Response of the Asian Summer Monsoon Precipitation to Global Warming in a High-Resolution Global Nonhydrostatic Model

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  • Hiroshi G. Takahashi
    Department of Geography, Tokyo Metropolitan University, Tokyo, Japan
  • Nozomi Kamizawa
    Department of Geography, Tokyo Metropolitan University, Tokyo, Japan
  • Tomoe Nasuno
    Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
  • Youhei Yamada
    Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, and Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
  • Chihiro Kodama and
    Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
  • Shiori Sugimoto
    Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
  • Masaki Satoh
    Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Japan

書誌事項

公開日
2020-09-15
資源種別
journal article
権利情報
  • http://creativecommons.org/licenses/by/4.0/
DOI
  • 10.1175/jcli-d-19-0824.1
公開者
American Meteorological Society

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説明

<jats:title>Abstract</jats:title><jats:p>This study examined the responses of Asian monsoon precipitation to global warming on the regional scale, focusing on monsoon westerlies and monsoon trough. This is because the Asian monsoon precipitation is closely associated with tropical disturbances. To reproduce convective precipitation and tropical disturbances, this study used outputs of a high-resolution climate simulation. Two sets of approximately 30-yr simulations under present-day (control) and warmer climate conditions (global warming) were conducted by the 14-km Nonhydrostatic Icosahedral Atmospheric Model (NICAM) with explicitly calculated convection. For understanding the spatial pattern of future precipitation changes, a further set of a 5-yr simulation [sea surface temperature (SST) + 4 K] was also conducted. Overall, the Asian summer monsoon was well simulated by the model. Precipitation increased as a result of global warming along the monsoon trough, which was zonally elongated across northern India, the Indochina Peninsula, and the western North Pacific Ocean. This increased precipitation was likely due to an increase in precipitable water. The spatial pattern of the increased precipitation was associated with enhanced cyclonic circulations over a large area along the monsoon trough, although it was difficult to determine whether the large-scale monsoon westerly was enhanced. This enhancement can be explained by future changes in tropical disturbance activity, including weak tropical cyclones. However, over part of South Asia, circulation changes may not contribute to the increased precipitation, suggesting regional characteristics. The regional increase in precipitation along the monsoon trough was mostly explained by the uniform increase in SST, whereas SST spatial patterns are important over some regions.</jats:p>

収録刊行物

  • Journal of Climate

    Journal of Climate 33 (18), 8147-8164, 2020-09-15

    American Meteorological Society

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