湘西北暴雨对鄂东南降雨影响的合成对比分析  

A compare study of impacts on southeast Hubei Province from rainstorms of northwest Hunan Province

作　　者：张端禹[1] 廖移山[1] 张兵[1] 李红莉[1] 冯光柳[1] 

机构地区：[1]中国气象局武汉暴雨研究所,武汉430074

出　　处：《气象科学》2009年第2期252-259,共8页Journal of the Meteorological Sciences

基　　金：武汉暴雨开放基金重点项目"湘西北-鄂西南暴雨形成机理和数值模拟研究"

摘　　要：先介绍前一天湘西北出现暴雨后,次日鄂东南出现与不出现暴雨的两个个例,然后统计2003—2006年4—9月前一天湘西北出现暴雨前提下次日鄂东南出现暴雨与否的两种情况。应用ECMWF格点分析资料,将6个鄂东南次日出现暴雨个例进行合成,同时选出6个鄂东南次日不出现暴雨个例进行合成。对比研究这两种情况在天气过程前、过程中和过程后天气要素场差别,发现次日鄂东南出现暴雨的情况500 hPa影响低槽偏深、位置偏西、东移速度偏慢;850 hPa江南有西南风急流出现,鄂东南有sθe≥345 K高能舌活动。次日鄂东南不出现暴雨,500 hPa低槽浅、位置偏东、东移较快,鄂东南地区由弱槽转为弱脊;850 hPa江南地区没有出现西南风急流,鄂东南没有sθe≥345K高能舌活动。In this paper, two cases are introduced in which rainstorms occurred first in northwest Hunan Province, but the next day it had heavy rain in southeast Hubei Province in one case only. A statistic is made from April to September in the years of 2003 to 2006 to find out how seriously cloud clusters of rainstorm occurred in northwest Hunan Province would influence southeast Hubei Province. Applying grid data from ECMWF, six rainstorms took place in southeast Hubei Province have been composed while six events which rainstorms did not occur there have also been composed. It＇s discovered that there were quite a lot of differences in these weather elements between two events based on a compare study. The main differences lie in that the trough at 500 hPa was deeper, located farther and moved slowly, that there was an obvious LLJ at 850 hPa, and that there appears an obvious conversion from high energy zone to low energy zone in southeast Hubei Province.

关 键 词：暴雨 物理量要素场 合成对比分析 

分 类 号：P458[天文地球—大气科学及气象学]