京津冀大暴雨个例中尺度诊断分析  

Mesoscale Analyses of a Heavy Rainfall Event in North China

作　　者：吴彬贵[1] 姚学祥[2] 王庆元[2] 孟冬梅[2] 

机构地区：[1]北京大学物理学院大气科学系,北京100871 [2]天津市气象局,天津300074

出　　处：《气象科技》2007年第3期368-373,共6页Meteorological Science and Technology

摘　　要：利用NCEP再分析资料、地面加密降水资料、雷达资料,采用Shuman-Shapiro滤波方案对2005年8月16日京津冀大暴雨的大尺度流场和中尺度系统进行诊断分析。分析表明:暴雨发生在高低空流场及中低纬系统配置非常有利的天气背景下,是多种尺度天气系统相互作用的结果;在对流性不稳定层结中,冷空气沿等熵面侵入到中尺度辐合系统中,激发了中尺度低涡的迅速发展,在孟加拉湾和南海源源不断输送的水汽配合下,导致了暴雨的发生;中β尺度对流雨团发生在滤波后1000 hPa等压面的低涡中心北侧和850 hPa中α尺度辐合线南侧,呈现暖式切变的降雨特征。The characteristics of the large-scale circulation background and mesoscale systems of the North China heavy rain storm occurred on 16 August 2005 are studied on the basis of the NCEP reanalysis data, surface hourly precipitation data, Doppler data and Shuman-Shapiro filter method. Results show that the heavy rainfall event occurred under the favorable environmental conditions, re.suited from the interaction of mid-and low-lati- tude systems. The mesoscale convergence and the mesoscale low triggered the occurrence of the heavy rainfall. Rain clusters bringing the heavy rainfall were related to meso-β systems. The meso-β mesoscale rain clusters appeared to the north of the cyclone center on 1000 hPa after filtering and to the south of the meso-α convergence line on 850 hPa.

关 键 词：中尺度低涡 大暴雨 物理量场 雷达回波 

分 类 号：P458.121.1[天文地球—大气科学及气象学]