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Response of the asian summer monsoon precipitation to global warming in a high-resolution global nonhydrostatic model

机译：亚洲夏季季风沉淀在高分辨率全球无水化模型中全球变暖的回应

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摘要

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 Icosa-hedral 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) 1 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 precip-itable 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.
机译：本研究检测了亚洲季风降水对区域规模的全球变暖的反应，重点是季风威斯利亚和季风槽。这是因为亚洲季风沉淀与热带紊乱密切相关。为了再现对流降水和热带紊乱，这项研究使用了高分辨率气候模拟的输出。通过明确计算对流的14公里的非水型ICOSA-HEDLOM大气模型（NICAM）进行两组大约30毫克的气候条件（全球变暖）和温暖的气候条件（全球变暖）。为了理解未来降水变化的空间模式，还进行了一组5 yr模拟[海面温度（SST）1 4k]。总的来说，亚洲夏季季风通过该模型进行了很好的模拟。由于沿着季风槽的全球变暖，降水量增加，这是遍布印度北部，印度靛蓝半岛和西北太平洋的自来伸长。这种增加的沉淀可能是由于沉淀水的增加。增加沉淀的空间模式与沿着季风槽的大面积上的增强型循环循环有关，尽管难以确定大规模的季风西方是否增强。这种增强可以通过未来的热带扰动活动的变化来解释，包括弱热带气旋。然而，在南亚的一部分，循环变化可能没有促进降水量的增加，提出区域特征。沿着季风槽的沉淀沉淀的区域增加主要是通过SST的均匀增加来解释，而SST空间模式对某些地区很重要。

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  • 来源
    《Oceanographic Literature Review》 |2020年第10期|2104-2104|共1页
  • 作者

    H.G. Takahashi; N. Kamizawa; T. Nasuno;

  • 作者单位

    Department of Geography Tokyo Metropolitan University Tokyo Japan;

    Department of Geography Tokyo Metropolitan University Tokyo Japan;

    Department of Geography Tokyo Metropolitan University Tokyo Japan;

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  • 正文语种 eng
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