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投稿时间：2006-06-16 修订日期：2007-07-31
投稿时间：2006-06-16 修订日期：2007-07-31
中文摘要: 利用中尺度数值预报模式MM5V3.6，对2005年9月19—21日发生在山东中南
部的区域性切变线暴雨天气过程进行了数值模拟。并用高时空分辨率的模式输出资料，对此
次暴雨过程的湿位涡场特征进行了诊断分析。结果表明：θse面陡立易导致湿斜
压涡度的发展，形成θse陡峭密集区，密集区内容易发生暴雨。通过湿位涡的分
析，揭示了暴雨过程中湿位涡的中尺度演变特征和空间结构，表明切变线暴雨的发生发展与
湿位涡的时空演变有很好的联系。暴雨主要出现在850hPa的ζMPV1负值区和ζMPV2正值区等值线密集区附近，降水中心位于ζMPV1负值中心前部对流
不稳定区中。
Abstract:By using the mesoscale numerical model MM5 V3.6, a successful simulati
on is made for heavy rain event in the central and southern parts of Shandong Pr
ovince on September 19-21, 2005. And the moist potential vorticity of the heavy
rain is analyzed by using high resolution simulation result. The results indicat
e that the stiff moist isentopes excite the development of moist slantwise vorti
city and occurrence of heavy rain. A diagnosis of moisture potential vorticity i
s made to show its temporal and spatial mesoscale characteristics. The results s
how that the development of heavy rain is closely related to the temporal and sp
atial variations of moisture potential vorticity. The heavy rain occurs in the i
soline dense section of the negative MPV1 and positive MPV2, and the rain center
lies in the convective instable section in the front of the negative MPV1 cente
r at 850hPa.
keywords: shear line heavy rain moisture potential vorticity mesoscale temporal and sp
atial characteristics
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引用文本：
吴君,汤剑平,邰庆国,石莹,裴洪芹,2007.切变线暴雨过程中湿位涡的中尺度时空特征[J].气象,33(10):45-51.
Wu Jun,Tang Jianping,Tai Qingguo,Shi Ying,Pei Hongqin,2007.Temporal and Spatial Mesoscale Characteristics of Moisture Potential Vorticity of Shear Line Heavy Rain[J].Meteor Mon,33(10):45-51.
吴君,汤剑平,邰庆国,石莹,裴洪芹,2007.切变线暴雨过程中湿位涡的中尺度时空特征[J].气象,33(10):45-51.
Wu Jun,Tang Jianping,Tai Qingguo,Shi Ying,Pei Hongqin,2007.Temporal and Spatial Mesoscale Characteristics of Moisture Potential Vorticity of Shear Line Heavy Rain[J].Meteor Mon,33(10):45-51.