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中文摘要: 运用双向嵌套的中尺度数值预报模式MM5,对1999年6月下旬长江中下游一次暴雨过程进行了数值模拟。结果表明,该模式能较好地模拟这次暴雨过程。中β尺度低压涡旋是该暴雨的主要影响系统,其稳定,移动缓慢是暴雨发生的根本原因。高层大气辐散,中低层强辐合,垂直运动强烈,低层有充足的水汽供应,低层对流不稳定能量释放是低涡及暴雨维持和发展的动力机制。
中文关键词: 梅雨锋暴雨，MM5，数值模拟
Abstract:Using the two-way nested grid mesoscale model (MM5), a heavy rain event over the middle and the lower reaches of the Changjiang River on the last ten days of June in 1999 is simulated. It is shown that the MM5 model can successfully simulate the event. The slowly motion of the meso-β vortex is the basic cause for the event. The high-level atmosphere divergence and the low-level atmosphere convergence, the strong vertical motion, the low-level plenty vapor source and the releasing of the convective unstable energy are of the dynamical mechnism of the vortex and of the maintaining and growing of the rain.
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引用文本：
李红莉,沈桐立,谢有才,2005.一次梅雨锋暴雨的模拟与诊断分析[J].气象,31(3):22-26.
,2005.Simulation and Analysis of a Meiyu Heavy Rain[J].Meteor Mon,31(3):22-26.
李红莉,沈桐立,谢有才,2005.一次梅雨锋暴雨的模拟与诊断分析[J].气象,31(3):22-26.
,2005.Simulation and Analysis of a Meiyu Heavy Rain[J].Meteor Mon,31(3):22-26.