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投稿时间：2005-01-26 修订日期：2005-11-07
投稿时间：2005-01-26 修订日期：2005-11-07
中文摘要: 利用T106资料和MM5V3.5中尺度非静力模式对2002年6月8—9日发生在陕西和四川东北部的一次突发大暴雨过程进行了数值模拟与诊断分析。模拟结果表明:在有利的大尺度环流形势下,中α尺度切变激发的中β尺度系统是本次暴雨的直接引导系统。进一步诊断分析揭示了中β尺度系统的动力场和热力场之间具有一种强耦合机制:中β尺度系统是在低空急流带上发展起来的,垂直上升运动与近饱和湿空气柱及涡散柱互耦,低空对流不稳定层结的发展触发了强烈的垂直上升运动。模拟结果表明模式能很好地模拟中尺度对流系统的整个发展过程和降水雨带,细网格模拟的降水量与实况比较接近,分析结果可为中尺度暴雨预报提供参考依据。
中文关键词: 大暴雨，中β尺度系统，数值模拟，诊断分析
Abstract:Using MM5V3.5 mesoscale non-hydrostatic model, torrential rain occurring in the Shannxi Province during 8 to 9 June,2002 was simulated and analyzed. The main results are as follows: (1) Under the advantageous macroscale weather situation, the mesoscale-β system by developing along low-level-jet triggered by mesoscale-shear is the main influence system causing the heavy rainfall.(2)Furthermore,there are obvious dynamic-thermodynamic structural features in the developing phase of the mesoscale-β system. That is ,strong divergence column and intensive vorticity column are coupling developed,the intensive ascendant motion is intercoupled with saturated air column,there is a lot of accumulation of instable energy during the development of ascendant motion.MM5 model has the better performence to simulate the mesoscale systems and the torrential rainfall.So these conclusions will be helpful and provide references for the forecast of mesoscale storm rainfall.
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引用文本：
慕建利,杜继稳,梁生俊,宁志谦,2006.中β尺度系统造成的大暴雨过程数值模拟与诊断分析[J].气象,32(8):23-29.
,2006.Numerical Simulation and Diagnostic Analysis of a Heavy Rainfall Caused by Mesoscale-β System[J].Meteor Mon,32(8):23-29.
慕建利,杜继稳,梁生俊,宁志谦,2006.中β尺度系统造成的大暴雨过程数值模拟与诊断分析[J].气象,32(8):23-29.
,2006.Numerical Simulation and Diagnostic Analysis of a Heavy Rainfall Caused by Mesoscale-β System[J].Meteor Mon,32(8):23-29.