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OBSERVATIONAL ANALYSIS OF asymmetric distribution of convection ASSOCIATED WITH TROPICAL CYCLONES “CHANCHU” AND “PRAPIROON” MAKING LANDFALL ALONG THE SOUTH CHINA COAST

引用

Journal of Tropical Meteorology 2010年第2期16卷 171-180页

作者：袁金南周文黄辉军廖菲 Guangzhou Institute of Tropical and Marine Meteorology CMA Laboratory for Atmospheric Research Department of Physics and Materials Science City University of Hong Kong

Observational data of mesoscale surface weather stations and weather radars of Guangdong province are employed to analyze the asymmetric distribution of convection prior to, during and after landfall for tropical cyclones of Chanchu and Prapiroon making landfall on the south China coast in 2006. The results showed that strong convection is located in the eastern and northern sectors of the landfalling Chanchu and Prapiroon, namely in the front and right portions of the TC tracks, for a period of time starting from 12 h prior to landfall to 6 h after it. Their convection also had distinct differences in the vertical direction. The analysis indicated that although the landfall of Chanchu and Prapiroon has the same asymmetric distribution of convection, the causes are not exactly the same. The asymmetric distribution of convection in the case of Chanchu is mainly correlated with the impacts of a strong environmental vertical wind shear, low-level horizontal wind shear, and low-level convergence and divergence. In the case of Prapiroon, however, the asymmetric distribution of convection is mainly associated with the impacts of low-level convergence and divergence.

关键词： asymmetric distribution of convection tropical cyclones Chanchu and Prapiroon observation alanalysis

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