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Triggering and Effects of the Secondary Circulation Associated with Upper and Low-Level Jets in a Heavy Rainfall Process

Zhang Weihuan (College of Meteorology, Science and Engineering University of PLA, Nanjing 211101) Dong Peiming (The Seventh Institute of Air Force, Beijing 100085)Shen Tongli (Nanjing Institute of Meteorology, Nanjing 210044)  
The heavy rainfall process of July 23,1992 in Beijing-Tianjin-Hebei region is successfully simulated by using the meso-scale model MM4 with two-way nested grid By employing the model products with high temporal and spatial resolutions, the secondary circulation associated with upper and low-level jets is diagnosed The results show that the major factors forcing secondary circulation are different from those of typhoons and those of summer cyclones in Changjiang Huaihe river basin The overall secondary circulation is favorable for the accumulation of instability energy before the precipitation and provides a persistent ascending motion in the precipitation process There exists a positive feedback interaction between the heavy rainfall and jets
【Fund】: 国家自然科学基金!49745007
【CateGory Index】: P426.621
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