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《Plateau Meteorology》 2006-02
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Simulation of Topographic Effect of Hilly Region to the South of Yangtze River and Yunnan-Guizhou Plateau on the Southweat Vortex during a Heavy Rain Process

CHEN Gui-chuan, SHEN Tong-li, HE Di(Department of Atmospherical Sciences,Nanjing University of Information Science andTechnology,Nanjing 210044,China)  
The heavy rain happened in Hunan province on July 22~23,1998 triggered by the Southwest Vortexis numerically simulated using MM5 model.Three numerical experiments are designed-with real topography,without hilly region to the south of Yangtzeriver,without hilly region to the south of YangtzeRiver and Yunnan-Guizhou Plateau.The obtained results are as follows: With the last two experiments,the canalization effect of topography disappears,the thermal difference between south and north was reduced.Then,the lower level jet reduces.Reducing of positive vorticity transport by lower level jet to southwest vortex and shear line,combining with the shear lineled by 500 hPa upper trough,thesouthwest vortex strengthen.All these make the shear line weaker and disappeare finally.The stepped terrain in three experiments are designed also and the canalization effect of hilly region to the south of YangtzeRiver and Yunnan-Guizhou Plateau was validated further.It could accelerate the forming of lowerlevel jet.
【Fund】: 国家自然科学基金项目(40075023)资助
【CateGory Index】: P458.121.1
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