一次西南涡东移诱发的罕见暴雨诊断分析  

Diagnostic Analysis of an Infrequent Heavy Rain Event Induced by Southwest China Vortex Moving Easterly

作　　者：郑京华 董光英 梁涛 汪高明 彭盼盼 吴立霞 

机构地区：[1]湖北省荆门市气象局,荆门448000

出　　处：《暴雨灾害》2009年第3期229-234,共6页Torrential Rain and Disasters

基　　金：湖北省气象局重点课题(2004Z03)资助

摘　　要：利用常规观测资料以及自动站、加密雨量站、卫星云图等资料,对湖北省荆门市2007年7月12—13日连续暴雨或大暴雨天气过程进行诊断分析。结果表明:这次暴雨或大暴雨过程是在有利的大尺度环流背景下受中尺度低涡和切变线影响由3个对流云团产生的,中尺度对流云团演变与强降水落区及持续时间有很好的对应关系;西南涡东南侧西南暖湿气流和北侧东风气流共同提供了有利的水汽输送条件;对流层中低层强辐合和上升运动提供了较好的动力条件;"万宜"台风外围东风气流对西南涡的作用及其对西南涡的阻挡,是西南涡得以发展加强且长时间影响荆门并导致连续强降水的重要原因。A diagnostic analysis of a continuous rainstorm caused by southwest vortex in Jingmen,Hubei province on 12—13 July,2007 is made with the conventional observations,intensive observation,rainfall data of automatic precipitation stations,satellite TBB data and so on.The results indicate that the rainstorm or large rainstorm was caused by 3 convective cloud clusters in the advantageous large-scale circulation background because of the impact of mesoscale vortex and shear line.The development of mesoscale convective cloud clusters is well corresponding with the region and duration of severe rainfall.The warm and moist southwest air flow at southeast side of southwest vortex and the easterly air flow at north side provide the advantageous water vapor transport condition.The strong convergence and upwards movement of the middle-lower level troposphere provide the advantageous dynamic condition of the rainstorm.It is an important reason causing the continuous strong precipitation in Jingmen for a long time that the east wind air current of the Typhoon periphery impacts on and blocks the southwest vortex so that the southwest vortex developed and strengthened.

关 键 词：连续暴雨 西南涡 对流云团 中尺度系统 

分 类 号：P458.121.1[天文地球—大气科学及气象学]