西北地区东部一次持续性暴雨的成因分析  

The contributing factor analysis of a continued heavy rain case in eastern part of northwest China

作　　者：陈添宇[1] 陈乾[1] 付双喜[1] 毛玉琴 

机构地区：[1]甘肃省人工影响天气办公室,兰州730020 [2]甘肃省山丹县气象局,甘肃山丹734100

出　　处：《气象科学》2009年第1期115-120,共6页Journal of the Meteorological Sciences

基　　金：国家科技攻关计划(2004BA901A16);甘肃省气象局(2001人影-1-2)

摘　　要：分析了西北地区东部一次副高西北侧西南气流型的暴雨过程。结果表明,这次暴雨是中α和中β尺度对流云团引发的强对流性降水。青藏高原云团移到川西北后出现更新,老云团消亡时在其前方有新云团生成。冷锋云带到达甘肃河东地区后,其前缘也触发对流云团,受四川盆地强水汽输送带影响,新云团一般生成在水汽输送带左侧。强雨区产生在冷锋云带与对流云团结合时,对流云团的发展是水汽输送及天气系统辐合和有利的局地环境条件如双层对流不稳定加地形等多因子综合作用的结果。区域性暴雨出现在冷锋云带与对流云团叠加区,这里降水效率高。强雨区大多位于对流云团的西北或东北部与冷锋云带结合处。In this paper a case heavy rain of southwest air stream type over northwest edge of subtropical high has been analyzed. The results show that this heavy rain is caused by strong convective precipitation generated in meso-α and meso-β convective cloud cluster. When the cloud cluster over Qinghai-Xizang plateau moves onto northwest Sichuan, the replacement occurs that the new cloud cluster supersedes in front of the old. Convective cloud cluster have been triggered from front edge of cold-front cloud zone when the latter moves onto eastern part of Gansu . In general, the new cloud clusters occur to the left of strong vapor transfer belt over Sichuan basin. The heavy rain area is generated when cold-front cloud zone combines with convective cloud cluster. As a result of many factors such as vapor transfer, synoptic system convergence , favorable local environmental and orographic conditions and so on the convective cloud cluster is developed. The regional heavy rain occurs inlaid with cold-front cloud zone and convective cloud cluster area where the precipitation efficiency is high. The heavy rain area is located in northwest or northeast part of convective cloud cluster where it associated with cold-front cloud zone.

关 键 词：暴雨 冷锋云带 诊断分析 

分 类 号：P426.62[天文地球—大气科学及气象学]