一次滇中暴雨中尺度对流系统特征分析

应用MICAPS常规资料、FY-2卫星观测资料及昆明CINRAD-CC雷达回波资料，将诊断分析与探测资料相结合综合分析了2003年7月21日滇中暴雨过程的中尺度对流系统特征，指出：500、700hPa高低层冷暖平流的配置、500hPa低槽、700hPa切变线及地面冷锋是此次暴雨过程的大尺度环境背景；高能高湿的不稳定能量、低层辐合、强的垂直风切疫的存在，利于强对流形成并诱发中尺度对流系统MCS；多普勒雷达上强风暴的发展，与暴雨区范围及强弱对应；多普勒速度图显示，中尺度涡旋、中尺度辐合线、逆风区等多个中尺度系统，是此次滇中强对流暴雨产生的直接影响系统。

AN ANALYSIS ON THE MESOSCALE SYSTEM CHARACTERISTICS OF RAINFALL PROCESS OCCURRED IN CENTRAL PART OF YUNNAN

The mesoscale system characteristics of heavy rainfall in central Yunnan Province on July 21,2003 is analyzed with the MICAPS data, FY-2 satellite observatory data and the observatory data of Kunming CINRAD-3830cc. It is showed that collocation of warm advection at the 500 hPa with cold advection at the 700 hPa,trough at 500 hPa, shear line at the 700 hPa ,and cold front on the surface are the macroscale circulation background which brings on this heavy rainfall process; the favorable environment condition of developing MCS is formed in instability of high energy and high wet,heavy vertical wind shear; the characteristic of Doppler echoes showed that the developing and uniting of heavy convective storm correspond with the region and intensity of the heavy rainfall;mesoscale cyclone, mesoscal convergence line and contrary wind area, which appear in radial velocity, are the direct influence systems which bring on this heavy rainfall process.