双月刊

ISSN 1006-9895

CN 11-1768/O4

2020年夏季川渝地区洪涝灾害及暴雨过程研究
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1.成都信息工程大学大气科学学院;2.中国科学院大气物理研究所

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Analysis of flood disasters and heavy precipitation events in Sichuan-Chongqing region in summer of 2020
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Institute of Atmospheric Physics

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    摘要:

    本文针对2020年夏季川渝地区的强降水产生的洪涝过程及相应的15次暴雨过程进行了分析,并与川渝大旱年同期情况进行了对比。2020年夏季,西太平洋副热带高压(以下简称副高)较气候平均位置偏西、强度偏强,其西伸脊点可达110°E以西;青藏高压东伸、偏强,上下层共同作用使副高稳定维持。中纬度小波动活动频繁,使得冷空气活动往往维持在川渝上空。副高西侧气流与北方偏北风的汇合使川渝地区形成较大的水汽通量辐合区,为暴雨的发生提供十分必要的水汽条件。此外,来自印度的季风气流从印度北部至高原东侧,经由高原南侧向东输送水汽,成为另一支重要的水汽通道。2006年夏季,川渝地区为重要的干旱年,暴雨个例也最少。在这一年,副高偏东,中纬西风带短波槽不活跃,西南季风偏弱,川渝地区水汽辐合较少,这些与2020年形成了鲜明的对比。

    Abstract:

    This paper investigates the flooding events caused by heavy precipitation and the corresponding 15 heavy rainfall events in the Sichuan-Chongqing area in the summer of 2020 year and compares them with the situation in the 2006 drought year. In the summer 2020, the western Pacific subtropical high (WPSH) was stronger compared with its climatological mean, and its western edge was beyond 110°E which is to the west of its climatological position. Since the Qinghai-Tibet high extended eastward and was strong, the upper and lower layers worked in concert to maintain the WPSH steadily. The cold air that causes precipitation in the Sichuan-Chongqing region mainly comes from short waves in the westerlies. The short waves in the mid-latitudes were frequent and influenced the region. Due to the joint influence of the southwesterly flows on the western flank of WPSH, and the northerly wind, the Sichuan-Chongqing region forms an area of major water vapor flux convergence. It provides most favorable water vapor conditions for the occurrence of heavy rainfall events. Furthermore, the monsoon air stream, traveling from northern India to the east side of the plateau, arounds the south side of the plateau and transports water vapor eastward, forming another important water vapor channel. The year 2006 is a typical drought year of the Sichuan-Chongqing region, when fewest heavy rainfall events occurred. In this year, the WPSH is easterly, the short-wave trough in mid-latitude westerlies is not active, the southwest monsoon is weaker, and the water vapor convergence in the Sichuan-Chongqing region is less, which are in sharp contrast with 2020.

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历史
  • 收稿日期:2021-07-25
  • 最后修改日期:2021-10-18
  • 录用日期:2021-10-26
  • 在线发布日期: 2021-11-17
  • 出版日期: