2022/03/28 更新

写真a

マツイ ヒトシ
松井 仁志
MATSUI Hitoshi
所属
大学院環境学研究科 地球環境科学専攻 気候科学 准教授
大学院担当
大学院環境学研究科
学部担当
理学部 地球惑星科学科
職名
准教授

学位 1

  1. 博士(理学) ( 2009年3月   東京大学 ) 

研究キーワード 4

  1. 数値モデル開発・計算

  2. 気候変動

  3. 大気環境

  4. エアロゾル

研究分野 2

  1. 環境・農学 / 環境動態解析

  2. 自然科学一般 / 大気水圏科学

現在の研究課題とSDGs 5

  1. 地球規模でのエアロゾルと気候(放射・雲・雪氷・生態系)との相互作用に関する研究

  2. エアロゾルの半球規模の輸送過程に関する研究

  3. エアロゾルの生成・変質・除去過程に関する研究

  4. エアロゾル・大気化学に関する数値モデル開発

  5. 都市域における大気汚染に関する研究

経歴 2

  1. 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   准教授

    2020年4月 - 現在

  2. 名古屋大学   大学院環境学研究科 地球環境科学専攻 地球環境変動論   助教

    2015年4月 - 2020年3月

所属学協会 4

  1. 日本気象学会

  2. 日本大気化学会

  3. 日本地球惑星科学連合

  4. American Geophysical Union

受賞 2

  1. 日本気象学会正野賞

    2014年11月   日本気象学会  

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    受賞区分:国内学会・会議・シンポジウム等の賞  受賞国:日本国

  2. 日本大気化学会奨励賞

    2014年11月   日本大気化学会  

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    受賞区分:国内学会・会議・シンポジウム等の賞  受賞国:日本国

 

論文 66

  1. Soluble salts in deserts as a source of sulfate aerosols in an Antarctic ice core during the last glacial period 査読有り

    Uemura R., Masaka K., Iizuka Y., Hirabayashi M., Matsui H., Matsumoto R., Uemura M., Fujita K., Motoyama H.

    Earth and Planetary Science Letters   578 巻   2022年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Earth and Planetary Science Letters  

    Chemical proxy data from ice cores provide information for understanding environmental changes. Despite large climate shifts, the flux of sulfate onto the ice in Antarctica has remained relatively stable over glacial-interglacial cycles. However, the mechanism behind the stable flux is controversial because of a lack of evidence for changes in multiple source emissions. Here, we present the sulfur isotopic record in the Antarctic Dome Fuji ice core, which provides a new constraint on the interpretation of sulfate aerosols. During the Last Glacial Maximum (LGM), the sulfur isotope ratio was depleted compared to that during the Holocene and was negatively correlated with terrestrial contributions. The isotope data suggest that the contributions from terrestrial gypsum were enhanced during the LGM. A potential source area for gypsum in the Antarctic ice core is the high-altitude region around the Atacama Desert, although other regions cannot be excluded. These results suggest that the salts in deserts should be considered a terrestrial source of Antarctic sulfate during the LGM.

    DOI: 10.1016/j.epsl.2021.117299

    Scopus

  2. Arctic black carbon during PAMARCMiP 2018 and previous aircraft experiments in spring 査読有り 国際共著

    Ohata Sho, Koike Makoto, Yoshida Atsushi, Moteki Nobuhiro, Adachi Kouji, Oshima Naga, Matsui Hitoshi, Eppers Oliver, Bozem Heiko, Zanatta Marco, Herber Andreas B.

    ATMOSPHERIC CHEMISTRY AND PHYSICS   21 巻 ( 20 ) 頁: 15861 - 15881   2021年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Atmospheric Chemistry and Physics  

    Vertical profiles of the mass concentration of black carbon (BC) were measured at altitudes up to 5 km during the PAMARCMiP (Polar Airborne Measurements and Arctic Regional Climate Model simulation Project) aircraft-based field experiment conducted around the northern Greenland Sea (Fram Strait) during March and April 2018 from operation base Station Nord (81.6'N, 16.7'W). Median BC mass concentrations in individual altitude ranges were 7-18 ng m-3 at standard temperature and pressure at altitudes below 4.5 km. These concentrations were systematically lower than previous observations in the Arctic in spring, conducted by ARCTAS-A in 2008 and NETCARE in 2015, and similar to those observed during HIPPO3 in 2010. Column amounts of BC for altitudes below 5 km in the Arctic (>66.5'N; COLBC), observed during the ARCTAS-A and NETCARE experiments, were higher by factors of 4.2 and 2.7, respectively, than those of the PAMARCMiP experiment. These differences could not be explained solely by the different locations of the experiments. The year-to-year variation of COLBC values generally corresponded to that of biomass burning activities in northern midlatitudes over western and eastern Eurasia. Furthermore, numerical model simulations estimated the year-to-year variation of contributions from anthropogenic sources to be smaller than 30 %-40 %. These results suggest that the year-to-year variation of biomass burning activities likely affected BC amounts in the Arctic troposphere in spring, at least in the years examined in this study. The year-to-year variations in BC mass concentrations were also observed at the surface at high Arctic sites Ny-Ålesund and Utqiävik (formerly known as Barrow, the location of Barrow Atmospheric Baseline Observatory), although their magnitudes were slightly lower than those in COLBC. Numerical model simulations in general successfully reproduced the observed COLBC values for PAMARCMiP and HIPPO3 (within a factor of 2), whereas they markedly underestimated the values for ARCTAS-A and NETCARE by factors of 3.7-5.8 and 3.3-5.0, respectively. Because anthropogenic contributions account for nearly all of the COLBC (82 %-98 %) in PAMARCMiP and HIPPO3, the good agreement between the observations and calculations for these two experiments suggests that anthropogenic contributions were generally well reproduced. However, the significant underestimations of COLBC for ARCTAS-A and NETCARE suggest that biomass burning contributions were underestimated. In this study, we also investigated plumes with enhanced BC mass concentrations, which were affected by biomass burning emissions, observed at 5 km altitude. Interestingly, the mass-averaged diameter of BC (core) and the shell-to-core diameter ratio of BC-containing particles in the plumes were generally not very different from those in other air samples, which were considered to be mostly aged anthropogenic BC. These observations provide a useful basis to evaluate numerical model simulations of the BC radiative effect in the Arctic region in spring.

    DOI: 10.5194/acp-21-15861-2021

    Web of Science

    Scopus

  3. High sensitivity of Asian dust emission, transport, and climate impacts to threshold friction velocity 査読有り

    Kawai, K., *H. Matsui, R. Kimura, and M. Shinoda

    Scientific Online Letters on the Atmosphere     2021年11月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

  4. Aerosol absorption in global models from AeroCom phase III 査読有り 国際共著

    Sand Maria, Samset Bjorn H., Myhre Gunnar, Gliss Jonas, Bauer Susanne E., Bian Huisheng, Chin Mian, Checa-Garcia Ramiro, Ginoux Paul, Kipling Zak, Kirkevag Alf, Kokkola Harri, Le Sager Philippe, Lund Marianne T., Matsui Hitoshi, van Noije Twan, Olivie Dirk J. L., Remy Samuel, Schulz Michael, Stier Philip, Stjern Camilla W., Takemura Toshihiko, Tsigaridis Kostas, Tsyro Svetlana G., Watson-Parris Duncan

    ATMOSPHERIC CHEMISTRY AND PHYSICS   21 巻 ( 20 ) 頁: 15929 - 15947   2021年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Atmospheric Chemistry and Physics  

    Aerosol-induced absorption of shortwave radiation can modify the climate through local atmospheric heating, which affects lapse rates, precipitation, and cloud formation. Presently, the total amount of aerosol absorption is poorly constrained, and the main absorbing aerosol species (black carbon (BC), organic aerosols (OA), and mineral dust) are diversely quantified in global climate models. As part of the third phase of the Aerosol Comparisons between Observations and Models (AeroCom) intercomparison initiative (AeroCom phase III), we here document the distribution and magnitude of aerosol absorption in current global aerosol models and quantify the sources of intermodel spread, highlighting the difficulties of attributing absorption to different species. In total, 15 models have provided total present-day absorption at 550nm (using year 2010 emissions), 11 of which have provided absorption per absorbing species. The multi-model global annual mean total absorption aerosol optical depth (AAOD) is 0.0054 (0.0020 to 0.0098; 550nm), with the range given as the minimum and maximum model values. This is 28% higher compared to the 0.0042 (0.0021 to 0.0076) multi-model mean in AeroCom phase II (using year 2000 emissions), but the difference is within 1 standard deviation, which, in this study, is 0.0023 (0.0019 in Phase II). Of the summed component AAOD, 60% (range 36%-84%) is estimated to be due to BC, 31% (12%-49%) is due to dust, and 11% (0%-24%) is due to OA; however, the components are not independent in terms of their absorbing efficiency. In models with internal mixtures of absorbing aerosols, a major challenge is the lack of a common and simple method to attribute absorption to the different absorbing species. Therefore, when possible, the models with internally mixed aerosols in the present study have performed simulations using the same method for estimating absorption due to BC, OA, and dust, namely by removing it and comparing runs with and without the absorbing species. We discuss the challenges of attributing absorption to different species; we compare burden, refractive indices, and density; and we contrast models with internal mixing to models with external mixing. The model mean BC mass absorption coefficient (MAC) value is 10.1 (3.1 to 17.7)m2g-1 (550nm), and the model mean BC AAOD is 0.0030 (0.0007 to 0.0077). The difference in lifetime (and burden) in the models explains as much of the BC AAOD spread as the difference in BC MAC values. The difference in the spectral dependency between the models is striking. Several models have an absorption Ångstrøm exponent (AAE) close to 1, which likely is too low given current knowledge of spectral aerosol optical properties. Most models do not account for brown carbon and underestimate the spectral dependency for OA.

    DOI: 10.5194/acp-21-15929-2021

    Web of Science

    Scopus

  5. Importance of supersaturation in Arctic black carbon simulations 査読有り 国際誌

    Matsui H., Liu M.

    Journal of Climate   34 巻 ( 19 ) 頁: 7843 - 7856   2021年10月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Climate  

    Black carbon (BC) aerosol particles in the Arctic heat the atmosphere and snow/ice surfaces and may strengthen the snow-albedo feedback that amplifies Arctic warming. Model simulations of BC concentrations in the Arctic depend strongly on the representation of microphysical processes such as aging, activation, and wet removal. Most BC modeling studies have classified BC particles into hydrophobic BC, which cannot form cloud droplets, and hydrophilic BC, which can form cloud droplets, by assuming a globally constant critical supersaturation threshold value (Sthre), without considering its consistency with cloud maximum supersaturation (Smax). Here we show that it is essential to consider the consistency of Sthre with Smax in global model simulations to reduce uncertainties in near-surface ambient BC concentrations in the Arctic. Previous studies often obtained good agreement between simulated and observed near-surface Arctic BC mass concentrations when a low Sthre (;0.1%) was assumed in their models. However, this Sthre may be too low (activation and wet removal of BC may be underestimated) for the Arctic, because some recent observations and our model simulations suggest that Smax may actually be higher (;0.3%) there. We also demonstrate that spatially varying Sthre values and their consistency with Smax, which previous studies did not consider, must be represented in models for more accurate estimation of BC budget in the Arctic. Because both Smax and BC-aging speed depend on climatic conditions, our findings are an important step toward better simulations of BC impacts on past, present, and future Arctic climates.

    DOI: 10.1175/JCLI-D-20-0994.1

    Scopus

  6. Understanding Top-of-Atmosphere Flux Bias in the AeroCom Phase III Models: A Clear-Sky Perspective 査読有り 国際共著 国際誌

    Su Wenying, Liang Lusheng, Myhre Gunnar, Thorsen Tyler J., Loeb Norman G., Schuster Gregory L., Ginoux Paul, Paulot Fabien, Neubauer David, Checa-Garcia Ramiro, Matsui Hitoshi, Tsigaridis Kostas, Skeie Ragnhild B., Takemura Toshihiko, Bauer Susanne E., Schulz Michael

    JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS   13 巻 ( 9 )   2021年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Advances in Modeling Earth Systems  

    Biases in aerosol optical depths (AOD) and land surface albedos in the AeroCom models are manifested in the top-of-atmosphere (TOA) clear-sky reflected shortwave (SW) fluxes. Biases in the SW fluxes from AeroCom models are quantitatively related to biases in AOD and land surface albedo by using their radiative kernels. Over ocean, AOD contributes about 25% to the (Formula presented.) S– (Formula presented.) N mean SW flux bias for the multi-model mean (MMM) result. Over land, AOD and land surface albedo contribute about 40% and 30%, respectively, to the (Formula presented.) S– (Formula presented.) N mean SW flux bias for the MMM result. Furthermore, the spatial patterns of the SW flux biases derived from the radiative kernels are very similar to those between models and CERES observation, with the correlation coefficient of 0.6 over ocean and 0.76 over land for MMM using data of 2010. Satellite data used in this evaluation are derived independently from each other, consistencies in their bias patterns when compared with model simulations suggest that these patterns are robust. This highlights the importance of evaluating related variables in a synergistic manner to provide an unambiguous assessment of the models, as results from single parameter assessments are often confounded by measurement uncertainty. Model biases in land surface albedos can and must be corrected to accurately calculate TOA flux. We also compare the AOD trend from three models with the observation-based counterpart. These models reproduce all notable trends in AOD except the decreasing trend over eastern China and the adjacent oceanic regions due to limitations in the emission data set.

    DOI: 10.1029/2021MS002584

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    Scopus

  7. High Potential of Asian Dust to Act as Ice Nucleating Particles in Mixed-Phase Clouds Simulated With a Global Aerosol-Climate Model 査読有り 国際誌

    Kawai Kei, Matsui Hitoshi, Tobo Yutaka

    JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   126 巻 ( 12 )   2021年6月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Geophysical Research: Atmospheres  

    Mineral dust affects the microphysical and radiative properties of mixed-phase clouds and hence the radiative balance of the Earth by acting as ice nucleating particles (INPs). However, the importance of Asian dust as INPs is not well understood. In this study, we examined the contribution of Asian dust to global dust INPs and its effect on cloud radiative forcing (CRF) using a global aerosol-climate model with an ice nucleation parameterization that links INP number concentrations to ambient temperature and dust number concentrations. Our model well reproduces INP number concentrations measured over the Tokyo Metropolitan area in Japan during May 2017, when Asian dust was transported to Japan. Our simulation for the years 2013–2017 shows that Asian dust extends from its source regions (e.g., the Gobi and Taklimakan Deserts) to the North Pacific, North America, and the Arctic. Notably, Asian dust is transported to higher altitudes (i.e., to temperature regimes relevant for the formation of mixed-phase clouds) more efficiently than dust from other regions. The annual-mean simulated contribution of Asian dust to global dust INPs is 15%, which is 4.4 times higher than its contribution to global atmospheric dust loading (3.4%). These characteristics of Asian dust show its high potential to act as INPs in mixed-phase clouds. Sensitivity simulations show that Asian dust INPs have a positive net CRF of 0.054–0.19 W m−2 in East Asia and the North Pacific during 2013–2017 (cf. 0.092–1.0 W m−2 for dust from other regions).

    DOI: 10.1029/2020JD034263

    Web of Science

    Scopus

  8. Seasonal Variation of Wet Deposition of Black Carbon at Ny-Alesund, Svalbard 査読有り 国際共著 国際誌

    Mori Tatsuhiro, Kondo Yutaka, Ohata Sho, Goto-Azuma Kumiko, Fukuda Kaori, Ogawa-Tsukagawa Yoshimi, Moteki Nobuhiro, Yoshida Atsushi, Koike Makoto, Sinha P. R., Oshima Naga, Matsui Hitoshi, Tobo Yutaka, Yabuki Masanori, Aas Wenche

    JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   126 巻 ( 12 )   2021年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Geophysical Research: Atmospheres  

    Black carbon (BC) aerosol deposited in and onto Arctic snow increases the snow's absorption of solar radiation and accelerates snowmelt. Concentrations of BC in the Arctic atmosphere and snow are controlled by wet deposition; however, details of this process are poorly understood owing to the scarcity of time-resolved measurements of BC in hydrometeors. We measured mass concentrations of BC in hydrometeors (CMBC) and in air (MBC) with 16% and 15% accuracies, respectively, at Ny-Ålesund, Svalbard during 2012–2019. Median monthly MBC and CMBC values showed similar seasonal variations, being high in winter-spring and low in summer. Median monthly BC wet deposition mass flux (FMBC) was highest in winter and lowest in summer, associated with seasonal patterns of CMBC and precipitation. Seasonally averaged BC size distributions in hydrometeors were similar except for summer. Measurements of MBC and CMBC in spring 2017 showed a size-independent removal efficiency, indicating that BC-containing particles were efficiently activated into cloud droplets. These observations at Ny-Ålesund were compared with observations at Barrow, Alaska, during 2013–2017. The near-surface MBC at Ny-Ålesund and Barrow had similar seasonal patterns; however, the two sites differed in CMBC and FMBC. In summer, CMBC was low at Ny-Ålesund but moderate at Barrow, likely reflecting differences in MBC in the lower troposphere. Seasonally averaged BC size distributions in hydrometeors were similar at both sites, suggesting that average BC size distributions are similar in the Arctic lower troposphere. The efficiency of BC removal tends to be size-independent during transport, leading to the observed similarity.

    DOI: 10.1029/2020JD034110

    Web of Science

    Scopus

  9. Aerosol radiative forcings induced by substantial changes in anthropogenic emissions in China from 2008 to 2016 査読有り 国際誌

    Liu Mingxu, Matsui Hitoshi

    ATMOSPHERIC CHEMISTRY AND PHYSICS   21 巻 ( 8 ) 頁: 5965 - 5982   2021年4月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Atmospheric Chemistry and Physics  

    Anthropogenic emissions in China play an important role in altering the global radiation budget. Over the past decade, the strong clean-Air policies in China have resulted in substantial reductions of anthropogenic emissions of sulfur dioxide (SO2) and primary particulate matter, and air quality in China has consequently improved. However, the resultant aerosol radiative forcings have been poorly understood. In this study, we used an advanced global climate model integrated with the latest localized emission inventory to quantify the aerosol radiative forcings by the changes of anthropogenic emissions in China between 2008 and 2016. By comparing with multiple observation datasets, our simulations reproduced the considerable reductions of sulfate and black carbon (BC) mass loadings reasonably well over eastern China (the key region subject to stringent emission controls) during the period and accordingly showed a clear decline in both aerosol optical depth and absorption aerosol optical depth. The results revealed a regional annual mean positive direct radiative forcing (DRF) of C0.29Wm2 at the top of the atmosphere (TOA) due to the reduction of SO2 emissions. This positive aerosol radiative forcing was comprised of diminished sulfate scattering (C0.58Wm2), enhanced nitrate radiative effects (0.29Wm2), and could be completely offset by the concurrent reduction of BC emissions that induced a negative BC DRF of 0.33Wm2. Despite the small net aerosol DRF (0.05Wm2) at the TOA, aerosol radiation interactions could explain the surface brightening in China over the past decade. The overall reductions in aerosol burdens and associated optical effects mainly from BC and sulfate enhanced the regional annual mean downward solar radiation flux at the surface by C1.0Wm2 between 2008 and 2016. The enhancement was in general agreement with a long-Term observational record of surface energy fluxes in China. We also estimated that aerosol effects on cloud radiative forcings may have played a dominant role in the net aerosol radiative forcings at the TOA in China and over the northern Pacific Ocean during the study period. This study will facilitate more informed assessment of climate responses to projected emissions in the future as well as to sudden changes in human activities (e.g., the COVID-19 lockdown).

    DOI: 10.5194/acp-21-5965-2021

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    Scopus

  10. Constraining the atmospheric limb of the plastic cycle 査読有り 国際共著 国際誌

    Brahney Janice, Mahowald Natalie, Prank Marje, Cornwell Gavin, Klimont Zbigniew, Matsui Hitoshi, Prather Kimberly Ann

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   118 巻 ( 16 )   2021年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Proceedings of the National Academy of Sciences of the United States of America  

    Plastic pollution is one of the most pressing environmental and social issues of the 21st century. Recent work has highlighted the atmosphere's role in transporting microplastics to remote locations [S. Allen et al., Nat. Geosci. 12, 339 (2019) and J. Brahney, M. Hallerud, E. Heim, M. Hahnenberger, S. Sukumaran, Science 368, 1257-1260 (2020)]. Here, we use in situ observations of microplastic deposition combined with an atmospheric transport model and optimal estimation techniques to test hypotheses of the most likely sources of atmospheric plastic. Results suggest that atmospheric microplastics in the western United States are primarily derived from secondary re-emission sources including roads (84%), the ocean (11%), and agricultural soil dust (5%). Using our best estimate of plastic sources and modeled transport pathways, most continents were net importers of plastics from the marine environment, underscoring the cumulative role of legacy pollution in the atmospheric burden of plastic. This effort uses high-resolution spatial and temporal deposition data along with several hypothesized emission sources to constrain atmospheric plastic. Akin to global biogeochemical cycles, plastics now spiral around the globe with distinct atmospheric, oceanic, cryospheric, and terrestrial residence times. Though advancements have been made in the manufacture of biodegradable polymers, our data suggest that extant nonbiodegradable polymers will continue to cycle through the earth's systems. Due to limited observations and understanding of the source processes, there remain large uncertainties in the transport, deposition, and source attribution of microplastics. Thus, we prioritize future research directions for understanding the plastic cycle.

    DOI: 10.1073/pnas.2020719118

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    PubMed

  11. Global-scale constraints on light-absorbing anthropogenic iron oxide aerosols 査読有り 国際共著 国際誌

    Lamb K. D., Matsui H., Katich J. M., Perring A. E., Spackman J. R., Weinzierl B., Dollner M., Schwarz J. P.

    NPJ CLIMATE AND ATMOSPHERIC SCIENCE   4 巻 ( 1 )   2021年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:npj Climate and Atmospheric Science  

    Anthropogenic iron oxide aerosols (FeOx) have been identified as a climatically significant atmospheric light absorber, and as a contributor of free iron to the oceans. Here we provide global-scale constraints on their atmospheric abundance with measurements over the remote Pacific and Atlantic Oceans from aircraft campaigns spanning 10 years. We find FeOx-like aerosols are transported far from source regions with similar efficiency as black carbon particles. Strong contrast in concentrations was observed between the Northern and Southern Hemisphere Pacific. We provide observational constraints in remote regions on the ambient ratios of FeOx relative to BC from fossil fuel burning. Comparison with a global aerosol model tuned to recent observations in East-Asian source regions confirm an upward revision of emissions based on model/observation comparison over the Pacific receptor region. We find that anthropogenic FeOx-like particles generate global-scale shortwave atmospheric heating 0.3–26% of that of black carbon in remote regions where concentrations of both aerosols are very low.

    DOI: 10.1038/s41612-021-00171-0

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  12. Studies on Arctic aerosols and clouds during the ArCS project 査読有り 国際誌

    Koike M., Goto-Azuma K., Kondo Y., Matsui H., Mori T., Moteki N., Ohata S., Okamoto H., Oshima N., Sato K., Takano T., Tobo Y., Ukita J., Yoshida A.

    POLAR SCIENCE   27 巻   2021年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Polar Science  

    Aerosols and clouds play important roles in the Arctic climate. Conversely, aerosol emissions and cloud formation are affected by changes in the Arctic climate. This paper reviews studies of aerosols and clouds performed during the Arctic Challenge for Sustainability (ArCS) project carried out by the National Institute of Polar Research (NIPR) in Japan and collaborating institutions. The ArCS project included intensive studies of black carbon aerosols (BC). We installed Continuous Soot Monitoring System (COSMOS) instruments to measure atmospheric BC at four locations in the Arctic, establishing the Arctic BC COSMOS Measurement Network (ABCM-net). We also measured BC concentrations in snowpack in extensive areas of the Arctic and showed that previous studies have greatly overestimated BC in snowpack. We developed and improved new aerosol models that achieved better agreements with measurements of BC in the Arctic atmosphere, snowpack, and falling snow. We made new estimates of radiative forcing of BC in the Arctic atmosphere and snow/ice surfaces that lower their albedo. In addition to these researches on BC, we made accurate measurements of ice nucleating particles (INPs) at Ny-Ålesund, Svalbard, showing that their concentrations increased in summer as a result of dust particle emissions from glacial outwash sediments. This high ice nucleating ability was likely due to the presence of organic substances mixed with the dust particles. We also made continuous cloud radar measurements and the first continuous in-situ measurements of cloud microphysical properties in the Arctic at Ny-Ålesund. Results from these cloud measurements and their relationship with aerosols are described.

    DOI: 10.1016/j.polar.2020.100621

    Web of Science

    Scopus

  13. Improved Simulations of Global Black Carbon Distributions by Modifying Wet Scavenging Processes in Convective and Mixed-Phase Clouds 査読有り 国際誌

    Liu Mingxu, Matsui Hitoshi

    JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   126 巻 ( 3 )   2021年2月

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    担当区分:最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Geophysical Research: Atmospheres  

    In-cloud wet scavenging dominates the wet removal of aerosols in the atmosphere, but is not well represented in climate models. Aircraft measurements of black carbon (BC) concentrations suggest that models commonly overestimate BC concentrations in the upper troposphere of the tropics by more than one order of magnitude but underestimate BC burdens in polar latitudes. In this study, we improved the in-cloud wet scavenging parameterizations for convective clouds and mixed-phase clouds to better characterize BC abundances in the remote atmosphere (remote oceans and polar regions) with a global model, CAM5-ATRAS2. The modified wet scavenging processes in the model achieved a more realistic simulation of BC concentrations over both the tropics and the Arctic. The new, unified scheme for vertical transport and wet removal during deep convection generally reproduced the observed low mixing ratios (about 0.1 ng kg−1) of BC in the middle and upper troposphere over the tropics, and the Wegener–Bergeron–Findeisen process (WBF) lowered the wet removal efficiency of BC from mixed-phase clouds and consequently increased BC burdens in the Arctic by about a factor of 2. The BC direct radiative forcings increased by 20% globally (from 0.26 to 0.31 W m−2), and more importantly by a factor of 2 in the Arctic (from 0.09 to 0.18 W m−2). Our results indicated that good agreement between modeled and observed BC concentrations could be obtained in the remote atmosphere without requiring the relatively short global BC lifetime (∼4 days) suggested by previous studies.

    DOI: 10.1029/2020JD033890

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  14. Aerosol absorption in global models from AeroCom Phase III 国際共著 国際誌

    Sand, M., Samset, B. H., Myhre, G., Gliss, J., Bauer, S. E., Bian, H., Chin, M., Checa-Garcia, R., Ginoux, P., Kipling, Z., Kirkevag, A., Kokkola, H., Le Sagar, P., Lund, M. T., Matsui, H., van Noije, T., Remy, S., Schulz, M., Stier, P., Stjern, C. W., Takemura, T., Tsigaridis, K., Tsyro, S. G., Watson-Parris, D.

    ATMOSPHERIC CHEMISTRY AND PHYSICS DISCUSSIONS     2021年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

  15. AeroCom phase III multi-model evaluation of the aerosol life cycle and optical properties using ground- and space-based remote sensing as well as surface in situ observations 査読有り 国際共著 国際誌

    Gliss Jonas, Mortier Augustin, Schulz Michael, Andrews Elisabeth, Balkanski Yves, Bauer Susanne E., Benedictow Anna M. K., Bian Huisheng, Checa-Garcia Ramiro, Chin Mian, Ginoux Paul, Griesfeller Jan J., Heckel Andreas, Kipling Zak, Kirkevag Alf, Kokkola Harri, Laj Paolo, Le Sager Philippe, Lund Marianne Tronstad, Myhre Cathrine Lund, Matsui Hitoshi, Myhre Gunnar, Neubauer David, van Noije Twan, North Peter, Olivi Dirk J. L., Remy Samuel, Sogacheva Larisa, Takemura Toshihiko, Tsigaridis Kostas, Tsyro Svetlana G.

    ATMOSPHERIC CHEMISTRY AND PHYSICS   21 巻 ( 1 ) 頁: 87 - 128   2021年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Atmospheric Chemistry and Physics  

    Within the framework of the AeroCom (Aerosol Comparisons between Observations and Models) initiative, the state-of-the-art modelling of aerosol optical properties is assessed from 14 global models participating in the phase III control experiment (AP3). The models are similar to CMIP6/AerChemMIP Earth System Models (ESMs) and provide a robust multi-model ensemble. Inter-model spread of aerosol species lifetimes and emissions appears to be similar to that of mass extinction coefficients (MECs), suggesting that aerosol optical depth (AOD) uncertainties are associated with a broad spectrum of parameterised aerosol processes. Total AOD is approximately the same as in AeroCom phase I (AP1) simulations. However, we find a 50 % decrease in the optical depth (OD) of black carbon (BC), attributable to a combination of decreased emissions and lifetimes. Relative contributions from sea salt (SS) and dust (DU) have shifted from being approximately equal in AP1 to SS contributing about 2/3 of the natural AOD in AP3. This shift is linked with a decrease in DU mass burden, a lower DU MEC, and a slight decrease in DU lifetime, suggesting coarser DU particle sizes in AP3 compared to AP1. Relative to observations, the AP3 ensemble median and most of the participating models underestimate all aerosol optical properties investigated, that is, total AOD as well as fine and coarse AOD (AODf, AODc), Ångström exponent (AE), dry surface scattering (SCdry), and absorption (ACdry) coefficients. Compared to AERONET, the models underestimate total AOD by ca. 21 % ± 20 % (as inferred from the ensemble median and interquartile range). Against satellite data, the ensemble AOD biases range from -37 % (MODIS-Terra) to -16 % (MERGED-FMI, a multi-satellite AOD product), which we explain by differences between individual satellites and AERONET measurements themselves. Correlation coefficients (R) between model and observation AOD records are generally high (R>0.75), suggesting that the models are capable of capturing spatio-temporal variations in AOD. We find a much larger underestimate in coarse AODc (∼ -45 % ± 25 %) than in fine AODf (∼ -15 % ± 25 %) with slightly increased inter-model spread compared to total AOD. These results indicate problems in the modelling of DU and SS. The AODc bias is likely due to missing DU over continental land masses (particularly over the United States, SE Asia, and S. America), while marine AERONET sites and the AATSR SU satellite data suggest more moderate oceanic biases in AODc. Column AEs are underestimated by about 10 % ± 16 %. For situations in which measurements show AE > 2, models underestimate AERONET AE by ca. 35 %. In contrast, all models (but one) exhibit large overestimates in AE when coarse aerosol dominates (bias ca. +140 % if observed AE < 0.5). Simulated AE does not span the observed AE variability. These results indicate that models overestimate particle size (or underestimate the fine-mode fraction) for fine-dominated aerosol and underestimate size (or overestimate the fine-mode fraction) for coarse-dominated aerosol. This must have implications for lifetime, water uptake, scattering enhancement, and the aerosol radiative effect, which we can not quantify at this moment. Comparison against Global Atmosphere Watch (GAW) in situ data results in mean bias and inter-model variations of -35 % ± 25 % and -20 % ± 18 % for SCdry and ACdry, respectively. The larger underestimate of SCdry than ACdry suggests the models will simulate an aerosol single scattering albedo that is too low. The larger underestimate of SCdry than ambient air AOD is consistent with recent findings that models overestimate scattering enhancement due to hygroscopic growth. The broadly consistent negative bias in AOD and surface scattering suggests an underestimate of aerosol radiative effects in current global aerosol models. Considerable inter-model diversity in the simulated optical properties is often found in regions that are, unfortunately, not or only sparsely covered by ground-based observations. This includes, for instance, the Sahara, Amazonia, central Australia, and the South Pacific. This highlights the need for a better site coverage in the observations, which would enable us to better assess the models, but also the performance of satellite products in these regions. Using fine-mode AOD as a proxy for present-day aerosol forcing estimates, our results suggest that models underestimate aerosol forcing by ca. -15 %, however, with a considerably large interquartile range, suggesting a spread between -35 % and +10 %.

    DOI: 10.5194/acp-21-87-2021

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  16. Resolving aerosol mixing state increases accuracy of black carbon respiratory deposition estimates 査読有り 国際誌

    Ching Joseph, Kajino Mizuo, Matsui Hitoshi

    ONE EARTH   3 巻 ( 6 ) 頁: 763 - 776   2020年12月

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    担当区分:最終著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:One Earth  

    Black carbon (BC) particles, also known as soot, deteriorate air quality and threaten public health. BC is emitted from the incomplete combustion of fossil fuel, which is a major energy source in the world today. Therefore, evaluating the impact of BC on global public health is vital, especially in the context of growing global population and energy demand. Since the atmospheric lifetime and deposition efficiency of BC after inhalation are governed by the size and chemical composition, realistic representation of those properties in models is required for such evaluation, yet is currently lacking. Here, we show that a simple but commonly found representation of size and chemical composition of BC particles in global models results in globally prevalent underestimation of the respiratory deposited BC mass concentration. The results emphasize that realistic representation of BC particles is indispensable to the evaluation and hence the mitigation of BC impacts on global public health. Black carbon (BC) particles deteriorate air quality and threaten public health. BC is emitted from the incomplete combustions of fossil fuels. Our world relies heavily on fossil fuels for energy and has rising population and energy demand, therefore, it is imperative to evaluate the impact of BC on global public health. Here, we show that a common and simple representation of BC particles in global climate models causes globally prevalent underestimation of respiratory deposited BC mass concentration. Also, the uncertainty of the sizes of BC particles at emission is shown to modulate the underestimation. The results highlight the need of a more realistic representation of BC, which is currently lacking, in order to better assess the public health impact. Multidisciplinary studies involving atmospheric science, epidemiology, and toxicology can establish a scientific foundation for BC mitigation policy, which benefits the sustainable development of an increasingly urban world. Black carbon (BC) particles are emitted from the incomplete combustions of fossil fuels and deteriorate air quality and threaten public health. Evaluating the impact of BC on global public health is challenging and requires realistic aerosol representation in models, which is currently lacking. We find that simple aerosol representations in global climate models lead to globally prevalent underestimation of respiratory deposited mass concentration of BC. Besides, the uncertainties in BC emission size distributions modulate the magnitude of the underestimation.

    DOI: 10.1016/j.oneear.2020.11.004

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  17. Seasonal Trends of Atmospheric Ice Nucleating Particles Over Tokyo 査読有り 国際誌

    Tobo Yutaka, Uetake Jun, Matsui Hitoshi, Moteki Nobuhiro, Uji Yasushi, Iwamoto Yoko, Miura Kazuhiko, Misumi Ryohei

    JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   125 巻 ( 23 )   2020年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Geophysical Research: Atmospheres  

    Ice nucleating particles (INPs) originating from Asia are expected to have large impacts on aerosol-cloud-precipitation interactions on local, regional, and global scales. However, their seasonal variability is poorly understood. Here, we present a year-round record of atmospheric INPs measured on Tokyo Skytree, which is the world's tallest broadcasting tower located in the Tokyo Metropolitan area. The INP number concentrations showed relatively small variations in the temperature regime below −20°C, whereas the values were episodically enhanced by long-range transported Asian dusts. On the other hand, the INP spectra in the temperature regime warmer than −20°C exhibited measurable seasonal variations. Notably, the INP number concentrations in the temperature regime between −15°C and −10°C tended to indicate higher values in warm/wet seasons and lower values in cold/dry seasons. Our results suggest that Asian dust events and seasonal variations in certain particles of biological origin linked to local/regional meteorology might influence the seasonal trends of the INP spectra over the Tokyo Metropolitan area.

    DOI: 10.1029/2020JD033658

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  18. Black Carbon Absorption Efficiency Under Preindustrial and Present-Day Conditions Simulated by a Size- and Mixing-State-Resolved Global Aerosol Model 査読有り 国際誌

    Matsui Hitoshi

    JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   125 巻 ( 18 )   2020年9月

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    担当区分:筆頭著者, 最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Geophysical Research: Atmospheres  

    The positive radiative forcing of black carbon (BC) aerosol depends not only on the spatial and temporal distribution of BC but also its absorption efficiency. The mass absorption cross section (MAC) of BC is enhanced by atmospheric aging processes that increase particle size and non-BC coating amounts (mixing state) of BC-containing particles. However, the representation of MAC (or absorption enhancement) in current global aerosol models has a large uncertainty. This study used a global aerosol model that resolves particle size and mixing state to show that the MAC of anthropogenic BC has increased by 50% from preindustrial to present-day conditions (from 5.6 to 8.6 m2 g−1) because faster present-day aging processes increase the fraction of thickly coated BC particles, which have high absorption efficiency. This effect is apparent only when the model considers BC mixing state with sufficient resolution. The impact of this MAC enhancement on BC direct radiative forcing is estimated to be 0.051–0.086 W m−2 globally (22–37% of anthropogenic BC direct radiative forcing, 0.23 W m−2) and exceeds 0.5 W m−2 near-source regions in East Asia. Sensitivity simulations show that BC direct radiative forcing and MAC are highly sensitive to non-BC emissions, secondary aerosol formation, and aerosol size distribution and mixing state in emissions. We must therefore improve our understanding of these factors by further observations and reduce their discrepancies between models to achieve better estimates of BC absorption efficiency and radiative forcing.

    DOI: 10.1029/2019JD032316

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  19. Recent (1980 to 2015) Trends and Variability in Daily-to-Interannual Soluble Iron Deposition from Dust, Fire, and Anthropogenic Sources 査読有り 国際共著 国際誌

    Hamilton Douglas S., Scanza Rachel A., Rathod Sagar D., Bond Tami C., Kok Jasper F., Li Longlei, Matsui Hitoshi, Mahowald Natalie M.

    GEOPHYSICAL RESEARCH LETTERS   47 巻 ( 17 )   2020年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Geophysical Research Letters  

    The iron cycle is a key component of the Earth system. Yet how variable the atmospheric flux of soluble (bioaccessible) iron into oceans is, and how this variability is modulated by human activity and a changing climate, is not well known. For the first time, we characterize Satellite Era (1980 to 2015) daily-to-interannual modeled soluble iron emission and deposition variability from both pyrogenic (fires and anthropogenic combustion) and dust sources. Statistically significant emission trends exist: dust iron decreases, fire iron slightly increases, and anthropogenic iron increases. A strong temporal variability in deposition to ocean basins is found, and, for most regions, dust iron dominates the absolute deposition magnitude, fire iron is an important contributor to temporal variability, and anthropogenic iron imposes a significant increasing trend. Quantifying soluble iron daily-to-interannual deposition variability from all major iron sources, not only dust, will advance quantification of changes in marine biogeochemistry in response to the continuing human perturbation to the Earth System.

    DOI: 10.1029/2020GL089688

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  20. A global model-measurement evaluation of particle light scattering coefficients at elevated relative humidity 査読有り 国際共著 国際誌

    Burgos Maria A., Andrews Elisabeth, Titos Gloria, Benedetti Angela, Bian Huisheng, Buchard Virginie, Curci Gabriele, Kipling Zak, Kirkevag Alf, Kokkola Harri, Laakso Anton, Letertre-Danczak Julie, Lund Marianne T., Matsui Hitoshi, Myhre Gunnar, Randles Cynthia, Schulz Michael, van Noije Twan, Zhang Kai, Alados-Arboledas Lucas, Baltensperger Urs, Jefferson Anne, Sherman James, Sun Junying, Weingartner Ernest, Zieger Paul

    ATMOSPHERIC CHEMISTRY AND PHYSICS   20 巻 ( 17 ) 頁: 10231 - 10258   2020年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Atmospheric Chemistry and Physics  

    The uptake of water by atmospheric aerosols has a pronounced effect on particle light scattering properties, which in turn are strongly dependent on the ambient relative humidity (RH). Earth system models need to account for the aerosol water uptake and its influence on light scattering in order to properly capture the overall radiative effects of aerosols. Here we present a comprehensive model measurement evaluation of the particle light scattering enhancement factor f (RH), defined as the particle light scattering coefficient at elevated RH (here set to 85 %) divided by its dry value. The comparison uses simulations from 10 Earth system models and a global dataset of surface-based in situ measurements. In general, we find a large diversity in the magnitude of predicted f (RH) amongst the different models, which can not be explained by the site types. Based on our evaluation of sea salt scattering enhancement and simulated organic mass fraction, there is a strong indication that differences in the model parameterizations of hygroscopicity and model chemistry are driving at least some of the observed diversity in simulated f (RH). Additionally, a key point is that defining dry conditions is difficult from an observational point of view and, depending on the aerosol, may influence the measured f (RH). The definition of dry also impacts our model evaluation, because several models exhibit significant water uptake between RH D0% and 40 %. The multisite average ratio between model outputs and measurements is 1.64 when RHD0% is assumed as the model dry RH and 1.16 when RHD40% is the model dry RH value. The overestimation by the models is believed to originate from the hygroscopicity parameterizations at the lower RH range which may not implement all phenomena taking place (i.e., not fully dried particles and hysteresis effects). This will be particularly relevant when a location is dominated by a deliquescent aerosol such as sea salt. Our results emphasize the need to consider the measurement conditions in such comparisons and recognize that measurements referred to as dry may not be dry in model terms. Recommendations for future model measurement evaluation and model improvements are provided.

    DOI: 10.5194/acp-20-10231-2020

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  21. High Sensitivity of Arctic Black Carbon Radiative Effects to Subgrid Vertical Velocity in Aerosol Activation 査読有り 国際誌

    Matsui Hitoshi, Moteki Nobuhiro

    GEOPHYSICAL RESEARCH LETTERS   47 巻 ( 16 )   2020年8月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Geophysical Research Letters  

    The representation of aerosol activation into cloud droplets in climate models is important for accurate understanding of aerosol radiative impacts on the Arctic climate, but it remains highly uncertain. Here we show that the uncertainty range of subgrid vertical velocity (SVV) and maximum supersaturation (SSmax) in aerosol activation produces fourfold to fivefold differences in the direct radiative effect of black carbon (BC) in the Arctic (0.091–0.40 W m−2) because SVV and SSmax determine the activated fraction and wet removal efficiency of aerosols. Aerosols are particularly sensitive to SVV in remote regions but not near their sources because many aerosols near sources are not yet influenced by wet removal processes. Our results demonstrate that SVV treatment is a major source of uncertainty in Arctic aerosol simulations and may be key for reducing the large discrepancies among global models in estimates of BC and its radiative effects in the Arctic.

    DOI: 10.1029/2020GL088978

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  22. Seasonal Variation of Wet Deposition of Black Carbon in Arctic Alaska 査読有り 国際共著 国際誌

    Mori T., Kondo Y., Ohata S., Zhao Y., Sinha P. R., Oshima N., Matsui H., Moteki N., Koike M.

    JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   125 巻 ( 16 )   2020年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Geophysical Research: Atmospheres  

    Black carbon (BC) aerosol deposited in and onto Arctic snow increases the snow's absorption of sunlight and accelerates snowmelt. Wet removal of BC from the atmosphere plays a key role in determining its abundance in the Arctic atmosphere and in Arctic snow. However, this process is poorly understood, mainly due to the scarcity of relevant measurements. To study wet deposition of BC, we made measurements of mass concentration of BC in snow and rain (CMBC) and of BC in air (MBC) with high accuracy (16% and 10%, respectively) at the Barrow Atmospheric Baseline Observatory, Alaska, from July 2013 to August 2017 and analyzed them along with routinely measured meteorological parameters from Barrow. Monthly mean MBC near the surface and CMBC were poorly correlated from midwinter to early spring, when CMBC was close to the annual median while MBC was at its annual peak. Seasonal variations in the altitude distribution of MBC may lead to these differences in seasonal variation of MBC near the surface and CMBC. About 50% of the annual wet deposition of BC occurred in the 3 months of summer, associated with high values of total precipitation and BC originating from biomass burning. Size distributions of BC in snow and rain were stable throughout the year, suggesting that the size distribution of BC in the lower troposphere was similarly stable. Calculations by two global models reproduced the observed seasonal variations of CMBC and showed that BC from biomass burning dominated CMBC in summer.

    DOI: 10.1029/2019JD032240

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  23. Abundances and Microphysical Properties of Light-Absorbing Iron Oxide and Black Carbon Aerosols Over East Asia and the Arctic 査読有り 国際誌

    Yoshida Atsushi, Moteki Nobuhiro, Ohata Sho, Mori Tatsuhiro, Koike Makoto, Kondo Yutaka, Matsui Hitoshi, Oshima Naga, Takami Akinori, Kita Kazuyuki

    JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   125 巻 ( 15 )   2020年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Journal of Geophysical Research: Atmospheres  

    Black carbon (BC), brown carbon, and light-absorbing iron oxides (FeOx) aerosols affect Earth's energy budget through their strong absorption of solar radiation. FeOx aerosols can also affect global biogeochemical cycles through their role as a nutrient for oceanic phytoplankton. However, observational data for these aerosols required for evaluating their effects using global models are scarce, especially for FeOx. Here, we summarize and compare the data sets of BC and FeOx from five ground-based and three aircraft observation campaigns conducted in the East Asian and Arctic regions during the 2009–2018 period acquired using a modified single-particle soot photometer. In these campaigns, >80% of FeOx-containing aerosols in the 170–270 nm FeOx core size range had microphysical features indicating an anthropogenic origin. The particle size distribution for each of the BC and FeOx was similar in all of the data sets except for those dominated by fresh urban pollution or pristine Arctic air. The campaign-averaged mass concentrations of FeOx and BC were ~60–360 ng/m3 and ~240–1,300 ng/m3, respectively, in East Asia, and ~6 ng/m3 and ~20–30 ng/m3, respectively, in the Arctic. The campaign-averaged FeOx/BC mass concentration ratio varied within a narrow range of 0.2–0.6 in both East Asian and Arctic regions. In every campaign, FeOx, BC, and carbon monoxide were tightly correlated with each other with similar slope to the urban campaigns (around Tokyo), implying the spatiotemporal variation of anthropogenic FeOx emission around northern middle-to-high latitudes is similar to those of anthropogenic BC and CO emissions.

    DOI: 10.1029/2019JD032301

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  24. 降水雲の過飽和度を観測から制約する:エアロゾル空間分布の予測のために 査読有り

    茂木信宏、森樹大、松井仁志、大畑祥

    大気化学研究   41 巻   頁: 041A03   2019年7月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

  25. Evaluation of global simulations of aerosol particle and cloud condensation nuclei number, with implications for cloud droplet formation 査読有り 国際共著 国際誌

    Fanourgakis George S., Kanakidou Maria, Nenes Athanasios, Bauer Susanne E., Bergman Tommi, Carslaw Ken S., Grini Alf, Hamilton Douglas S., Johnson Jill S., Karydis Vlassis A., Kirkevag Alf, Kodros John K., Lohmann Ulrike, Luo Gan, Makkonen Risto, Matsui Hitoshi, Neubauer David, Pierce Jeffrey R., Schmale Julia, Stier Philip, Tsigaridis Kostas, van Noije Twan, Wang Hailong, Watson-Parris Duncan, Westervelt Daniel M., Yang Yang, Yoshioka Masaru, Daskalakis Nikos, Decesari Stefano, Gysel-Beer Martin, Kalivitis Nikos, Liu Xiaohong, Mahowald Natalie M., Myriokefalitakis Stelios, Schrodner Roland, Sfakianaki Maria, Tsimpidi Alexandra P., Wu Mingxuan, Yu Fangqun

    ATMOSPHERIC CHEMISTRY AND PHYSICS   19 巻 ( 13 ) 頁: 8591 - 8617   2019年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Atmospheric Chemistry and Physics  

    A total of 16 global chemistry transport models and general circulation models have participated in this study; 14 models have been evaluated with regard to their ability to reproduce the near-surface observed number concentration of aerosol particles and cloud condensation nuclei (CCN), as well as derived cloud droplet number concentration (CDNC). Model results for the period 2011-2015 are compared with aerosol measurements (aerosol particle number, CCN and aerosol particle composition in the submicron fraction) from nine surface stations located in Europe and Japan. The evaluation focuses on the ability of models to simulate the average across time state in diverse environments and on the seasonal and short-term variability in the aerosol properties. There is no single model that systematically performs best across all environments represented by the observations. Models tend to underestimate the observed aerosol particle and CCN number concentrations, with average normalized mean bias (NMB) of all models and for all stations, where data are available, of -24% and -35% for particles with dry diameters >50 and >120nm, as well as -36% and -34% for CCN at supersaturations of 0.2% and 1.0%, respectively. However, they seem to behave differently for particles activating at very low supersaturations (<0.1%) than at higher ones. A total of 15 models have been used to produce ensemble annual median distributions of relevant parameters. The model diversity (defined as the ratio of standard deviation to mean) is up to about 3 for simulated N3 (number concentration of particles with dry diameters larger than 3nm) and up to about 1 for simulated CCN in the extra-polar regions. A global mean reduction of a factor of about 2 is found in the model diversity for CCN at a supersaturation of 0.2% (CCN0.2) compared to that for N3, maximizing over regions where new particle formation is important. An additional model has been used to investigate potential causes of model diversity in CCN and bias compared to the observations by performing a perturbed parameter ensemble (PPE) accounting for uncertainties in 26 aerosol-related model input parameters. This PPE suggests that biogenic secondary organic aerosol formation and the hygroscopic properties of the organic material are likely to be the major sources of CCN uncertainty in summer, with dry deposition and cloud processing being dominant in winter. Models capture the relative amplitude of the seasonal variability of the aerosol particle number concentration for all studied particle sizes with available observations (dry diameters larger than 50, 80 and 120nm). The short-term persistence time (on the order of a few days) of CCN concentrations, which is a measure of aerosol dynamic behavior in the models, is underestimated on average by the models by 40% during winter and 20% in summer. In contrast to the large spread in simulated aerosol particle and CCN number concentrations, the CDNC derived from simulated CCN spectra is less diverse and in better agreement with CDNC estimates consistently derived from the observations (average NMB -13% and -22% for updraft velocities 0.3 and 0.6ms-1, respectively). In addition, simulated CDNC is in slightly better agreement with observationally derived values at lower than at higher updraft velocities (index of agreement 0.64 vs. 0.65). The reduced spread of CDNC compared to that of CCN is attributed to the sublinear response of CDNC to aerosol particle number variations and the negative correlation between the sensitivities of CDNC to aerosol particle number concentration (Nd=Na) and to updraft velocity (Nd=w). Overall, we find that while CCN is controlled by both aerosol particle number and composition, CDNC is sensitive to CCN at low and moderate CCN concentrations and to the updraft velocity when CCN levels are high. Discrepancies are found in sensitivities Nd=Na and Nd=w; models may be predisposed to be too "aerosol sensitive" or "aerosol insensitive" in aerosol-cloud-climate interaction studies, even if they may capture average droplet numbers well. This is a subtle but profound finding that only the sensitivities can clearly reveal and may explain intermodel biases on the aerosol indirect effect.

    DOI: 10.5194/acp-19-8591-2019

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  26. Observational constraint of in-cloud supersaturation for simulations of aerosol rainout in atmospheric models 査読有り 国際誌

    Moteki Nobuhiro, Mori Tatsuhiro, Matsui Hitoshi, Ohata Sho

    NPJ CLIMATE AND ATMOSPHERIC SCIENCE   2 巻 ( 1 )   2019年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:npj Climate and Atmospheric Science  

    Quantitative simulation of an aerosol’s lifecycle by regional-scale and global-scale atmospheric models is mandatory for unbiased analysis and prediction of aerosol radiative forcing and climate change. Globally, aerosol deposition is dominated by the rainout process, which is mostly triggered by activation of aerosols to liquid droplets in supersaturated domains of precipitating clouds. However, the actual environmental supersaturation value that aerosols experience in precipitating clouds is difficult for models to predict, and it has never been constrained by observations; as a result, there is large uncertainty in atmospheric aerosol simulations. Here, by a particle-tracer analysis of 37 rainfall events in East Asia, near the largest source region of anthropogenic aerosols in the northern hemisphere, we observed that the environmental supersaturation actually experienced by the removed aerosols in precipitating clouds averaged 0.08 ± 0.03% and ranged from 0.03 to 0.2%. Simulations by a mixing-state-resolved global aerosol model showed that the simulated long-range transport efficiency and global atmospheric burden of black carbon aerosols can be changed by a factor of two or three as a result of a change in the environmental supersaturation in precipitating clouds within just 0.08 ± 0.03%. This result is attributable to the fact that the sensitivity of an aerosol’s rainout efficiency to environmental supersaturation is higher for the less-aged black carbon concentrated near source regions. Our results suggest that observational constraints of environmental supersaturation in precipitating clouds, particularly near source regions, are of fundamental importance for accurate simulation of the atmospheric burden of black carbon and other aerosols.

    DOI: 10.1038/s41612-019-0063-y

    Web of Science

    Scopus

  27. Impacts of New Particle Formation on Short-term Meteorology and Air Quality as Determined by the NPF-explicit WRF-Chem in the Midwestern United States 査読有り 国際共著 国際誌

    Dong Can, Matsui Hitoshi, Spak Scott, Kalafut-Pettibone Alicia, Stanier Charles

    AEROSOL AND AIR QUALITY RESEARCH   19 巻 ( 2 ) 頁: 204 - 220   2019年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Aerosol and Air Quality Research  

    New particle formation (NPF) from nucleation and subsequent nuclei growth, which is frequently observed in the troposphere, is critical to aerosol-cloud interactions yet difficult to simulate. In this work, regional simulations with the fully coupled NPF-explicit WRF-Chem model link NPF to cloud properties and to changes in both meteorology and air quality in the U.S. Midwest during summer 2008. Simulations that include NPF have higher concentrations of condensation nuclei, as anticipated from the particle production associated with nucleation, leading to enhanced concentrations of cloud condensation nuclei (CCN) at high supersaturations. However, the online-coupled model develops a number of unexpected features that can be traced to a feedback loop involving aqueous (in-cloud) oxidation of sulfur combined with boundary layer NPF. Simulations with NPF (relative to simulations without) exhibit reduced PM2.5 sulfate mass, cloud dimming (reductions in the cloud frequency, CCN concentration at a low supersaturation, cloud optical depth, and cloud droplet number concentration), and enhanced surface-reaching shortwave radiation. This effect of NPF on the PM2.5 mass is mostly absent for other constituents of PM2.5. The implications of this feedback loop, which is not considered in most climate and air quality modeling, are discussed.

    DOI: 10.4209/aaqr.2018.05.0163

    Web of Science

    Scopus

  28. Black carbon radiative effects highly sensitive to emitted particle size when resolving mixing-state diversity 査読有り 国際共著 国際誌

    Matsui Hitoshi, Hamilton Douglas S., Mahowald Natalie M.

    NATURE COMMUNICATIONS   9 巻 ( 1 ) 頁: 3446   2018年8月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1038/s41467-018-05635-1

    Web of Science

    PubMed

  29. New particle formation leads to cloud dimming 査読有り 国際共著 国際誌

    Ryan C. Sullivan, Paola Crippa, Hitoshi Matsui, L. Ruby Leung, Chun Zhao, Abhinav Thota and Sara C. Pryor

    NPJ CLIMATE AND ATMOSPHERIC SCIENCE   1 巻   頁: 9   2018年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: doi:10.1038/s41612-018-0019-7

  30. Impacts of Aerosol Dry Deposition on Black Carbon Spatial Distributions and Radiative Effects in the Community Atmosphere Model CAM5 査読有り 国際共著 国際誌

    Wu Mingxuan, Liu Xiaohong, Zhang Leiming, Wu Chenglai, Lu Zheng, Ma Po-Lun, Wang Hailong, Tilmes Simone, Mahowald Natalie, Matsui Hitoshi, Easter Richard C.

    JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS   10 巻 ( 5 ) 頁: 1150 - 1171   2018年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1029/2017MS001219

    Web of Science

    Scopus

  31. Anthropogenic combustion iron as a complex climate forcer 査読有り 国際共著 国際誌

    Matsui, H., N. M. Mahowald, N. Moteki, D. S. Hamilton, S. Ohata, A. Yoshida, M. Koike, R. A. Scanza, and M. G. Flanner

    NATURE COMMUNICATIONS   9 巻   頁: 1593   2018年4月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1038/s41467-018-03997-0

  32. New particle formation leads to cloud dimming 査読有り 国際共著 国際誌

    Sullivan Ryan C., Crippa Paola, Matsui Hitoshi, Leung L. Ruby, Zhao Chun, Thota Abhinav, Pryor Sara C.

    NPJ CLIMATE AND ATMOSPHERIC SCIENCE   1 巻 ( 1 ) 頁: 9   2018年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Springer Nature  

    New particle formation (NPF), nucleation of condensable vapors to the solid or liquid phase, contributes significantly to atmospheric aerosol particle number concentrations. With sufficient growth, these nucleated particles may be a significant source of cloud condensation nuclei (CCN), thus altering cloud albedo, structure, and lifetimes, and insolation reaching the Earth’s surface. Herein we present one of the first numerical experiments conducted at sufficiently high resolution and fidelity to quantify the impact of NPF on cloud radiative properties. Consistent with observations in spring over the Midwestern USA, NPF occurs frequently and on regional scales. However, NPF is not associated with enhancement of regional cloud albedo. These simulations indicate that NPF reduces ambient sulfuric acid concentrations sufficiently to inhibit growth of preexisting particles to CCN sizes, reduces CCN-sized particle concentrations, and reduces cloud albedo. The reduction in cloud albedo on NPF days results in a domain average positive top of atmosphere cloud radiative forcing, and thus warming, of 10 W m−2 and up to ~50 W m−2 in individual grid cells relative to a simulation in which NPF is excluded.

    DOI: 10.1038/s41612-018-0019-7

    Web of Science

    Scopus

  33. Observed and modeled mass concentrations of organic aerosols and PM2.5 at three remote sites around the East China Sea: Roles of chemical aging 査読有り

    Kanaya, Y., H. Matsui, F. Taketani, X. Pan, Y. Komazaki, Z. Wang, L. Chang, D. Kang, M. Choi, S.-Y. Kim, C.-H. Kang, A. Takami, H. Tanimoto, K. Ikeda, and K. Yamaji

    AEROSOL AND AIR QUALITY RESEARCH   17 巻 ( 12 ) 頁: 3091-3105   2017年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.4209/aaqr.2016.12.0573

    Web of Science

  34. Development of a global aerosol model using a two-dimensional sectional method: 1. Model design 査読有り 国際誌

    Matsui H.

    JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS   9 巻 ( 4 ) 頁: 1921 - 1947   2017年8月

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    担当区分:筆頭著者, 最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/2017MS000936

    Web of Science

    Scopus

  35. Development of a global aerosol model using a two-dimensional sectional method: 2. Evaluation and sensitivity simulations 査読有り 国際共著 国際誌

    Matsui H., Mahowald N.

    JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS   9 巻 ( 4 ) 頁: 1887 - 1920   2017年8月

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    担当区分:筆頭著者, 責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/2017MS000937

    Web of Science

  36. Enhancement of aerosol responses to changes in emissions over East Asia by gas-oxidant-aerosol coupling and detailed aerosol processes 査読有り

    Matsui, H. and M. Koike

    JOURNAL OF GEOPHYSICAL RESEARCH ATMOSPHERES   121 巻   頁: 7161-7171   2016年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/2015JD024671

  37. Black carbon simulations using a size- and mixing-state-resolved three-dimensional model: 1. Radiative effects and their uncertainties 査読有り

    Matsui, H.

    JOURNAL OF GEOPHYSICAL RESEARCH ATMOSPHERES   121 巻   頁: 1793-1807   2016年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/2015JD023998

  38. Black carbon simulations using a size- and mixing-state-resolved three-dimensional model: 2. Aging timescale and its impact over East Asia 査読有り

    Matsui, H.

    JOURNAL OF GEOPHYSICAL RESEARCH ATMOSPHERES   121 巻   頁: 1808-1821   2016年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/2015JD023999

  39. Modeling particle nucleation and growth over northern California during the 2010 CARES campaign 査読有り

    Lupascu, A., R. Easter, R. Zaveri, M. Shrivastava, M. Pekour, J. Tomlinson, Q. Yang, H. Matsui, A. Hodzic, Q. Zhang, and J. D. Fast

    ATMOSPHERIC CHEMISTRY AND PHYSICS   15 巻   頁: 12283-12313   2015年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.5194/acp-15-12283-2015

  40. エアロゾルの数・粒径・混合状態を予測する新世代モデルの開発と検証 査読有り

    松井 仁志

    天気   62 巻 ( 7 ) 頁: 569-580   2015年7月

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    記述言語:日本語  

  41. An evaluation of simulated particulate sulfate over East Asia through global model intercomparison 査読有り

    Goto, D., T. Nakajima, T. Dai, T. Takemura, M. Kajino, H. Matsui, A. Takami, S. Hatakeyama, N. Sugimoto, A. Shimizu, and T. Ohara

    JOURNAL OF GEOPHYSICAL RESEARCH ATMOSPHERES   120 巻 ( 12 ) 頁: 6247-6270   2015年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/2014JD021693

    Web of Science

  42. Modeling ultrafine particle growth at a pine forest site influenced by anthropogenic pollution during BEACHON-RoMBAS 2011 査読有り

    Cui, Y. Y., A. Hodzic, J. N. Smith, J. Ortega, J. Brioude, H. Matsui, E. J. T. Levin, A. Turnipseed, P. Winkler, and B. de Foy

    ATMOSPHERIC CHEMISTRY AND PHYSICS   14 巻   頁: 11011-11029   2014年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.5194/acp-14-11011-2014

  43. Development of an aerosol microphysical module: Aerosol Two-dimensional bin module for foRmation and Aging Simulation (ATRAS) 査読有り

    Matsui, H., M. Koike, Y. Kondo, J. D. Fast, and M. Takigawa

    ATMOSPHERIC CHEMISTRY AND PHYSICS   14 巻   頁: 10315-10331   2014年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.5194/acp-14-10315-2014

  44. Volatility basis-set approach simulation of organic aerosol formation in East Asia: implications for anthropogenic-biogenic interaction and controllable amounts 査読有り

    Matsui, H., M. Koike, Y. Kondo, A. Takami, J. D. Fast, Y. Kanaya, and M. Takigawa

    ATMOSPHERIC CHEMISTRY AND PHYSICS   14 巻   頁: 9513-9535   2014年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.5194/acp-14-9513-2014

  45. Wet deposition of black carbon at a remote site in the East China Sea 査読有り

    Mori, T., Y. Kondo, S. Ohata, N. Moteki, H. Matsui, N. Oshima, and A. Iwasaki

    JOURNAL OF GEOPHYSICAL RESEARCH ATMOSPHERES   119 巻   頁: 10485-10498   2014年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/2014JD022103

  46. 次世代エアロゾルモデルの開発と検証:「数・粒径・混合状態」の予測への挑戦 査読有り

    松井 仁志

    低温科学   72 巻   頁: 49-64   2014年4月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)  

  47. Case study of absorption aerosol optical depth closure of black carbon over the East China Sea 査読有り

    Koike, M., N. Moteki, P. Khatri, T. Takamura, N. Takegawa, Y. Kondo, H. Hashioka, H. Matsui, A. Shimizu, and N. Sugimoto

    JOURNAL OF GEOPHYSICAL RESEARCH ATMOSPHERES   119 巻   頁: 122-136   2014年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/2013JD020163

  48. Vertical transport mechanisms of black carbon over East Asia in spring during the A-FORCE campaign 査読有り

    Oshima, N., M. Koike, Y. Kondo, H. Nakamura, N. Moteki, H. Matsui, N. Takegawa, and K. Kita

    JOURNAL OF GEOPHYSICAL RESEARCH ATMOSPHERES   118 巻   頁: 13175-13198   2013年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/2013JD020262

  49. Spatial and temporal variations of new particle formation in East Asia using an NPF-explicit WRF-chem model: North-south contrast in new particle formation frequency 査読有り

    Matsui, H., M. Koike, N. Takegawa, Y. Kondo, A. Takami, T. Takamura, S. Yoon, S.-W. Kim, H.-C. Lim, and J. D. Fast

    JOURNAL OF GEOPHYSICAL RESEARCH ATMOSPHERES   118 巻   頁: 11647-11663   2013年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/jgrd.50821

  50. Seasonal variations of Asian black carbon outflow to the Pacific: Contribution from anthropogenic sources in China and biomass burning sources in Siberia and Southeast Asia 査読有り

    Matsui, H., M. Koike, Y. Kondo, N. Oshima, N. Moteki, Y. Kanaya, A. Takami, and M. Irwin

    JOURNAL OF GEOPHYSICAL RESEARCH ATMOSPHERES   118 巻   頁: 9948-9967   2013年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/jgrd.50702

  51. Seasonal variations of black carbon observed at the remotemountain site Happo in Japan 査読有り

    Liu, X., Y. Kondo, K. Ram, H. Matsui, K. Nakagomi, T. Ikeda, N. Oshima, R. L. Verma, N. Takegawa, M. Koike, and M. Kajino

    JOURNAL OF GEOPHYSICAL RESEARCH ATMOSPHERES   118 巻   頁: 3709-3722   2013年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/jgrd.50317

  52. Development and validation of a black carbon mixing state resolved three-dimensional model: Aging processes and radiative impact 査読有り

    Matsui, H., M. Koike, Y. Kondo, N. Moteki, J. D. Fast, and R. A. Zaveri

    JOURNAL OF GEOPHYSICAL RESEARCH ATMOSPHERES   118 巻   頁: 2304-2326   2013年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1029/2012JD018446

  53. Measurements of regional-scale aerosol impacts on cloud microphysics over the East China Sea: Possible influences of warm sea surface temperature over the Kuroshio ocean current 査読有り

    Koike, M., N. Takegawa, N. Moteki, Y. Kondo, H. Nakamura, K. Kita, H. Matsui, N. Oshima, M. Kajino, and T. Y. Nakajima

    JOURNAL OF GEOPHYSICAL RESEARCH   117 巻   頁: D17205   2012年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1029/2011JD017324

  54. Size dependence of wet removal of black carbon aerosols during transport from the boundary layer to the free troposphere 査読有り

    Moteki, N., Y. Kondo, N. Oshima, N. Takegawa, M. Koike, K. Kita, H. Matsui, and M. Kajino

    GEOPHYSICAL RESEARCH LETTERS   39 巻   頁: L13802   2012年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1029/2012GL052034

  55. New source and process apportionment method using a three-dimensional chemical transport model: Process, age, and source region chasing algorithm (PASCAL) 査読有り

    Matsui, H. and M. Koike

    ATMOSPHERIC ENVIRONMENT   55 巻   頁: 399-409   2012年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.atmosenv.2012.02.080

  56. Wet removal of black carbon in Asian outflow: Aerosol Radiative Forcing in East Asia (A-FORCE) aircraft campaign 査読有り

    Oshima, N., Y. Kondo, N. Moteki, N. Takegawa, M. Koike, K. Kita, H. Matsui, M. Kajino, H. Nakamura, J. S. Jung, and Y. J. Kim

    JOURNAL OF GEOPHYSICAL RESEARCH   117 巻   頁: D03204   2012年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1029/2011JD016552

  57. Seasonal variations of the transport of black carbon and carbon monoxide from the Asian continent to the western Pacific in the boundary layer 査読有り

    Verma, R. L., Y. Kondo, N. Oshima, H. Matsui, K. Kita, L. K. Sahu, S. Kato, Y. Kajii, A. Takami, and T. Miyakawa

    JOURNAL OF GEOPHYSICAL RESEARCH   116 巻   頁: D21307   2011年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1029/2011JD015830

  58. Accumulation-mode aerosol number concentrations in the Arctic during the ARCTAS aircraft campaign: Long-range transport of polluted and clean air from the Asian continent 査読有り

    Matsui, H., Y. Kondo, N. Moteki, N. Takegawa, L. K. Sahu, M. Koike, Y. Zhao, H. E. Fuelberg, W. R. Sessions, G. Diskin, B. E. Anderson, D. R. Blake, A. Wisthaler, M. J. Cubison, and J. L. Jimenez

    JOURNAL OF GEOPHYSICAL RESEARCH   116 巻   頁: D20217   2011年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1029/2011JD016189

  59. Impact of new particle formation on the concentrations of aerosols and cloud condensation nuclei around Beijing 査読有り

    Matsui, H., M. Koike, Y. Kondo, N. Takegawa, A. Wiedensohler, J. D. Fast, and R. A. Zaveri

    JOURNAL OF GEOPHYSICAL RESEARCH   116 巻   頁: D19208   2011年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1029/2011JD016025

  60. Emissions of black carbon, organic, and inorganic aerosols from biomass burning in North America and Asia in 2008 査読有り

    Kondo, Y., H. Matsui, N. Moteki, L. Sahu, N. Takegawa, M. Kajino, Y. Zhao, M. J. Cubison, J. L. Jimenez, S. Vay, G. S. Diskin, B. Anderson, A. Wisthaler, T. Mikoviny, H. E. Fuelberg, D. R. Blake, G. Huey, A. J. Weinheimer, D. J. Knapp, and W. H. Brune

    JOURNAL OF GEOPHYSICAL RESEARCH   116 巻   頁: D08204   2011年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1029/2010JD015152

  61. Seasonal variation of the transport of black carbon aerosol from the Asian continent to the Arctic during the ARCTAS aircraft campaign 査読有り

    Matsui, H., Y. Kondo, N. Moteki, N. Takegawa, L. K. Sahu, Y. Zhao, H. E. Fuelberg, W. R. Sessions, G. Diskin, D. R. Blake, A. Wisthaler, and M. Koike

    JOURNAL OF GEOPHYSICAL RESEARCH   116 巻   頁: D05202   2011年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1029/2010JD015067

  62. Spatial and temporal variations of aerosols around Beijing in summer 2006: 2. Local and column aerosol optical properties 査読有り

    Matsui, H., M. Koike, Y. Kondo, N. Takegawa, J. D. Fast, U. Pöschl, R. M. Garland, M. O. Andreae, A. Wiedensohler, N. Sugimoto, and T. Zhu

    JOURNAL OF GEOPHYSICAL RESEARCH   115 巻   頁: D22207   2010年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1029/2010JD013895

  63. Formation and transport of aerosols in Tokyo in relation to their physical and chemical properties: A review 査読有り

    Kondo, Y., T. Nobuyuki, H. Matsui, T. Miyakawa, M. Koike, Y. Miyazaki, Y. Kanaya, M. Mochida, M. Kuwata, Y. Morino, and M. Shiraiwa

    JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN   88 巻 ( 4 ) 頁: 597-624   2010年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.2151/jmsj.2010-401

    Web of Science

  64. Spatial and temporal variations of aerosols around Beijing in summer 2006: Model evaluation and source apportionment 査読有り

    Matsui, H., M. Koike, Y. Kondo, N. Takegawa, K. Kita, Y. Miyazaki, M. Hu, S.-Y. Chang, D. R. Blake, J. D. Fast, R. A. Zaveri, D. G. Streets, Q. Zhang, and T. Zhu

    JOURNAL OF GEOPHYSICAL RESEARCH   114 巻   頁: D00G13   2009年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1029/2008JD010906

  65. Secondary organic aerosol formation in urban air: Temporal variations and possible contributions from unidentified hydrocarbons 査読有り

    Matsui, H., M. Koike, N. Takegawa, Y. Kondo, R. J. Griffin, Y. Miyazaki, Y. Yokouchi, and T. Ohara

    JOURNAL OF GEOPHYSICAL RESEARCH   114 巻   頁: D04201   2009年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1029/2008JD010164

  66. Seasonal variation of carbon monoxide in northern Japan: Fourier transform IR measurements and source-labeled model calculations 査読有り

    Koike, M., N. B. Jones, P. I. Palmer, H. Matsui, Y. Zhao, Y. Kondo, Y. Matsumi, and H. Tanimoto

    JOURNAL OF GEOPHYSICAL RESEARCH   111 巻   頁: D15306   2006年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    DOI: 10.1029/2005JD006643

▼全件表示

講演・口頭発表等 1

  1. グリーンランド南東ドームアイスコアによる1970年代の硫酸エアロゾル組成とフラックス

    飯塚 芳徳, 植村 立, 松井 仁志, 大島 長, 的場 澄人

    雪氷研究大会講演要旨集  2020年  公益社団法人 日本雪氷学会/日本雪工学会

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    記述言語:日本語   会議種別:口頭発表(一般)  

    <p></p>

共同研究・競争的資金等の研究課題 4

  1. 地球温暖化に関わる北極ブラックカーボンとダスト粒子の動態と放射効果

    2017年4月 - 2020年3月

    環境省環境研究総合推進費・環境問題対応型 

      詳細を見る

    資金種別:競争的資金

  2. エアロゾルの次世代型全球モデルの開発とその気候影響・多圏相互作用に関する研究

    2016年1月 - 2018年1月

    日本学術振興会海外特別研究員制度 

      詳細を見る

    資金種別:競争的資金

  3. 北極気候に関わるブラックカーボン等エアロゾルの動態・発生源と雲・放射影響

    2015年4月 - 2020年3月

    文部科学省環境技術等研究開発推進事業・北極域研究推進プロジェクト(ArCSプロジェクト) 

      詳細を見る

    資金種別:競争的資金

  4. 地球温暖化に関わるブラックカーボン放射効果の総合的評価

    2014年4月 - 2017年3月

    環境省環境研究総合推進費・環境問題対応型 

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    資金種別:競争的資金

科研費 22

  1. 氷河融解を加速する3大光吸収性不純物の定量評価

    研究課題/研究課題番号:20H00196  2020年4月 - 2025年3月

    科学研究費助成事業  基盤研究(A)

    坂井 亜規子, 竹内 望, 青木 輝夫, 的場 澄人, 松井 仁志, 大畑 祥

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    担当区分:研究分担者  資金種別:競争的資金

    アジア高山域において氷河は水資源としての重要な役割を持つが、近年の温暖化による氷河縮小による将来の水資源枯渇が危惧されており、氷河の将来予測を高精度にすることが求められている。氷河の融解に影響を与えるのは気温のみではなく、氷河表面の不純物が日射量の吸収を促進し、融解を加速させることが知られており、氷河変動モデルの高精度化には不純物の影響を考慮することが鍵となる。本研究では代表的な氷河上不純物として鉱物粒子、黒色炭素、雪氷微生物の3つに着目し、氷河表面における各不純物の量の変動、そして各不純物濃度と日射の吸収率との関係についてについて明らかにし、氷河変動流出モデルの高精度化を行う。

  2. 北極におけるエアロゾルの動態と気候影響

    研究課題/研究課題番号:20H00638  2020年4月 - 2024年3月

    科学研究費助成事業  基盤研究(A)

    近藤 豊, 小池 真, 松井 仁志, 大畑 祥, 東 久美子, 森 樹大

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    担当区分:研究分担者  資金種別:競争的資金

    北極の温暖化には、温室効果の増加に加え、エアロゾルによる放射効果も寄与しているが、その不確定性は大きい。エアロゾルの気候影響の理解には、加熱効果のある光吸収性エアロゾルと、冷却効果のある光散乱性エアロゾルの効果の推定が重要である。本研究では、北極エアロゾルの分布・変動と降水除去過程を高精度観測から明らかにする。また、先端的な全球モデルを改良し、北極エアロゾルの気候影響を定量的に解明する。

  3. 植生-エアロゾル-気候間の相互作用解明に向けた欧州北方林エアロゾルの吸湿性解析

    研究課題/研究課題番号:19KK0265  2019年10月 - 2023年3月

    科学研究費補助金  国際共同研究加速基金(国際共同研究強化(B))

    持田 陸宏

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    担当区分:研究分担者  資金種別:競争的資金

    配分額:3133000円 ( 直接経費:2410000円 、 間接経費:723000円 )

    陸域植生から大気に放出される揮発性有機化合物の一部は、光化学反応により生物起源有機エアロゾル(BSOA)となり、雲凝結核としての働きなどにより放射収支に関与し、気候ひいては陸域植生に影響を及ぼすというフィードバック機構を形作ると指摘されている。しかし、エアロゾルの放射影響に関わる有機エアロゾルの吸湿性の推定値には大きな幅があり、BSOAの吸湿性や、その雲粒生成への寄与には大きな不確かさがある。そこで本研究では、北方森林圏を対象としてBSOAの吸湿性とその全エアロゾルの吸湿性に対する寄与を定量する。そして、北方林におけるBSOAの放射への寄与を評価し、上記のフィードバック機構について考察する。
    本研究では、フィンランドのヒューティアラ森林フィールドステーションにおいて大気エアロゾルの採取を行い、その化学組成と吸湿性を解析することで、植生由来の揮発性有機化合物から生成する生物起源二次有機エアロゾル(BSOA)の吸湿性や全エアロゾルの吸湿性に対するBSOAの寄与を定量すること、さらにはBSOAの放射収支への影響の評価や、BSOAが気候、ひいては陸域植生に及ぼすフィードバックを考察することを目標としている。エアロゾルの吸湿性の情報から放射収支への影響を議論する上では、エアロゾルに含まれる界面活性物質による粒子表面張力の低下が雲凝結核能力に及ぼす影響が考慮の対象となり、今年度、国内(名古屋)で採取された大気エアロゾル試料を用いて、この表面張力低下の現象について検討した。具体的には、水で抽出した大気エアロゾル成分の水溶液や硫酸アンモニウムを加えたエアロゾル抽出物の水溶液に対して、懸滴法により表面張力の測定を行い、硫酸アンモニウム・界面活性物質の濃度と表面張力の関係についてデータを得た。この実験結果は、大気エアロゾルの雲凝結核活性の評価において塩析効果をどのように取り扱うかを判断する上で、参考になると考えられる。
    なお、研究代表者の持田は、3月にヘルシンキ大学およびヒューティアラ森林フィールドステーションを訪問することを予定していたが、新型コロナウイルスの感染拡大の問題が発生したため、今年度の訪問を中止した。
    新型コロナウイルスの感染拡大により、研究代表者によるヘルシンキ大学訪問を中止することとなり、ヘルシンキ大学のヒューティアラ森林フィールドステーションにおける観測研究について詳細を議論するには至らなかった。
    新型コロナウィルスの感染拡大のため、ヒューティアラ森林フィールドステーションにおける大気エアロゾル採取の日程調整に至っていない。感染の状況が落ち着いた場合には、試料採取の詳細について相談を進めたい。今後の状況によっては、当初検討していた令和2年度の試料採取を見送り、令和3年度以降の採取に基づいて研究を進めることを検討する可能性がある。

  4. 雲・エアロゾルを介した中緯度大気海洋相互作用

    研究課題/研究課題番号:19H05699  2019年6月 - 2024年3月

    科学研究費補助金  新学術領域研究(研究領域提案型)

    小池 真

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    担当区分:研究分担者  資金種別:競争的資金

    領域研究全体の中で当計画研究の位置づけは、中緯度の大気海洋相互作用の担い手としてエアロゾルという物質科学を導入することである。本研究では、西部北太平洋などの下層雲の変動を、海面温度を含む気象場および海洋からのエアロゾル供給などの観点から,他の海域の下層雲との対比を含めて明らかにする。このために、航空機や船舶の現場観測による微物理プロセス(エアロゾルの雲・降水影響など)の解明、客観解析データ・人工衛星データ解析による各海域での雲量や雲水量の動態解明、そして数値モデルによるエアロゾルや海面温度などの下層雲への影響の定量化という統合的な研究を実施する。
    本計画研究の目的は、西部北太平洋などの下層雲の変動を、海表面温度(SST)を含む気象場および海洋からのエアロゾル供給などの観点から、他の海域の下層雲との対比を含めて明らかにすることである。この目的を達成するために、本研究では3つのサブテーマにより研究を進めている。
    サブテーマ(i) 「雲・エアロゾルの現場観測によるプロセス研究」では、2021年度夏に実施予定の航空機観測・船舶観測で用いるためのエアロゾル観測装置の開発・整備を実施した。とくに粒子の物性(複素屈折率)・形状・粒径分布を同時に実時間測定できる「単一粒子光消散法」の原理を確立した。さらに航空機観測において使用するレーザー光散乱による全エアロゾル粒径分布測定装置を改良するための準備を行った。また船上観測に適したエアロゾル数密度サイズ分布計測機器を選定・購入し、調整したうえで基準機器と比較するなど性能評価を行った。
    サブテーマ(ii) 「客観解析データ・人工衛星データ解析による動態研究」では、衛星データを用いて夏季北西太平洋域の雲の日変化を解析し,中層雲量が早朝に最大となることを明らかにした。またJAXA/GCOM-C衛星搭載のSGLIセンサから得られた雲物理特性のデータプロダクトを用いて、下層雲の微物理過程を水平的にマッピングする手法を開発した。
    サブテーマ(iii) 「数値モデル計算による大気海洋相互作用の評価」では、MIROC数値気候モデルの降雨生成の微物理過程において、サブ格子スケールの雲水の変動を考慮するスキームを開発し、その導入による全球気候への影響を定量的に評価した。また下層雲が亜熱帯高気圧にどのように影響するかを調査した。そして従来言われてきた下層雲の雲頂冷却が亜熱帯高気圧を強化するという説は、最新のモデルでは支持されないことを示した。
    本研究では、現場観測、客観解析データ・人工衛星データ解析、数値モデル計算により、エアロゾル・雲を通じた大気海洋相互作用の研究を進めている。2019年度には、この現場観測のために必要となる各種測定装置の整備を、予定通りにすすめることができた。単一粒子消散法の理論的基礎、装置の基本設計、データ解析手法を確立した。またエアロゾル数密度サイズ分布計測機器の評価結果も良好であった。客観解析データ・人工衛星データ解析では、予定どおりに本プロジェクトの目的である中緯度下層雲の動態を調べるための衛星解析の手法の開発を進めることができた。また気象衛星ひまわり8号のデータ解析から下層雲の日周期の解析を開始した。数値モデル研究では、予定どおりに下層雲の生成・消滅に関わる降雨生成過程の表現を高度化するモデル改良を実施できた。また自然起源の海洋性エアロゾルとアジアの人為起源エアロゾルの下層雲形成に果たす役割を評価するために、海洋からの有機エアロゾルの放出メカニズムを導入する準備を進めた。
    以上のように、本研究はおおむね順調に進展していると言える。
    本研究では、現場観測、客観解析データ・人工衛星データ解析、数値モデル計算により、エアロゾル・雲を通じた大気海洋相互作用の研究を進めている。現場観測では、2021年夏の航空機と船舶の同時観測へ向けての測定器の準備と観測計画の検討を進める。航空機観測においてエアロゾルの詳細な特性を実時間測定するため、航空機搭載型の空気流用の単一粒子消散法の装置を開発する。また船舶観測において大気中の固体エアロゾル・海水中の微粒子をそれぞれ実時間測定するため、水流用の単一粒子消散法の装置を開発する。他の船舶観測で使用する予定の機器についても更なる開発・整備を進めるとともに、これまでに得られた航海観測データを評価し、本研究での主要航海観測に向けた準備を推進する。客観解析データ・人工衛星データ解析では、開発した衛星解析手法を本課題の対象である西部北太平洋の下層雲に適用し、その微物理過程が海水面温度(SST)やエアロゾルにどのように関係しているのか調べる。またひまわり衛星データの解析により、下層雲の日周期変動の動態把握を進めるとともに,黒潮上の梅雨前線帯の雲降水系の日変化の機構を明らかにする。数値モデル研究では、改良されたMIROC数値気候モデルを用いて、西部北太平洋を含む様々な領域において、下層雲がエネルギー収支にもたらす影響を定量的に評価する。また海洋からの有機エアロゾルの放出メカニズムを全球エアロゾルモデルに導入し、その下層雲への影響を評価する。

  5. 大気有機エアロゾルの吸湿性に対する定量的理解の深化―化学構造・起源との関係―

    研究課題/研究課題番号:19H04253  2019年4月 - 2022年3月

    科学研究費助成事業  基盤研究(B)

    持田 陸宏, 松井 仁志, 宮崎 雄三, 大畑 祥

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    担当区分:研究分担者  資金種別:競争的資金

    気候変動の理解と予測に向けた喫緊の課題である、大気エアロゾルの放射影響評価では、主要エアロゾル成分である有機物の吸湿性の情報が必要となる。本研究では、エアロゾル試料を分画して吸湿性と化学構造を解析し、有機物の吸湿性と化学構造、そして化学構造を規定する起源との関係を明らかにすることで、有機エアロゾルの吸湿性に対する定量的理解を深化させることを目指す。
    本研究では、大気エアロゾル試料の抽出物を用いて、エアロゾルに含まれる有機物(有機エアロゾル)の化学構造と起源の関係や、有機エアロゾルの化学構造を規定する起源と吸湿性の関係を明らかにすることを目指している。この取り組みの一環として、都市エアロゾル試料の抽出物(フミン様物質などの複数の画分)を噴霧し、発生した粒子を高分解能飛行時間型エアロゾル質量分析計に導入して抽出物の質量スペクトルを測定した。また、抽出物に含まれる有機物の定量のため、標準物質としてフタル酸を混合した抽出物に対しても質量スペクトルの測定を行った。さらに、有機物に由来するスペクトル信号に対してpositive matrix factorization(PMF)による解析を行い、バイオマス燃焼起源、調理由来、化石燃料起源と考えられる有機エアロゾルと、含酸素度の異なる2種類の有機エアロゾルの合わせて5種類の有機エアロゾルに対応すると考えられる因子を得た。これらの分析・解析により、今後、抽出物に対する吸湿性測定に基づき、有機エアロゾルの吸湿性と化学構造や起源との関係を知る上で有用なデータを得ることができた。
    これらの取り組みのほか、乾燥状態における微粒子の粒径に対する加湿時の粒径の比(吸湿成長度)を測定する装置である吸湿タンデムDMAを用いた検討も行った。また、様々な起源の有機エアロゾルの吸湿性の違いや、大気中での酸化過程等に伴う吸湿性の変化を計算できるように、全球エアロゾルモデル計算の準備をし、改良に着手した。
    エアロゾル抽出物の吸湿性の解析に関係する実験が大きくは進まなかった。この原因の一つに、吸湿タンデムDMAのコンディションの問題があった。
    吸湿タンデムDMAによるエアロゾル抽出物の吸湿性測定を速やかに実施し、有機エアロゾルの化学構造と吸湿性の比較に基づく解析を早期に開始することを目指す。

  6. 全球モデルを用いたダストの発生源分布と長距離輸送過程の高精度化についての研究

    研究課題/研究課題番号:31C2005  2019年4月 - 2021年3月

    鳥取大学乾燥地研究センター共同研究  一般研究

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    担当区分:研究代表者  資金種別:競争的資金

    配分額:460000円 ( 直接経費:460000円 )

  7. 光吸収性エアロゾルの混合状態を解像した全球エアロゾルモデルの開発と気候影響評価

    研究課題/研究課題番号:17H04709  2017年4月 - 2021年3月

    科学研究費補助金  若手研究(A)

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    担当区分:研究代表者  資金種別:競争的資金

    配分額:22490000円 ( 直接経費:17300000円 、 間接経費:5190000円 )

  8. 光吸収性エアロゾルの混合状態を解像した全球エアロゾルモデルの開発と気候影響評価

    2017年4月 - 2021年3月

    日本学術振興会  科学研究費助成事業  若手研究(A)

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    資金種別:競争的資金

  9. 地球温暖化に関わる北極ブラックカーボンとダスト粒子の動態と放射効果

    研究課題/研究課題番号:2-1703  2017年4月 - 2020年3月

    環境省  環境省環境研究総合推進費・環境問題対応型 

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    資金種別:競争的資金

    配分額:8255000円 ( 直接経費:6350000円 、 間接経費:1905000円 )

  10. 北極の気候影響に関わるブラックカーボンの挙動の解明

    研究課題/研究課題番号:16H01770  2016年4月 - 2020年3月

    科学研究費補助金  基盤研究(A)

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    担当区分:研究分担者 

    配分額:2340000円 ( 直接経費:1800000円 、 間接経費:540000円 )

  11. 北極の気候影響に関わるブラックカーボンの挙動の解明

    2016年4月 - 2020年3月

    日本学術振興会  科学研究費助成事業  基盤研究(A)

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    資金種別:競争的資金

  12. 発生源地域におけるアジアダストと環境レジームシフトの国際共同研究

    研究課題/研究課題番号:16H02703  2016年4月 - 2019年3月

    科学研究費助成事業  基盤研究(A)

    甲斐 憲次, 杉本 伸夫, 牧 輝弥, 星野 仏方, 竹見 哲也, 篠田 雅人, 山口 靖, 松井 仁志, 河合 慶

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    担当区分:研究分担者  資金種別:競争的資金

    配分額:390000円 ( 直接経費:300000円 、 間接経費:90000円 )

    近年、アジアダストの発生、それらと共に飛来するバイオエアロゾルやPM2.5などが国際的な環境問題を引き起こしている。本研究では、JSPS研究拠点形成事業「アジアダストと環境レジームシフトに関する研究拠点の構築」で整備した研究拠点ネットワークを活用し、発生源地域のモンゴル草原・ゴビ砂漠および風下側の能登半島・北海道等で集中観測を実施した。新たな試みとして、バイオエアロゾルを環境レジームシフトのマーカーとして用いた。ダストストームによるアジアダストの巻き上げ、大気境界層から自由対流圏への輸送プロセス、さらには環境レジームシフトの兆候、バイオエアロゾルの付着の有無に関して新たな知見を得た。
    モンゴル草原・ゴビ砂漠は前世紀まで観測の空白域であり、近年は地球温暖化と人間活動の影響により、環境レジームシフトの兆候が見られるようになった。環境レジームシフトは、動植物を含む生態系の急激な劣化を伴うので、喫緊の環境問題である。本研究では、発生源地域におけるアジアダストの舞上りと輸送プロセス、さらにはバイオエアロゾルの付着の有無を解明しようとした。これらの情報は、アジアダストの発生・越境汚染・影響評価の解明に貢献するものである。また、遺伝子レベルの解析を行い、バイオエアロゾルを環境レジームシフトのマーカーとして使用する方法の確立を目指す点も新しい。

  13. エアロゾルの次世代型全球モデルの開発とその気候影響・多圏相互作用に関する研究

    2016年1月 - 2018年1月

    日本学術振興会  日本学術振興会海外特別研究員制度 

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    資金種別:競争的資金

  14. 北極気候に関わるブラックカーボン等エアロゾルの動態・発生源と雲・放射影響

    2015年4月 - 2020年3月

    文部科学省  文部科学省環境技術等研究開発推進事業・北極域研究推進プロジェクト(ArCSプロジェクト) 

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    資金種別:競争的資金

  15. 次世代型エアロゾル統合モデルの開発による直接・間接効果の高精度評価

    研究課題/研究課題番号:26740014  2014年4月 - 2018年3月

    科学研究費補助金  若手研究(B)

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    担当区分:研究代表者  資金種別:競争的資金

    配分額:3900000円 ( 直接経費:3000000円 、 間接経費:900000円 )

  16. 東アジアの人為起源エアロゾルの間接効果

    2014年4月 - 2018年3月

    科学研究費補助金  基盤研究(A)

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    担当区分:研究分担者 

  17. 東アジアの人為起源エアロゾルの間接効果

    研究課題/研究課題番号:26241003  2014年4月 - 2018年3月

    小池 真

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    担当区分:研究分担者  資金種別:競争的資金

    雲粒はエアロゾル(大気中を浮遊する微粒子)を核として生成するため、人為起源エアロゾルの増加は雲にさまざまな影響を与える可能性がある。本研究では人工衛星データの解析から、東シナ海の黒潮という温暖な海水が、冬季の大陸からの寒気の吹き出し時に境界層を不安定化させ、上昇流を強化させることにより、人為起源エアロゾルの雲への影響を増幅させていることを明らかにした。また航空機観測データの解析からもエアロゾルと雲・降水の関係を示し、数値モデルを改良することにより、観測から明らかになったエアロゾルや温暖な海水の雲への影響を再現することに成功した。

  18. 次世代型エアロゾル統合モデルの開発による直接・間接効果の高精度評価

    研究課題/研究課題番号:26740014  2014年4月 - 2018年3月

    松井 仁志

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    担当区分:研究代表者  資金種別:競争的資金

    配分額:3900000円 ( 直接経費:3000000円 、 間接経費:900000円 )

    大気中の微粒子(エアロゾル)の放射・雲を介した気候影響は、気候変動予測における最大の不確定要因の1つである。エアロゾルの気候影響を精度良く評価するため、エアロゾルの数濃度・粒径分布・各粒子の化学組成を十分に表現できる次世代型のエアロゾルモデルを開発した。様々な大気観測によってモデルを検証した後、ブラックカーボン(すす)の大気加熱効果とその不確定性要因や、エアロゾルの過去から将来の排出量変化に対する応答などを、関連する微物理・化学過程の観点から明らかにした。

  19. 東アジアの人為起源エアロゾルの間接効果

    2014年4月 - 2018年3月

    日本学術振興会  科学研究費助成事業  基盤研究(A)

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    資金種別:競争的資金

  20. 次世代型エアロゾル統合モデルの開発による直接・間接効果の高精度評価

    2014年4月 - 2018年3月

    日本学術振興会  科学研究費助成事業  若手研究(B)

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    資金種別:競争的資金

  21. 地球温暖化に関わるブラックカーボン放射効果の総合的評価

    2014年4月 - 2017年3月

    環境省  環境省環境研究総合推進費・環境問題対応型 

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    資金種別:競争的資金

  22. アジアのエアロゾル・雲・降水システムの観測・モデルによる統合的研究

    2011年4月 - 2015年3月

    科学研究費補助金  基盤研究(S)

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    担当区分:研究分担者 

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