2008年8月末湖北连续大暴雨的水汽输送特征  

Features of Moisture Transportation in a Continuous Torrential Rain in Hubei Province at the End of August 2008

作　　者：张端禹[1] 王明欢[1] 陈波[1] 

机构地区：[1]中国气象局武汉暴雨研究所,武汉430074

出　　处：《气象》2010年第2期48-53,共6页Meteorological Monthly

基　　金：公益性行业科研专项(GYHY200906010)资助

摘　　要：2008年8月末湖北出现连续大暴雨,利用常规气象观测资料、自动气象站雨量资料、地基GPS可降水量资料与NCEP再分析资料探讨这次大暴雨过程水汽特征。结果发现:这次过程降雨经历了两次增强与两次减弱;GPS可降水量增加降雨加强,可降水量减小降雨减弱;暴雨发生时整层水汽输送方向是西南向,当其转变为西北向时湖北降雨减弱,整层水汽通量数值大降雨不一定就强;强降雨落区走向与整层水汽辐合中心位置走向对应较好,降雨强度变化趋势与整层水汽辐合数值变化趋势一致,但是两者尚不满足线性函数关系。对于连续大暴雨过程既要关注整层水汽辐合中心位置又要关注整层水汽辐合数值变化趋势。A continuous torrential rain took place in Hubei Province during August 28-29,2008.Features of moisture transport are studied by applying conventionally observed data,the automatic meteorological station data,the ground-based GPS precipitable water and NCEP reanalyzed data.The results show that the rainfall process strengthened and weakened twice,respectively.The rainfall became large as the GPS precipitable water increased.Direction of vertically integrated moisture transport was mainly southwest, but when it turned to be northwest the rainfall became weak.The rainfall didn＇t change simultaneously as the value of vertically integrated moisture transport did.The location of heavy rain moved as zone of vertically integrated moisture convergence moved,precipitation intensity altered as the value of vertically integrated moisture convergence altered though the relation between them wasn＇t linear.Both the area and change tendency of vertically integrated moisture convergence should be paid more attention to.

关 键 词：连续大暴雨 GPS可降水量 整层水汽输送 整层水汽辐合 

分 类 号：P[天文地球]