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《Journal of Nanjing Institute of Meteorology》 2001-03
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MECHANISM OF THE FORMATION OF TORRENTIAL RAIN BY COUPLED HIGH/LOW LEVEL JETS OVER THE MIDDLE REACHES OF THE YANGTZE RIVER

ZHU Qian gen 1, ZHOU Wei can 2, ZHANG Hai xia 3 (1.Department of Atmospheric Sciences;2.Department of Mathematics,NIM,Nanjing 210044; 3.Handan Meterological Bureau of Hebei Province,Handan 056001)  
Analysis on the storm rainfall in Wuhan from 08:00 to 14:00 on July 22,1998 illustrates that the process,with the background of an ascending branch of subtropical meridional circulation,is independent of south warm area and north cold air.Low inflow air and high outflow air play an important part in the forming and maintaining of the large scale rain region.The heavy rain is directly resulted from up and low coupling of boundary layer southerly jet,low westerly jet and high westerly jet.Southerly jet at 925hPa is the chief provider of water vapor and trigger of convective instability energy release;moreover,low westerly jet at 850hPa contributes much to the forming and maintaining of convective instability at middle and low level,while mid latitude high westerly jet to the forming and maintaining of symmetrical instability at high level.The storm comes into being owing to coupling of the three jets which develop and strengthen the convective and ascending air movement at mid low level.
【Fund】: 国家重点基础研究发展规划项目“我国重大天气灾害的机理和预测理论的研究”G1 9980 40 90 7;; 中国气象局 “九五”青年基金联合资助
【CateGory Index】: P458.121.1
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