【作者】 王欢； 解以扬； 姚学祥； 吕江津；

【Author】 WANG Huan1,2 Xie Yi-yang2 YAO Xue-Xiang2 Lv Jiang-jin2 (1、Department of Atmospheric Sciences,NUIST,Nanjing,210044; 2、Tianjin Municipal Meteorological Bureau,Tianjin,300074)

【机构】 南京信息工程大学大气科学系； 天津市气象局；

【摘要】 利用NCEP再分析资料、自动站观测资料和雷达资料,对2005年8月16～17日发生在华北的一次暴雨过程的环流特征和中尺度系统的演变特征以及成因做诊断分析。结果表明:中尺度辐合线及辐合线上的中-β尺度的对流系统是造成这次强降水的主要影响系统,同时干冷空气的侵入对这次暴雨过程的发生、发展有重要的作用。在暴雨产生前对流层低层干冷空气的楔入而引起的动力抬升是这次暴雨过程的触发机制,随着干冷空气的向低层的侵入有利于中尺度气旋的发展,从而使暴雨过程得以维持和加强。更多还原

【Abstract】 A heavy rainstorm happened in North China during the period from 0000 UTC 16 August to 0000 17 August 2005, and the strongest rainstorm occur in Tianjin. By use of radar, surface observation data and NCEP reanalysis data, the circulation features and the evolution of the mesoscale systerm of heavy rain in North China during 16～17 August 2005 were diagnosed and analyzed. The results show that the mesoscale convergence line is the modification system for heavy rain.Dry cold air had important impaction on this rainstorm:the dynamical lifting with cold air intrusion from the low layer of troposphere play an important role in the first Period of this rainstorm, and the dry air in troposphere intruded into the lower layer was propitious to the maintain and development of the rainstorm.更多还原