双月刊

ISSN 1006-9895

CN 11-1768/O4

两次不同季风强度背景下的西行台风登陆过程降水特征对比分析
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1.金华市气象局;2.中国科学院大气物理研究所云降水物理与强风暴院重点实验室LACS;3.南京信息工程大学,气象灾害预报预警与评估协同创新中心/气象灾害教育部重点实验室/大气科学学院,江苏 南京 210044

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吉林省科技发展计划项目(20180201035SF),金华市气象局青年项目(2020QN07),国家自然科学基金面上项目(41875070),金华市气象局金华气象公共服务创新团队。


Comparative Analysis of Precipitation Characteristics of two Westward Landfall Typhoon under Different Monsoon Background
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    摘要:

    本文使用CMORPH卫星反演降水资料和日本再分析资料JRA-55等,选取了登陆前后季风强度不同,路径形似且登陆后均在湘南地区引发强降水的0604号台风“碧利斯”和0708号台风“圣帕”,从对流发展的不稳定能量来源、抬升机制和环境风垂直切变方面进行对比。分析表明,在下垫面和地形基本一致的情况下,两台风导致强降水的主要成因却不同,主要体现在引发对流并使对流维持的主要影响因子不同。与强季风背景密切相关的低层强烈辐合抬升和对流不稳定层结是导致“碧利斯”暴雨形成的主要因素,而弱季风背景下“圣帕”的暴雨则主要是局地地形抬升和斜压不稳定导致的。而且与“圣帕”相比,“碧利斯”降水存在明显的非对称性,季风气流间接通过改变环境风垂直切变导致这种降水分布特征。

    Abstract:

    In this paper, two westward landfall typhoon cases “Bilis” and “Sepat” are taken as research objects, which both caused heavy rainfall in southern Hunan province, however, under different monsoon background. Using CMORPH precipitation product, JRA_55 reanalysis data and TBB data from FY-2E satellite, instable energy source of convection, uplift mechanism and vertical shear of environmental wind were compared between cases “Bilis” and “Sepat”. The comparative analysis shows that under basically same underlying surface and terrain, the main causes of rainstorm by two cases are different, which is mainly reflected in the factors that initiate and maintain convection. The strong convergent updraft and convective instability under the strong monsoon background are the main factor causing the heavy rainstorm of “Bilis”, while the rainstorm of “Sepat” was mainly caused by local orographic lift and baroclinic instability under the weak monsoon background. Moreover, monsoon flow could lead to obviously asymmetric precipitation by changing vertical shear of environmental winds indirectly.

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  • 收稿日期:2020-01-02
  • 最后修改日期:2020-09-28
  • 录用日期:2020-12-08
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