河西走廊一次突发性暴雨天气的诊断分析  

Synoptic Diagnosis of a Sudden Rainstorm Process in Hexi Corrider

作　　者：滕水昌 渠永兴[2] 王坚 李伯文 张弢 王荣哲 

机构地区：[1]甘肃省永昌县气象局,甘肃永昌737200 [2]中国气象局兰州干旱气象研究所甘肃省干旱气候变化与减灾重点实验室中国气象局干旱气候变化与减灾重点开放实验室甘肃,兰州730020 [3]甘肃省张掖市气象局,甘肃张掖734000

出　　处：《干旱气象》2007年第3期66-71,共6页Journal of Arid Meteorology

基　　金：国家科技攻关项目"祁连山空中水资源开发利用研究"课题资助

摘　　要：对2006年7月14日发生在甘肃省永昌县南部山区的局地强暴雨从天气学、物理量场、水汽条件、降水强度、卫星和雷达特征等方面进行了综合分析,发现500 hPa气旋式风切变是局地强降水形成的主要形势诱发因子,风的垂直切变为上升运动的维持提供了有利条件,有利于对流的产生和发展;由涡旋云系外部气流引发的对流单体,造成了这次局地强对流降水。同时发现高能区和S i场的分析对强对流天气的预测有良好的指示作用。A local heavy rain occurred in the southern mountainous region of Yongchang County on July 14, 2006 was analyzed synthetically from several aspects of physical quantities, moisture condition, precipitation intensity, satellite images and radar features. Results show that the wind shear convergence at the level of 500 hPa is main factor resulting in this weather event, and the wind vertical shear provides favorable conditions to ascent development of airflow; the convective cells caused by the external flow of vortex cloud system bring on this strong convective precipitation. Meanwhile, we found that analysis on energy and Showalter index fields could be a good indication to strong convective weather forecast.

关 键 词：暴雨 分析 甘肃永昌 

分 类 号：P458.121.1[天文地球—大气科学及气象学]