"2003.6.17"滇中特大暴雨的中尺度分析

结合大尺度环流的高通滤波、卫星云图和雷达回波诊断，用Shuman—Shapiro中尺度滤波方法，对2003年6月17日云南中部的楚雄市至南华县一带发生的特大暴雨过程进行了中尺度分析。结果表明，这次过程是热带中尺度气旋东南移并发展造成的；地面强冷空气侵入中尺度低压导致对流发展，是热带中尺度气旋加强的原因；大尺度环流下，孟加拉湾、南海和北部湾形成的两条水汽输送带通过热带低压，为强对流的发展和维持提供了能源保障；地面中尺度低压中心和与之配置的切变线北侧对特大暴雨落区有较好的指示。

Mesoscale Analyses of Heavy Storm Rain in the Central Part of Yunnan on June 17, 2003

Base on Shuman-Shapiro mesoscale filter mothed, high pass filter under the background of large-scale circulation and analysis of satellite cloud image and radar echo are used to analyze the heavy storm rain in Chuxiong and Nanhua of central Yunnan on June 17, 2003. Results show that the precipitation process is caused by a moved southeastward and well-developed tropical mesoscale cyclone. The surface cold air intruded into the mesoscale depression and led to the development of convective activity, and the cold air was the reason for the strengthening of the tropical mesoscale cyclone. The tansportation of water vapor coming from Begalese Gulf, South Sea and West Pacific Ocean under large-scale circulation provides the energy for the development and maintenance of the severe convection. The low pressure center of surface mesoscale and the north side of the shear line are indicative to the rainfall area.