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The PBL Dynamic Diagnosis of Heavy Rain over the Upper Reaches of the Changjiang River

Li Yueqing(Chengdu Institute of plateau Meteorology,Chengdu 610072)  
In this paper,characteristics of the planetary boundary layer(PBL) and its relations with heavy rains in the upper reaches of the Changjiang myer are studied by the diagnostic analysis method The result shows that the PBL has important influence on heavy rains.Heavy rains happen when u,v components in the PBL in Chengdu are negative and it will be clear when the u,v components are positive.The appearance,strengthening and weakening if positive vorticity,convergence and ascending motion in the PBL are connected with the occurrence,development and end of heavy rains.Dynamical trigger in the PBL relating to the topography in the northeast-southwest direction at the eastern edge of Tibetan Plateau is one kind of physical mechanism for heavy rains in the upper reaches of the Changjiang River.
【CateGory Index】: P426.62
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