Updated on 2022/05/23

写真a

 
KONDO Masayuki
 
Organization
Institute for Space-Earth Environmental Research Division for Land-Ocean Ecosystem Research Designated assistant professor
Title
Designated assistant professor
Contact information
メールアドレス
External link

Degree 3

  1. Ph.D. in Agricultural Science ( 2015.9   Hokkaido University ) 

  2. Master of Science in Physics ( 2007.12 ) 

  3. Bachelor of Science in Physics ( 2006.12 ) 

Research Interests 14

  1. リモートセンシング

  2. 数値モデリング

  3. 気候変動科学

  4. 物質循環

  5. Net CO2 balance

  6. Multi-method Synthesis

  7. Ecosystem Modelling

  8. Carbon Cycle

  9. Climate Change

  10. Plant regrowth

  11. Southeast Asia

  12. Land-use change

  13. Photosynthesis

  14. Remote Sensing

Research Areas 3

  1. Natural Science / Human geosciences  / Land-use change

  2. Natural Science / Atmospheric and hydrospheric sciences  / Biogeochemical Cycle

  3. Environmental Science/Agriculture Science / Environmental dynamic analysis

Research History 6

  1. Nagoya University   Institute for Space and Earth Environmental Research   Designated assistant professor

    2021.4

  2. 国立環境研究所   地球環境研究センター   特別研究員

    2020.4 - 2021.3

  3. Chiba University

    2017.4 - 2019.3

  4. 海洋研究開発機構   地球表層物質循環分野   地球表層物質循環分野 特任技術主事(助教相当)

    2015.4 - 2016.3

  5. 海洋研究開発機構   地球表層物質循環分野   地球表層物質循環分野 技術支援職

    2014.5 - 2015.3

  6. Fukushima University

    2010.6 - 2014.4

▼display all

Education 2

  1. Hokkaido University

    2015.9

  2. テキサス大学ダラス校   大学院物理学科高エネルギー物理学専攻 博士課程

    2008.1 - 2010.5

Professional Memberships 3

  1. JAPAN GEOSCIENCE UNION

  2. アメリカ地球物理学会

  3. アジア-オセアニア地球科学連合

Awards 1

  1. Kamide Lecture Award

    2019.8   Asia Oceania Geosciences Society   The role of CO2 release and uptake induced by land use changes in recent terrestrial carbon balance

    Masayuki Kondo

 

Papers 25

  1. Are Land‐Use Change Emissions in Southeast Asia Decreasing or Increasing? Reviewed International coauthorship

    Masayuki Kondo, Stephen Sitch, Philippe Ciais, Frédéric Achard, Etsushi Kato, Julia Pongratz, Richard A. Houghton, Josep G. Canadell, Prabir K. Patra, Pierre Friedlingstein, Wei Li, Peter Anthoni, Almut Arneth, Frédéric Chevallier, Raphael Ganzenmüller, Anna Harper, Atul K. Jain, Charles Koven, Sebastian Lienert, Danica Lombardozzi, Takashi Maki, Julia E. M. S. Nabel, Takashi Nakamura, Yosuke Niwa, Philippe Peylin, Benjamin Poulter, Thomas A. M. Pugh, Christian Rödenbeck, Tazu Saeki, Benjamin Stocker, Nicolas Viovy, Andy Wiltshire, Sönke Zaehle

    Global Biogeochemical Cycles   Vol. 36 ( 1 )   2022.1

     More details

    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:American Geophysical Union ({AGU})  

    DOI: 10.1029/2020GB006909

    Scopus

  2. State of the science in reconciling top-down and bottom-up approaches for terrestrial CO<inf>2</inf> budget Reviewed International coauthorship

    Kondo, M., Patra, P.K., Sitch, S., Friedlingstein, P., Poulter, B., Chevallier, F., Ciais, P., Canadell, J.G., Bastos, A., Lauerwald, R., Calle, L., Ichii, K., Anthoni, P., Arneth, A., Haverd, V., Jain, A.K., Kato, E., Kautz, M., Law, R.M., Lienert, S., Lombardozzi, D., Maki, T., Nakamura, T., Peylin, P., Rödenbeck, C., Zhuravlev, R., Saeki, T., Tian, H., Zhu, D., Ziehn, T.

    Global Change Biology   Vol. 26 ( 3 ) page: 1068 - 1084   2020

     More details

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

    DOI: 10.1111/gcb.14917

    Web of Science

    Scopus

    PubMed

  3. Land use change and El Niño-Southern Oscillation drive decadal carbon balance shifts in Southeast Asia Reviewed International coauthorship

    Masayuki Kondo, Kazuhito Ichii, Prabir K. Patra, Joseph G. Canadell, Benjamin Poulter, Stephen Sitch, Leonardo Calle, Yi Y. Liu, Albert I. J. M. van Dijk, Tazu Saeki, Nobuko Saigusa, Pierre Friedlingstein, Almut Arneth, Anna Harper, Atul K. Jain, Etsushi Kato, Charles Koven, Fang Li, Thomas A. M. Pugh, Sönke Zaehle, Andy Wiltshire, Frederic Chevallier, Takashi Maki, Takashi Nakamura, Yosuke Niwa, Christian Rödenbeck

    Nature Communications   Vol. 9 ( 1 ) page: 1154   2018.12

     More details

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

    An integrated understanding of the biogeochemical consequences of climate extremes and land use changes is needed to constrain land-surface feedbacks to atmospheric CO2 from associated climate change. Past assessments of the global carbon balance have shown particularly high uncertainty in Southeast Asia. Here, we use a combination of model ensembles to show that intensified land use change made Southeast Asia a strong source of CO2 from the 1980s to 1990s, whereas the region was close to carbon neutral in the 2000s due to an enhanced CO2 fertilization effect and absence of moderate-to-strong El Niño events. Our findings suggest that despite ongoing deforestation, CO2 emissions were substantially decreased during the 2000s, largely owing to milder climate that restores photosynthetic capacity and suppresses peat and deforestation fire emissions. The occurrence of strong El Niño events after 2009 suggests that the region has returned to conditions of increased vulnerability of carbon stocks.

    DOI: 10.1038/s41467-018-03374-x

    Web of Science

    Scopus

    PubMed

  4. Plant Regrowth as a Driver of Recent Enhancement of Terrestrial CO2 Uptake Reviewed International coauthorship

    Masayuki Kondo, Kazuhito Ichii, Prabir K. Patra, Benjamin Poulter, Leonardo Calle, Charles Koven, Thomas A. M. Pugh, Etsushi Kato, Anna Harper, Sönke Zaehle, Andy Wiltshire

    Geophysical Research Letters   Vol. 45 ( 10 ) page: 4820 - 4830   2018.5

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Geophysical Union ({AGU})  

    The increasing strength of land CO2 uptake in the 2000s has been attributed to a stimulating effect of rising atmospheric CO2 on photosynthesis (CO2 fertilization). Using terrestrial biosphere models, we show that enhanced CO2 uptake is induced not only by CO2 fertilization but also an increasing uptake by plant regrowth (accounting for 0.33 ± 0.10 Pg C/year increase of CO2 uptake in the 2000s compared with the 1960s–1990s) with its effect most pronounced in eastern North America, southern-eastern Europe, and southeastern temperate Eurasia. Our analysis indicates that ecosystems in North America and Europe have established the current productive state through regrowth since the 1960s, and those in temperate Eurasia are still in a stage from regrowth following active afforestation in the 1980s–1990s. As the strength of model representation of CO2 fertilization is still in debate, plant regrowth might have a greater potential to sequester carbon than indicated by this study.

    DOI: 10.1029/2018GL077633

    Web of Science

    Scopus

  5. Comparison of the data-driven top-down and bottom-up global terrestrial CO2 exchanges: GOSAT CO2 inversion and empirical eddy flux upscaling Reviewed

    Masayuki Kondo, Kazuhito Ichii, Hiroshi Takagi, Motoki Sasakawa

    JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES   Vol. 120 ( 7 ) page: 1226 - 1245   2015.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:AMER GEOPHYSICAL UNION  

    We examined the consistency between terrestrial biosphere fluxes (terrestrial CO2 exchanges) from data-driven top-down (GOSAT CO2 inversion) and bottom-up (empirical eddy flux upscaling based on a support vector regression (SVR) model) approaches over 42 global terrestrial regions from June 2009 to October 2011. Seasonal variations of the biosphere fluxes by the two approaches agreed well in boreal and temperate regions across the Northern Hemisphere. Both fluxes also exhibited strong anomalous signals in response to contrasting anomalous spring temperatures observed in North America and boreal Eurasia. This indicates that the CO2 concentration data integrated in the GOSAT inversion and the meteorological and vegetation data in the SVR models are equally effective in producing spatiotemporal variations of biosphere flux. Meanwhile, large differences in seasonality were found in subtropical and tropical South America, South Asia, and Africa. The GOSAT inversion showed seasonal variations that pivoted around CO2 neutral, while the SVR model showed seasonal variations that tended toward CO2 sink. Thus, a large difference in CO2 budget was identified between the two approaches in subtropical and tropical regions across the Southern Hemisphere. Examination of the integrated data revealed that the large tropical sink of CO2 by the SVR model was an artifact due to the underrepresented biosphere fluxes predicted by limited eddy flux data for tropical biomes. Because of the global coverage of CO2 concentration data, the GOSAT inversion provides better estimates of continental CO2 flux than the SVR model in the Southern Hemisphere.

    DOI: 10.1002/2014JG002866

    Web of Science

    Scopus

  6. Evaluation of earth system model and atmospheric inversion using total column CO2 observations from GOSAT and OCO-2 Reviewed

    Prabir K. Patra, Tomohiro Hajima, Ryu Saito, Naveen Ch, ra, Yukio Yoshida, Kazuhito Ichii, Michio Kawamiya, Masayuki Kondo, Akihiko Ito, David Crisp

    Progress in Earth and Planetary Science   Vol. 8 ( 1 ) page: 25   2021.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media {LLC}  

    The measurements of one of the major greenhouse gases, carbon dioxide (CO ), are being made using dedicated satellite remote sensing since the launch of the greenhouse gases observing satellite (GOSAT) by a three-way partnership between the Japan Aerospace Exploration Agency (JAXA), the Ministry of Environment (MoE) and the National Institute for Environmental Studies (NIES), and the National Aeronautics and Space Administration (NASA) Orbiting Carbon Observatory-2 (OCO-2). In the past 10 years, estimation of CO fluxes from land and ocean using the earth system models (ESMs) and inverse modelling of in situ atmospheric CO data have also made significant progress. We attempt, for the first time, to evaluate the CO fluxes simulated by an earth system model (MIROC-ES2L) and the fluxes estimated by an inverse model (MIROC4-Inv) using in situ data by comparing with GOSAT and OCO-2 observations. Both MIROC-ES2L and MIROC4-Inv fluxes are used in the MIROC4-atmospheric chemistry transport model (referred to as ACTM_ES2LF and ACTM_InvF, respectively) for calculating total column CO mole fraction (XCO ) that are sampled at the time and location of the satellite measurements. Both the ACTM simulations agreed well with the GOSAT and OCO-2 satellite observations, within 2 ppm for the spatial maps and time evolutions of the zonal mean distributions. Our results suggest that the inverse model using in situ data is more consistent with the OCO-2 retrievals, compared with those of the GOSAT XCO data due to the higher accuracy of the former. This suggests that the MIROC4-Inv fluxes are of sufficient quality to evaluate MIROC-ES2L simulated fluxes. The ACTM_ES2LF simulation shows a slightly weaker seasonal cycle for the meridional profiles of CO fluxes, compared with that from the ACTM_InvF. This difference is revealed by greater XCO differences for ACTM_ES2LF vs GOSAT, compared with those of ACTM_InvF vs GOSAT. Using remote sensing–based global products of leaf area index (LAI) and gross primary productivity (GPP) over land, we show a weaker sensitivity of MIROC-ES2L biospheric activities to the weather and climate in the tropical regions. Our results clearly suggest the usefulness of XCO measurements by satellite remote sensing for evaluation of large-scale ESMs, which so far remained untested by the sparse in situ data. [Figure not available: see fulltext.]. 2 2 2 2 2 2 2 2 2 2

    DOI: 10.1186/s40645-021-00420-z

    DOI: 10.1186/s40645-021-00420-z

    Scopus

  7. Decadal variability in land carbon sink efficiency Reviewed

    Lei Zhu, Philippe Ciais, Ana Bastos, Ashley P. Ballantyne, Frederic Chevallier, Thomas Gasser, Masayuki Kondo, Julia Pongratz, Christian Rödenbeck, Wei Li

    Carbon Balance and Management   Vol. 16 ( 1 ) page: 15   2021.12

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media {LLC}  

    <jats:title>Abstract</jats:title><jats:sec>
    <jats:title>Background</jats:title>
    <jats:p>The climate mitigation target of limiting the temperature increase below 2 °C above the pre-industrial levels requires the efforts from all countries. Tracking the trajectory of the land carbon sink efficiency is thus crucial to evaluate the nationally determined contributions (NDCs). Here, we define the instantaneous land sink efficiency as the ratio of natural land carbon sinks to emissions from fossil fuel and land-use and land-cover change with a value of 1 indicating carbon neutrality to track its temporal dynamics in the past decades.</jats:p>
    </jats:sec><jats:sec>
    <jats:title>Results</jats:title>
    <jats:p>Land sink efficiency has been decreasing during 1957–1990 because of the increased emissions from fossil fuel. After the effect of the Mt. Pinatubo eruption diminished (after 1994), the land sink efficiency firstly increased before 2009 and then began to decrease again after 2009. This reversal around 2009 is mostly attributed to changes in land sinks in tropical regions in response to climate variations.</jats:p>
    </jats:sec><jats:sec>
    <jats:title>Conclusions</jats:title>
    <jats:p>The decreasing trend of land sink efficiency in recent years reveals greater challenges in climate change mitigation, and that climate impacts on land carbon sinks must be accurately quantified to assess the effectiveness of regional scale climate mitigation policies.</jats:p>
    </jats:sec>

    DOI: 10.1186/s13021-021-00178-3

    Scopus

    PubMed

  8. 陸域炭素収支量の推定におけるトップダウン・ボトムアップアプローチ

    近藤雅征

    PETROTECH   ( 43 ) page: 722 - 726   2020.11

     More details

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

  9. 2000年代の陸域CO2吸収量が過去100年間で最大!過去の大規模土地利用変化から回復した植生が原因の一つ Invited

    近藤雅征

    千葉大学サステナビリティレポート2019     page: 15 - 15   2019

     More details

    Language:Japanese  

  10. Terrestrial Energy, Water, and Carbon Flux Estimation Using Machine Learning Algorithms

    ICHII Kazuhito, WATANABE Hiroyuki, TANIGUCHI Hirotomo, UEYAMA Masahito, KONDO Masayuki

    Journal of The Remote Sensing Society of Japan   Vol. 38 ( 2 ) page: 114 - 120   2018.4

     More details

    Language:Japanese   Publisher:The Remote Sensing Society of Japan  

    <p>Using the machine learning technique with the wider availability of various observation data, the integration of ground observation data and satellite observation data has been advancing. In recent years, these techniques were applied to studies of terrestrial energy, water, and carbon cycles to estimate their spatial and temporal variations by upscaling. In this article, we provide an overview of the upscaling technique using machine learning and discuss potential applications of the dataset to terrestrial biosphere studies.</p>

    DOI: 10.11440/rssj.38.114

    CiNii Research

    J-GLOBAL

  11. Current status of empirical estimates of terrestrial carbon and water cycles using eddy-covariance network and remote sensing data Invited Reviewed

    Ichii K., Kondo M., Ueyama M.

    iLEAPS newsletter special issue Asia     page: 4 - 10   2018

  12. New data-driven estimation of terrestrial CO2 fluxes in Asia using a standardized database of eddy covariance measurements, remote sensing data, and support vector regression Reviewed

    Kazuhito Ichii, Masahito Ueyama, Masayuki Kondo, Nobuko Saigusa, Joon Kim, Ma. Carmelita Alberto, Jonas Ardö, Eugénie S. Euskirchen, Minseok Kang, Takashi Hirano, Joanna Joiner, Hideki Kobayashi, Luca Belelli Marchesini, Lutz Merbold, Akira Miyata, Taku M. Saitoh, Kentaro Takagi, Andrej Varlagin, M. Syndonia Bret-Harte, Kenzo Kitamura, Yoshiko Kosugi, Ayumi Kotani, Kireet Kumar, Sheng-Gong Li, Takashi Machimura, Yojiro Matsuura, Yasuko Mizoguchi, Takeshi Ohta, Sandipan Mukherjee, Yuji Yanagi, Yukio Yasuda, Yiping Zhang, Fenghua Zhao

    Journal of Geophysical Research: Biogeosciences   Vol. 122 ( 4 ) page: 767 - 795   2017.4

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:American Geophysical Union ({AGU})  

    The lack of a standardized database of eddy covariance observations has been an obstacle for data-driven estimation of terrestrial CO2 fluxes in Asia. In this study, we developed such a standardized database using 54 sites from various databases by applying consistent postprocessing for data-driven estimation of gross primary productivity (GPP) and net ecosystem CO2 exchange (NEE). Data-driven estimation was conducted by using a machine learning algorithm: support vector regression (SVR), with remote sensing data for 2000 to 2015 period. Site-level evaluation of the estimated CO2 fluxes shows that although performance varies in different vegetation and climate classifications, GPP and NEE at 8days are reproduced (e.g., r(2)=0.73 and 0.42 for 8day GPP and NEE). Evaluation of spatially estimated GPP with Global Ozone Monitoring Experiment 2 sensor-based Sun-induced chlorophyll fluorescence shows that monthly GPP variations at subcontinental scale were reproduced by SVR (r(2)=1.00, 0.94, 0.91, and 0.89 for Siberia, East Asia, South Asia, and Southeast Asia, respectively). Evaluation of spatially estimated NEE with net atmosphere-land CO2 fluxes of Greenhouse Gases Observing Satellite (GOSAT) Level 4A product shows that monthly variations of these data were consistent in Siberia and East Asia; meanwhile, inconsistency was found in South Asia and Southeast Asia. Furthermore, differences in the land CO2 fluxes from SVR-NEE and GOSAT Level 4A were partially explained by accounting for the differences in the definition of land CO2 fluxes. These data-driven estimates can provide a new opportunity to assess CO2 fluxes in Asia and evaluate and constrain terrestrial ecosystem models.

    DOI: 10.1002/2016jg003640

    Web of Science

    Scopus

  13. Comprehensive synthesis of spatial variability in carbon flux across monsoon Asian forests Reviewed

    Masayuki Kondo, Taku M. Saitoh, Hisashi Sato, Kazuhito Ichii

    Agricultural and Forest Meteorology   Vol. 232   page: 623 - 634   2017.1

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier {BV}  

    Forest ecosystems sequester large amounts of atmospheric CO2, and the contribution from forests in Asia is not negligible. Previous syntheses of carbon fluxes in Asian ecosystems mainly employed estimates of eddy covariance measurements, net ecosystem production (NEP), gross primary production (GPP), and ecosystem respiration (RE); however, to understand the variability within carbon cycles, fluxes such as autotropic respiration (AR), net primary, production (NPP), litterfall, heterotrophic respiration (HR), and soil respiration (SR) need to be analyzed comprehensively in conjunction with NEP, GPP, and RE. Here we investigated the spatial variability of component fluxes of carbon balance (GPP, AR, NPP, litterfall, HR, SR, and RE) in relation to climate factors, between carbon fluxes, and to NEP using observations compiled from the literature for 22 forest sites in monsoon Asia. We found that mean annual temperature (MAT) largely relates to the spatial variability of component fluxes in monsoon Asian forests, with stronger positive effect in the mid-high latitude forests than in the low latitude forests, but even stronger relationships were identified between component fluxes regardless of regions. This finding suggests that the spatial variability of carbon fluxes in monsoon Asia is certainly influenced by climatic factors such as MAT, but that the overall spatial variability of AR, NPP, litterfall, HR, SR, and RE is rather controlled by that of productivity (i.e., GPP). Furthermore, component fluxes of the mid-high and low latitude forests showed positive and negative relationships, respectively, with NEP. Further investigation identified a common spatial variability in NEP and annual aboveground biomass changes with respect to GPP. The relationship between GPP and NEP in the mid-high latitudes implies that productivity and net carbon sequestration increase simultaneously in boreal and temperate forests. Meanwhile, the relationship between GPP and NEP in the low latitudes indicates that net carbon sequestration decreases with productivity, potentially due to the regional contrast in nitrogen depositions and stand age within sub-tropical and tropical forests; however, it requires further data syntheses or modelling investigations for confirmation of its general validity. These unique features of monsoon Asian forest carbon fluxes provide useful information for improving ecosystem model simulations, which still differ in their predictability of carbon flux variability. (C) 2016 The Authors. Published by Elsevier B.V.

    DOI: 10.1016/j.agrformet.2016.10.020

    Web of Science

    Scopus

  14. Regional carbon fluxes from land use and land cover change in Asia, 1980-2009 Reviewed

    Leonardo Calle, Josep G. Canadell, Prabir Patra, Philippe Ciais, Kazuhito Ichii, Hanqin Tian, Masayuki Kondo, Shilong Piao, Almut Arneth, Anna B. Harper, Akihiko Ito, Etsushi Kato, Charlie Koven, Stephen Sitch, Benjamin D. Stocker, Nicolas Vivoy, Andy Wiltshire, Soenke Zaehle, Benjamin Poulter

    ENVIRONMENTAL RESEARCH LETTERS   Vol. 11 ( 7 ) page: 074011   2016.7

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP PUBLISHING LTD  

    We present a synthesis of the land-atmosphere carbon flux from land use and land cover change (LULCC) in Asia using multiple data sources and paying particular attention to deforestation and forest regrowth fluxes. The data sources are quasi-independent and include the U.N. Food andAgriculture Organization-Forest Resource Assessment (FAO-FRA2015; country-level inventory estimates), the Emission Database for Global Atmospheric Research (EDGARv4.3), the 'Houghton' bookkeeping model that incorporates FAO-FRA data, an ensemble of 8 state-of-the-art Dynamic Global Vegetation Models (DGVM), and 2 recently published independent studies using primarily remote sensing techniques. The estimates are aggregated spatially to Southeast, East, and South Asia and temporally for three decades, 1980-1989, 1990-1999 and 2000-2009. Since 1980, net carbon emissions from LULCC in Asia were responsible for 20%-40% of global LULCC emissions, with emissions from Southeast Asia alone accounting for 15%-25% of global LULCC emissions during the same period. In the 2000s and for all Asia, three estimates (FAO-FRA, DGVM, Houghton) were in agreement of a net source of carbon to the atmosphere, with mean estimates ranging between 0.24 to 0.41 Pg Cyr(-1), whereas EDGARv4.3 suggested a net carbon sink of -0.17 Pg Cyr(-1). Three of 4 estimates suggest that LULCC carbon emissions declined by at least 34% in the preceding decade (1990-2000). Spread in the estimates is due to the inclusion of different flux components and their treatments, showing the importance to include emissions from carbon rich peatlands and land management, such as shifting cultivation and wood harvesting, which appear to be consistently underreported.

    DOI: 10.1088/1748-9326/11/7/074011

    Web of Science

  15. The Effect of GOSAT Observations on Estimates of Net CO<sub>2</sub> Flux in Semi-Arid Regions of the Southern Hemisphere

    Kondo Masayuki, Saeki Tazu, Takagi Hiroshi, Ichii Kazuhito, Ishijima Kentaro

    SOLA   Vol. 12 ( 0 ) page: 181 - 186   2016

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Meteorological Society of Japan  

    <p>Greenhouse gases Observing SATellite (GOSAT) is the operational satellite dedicated to atmospheric CO<sub>2</sub> observations. Assimilation of data provided by GOSAT is expected to yield reliable CO<sub>2</sub> fluxes in semi-arid regions because of frequent observations owing to clear skies. Here we estimated net CO<sub>2</sub> flux over semi-arid regions of the Southern Hemisphere using the GOSAT column averaged CO<sub>2</sub> (X<sub>CO2</sub>) and surface CO<sub>2</sub> measurements. Assimilation of GOSAT X<sub>CO2</sub> indicated that semi-arid regions are integral components of recent terrestrial CO<sub>2</sub> uptake, accounting for 44% globally. Compared with estimates assimilated from surface measurements, estimates by GOSAT X<sub>CO2</sub> suggest a 50% reduction in the semi-arid CO<sub>2</sub> uptake, amounting to 1.1 Pg C yr<sup>−1</sup>. Significant estimation differences occurred for South America and South Africa, where the GOSAT makes frequent measurements but where surface CO<sub>2</sub> measurements are limited. In comparison, the two estimates varied less in Australia, where more surface measurements are available. These results suggest that GOSAT X<sub>CO2</sub> is effective at regulating excess estimates of semi-arid CO<sub>2</sub> uptake in regions that are less constrained by surface CO<sub>2</sub> measurements. To promote understanding of climate change effects in semi-arid regions, it is important to continue monitoring trends in CO<sub>2</sub> uptake with GOSAT.</p>

    DOI: 10.2151/sola.2016-037

    Web of Science

    Scopus

    CiNii Research

  16. Satellite-based detection of evacuation-induced land cover changes following the Fukushima Daiichi nuclear disaster Reviewed

    Ryo Sekizawa, Kazuhito Ichii, Masayuki Kondo

    REMOTE SENSING LETTERS   Vol. 6 ( 11 ) page: 824 - 833   2015.11

     More details

    Publishing type:Research paper (scientific journal)   Publisher:TAYLOR & FRANCIS LTD  

    The Great East Japan Earthquake and Tsunami on 11 March 2011 led to the Fukushima Daiichi nuclear disaster. The Japanese government subsequently outlined an evacuation zone around the power plant, and all residents were evacuated. In the absence of cropland or urban vegetation management, land cover was expected to change. The changes in vegetation cover following the nuclear disaster are presented using long-term time series data obtained from Moderate Resolution Imaging Spectroradiometer (MODIS) sensors. Utilizing MODIS 250m spatial resolution observations, clear signals of vegetation changes were detected following the disaster in 2011. The areas affected were non-forest regions (mostly paddy fields) within the 20km radius evacuation zone around the power plant. Multi-year comparisons of vegetation seasonality indicated that the changes can be explained by the natural succession of abandoned cropland. The affected area within the 20km radius is equivalent to about 20% of the total area affected by the tsunami.

    DOI: 10.1080/2150704X.2015.1076207

    Web of Science

  17. Impact of anomalous climates on carbon allocation to biomass production of leaves, woody components, and fine roots in a cool-temperate deciduous forest Reviewed

    Masayuki Kondo, Kazuhito Ichii, Masahito Ueyama

    AGRICULTURAL AND FOREST METEOROLOGY   Vol. 201   page: 38 - 50   2015.2

     More details

    Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    We investigated carbon allocation in a cool-temperate forest in central Japan in years of contrasting climate anomalies: an early spring warming induced by the El Nino Southern Oscillation in 2002 and a low summer photosynthetic photon flux density (PPFD) induced by a stationary rain front in 2003. Observations of eddy flux, biometric variables, and chamber measurements from 1999 to 2006 and interannual variations in fine root net primary production (frNPP) were analyzed in conjunction with a terrestrial biosphere model simulation with multiple biometric constraints. Compared to the annual means (excluding 2002 and 2003), the low summer PPFD in 2003 reduced the annual gross primary productivity (GPP; 6%), soil respiration (SR; -11%), and ecosystem respiration (RE; -5%). Under the low summer PPFD, CO2 fluxes commonly decreased but components of the NPP were not affected. The low variation in NPP is explained by previous findings that NPP is more sensitive to climate conditions before or during the early stage of the growing season. The early spring warming in 2002 increased the GPP (8%) and woody tissue NPP (wNPP; 55%) and decreased the frNPP (-33%) and SR (-6%). Although early spring warming prolonged the growing season, the foliage NPP (fNPP) and litterfall were invariant. The increase in wNPP and the decrease in frNPP imply that the forest decreased frNPP in favor of wNPP under the high spring temperature. Although the frNPP was estimated by model-data integration, we argue that the decrease in frNPP is plausible because the decrease in SR cannot be explained without the contribution from fine root respiration. These results suggest that increasing or decreasing patterns of component fluxes cannot necessarily be inferred from the GPP. Factors such as the nature and duration of climate anomalies and allocation shift between components of the NPP may need to be considered when characterizing carbon allocation under anomalous climate events. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.agrformet.2014.11.005

    Web of Science

  18. Recent Changes in Terrestrial Gross Primary Productivity in Asia from 1982 to 2011 Reviewed

    Kazuhito Ichii, Masayuki Kondo, Yuki Okabe, Masahito Ueyama, Hideki Kobayashi, Seung-Jae Lee, Nobuko Saigusa, Zaichun Zhu, Ranga B. Myneni

    REMOTE SENSING   Vol. 5 ( 11 ) page: 6043 - 6062   2013.11

     More details

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

    Past changes in gross primary productivity (GPP) were assessed using historical satellite observations based on the Normalized Difference Vegetation Index (NDVI) from the Advanced Very High Resolution Radiometer (AVHRR) onboard the National Oceanic and Atmospheric Administration (NOAA) satellite series and four terrestrial biosphere models to identify the trends and driving mechanisms related to GPP and NDVI in Asia. A satellite-based time-series data analysis showed that approximately 40% of the area has experienced a significant increase in the NDVI, while only a few areas have experienced a significant decreasing trend over the last 30 years. The increases in the NDVI are dominant in the sub-continental regions of Siberia, East Asia, and India. Simulations using the terrestrial biosphere models also showed significant increases in GPP, similar to the results for the NDVI, in boreal and temperate regions. A modeled sensitivity analysis showed that the increases in GPP are explained by increased temperature and precipitation in Siberia. Precipitation, solar radiation and CO2 fertilization are important factors in the tropical regions. However, the relative contributions of each factor to GPP changes are different among the models.

    DOI: 10.3390/rs5116043

    Web of Science

  19. The role of carbon flux and biometric observations in constraining a terrestrial ecosystem model: a case study in disturbed forests in East Asia

    Kondo Masayuki, Ichii Kazuhito, Ueyama Masahito, Mizoguchi Yasuko, Hirata Ryuichi, Saigusa Nobuko

    ECOLOGICAL RESEARCH   Vol. 28 ( 5 ) page: 893 - 905   2013.9

  20. Site-level model-data synthesis of terrestrial carbon fluxes in the CarboEastAsia eddy-covariance observation network: toward future modeling efforts Reviewed

    Kazuhito Ichii, Masayuki Kondo, Young-Hee Lee, Shao-Qiang Wang, Joon Kim, Masahito Ueyama, Hee-Jeong Lim, Hao Shi, Takashi Suzuki, Akihiko Ito, Hyojung Kwon, Weimin Ju, Mei Huang, Takahiro Sasai, Jun Asanuma, Shijie Han, Takashi Hirano, Ryuichi Hirata, Tomomichi Kato, Sheng-Gong Li, Ying-Nian Li, Takahisa Maeda, Akira Miyata, Yojiro Matsuura, Shohei Murayama, Yuichiro Nakai, Takeshi Ohta, Taku M. Saitoh, Nobuko Saigusa, Kentaro Takagi, Yan-Hong Tang, Hui-Min Wang, Gui-Rui Yu, Yi-Ping Zhang, Feng-Hua Zhao

    JOURNAL OF FOREST RESEARCH   Vol. 18 ( 1 ) page: 13 - 20   2013.2

     More details

    Language:English   Publishing type:Research paper (scientific journal)   Publisher:TAYLOR & FRANCIS LTD  

    Based on the model-data comparison at the eddy-covariance observation sites from CarboEastAsia datasets, we report the current status of the terrestrial carbon cycle modeling in monsoon Asia. In order to assess the modeling performance and discuss future requirements for both modeling and observation efforts in Asia, we ran eight terrestrial biosphere models at 24 sites from 1901 to 2010. By analyzing the modeled carbon fluxes against the CarboEastAsia datasets, the strengths and weaknesses of terrestrial biosphere modeling over Asia were evaluated. In terms of pattern and magnitude, the carbon fluxes (i.e., gross primary productivity, ecosystem respiration, and net ecosystem exchange) at the temperate and boreal forest sites were simulated best, whereas the simulation results from the tropical forest, cropland, and disturbed sites were poor. The multi-model ensemble mean values showed lower root mean square errors and higher correlations, suggesting that composition of multiple terrestrial biosphere models would be preferable for terrestrial carbon budget assessments in Asia. These results indicate that the current model-based estimation of terrestrial carbon budget has large uncertainties, and future research should further refine the models to permit re-evaluation of the terrestrial carbon budget.

    DOI: 10.1007/s10310-012-0367-9

    Web of Science

    CiNii Research

  21. Reproducibility of hydrological process by LSM in semi-arid grassland on seasonal frost

    Miyazaki Shin, Yorozu Kazuaki, Asanuma Jun, Kondo Masayuki, Saito Kazuyuki

    Proceedings of the General Meeting of the Association of Japanese Geographers   Vol. 2013a ( 0 ) page: 100133   2013

     More details

    Publisher:The Association of Japanese Geographers  

    The aim of this study is to investigate the reproducibility of hydrological processes by Land surface model (LSM) in semiarid grassland on seasonal frost. The validation of MATSIRO was carried out over the grassland on seasonal frost sites at Tongyu in China and Kherlen Bayan Ulaan in Mongolia. Two kinds of experiments have been carried out, which LSM was run with the default parameters (CTL) and observed parameters (OBS) for soil physics and hydrology, and vegetation. The OBS run showed better reproducibility than CTL run especially for soil temperature while soil moisture showed poor reproducibility for both.

    DOI: 10.14866/ajg.2013a.0_100133

    CiNii Research

  22. 半乾燥草原における陸面過程モデルによる水文過程の再現性 Invited Reviewed

    宮崎 真, 萬 和明, 浅沼 順, 近藤 雅征

    水文・水資源学会研究発表会要旨集     2012.12

  23. Reproducibility of hydrological process by land surface model in semi-arid grassland

    Miyazaki Shin, Yorozu Kazuaki, Asanuma Jun, Kondo Masayuki

    Proceeding of Annual Conference   Vol. 25 ( 0 ) page: 154   2012

     More details

    Language:Japanese   Publisher:THE JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES  

    The purpose of this study is to investigate the reproducibility of hydrological process by land surface model in semi-arid grassland in Tongyu of China and herlen Bayan Ulaan of Mongolia. The land surface process model (LSM) for this study is MATSIRO (Minimal Advanced Treatments of Surface Interaction and RunOff). The soil temperature was well reproduced both stations while soil moisture was not well reproduced. There were good agreement between the model and observation for the latent heat flux and net radiation while it was poor for sensible heat flux. Further analysis will be necessary to clarify the cause of difference.

    DOI: 10.11520/jshwr.25.0.154.0

    CiNii Research

  24. AsiaFlux Workshop 2010–New Challenges of Fluxnet Community to Resilient Carbon/Water Management-の報告 Invited

    奥村智憲, 安宅未央, 近藤雅征, 望月智貴, 吉村謙一, 見竹康啓

    生物と気象   Vol. 11   page: D1 - D6   2011.3

     More details

    Language:Japanese  

  25. 環境総合推進費の研究(14) 温室効果ガス観測衛星「いぶき」により推定された陸域二酸化炭素吸収量を陸域炭素循環モデル改善に利用する 環境研究総合推進費RF-1007 「GOSAT衛星データを用いた陸域生物圏モデル改善とダウンスケーリング」 Invited

    市井和仁, 近藤雅征, 佐々井崇博, 植山雅仁

    地球環境研究センターニュース     page: 8 - 10   2011.1

▼display all

Books 2

  1. State of science in carbon budget assessments for temperate forests and grasslands International journal

    Masayuki Kondo, Richard Birdsey, Thomas A.M. Pugh, Ronny Lauerwald, Peter A. Raymond, Shuli Niu, Kim Naudts

    Elsevier  2022.5 

     More details

    Responsible for pages:237-270   Language:English Book type:Scholarly book

  2. 地球規模の観測データに基づく森林環境の変化の把握

    近藤 雅征( Role: Joint author ,  将来気候下での世界の森林環境, 第7章)

    共立出版株式会社  2019.12 

MISC 37

  1. Ocean uptake and land use change emissions suppressed atmospheric CO&lt;sub&gt;2&lt;/sub&gt; growth in the 2015/16 El Nino

    KONDO Masayuki, LANDSCHUETZER Peter, IIDA Yousuke, HOUGHTON Richard, SITCH Stephen

    日本地球惑星科学連合大会予稿集(Web)   Vol. 2019   page: ROMBUNNO.ACG32‐06 (WEB ONLY)   2019

     More details

    Language:English  

    J-GLOBAL

  2. Carbon balance shifts controlled by land use change and ENSO in Southeast Asia

    KONDO Masayuki, ICHII Kazuhito, ICHII Kazuhito, PATRA Prabir K, CANADELL Joseph G, POULTER Benjamin, CALLE Leonardo, SITCH Stephen, SAEKI Tazu, SAIGUSA Nobuko

    日本地球惑星科学連合大会予稿集(Web)   Vol. 2018   page: ROMBUNNO.ACG35‐P03 (WEB ONLY)   2018

     More details

    Language:English  

    J-GLOBAL

  3. Terrestrial Energy, Water, and Carbon Flux Estimation Using Machine Learning Algorithms

    ICHII Kazuhito, WATANABE Hiroyuki, TANIGUCHI Hirotomo, UEYAMA Masahito, KONDO Masayuki

    Journal of The Remote Sensing Society of Japan   Vol. 38 ( 2 ) page: 114 - 120   2018

     More details

    Language:Japanese   Publisher:一般社団法人 日本リモートセンシング学会  

    &lt;p&gt;Using the machine learning technique with the wider availability of various observation data, the integration of ground observation data and satellite observation data has been advancing. In recent years, these techniques were applied to studies of terrestrial energy, water, and carbon cycles to estimate their spatial and temporal variations by upscaling. In this article, we provide an overview of the upscaling technique using machine learning and discuss potential applications of the dataset to terrestrial biosphere studies.&lt;/p&gt;

  4. The role of plant regrowth in recent enhancement of terrestrial carbon uptake

    KONDO Masayuki, ICHII Kazuhito, ICHII Kazuhito, PATRA Prabir K, POULTER Benjamin, POULTER Benjamin, CALLE Leonardo

    日本地球惑星科学連合大会予稿集(Web)   Vol. 2018   page: ROMBUNNO.ACG35‐02 (WEB ONLY)   2018

     More details

    Language:English  

    J-GLOBAL

  5. Evaluating Terrestrial Components by Earth System Models and Offline Terrestrial Models Using Observation‐based Products

    ICHII Kazuhito, ICHII Kazuhito, ICHII Kazuhito, TAKAYAMA Hiroaki, HAJIMA Tomohiro, KONDO Masayuki, PATRA Prabir, TACHIIRI Kaoru

    日本地球惑星科学連合大会予稿集(Web)   Vol. 2018   page: ROMBUNNO.ACG35‐03 (WEB ONLY)   2018

     More details

    Language:English  

    J-GLOBAL

  6. エルニーニョ南方振動に対応した近年の陸域CO<sub>2</sub>吸収・排出傾向:地上・衛星観測に基づいた異なるプロダクトの相互比較

    近藤雅征, 高木宏志, 市井和仁, 佐伯田鶴

    日本気象学会大会講演予稿集   ( 112 ) page: 244   2017.9

     More details

    Language:Japanese  

    J-GLOBAL

  7. FLUXCOM remote sensing data based CO&lt;sub&gt;2&lt;/sub&gt; flux products: overview and synthesis

    ICHII Kazuhito, ICHII Kazuhito, JUNG Martin, TRAMONTANA Gianluca, CAMPS‐VALLS Gustau, SCHWALM Christopher R, KONDO Masayuki, PAPALE Dario, REICHSTEIN Markus, WEBER Ulrich, YANAGI Yuji

    日本地球惑星科学連合大会予稿集(Web)   Vol. 2017   page: ROMBUNNO.AAS04‐17 (WEB ONLY)   2017

     More details

    Language:English  

    J-GLOBAL

  8. データ駆動型モデルで推定された陸域CO<sub>2</sub>収支の変動把握

    市井和仁, 市井和仁, 植山雅仁, 近藤雅征, 柳裕二, 三枝信子

    日本気象学会大会講演予稿集   ( 110 ) page: 227   2016.9

     More details

    Language:Japanese  

    J-GLOBAL

  9. Sources and Sinks of Carbon Dioxide in Populous Asia

    PATRA Prabir K, CANADELL Josep G, THOMPSON Rona L, KONDO Masayuki, POULTER Benjamin

    APN Science Bulletin   ( 6 ) page: 4‐7   2016.4

     More details

    Language:English  

    J-GLOBAL

  10. Current state of terrestrial CO&lt;sub&gt;2&lt;/sub&gt; exchange estimations: progresses and remaining issues

    KONDO Masayuki, ICHII Kazuhito, PATRA Prabir, SAEKI Tazu

    日本地球惑星科学連合大会予稿集(Web)   Vol. 2016   page: ROMBUNNO.ACG09‐08 (WEB ONLY)   2016

     More details

    Language:English  

    J-GLOBAL

  11. Synthesis of top‐down and bottom‐up estimations of terrestrial CO&lt;sub&gt;2&lt;/sub&gt; budget in Asia

    ICHII Kazuhito, ICHII Kazuhito, KONDO Masayuki, PATRA Prabir, SAEKI Tazu, MAKI Takashi, NAKAMURA Takashi, NIWA Yosuke, UEYAMA Masahito, HAYASHI Masato, BORJIGIN Habura, YANAGI Yuji, SAIGUSA Nobuko

    日本地球惑星科学連合大会予稿集(Web)   Vol. 2016   page: ROMBUNNO.AAS01‐P11 (WEB ONLY)   2016

     More details

    Language:English  

    J-GLOBAL

  12. Data‐driven synthesis on terrestrial CO&lt;sub&gt;2&lt;/sub&gt; budget changes in Asia

    ICHII Kazuhito, ICHII Kazuhito, PATRA Prabir, UEYAMA Masahito, KONDO Masayuki, SAIGUSA Nobuko

    日本地球惑星科学連合大会予稿集(Web)   Vol. 2016   page: ROMBUNNO.AAS01‐11 (WEB ONLY)   2016

     More details

    Language:English  

    J-GLOBAL

  13. Current status of data‐driven estimation of terrestrial carbon and energy fluxes using eddy‐covariance network and remote sensing data

    ICHII Kazuhito, ICHII Kazuhito, KONDO Masayuki, UEYAMA Masahito

    日本地球惑星科学連合大会予稿集(Web)   Vol. 2016   page: ROMBUNNO.ACG22‐14 (WEB ONLY)   2016

     More details

    Language:English  

    J-GLOBAL

  14. RECENT CHANGES IN TERRESTRIAL CO2 FLUXES IN SIBERIA INFERRED FROM MULTIPLE BOTTOM‐UP ESTIMATIONS

    ICHII Kazuhito, UEYAMA Masahito, KONDO Masayuki, ITO Akihiko, KATO Tomomichi, SATO Hisashi, SASAI Takahiro, KOBAYASHI Hideki, YANAGI Yuji, SAIGUSA Nobuko

    Abstract. International Symposium on the Arctic Research (Web)   Vol. 4th   page: A06‐O15 (WEB ONLY)   2015

     More details

    Language:English  

    J-GLOBAL

  15. GOSAT L4Aプロダクトと種々のボトムアップ手法の陸域炭素フラックスの比較

    近藤雅征, 市井和仁, 植山雅仁

    日本気象学会大会講演予稿集   ( 106 ) page: 163   2014.9

     More details

    Language:Japanese  

    J-GLOBAL

  16. 陸域炭素循環モデルと衛星観測データの融合実験

    市井和仁, 近藤雅征

    国立環境研究所スーパーコンピュータ利用研究年報 平成25年度     page: 39 - 44   2014

     More details

    Language:Japanese  

    J-GLOBAL

  17. C168 GOSAT L4Aプロダクトと種々のボトムアップ手法の陸域炭素フラックスの比較(温室効果ガス観測技術衛星GOSAT「いぶき」の研究成果と今後,スペシャル・セッション)

    市井 和仁, 近藤 雅征, 植山 雅仁

    大会講演予講集   Vol. 106   2014

     More details

    Language:Japanese   Publisher:日本気象学会  

  18. 季節凍土上の半乾燥草原における陸面過程モデルによる水文過程の再現性

    宮崎真, 萬和明, 浅沼順, 近藤雅征, 斉藤和之

    日本地理学会発表要旨集   Vol. 2013 ( 84 ) page: 112   2013.9

     More details

    Language:Japanese   Publisher:公益社団法人 日本地理学会  

    The aim of this study is to investigate the reproducibility of hydrological processes by Land surface model (LSM) in semiarid grassland on seasonal frost. The validation of MATSIRO was carried out over the grassland on seasonal frost sites at Tongyu in China and Kherlen Bayan Ulaan in Mongolia. Two kinds of experiments have been carried out, which LSM was run with the default parameters (CTL) and observed parameters (OBS) for soil physics and hydrology, and vegetation. The OBS run showed better reproducibility than CTL run especially for soil temperature while soil moisture showed poor reproducibility for both.

    J-GLOBAL

  19. The role of carbon flux and biometric observations in constraining a terrestrial ecosystem model: a case study in disturbed forests in East Asia

    Masayuki Kondo, Kazuhito Ichii, Masahito Ueyama, Yasuko Mizoguchi, Ryuichi Hirata, Nobuko Saigusa

    ECOLOGICAL RESEARCH   Vol. 28 ( 5 ) page: 893 - 905   2013.9

     More details

    Language:English   Publisher:SPRINGER JAPAN KK  

    The process of confining unnecessary freedom is a step toward advanced ecosystem modeling. This study demonstrates the importance of carbon flux and biometric observation in constraining a terrestrial ecosystem model with a simple optimization scheme. At the selected sites from AsiaFlux network, a simultaneous optimization scheme for both carbon flux and biomass was compared with carbon flux-oriented and biomass-oriented optimization schemes using the Biome-BGC model. The optimization scheme oriented to either carbon flux or biomass provided simulation results that were consistent with observations, but with reduced performance in unconstrained variables. The simultaneous optimization scheme yielded results that were consistent with observations for both carbon flux and biomass. By comparing long-term projections simulated by three schemes, it was found that the optimization oriented only to carbon flux has limited performance because misrepresented biomass significantly affected a projection of carbon exchange through heterotrophic respiration. From these experiments, we found that (1) a process model like Biome-BGC is capable of reproducing both carbon flux and biomass within acceptable proximity, (2) constraining biomass is importance not just because it is one of carbon cycle components, but also it significantly affects simulations of carbon flux. Thus, it is important to invest more effort to improve simulation of biomass as well as carbon flux.

    DOI: 10.1007/s11284-013-1072-7

    Web of Science

    J-GLOBAL

  20. 環境研究総合推進費の研究紹介(14)温室効果ガス観測技術衛星「いぶき」により推定された陸域二酸化炭素吸収量を陸域炭素循環モデル改善に利用する 環境研究総合推進費RF‐1007「GOSAT衛星データを用いた陸域生物圏モデルの改善とダウンスケーリング」

    市井和仁, 近藤雅征, 佐々井崇博, 植山雅仁

    地球環境研究センターニュース(Web)   Vol. 24 ( 1 ) page: 8-10 (WEB ONLY)   2013.4

     More details

    Language:Japanese  

    J-GLOBAL

  21. 福島第一原発事故後の福島県における植生の変化

    関澤諒, 市井和仁, 近藤雅征

    生研フォーラム 広域の環境・災害リスク情報の収集と利用フォーラム論文集   Vol. 22nd   page: 45 - 48   2013.2

     More details

    Language:Japanese  

    J-GLOBAL

  22. SATELLITE‐BASED VEGETATION CHANGES IN FUKUSHIMA PREFECTURE AFTER FUKUSHIMA DAIICHI NUCLEAR DISASTER

    SEKIZAWA Ryo, ICHII Kazuhito, KONDO Masayuki

    日本リモートセンシング学会学術講演会論文集   Vol. 54th   page: 95 - 98   2013

     More details

    Language:English  

    J-GLOBAL

  23. GOSATL4Aプロダクトを利用した全球生態系呼吸量の算出

    近藤雅征, 市井和仁

    日本気象学会大会講演予稿集   ( 102 ) page: 363   2012.9

     More details

    Language:Japanese  

    J-GLOBAL

  24. 半乾燥草原における水文過程の陸面過程モデルと観測値の比較検証

    宮崎真, 萬和明, 浅沼順, 近藤雅征

    日本地理学会発表要旨集   Vol. 2012 ( 82 ) page: 155   2012.9

     More details

    Language:Japanese   Publisher:公益社団法人 日本地理学会  

    To investigate the reproducibility of hydrological process by land surface process model MATSIRO in semi-arid grassland in China and Mongolia. The soil temperature (Ts) was well reproduced by model. Although the freezing phase had good agreement between observation and model, the simulated Ts started earlier thawing than the observation. The soil moisture was not well reproduced by the model. In winter time the reproducibility of soil moisture become worst when soil was frozen. There was good agreement between the model and observation for the latent heat flux and net radiation while it was poor for sensible heat flux.

    J-GLOBAL

  25. 2000年~2010年におけるアジアの異常気象と陸域炭素循環の関係

    畠山早也夏, 近藤雅征, 市井和仁

    日本気象学会大会講演予稿集   ( 101 ) page: 253   2012.4

     More details

    Language:Japanese  

    J-GLOBAL

  26. GOSAT衛星プロダクトを用いた陸域炭素循環モデルの改善に向けて

    近藤雅征, 市井和仁

    日本気象学会大会講演予稿集   ( 101 ) page: 460   2012.4

     More details

    Language:Japanese  

    J-GLOBAL

  27. A358 GOSATL4Aプロダクトを利用した全球生態系呼吸量の算出(物質循環,口頭発表)

    近藤 雅征, 市井 和仁

    大会講演予講集   Vol. 102   2012

     More details

    Language:Japanese   Publisher:日本気象学会  

  28. Reproducibility of hydrological process by land surface model in semi-arid grassland

    Miyazaki Shin, Yorozu Kazuaki, Asanuma Jun, Kondo Masayuki

    Proceeding of Annual Conference   Vol. 25 ( 0 )   2012

     More details

    Language:Japanese   Publisher:水文・水資源学会  

    The purpose of this study is to investigate the reproducibility of hydrological process by land surface model in semi-arid grassland in Tongyu of China and herlen Bayan Ulaan of Mongolia. The land surface process model (LSM) for this study is MATSIRO (Minimal Advanced Treatments of Surface Interaction and RunOff). The soil temperature was well reproduced both stations while soil moisture was not well reproduced. There were good agreement between the model and observation for the latent heat flux and net radiation while it was poor for sensible heat flux. Further analysis will be necessary to clarify the cause of difference.

  29. P227 2000年~2010年におけるアジアの異常気象と陸域炭素循環の関係(ポスター・セッション)

    畠山 早也夏, 近藤 雅征, 市井 和仁

    大会講演予講集   Vol. 101   2012

     More details

    Language:Japanese   Publisher:日本気象学会  

  30. C411 GOSAT衛星プロダクトを用いた陸域炭素循環モデルの改善に向けて(観測手法,一般口頭発表)

    近藤 雅征, 市井 和仁

    大会講演予講集   Vol. 101   2012

     More details

    Language:Japanese   Publisher:日本気象学会  

  31. 大気逆解析モデルによる陸域CO<sub>2</sub>収支推定を利用した陸域炭素循環モデル改善への試み

    市井和仁, 近藤雅征, 佐々井崇博, 植山雅仁

    日本気象学会大会講演予稿集   ( 100 ) page: 191   2011.10

     More details

    Language:Japanese  

    J-GLOBAL

  32. GOSAT L4Aプロダクトを利用した陸域炭素循環モデルの改善

    市井和仁, 近藤雅征, 佐々井崇博, 植山雅仁

    日本リモートセンシング学会学術講演会論文集   Vol. 50th   page: 241 - 242   2011.5

     More details

    Language:Japanese  

    J-GLOBAL

  33. B371 大気逆解析モデルによる陸域CO_2収支推定を利用した陸域炭素循環モデル改善への試み(スペシャル・セッション「大気中の二酸化炭素観測手法の新たな展開とそのデータ利用」,一般口頭発表)

    市井 和仁, 近藤 雅征, 佐々井 崇博, 植山 雅仁

    大会講演予講集   Vol. 100   2011

     More details

    Language:Japanese   Publisher:日本気象学会  

  34. Establishment of the Acceptable Parameter Range of Chlorophyll Photointeractions for Terrestrial Ecosystem Model

    KONDO Masayuki, ICHII Kazuhito

    日本気象学会大会講演予稿集   ( 98 ) page: 337   2010.9

     More details

    Language:English  

    J-GLOBAL

  35. アジア域における陸域生態系モデル相互比較:初期解析結果

    市井和仁, 近藤雅征, 鈴木孝, 高橋一穂, 高橋純一, 伊藤昭彦, 佐々井崇博, 植山雅仁, 平田竜一, 三枝信子

    日本気象学会大会講演予稿集   ( 98 ) page: 502   2010.9

     More details

    Language:Japanese  

    J-GLOBAL

  36. P366 アジア域における陸域生態系モデル相互比較 : 初期解析結果(ポスター・セッション)

    市井 和仁, 近藤 雅征, 鈴木 孝, 高橋 一穂, 高橋 純一, 伊藤 昭彦, 佐々井 崇博, 植山 雅仁, 平田 竜一, 三枝 信子

    大会講演予講集   Vol. 98   2010

     More details

    Language:Japanese   Publisher:日本気象学会  

  37. D368 Establishment of the Acceptable Parameter Range of Chlorophyll Photointeractions for Terrestrial Ecosystem Model :

    kondo Masayuki, Ichii Kazuhito

    大会講演予講集   Vol. 98   2010

     More details

    Language:English   Publisher:日本気象学会  

▼display all

Presentations 3

  1. Global and regional CO2 budget comparison between top-down and bottom-up approaches Invited International conference

    Masayuki Kondo

    American Geophysical Union Fall (AGU) Meeting 2018  2018.12 

     More details

    Language:English   Presentation type:Oral presentation (keynote)  

  2. the role of CO2 release and uptake induced by land use changes in recent terrestrial carbon balance Invited International conference

    Masayuki Kondo

    Asia Oceania Geosciences Society (AOGS) 16th Annual Meeting  2019.7 

     More details

    Language:English   Presentation type:Oral presentation (keynote)  

  3. The effect of land use changes on current terrestrial carbon cycle Invited International conference

    Masayuki Kondo

    the 3rd international Conference of Climate Change 2019  2019.2 

     More details

    Language:English   Presentation type:Oral presentation (keynote)  

Other research activities 36

  1. メディア報道

    2019.12

     More details

    環境情報メディア 環境展望台「千葉大など、「陸域CO2収支量」推定手法間のばらつきを解消」

  2. メディア報道

    2019.12

     More details

    電気新聞「千葉大などがCO2収支を精度よく推定する手法を整理」

  3. メディア報道

    2019.12

     More details

    化学工業日報「千葉大などがCO2収支を精度良く推定する手法を整理」

  4. メディア報道

    2019.12

     More details

    大学ジャーナルONLINE「CO2の放出と吸収、より正確に推定 千葉大など新手法」

  5. メディア報道

    2019.12

     More details

    Bioengineer.org「Estimates of ecosystem carbon mitigation improved towards the goal of the Paris agreement」

  6. メディア報道

    2019.12

     More details

    ScienceDaily「Estimates of ecosystem carbon mitigation improved towards the goal of the Paris agreement」

  7. メディア報道

    2019.12

     More details

    Environmental News Network「Estimates of ecosystem carbon mitigation improved towards the goal of the Paris agreement」

  8. メディア報道

    2019.12

     More details

    Live Science Tech「Estimates of ecosystem carbon mitigation improved towards the goal of the Paris agreement」

  9. メディア報道

    2019.12

     More details

    Terra Daily (Australia)「Estimates of ecosystem carbon mitigation improved towards the goal of the Paris agreement」

  10. メディア報道

    2019.12

     More details

    Eurasia Review「Estimates of ecosystem carbon mitigation improved towards the goal of the Paris agreement」

  11. メディア報道

    2019.12

     More details

    Industry Global News24「Advancement in estimation of carbon removal by terrestrial ecosystems」

  12. メディア報道

    2019.12

     More details

    One News Page「Estimates of ecosystem carbon mitigation improved towards the goal of the Paris agreement」

  13. メディア報道

    2019.12

     More details

    Long Room.com「Estimates of ecosystem carbon mitigation improved towards the goal of the Paris agreement」

  14. メディア報道

    2019.12

     More details

    SCIENMAG「Estimates of ecosystem carbon mitigation improved towards the goal of the Paris agreement」

  15. プレスリリース

    2019.12

     More details

    CO2の放出と吸収のより正確な推定に成功~IPCC第5次評価報告書からの進展と第6次評価報告書に向けた課題~:Kondo et al., 2019 Global Change Biologyに基づく発表(記者レク発表代表:近藤雅征)、2019年12月12日、環境省記者クラブにて報道発表(千葉大学、海洋研究開発機構、国立環境研究所、気象研究所の共同発表)

  16. メディア報道

    2019.12

     More details

    Physics.org「Estimates of ecosystem carbon mitigation improved towards the goal of the Paris agreement」

  17. メディア報道

    2019.12

     More details

    Agenparl「Estimates of ecosystem carbon mitigation improved towards the goal of the Paris agreement」

  18. メディア報道

    2019.12

     More details

    Pharma Jobs「Estimates of ecosystem carbon mitigation improved towards the goal of the Paris agreement」

  19. メディア報道

    2019.12

     More details

    Science Codec「Estimates of ecosystem carbon mitigation improved towards the goal of the Paris agreement」

  20. メディア報道

    2018.5

     More details

    Climate Wire「EMISSIONS Abandoned farms are absorbing CO2」

  21. メディア報道

    2018.5

     More details

    環境情報メディア 環境展望台「千葉大、2000年代における陸域CO2吸収量の変化要因を解明」

  22. メディア報道

    2018.5

     More details

    日刊工業新聞「CO2吸収増加続く 60年代以降森林管理が奏功」

  23. メディア報道

    2018.5

     More details

    日本経済新聞「陸上のCO2吸収最大に」

  24. プレスリリース

    2018.5

     More details

    2000年代の陸域CO2吸収量が過去100年間で最大!過去の大規模土地利用変化から回復した植生が原因の一つ~陸域生態系による大気CO2増加の緩和プロセスに新たな理解~:Kondo et al., 2018 Geophysical Research Lettersに基づく発表(記者レク発表代表:近藤雅征)、2018年5月16日、千葉大学工学部松陰会館にて報道発表(千葉大学、海洋研究開発機構の共同発表

  25. メディア報道

    2018.4

     More details

    中日新聞「地球温暖化を裏で操る」

  26. メディア報道

    2018.4

     More details

    東京新聞「地球温暖化を裏で操る」

  27. メディア報道

    2018.3

     More details

    時事通信、時事ドットコムニュース「強いエルニーニョで増加懸念=東南アジアCO2排出量」

  28. メディア報道

    2018.3

     More details

    日本経済新聞「弱いエルニーニョ現象 東南アCO2排出抑制」

  29. メディア報道

    2018.3

     More details

    日刊工業新聞「森林伐採によるCO2排出 気候変動で相殺」

  30. メディア報道

    2018.3

     More details

    NHK NEWS WEB「気候の自然変動がCO2排出抑制 千葉大など調査」

  31. メディア報道

    2018.3

     More details

    環境情報メディア 環境展望台「千葉大など、東南アジアの森林伐採等に由来するCO2排出とエルニーニョ現象の因果関係を解明」

  32. メディア報道

    2018.3

     More details

    つくばサイエンスニュース「周期的自然変動がCO2排出に影響―森林伐採による増加抑制も」

  33. プレスリリース

    2018.3

     More details

    気候の自然変動が大規模森林伐採による二酸化炭素の排出を相殺した現象を世界で初めて検出!~東南アジアの生態系によるCO2排出量が2000年代に減少した原因を解明、地球温暖化現象の理解に向けて新たな足掛かり~:Kondo et al., 2018 Nature Communicationsに基づく発表(記者レク発表代表:近藤雅征)、2018年3月20日、文部科学者会にて報道発表(千葉大学、海洋研究開発機構、国立環境研究所、気象研究所の共同発表)

  34. メディア報道

    2015.7

     More details

    化学工業日報「陸域CO2吸収量、衛星・地上データから算出 中高緯度で整合性」

  35. メディア報道

    2015.7

     More details

    日刊工業新聞「北半球での中高域のCO2 高確率で排出量推定」

  36. プレスリリース

    2015.7

     More details

    地上・衛星観測データが示す大気中二酸化炭素の行方~異なる2つの最新手法を相互的に評価~:Kondo et al., 2015 Journal of Geophysical Research-Biogeoscienceに基づく発表(記者レク発表代表:近藤雅征)、2015年7月16日、文部科学記者会にて報道発表(海洋研究開発機構、国立環境研究所の共同発表)

▼display all

KAKENHI (Grants-in-Aid for Scientific Research) 3

  1. グローバルスケールにおける林齢マップの作成に向けた手法の開発

    2019.4 - 2021.3

    科学研究費助成事業-基盤研究C(一般) 

    近藤 雅征

      More details

    Authorship:Principal investigator  Grant type:Competitive

  2. 機械学習を用いたアマゾン熱帯林におけるCO2吸収・排出傾向の理解に向けた研究

    2018.4 - 2019.3

    千葉大学学内研究推進事業 平成30年度研究費獲得促進プログラム 

    近藤 雅征

      More details

    Authorship:Principal investigator  Grant type:Competitive

  3. モデル―データ相互比較実験を通したアジア域の陸域炭素収支推定の不確実性低減

    Grant number:25281003   2015.4 - 2016.3

    科学研究費助成事業-基盤研究B(一般) 

    市井 和仁

      More details

    Grant type:Competitive