Last modified: 24 August 2017
YOKOI, Satoru, Ph. D.
English/Japanese

Senior Scientist
Department of Coupled Ocean-Atmosphere-Land Processes Research
Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
2-15, Natsushima-cho, Yokosuka 237-0061, Japan
e-mail:


1. Research interest
  • Tropical meteorology
    • Tropical intraseasonal variability, Madden-Julian Oscillation (MJO), and diurnal cycle
    • Tropical cyclones
    • Asian monsoon
2. Education
  • Mar. 2006: Ph. D., Graduate School of Science, Kyoto University, Kyoto, Japan
  • Mar. 2003: MSc in Science, Graduate School of Science, Kyoto University, Kyoto, Japan
  • Mar. 2001: BSc in Science, Faculty of Science, Kyoto University, Kyoto, Japan
3. Professional experiences
  • Apr. 2014 - Present: Senior Scientist, Japan Agency for Marine-Earth Science and Technology
  • Apr. 2014 - Apr. 2015: Visiting Research Scientist, Lamont-Doherty Earth Observatory, Columbia University in the City of New York
  • Apr. 2012 - Mar. 2014: Scientist, Japan Agency for Marine-Earth Science and Technology
  • Apr. 2010 - Mar. 2012: Project Research Associate, Atmosphere and Ocean Research Institute, University of Tokyo
  • Feb. 2010 - Mar. 2010: Project Research Associate, Center for Climate System Research, University of Tokyo
  • Oct. 2007 - Feb. 2010: Postdoctoral Researcher, Center for Climate System Research, University of Tokyo
  • Apr. 2006 - Sep. 2007: Postdoctoral Researcher, Graduate School of Science, University of Tokyo
  • Jun. 2005 - Jan. 2006: Research Assistant, Graduate School of Science, Kyoto University
  • Jun. 2004 - Mar. 2005: Research Assistant, Graduate School of Science, Kyoto University
  • Oct. 2003 - Feb. 2004: Research Assistant, Graduate School of Science, Kyoto University
4. Referred publications
  • Note: Articles #6, #7, #9, #11, and #12 are cited in Climate Change 2013: The Physical Science Basis.
  1. Yokoi, S., S. Mori, M. Katsumata, B. Geng, K. Yasunaga, F. Syamsudin, Nurhayati, and K. Yoneyama, 2017:
    Diurnal cycle of precipitation observed in the western coastal area of Sumatra Island: Offshore preconditioning by gravity waves.
    Monthly Weather Review, 145, 3745-3761, doi:10.1175/MWR-D-16-0468.1 [full text]

  2. Wu, P., D. Ardiansyah, S. Yokoi, S. Mori, F. Syamsudin, and K. Yoneyama, 2017:
    Why torrential rain occurs on the western coast of Sumatra Island at the leading edge of the MJO westerly wind bursts.
    SOLA, 13, 36-40.

  3. Yokoi, S., and A. H. Sobel, 2015:
    Intraseasonal variability and seasonal march of the moist static energy budget over the eastern Maritime Continent during CINDY2011/DYNAMO.
    Journal of the Meteorological Society of Japan, 93A, 81-100, doi:10.2151/jmsj.2015-041 [abstract]

  4. Yokoi, S., 2015:
    Multireanalysis comparison of variability in column water vapor and its analysis increment associated with Madden-Julian oscillation.
    Journal of Climate, 28, 793-808. [abstract]

  5. Yokoi, S., M. Katsumata, and K. Yoneyama, 2014:
    Variability in surface meteorology and air-sea fluxes due to cumulus convective systems observed during CINDY/DYNAMO.
    Journal of Geophysical Research: Atmospheres, 119, 2064-2078, doi:10.1002/2013JD020621. [abstract]

  6. Mori, M., M. Kimoto, M. Ishii, S. Yokoi, T. Mochizuki, Y. Chikamoto, M. Watanabe, T. Nozawa, H. Tatebe, T. T. Sakamoto, Y. Komuro, Y. Imada, and H. Koyama, 2013:
    Hindcast prediction and near-future projection of tropical cyclone activity over the Western North Pacific using CMIP5 near-term experiments with MIROC.
    Journal of the Meteorological Society of Japan, 91, 431-452. [abstract].

  7. Miyakawa, T., S. Yokoi, N. Hirota, S. Hirahara, T. Inoue, and Y. N. Takayabu, 2013:
    A summer Eastern Asian metric for CMIP3 climate models: an iterative selection method.
    Journal of Meteorological Society of Japan, 91, 305-321. [abstract]

  8. Yokoi, S., Y. N. Takayabu, and H. Murakami, 2013:
    Attribution of projected future changes in tropical cyclone passage frequency over the Western North Pacific.
    Journal of Climate, 26, 4096-4011. [abstract]

  9. Yokoi, S., and Y. N. Takayabu, 2013:
    Attribution of decadal variability in tropical cyclone passage frequency over the Western North Pacific: A new approach emphasizing the genesis place of cyclones.
    Journal of Climate, 26, 973-987. [abstract]

  10. Yokoi, S., C. Takahashi, K. Yasunaga, and R. Shirooka, 2012:
    Multi-model projection of tropical cyclone genesis frequency over the Western North Pacific: CMIP5 results.
    SOLA, 8, 137-140. [abstract]

  11. Nishii, K., T. Miyasaka, H. Nakamura, Y. Kosaka, S. Yokoi, Y. N. Takayabu, H. Endo, H. Ichikawa, T. Inoue, K. Oshima, N. Sato, and Y. Tsushima, 2012:
    Relationship of the reproducibility of multiple variables among global climate models.
    Journal of the Meteorological Society of Japan, 90A, 87-100.

  12. Yokoi, S., Y. Nakayama, Y. Agata, T. Satomura, K. Kuraji, and J. Matsumoto, 2012:
    The relationship between observation interval and errors in radar rainfall estimation over the Indochina Peninsula.
    Hydrological Processes, 26, 834-842. [abstract]

  13. Yokoi, S., Y. N. Takayabu, K. Nishii, H. Nakamura, H. Endo, H. Ichikawa, T. Inoue, M. Kimoto, Y. Kosaka, T. Miyasaka, K. Oshima, N. Sato, Y. Tsushima, and M. Watanabe, 2011:
    Application of cluster analysis to climate model performance metrics.
    Journal of Applied Meteorology and Climatology, 50, 1666-1675. [abstract]

  14. Yokoi, S., and Y. N. Takayabu, 2010:
    Environmental and external factors in the genesis of tropical cyclone Nargis in April 2008 over the Bay of Bengal.
    Journal of the Meteorological Society of Japan, 88, 425-435. [abstract]

  15. Yokoi, S., and Y. N. Takayabu, 2009:
    Multi-model projection of global warming impact on tropical cyclone genesis frequency over the western North Pacific.
    Journal of the Meteorological Society of Japan, 87, 525-538. [abstract]

  16. Yokoi, S., Y. N. Takayabu, and J. C. L. Chan, 2009:
    Tropical cyclone genesis frequency over the western North Pacific simulated in medium-resolution coupled general circulation models.
    Climate Dynamics, 33, 665-683, doi:10.1007/s00382-009-0593-9. [abstract]

  17. Yokoi, S., and T. Satomura, 2008:
    Geographical distribution of variance of intraseasonal variations in western Indochina as revealed from radar reflectivity data.
    Journal of Climate, 21, 5154-5161. [abstract]

  18. Yokoi, S., and J. Matsumoto, 2008:
    Collaborative effects of cold surge and tropical depression-type disturbance on heavy rainfall in central Vietnam.
    Monthly Weather Review, 136, 3275-3287. [abstract]

  19. Yokoi, S., T. Satomura, and J. Matsumoto, 2007:
    Climatological Characteristics of the Intraseasonal Variation of Precipitation over the Indochina Peninsula.
    Journal of Climate, 20, 5301-5315. [abstract]

  20. Yokoi, S., and T. Satomura, 2006:
    Mechanisms of the Northward Movement of Submonthly-scale Vortices over the Bay of Bengal during the Boreal Summer.
    Monthly Weather Review, 134, 2251-2265. [abstract]

  21. Yokoi, S., and T. Satomura, 2005:
    An observational study of intraseasonal variations over southeast Asia during the 1998 rainy season.
    Monthly Weather Review, 133, 2091-2104. [abstract]
5. International presentations
  • Yokoi, S., S. Mori, M. Katsumata, B. Geng, K. Yasunaga, F. Syamsudin, Nurhayati, and K. Yoneyama, 2017: Diurnal offshore migration of precipitation area over western coastal waters of Sumatra Island observed during Pre-YMC field campaign: Offshore preconditioning due to gravity waves. AOGS 2017, oral, Singapore.
  • Yokoi, S., S. Mori, M. Katsumata, B. Geng, K. Yasunaga, F. Syamsudin, Nurhayati, and K. Yoneyama, 2017: Observational study of diurnal offshore migration of precipitation area over the Indonesian Maritime Continent. JpGU-AGU Joint Meeting 2017, oral, Chiba.
  • Yokoi, S., S. Mori, M. Katsumata, B. Geng, K. Yasunaga, F. Syamsudin, Nurhayati, and K. Yoneyama, 2017: Diurnal cycle of precipitation observed in the western coastal area of Sumatra Island, Indonesia: Offshore preconditioning by gravity waves. EGU General Assembly 2017, oral, Vienna.

  • Yokoi, S., S. Mori, M. Katsumata, K. Yasunaga, and K. Yoneyama, 2016: Diurnal cycle and its modulation by Madden-Julian oscillation observed around western coast of Sumatra Island: Preconditioning for offshore convection by gravity waves. 2016 AGU Fall Meeting, oral, San Francisco.
  • Yokoi, S., 2016: Diurnal cycle of precipitation in western coastal area of Sumatra Island observed during Pre-YMC field campaign. Workshop on global precipitation systems, oral, Yokohama.
  • Yokoi, S., 2016: Pre-YMC (and YMC) field campaigns in western coastal area of Sumatra Island: Diurnal cycle and its modulation by MJO. Mini workshop on the Madden-Julian oscillation, oral, Kashiwa.
  • Yokoi, S., S. Mori, M. Katsumata, and K. Yoneyama, 2016: Modulation of diurnal cycle by Madden-Julian Oscillation during Pre-YMC2015 field campaign. Workshop on intraseasonal processes and prediction in the Maritime Continent, oral, Singapore.
  • Yokoi, S., 2016: Studies on moist static energy variability associated with Madden-Julian Oscillation over the Maritime Continent. Seminar at U. Washington, Seattle.

  • Yokoi, S., 2015: Variability in moist static energy budget associated with the Madden-Julian Oscillation over the eastern Maritime Continent during CINDY2011/DYNAMO extended observing period. 2015 AGU Fall Meeting, oral, San Francisco.
  • Yokoi, S., and A. H. Sobel, 2015: Seasonal march and intraseasonal variability of the moist static energy budget over the eastern Maritime Continent during CINDY2011/DYNAMO. AOGS 2015, oral, Singapore.
  • Yokoi, S., 2015: Multi-reanalysis comparison of variability in analysis increment of column water vapor associated with Madden-Julian Oscillation. AOGS 2015, oral, Singapore.
  • Yokoi, S., and A. H. Sobel, 2015: Intraseasonal variability of the moist static energy budget over the eastern Maritime Continent during CINDY2011/DYNAMO field campaign. 26th IUGG General Assembly, oral, Prague.

  • Yokoi, S., 2014: Multi-reanalysis comparison of variability in analysis increment of column water vapor associated with Madden-Julian Oscillation. 2014 AGU Fall Meeting, poster, San Francisco.
  • Yokoi, S., 2014: Water vapor tendency associated with MJO represented in global reanalysis products. AMS 31st Conference on Hurricanes and Tropical Meteorology, oral, San Diego.
  • Yokoi, S., Y. N. Takayabu, and H. Murakami, 2014: Attribution of projected future changes in tropical cyclone passage frequency over the Western North Pacific. The 2nd International Workshop on CMIP5 Model Intercomparisons for Future Projections of Precipitation and Climate in Asia, poster, Tokyo.

  • Yokoi, S., 2013: Precipitable water vapor budget associated with MJO represented in newly-released JRA-55 reanalysis data. 2013 AGU Fall Meeting, poster, San Francisco.
  • Yokoi, S., Y. N. Takayabu, and H. Murakami, 2013: Attribution of projected future changes in tropical cyclone passage frequency over the Western North Pacific. International Workshop on CMIP5 Model Intercomparisons for Future Projections of Precipitation and Climate in Asia, poster, Tsukuba.
  • Yokoi, S., A. Seiki, and T. Horii, 2013: Variability of surface meteorology and air-sea fluxes observed by R/V Mirai during CINDY2011/DYNAMO campaign. MJO Field Data and Science Workshop, poster, Hawaii.

  • Yokoi, S., A. Seiki, and T. Horii, 2012: Variability in surface meteorological variables over the equatorial Indian Ocean and its relationship with the Madden-Julian Oscillation. 2012 AGU Fall Meeting, poster, San Francisco.
  • Yokoi, S., Y. N. Takayabu, and H. Murakami, 2012: Attribution of Multi-Model Future Projection of Tropical Cyclone Passage Frequency and over the Western North Pacific Basin. AOGS-AGU (WPGM) Joinst Assembly, oral, Singapore.
  • Yokoi, S., 2012: Diversity in the Behavior of Tropical Intraseasonal Convective Anomalies during Boreal Winter. AOGS-AGU (WPGM) Joinst Assembly, poster, Singapore.
  • Yokoi, S., 2012: Intraseasonal variability in tropical Asian monsoon regions. Japan Geoscience Union Meeting 2012, oral (invited), Chiba.
  • Yokoi, S., Y. N. Takayabu, and H. Murakami, 2012: Attribution of multi-model based future projection of tropical cyclone passage frequency over the Western North Pacific. The 14th international specialist meeting on the next generation models of climate change and sustainability for advanced high performance computing facilities - Climate 2012 -, poster, Maui.

  • Yokoi, S., and Y. N. Takayabu, 2011: Attribution of Decadal Variability in Tropical Cyclone Occurrence Frequency. IUGG 2011, oral, Melbourne.

  • Yokoi, S., and Y. N. Takayabu, 2010: Attribution of long-term variability in tropical cyclone occurrence frequency over the western North Pacific. Western Pacific Geophysics Meetinc, poster, Taipei.

  • Yokoi, S., Y. N. Takayabu, and J. C. L. Chan, 2009: Tropical cyclogenesis frequency simulated by CMIP3 climate models and multi-model based future projection. International Workshop on Advancement of Typhoon Track Forecast Technique., oral, Tokyo.
  • Yokoi, S., Y. N. Takayabu, and J. C. L. Chan, 2009: Multi-model based projection of tropical cyclone genesis frequency over the western North Pacific basin using CMIP3 archive. Fourth Japan-China-Korea Joint Conference on Meteorology, oral, Tsukuba.
  • Yokoi, S., 2009: Torrential rainfall in Myanmar and associated atmospheric disturbances. 2009 Joint International Symposium IGU-Commission on Hazard and Risk and Japan Geographical Union, oral, Okinawa.
  • Yokoi, S., and Y. N. Takayabu, 2009: Climate Model Intercomparison and Multi-model Based Future Projection on Tropical Cyclogenesis Distribution over the Western North Pacific. MOCA-09, the IAMAS-IAPSO-IACS 2009 Joint Assembly, oral, Montreal.
  • Yokoi, S., and Y. N. Takayabu, 2009: Multi-model projection of global warming impact on tropical cyclone genesis frequency over the western North Pacific. The University Allied Workshop on Climate and Environmental Changes, oral, Seoul.
  • Yokoi, S., and Y. N. Takayabu, 2009: Multi-model Projection of Tropical Cyclogenesis over the Western North Pacific using CMIP3 Archive. International Workshop on Global Change Projection: Modeling, Intercomparison, and Impact Assessment jointly with 2nd International Workshop on KAKUSHIN Program, oral, Yokohama.

  • Yokoi, S., and Y. N. Takayabu, 2008: Multi–model comparison of global warming impacts on tropical cyclone genesis frequency over the western North Pacific. 2008 AGU Fall Meeting, poster, San Francisco.
  • Yokoi, S., Y. N. Takayabu, and J. C. L. Chan, 2008: Seasonal march of tropical cyclogenesis simulated in eight climate models from WCRP CMIP3 multimodel dataset. JSPS 5th University Allied Workshop on Climate and Environmental Studies for Global Sustainability, Chiba.
  • Yokoi, S., Y. N. Takayabu, and J. C. L. Chan, 2008: Seasonal march of tropical cyclogenesis simulated in eight climate models from WCRP CMIP3 multimodel dataset. European Geosciences Union General Assembly, poster, Vienna, Austria.
  • Yokoi, S., and J. Matsumoto, 2008: Collaborative Effect of a Cold Surge and Tropical Intraseasonal Variation on a Heavy Rainfall in Central Vietnam. Third WCRP International Conference on Reanalysis, poster, Tokyo, Japan.

  • Yokoi, S., and J. Matsumoto, 2007: Heavy rainfalls in central Vietnam and cold surges from China. The 6th International Symposium on Asian Monsoon, oral, Fukuoka, Japan.
  • Yokoi, S., and J. Matsumoto, 2007: A heavy rainfall event in central Vietnam and collaboration effect of a cold surge and tropical intraseasonal variability. Third China-Korea-Japan Joint Conference on Meteorology, oral, Beijing, China.
  • Yokoi, S., and J. Matsumoto, 2007: Cold surge in developing phase of northeasterly Asian monsoon and their relationship with heavy rainfall in central Vietnam. AOGS 4th annual meeting, oral, Bangkok, Thailand.
  • Yokoi, S., T. Satomura, and J. Matsumoto, 2007: Regionality in characteristics of intraseasonal variations over the Indochina Peninsula.IUGG, oral, Perugia, Italy.

  • Yokoi, S., T. Satomura, and J. Matsumoto, 2006: Study on the Intraseasonal Variations of Precipitation over the Indochina Peninsula. The 3rd Asia Pacific Association of Hydrology and Water Resources (APHW) Conference, oral, Bangkok, Thailand.
  • Yokoi, S., T. Satomura, and J. Matsumoto, 2006: Intraseasonal Variations in Precipitation over the Indochina Peninsula. Vietnam-Japan Joint Workshop on Asian Monsoon, oral, Ha Long, Vietnam.

  • Yokoi, S. and T. Satomura, 2005: Mechanisms of northward movement of sub-monthly-scale disturbances over the Bay of Bengal. AOGS 2nd annual meeting 2005, oral, Singapore.

  • Yokoi, S. and T. Satomura, 2004: Mechanisms of westward and northward movement of sub-monthly scale disturbances over Asian monsoon regions. The 6th International Study Conference on GEWEX in Asia and GAME, poster, Kyoto, Japan.
  • Yokoi, S. and T. Satomura, 2004: Effects of mean flow on movement of intra-seasonal disturbances in the Asian monsoon region during the boreal summer. The 2nd KAGI21 International Symposium, oral, Beppu, Japan.
  • Yokoi, S. and T. Satomura, 2004: Westward propagating mechanisms of sub-monthly scale disturbances during summer Asian monsoon season. International Asian Monsoon Symposium (IAMS), p145, oral, Honolulu, U.S.A.

  • Yokoi, S. and T. Satomura, 2003: Submonthly-scale variation in the tropical Asian monsoon region. KAGI21 International Kick-off Symposium, poster, Kyoto, Japan.
  • Yokoi, S. and T. Satomura, 2003: Some characteristics of submonthly-timescale disturbances in different latitudes over the Bay of Bengal. The International Symposium on the Climate System of Asian Monsoon and Its Interaction with Society (CSAMIS), oral, Khon Khen, Thailand.
  • Yokoi, S. and T. Satomura, 2003: The 10-20-day Variation over the Southeast Asia in 1998 Rainy Season. IUGG, oral, Sapporo, Japan.
6. Funding information
  • "Future projection on extreme precipitation intensity using global cloud-system resolving model", Grand-in-Aid for Scientific Research (C-16K05560) of MEXT, FY2016-2019, PI: Satoru Yokoi
  • "Study on transformation processes of MJO over the Maritime Continent using YMC observation data and climate models", Grant-in-Aid for Scientific Research (B-16H04048) of MEXT, FY2016-2020, PI: Prof. Hiroaki Miura
  • "Climatology of variability in surface meteorology due to precipitation systems in the tropics", Grant-in-Aid for Young Scientists (B-25800268) of MEXT, FY2013-2015, PI: Satoru Yokoi
  • "Study on MJO initiation processes using CINDY2011 observation data and state-of-the-art climate models", Grant-in-Aid for Scientific Research (B-2587119) of MEXT, FY2013-2015, PI: Prof. Hiroaki Miura
  • "Studies on future climate projection of the Asian region utilizing the CMIP5 multi-model ensemble data", Environmental Research and Technology Development Fund, FY2012-2014, PI: Prof. Yukari Takayabu
  • "Long-lived typhoons in tropical landmasses", Grant-in-Aid for Scientific Research (B-21310120) of MEXT, FY2009-2011, PI: Prof. Takehiko Satomura
  • "Intraseasonal variability over the Asian monsoon regions and its impact on diurnal cycle", Grant-in-Aid for Young Scientists (B-19740284) of MEXT, FY2007-2009, PI: Satoru Yokoi
7. Professional services
  • Professional societies
    • Meteorological Society of Japan
    • Japan Geoscience Union (JpGU)
    • American Meteorological Society (AMS)
    • Amerian Geophysical Union (AGU)
  • Review experiences
    • Advances in Atmospheric Sciences
    • Asia-Pacific Journal of Atmospheric Sciences
    • Atmosphere-Ocean
    • Atmospheric Science Letters
    • Climate Dynamics
    • Geophysical Research Letters
    • Hydrological Research Letters
    • International Journal of Climatology
    • Journal of Applied Meteorology and Climatology
    • Journal of Climate
    • Journal of Geophysical Research: Atmospheres
    • Journal of Geophysical Research: Oceans
    • Journal of the Atmospheric Sciences
    • Journal of the Meteorological Society of Japan
    • Meteorology and Atmospheric Physics
    • Scientific Online Letters on the Atmosphere
    • Scientific Reports
    • Theoretical and Applied Climatology