陕西中部一次远距离台风暴雨过程成因分析

2010年第03号台风“灿都”诱发渭河流域7月23日出现了远距离台风暴雨,利用常规高空、地面观测资料、NCEP/NCAR逐6h1°×1°再分析资料以及FY2E卫星云图资料对该次暴雨的成因进行了分析,结果表明登陆台风对暴雨的作用主要表现在以下几个方面:①为暴雨提供了水汽和能量,②为暴雨区低层提供了较强的正涡度平流,③为中尺度暴雨系统的形成提供了有利的环流背景,直接或间接地影响了中尺度云团的生消.地面中尺度系统是中尺度云团的直接影响系统,而低空急流是中尺度云团的动力源；强降雨时段与云顶亮温TBB小于等于233K区域有较好的对应关系.

Analysis of a Rainstorm Process Influenced by Distant Typhoon in Central Shanxi Province

By using the data of routine radiosonde, surface observation, 6 hour 1°×1° reanalysis and FY 2E satellite clouds, an analysis is made of a rainstorm influenced by a distant typhoon happened on 23 July 2010 over the central Shanxi Province. The results show that the role of the landed typhoon is important for this heavy rainfall in the following aspects: the landed typhoon provided a moisture channel, strong positive vorticity advection, convergence at lower levels, and a favorable circulation background for the rainstorm, directly or indirectly affecting the formation and extinction of mesoscale cloud cluster. The surface mesoscale system was the direct influencing system; the low jet is the power sources; and there is good correlation between the area of rainstorm and the area with TBB less than 233 K.