2010年5月我国南方持续性暴雨过程分析  

Analysis of Precipitation and Affecting Systems Features on Persistent Heavy Rain in South China in May 2010

作　　者：王晓芳[1] 徐明[1] 闵爱荣[1] 张端禹[1] 杨荆安[1] 崔春光[1] 廖移山[1] 

机构地区：[1]中国气象局武汉暴雨研究所,武汉430074

出　　处：《暴雨灾害》2010年第2期193-199,共7页Torrential Rain and Disasters

基　　金：国家自然科学基金项目(40930951;40575029);科技部科研业务专项(0806;0901;1001);公益性行业科研专项(200906010);湖北省气象局科技发展基金项目(2008Y02)共同资助

摘　　要：使用NCEP日再分析资料和常规降水观测资料,对2010年5月5—23日我国南方地区持续性暴雨过程雨情及影响系统特征进行了初步分析。结果表明:乌拉尔山阻塞高压和贝加尔湖低压大槽异常偏强并稳定维持、副热带高压偏强偏南且维持在20°N以南是有利于持续性暴雨发生的稳定环流型;旺盛的水汽输送及其辐合带维持在江南至华南北部为南方持续性暴雨发生提供了充足的水汽条件;高原东侧或东移、或停滞的西南低涡和切变气流中频繁活动的涡旋是造成江南至华南持续性暴雨过程的重要中尺度对流系统。Using the NCEP 1°×1° daily data and conventional observation data, the spatial-temporal distribution of precipitation and affecting systems features of the persistent heavy rain occurred during 5—23 May, 2010 in South China are analyzed. The results indicate that the anomalous strengthening Ural blocking pressure, Baikal depression trough systems and the subtropical high are very favorable for the stable maintenance of the circulation systems which is helpful for the occurrence of persistent heavy rain. The belt of vapor flux convergence stably keeps on South China, which provides enough vapor condition. The moving eastward or stagnating southwest vortex and the active vortex in the shear airflow are the important mesoscale convective systems which lead to the persistent heavy rain in South China.

关 键 词：华南 持续性暴雨 西南低涡 涡旋 

分 类 号：P458.121.1[天文地球—大气科学及气象学]