豫西突发性暴雨成因  

Cause Study of Abrupt Rainstorm in Western Henna

作　　者：王新敏 张霞 范学峰[2] 何立富 

机构地区：[1]河南省气象台 [2]河南省气象局,郑州450003 [3]国家气象中心,北京100081

出　　处：《气象科技》2010年第1期15-20,145,共7页Meteorological Science and Technology

摘　　要：利用常规观测、FY-2C气象卫星资料及NCEP/NCAR再分析资料,对2007年7月28～30日豫西卢氏县引发历史罕见山洪暴雨的进行了天气动力学和中尺度分析。结果表明:西太平洋副热带高压增强与贝加尔湖高压叠加形成阻塞形势,其西侧低空急流携带大量水汽与较强的锋生场交汇在豫西,导致了这次极端暴雨事件的发生;大尺度强斜升运动区中,低层存在一个条件性对称不稳定机制,引发中β云团生成、合并、发展,从而造成暴雨。The conventional observation,weather satellite,and NCEP/NCAR reanalysis data are used to perform the dynamic and mesoscale analyses of the rare mountain flood in history in Lushi County in the western Henna Province from 28 to 30 July in 2007. The results show that the sub-tropic high over the West Pacific enhanced and overlapped on the Begal high and thus resulted in a blocking pattern; the low-level jet with a large amount of water vapor converged around the strong frontogenesis field in the west of Henna,which led to the occurrence of the extreme rainstorm. In the strong inclined ascending motion area,there was a conditional symmetric unstable mechanism at lower levels,which caused the occurrence and development of the meso-β clouds,and consequently induced the rainstorm.

关 键 词：暴雨山洪 湿位涡 湿Q矢量锋生函数 条件性对称不稳定 中β云团 

分 类 号：P426.62[天文地球—大气科学及气象学]