Skeie, R. B., Steenrod, S. D., Sudo, K., Tsigaridis, K., Tsimpidi, A. P., and Tsyro, S. G

Atmos. Chem. Phys. Vol. 17 page： 12911-12940 2017

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DOI： doi.org/10.5194/acp-17-12911-2017
Formaldehyde in the Tropical Western Pacific: Chemical Sources and Sinks, Convective Transport, and Representation in CAM-Chem and the CCMI Models Reviewed International coauthorship

Anderson, D. C., J. M. Nicely, G. M. Wolfe, T. F. Hanisco, R. J. Salawitch, T. P. Canty, R. R. Dickerson, E. C. Apel, S. Baidar, T. J. Bannan, N. J. Blake, D. X. Chen, B. Dix, R. P. Fernandez, S. R. Hall, R. S. Hornbrook, L. G. Huey, B. Josse, P. Jockel, D. E. Kinnison, T. K. Koenig, M. Le Breton, V. Marecal, O. Morgenstern, L. D. Oman, L. L. Pan, C. Percival, D. Plummer, L. E. Revell, E. Rozanov, A. Saiz-Lopez, A. Stenke, K. Sudo, S. Tilmes, K. Ullmann, R. Volkamer, A. J. Weinheimer and G. Zeng

J. Geophs. Res.-Atmos. Vol. 122 ( 20 ) page： 11201-11226 2017

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DOI： 10.1002/2016jd026121
Future global mortality from changes in air pollution attributable to climate change Reviewed International coauthorship

Silva, R. A., J. J. West, J. F. Lamarque, D. T. Shindell, W. J. Collins, G. Faluvegi, G. A. Folberth, L. W. Horowitz, T. Nagashima, V. Naik, S. T. Rumbold, K. Sudo, T. Takemura, D. Bergmann, P. Cameron-Smith, R. M. Doherty, B. Josse, I. A. MacKenzie, D. S. Stevenson and G. Zeng

Nat. Clim. Change Vol. 7 ( 11 ) page： 845-845 2017

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DOI： 10.1038/Nclimate3427
化学気候モデルで探る大気微量成分の全球変動 Reviewed

須藤健悟

大気化学研究 Vol. 36 page： 036A03 2017

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Long-term change in the contributions of various source regions to surface ozone over Japan Reviewed

Nagashima, T., Sudo K., Akimoto, H., Kurokawa, J., and Ohara, T.

Atmos. Chem. Phys. Vol. 17 page： 8231-8246 2017

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DOI： doi.org/10.5194/acp-17-8231-2017
Review of the global models used within the Chemistry-Climate Model Initiative (CCMI) Reviewed International coauthorship

Morgenstern, O., Hegglin, M. I., Rozanov, E., O'Connor, F. M., Abraham, N. L., Akiyoshi, H., Archibald, A. T., Bekki, S., Butchart, N., Chipperfield, M. P., Deushi, M., Dhomse, S. S., Garcia, R. R., Hardiman, S. C., Horowitz, L. W., Jöckel, P., Josse, B., Kinnison, D., Lin, M., Mancini, E., Manyin, M. E., Marchand, M., Marécal, V., Michou, M., Oman, L. D., Pitari, G., Plummer, D. A., Revell, L. E., Saint-Martin, D., Schofield, R., Stenke, A., Stone, Sudo K., K., Tanaka, T. Y., Tilmes, S., Yamashita, Y., Yoshida, K., and Zeng, G.

Geosci. Model Dev. Vol. 10 page： 639-671 2017

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DOI： doi:10.5194/gmd-10-639-2017
Impact of Intercontinental Pollution Transport on North American Ozone Air Pollution: An HTAP Phase II Multi-model Study Reviewed International coauthorship

Huang, M., Carmichael, G. R., Pierce, R. B., Jo, D. S., Park, R. J., Flemming, J., Emmons, L. K., Bowman, K. W., Henze, D. K., Davila, Y., Sudo K., Jonson, J. E., Lund, M. T., Janssens-Maenhout, G., Dentener, F. J., Keating, T. J., Oetjen, H., and Payne, V. H.

Atmos. Chem. Phys. Vol. 17 page： 5721-5750 2017

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DOI： doi:10.5194/acp-17-5721-2017.
Evaluation of summertime surface ozone in Kanto area of Japan using a semi-regional model and observation Reviewed International coauthorship

Trieu, TTN, D. Goto, H. Yashiro, R. Murata, K. Sudo, H. Tomita, M. Satoh, T. Nakajima

Atmos. Environ. Vol. 153 page： 163-181 2017

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Global and regional radiative forcing from 20% reductions in BC, OC and SO4 - an HTAP2 multi-model study Reviewed International coauthorship

Stjern Camilla Weum, Samset Bjorn Hallvard, Myhre Gunnar, Bian Huisheng, Chin Mian, Davila Yanko, Dentener Frank, Emmons Louisa, Flemming Johannes, Haslerud Amund Sovde, Henze Daven, Jonson Jan Eiof, Kucsera Tom, Lund Marianne Tronstad, Schulz Michael, Sudo Kengo, Takemura Toshihiko, Tilmes Simone

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 16 ( 21 ) page： 13579-13599 2016.11

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DOI： 10.5194/acp-16-13579-2016

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The effect of future ambient air pollution on human premature mortality to 2100 using output from the ACCMIP model ensemble Reviewed International coauthorship

Silva Raquel A., West J. Jason, Lamarque Jean-Francois, Shindell Drew T., Collins William J., Dalsoren Stig, Faluvegi Greg, Folberth Gerd, Horowitz Larry W., Nagashima Tatsuya, Naik Vaishali, Rumbold Steven T., Sudo Kengo, Takemura Toshihiko, Bergmann Daniel, Cameron-Smith Philip, Cionni Irene, Doherty Ruth M., Eyring Veronika, Josse Beatrice, MacKenzie Ian A., Plummer David, Righi Mattia, Stevenson David S., Strode Sarah, Szopa Sophie, Zengast Guang

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 16 ( 15 ) page： 9847-9862 2016.8

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DOI： 10.5194/acp-16-9847-2016

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WHERE ARE THE LOW-MASS POPULATION III STARS? Reviewed

Ishiyama Tomoaki, Sudo Kae, Yokoi Shingo, Hasegawa Kenji, Tominaga Nozomu, Susa Hajime

ASTROPHYSICAL JOURNAL Vol. 826 ( 1 ) 2016.7

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DOI： 10.3847/0004-637X/826/1/9

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Evaluating ethane and methane emissions associated with the development of oil and natural gas extraction in North America Reviewed International coauthorship

Franco B., Mahieu E., Emmons L. K., Tzompa-Sosa Z. A., Fischer E. V., Sudo K., Bovy B., Conway S., Griffin D., Hannigan J. W., Strong K., Walker K. A.

ENVIRONMENTAL RESEARCH LETTERS Vol. 11 ( 4 ) 2016.4

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DOI： 10.1088/1748-9326/11/4/044010

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Evolution of stratospheric sulfate aerosol from the 1991 Pinatubo eruption: Roles of aerosol microphysical processes Reviewed

Sekiya T., Sudo K., Nagai T.

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 121 ( 6 ) page： 2911-2938 2016.3

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DOI： 10.1002/2015JD024313

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Evaluating ethane and methane emissions associated with the development of oil and natural gas extraction in North America Reviewed

Franco, B., E Mahieu, L K Emmons, Z A Tzompa-Sosa, E V Fischer, K Sudo, B Bovy, S Conway, D Griffin, J W Hannigan, K Strong, K A Walker

Environ., Res., Lett., Vol. 11 ( 044010 ) 2016

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DOI： doi:10.1088/1748-9326/11/4/044010
Global and regional radiative forcing from 20% reductions in BC, OC and SO4 - an HTAP2 multi-model study Reviewed

Stjern, C. W., Samset, B. H., Myhre, G., Bian, H., Chin, M., Davila, Y., Dentener, F., Emmons, L., Flemming, J., Haslerud, A. S., Henze, D., Jonson, J. E., Kucsera, T., Lund, M. T., Schulz, M., Sudo, K., Takemura, T., and Tilmes, S.

Atmos. Chem. Phys. Vol. 16 page： 13579-13599 2016

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DOI： doi:10.5194/acp-16-13579-2016
Evolution of stratospheric sulfate aerosol from the 1991 Pinatubo eruption: Roles of aerosol microphysical processes Reviewed

Sekiya, T., K. Sudo, and. T. Nagai

J. Geophys. Res. Atmos. 2016

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DOI： doi:10.1002/2015jd024313
The effect of future ambient air pollution on human premature mortality to 2100 using output from the ACCMIP model ensemble Reviewed

Silva, R. A., West, J. J., Lamarque, J.-F., Shindell, D. T., Collins, W. J., Dalsoren, S., Faluvegi, G., Folberth, G., Horowitz, L. W., Nagashima, T., Naik, V., Rumbold, S. T., Sudo, K., Takemura, T., Bergmann, D., Cameron-Smith, P., Cionni, I., Doherty, R. M., Eyring, V., Josse, B., MacKenzie, I. A., Plummer, D. S., Righi, M., Stevenson, D. S., Strode, S., Szopa, S., and Zeng, G.

Atmos. Chem. Phys. Vol. 16 page： 9847-9862 2016

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DOI： doi:10.5194/acp-16-9847-2016
SLCP co-control approach in East Asia: Tropospheric ozone reduction strategy by simultaneous reduction of NOx/NMVOC and methane Reviewed

Akimoto Hajime, Kurokawa Jun'ichi, Sudo Kengo, Nagashima Tatsuya, Takemura Toshihiko, Klimont Zbigniew, Amann Markus, Suzuki Katsunori

ATMOSPHERIC ENVIRONMENT Vol. 122 page： 588-595 2015.12

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DOI： 10.1016/j.atmosenv.2015.10.003

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Development of human health damage factors for tropospheric ozone considering transboundary transport on a global scale Reviewed

Tang, L., Nagashima, T., Hasegawa, K., Ohara, T., Sudo, K., and Itsubo, N.

Int. J. Life Cycle Assess. 2015

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DOI： 10.1007/s11367-015-1001-9
SLCP co-control approach in East Asia: Tropospheric ozone reduction strategy by simultaneous reduction of NOx/NMVOC and methane Reviewed

Akimoto, H., J. Kurokawa, K. Sudo, T. Nagashima, T. Takemura, Z. Klimont, M. Amann, K. Suzuki

Atmos. Environ. Vol. 122 page： 588-595 2015

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DOI： doi:10.1016/j.atmosenv.2015.10.003
A tropospheric chemistry reanalysis for the years 2005-2012 based on an assimilation of OMI, MLS, TES and MOPITT satellite data Reviewed

Miyazaki,K., H. J. Eskes, and K. Sudo

Atmos. Chem. Phys. Vol. 15 page： 8315-8348 2015

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Use of North American and European air quality networks to evaluate global chemistry-climate modeling of surface ozone Reviewed

Schnell,J.L., M. J. Prather, B. Josse, V. Naik, L. W. Horowitz, P. Cameron-Smith, D. Bergmann, G. Zeng, D. A. Plummer, K. Sudo, T. Nagashima, D. T. Shindell, G. Faluvegi, and S. A. Strode

Atmos. Chem. Phys. Vol. 15 page： 10581-10596 2015

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DOI： doi:10.5194/acp-15-10581-2015
Retrieval of ethane from ground-based FTIR solar spectra using improved spectroscopy: Recent burden increase above Jungfraujoch Reviewed

Franco, B., Bader, W., Toon, G. C., Bray, C., Perrin, A., Fischer, E. V., Sudo, K., Boone, C. D., Bovy, B., Lejeune, B., Servais, C., and Mahieu, E.

J. Quant. Spectrosc. Ra. Vol. 160 page： 36-49 2015

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DOI： 10.1016/j.jqsrt.2015.03.017
Development of human health damage factors for PM2.5 based on a global chemical transport model Reviewed

Tang, L., Nagashima, T., Hasegawa, K., Ohara, T., Sudo, K., and Itsubo, N.

Int. J. Life Cycle Assess. 2015

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DOI： 10.1007/s11367-014-0837-8.
A tropospheric chemistry reanalysis for the years 2005-2012 based on an assimilation of OMI, MLS, TES, and MOPITT satellite data Reviewed

Miyazaki K., Eskes H. J., Sudo K.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 15 ( 14 ) page： 8315-8348 2015

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DOI： 10.5194/acp-15-8315-2015

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Use of North American and European air quality networks to evaluate global chemistry-climate modeling of surface ozone Reviewed

Schnell J. L., Prather M. J., Josse B., Naik V., Horowitz L. W., Cameron-Smith P., Bergmann D., Zeng G., Plummer D. A., Sudo K., Nagashima T., Shindell D. T., Faluvegi G., Strode S. A.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 15 ( 18 ) page： 10581-10596 2015

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DOI： 10.5194/acp-15-10581-2015

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Roles of transport and chemistry processes in global ozone change on interannual and multidecadal time scales Reviewed

Sekiya T., Sudo K.

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 119 ( 8 ) page： 4903-4921 2014.4

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DOI： 10.1002/2013JD020838

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地球温暖化第４講大気汚染と地球温暖化 Invited Reviewed

須藤健悟

大気環境学会誌 Vol. 49 ( 2 ) page： A25-A35 2014.1

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アジア域では、土地利用変化などに伴う植生改変およびエアロゾルの増加が顕著であり、これらの変動は陸面過程、大気放射、および雲・降水を変化させ、アジアモンスーンなどのアジア域気候に影響している可能性が大きい。本研究では、植生改変とエアロゾル変動の役割という観点から、総合的に気候影響を検討している。本論文では、特に、農地化などの土地利用変化が、陸面、および硝酸塩や植生起源有機炭素などのエアロゾル成分の変動を通じて、どのように気候に影響するかについて、全球化学・エアロゾル気候モデルを用いた最新の結果について紹介する。
Roles of transport and chemistry processes in global ozone change on interannual and multidecadal time scales Reviewed

Sekiya, T. and K. Sudo

J. Geophys. Res. Vol. 119 ( 8 ) page： 4903-4921 2014

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Long-term MAX-DOAS network observations of NO2 in Russia and Asia (MADRAS) during the period 2007-2012: instrumentation, elucidation of climatology, and comparisons with OMI satellite observations and global model simulations Reviewed

Kanaya, Y., H. Irie, H. Takashima, H. Iwabuchi, H. Akimoto, K. Sudo, M. Gu, J. Chong, Y. J. Kim, H. Lee, A. Li, F. Si, J. Xu, P.-H. Xie, W.-Q. Liu, A. Dzhola, O. Postylyakov, V. Ivanov, E. Grechko, S. Terpugova, and M. Panchenko

Atmos. Chem. Phys. Vol. 14 page： 7909-7927 2014

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Global lightning NOx production estimated by an assimilation of multiple satellite data sets Reviewed

Miyazaki, K., H. J. Eskes, K. Sudo, and C. Zhang

Atmos. Chem. Phys. Vol. 14 page： 3277-3305. 2014

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Global lightning NOx production estimated by an assimilation of multiple satellite data sets Reviewed International coauthorship

Miyazaki K., Eskes H. J., Sudo K., Zhang C.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 14 ( 7 ) page： 3277-3305 2014

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DOI： 10.5194/acp-14-3277-2014

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Long-term MAX-DOAS network observations of NO2 in Russia and Asia (MADRAS) during the period 2007-2012: instrumentation, elucidation of climatology, and comparisons with OMI satellite observations and global model simulations Reviewed International coauthorship

Kanaya Y., Irie H., Takashima H., Iwabuchi H., Akimoto H., Sudo K., Gu M., Chong J., Kim Y. J., Lee H., Li A., Si F., Xu J., Xie P. -H., Liu W. -Q., Dzhola A., Postylyakov O., Ivanov V., Grechko E., Terpugova S., Panchenko M.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 14 ( 15 ) page： 7909-7927 2014

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DOI： 10.5194/acp-14-7909-2014

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Three decades of global methane sources and sinks Reviewed

Kirschke Stefanie, Bousquet Philippe, Ciais Philippe, Saunois Marielle, Canadell Josep G., Dlugokencky Edward J., Bergamaschi Peter, Bergmann Daniel, Blake Donald R., Bruhwiler Lori, Cameron-Smith Philip, Castaldi Simona, Chevallier Frederic, Feng Liang, Fraser Annemarie, Heimann Martin, Hodson Elke L., Houweling Sander, Josse Beatrice, Fraser Paul J., Krummel Paul B., Lamarque Jean-Francois, Langenfelds Ray L., Le Quere Corinne, Naik Vaishali, O'Doherty Simon, Palmer Paul I., Pison Isabelle, Plummer David, Poulter Benjamin, Prinn Ronald G., Rigby Matt, Ringeval Bruno, Santini Monia, Schmidt Martina, Shindell Drew T., Simpson Isobel J., Spahni Renato, Steele L. Paul, Strode Sarah A., Sudo Kengo, Szopa Sophie, van der Werf Guido R., Voulgarakis Apostolos, van Weele Michiel, Weiss Ray F., Williams Jason E., Zeng Guang

NATURE GEOSCIENCE Vol. 6 ( 10 ) page： 813-823 2013.10

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DOI： 10.1038/NGEO1955

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Long-term ozone changes and associated climate impacts in CMIP5 simulations Reviewed

Eyring V., Arblaster J. M., Cionni I., Sedlacek J., Perliwitz J., Young P. J., Bekki S., Bergmann D., Cameron-Smith P., Collins W. J., Faluvegi G., Gottschaldt K. D., Horowitz L. W., Kinnison D. E., Lamarque J. F., Marsh D. R., Saint-Martin D., Shindell D. T., Sudo K., Szopa S., Watanabe S.

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 118 ( 10 ) page： 5029-5060 2013.5

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DOI： 10.1002/jgrd.50316

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Evaluation of preindustrial to present-day black carbon and its albedo forcing from Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP) Reviewed

Lee,Y. H., J.-F. Lamarque, M. G. Flanner, K. Sudo, et al.

Atmos. Chem. Phys. Vol. 13 ( 5 ) page： 2607-2634 2013.1

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Three decades of global methane sources and sinks Reviewed

Kirschke, S., P. Bousquet, P. Ciais, K. Sudo, et al.

Nature Geosci., Vol. 6 ( 10 ) page： 813–823 2013.1

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DOI： doi:10.1038/ngeo1955.
Preindustrial to present-day changes in tropospheric hydroxyl radical and methane lifetime from the Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP) Reviewed

Naik, V., Voulgarakis, A., Fiore, A. M., K. Sudo, et al.

Atmos. Chem. Phys. Vol. 13 ( 5 ) page： 5277-5298 2013.1

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DOI： doi:10.5194/acp-13-5277-2013
Evaluation of ACCMIP outgoing longwave radiation from tropospheric ozone using TES satellite observations Reviewed

Bowman, K. W., Shindell, D. T., Worden, H. M., Sudo K., et al.

Atmos. Chem. Phys. Vol. 13 ( 5 ) page： 4057-4072 2013.1

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DOI： doi:10.5194/acp-13-4057-2013
Tropospheric ozone changes, radiative forcing and attribution to emissions in the Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP) Reviewed

Stevenson, D. S., Young, P. J., Naik, V., K. Sudo, et al.

Atmos. Chem. Phys. Vol. 13 ( 5 ) page： 3063-3085 2013.1

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DOI： doi:10.5194/acp-13-3063-2013
Radiative forcing in the ACCMIP historical and future climate simulations Reviewed

Shindell, D. T., Lamarque, J.-F., Schulz, M., K. Sudo, et al.

Atmos. Chem. Phys. Vol. 13 ( 5 ) page： 2939-2974 2013.1

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DOI： doi:10.5194/acp-13-2939-2013
Global premature mortality due to anthropogenic outdoor air pollution and the contribution of past climate change Reviewed

Silva, R. A., J. J. West, Y. Q. Zhang, S. C. Anenberg, J. F. Lamarque, D. T. Shindell, W. J. Collins, S. Dalsoren, G. Faluvegi, G. Folberth, L. W. Horowitz, T. Nagashima, V. Naik, S. Rumbold, R. Skeie, K. Sudo, T. Takemura, D. Bergmann, P. Cameron-Smith, I. Cionni, R. M. Doherty, V. Eyring, B. Josse, I. A. MacKenzie, D. Plummer, M. Righi, D. S. Stevenson, S. Strode, S. Szopa and G. Zeng

Environmental Research Letters Vol. 8 ( 3 ) 2013.1

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DOI： doi:10.1088/1748-9326/8/3/034005.
Analysis of present day and future OH and methane lifetime in the ACCMIP simulations Reviewed

Voulgarakis, A., V. Naik, J.-F. Lamarque, D. T. Shindell, K. Sudo, et al.

Atmos. Chem. Phys. Vol. 13 ( 5 ) page： 2563-2587 2013.1

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Pre-industrial to end 21st century projections of tropospheric ozone from the Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP) Reviewed

Young, P. J., A. T. Archibald, K. W. Bowman, J.-F. Lamarque, K. Sudo, et al.

Atmos. Chem. Phys. Vol. 13 ( 5 ) page： 2063-2090 2013.1

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The Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP): overview and description of models, simulations and climate diagnostics Reviewed

J.-F. Lamarque, D. T. Shindell, B. Josse, P. J. Young, K. Sudo, et al.

Geosci. Model Dev. Vol. 6 page： 179-206. 2013.1

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Long-term ozone changes and associated climate impacts in CMIP5 simulations Reviewed

Eyring, V., J. M. Arblaster, I. Cionni, K. Sudo, et al.

J. Geophys. Res. Atmos. Vol. 118 page： 5029–5060 2013.1

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DOI： doi:10.1002/jgrd.50316
Evaluation of ACCMIP outgoing longwave radiation from tropospheric ozone using TES satellite observations Reviewed

Bowman K. W., Shindell D. T., Worden H. M., Lamarque J. F., Young P. J., Stevenson D. S., Qu Z., de la Torre M., Bergmann D., Cameron-Smith P. J., Collins W. J., Doherty R., Dalsoren S. B., Faluvegi G., Folberth G., Horowitz L. W., Josse B. M., Lee Y. H., MacKenzie I. A., Myhre G., Nagashima T., Naik V., Plummer D. A., Rumbold S. T., Skeie R. B., Strode S. A., Sudo K., Szopa S., Voulgarakis A., Zeng G., Kulawik S. S., Aghedo A. M., Worden J. R.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 13 ( 8 ) page： 4057-4072 2013

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DOI： 10.5194/acp-13-4057-2013

Web of Science
Evaluation of preindustrial to present-day black carbon and its albedo forcing from Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP) (vol 13, pg 2607, 2013) Reviewed

Lee Y. H., Lamarque J. -F., Flanner M. G., Jiao C., Shindell D. T., Berntsen T., Bisiaux M. M., Cao J., Collins W. J., Curran M., Edwards R., Faluvegi G., Ghan S., Horowitz L. W., McConnell J. R., Ming J., Myhre G., Nagashima T., Naik V., Rumbold S. T., Skeie R. B., Sudo K., Takemura T., Thevenon F., Xu B., Yoon J-H

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 13 ( 13 ) page： 6553-6554 2013

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DOI： 10.5194/acp-13-6553-2013

Web of Science
Evaluation of preindustrial to present-day black carbon and its albedo forcing from Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP) Reviewed

Lee Y. H., Lamarque J. -F., Flanner M. G., Jiao C., Shindell D. T., Berntsen T., Bisiaux M. M., Cao J., Collins W. J., Curran M., Edwards R., Faluvegi G., Ghan S., Horowitz L. W., McConnell J. R., Ming J., Myhre G., Nagashima T., Naik V., Rumbold S. T., Skeie R. B., Sudo K., Takemura T., Thevenon F., Xu B., Yoon J. -H.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 13 ( 5 ) page： 2607-2634 2013

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DOI： 10.5194/acp-13-2607-2013

Web of Science
Global premature mortality due to anthropogenic outdoor air pollution and the contribution of past climate change Reviewed

Silva Raquel A., West J. Jason, Zhang Yuqiang, Anenberg Susan C., Lamarque Jean-Francois, Shindell Drew T., Collins William J., Dalsoren Stig, Faluvegi Greg, Folberth Gerd, Horowitz Larry W., Nagashima Tatsuya, Naik Vaishali, Rumbold Steven, Skeie Ragnhild, Sudo Kengo, Takemura Toshihiko, Bergmann Daniel, Cameron-Smith Philip, Cionni Irene, Doherty Ruth M., Eyring Veronika, Josse Beatrice, MacKenzie I. A., Plummer David, Righi Mattia, Stevenson David S., Strode Sarah, Szopa Sophie, Zeng Guang

ENVIRONMENTAL RESEARCH LETTERS Vol. 8 ( 3 ) 2013

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DOI： 10.1088/1748-9326/8/3/034005

Web of Science
Tropospheric ozone changes, radiative forcing and attribution to emissions in the Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP) Reviewed

Stevenson D. S., Young P. J., Naik V., Lamarque J. -F., Shindell D. T., Voulgarakis A., Skeie R. B., Dalsoren S. B., Myhre G., Berntsen T. K., Folberth G. A., Rumbold S. T., Collins W. J., MacKenzie I. A., Doherty R. M., Zeng G., van Noije T. P. C., Strunk A., Bergmann D., Cameron-Smith P., Plummer D. A., Strode S. A., Horowitz L., Lee Y. H., Szopa S., Sudo K., Nagashima T., Josse B., Cionni I., Righi M., Eyring V., Conley A., Bowman K. W., Wild O., Archibald A.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 13 ( 6 ) page： 3063-3085 2013

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DOI： 10.5194/acp-13-3063-2013

Web of Science
Radiative forcing in the ACCMIP historical and future climate simulations Reviewed

Shindell D. T., Lamarque J. -F., Schulz M., Flanner M., Jiao C., Chin M., Young P. J., Lee Y. H., Rotstayn L., Mahowald N., Milly G., Faluvegi G., Balkanski Y., Collins W. J., Conley A. J., Dalsoren S., Easter R., Ghan S., Horowitz L., Liu X., Myhre G., Nagashima T., Naik V., Rumbold S. T., Skeie R., Sudo K., Szopa S., Takemura T., Voulgarakis A., Yoon J. -H., Lo F.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 13 ( 6 ) page： 2939-2974 2013

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DOI： 10.5194/acp-13-2939-2013

Web of Science
Preindustrial to present-day changes in tropospheric hydroxyl radical and methane lifetime from the Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP) Reviewed

Naik V., Voulgarakis A., Fiore A. M., Horowitz L. W., Lamarque J. -F., Lin M., Prather M. J., Young P. J., Bergmann D., Cameron-Smith P. J., Cionni I., Collins W. J., Dalsoren S. B., Doherty R., Eyring V., Faluvegi G., Folberth G. A., Josse B., Lee Y. H., MacKenzie I. A., Nagashima T., van Noije T. P. C., Plummer D. A., Righi M., Rumbold S. T., Skeie R., Shindell D. T., Stevenson D. S., Strode S., Sudo K., Szopa S., Zeng G.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 13 ( 10 ) page： 5277-5298 2013

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DOI： 10.5194/acp-13-5277-2013

Web of Science
Pre-industrial to end 21st century projections of tropospheric ozone from the Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP) Reviewed

Young P. J., Archibald A. T., Bowman K. W., Lamarque J. -F., Naik V., Stevenson D. S., Tilmes S., Voulgarakis A., Wild O., Bergmann D., Cameron-Smith P., Cionni I., Collins W. J., Dalsoren S. B., Doherty R. M., Eyring V., Faluvegi G., Horowitz L. W., Josse B., Lee Y. H., MacKenzie I. A., Nagashima T., Plummer D. A., Righi M., Rumbold S. T., Skeie R. B., Shindell D. T., Strode S. A., Sudo K., Szopa S., Zeng G.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 13 ( 4 ) page： 2063-2090 2013

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DOI： 10.5194/acp-13-2063-2013

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Role of meteorological variability in global tropospheric ozone during 1970-2008

Sekiya Takashi, Sudo Kengo

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 117 2012.9

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DOI： 10.1029/2012JD018054

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Global Modeling of Secondary Organic Aerosol in a Chemistry Coupled Climate Model Invited Reviewed

Kengo Sudo, Yukie Ogihara

Earozoru Kenkyu Vol. 27 ( 1 ) page： 51-61 2012.4

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Simulation of urban and regional air pollution in Bangladesh Reviewed

Ibn Azkar, M. A. M. B., S. Chatani, and K. Sudo

Journal of Geophysical Research page： in press 2012.4

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We have developed a regional scale air quality simulation using the Weather Research and Forecasting (WRF) - Community Multiscale Air Quality Model (CMAQ) to assess the suitability of such an advanced modeling system for predicting the air quality of Bangladesh and its surrounding region. The Regional Emission Inventory in Asia (REAS) was used as the emission input in this modeling approach. Both meteorological and chemical model performance were evaluated with observations including satellite data. Comparison between simulated and observed meteorological parameters revealed that the WRF can generate the necessary meteorological inputs for CMAQ. Comparison of observed and simulated concentrations of different air pollutants revealed that CMAQ greatly underestimates the concentrations of key pollutants. Comparison with satellite observations revealed that CMAQ reproduces the spatial distribution of NO2 with some underestimation in Bangladesh and India. The simulated AOD and satellite-retrieved AOD showed good temporal and spatial agreement mutually, with a correlation coefficient of 0.58. Sensitivity simulation using higher horizontal resolution emission data made by re-gridding the REAS inventory with the population distribution improved the CMAQ performance. Nevertheless, CMAQ underestimated the pollutant concentrations in Dhaka. Uncertainties in the emission inventory and in the lack of time variation in emissions input mainly contributed to the model underestimation. Model predictions show that 36-72% PM10 and 15-60% PM2.5 in Dhaka might be contributed from brick kiln emissions in monthly average of January 2004. The chemical composition of PM2.5 showed that the considerable amounts of secondary aerosols in Dhaka and carbonaceous components (particularly organic carbon) are most responsible for the model underestimation. Results suggest that improvements of emission inputs and more detailed sensitivity analysis of CMAQ model are important to assess the reliability and applicability of WRF-CMAQ modeling system in this region.

DOI： 10.1029/2011JD016509
Enhanced Mid-Latitude Tropospheric Column Ozone over East Asia: Coupled Effects of Stratospheric Ozone Intrusion and Anthropogenic Sources Reviewed

Nakatani Aya, Kondo Sayako, Hayashida Sachiko, Nagashima Tatsuya, Sudo Kengo, Liu Xiong, Chance Kelly, Hirota Isamu

JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN Vol. 90 ( 2 ) page： 207-222 2012.4

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DOI： 10.2151/jmsj.2012-204

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Enhanced Mid-Latitude Tropospheric Column Ozone over East Asia: Coupled Effects of Stratospheric Ozone Intrusion and Anthropogenic Sources Reviewed

Nakatani, A., S. Kondo, S. Hayashida, T. Nagashima, K. Sudo, X. Liu, K. Chance, and I. Hirota

J. Meteor. Soc. Japan Vol. 90 ( 2 ) page： 207-222 2012.1

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DOI： doi:10.2151/jmsj.2012-204
Simultaneous assimilation of satellite NO2, O3, CO, and HNO3 data for the analysis of tropospheric chemical composition and emissions Reviewed

Miyazaki, K., H. J. Eskes, K. Sudo, M. Takigawa, M. van Weele, and K. F. Boersma

Atmospheric Chemistry and Physics Vol. 12 ( 20 ) page： 9545-9579 2012.1

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Role of meteorological variability in global tropospheric ozone during 1970-2008 Reviewed

Sekiya, T. and K. Sudo

J. Geophys. Res. Vol. 117 ( D18 ) 2012.1

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DOI： doi:10.1029/2012JD018054
Anthropogenic changes in the surface all-sky UVB radiation through 1850-2005 simulated by an Earth system model Reviewed

Watanabe, S., T. Takemura, K. Sudo, T. Yokohata, and H. Kawase

Atmospheric Chemistry and Physics Vol. 12 page： 5249-5257 2012.1

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Global air quality and climate Reviewed

Fiore, A.M., Vaishali Naik, Dominick V. Spracklen, Allison Steiner, Nadine Unger, Michael Prather, Dan Bergmann, Philip J. Cameron-Smith, Irene Cionni, William J. Collins, Stig Dalsoren, Veronika Eyring, Gerd A. Folberth, Paul Ginoux, Larry W. Horowitz, Beatrice Josse, J-F Lamarque, Ian A. MacKenzie, Tatsuya Nagashima, Fiona M. O'Connor, Mattia Righi, Steven T. Rumbold, Drew T. Shindell, Ragnhild B. Skeie, Kengo Sudo, Sophie Szopa, Toshihiko Takemura and Guang Zeng

Chem. Soc. Rev. Vol. 41 page： 6663-6683 2012.1

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DOI： doi:10.1039/c2cs35095e
Global NOx emission estimates derived from an assimilation of OMI tropospheric NO2 columns Reviewed

K. Miyazaki, H. J. Eskes, and K. Sudo

Atmos. Chem. Phys. Vol. 12 page： 2263-2288 2012

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A data assimilation system has been developed to estimate global nitrogen oxides (NOx) emissions using OMI tropospheric NO2 columns (DOMINO product) and a global chemical transport model (CTM), the Chemical Atmospheric GCM for Study of Atmospheric Environment and Radiative Forcing (CHASER). The data assimilation system, based on an ensemble Kalman filter approach, was applied to optimize daily NOx emissions with a horizontal resolution of 2.8° during the years 2005 and 2006. The background error covariance estimated from the ensemble CTM forecasts explicitly represents non-direct relationships between the emissions and tropospheric columns caused by atmospheric transport and chemical processes. In comparison to the a priori emissions based on bottom-up inventories, the optimized emissions were higher over eastern China, the eastern United States, southern Africa, and central-western Europe, suggesting that the anthropogenic emissions are mostly underestimated in the inventories. In addition, the seasonality of the estimated emissions differed from that of the a priori emission over several biomass burning regions, with a large increase over Southeast Asia in April and over South America in October. The data assimilation results were validated against independent data: SCIAMACHY tropospheric NO2 columns and vertical NO2 profiles obtained from aircraft and lidar measurements. The emission correction greatly improved the agreement between the simulated and observed NO2 fields; this implies that the data assimilation system efficiently derives NOx emissions from concentration observations. We also demonstrated that biases in the satellite retrieval and model settings used in the data assimilation largely affect the magnitude of estimated emissions. These dependences should be carefully considered for better understanding NOx sources from top-down approaches.

DOI： 10.5194/acp-12-2263-2012
Anthropogenic changes in the surface all-sky UV-B radiation through 1850-2005 simulated by an Earth system model Reviewed

Watanabe S., Takemura T., Sudo K., Yokohata T., Kawase H.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 12 ( 11 ) page： 5249-5257 2012

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DOI： 10.5194/acp-12-5249-2012

Web of Science
Global air quality and climate Reviewed

Fiore Arlene M., Naik Vaishali, Spracklen Dominick V., Steiner Allison, Unger Nadine, Prather Michael, Bergmann Dan, Cameron-Smith Philip J., Cionni Irene, Collins William J., Dalsoren Stig, Eyring Veronika, Folberth Gerd A., Ginoux Paul, Horowitz Larry W., Josse Beatrice, Lamarque Jean-Francois, MacKenzie Ian A., Nagashima Tatsuya, O'Connor Fiona M., Righi Mattia, Rumbold Steven T., Shindell Drew T., Skeie Ragnhild B., Sudo Kengo, Szopa Sophie, Takemura Toshihiko, Zeng Guang

CHEMICAL SOCIETY REVIEWS Vol. 41 ( 19 ) page： 6663-6683 2012

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DOI： 10.1039/c2cs35095e

Web of Science
Simultaneous assimilation of satellite NO2, O-3, CO, and HNO3 data for the analysis of tropospheric chemical composition and emissions Reviewed

Miyazaki K., Eskes H. J., Sudo K., Takigawa M., van Weele M., Boersma K. F.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 12 ( 20 ) page： 9545-9579 2012

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DOI： 10.5194/acp-12-9545-2012

Web of Science
A study of uncertainties in the sulfate distribution and its radiative forcing associated with sulfur chemistry in a global aerosol model, Reviewed

Goto, D., Nakajima, T., Takemura, T., and Sudo, K.

Atmospheric Chemistry and Physics Vol. 11 page： 10889-10910 2011.11

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DOI： doi:10.5194/acp-11-10889-2011
Influences of the variation in inflow to East Asia on surface ozone over Japan during 1996-2005 Reviewed

Chatani, S. and K. Sudo

Atmospheric Chemistry and Physics Vol. 11 page： 8745-8758 2011.11

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DOI： doi:10.5194/acp-11-8745-2011
Future changes in tropospheric ozone under Representative Concentration Pathways (RCPs) Reviewed

Kawase, H., T. Nagashima, K. Sudo, and T. Nozawa

Geophys. Res. Lett. Vol. 38 ( L05801 ) 2011.11

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DOI： doi:10.1029/2010GL046402
Future projections of surface UV-B in a changing climate Reviewed

Watanabe, S., K. Sudo, T. Nagashima, T. Takemura, H. Kawase, and T. Nozawa

J. Geophys. Res. Vol. 116 ( D16118 ) 2011.11

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DOI： doi:10.1029/2011JD015749
The impact of soil uptake on the global distribution of molecular hydrogen: chemical transport model simulation Reviewed

Yashiro, H., K. Sudo, Yonemura, S., and Takigawa, M.

Atmospheric Chemistry and Physics Vol. 11 page： 6701-6719 2011.11

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DOI： doi:10.5194/acp-11-6701-2011
Future projections of surface UV-B in a changing climate Reviewed

Watanabe S., Sudo K., Nagashima T., Takemura T., Kawase H., Nozawa T.

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 116 2011.8

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DOI： 10.1029/2011JD015749

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Future changes in tropospheric ozone under Representative Concentration Pathways (RCPs) Reviewed

Kawase Hiroaki, Nagashima Tatsuya, Sudo Kengo, Nozawa Toru

GEOPHYSICAL RESEARCH LETTERS Vol. 38 2011.3

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DOI： 10.1029/2010GL046402

Web of Science
MIROC-ESM 2010: model description and basic results of CMIP5-20c3m experiments, Reviewed

Watanabe, S., Hajima, T., Sudo,K., Nagashima, T., Takemura, T., Okajima, H., Nozawa, T., Kawase, H., Abe, M., Yokohata, T., Ise, T., Sato, H., Kato, E., Takata, K., Emori, S., and Kawamiya, M.:

Geosci. Model Dev Vol. 4 ( 2256 ) page： 845-872 2011

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DOI： doi:10.5194/gmd-4-845-2011
Evaluation of methane emissions from West Siberian wetlands based on inverse modeling Reviewed

H-S. Kim, S. Maksyutov, M. V. Glagolev, T. Machida, P. K. Patra, K. Sudo and G. Inoue

Environ. Res. Lett. Vol. 6 ( 035201 ) 2011

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DOI： doi:10.1088/1748-9326/6/3/035201
Evaluation of methane emissions from West Siberian wetlands based on inverse modeling Reviewed

Kim H-S, Maksyutov S., Glagolev M. V., Machida T., Patra P. K., Sudo K., Inoue G.

ENVIRONMENTAL RESEARCH LETTERS Vol. 6 ( 3 ) 2011

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DOI： 10.1088/1748-9326/6/3/035201

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A study of uncertainties in the sulfate distribution and its radiative forcing associated with sulfur chemistry in a global aerosol model Reviewed

Goto D., Nakajima T., Takemura T., Sudo K.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 11 ( 21 ) page： 10889-10910 2011

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DOI： 10.5194/acp-11-10889-2011

Web of Science
Influences of the variation in inflow to East Asia on surface ozone over Japan during 1996-2005 Reviewed

Chatani S., Sudo K.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 11 ( 16 ) page： 8745-8758 2011

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DOI： 10.5194/acp-11-8745-2011

Web of Science
The impact of soil uptake on the global distribution of molecular hydrogen: chemical transport model simulation Reviewed

Yashiro H., Sudo K., Yonemura S., Takigawa M.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 11 ( 13 ) page： 6701-6719 2011

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DOI： 10.5194/acp-11-6701-2011

Web of Science
MIROC-ESM 2010: model description and basic results of CMIP5-20c3m experiments Reviewed

Watanabe S., Hajima T., Sudo K., Nagashima T., Takemura T., Okajima H., Nozawa T., Kawase H., Abe M., Yokohata T., Ise T., Sato H., Kato E., Takata K., Emori S., Kawamiya M.

GEOSCIENTIFIC MODEL DEVELOPMENT Vol. 4 ( 4 ) page： 845-872 2011

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DOI： 10.5194/gmd-4-845-2011

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Influences of the variation in inflow to East Asia on surface ozone over Japan during 1996-2005 Reviewed

S.Chatani and K.Sudo

Atmospheric Chemistry and Physics Discussions Vol. 10 page： 30823-30856 2010.12

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The relative importance of various source regions on East Asiansurface ozone Reviewed

T.Nagashima, T.Ohara, K.Sudo, H.Akimoto

Atmospheric Chemistry and Physics Vol. 10 page： 11305-11322 2010.11

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We estimated the source-receptor relationship
for surface O3 in East Asia during the early 2000s using
a method that tags O3 tracers according to their region of
chemical production (tagged tracer method) with a global
chemical transport model. The estimation demonstrated the
importance of intracontinental transport of O3 inside East
Asia as well as of the transport of O3 from distant source
regions.
Coupled effects of land use and aerosols changes and their impacts on Asian climate Invited Reviewed

Kengo Sudo, Kumiko Takata, Toshihiko, Takemura, Hiroshi Kanzawa, Tetsuzo Yasunari

Low Temperature Science Vol. 68 page： 129-136 2010.3

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This study assesses the roles of aerosols in the past/present changes in Asian climate and monsoon, isolating impacts of individual aerosol components in the framework of the CCSR/NIES/FRCGC climate model (MIROC). Many recent studies suggest that increases in anthropogenic aerosols such as black carbon and sulfate may play a crucial role in Asian climate change as observed. Our previous studies also demonstrate the significance of aerosol increases (sulfate and carbonaceous aerosols) in the simulated precipitation changes in Asia (e.g., Arai et al., 2009). In this study, we particularly focus on the changes of nitrate and secondary organic aerosols (SOA) which are tightly linked to land use change in regions like Asia, but not treated in our previous aerosol studies. We newly introduced simulation of nitrate aerosol in our climate model. Our simulation shows that there are anomalously high concentrations of nitrate aerosol in South Asia (particularly around India and Bangladesh), coming from abundant ammonium and less sulfate components in this region. In India, free tropospheric mixing ratio and number concentration of nitrate in fine mode are both larger than those of sulfate in winter to early summer. Our study estimates large cooling (1-2 W m-2) in South Asia due to nitrate increase in terms of direct radiative forcing for 1850-2000. This result suggests nitrate aerosol may play an important role in the observed changes in Asian monsoon. In addition, we estimate changes in biogenic VOCs emissions associated with land use change during 1850-2000; biogenic VOCs like terpenes are important precursors of SOA. We estimate significant reduction (50-70%) in terpenes and other VOCs emissions in the central Eurasia, North America, and Asia due to intense cultivation and deforestation in these areas. Responding to the VOCs decreases during 1850-2000, our model calculates large reduction of SOA, leading to a positive direct radiative forcing (warming) of 0.5-1 W m-2 in Sou
A multi-model analysis of vertical ozone profiles Reviewed

Jonson,J.E., A. Stohl, A. M. Fiore, P. Hess, S. Szopa, O. Wild, G. Zeng, F. J. Dentener, A. Lupu, M. G. Schultz, B. N. Duncan, K. Sudo, et al.

Atmospheric Chemistry and Physics Vol. 10 page： 5759-5783 2010

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The relative importance of various source regions on East Asian surface ozone Reviewed

Nagashima T., Ohara T., Sudo K., Akimoto H.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 10 ( 22 ) page： 11305-11322 2010

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DOI： 10.5194/acp-10-11305-2010

Web of Science
A multi-model analysis of vertical ozone profiles Reviewed

Jonson J. E., Stohl A., Fiore A. M., Hess P., Szopa S., Wild O., Zeng G., Dentener F. J., Lupu A., Schultz M. G., Duncan B. N., Sudo K., Wind P., Schulz M., Marmer E., Cuvelier C., Keating T., Zuber A., Valdebenito A., Dorokhov V., De Backer H., Davies J., Chen G. H., Johnson B., Tarasick D. W., Stuebi R., Newchurch M. J., von der Gathen P., Steinbrecht W., Claude H.

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 10 ( 12 ) page： 5759 - 5783 2010

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Publishing type：Research paper (scientific journal)

DOI： 10.5194/acp-10-5759-2010

Web of Science
Temporal and spatial variations of carbon monoxide over the western part of the Pacific Ocean Reviewed

Yashiro Hisashi, Sugawara Satoshi, Sudo Kengo, Aoki Shuji, Nakazawa Takakiyo

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 114 2009.4

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1029/2008JD010876

Web of Science
Temporal and spatial variations of carbon monoxide over the western part of the Pacific Ocean Reviewed

Yashiro, H., S. Sugawara, K. Sudo, S. Aoki, and T. Nakazawa

Journal of Geophysical Research page： doi:10.1029/2008JD010876 2009

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Development of an Atmospheric General Circulation Model for Integrated Earth System Modeling on the Earth Simulator Reviewed

Watanabe,S.,H. Miura,M. Sekiguchi,T. Nagashima,K. Sudo,S. Emori,M. Kawamiya

J. Earth Sim. Vol. 9 page： 27-35 2008

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Language：English Publishing type：Research paper (scientific journal)

The project aims at development of an integrated earth system model, where biological and chemical processes important for the global environment are included to interact with climate changes. The model is developed by adding individual component models to atmospheric and oceanic general circulation models
(GCMs).The component models are terrestrial and oceanic carbon cycle models and an atmospheric chemistry
model.
Global modeling analysis of tropospheric ozone and its radiative forcing from biomass burning emissions in the twentieth century

Ito Akinori, Sudo Kengo, Akimoto Hajime, Sillman Sanford, Penner Joyce E.

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 112 ( D24 ) 2007.12

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Language：Japanese Publishing type：Research paper (scientific journal)

DOI： 10.1029/2007JD008745

Web of Science
Global source attribution of tropospheric ozone: Long-range transport from various source regions Reviewed

Sudo K., Akimoto H.

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 112 ( D12 ) 2007.6

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1029/2006JD007992

Web of Science
Multi-model simulations of the impact of international shipping on atmospheric chemistry and climate in 2000 and 2030 Reviewed

V. Eyring, D. S. Stevenson, A. Lauer, F. J. Dentener, T. Butler, W. J. Collins, K. Ellingsen, M. Gauss, D. A. Hauglustaine, I. S. A. Isaksen, M. G. Lawrence, A. Richter, J. M. Rodriguez, M. Sanderson, S. E. Strahan, K. Sudo, S. Szopa, T. P. C. van Noije, and O. Wild

Atmospheric Chemistry and Physics Vol. 7 page： 757-780 2007

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Language：English Publishing type：Research paper (scientific journal)

The global impact of shipping on atmospheric chemistry and radiative forcing, as well as the associated uncertainties, have been quantified using an ensemble of ten state-of-the-art atmospheric chemistry models and a pre-defined set of emission data. The analysis is performed for present-day conditions (year 2000) and for two future ship emission scenarios.
*Global source attribution of tropospheric ozone: Long-range transport from various source regions Reviewed

Sudo, K. and H. Akimoto

J. Geophys. Res Vol. 112 ( D12302 ) page： doi:10.1029/2006JD007992 2007

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

We examine contributions from various source regions to global distributions and
budgets of tropospheric ozone (O3) in the context of intercontinental transport, using
tagged tracer simulation with a global chemical transport model. For tagging O3, we
consider regional separation of the model domain on the basis of the distributions of O3
chemical production. We define 14 polluted source regions (14 tracers) in the boundary
layer (North America, Europe, China, etc.) and 8 regions (8 tracers) in the free
troposphere; O3 production in the remaining (remote) tropospheric region and O3 transport
from the stratosphere are also tagged as separate tracers.
Multimodel simulations of carbon monoxide: Comparison with observations and projected near-future changes

Shindell D. T., Faluvegi G., Stevenson D. S., Krol M. C., Emmons L. K., Lamarque J. -F., Petron G., Dentener F. J., Ellingsen K., Schultz M. G., Wild O., Amann M., Atherton C. S., Bergmann D. J., Bey I., Butler T., Cofala J., Collins W. J., Derwent R. G., Doherty R. M., Drevet J., Eskes H. J., Fiore A. M., Gauss M., Hauglustaine D. A., Horowitz L. W., Isaksen I. S. A., Lawrence M. G., Montanaro V., Mueller J. -F., Pitari G., Prather M. J., Pyle J. A., Rast S., Rodriguez J. M., Sanderson M. G., Savage N. H., Strahan S. E., Sudo K., Szopa S., Unger N., van Noije T. P. C., Zeng G.

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 111 ( D19 ) 2006.10

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Language：Japanese Publishing type：Research paper (scientific journal)

DOI： 10.1029/2006JD007100

Web of Science
The global atmospheric environment for the next generation

Dentener F., Stevenson D., Ellingsen K., van Noije T., Schultz M., Amann M., Atherton C., Bell N., Bergmann D., Bey I., Bouwman L., Butler T., Cofala J., Collins B., Drevet J., Doherty R., Eickhout B., Eskes H., Fiore A., Gauss M., Hauglustaine D., Horowitz L., Isaksen I. S. A., Josse B., Lawrence M., Krol M., Lamarque J. F., Montanaro V., Muller J. F., Peuch V. H., Pitari G., Pyle J., Rast S., Rodriguez J., Sanderson M., Savage N. H., Shindell D., Strahan S., Szopa S., Sudo K., Van Dingenen R., Wild O., Zeng G.

ENVIRONMENTAL SCIENCE & TECHNOLOGY Vol. 40 ( 11 ) page： 3586 - 3594 2006.6

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Language：Japanese Publishing type：Research paper (scientific journal)

DOI： 10.1021/es0523845

Web of Science
Multimodel ensemble simulations of present-day and near-future tropospheric ozone

Stevenson DS, Dentener FJ, Schultz MG, Ellingsen K, van Noije TPC, Wild O, Zeng G, Amann M, Atherton CS, Bell N, Bergmann DJ, Bey I, Butler T, Cofala J, Collins WJ, Derwent RG, Doherty RM, Drevet J, Eskes HJ, Fiore AM, Gauss M, Hauglustaine DA, Horowitz LW, Isaksen ISA, Krol MC, Lamarque JF, Lawrence MG, Montanaro V, Muller JF, Pitari G, Prather MJ, Pyle JA, Rast S, Rodriguez JM, Sanderson MG, Savage NH, Shindell DT, Strahan SE, Sudo K, Szopa S

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 111 ( D8 ) 2006.4

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Language：Japanese Publishing type：Research paper (scientific journal)

DOI： 10.1029/2005JD006338

Web of Science
Radiative forcing since preindustrial times due to ozone change in the troposphere and the lower stratosphere

Gauss M, Myhre G, Isaksen ISA, Grewe V, Pitari G, Wild O, Collins WJ, Dentener FJ, Ellingsen K, Gohar LK, Hauglustaine DA, Iachetti D, Lamarque JF, Mancini E, Mickley LJ, Prather MJ, Pyle JA, Sanderson MG, Shine KP, Stevenson DS, Sudo K, Szopa S, Zeng G

ATMOSPHERIC CHEMISTRY AND PHYSICS Vol. 6 page： 575 - 599 2006.2

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Language：Japanese Publishing type：Research paper (scientific journal)

Web of Science
*Radiative forcing since preindustrial times due to ozone change in the troposphere and the lower stratosphere Reviewed

Gauss M., G. Myhre, I. S. A. Isaksen, W. J. Collins, F. J. Dentener, K. Ellingsen, L. K. Gohar, V. Grewe, D. A. Hauglustaine, D. Iachetti, J.-F. Lamarque, E. Mancini, L. J. Mickley, G. Pitari, M. J. Prather, J. A. Pyle, M. G. Sanderson, K. P. Shine, D. S. Stevenson, K. Sudo, S. Szopa, O. Wild, and G. Zeng

Atmospheric Chemistry and Physics Vol. 6 page： 575-599 2006

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Language：English Publishing type：Research paper (scientific journal)

Changes in atmospheric ozone have occurred since the preindustrial era as a result of increasing anthropogenic emissions. Within ACCENT, a European Network of Excellence, ozone changes between 1850 and 2000 are assessed for the troposphere and the lower stratosphere (up to 30 km) by a variety of seven chemistry-climate models and three chemical transport models.
Multi-model ensemble simulations of tropospheric NO2 compared with GOME retrievals for the year 2000 Reviewed

van Noije, T.P.C, H. J. Eskes, F. J. Dentener, D. S. Stevenson, K. Ellingsen, M. G. Schultz, O. Wild, M. Amann, C. S. Atherton, D. J. Bergmann, I. Bey, K. F. Boersma, T. Butler, J. Cofala, J. Drevet, A. M. Fiore, M. Gauss, D. A. Hauglustaine, L. W. Horowitz, I. S. A. Isaksen, M. C. Krol, J.-F. Lamarque, M. G. Lawrence, R. V. Martin, V. Montanaro, J.-F. Muller, G. Pitari, M. J. Prather, J. A. Pyle, A. Richter, J. M. Rodriguez, N. H. Savage, S. E. Strahan, K. Sudo, and S. Szopa

Atmospheric Chemistry and Physics Vol. 6 page： 2943-2979 2006

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Language：English Publishing type：Research paper (scientific journal)

We present a systematic comparison of tropospheric NO2 from 17 global atmospheric chemistry models with three state-of-the-art retrievals from the Global Ozone Monitoring Experiment (GOME) for the year 2000.
Nitrogen and sulfur deposition on regional and global scales: A multimodel evaluation Reviewed

Dentener, F., J. Drevet, J.F. Lamarque, I. Bey, B. Eickhout, A.M. Fiore, D. Hauglustaine, L.W. Horowitz, M. K. Sudo, et al.

Global Biogeochemical Cycles Vol. 20 ( GB4003 ) page： doi:10.1029/2005GB002672 2006

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Language：English Publishing type：Research paper (scientific journal)

We use 23 atmospheric chemistry transport models to calculate current and future (2030) deposition of reactive nitrogen (NOy, NHx) and sulfate (SOx) to land and ocean surfaces.
*The global atmospheric environment for the next generation Reviewed

Dentener F., D.Stevenson, K.Ellingsen, T.van Noije, M.Schultz1, M.Amann, C.Atherton, N.Bell, D.Bergmann, I.Bey, L.Bouwman, T.Butler, J.Cofala, B.Collins, J.Drevet, R.Doherty, B.Eickhout, H.Eskes, A.Fiore, M.Gauss, D.Hauglustaine, L.Horowitz, I.Isaksen, B.Josse, M.Lawrence, M.Krol, J.F.Lamarque, V.Montanaro, J.F.Muller, V.H.Peuch, G.Pitari, J.Pyle, S.Rast, J.Rodriguez, M.Sanderson, N.H.Savage, D.Shindell, S.Strahan, S.Szopa, K.Sudo, R.Van Dingenen, O.Wild, G.Zeng

Environmental Science & Technology Vol. 40 ( 11 ) page： 3586-3594 2006

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Language：English Publishing type：Research paper (scientific journal)

Air quality, ecosystem exposure to nitrogen deposition, and climate change are intimately coupled problems: we assess changes in the global atmospheric environment between 2000 and 2030 using 26 state-of-the-art global atmospheric chemistry models and three different emissions scenarios.
Evaluation of long-term tropospheric NO2 data obtained by GOME over East Asia in 1996-2002 -: art. no. L11810

Irie, H; Sudo, K; Akimoto, H; Richter, A; Burrows, JP; Wagner, T; Wenig, M; Beirle, S; Kondo, Y; Sinyakov, VP; Goutail, F

GEOPHYSICAL RESEARCH LETTERS Vol. 32 ( 11 ) 2005.6

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1029/2005GL022770

Web of Science
Evaluation of long-term tropospheric NO2 data obtained by GOME over East Asia in 1996-2002 Reviewed

Irie, H., K. Sudo, H. Akimoto, A, Richter, J.P. Burrows, T. Wagner, M. Wenig, S. Beirle, Y. Kondo, V.P. Sinyakov, and F. Goutail

Geophys. Res. Letters Vol. 32 ( L11810 ) page： doi:10.1029/2005GL022770 2005

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Language：English Publishing type：Research paper (scientific journal)

Long-term tropospheric nitrogen dioxide (NO2)
column data obtained by the Global Ozone Monitoring
Experiment (GOME) (G-NO2) are evaluated to confirm the
trends found in tropospheric NO2 abundances over East
Asia between 1996 and 2002.
Development of an Integrated Earth System Model on the Earth simulator Reviewed

Kawamiya, M., C. Yoshikawa, T. Kato, H. Sato, K. Sudo, S. Watanabe, and T. Matsuno

J. Earth Sim. Vol. 4 page： 18-30 2005

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Language：English Publishing type：Research paper (scientific journal)

The project aims at development of an integrated earth system model, where biological and chemical processes important for the global environment are included to interact with climate changes. The model is developed by adding individual component models to atmospheric and oceanic general circulation models
(GCMs).The component models are terrestrial and oceanic carbon cycle models and an atmospheric chemistry
model.
Estimation of the contribution of intercontinental transport during the PEACE campaign by using a global model Reviewed

Takigawa M., K. Sudo, H. Akimoto, K. Kita, N. Takegawa, Y. Kondo, and M. Takahashi

J. Geophys. Res. Vol. 110 ( D21313 ) page： doi:10.1029/2005JD006226 2005

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Language：English Publishing type：Research paper (scientific journal)

A quasi-real-time calculation system for the global distribution of ozone (O3) and its
precursors, including CO, NOx, and nonmethane hydrocarbons (NMHCs), has been newly
developed by using a 3D chemical transport model.
Why does surface ozone peak in summertime at Waliguan? Reviewed

Zhu, B., H. Akimoto, Z. Wang, K. Sudo, J. Tang, and I. Uno

Geophys. Res. Letters. Vol. 31 ( L17104 ) page： doi:10.1029/2004GL020609 2004

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Language：English Publishing type：Research paper (scientific journal)

The seasonal variation of boundary layer ozone over East Asia is investigated using a regional scale chemical transport model, with the initial and boundary conditions of chemical species obtained from a global chemistry model.
Future changes in stratosphere-troposphere exchange and their impacts on future tropospheric ozone simulations

Sudo K, Takahashi M, Akimoto H

GEOPHYSICAL RESEARCH LETTERS Vol. 30 ( 24 ) 2003.12

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Language：Japanese Publishing type：Research paper (scientific journal)

DOI： 10.1029/2003GL018526

Web of Science
Phenotypic analysis of Meltrin alpha (ADAM12)-deficient mice: Involvement of Meltrin alpha in adipogenesis and myogenesis Reviewed

Kurisaki T, Masuda A, Sudo K, Sakagami J, Higashiyama S, Matsuda Y, Nagabukuro A, Tsuji A, Nabeshima Y, Asano M, Iwakura Y, Sehara-Fujisawa A

MOLECULAR AND CELLULAR BIOLOGY Vol. 23 ( 1 ) page： 55-61 2003.1

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Language：English Publishing type：Research paper (scientific journal)

DOI： 10.1128/MCB.23.1.55-61.2003

Web of Science
*Future changes in stratosphere-troposphere exchange and their impacts on future tropospheric ozone simulations Reviewed

Sudo, K., M. Takahashi, and H. Akimoto

Geophys. Res. Letters. Vol. 30 ( 2256 ) page： doi:10.1029/2003GL018526 2003

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

We assess future climate change impacts on stratosphere-troposphere exchange (STE) and their influences on tropospheric O3, using a chemistry coupled climate model.
CHASER: A global chemical model of the troposphere - 2 . Model results and evaluation

Sudo K, Takahashi M, Akimoto H

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 107 ( D21 ) 2002.11

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Language：Japanese Publishing type：Research paper (scientific journal)

DOI： 10.1029/2001JD001114

Web of Science
CHASER: A global chemical model of the troposphere - 1. Model description

Sudo K, Takahashi M, Kurokawa J, Akimoto H

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES Vol. 107 ( D17 ) 2002.9

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Language：Japanese Publishing type：Research paper (scientific journal)

DOI： 10.1029/2001JD001113

Web of Science
CHASER: A global chemical model of the troposphere 2. Model results and evaluation, Reviewed

Sudo, K., M. Takahashi, and H. Akimoto

J. Geophys. Res. Vol. 107 page： doi:10.1029/2001/JD001114 2002

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

We present results from a global three-dimensional chemical model for the troposphere, named Chemical AGCM for Study of Atmospheric Environment and Radiative Forcing (CHASER).
CHASER: A global chemical model of the troposphere 1. Model description, Reviewed

Sudo, K., M. Takahashi, J. Kurokawa, and H. Akimoto

J. Geophys. Res. Vol. 107 page： doi:10.1029/2001JD001113 2002

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

We present a new global three-dimensional chemical model for the troposphere, named chemical atmospheric general circulation model (AGCM) for study of atmospheric environment and radiative forcing (CHASER).
Simulation of tropospheric ozone changes during 1997-1998 El Nino: Meteorological impact on tropospheric photochemistry

Sudo K, Takahashi M

GEOPHYSICAL RESEARCH LETTERS Vol. 28 ( 21 ) page： 4091 - 4094 2001.11

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Language：Japanese Publishing type：Research paper (scientific journal)

Web of Science
*Simulation of tropospheric ozone changes during 1997-1998 El Nino: Meteorological impcat on tropospheric photochemistry Reviewed

Sudo, K. and M. Takahashi

Geophys. Res. Letters. Vol. 28 page： 4091-4094 2001

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Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

The impact of the 1997-1998 El Nino event on the tropospheric ozone distribution and related processes is assessed by a simulation using a global chemical model.

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To the head of Papers.▲

Presentations 52

Potential impacts of climate—biogeochemical feedback on future methane projection

JpSAC meeting 2023 2023.11.22

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Event date： 2023.11

Language：English Presentation type：Oral presentation (general)
まったなし温暖化対策：　脱炭素で間に合う？ Invited

須藤健悟

環境シンポジウム「地球と都市の温暖化に立ち向かう」 2023.7.20 中京テレビ・名大環境学研究科

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Event date： 2023.7

Language：Japanese Presentation type：Public lecture, seminar, tutorial, course, or other speech

Venue：中京テレビ本社
短寿命微量気体の全球変動と温暖化対策としての可能性 Invited

須藤健悟

「気候変動と大気汚染　―短寿命気候強制因子の影響と緩和―」公開ウェビナー 2023.5.23 環境研究総合推進費S-20プロジェクト

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Event date： 2023.5

Language：Japanese Presentation type：Public lecture, seminar, tutorial, course, or other speech
Impacts of the Chinese SLCFs emission changes during 2010s on East Asian and global climate International conference

Kengo Sudo, Jinling Wang

JpGU meeting 2023 2023.5.23

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Event date： 2023.5

Language：English Presentation type：Oral presentation (general)
Initial dispersion and conversion of stratospheric SO2 injected by 2022 Hunga Tonga eruption International conference

Yuto Masaki, Takashi Sekiya, Kengo Sudo

JpGU meeting 2023 2023.5.23

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Event date： 2023.5

Language：English Presentation type：Oral presentation (general)
～地球は生きている～ ①地球規模の環境変動と人間 Invited

須藤健悟

NHK【教室】ひとの大学2023 2023.4.12 NHK名古屋

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Event date： 2023.4

Language：Japanese Presentation type：Public lecture, seminar, tutorial, course, or other speech
短寿命大気成分（SLCPs）から考える気候変動と温暖化緩和策 Invited

須藤健悟

気候変動をもたらす要因、気候変動がもたらす未来 2022.10.3 あいちゼロカーボン推進協議会

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Event date： 2022.10

Language：Japanese Presentation type：Public lecture, seminar, tutorial, course, or other speech
Global simulation of SO2 and sulfate aerosol from the Hunga-Tonga eruption: Potential impacts on atmospheric chemistry and climate International conference

Kengo Sudo, Takashi Sekiya

JpGU meeting 2022 2022.5.30

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Event date： 2022.5

Language：English Presentation type：Poster presentation
Interannual variation in methane for 2000-2020: a global simulation with CHASER/VISIT International conference

Kengo Sudo, Yuta Nakata, Akihiko Ito

JpGU meeting 2022 2022.5.27

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Event date： 2022.5

Language：English Presentation type：Oral presentation (general)
コンピュータ上に作るもう一つの地球 Invited

須藤健悟

ノーベル賞特別講演会：気候変動と有機触媒 2021.11.20 名古屋大学

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Event date： 2021.11

Language：Japanese Presentation type：Public lecture, seminar, tutorial, course, or other speech

Venue：名古屋大学
A Modeling Study on the Roles of Cloud Distribution in Global Ozone Chemistry International conference

Kengo Sudo, Ryoki Matsuda

Quadrennial Ozone Symposium 2021, 3-9 Oct. 2021 2021.10.5 IGAC

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Event date： 2021.10

Language：English Presentation type：Oral presentation (general)

Country：Korea, Republic of
Can a global chemistry climate model reproduce interannual variabilities and trends of depositions of sulfate, nitrate, and ammonium preserved in the Southeastern Greenland Dome ice core? International conference

Kengo SUDO, Hinako Shiratsuchi, Takato Onishi, Satoru Iizuka

the 16th IGAC Conference, Atmospheric Chemistry at a Distance: Real Progress through Virtual Interaction 2021.9.14 IGAC

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Event date： 2021.9

Language：English Presentation type：Poster presentation

Venue：Online
Simulating HONO chemistry in a chemistry climate/transport model CHASER (MIROC) Invited International coauthorship International conference

Kengo Sudo; Ha Thi Minh Phuc; Lola Andrés Hernández, Schreiner Benjamin

EMeRGe zoom Workshop TEAM-5: 2021.6.17

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Event date： 2021.6

Language：English Presentation type：Oral presentation (general)

Venue：3Institut für Umweltphysik, Universität Heidelberg
北極域における無機イオン沈着の経年変動：化学気候モデル実験とグリーンランドSE-Dome氷床コアデータの比較

須藤健悟, 白土緋那子, 大西貴都, 飯塚芳徳

第25回大気化学討論会 2020.11.11

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Event date： 2020.11

Language：Japanese Presentation type：Oral presentation (general)

Venue：on-line
CHASER(MIROC-ESM)における雲の対流圏光化学場への影響

松田涼樹, 須藤健悟

第25回大気化学討論会 2020.11.11

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Event date： 2020.11

Language：Japanese Presentation type：Oral presentation (general)

Venue：on-line
Can a global chemistry climate model reproduce interannual variabilities and trends of depositions of sulfate, nitrate, and ammonium preserved in the Southeastern Greenland Dome ice core? International conference

Kengo Sudo, Hinako Shiratuti, Yoshinori, Iizuka

JpGU-AGU Joint Meeting 2020 2020.7

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Event date： 2020.7

Language：English Presentation type：Oral presentation (general)

Venue：on-line
A modeling study on the roles of cloud distribution in global tropospheric chemistry: detailed evaluation of clouds in a chemistry climate model (MIROC-CHASER) International conference

Ryoki Matsuda, Kengo Sudo

JpGU-AGU Joint Meeting 2020 2020.7

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Event date： 2020.7

Language：English Presentation type：Oral presentation (general)

Venue：on-line
硫酸塩生成におけるダストの影響：全球化学・エアロゾル輸送モデルの改良と検証

清水俊成, 須藤健悟

日本気象学会2011年度秋季大会

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Event date： 2011.11

Language：Japanese Presentation type：Poster presentation

Country：Japan
化学・エアロゾル気候モデルを用いた短寿命気候影響物質（SLCFs）の放射強制力と気候応答の評価

須藤健悟, 竹村俊彦, 秋元肇

第１７回大気化学討論会

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Event date： 2011.10

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
Evaluating past changes in short-lived climate forcers and their climate impacts with a chemistry-aerosol coupled climate model International conference

Kengo Sudo, T.Takemura, and H. Akimoto

3rd International Workshop on Atmospheric Modeling Research in East Asia

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Event date： 2011.9

Language：English Presentation type：Oral presentation (general)

Country：China
Modelling Short-Lived Climate Forcers: Climate Impacts and Interaction International conference

Kengo Sudo, T.Takemura, and H. Akimoto

International Union of Geodesy and Geophysics (IUGG) General Assembly

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Event date： 2011.6 - 2011.7

Language：English Presentation type：Oral presentation (invited, special)

Country：Japan
Evaluating past changes in atmospheric pollutants and their climate impacts with a chemistry-aerosol coupled climate model International conference

Kengo Sudo, T.Takemura, and H. Akimoto

3rd International Workshop on Atmospheric Modeling Research in East Asia

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Event date： 2011.6

Language：English Presentation type：Oral presentation (general)

Country：China
Simulating black carbon at Syowa station, Antarctic: long-range transport from various source regions

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Event date： 2011.5

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
化学・エアロゾル気候モデルを用いた短寿命気候影響物質（SLCFs）の放射強制力の評価

須藤健悟, 竹村俊彦, 秋元肇

日本気象学会2011年度春季大会

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Event date： 2011.5

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
Leveling-off of atmospheric methane caused by coupling of climate change and tropospheric chemistry International conference

AGU(American Geophysical Union) Fall meeting 2010

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Event date： 2010.12

Language：English Presentation type：Poster presentation
Global air pollution and its interaction with climate

Workshop on Climate and Environment between Nanjing University and Nagoya University

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Event date： 2010.12

Language：English Presentation type：Oral presentation (invited, special)

Country：Japan
化学気候モデルを用いた1970-2008年のメタン変動要因の解明

須藤健悟、Patra Prabir、伊藤昭彦

大気化学討論会

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Event date： 2010.11

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
Modeling the Climate Impacts of Global Air Pollution and Short-lived Climate Forcers International conference

International Workshop on “Impact of Asian Megacity Development on Local to Global Climate Change

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Event date： 2010.10

Language：English Presentation type：Oral presentation (invited, special)
Simulation of aerosol changes in Asia with a chemistry-aerosol coupled climate model

JPGU(Japanese Geophysical Union)

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Event date： 2010.5

Language：English Presentation type：Oral presentation (invited, special)

Country：Japan
全球メタン濃度の過去再現シミュレーション：気候変動の影響

須藤健悟

日本気象学会2010年度春季大会

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Event date： 2010.5

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
Comparison between NO2 and aerosols observed by MAX-DOAS and simulated by a Chemical Transport Model at Okinawa Islnand International conference

MAX-DOAS Workshop

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Event date： 2010.2

Language：English Presentation type：Oral presentation (general)

Country：Japan
Aerosol changes associated with land use change in Asia and their impacts on climate International conference

AGU fall meeting 2009

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Event date： 2009.12

Language：English Presentation type：Oral presentation (general)
対流圏オゾンおよびメタンの過去再現シミュレーション：初期結果

須藤健悟

日本気象学会2009年度秋季大会

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Event date： 2009.11

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
Roles of Atmospheric Chemistry and Aerosols in the CCSR/NIES/FRCGC Climate Model International conference

IGAC-SPARC Joint Workshop in Kyoto

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Event date： 2009.10

Language：English Presentation type：Oral presentation (invited, special)

Country：Japan

Past O3 changes in tropo. and strato-sphereres can cause significant climate change. (also interact with CH4)
Nitrate aerosol cause significant climate impacts particularly in South Asia (India, Bangladesh, etc)
Large cooling (~1-2 W m-2 due to nitrate increase) is found in South Asia ; global mean direct radiative forcing is -0.09 W m-2.
Biogenic VOCs (terpenes) & SOA emissions are estimated to have decreased considerably (by 60-70%) in Asia during 1850-2000, leading to 0.5-1 W m-2 radiat
対流圏光化学場の過去再現シミュレーション

須藤健悟

大気化学討論会2009

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Event date： 2009.10

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
大気オゾンの研究：オゾン層から大気汚染・気候変動まで

須藤健悟

平成２１年度オゾン層保護推進大会

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Event date： 2009.9

Language：Japanese Presentation type：Oral presentation (invited, special)

Country：Japan
MAX-DOAS観測を用いた全球化学・エアロゾル気候モデルの評価

須藤健悟、入江仁士、金谷有剛、秋元肇、竹村俊彦

日本気象学会2009年度春季大会

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Event date： 2009.5

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
アジア域における大気化学・エアロゾル・陸域植生結合場の変動とその気候影響

須藤健悟（名大院・環境学）、高田久美子（海洋研究開発機構）、安成哲三（名大・水循環センター）

日本地球惑星科学連合2009年大会

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Event date： 2009.5

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
Changes in Biogenic and Anthropogenic Aerosols in Asia and their Climate Impacts

First SELIS International Workshop Eco-Climate Dynamics in Eurasia / Monsoon Asia

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Event date： 2009.1

Language：English Presentation type：Oral presentation (general)

Country：Japan

Nitrate aerosol can cause significant climate impacts particularly in South Asia (India, Bangladesh, etc)
Large cooling (~1-2 W m-2 due to nitrate increase) is found in South Asia ; global mean direct radiative forcing is -0.09 W m-2.
Biogenic VOCs (terpenes) & SOA emissions are estimated to have decreased considerably (by 60-70%) in Asia during 1850-2000, leading to 0.5-1 W m-2 radiative forcing.
Warming from SOA decrease and cooling from nitrate increase may compensate for each other.
Pl
Simulation of hemispheric scale air pollution

14th discussion meeting of Atmospheric Chemistry Society of Japan

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Event date： 2008.10

Language：Japanese Presentation type：Poster presentation

Country：Japan
Climate response to global ozone changes: impacts of tropospheric ozone increase and stratospheric ozone decrease during the 20th century International conference

IGAC 10th International Conference

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Event date： 2008.9

Language：English Presentation type：Oral presentation (general)
Changes in tropospheric chemistry and their impacts on climate: roles of climate change and the stratosphere International conference

SPARC 4th General Assembly

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Event date： 2008.9

Language：English Presentation type：Oral presentation (invited, special)
Climate Response to Global Ozone Changes: Impacts of Tropospheric Ozone Increase and Stratospheric Ozone Decrease During the 20th Century International conference

AGU(American Geophysical Union) Fall meeting 2007

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Event date： 2007.12

Language：English Presentation type：Oral presentation (general)
Climate impacts of global ozone changes: effects of tropospheric ozone increase and stratospheric ozone decrease during the 20th century

13th discussion meeting of Atmospheric Chemistry society of Japan

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Event date： 2007.11

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
Climate impacts of global ozone changes:

2007 fall meeting of Meteorological Society of Japan

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Event date： 2007.10

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
Temporal and Spatial Variations of Tropospheric Carbon Monoxide over Japan

JPGU

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Event date： 2007.5

Language：Japanese Presentation type：Poster presentation

Country：Japan
産業革命以前から現在までの対流圏オゾン変動が気候に及ぼす影響

須藤健悟（名大院・環境学）、秋元肇（地球フロンティア）

日本地球惑星科学連合2007年大会

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Event date： 2007.5

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
Development of a chemical data assimilation system using a local ensemble transformKalman filter

JPGU

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Event date： 2007.5

Language：Japanese Presentation type：Poster presentation

Country：Japan
対流圏オゾンの熱帯域マッデン・ジュリアン振動

須藤健悟

第１７回大気化学シンポジウム

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Event date： 2007.1

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
対流圏オゾン変動の気候影響評価: 化学気候モデル実験による初期結果

須藤健悟（名大院・環境学）, 秋元肇（地球フロンティア）

第１７回大気化学シンポジウム

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Event date： 2007.1

Language：Japanese Presentation type：Oral presentation (general)

Country：Japan
Source attribution of global O3 and CO: climatology and interannual variability International conference

Joint IGAC/CACGP/SOLAS/WMO Symposium: Atmospheric Chemistry at the interfaces

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Event date： 2006.9

Language：English Presentation type：Poster presentation
全球対流圏オゾンの変動要因：エミッション・気候・成層圏オゾンの各変動の影響

須藤健悟, 高橋正明、秋元肇

日本気象学会２００６年度春季大会

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Event date： 2006.5

Language：Japanese Presentation type：Poster presentation

Country：Japan

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To the head of Presentations.▲

Research Project for Joint Research, Competitive Funding, etc. 7

短寿命微量気体による気候変動の定量的評価

Grant number：S-20-1(2) 2021.4 - 2026.3

環境省地球環境研究総合推進費(S-20-1) 戦略課題

須藤健悟、永島達也

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Grant type：Competitive

Grant amount：\26000000 （ Direct Cost: \20000000 、 Indirect Cost：\6000000 ）
数値モデルを用いた短寿命微量気体による気候変動の評価

2014.4 - 2019.3

環境省地球環境研究総合推進費(S-12-3)

須藤健悟

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Grant type：Competitive

化学気候モデルを用い、複数シナリオによる将来予測実験を実施し（他サブテーマと連携）、各シナリオにおいて将来の気温・降水変動などに対し、各種SLCPsが及ぼす寄与を分離・評価し、微量気体（大気化学）・エアロゾル相互作用の役割を定量化する。さらに、大気質（オゾン・PM等）と温暖化への影響の観点から各シナリオを評価し、総合的にまとめる。
東アジアにおける広域大気汚染の解明と温暖化対策との共便益を考慮した大気環境管理の推進に関する総合的研究

2009.4 - 2014.3

環境省地球環境研究総合推進費(S-7-1)

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Grant type：Competitive

化学気候モデルCHASERおよびエアロゾル気候モデルSPRINTARSの結合シミュレーションにより、大気汚染物質の長距離輸送のモデル定量化、および大気汚染と温暖化の共便益(co-befit）に関する数値実験を実施する。
Coupled impacts of landuse and aerosols changes on Asian climate

2009.4 - 2012.3

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Grant type：Competitive
地上分光法による対流圏中のガス・エアロゾル同時観測網の構築

2006.4 - 2011.3

文科省・地球観測システム構築推進プラン

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Grant type：Competitive
人間活動によるアジアモンスーン変化の定量的評価と予測に関する研究

2006.4 - 2009.3

環境省地球環境研究総合推進費（B-062）

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Grant type：Competitive

気候モデル「エアロゾル増減」実験によるアジアモンスーン変化の評価
アジアにおけるオゾン・ブラックカーボンの空間的・時間的変動と気候影響に関する研究

2005.4 - 2008.3

環境省地球環境研究総合推進費

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Grant type：Competitive

対流圏オゾンおよびブラックカーボンの気候影響を定量的に見積もる。

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To the head of Research Project for Joint Research, Competitive Funding, etc..▲

KAKENHI (Grants-in-Aid for Scientific Research) 16

BVOCを介した植物・気候相互作用のモデリングと将来予測

Grant number：23H04971 2023.4 - 2028.3

科学研究費助成事業学術変革領域研究(A)

須藤健悟, 竹村俊彦, 入江仁士, 関谷高志

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Authorship：Principal investigator

Grant amount：\111930000 （ Direct Cost: \86100000 、 Indirect Cost：\25830000 ）

本研究は、植物が大気に放出する揮発性有機化合物（BVOC）の実態・動態、およびBVOCを介した植物と気候の相互作用を全球規模で解明・予測するものである。本課題では、研究代表者・分担者らが独自に開発を行ってきた、大気化学・エアロゾル・気候モデル、陸域生態系モデル、衛星・地上リモートセンシング、および大気化学データ同化システムなど最新の研究手法を駆使し、他計画研究班の植物フェノロジー・BVOC放出の観測と密に連携しながら多元的・包括的なモデリング・評価を行うことで、高精度なBVOC発生量推定を実現させる。
Support activities to promote plant-climate feedbacks

Grant number：23H04965 2023.4 - 2028.3

Grants-in-Aid for Scientific Research Grant-in-Aid for Transformative Research Areas (A)

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Authorship：Coinvestigator(s)
植物起源VOCs発生量の全球高精度推定とその大気化学・気候学的インパクト

Grant number：20H04320 2020.4 - 2024.3

基盤研究(B)

須藤健悟

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Authorship：Principal investigator Grant type：Competitive

Grant amount：\17160000 （ Direct Cost: \13200000 、 Indirect Cost：\3960000 ）

本研究では、大気化学・気候モデルCHASER(MIROC)および陸域生態系モデルVISITを組み合わせてBVOCs発生量の高精度推定を行う。まず、イソプレン類などのBVOCsのフラックス・濃度のデータにより、VISITのBVOCs放出量推定を検証する。次に、中間生成物であるホルムアルデヒド(HCHO)の全球分布を衛星観測データと比較することで、BVOCs計算を検証し、VISITの最適化を行う。最適化されたBVOCs放出量およびその変動の推定をCHASERによる大気化学・エアロゾル・気候の再現・予測実験に導入し、大気環境や気候の変動における、BVOCs変動の役割・インパクトを評価する。
Assessment on climate impacts of short-lived climate forcers by composition and region with hierarchical numerical models

Grant number：19H05669 2019.6 - 2024.3

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Authorship：Coinvestigator(s) Grant type：Competitive

Grant amount：\49010000 （ Direct Cost: \37700000 、 Indirect Cost：\11310000 ）
国際観測網と気候モデルによる有機エアロゾルの紫外可視光吸収特性に関する研究の推進

Grant number：19H04235 2019.4 - 2022.3

入江仁士

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Authorship：Coinvestigator(s)

Grant amount：\3900000 （ Direct Cost: \3000000 、 Indirect Cost：\900000 ）

実大気中の有機エアロゾルの光吸収特性に関する新たな定量的な観測的知見を得るとともに、その光吸収特性の変動要因を明らかにする。これは、大気科学、とりわけ気候変動研究において、有機エアロゾルの放射強制力の符号を負から正に変える「問い」に答えを与える極めて重要な研究である。その符号が正に変わると、現在の予測よりも温暖化が深刻化することになる。独自に世界展開している国際観測網を活用し、エアロゾル特性が明瞭に異なる５つもの主要な観測地点 (日本、タイ、インド)に焦点を当てる。全球化学気候モデル・衛星データも援用した研究体制で相乗的な研究成果を挙げ、有機エアロゾルの光吸収特性に関する研究を推進する。
本研究では、実大気中の有機エアロゾルの光吸収特性(340-870 nm)に関する新たな定量的な観測的知見（Aerosol Absorption Optical Depth (AAOD; 吸収エアロゾル光学的厚さ)やAbsorption Angstrom Exponent(AAE; 吸収オングストローム指数）)を得るとともに、その光吸収特性の変動要因を明らかにする。独自に世界展開している国際観測網を活用し、エアロゾル特性が明瞭に異なる５つもの主要な観測地点 (日本３地点、タイ１地点、インド１地点)に焦点を当てる。独自の紫外～可視の光吸収特性の長期連続観測技術、および、その変動要因の重要なフィンガープリントをもたらす有機ガス濃度等の観測技術の両方を世界で唯一有する本研究グループのみが可能な研究である。全球化学気候モデル・衛星データも援用した研究体制で相乗的な研究成果を挙げ、有機エアロゾルの光吸収特性に関する研究を推進する。
R01年度は、当該研究が対象とするユニークな５つの観測地点（千葉、福江島、春日、タイ・ピマイ、インド・パンテナガール）それぞれにおいて、必要な地上リモートセンシング観測装置（スカイラジオメーターとMAX-DOAS）を整備し、長期連続観測を開始した。しかしながら、うち２つの国際サイトいついては、新型コロナウイルスの影響のため、十分な現地でのメンテナンスができていない状況である。他方、本研究の全球化学気候モデル(CHASER)については、植物起源VOCsや二次有機エアロゾル（SOA）生成・消滅の計算スキームの改良・調整を行い、CHASER計算に不可欠な、揮発性有機化合物(VOCs)等のエミッションインベントリー等の整備も行った。変動要因解析に有用な他衛星データ(MODIS、OMI、TROPOMI等)、トラジェクトリー計算、FLEXPARTモデルの整備も進めた。
計画通り、当該研究が対象とするユニークな５つの観測地点（千葉、福江島、春日、タイ・ピマイ、インド・パンテナガール）それぞれにおいて、必要な地上リモートセンシング観測装置（スカイラジオメーターとMAX-DOAS）を整備し、長期連続観測を開始した。しかしながら、うち２つの国際サイトについては、新型コロナウイルスの影響のため、現地でのメンテナンスができていない状況である。他方、並行して、全球化学気候モデル(CHASER)の計算に不可欠な、揮発性有機化合物(VOCs)等のエミッションインベントリー等の整備を行った。変動要因解析に有用な他衛星データ(MODIS、OMI、TROPOMI等)、トラジェクトリー計算、FLEXPARTモデルの整備も進めた。以上より、おおむね順調に進展していると評価した。
本研究で対象とする５地点で長期連続観測を継続する。そのために、とりわけ２つの国際サイトについては、現地でのメンテナンスを早急に実施する。そのうえで、各地点において、AAODとAAEを定量的に見積もり、観測的知見を蓄積するとともに、先行研究との相違を明らかにする。エミッションとの関連については、比較的エアロゾルの変動要因が分かっている日本３地点のデータや過去データをリファレンスにし、ピマイやパンテナガールのAAODやAAEの高精度評価につなげる。複数年にわたる長期連続観測を活かし、AAODやAAEを様々な時間スケールで明らかにし、変動要因の解明を念頭に考察を行う。
また、MAX-DOAS観測をもとに、光吸収特性の変動要因のフィンガープリントをもたらすガス濃度や濃度比を算出する。有機エアロゾル、特にブラウンカーボンが高濃度となる大規模バイオマスバーニングでは、HCHOやCHOCHO等のガス濃度の増大やCHOCHO/HCHO濃度比の減少が起きることが分かっている。この情報に、衛星データ、トラジェクトリー、FLEXPARTの解析も加え高度な要因解析を実施する。加えて、観測で得られるガス・エアロゾルの濃度情報について、全球化学気候モデルCHASERを用いて、バイオマス燃焼等からの有機エアロゾルの発生起源・寄与を解析する。さらには、観測から得られたAAEで特定されたブラックカーボンとブラウンカーボンのイベントを比べ、両者の光吸収の強さを比較する。このようなエアロゾルの光学特性に関する新たな定量的な観測的知見を拘束条件とし、CHASERモデル内のパラメータを修正するなどして放射強制力の再評価を行い、これまでの知見（例えば、IPCC-AR5,6）からの更新として整理するなど、これまでに実現しなかった放射強制力の議論を行う。
Quantifying nitrate dynamics in hydrosphere using triple oxygen isotopes as tracers

Grant number：17H00780 2017.4 - 2021.3

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Authorship：Coinvestigator(s) Grant type：Competitive

Grant amount：\3120000 （ Direct Cost: \2400000 、 Indirect Cost：\720000 ）
Intense investigation of the oxidation capacity of global atmosphere and its changes

Grant number：16H02937 2016.4 - 2019.3

Sudo Kengo

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Authorship：Principal investigator

Grant amount：\18070000 （ Direct Cost: \13900000 、 Indirect Cost：\4170000 ）

This study improves the estimate of global distributions of hydroxy radical (OH) which controls oxidation and removal processes of various compounds in the atmosphere, and evaluates the recent change in the atmospheric oxidation capacity and its controlling mechanism. The estimate of OH distributions is improved by validating and elaborating the calculations of clouds, aerosols, and stratospheric ozone with combining a chemistry climate model simulation with the observational data as from satellite measurements. This study further investigates contributions of individual controlling factors of OH changes such as anthropogenic and natural emissions of nitrogen oxides (NOx), carbon monoxide (CO), volatile organic compounds (VOCs), in addition to the distributions of clouds, water vapor (H2O), and ozone.
Carbonaceous aerosols at Antarctic coasts: Transport from mid-latitudes and origins

Grant number：15H02806 2015.4 - 2019.3

Hara Keiichiro

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Authorship：Coinvestigator(s)

Measurements of carbonaceous aerosols were conducted in the Antarctic coasts and southern ocean. Black carbon (BC) concentrations at Syowa Station ranged in <0.2-63.8 ng m-3 (median, 1.8 ng m-3; mean, 2.7 ng m-3) in 2005-2016 and had maximum in September-October. No long-term trend of BC concentrations was clear during our measurement period. Seasonal features of EBC concentrations showed a maximum in September-October. BC was originated from biomass burning and combustion of fossil fuels in South America and southern Africa. BC at the Antarctic coasts were transported from South America and southern Africa mostly via lower troposphere and partly via upper troposphere and downward motion in the Antarctic Circle. The absorption Angstrom exponent (AAE) showed clear seasonal features and was associated with mixing states of BC and organic aerosols supplied from biomass burning and oceanic bio-activity.
Atmospheric composition data assimilation using multiple chemical transport models

Grant number：15K05296 2015.4 - 2018.3

MIYAZAKI Kazuyuki

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Authorship：Collaborating Investigator(s) (not designated on Grant-in-Aid)

We conducted tropospheric chemistry reanalysis calculations by assimilating multiple data sets from multiple satellite sensors. The reanalysis calculations were conducted using three different global chemical transport model and an ensemble Kalman filter technique that simultaneously optimises the chemical concentrations of various species and emissions of several precursors. The optimisation of both the concentration and the emission fields is an efficient method to correct the entire tropospheric profile and its year-to-year variations, and to adjust various tracers chemically linked to the species assimilated. Using the multiple chemical transport models, we demonstrated the importance of forecast model performance on tropospheric chemistry data assimilation.
大気化学・陸域生態系モデルの結合によるCH4・N2Oの変動要因の解明

2013.4 - 2016.3

科学研究費補助金基盤研究(A)

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Authorship：Principal investigator

本研究は、メタン（CH4）および亜酸化窒素（N2O）に焦点をあて、これらの大気中濃度の変動要因や収支について、全球規模での解明を行うものである。化学気候モデルと陸域生態系モデルによる結合シミュレーションやデータ同化・逆推定手法を主なアプローチとし、陸域生態系から大気へのCH4・N2O の放出（交換フラックス）、およびCH4・N2O の大気中での輸送や光化学的な消失等の推定を最大限に高精度化し、CH4・N2O の変動要因を網羅的に評価・整理する。窒素酸化物の沈着や有機炭素等の放出を通じた大気化学・気候と陸域生態系との相互作用にも着目し、CH4・N2O変動における役割を明らかにする。さらに、本研究で新たに得られるCH4・N2O 変動・収支の知見を土台として、IPCC 第5次報告書に準拠した将来予測計算を行い、各種放射強制力を再検討する。
Elucidating mechanism and factors of changes in CH4 and N2O by coupling of atmospheric chemistry and land ecosystem models

Grant number：25241006 2013.4 - 2016.3

SUDO KENGO

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Authorship：Principal investigator

Grant amount：\42640000 （ Direct Cost: \32800000 、 Indirect Cost：\9840000 ）

This study investigated global budget of atmospheric methane (CH4) and nitrous oxide (N2O), and inferred separate factors of their temporal changes. In the framework of a land-ecosystem and trance gas exchange model, estimations of global emissions of CH4, N2O, and biogenic VOCs were optimized. For the changes in OH which govern the CH4 sink in the atmosphere, individual controlling factors of OH changes were quantified and examined by a set of sensitivity simulations using an atmospheric chemistry model. More accurate estimation of global OH changes was also performed by our developed data assimilation system with the satellite measurements of global atmospheric chemistry. This study also investigated and tested N2O budget including emissions, photolysis, stratosphere-troposphere exchange (STE). Furthermore, underlying mechanisms and controlling factors of recent CH4 and N2O changes are revealed in detail by using past reproduction simulations (hindcasts) for CH4 and N2O.
全球化学輸送モデルによる大気汚染物質の長距離輸送とその変動メカニズムの解明

2009.4 - 2012.3

科学研究費補助金若手研究B 21710008

須藤健悟

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Authorship：Principal investigator

汚染物質の大陸間長距離輸送について、エミッション変動および気候変動の複合的な影響を定量化する。
Study of long-range transport of air pollutants and its changing mechanism using a chemistry coupled climate model

Grant number：21710008 2009 - 2011

SUDO Kengo

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Authorship：Principal investigator

Grant amount：\4550000 （ Direct Cost: \3500000 、 Indirect Cost：\1050000 ）

This study investigates long-range transport of air pollutants from major source regions and its changes during the past three decades, using a chemistry transport model with tagged tracers. Our model simulation suggests that long-term increases in ozone and aerosols including black carbon(BC) are largely attributed to the changes in anthropogenic emissions. Our study also reveals significant roles of long-term climate change as associated with the global warming in ozone changes in the tropics and southern hemisphere. In this study, changes in ozone distribution associated with climate change including ENSO are further analyzed by isolating impacts of transport and chemistry processes with a tagged tracer approach. Our results show that ozone changes associated with ENSO are mainly due to change in transport, while long-term ozone changes as with the recent warming are largely influenced by chemical processes. For BC in polar regions, we quantify individual contributions of increased long-range transport from South America, Africa, Europe, and North America. To validate the global model results, this study also investigates air quality in Asia and inflow of air pollutants to Asia using a regional air quality model(WRF-chem).
大気オゾン全球分布の変動過程：化学・気候モデルによる２０世紀再現実験

2006.4 - 2009.3

科学研究費補助金 18540439

須藤健悟

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Authorship：Principal investigator

過去の全球オゾン場の再現シミュレーション
Changing process of global ozone distribution : past reproduction with a chemistry coupled climate model

Grant number：18540439 2006 - 2008

SUDO Kengo

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Authorship：Principal investigator

Grant amount：\3970000 （ Direct Cost: \3400000 、 Indirect Cost：\570000 ）
気候変動・大気環境変化予測のための化学・エアロゾル結合気候モデルの開発

Grant number：16740275 2004 - 2005

須藤健悟

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Authorship：Principal investigator

Grant amount：\3100000 （ Direct Cost: \3100000 ）

これまでの作業によりエアロゾルシミュレーションが導入された化学気候モデル(CHASER)の開発が行われた。本年度はまずこのモデルにより現在に対する気候値(標準)実験を行い、特にオゾン(O_3)・OH・H_2O_2・アンモニア(HN_3)などの大気化学場との結びつきが強い硫酸塩エアロゾルについて欧州やアジア域の観測ネットワーク(EMEP等)や航空機観測(NASA-GTE)の各種データを用いて詳細な評価を行った。その結果本モデルは上部対流圏において硫酸塩濃度を10-50%過大評価する傾向にあるが、対流圏下層・地表付近の濃度については定量的にもよく観測を再現していることが確認された。その他のエアロゾル種(土壌ダスト、炭素性エアロゾル)のシミュレーション結果についてもエアロゾル観測ネットワーク(NASA-AERONET)と比較し評価を行った。また、このモデルを用いIPCC(気候変動に関する政府間パネル)の第4次報告書に向けたモデル間相互比較プロジェクトに参加し、対流圏オゾン変動による放射強制力の計算結果を当プロジェクトに提供し詳細な議論を行った(Gauss et al., 2006)。さらに本エアロゾル・化学気候モデルを用い産業革命以前から現在までの対流圏オゾンとエアロゾルの各変動が及ぼす放射強制力(エアロゾルば直接効果のみ)の計算を行った。本計算では対流圏オゾン増加による放射強制力として全球平均で0.48W・m^<-2>(長波:0.4、短波:0.08W・m^<-2>)の値が得られ、エアロゾルの放射強制力としては黒色(無機)炭素+0.40W・m^<-2>、有機炭素-0.24W・m^<-2>、硫酸塩-0.28W・m^<-2>となり、黒色炭素による大気加熱の効果は有機炭素や硫酸塩による冷却効果により全て打ち消されることが分かった。今後はエアロゾルの雲・降水を介した間接効果の見積もりが検討課題である。

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To the head of KAKENHI (Grants-in-Aid for Scientific Research).▲

Teaching Experience (On-campus) 62

Global and Urban Warmings

2021
Seminar on Climate Science 2C

2021
Seminar on Climate Science 2A

2021
Seminar on Climate Science 1C

2021
Seminar on Climate Science 1A

2021
Atmospheric Physics and Chemistry

2021
Seminar on Climate Science 2E

2021
Seminar on Climate Science 1E

2021
Seminar on Climate Science 2D

2021
Seminar on Climate Science 2B

2021
Seminar on Climate Science 1D

2021
Seminar on Climate Science 1B

2021
Geophysics and Planetary Physics Experiments I

2021
Fundamentals of Atmospheric and Hydrospheric Sciences

2021
Seminar on Climate Science 2F

2021
Seminar on Climate Science 1F

2021
First Year Seminar A

2020
Climate science

2020
Geophysics and Planetary Physics Experiments I

2020
Fundamentals of Atmospheric and Hydrospheric Sciences

2020
Seminar on Climate Science 2D

2020
Seminar on Climate Science 2C

2020
Seminar on Climate Science 2B

2020
Seminar on Climate Science 2A

2020
Seminar on Climate Science 1D

2020
Seminar on Climate Science 1C

2020
Seminar on Climate Science 1B

2020
Seminar on Climate Science 1A

2020
Atmospheric Physics and Chemistry

2020
Seminar on Climate Science 2F

2020
Seminar on Climate Science 2E

2020
Seminar on Climate Science 1F

2020
Seminar on Climate Science 1E

2020
Climate Science

2016
大気物理化学

2016
Climate Science

2015
大気物理化学

2015
Climate Science

2014
大気物理化学

2014
Climate Science

2013
Atmospheric Physics and Chemistry

2013
Climate Science

2012
地球環境変動論

2012
Atmospheric Physics and Chemistry

2012
Climate Science

2011
地球環境変動論

2011
大気物理化学

2011
基礎セミナーＢ

2010
Atmospheric Chemistry and Physics

2010
地球惑星システム学特論Ⅱ

2010
地球水循環学

2010
気候科学

2010
Climate Science

2010
大気物理化学

2010
Climate Science

2009
Atmospheric Physics and Chemistry

2009
Atmospheric Physics and Chemistry

2008
基礎セミナーＡ

2008
大気物理化学

2008
Basic Seminar A

2007
Atmospheric Physics and Chemistry

2007
Aerosol Physics

2006

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To the head of Teaching Experience (On-campus).▲

Teaching Experience (Off-campus) 2

物質科学各論

2022.6 - 2022.7 （Nagoya City University）

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Level：Undergraduate (specialized) Country：Japan
化学環境学特別講義第３

2008.4 - 2009.3 （東京工業大学）

To the head of Teaching Experience (Off-campus).▲

Social Contribution 10

～最新科学が教える気候変動問題の真実～気候変動・温暖化研究の最前線

Role(s)：Lecturer,　Advisor,　Informant

中京テレビ社内セミナー（TERAGOYA） 2023.3
短寿命大気成分（SLCPs）から考える気候変動と温暖化緩和策

Role(s)：Lecturer

あいちゼロカーボン推進協議会気候変動をもたらす要因、気候変動がもたらす未来 2022.10
ノーベル賞特別講演会：コンピュータ上に作るもう一つの地球

Role(s)：Lecturer

名古屋大学ノーベル賞特別講演会：コンピュータ上に作るもう一つの地球 2021.11
グローバルな大気環境・気候変動の研究(多治見北高校)

Role(s)：Lecturer

多治見北高校２年生TKt　Exploration Day with Researchers Ⅱ 2021.11
大気環境気候モデリング研究室紹介：中日新聞

Role(s)：Media coverage

中日新聞朝刊 2021.10
ノーベル物理学賞（真鍋淑郎氏）解説：名古屋テレビ・アップ

Role(s)：Appearance,　Commentator,　Media coverage

名古屋テレビアップ（夕方報道番組） 2021.10
ノーベル物理学賞（真鍋淑郎氏）解説:TBSテレビ・ひるおび

Role(s)：Media coverage

TBSテレビひるおび 2021.10
ノーベル物理学賞（真鍋淑郎氏）解説:東海テレビ・ニュースone

Role(s)：Appearance,　Media coverage

東海テレビニュースOne 2021.10
ノーベル物理学賞（真鍋淑郎氏）解説

Role(s)：Appearance,　Commentator,　Media coverage

名古屋大学ノーベル物理学賞（真鍋淑郎氏）会見 2021.10
【プレスリリース】ロックダウンによる汚染物質変動：読売新聞（全国）

Role(s)：Media coverage

読売新聞（全国紙）朝刊 2021.8

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To the head of Social Contribution.▲

Media Coverage 8

大気環境気候モデリング研究室紹介：中日新聞 Newspaper, magazine

中日新聞朝刊 2021.10

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Author：Myself
ノーベル物理学賞（真鍋淑郎氏）解説:中日新聞 Newspaper, magazine

中日新聞朝刊 2021.10

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Author：Myself
ノーベル物理学賞（真鍋淑郎氏）解説:TBSテレビ・ひるおび TV or radio program

TBSテレビひるおび 2021.10

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Author：Myself
ノーベル物理学賞（真鍋淑郎氏）解説：福岡RKBラジオ TV or radio program

RKBラジオよなおし堂「今日のフカボリ」コーナーにて解説 2021.10
ノーベル物理学賞（真鍋淑郎氏）解説：名古屋テレビ・アップ TV or radio program

名古屋テレビアップ（夕方報道番組） 2021.10

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Author：Myself
ノーベル物理学賞（真鍋淑郎氏）解説:東海テレビ・ニュースone TV or radio program

東海テレビニュースOne 2021.10

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Author：Myself
ノーベル物理学賞（真鍋淑郎氏）会見:TBSニュース TV or radio program

TBSテレビ生放送会見 2021.10

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Author：Myself
【プレスリリース】ロックダウンによる汚染物質変動：読売新聞（全国） Newspaper, magazine

読売新聞（全国紙） 2021年8月2日朝刊 2021.8

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To the head of Media Coverage.▲

Academic Activities 1

日本学術振興会特別研究員等審査会専門委員（外国人） International contribution

Role(s)：Review, evaluation

日本学術振興会 2020.5 - 2020.7

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Type：Scientific advice/Review

To the head of Academic Activities.▲