【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。更多还原

【Abstract】 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,resulted from the interaction of mid-and low-latitude 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.更多还原