Updated on 2026/02/02

写真a

 
NOZAWA Toru
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Professor
Position
Professor
External link

Degree

  • Doctor of Science ( 1997.1   Kyoto University )

Research Interests

  • global warming

  • 気候変化

  • climate change

  • 地球温暖化

Research Areas

  • Natural Science / Atmospheric and hydrospheric sciences

  • Environmental Science/Agriculture Science / Environmental dynamic analysis

Education

  • Kyoto University   大学院理学研究科   地球物理学専攻博士課程

    1993.4 - 1996.7

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  • Kyoto University   大学院理学研究科   地球物理学専攻修士課程

    1991.4 - 1993.3

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    Country: Japan

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  • Kyoto University   理学部  

    1987.4 - 1991.3

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    Country: Japan

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Research History

  • Okayama University   学術研究院環境生命自然科学学域   Professor

    2023.4

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  • Okayama University   学術研究院自然科学学域   Professor

    2021.4 - 2023.4

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  • Okayama University   The Graduate School of Natural Science and Technology   Professor

    2013.4 - 2021.3

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  • National Institute for Environmental Studies   地球環境研究センター   Head

    2011.4 - 2013.3

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  • National Institute for Environmental Studies   大気圏環境研究領域   Head

    2006.4 - 2011.3

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  • National Institute for Environmental Studies   大気圏環境研究領域   Chief Researcher

    2002.4 - 2006.3

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  • National Institute for Environmental Studies   大気圏環境部   Researcher

    1998.1 - 2002.3

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  • Kyoto University   Disaster Prevention Research Institute

    1996.8 - 1997.12

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  • Japan Society for the Promotion of Science

    1993.4 - 1996.3

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Professional Memberships

 

Papers

  • Global Historical Reanalysis with a 60-km AGCM and Surface Pressure Observations: OCADA Reviewed

    Masayoshi ISHII, Hirotaka KAMAHORI, Hisayuki KUBOTA, Masumi ZAIKI, Ryo MIZUTA, Hiroaki KAWASE, Masaya NOSAKA, Hiromasa YOSHIMURA, Naga OSHIMA, Eiki SHINDO, Hiroshi KOYAMA, Masato MORI, Shoji HIRAHARA, Yukiko IMADA, Kohei YOSHIDA, Toru NOZAWA, Tetsuya TAKEMI, Takashi MAKI, Akio NISHIMURA

    Journal of the Meteorological Society of Japan. Ser. II   102 ( 2 )   209 - 240   2024.3

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

    DOI: 10.2151/jmsj.2024-010

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  • The Importance of Ocean Dynamical Feedback for Understanding the Impact of Mid-High-Latitude Warming on Tropical Precipitation Change Reviewed

    Masakazu Yoshimori, Ayako Abe-Ouchi, Hiroaki Tatebe, Toru Nozawa, Akira Oka

    JOURNAL OF CLIMATE   31 ( 6 )   2417 - 2434   2018.3

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

    DOI: 10.1175/JCLI-D-17-0402.1

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  • Effect of retreating sea ice on Arctic cloud cover in simulated recent global warming Reviewed

    Manabu Abe, Toru Nozawa, Tomoo Ogura, Kumiko Takata

    ATMOSPHERIC CHEMISTRY AND PHYSICS   16 ( 22 )   14343 - 14356   2016.11

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

    DOI: 10.5194/acp-16-14343-2016

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  • Asymmetric impact of the physiological effect of carbon dioxide on hydrological responses to instantaneous negative and positive CO2 forcing Reviewed

    Manabu Abe, Hideo Shiogama, Tokuta Yokohata, Seita Emori, Toru Nozawa

    CLIMATE DYNAMICS   45 ( 7-8 )   2181 - 2192   2015.10

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    DOI: 10.1007/s00382-014-2465-1

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  • Temperature scaling pattern dependence on representative concentration pathway emission scenarios A Letter (vol 112, pg 535, 2012) Reviewed

    Yasuhiro Ishizaki, Hideo Shiogama, Seita Emori, Tokuta Yokohata, Toru Nozawa, Tomoo Ogura, Manabu Abe, Masakazu Yoshimori, Kiyoshi Takahashi

    CLIMATIC CHANGE   125 ( 2 )   277 - 277   2014.7

  • Validation of a Pattern Scaling Approach for Determining the Maximum Available Renewable Freshwater Resource Reviewed

    Yasuhiro Ishizaki, Tokuta Yokohata, Seita Emori, Hideo Shiogama, Kiyoshi Takahashi, Naota Hanasaki, Toru Nozawa, Tomoo Ogura, Toshiyuki Nakaegawa, Masakazu Yoshimori, Ai Yoshida, Shigeru Watanabe

    JOURNAL OF HYDROMETEOROLOGY   15 ( 1 )   505 - 516   2014.2

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

    DOI: 10.1175/JHM-D-12-0114.1

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  • Dependence of Precipitation Scaling Patterns on Emission Scenarios for Representative Concentration Pathways Reviewed

    Yasuhiro Ishizaki, Hideo Shiogama, Seita Emori, Tokuta Yokohata, Toru Nozawa, Kiyoshi Takahashi, Tomoo Ogura, Masakazu Yoshimori, Tatsuya Nagashima

    JOURNAL OF CLIMATE   26 ( 22 )   8868 - 8879   2013.11

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    DOI: 10.1175/JCLI-D-12-00540.1

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  • On the linear additivity of climate forcing-response relationships at global and continental scales Reviewed

    Hideo Shiogama, Daithi A. Stone, Tatsuya Nagashima, Toru Nozawa, Seita Emori

    INTERNATIONAL JOURNAL OF CLIMATOLOGY   33 ( 11 )   2542 - 2550   2013.9

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    DOI: 10.1002/joc.3607

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  • Hindcast Prediction and Near-Future Projection of Tropical Cyclone Activity over the Western North Pacific Using CMIP5 Near-Term Experiments with MIROC Reviewed

    Masato Mori, Masahide Kimoto, Masayoshi Ishii, Satoru Yokoi, Takashi Mochizuki, Yoshimitsu Chikamoto, Masahiro Watanabe, Toru Nozawa, Hiroaki Tatebe, Takashi T. Sakamoto, Yoshiki Komuro, Yukiko Imada, Hiroshi Koyama

    JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN   91 ( 4 )   431 - 452   2013.8

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

    DOI: 10.2151/jmsj.2013-402

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  • An overview of decadal climate predictability in a multi-model ensemble by climate model MIROC Reviewed

    Yoshimitsu Chikamoto, Masahide Kimoto, Masayoshi Ishii, Takashi Mochizuki, Takashi T. Sakamoto, Hiroaki Tatebe, Yoshiki Komuro, Masahiro Watanabe, Toru Nozawa, Hideo Shiogama, Masato Mori, Sayaka Yasunaka, Yukiko Imada

    CLIMATE DYNAMICS   40 ( 5-6 )   1201 - 1222   2013.3

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

    DOI: 10.1007/s00382-012-1351-y

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  • Regional impacts of sulfur and carbonaceous aerosols on precipitation scaling patterns in representative concentration pathways Reviewed

    Yasuhiro Ishizaki, Hideo Shiogama, Seita Emori, Tokuta Yokohata, Toru Nozawa, Kiyoshi Takahashi, Tomoo Ogura, Masakazu Yoshimori, Tatsuya Nagashima

    J Climate   2013

  • Perturbed physics ensemble using the MIROC5 coupled atmosphere-ocean GCM without flux corrections: experimental design and results Parametric uncertainty of climate sensitivity Reviewed

    Hideo Shiogama, Masahiro Watanabe, Masakazu Yoshimori, Tokuta Yokohata, Tomoo Ogura, James D. Annan, Julia C. Hargreaves, Manabu Abe, Youichi Kamae, Ryouta O'ishi, Rei Nobui, Seita Emori, Toru Nozawa, Ayako Abe-Ouchi, Masahide Kimoto

    CLIMATE DYNAMICS   39 ( 12 )   3041 - 3056   2012.12

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

    DOI: 10.1007/s00382-012-1441-x

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  • The contribution of anthropogenic forcings to regional changes in temperature during the last decade Reviewed

    Nikolaos Christidis, Peter A. Stott, Francis W. Zwiers, Hideo Shiogama, Toru Nozawa

    CLIMATE DYNAMICS   39 ( 6 )   1259 - 1274   2012.9

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

    DOI: 10.1007/s00382-011-1184-0

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  • MIROC4h-A New High-Resolution Atmosphere-Ocean Coupled General Circulation Model Reviewed

    Takashi T. Sakamoto, Yoshiki Komuro, Teruyuki Nishimura, Masayoshi Ishii, Hiroaki Tatebe, Hideo Shiogama, Akira Hasegawa, Takahiro Toyoda, Masato Mori, Tatsuo Suzuki, Yukiko Imada, Toru Nozawa, Kumiko Takata, Takashi Mochizuki, Koji Ogochi, Seita Emori, Hiroyasu Hasumi, Masahide Kimoto

    JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN   90 ( 3 )   325 - 359   2012.6

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    DOI: 10.2151/jmsj.2012-301

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  • Temperature scaling pattern dependence on representative concentration pathway emission scenarios Reviewed

    Yasuhiro Ishizaki, Hideo Shiogama, Seita Emori, Tokuta Yokohata, Toru Nozawa, Tomoo Ogura, Manabu Abe, Masakazu Yoshimori, Kiyoshi Takahashi

    CLIMATIC CHANGE   112 ( 2 )   535 - 546   2012.5

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    DOI: 10.1007/s10584-012-0430-8

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  • Predictability of a Stepwise Shift in Pacific Climate during the Late 1990s in Hindcast Experiments Using MIROC Reviewed

    Yoshimitsu Chikamoto, Masahide Kimoto, Masayoshi Ishii, Masahiro Watanabe, Toru Nozawa, Takashi Mochizuki, Hiroaki Tatebe, Takashi T. Sakamoto, Yoshiki Komuro, Hideo Shiogama, Masato Mori, Sayaka Yasunaka, Yukiko Imada, Hiroshi Koyama, Masato Nozu, Fei-fei Jin

    JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN   90A   1 - 21   2012.2

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

    DOI: 10.2151/jmsj.2012-A01

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  • Sea-Ice in Twentieth-Century Simulations by New MIROC Coupled Models: A Comparison between Models with High Resolution and with Ice Thickness Distribution Reviewed

    Yoshiki Komuro, Tatsuo Suzuki, Takashi T. Sakamoto, Hiroyasu Hasumi, Masayoshi Ishii, Masahiro Watanabe, Toru Nozawa, Tokuta Yokohata, Teruyuki Nishimura, Koji Ogochi, Seita Emori, Masahide Kimoto

    JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN   90A   213 - 232   2012.2

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

    DOI: 10.2151/jmsj.2012-A11

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  • Human activity and anomalously warm seasons in Europe Reviewed

    Nikolaos Christidis, Peter A. Stott, Gareth S. Jones, Hideo Shiogama, Toru Nozawa, Juerg Luterbacher

    INTERNATIONAL JOURNAL OF CLIMATOLOGY   32 ( 2 )   225 - 239   2012.2

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

    DOI: 10.1002/joc.2262

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  • Dependencies of precipitation scaling pattern on RCPs emission scenarios

    ishizaki yasuhiro, Shiogama Hideo, emori seita, yokohata tokuta, Nozawa Toru, Takahashi kiyoshi, ogura tomoo, Yoshimori Masakazu

    Proceeding of Annual Conference   25   94 - 94   2012

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

    Pattern scaling approach is a useful approach to investigate the impacts of global warming under a very wide range of emission scenarios We investigated the regional impacts of  aerosols emissions on precipitation in Representative Concentration Pathways to validate the pattern scaling approach. The emissions of anthropogenic aerosols per 1 K global mean SAT differ between emission scenarios in RCPs over the East Asia, the east parts of North America and the region around the Gulf of Guinea. Consequently, evaporation is significantly different between esmission scenarios. The differences in evaporation result in the differences in precipitation over these regions.

    DOI: 10.11520/jshwr.25.0.94.0

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  • Verification of the Performance of the Pseudo-Global-Warming Method for Future Climate Changes during June in East Asia Reviewed

    Takao Yoshikane, Fujio Kimura, Hiroaki Kawase, Toru Nozawa

    SOLA   8   2012

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    DOI: 10.2151/sola.2012-033

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  • An emission pathway for stabilization at 6 Wm(-2) radiative forcing Reviewed

    Toshihiko Masui, Kenichi Matsumoto, Yasuaki Hijioka, Tsuguki Kinoshita, Toru Nozawa, Sawako Ishiwatari, Etsushi Kato, P. R. Shukla, Yoshiki Yamagata, Mikiko Kainuma

    CLIMATIC CHANGE   109 ( 1-2 )   59 - 76   2011.11

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    DOI: 10.1007/s10584-011-0150-5

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  • Estimation of future surface temperature changes constrained using the future‐present correlated modes in inter‐model variability of CMIP3 multimodel simulations Reviewed

    Manabu Abe, Hideo Shiogama, Toru Nozawa, Seita Emori

    Journal of Geophysical Research   116 ( D18 )   D18104   2011.9

  • Impact of carbonaceous aerosols on precipitation in tropical Africa during the austral summer in the twentieth century Reviewed

    Hiroaki Kawase, Toshihiko Takemura, Toru Nozawa

    JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   116   2011.9

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

    DOI: 10.1029/2011JD015933

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  • Estimation of future surface temperature changes constrained using the future-present correlated modes in inter-model variability of CMIP3 multimodel simulations Reviewed

    Manabu Abe, Hideo Shiogama, Toru Nozawa, Seita Emori

    JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   116   2011.9

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

    DOI: 10.1029/2010JD015111

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  • Future projections of surface UV-B in a changing climate Reviewed

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

    JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES   116 ( D16118 )   2011.8

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    DOI: 10.1029/2011JD015749

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

    Hiroaki Kawase, Tatsuya Nagashima, Kengo Sudo, Toru Nozawa

    GEOPHYSICAL RESEARCH LETTERS   38   2011.3

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

    DOI: 10.1029/2010GL046402

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  • Observational constraints indicate risk of drying in the Amazon basin Reviewed

    Hideo Shiogama, Seita Emori, Naota Hanasaki, Manabu Abe, Yuji Masutomi, Kiyoshi Takahashi, Toru Nozawa

    NATURE COMMUNICATIONS   2   253   2011.3

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

    DOI: 10.1038/ncomms1252

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  • Anthropogenic greenhouse gas contribution to flood risk in England and Wales in autumn 2000 Reviewed

    Pardeep Pall, Tolu Aina, Daithi A. Stone, Peter A. Stott, Toru Nozawa, Arno G. J. Hilberts, Dag Lohmann, Myles R. Allen

    NATURE   470 ( 7334 )   382 - 385   2011.2

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

    DOI: 10.1038/nature09762

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  • Impact of the Assimilation of Sea Ice Concentration Data on an Atmosphere-Ocean-Sea Ice Coupled Simulation of the Arctic Ocean Climate Reviewed

    Takahiro Toyoda, Toshiyuki Awaji, Nozomi Sugiura, Shuhei Masuda, Hiromichi Igarashi, Yuji Sasaki, Yoshihisa Hiyoshi, Yoichi Ishikawa, Takashi Mochizuki, Takashi T. Sakamoto, Hiroaki Tatebe, Yoshiki Komuro, Tatsuo Suzuki, Teruyuki Nishimura, Masato Mori, Yoshimitsu Chikamoto, Sayaka Yasunaka, Yukiko Imada, Miki Arai, Masahiro Watanabe, Hideo Shiogama, Toru Nozawa, Akira Hasegawa, Masayoshi Ishii, Masahide Kimoto

    SOLA   7   37 - 40   2011

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

    DOI: 10.2151/sola.2011-010

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  • MIROC-ESM 2010: Model description and basic results of CMIP5-20c3m experiments Reviewed

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

    Geoscientific Model Development   4 ( 4 )   845 - 872   2011

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

    DOI: 10.5194/gmd-4-845-2011

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  • Impact of carbonaceous aerosols on precipitation in tropical Africa during the austral summer in the 20th Century Reviewed

    Kawase, H, T. Takemura, T. Nozawa

    Journal of Geophysical Research   116 ( D18 )   D18116   2011

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

    DOI: 10.1029/2011JD015933

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  • Improved Climate Simulation by MIROC5. Mean States, Variability, and Climate Sensitivity Reviewed

    Masahiro Watanabe, Tatsuo Suzuki, Ryouta O'ishi, Yoshiki Komuro, Shingo Watanabe, Seita Emori, Toshihiko Takemura, Minoru Chikira, Tomoo Ogura, Miho Sekiguchi, Kumiko Takata, Dai Yamazaki, Tokuta Yokohata, Toru Nozawa, Hiroyasu Hasumi, Hiroaki Tatebe, Masahide Kimoto

    JOURNAL OF CLIMATE   23 ( 23 )   6312 - 6335   2010.12

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    DOI: 10.1175/2010JCLI3679.1

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  • Physical mechanism of long-term drying trend over tropical North Africa (vol 37, L21706, 2010) Reviewed

    Hiroaki Kawase, Manabu Abe, Yukiko Yamada, Toshihiko Takemura, Tokuta Yokohata, Toru Nozawa

    GEOPHYSICAL RESEARCH LETTERS   37   2010.11

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  • Probabilistic estimates of recent changes in temperature: a multi-scale attribution analysis Reviewed

    Nikolaos Christidis, Peter A. Stott, Francis W. Zwiers, Hideo Shiogama, Toru Nozawa

    CLIMATE DYNAMICS   34 ( 7-8 )   1139 - 1156   2010.6

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    DOI: 10.1007/s00382-009-0615-7

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  • Emission Scenario Dependency of Precipitation on Global Warming in the MIROC3.2 Model Reviewed

    Hideo Shiogama, Seita Emori, Kiyoshi Takahashi, Tatsuya Nagashima, Tomoo Ogura, Toru Nozawa, Toshihiko Takemura

    JOURNAL OF CLIMATE   23 ( 9 )   2404 - 2417   2010.5

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

    DOI: 10.1175/2009JCLI3428.1

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  • Physical mechanism of long-term drying trend over tropical North Africa Reviewed

    Hiroaki Kawase, Manabu Abe, Yukiko Yamada, Toshihiko Takemura, Tokuta Yokohata, Toru Nozawa

    GEOPHYSICAL RESEARCH LETTERS   37   2010.5

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

    DOI: 10.1029/2010GL043038

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  • Emission scenario dependencies in climate change assessments of the hydrological cycle Reviewed

    Hideo Shiogama, Naota Hanasaki, Yuji Masutomi, Tatsuya Nagashima, Tomoo Ogura, Kiyoshi Takahashi, Yasuaki Hijioka, Toshihiko Takemura, Toru Nozawa, Seita Emori

    CLIMATIC CHANGE   99 ( 1-2 )   321 - 329   2010.3

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

    DOI: 10.1007/s10584-009-9765-1

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  • Pacific decadal oscillation hindcasts relevant to near-term climate prediction Reviewed

    Takashi Mochizuki, Masayoshi Ishii, Masahide Kimoto, Yoshimitsu Chikamoto, Masahiro Watanabe, Toru Nozawa, Takashi T. Sakamoto, Hideo Shiogama, Toshiyuki Awaji, Nozomi Sugiura, Takahiro Toyoda, Sayaka Yasunaka, Hiroaki Tatebe, Masato Mori

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA   107 ( 5 )   1833 - 1837   2010.2

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

    DOI: 10.1073/pnas.0906531107

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  • Possible Influence of Volcanic Activity on the Decadal Potential Predictability of the Natural Variability in Near-Term Climate Predictions Reviewed

    Hideo Shiogama, Seita Emori, Takashi Mochizuki, Sayaka Yasunaka, Tokuta Yokohata, Masayoshi Ishii, Toru Nozawa, Masahide Kimoto

    ADVANCES IN METEOROLOGY   2010   2010

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

    DOI: 10.1155/2010/657318

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  • Correlation between Inter-Model Similarities in Spatial Pattern for Present and Projected Future Mean Climate Reviewed

    Manabu Abe, Hideo Shiogama, Julia C. Hargreaves, James D. Annan, Toru Nozawa, Seita Emori

    SOLA   5   133 - 136   2009

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    DOI: 10.2151/sola.2009-034

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  • Visualization of huge climate data with high-speed spherical self-organizing map

    Kanta Tachibana, Norihiko Sugimoto, Hideo Shiogama, Toru Nozawa

    Journal of Advanced Computational Intelligence and Intelligent Informatics   13 ( 3 )   210 - 216   2009

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    Language:English   Publishing type:Research paper (international conference proceedings)  

    DOI: 10.20965/jaciii.2009.p0210

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  • Attribution of Declining Western US Snowpack to Human Effects Reviewed

    David W. Pierce, Tim P. Barnett, Hugo G. Hidalgo, Tapash Das, Celine Bonfils, Benjamin D. Santer, Govindasamy Bala, Michael D. Dettinger, Daniel R. Cayan, Art Mirin, Andrew W. Wood, Toru Nozawa

    JOURNAL OF CLIMATE   21 ( 23 )   6425 - 6444   2008.12

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

    DOI: 10.1175/2008JCLI2405.1

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  • Detection and Attribution of Temperature Changes in the Mountainous Western United States Reviewed

    Celine Bonfils, Benjamin D. Santer, David W. Pierce, Hugo G. Hidalgo, Govindasamy Bala, Tapash Das, Tim P. Barnett, Daniel R. Cayan, Charles Doutriaux, Andrew W. Wood, Art Mirin, Toru Nozawa

    JOURNAL OF CLIMATE   21 ( 23 )   6404 - 6424   2008.12

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

    DOI: 10.1175/2008JCLI2397.1

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  • Impacts of Global Warming on Hydrological Cycles in the Asian Monsoon Region Reviewed

    Koji Dairaku, Seita Emori, Toru Nozawa

    ADVANCES IN ATMOSPHERIC SCIENCES   25 ( 6 )   960 - 973   2008.11

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

    DOI: 10.1007/s00376-008-0960-1

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  • Attribution of polar warming to human influence Reviewed

    Nathan P. Gillett, Daithi A. Stone, Peter A. Stott, Toru Nozawa, Alexey Yu. Karpechko, Gabriele C. Hegerl, Michael F. Wehner, Philip D. Jones

    NATURE GEOSCIENCE   1 ( 11 )   750 - 754   2008.11

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

    DOI: 10.1038/ngeo338

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  • Comparison of equilibrium and transient responses to CO2 increase in eight state-of-the-art climate models Reviewed

    Tokuta Yokohata, Seita Emori, Toru Nozawa, Tomoo Ogura, Michio Kawamiya, Yoko Tsushima, Tatsuo Suzuki, Seiji Yukimoto, Ayako Abe-Ouchi, Hiroyasu Hasumi, Akimasa Sumi, Masahide Kimoto

    TELLUS SERIES A-DYNAMIC METEOROLOGY AND OCEANOGRAPHY   60 ( 5 )   946 - 961   2008.10

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

    DOI: 10.1111/j.1600-0870.2008.00345.x

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  • Human-induced changes in the hydrology of the western United States Reviewed

    Tim P. Barnett, David W. Pierce, Hugo G. Hidalgo, Celine Bonfils, Benjamin D. Santer, Tapash Das, Govindasamy Bala, Andrew W. Wood, Toru Nozawa, Arthur A. Mirin, Daniel R. Cayan, Michael D. Dettinger

    SCIENCE   319 ( 5866 )   1080 - 1083   2008.2

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

    DOI: 10.1126/science.1152538

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  • Changes in Mean and Extreme Precipitation in Near-term Predictions up to the Year 2030 Reviewed

    Hideo Shiogama, Akira Hasegawa, Toru Nozawa, Seita Emori

    SOLA   4   17 - 20   2008

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    DOI: 10.2151/sola.2008-005

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  • Detection of human influence on twentieth-century precipitation trends Reviewed

    Xuebin Zhang, Francis W. Zwiers, Gabriele C. Hegerl, F. Hugo Lambert, Nathan P. Gillett, Susan Solomon, Peter A. Stott, Toru Nozawa

    NATURE   448 ( 7152 )   461 - U4   2007.7

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    DOI: 10.1038/nature06025

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  • Robustness of climate change signals in near term predictions up to the year 2030: Changes in the frequency of temperature extremes Reviewed

    Hideo Shiogama, Toru Nozawa, Seita Emori

    GEOPHYSICAL RESEARCH LETTERS   34 ( 12 )   L12714   2007.6

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    DOI: 10.1029/2007GL029318

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  • Different transient climate responses of two versions of an atmosphere-ocean coupled general circulation model Reviewed

    T. Yokohata, S. Emori, T. Nozawa, T. Ogura, N. Okada, T. Suzuki, Y. Tsushima, M. Kawamiya, A. Abe-Ouchi, H. Hasumi, A. Sumi, M. Kimoto

    GEOPHYSICAL RESEARCH LETTERS   34 ( 2 )   2007.1

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    DOI: 10.1029/2006GL027966

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    Other Link: http://orcid.org/0000-0003-1745-5952

  • Time evolutions of various radiative forcings for the past 150 years estimated by a general circulation model Reviewed

    Toshihiko Takemura, Yoko Tsushima, Tokuta Yokohata, Toru Nozawa, Tatsuya Nagashima, Teruyuki Nakajima

    GEOPHYSICAL RESEARCH LETTERS   33 ( 19 )   2006.10

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    DOI: 10.1029/2006GL026666

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  • Influence of volcanic activity and changes in solar irradiance on surface air temperatures in the early twentieth century Reviewed

    H Shiogama, T Nagashima, T Yokohata, SA Crooks, T Nozawa

    GEOPHYSICAL RESEARCH LETTERS   33 ( 9 )   L09702 - L09702   2006.5

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    DOI: 10.1029/2005GL025622

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  • Effect of carbonaceous aerosols on surface temperature in the mid twentieth century Reviewed

    T Nagashima, H Shiogama, T Yokohata, T Takemura, SA Crooks, T Nozawa

    GEOPHYSICAL RESEARCH LETTERS   33 ( 4 )   L04702 - L04702   2006.2

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    DOI: 10.1029/2005GL024887

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  • Detection of Greenhouse Gas and Aerosol Influences on Changes in Temperature Extremes Reviewed

    Hideo Shiogama, Nikolaos Christidis, John Caesar, Tokuta Yokohata, Toru Nozawa, Seita Emori

    SOLA   2   152 - 155   2006

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    DOI: 10.2151/sola.2006-039

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  • Climate response to volcanic forcing: Validation of climate sensitivity of a coupled atmosphere-ocean general circulation model Reviewed

    T Yokohata, S Emori, T Nozawa, Y Tsushima, T Ogura, M Kimoto

    GEOPHYSICAL RESEARCH LETTERS   32 ( 21 )   1 - 4   2005.11

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    DOI: 10.1029/2005GL023542

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  • Anthropogenic and natural forcing impacts on ENSO-like decadal variability during the second half of the 20th century Reviewed

    H Shiogama, M Watanabe, M Kimoto, T Nozawa

    GEOPHYSICAL RESEARCH LETTERS   32 ( 21 )   L21714-L21714-4 - L21714   2005.11

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    DOI: 10.1029/2005GL023871

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  • A simple scheme for climate feedback analysis Reviewed

    T Yokohata, S Emori, T Nozawa, Y Tsushima, T Ogura, M Kimoto

    GEOPHYSICAL RESEARCH LETTERS   32 ( 19 )   1 - 4   2005.10

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    DOI: 10.1029/2005GL023673

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  • Detecting natural influence on surface air temperature change in the early twentieth century Reviewed

    T Nozawa, T Nagashima, H Shiogama, SA Crooks

    GEOPHYSICAL RESEARCH LETTERS   32 ( 20 )   L20719 - L20719   2005.10

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    DOI: 10.1029/2005GL023540

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  • Simulation of climate response to aerosol direct and indirect effects with aerosol transport-radiation model Reviewed

    Toshihiko Takemura, Toru Nozawa, Seita Emori, Takashi Y. Nakajima, Teruyuki Nakajima

    Journal of Geophysical Research D: Atmospheres   110 ( 2 )   1 - 16   2005.1

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    DOI: 10.1029/2004JD005029

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  • HYDROLOGICAL PROJECTION UNDER THE GLOBAL WARMING IN ASIA WITH A REGIONAL CLIMATE MODEL NESTED IN A GENERAL CIRCULATION MODEL

    DAIRAKU Koji, EMORI Seita, NOZAWA Toru

    Doboku Gakkai Ronbunshuu B   49   397 - 402   2005

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    Publisher:Japan Society of Civil Engineers  

    We have developed a new regional climate model based on the Regional Atmospheric Modeling System (RAMS), and conducted present and future Asian regional climate simulations nested in the CCSR/NIES Atmospheric General Circulation Model (AGCM). The general simulated features of the AGCM and some regional phenomena such as orographic precipitation, which were notappeared in the outcome of the AGCM simulation, were successfully produced by the nested regionalclimate model. Annual mean precipitation, evapotranspiration and surface runoff are projected to increase in a lot of Asian regions. Those indicate faster and stronger hydrological cycles. There is growing apprehension that the risk of floods will increase under the global warming and the associated hydrological changes such as the intensification of convective precipitation in summer, the reduction of snow cover in winter, and earlier snow melting in spring.

    DOI: 10.2208/prohe.49.397

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  • Future climate change: Implications for Indian summer monsoon and its variability Reviewed

    M Lal, T Nozawa, S Emori, H Harasawa, K Takahashi, M Kimoto, A Abe-Ouchi, T Nakajima, T Takemura, A Numaguti

    CURRENT SCIENCE   81 ( 9 )   1196 - 1207   2001.11

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  • Simulation of Future Aerosol Distribution, Radiative Forcing, and Long-Range Transport in East Asia : Reviewed

    Takemura Toshihiko, Nakajima Teruyuki, Nozawa Toru, Aoki Kazuma

    Journal of the Meteorological Society of Japan. Ser. II   79 ( 6 )   1139 - 1155   2001

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    Distribution of aerosol concentrations, optical properties, and wet deposition fluxes are simulated for the next fifty years using an aerosol transport model coupled with an atmospheric general circulation model. Treated species are sulfur dioxide, and all the main tropospheric aerosols, i.e., carbonaceous(black and organic carbons), sulfate, soil dust, and sea salt. We especially pay attention to distributions of anthropogenic carbonaceous aerosols, sulfate aerosols, and sulfur dioxide. The simulation uses the Special Report on Emissions Scenarios(SRES)of the Intergovernmental Panel on Climate Change(IPCC)as the future emission scenarios of anthropogenic pollutants. Simulated results suggest that carbonaceous aerosols continue to increase over industrial and densely populated regions for the next five decades, whereas sulfate aerosols decrease around Europe and North America. The aerosol single scattering albedo in the future is, therefore, calculated to become small gradually in the mid-and high-latitudes of the Northern Hemisphere. Sulfate aerosols and sulfur wet deposition fluxes are, on the other hand, simulated to increase only over East Asia. Black carbon and sulfate aerosols around Japan in 2050 are simulated to be two or three times as large as those in 2000 with one of the SRES scenarios. Hence this suggests that pollutants originating from the East Asian continent can seriously affect the atmospheric quality in Japan in the next several decades.

    DOI: 10.2151/jmsj.79.1139

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    Other Link: http://dl.ndl.go.jp/info:ndljp/pid/10611945

  • Coupled ocean-atmosphere model experiments of future climate change with an explicit representation of sulfate aerosol scattering Reviewed

    Seita Emori, Seita Emori, Toru Nozawa, Ayako Abe-Ouchi, Atusi Numaguti, Masahide Kimoto, Teruyuki Nakajima

    Journal of the Meteorological Society of Japan   77 ( 6 )   1299 - 1307   1999.1

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    DOI: 10.2151/jmsj1965.77.6_1299

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  • Spectral anisotropy in forced two-dimensional turbulence on a rotating sphere Reviewed

    Toru Nozawa, Shigeo Yoden

    Physics of Fluids   9 ( 12 )   3834 - 3842   1997.12

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    The datasets on the forced two-dimensional turbulence on a rotating sphere obtained in our recent direct numerical simulations were analyzed to study the spectral anisotropy due to the rotation of the sphere. The results were also compared with those previously obtained in some β-plane experiments to assess the β-plane approximation of the rotating sphere. Owing to the effect of rotation the upward energy cascade ceases around a characteristic total wavenumber nβ at which the linear “β-term” is comparable to the nonlinear Jacobian term. The energy density of zonal components (m=0) is dominant in the range of n≲nβ while the energy is very small in an airfoil-shaped region at the lower edge in the wavenumber space (m,n). Anisotropic distribution of the energy is also found in the high wavenumber region n≳nβ; the energy density decreases as the zonal wavenumber m increases. The flow field in the spherical geometry is projected on some tangential planes from the equator to the poles to compare the spherical results directory with previous β-plane experiments. The energy distribution becomes anisotropic to have dominant zonal components as the local “β-effect” increases (or the tangential plane is put closer to the equator). In the case on equatorial tangential planes, the region in which the energy density is very small shows a dumbbell shape indicating strong anisotropy; this is the first confirmation of the recent finding by Vallis and Maltrud in full spherical geometry.

    DOI: 10.1063/1.869518

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  • Formation of zonal band structure in forced two-dimensional turbulence on a rotating sphere Reviewed

    Toru Nozawa, Shigeo Yoden

    Physics of Fluids   9 ( 7 )   2081 - 2093   1997.7

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    A series of numerical experiments on the forced two-dimensional turbulence on a rotating sphere were done to investigate the formation processes of zonal band structures and their sensitivity to two experimental parameters of the rotation rate and the forcing wave number. A high-resolution barotropic full spherical model of T199 truncation is used with a homogeneous and isotropic formulation of the vorticity forcing function. Three different flow regimes are obtained and one of them is a new regime previously unknown. In the cases of no rotation, a very large flow pattern is obtained as a result of the upward energy cascade to the lowest wave number. The pattern irregularly fluctuates with time. A zonal band structure that consists of alternating easterly and westerly jets becomes dominant with an increase in the rotation rate. The alternating jets, which are robust and persistent, are already formed to be discernible in the very early stage of the time integration. The width of the jets decrease and the number of those increases as the rotation rate increases. The upward cascade of the disturbance energy ceases owing to the effect of rotation around a characteristic wave number nβ at which the “β term” is comparable to the nonlinear Jacobian term. Scale separation between the scale of cascade arrest and the forcing scale allows a systematic alignment of the vortices elongated by the shear in the zonal mean zonal flow, and such an alignment maintains the zonal band structure. When the forcing wave number is small and the rotation rate is large, the band structure is confined in high latitudes yielding a circumpolar vortex with a strong easterly jet, and a wavy structure dominates in middle and low latitudes. This is the new flow regime that is found in this study. Any systematic phase relation is not established in these latitudes because the phases are scrambled by the forcing due to the insufficient scale separation, therefore, the alternating zonal band structure does not emerge.

    DOI: 10.1063/1.869327

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  • 傾斜対流実験のフラクタル次元解析 Reviewed

    野沢 徹, 酒井 敏, 余田成男

    天気   40 ( 11 )   843 - 853   1993.11

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  • 積雪が稀な地域での大雪発生状況の把握と現在及び将来の大雪発生ポテンシャルの評価

    Grant number:19H01377  2019.04 - 2023.03

    日本学術振興会  科学研究費助成事業  基盤研究(B)

    川瀬 宏明, 野沢 徹, 大庭 雅道, 西井 和晃

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    Grant amount:\16770000 ( Direct expense: \12900000 、 Indirect expense:\3870000 )

    本課題は雪の少ない本州の太平洋側などを対象に、退蔵されたままの過去の積雪データを救出し、過去50年間の積雪分布図及び大雪の起こりやすさを指標化した大雪発生ポテンシャルマップを作成することを目的とする、また、数値シミュレーションや機械学習を用いて稀な大雪を引き起こす気象場を明らかにする。
    本年度は昨年度に引き続き、関東から九州にかけての区内観測データのデジタル化を進め、予定していたデジタル化はほぼ終了した。デジタル化した区内観測データを用いて、関東地方、東海地方、及び中国地方における過去の極端な大雪の事例を抽出し、その時に降雪分布及び大気場の影響を調べた。関東地方の大雪はこれまでも指摘されている通り、南岸低気圧によってもたらされたが、大雪の発生するパターンは大きく分けて3つ(南部沿岸部、東部、内陸部)あることが分かった。
    気象庁55年長期再解析データを基に1958年から2020年までを5km格子で計算したデータを区内観測データと比較したところ、積雪・降雪の統計値の再現性が良いことが分かった。また、関東の大雪について長期変化を調べると、降雪量は減少傾向であることが分かった。一方で、降水量は逆に増加トレンドを示していたため、区内観測点が多く分布する低標高地域では、気温上昇による降雪から降雨への変化の影響が大きく降雪量が減少したと考えられる。
    1958年以降の南岸低気圧の大雪を、自己組織化マップを用いて分析したところ、南岸低気圧の頻度は後半年の方が増加し、南岸低気圧にともなう降水量も増加していることが分かった。一方で、南岸低気圧パターンの降雪量は関東、東海、瀬戸内のいずれの地域でも減少した。

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  • Recent surface darkening and abrupt melting of Greenland ice sheet (SIGMA2)

    Grant number:16H01772  2016.04 - 2020.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    Aoki Teruo

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    Grant amount:\41080000 ( Direct expense: \31600000 、 Indirect expense:\9480000 )

    In order to clarify the recent surface melting of the Greenland ice sheet, in-situ field observations, satellite remote sensing and numerical modelling were conducted. In the field observations, existing automatic weather station observations were continued and the data were published. Ice core samples were analyzed to characterize water vapor and mineral dust transport. In satellite remote sensing, we developed an algorithm to retrieve the snow and ice physical parameters using a non-spherical snow particle shape model and quantified the causes of ice sheet surface darkening. In numerical modelling, a regional meteorological model including the detailed processes of light-absorbing aerosols (LAA) was developed. A regional meteorological model including snow metamorphism was used to simulate the time and spatial variation of ice sheet surface melting. In addition, the radiative forcing due to LAA in the atmosphere and snow/ice was estimated by an earth system model.

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  • Numerical modeling studies on the long-term climate variability aimed at detecting anthropogenic signals on the climate change

    Grant number:18310016  2006 - 2008

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    NOZAWA Toru, NAGASHIMA Tatsuya, SHIOGAMA Hideo

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    Grant amount:\18040000 ( Direct expense: \15700000 、 Indirect expense:\2340000 )

    人間活動に伴う気候変化シグナルの検出に資するために、長期内部変動である気候の揺らぎに対して外的な気候変動要因が及ぼす影響について調べた。温室効果ガスの増加など人為的な気候変動要因のみ考慮した場合や、太陽変動など自然的な気候変動要因のみ考慮した場合など、仮想的な数値シミュレーション結果を統計的に比較解析した結果、気候の揺らぎは外的な気候変動要因による著しい変調を受けないと考えられることが示唆された。

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  • 長期気候変動の機構解明

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  • Analysis of long-term climate change

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  • Atmospheric Science Laboratory (2022academic year) 1st semester  - 月5~8

  • Seminar of Atmospheric Science (2022academic year) Year-round  - その他

  • Exercise of Atmosphere Science 1 (2022academic year) Third semester  - 木5~8

  • Exercise of Atmosphere Science 2 (2022academic year) 1st semester  - 月5~8

  • Atmosphere Science 10 (2022academic year) Fourth semester  - 火5~6

  • Atmosphere Science 3 (2022academic year) 1st semester  - 月3~4

  • Atmosphere Science 4 (2022academic year) Second semester  - 月3~4

  • Atmosphere Science 9 (2022academic year) Third semester  - 火5~6

  • Atmosphere Science A (2022academic year) 1st and 2nd semester  - 月3~4

  • Introduction to Earth Science Laboratory (2022academic year) Summer concentration  - その他

  • Climate Change and Variability (2022academic year) Late  - 水3~4

  • Physical Climatology (2022academic year) Prophase  - その他

  • Introduction to Modern Earth Sciences 2 (2022academic year) Second semester  - 水3~4

  • Introduction to Earth and Planetary Atmospheric Sciences (2021academic year) Second semester  - 月5~6

  • Introduction to Earth and Planetary Atmospheric Sciences (2021academic year) Second semester  - 火5~6

  • Advanced Earth System Science (2021academic year) Prophase  - 金7,金8

  • Directed Reading in Earth Science 2 (2021academic year) Fourth semester  - 火3,火4

  • Directed Reading in Earth Science 5 (2021academic year) Third semester  - 木1,木2

  • Directed Reading in Earth Science 1 (2021academic year) 3rd and 4th semester  - 火3,火4

  • Directed Reading in Earth Science 3 (2021academic year) 3rd and 4th semester  - 木1,木2

  • Gateway to Earth Science (2021academic year) 1st semester  - その他

  • Advanced Course in Earth Sciences Ib (2021academic year) Concentration  - その他

  • Basic Sciences of the Earth Training (2021academic year) 1st semester  - その他

  • Basic Science of the Earth 1a (2021academic year) 1st semester  - 金5,金6

  • Basic Science of the Earth A (2021academic year) 1st and 2nd semester  - 金5,金6

  • Atmospheric Physics (2021academic year) 3rd and 4th semester  - 火5,火6

  • Atmospheric Science Laboratory (2021academic year) 1st semester  - 月5,月6,月7,月8

  • Seminar of Atmospheric Science (2021academic year) Year-round  - その他

  • Exercise of Atmosphere Science 1 (2021academic year) Third semester  - 木5,木6,木7,木8

  • Atmosphere Science 10 (2021academic year) Fourth semester  - 火5,火6

  • Atmosphere Science 3 (2021academic year) 1st semester  - 月3,月4

  • Atmosphere Science 4 (2021academic year) Second semester  - 月3,月4

  • Atmosphere Science 9 (2021academic year) Third semester  - 火5,火6

  • Introduction to Earth Science Laboratory (2021academic year) special  - その他

  • Climate Change and Variability (2021academic year) Late  - 水3,水4

  • Physical Climatology (2021academic year) Prophase  - その他

  • Introduction to Modern Earth Sciences 2 (2021academic year) Second semester  - 水3,水4

  • Introduction to Modern Earth Sciences 1 (2021academic year) 1st and 2nd semester  - 水3,水4

  • Introduction to Earth and Planetary Atmospheric Sciences (2020academic year) Second semester  - 月5,月6

  • Introduction to Earth and Planetary Atmospheric Sciences (2020academic year) Second semester  - 火5,火6

  • Advanced Earth System Science (2020academic year) Prophase  - 金7,金8

  • Directed Reading in Earth Science 2 (2020academic year) Fourth semester  - 火3,火4

  • Directed Reading in Earth Science 5 (2020academic year) Third semester  - 木1,木2

  • Directed Reading in Earth Science 1 (2020academic year) 3rd and 4th semester  - 火3,火4

  • Directed Reading in Earth Science 3 (2020academic year) 3rd and 4th semester  - 木1,木2

  • Special Lectures on Earth Science 2 (2020academic year) Summer concentration  - その他

  • Basic Science of the Earth 1a (2020academic year) 1st semester  - 金5,金6

  • Basic Science of the Earth 1a (2020academic year) 1st semester  - 金5,金6

  • Basic Science of the Earth A (2020academic year) 1st and 2nd semester  - 金5,金6

  • Atmospheric Physics (2020academic year) 3rd and 4th semester  - 火5,火6

  • Atmospheric Circulation System (2020academic year) 1st and 2nd semester  - 火1,火2

  • Atmospheric Science Laboratory (2020academic year) Summer concentration  - その他

  • Seminar of Atmospheric Science (2020academic year) Year-round  - その他

  • Exercise of Atmosphere Science 1 (2020academic year) Third semester  - 木5,木6,木7,木8

  • Atmosphere Science 10 (2020academic year) Fourth semester  - 火5,火6

  • Atmosphere Science 3 (2020academic year) 1st semester  - 月3,月4

  • Atmosphere Science 4 (2020academic year) Second semester  - 月3,月4

  • Atmosphere Science 5 (2020academic year) 1st semester  - 火1,火2

  • Atmosphere Science 6 (2020academic year) Second semester  - 火1,火2

  • Atmosphere Science 9 (2020academic year) Third semester  - 火5,火6

  • Introduction to Earth Science Laboratory (2020academic year) special  - その他

  • Climate Change and Variability (2020academic year) Late  - 水3,水4

  • Physical Climatology (2020academic year) Prophase  - その他

  • Introduction to Modern Earth Sciences 2 (2020academic year) Second semester  - 水3,水4

  • Introduction to Modern Earth Sciences 1 (2020academic year) 1st and 2nd semester  - 水3,水4

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