ISSN 1006-9895

CN 11-1768/O4

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

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    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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  • Received:January 02,2020
  • Revised:September 28,2020
  • Adopted:December 08,2020
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