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《Chinese Journal of Atmospheric Sciences》 2004-02
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A Study of Mesoscale Wind Structures in Heavy Rainfall System of Merging Cloud with Dual-Doppler Radar

Liu Liping 1), Shao Aimei 2), Ge Rensheng 1), and Liang Haihe 1)1) (Chinese Academy of Meteorological Sciences,Beijing 100081) 2) (Department of Atmospheric Sciences, Lanzhou University,Lanzhou 730000)  
The Dual Doppler radar data observed by the National Key Program for Developing Basic Sciences “Research on the Formation Mechanism and Prediction Theory of Hazardous Weather over China” in 2002 are used to analyze the mesoscale structures of reflectivity and wind in the heavy rainfall system from July 22 to July 23 in middle reach of the Yangtze River over Yichang and Jingzhou region. The results show that the heavy rainfall is cause by merging cloud process. The convective clouds, which often organized in band shape, are developed within stratus cloud. The wind and reflectivity in convective cloud have obvious mesoscale structures which are different with that in stratus. The wind shear and convergence below the height of 4 km cause the heavy rainfall. The convective rainfall is often related with mesoscale wind shear, vortex, convergence and divergence.
【Fund】: 国家重点基础研究发展规划项目G1 9980 40 90 9资助
【CateGory Index】: P458.121.1
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