“2006．10”云南严重秋季连阴雨水汽输送特征和湿Q矢量分析  

Analysis on water vapour transporting features and wet Q vector of severe autumn lasting rainfall in Oct.2006 in Yunnan province

作　　者：鲁亚斌[1] 普贵明[1] 赵宁坤[1] 李屏 郭荣芬[1] 

机构地区：[1]云南省气象台,昆明650034 [2]云南省临沧市气象局,云南临沧677000

出　　处：《气象科学》2009年第1期64-70,共7页Journal of the Meteorological Sciences

基　　金：2009年云南省气象局预报员专项课题(YB200901)

摘　　要：应用常规气象资料通过诊断分析和湿Q矢量分析,探讨了2006年10月上旬云南严重连阴雨期间的水汽输送特征,进一步分析了期间持续性暴雨、大雨的落区分布,结果表明:连阴雨期间,ITCZ异常活跃,先后有4个热带气旋活动,200616号强台风"象神"横穿中南半岛进入孟加拉湾,减弱之后再度发展成孟加拉湾低压,由此提供了孟加拉湾水汽通道;ITCZ水汽通过副高外围气流向中南半岛输送,提供了第二条水汽通道,两条水汽通道呈"人"字形,为连阴雨发生发展提供了有利的水汽条件。湿Q矢量辐合中心在对流层中低层700～640 hPa之间,700 hPa上湿Q矢量散度辐合区与暴雨区对应较好;随着湿Q矢量辐合区加强、移动和减弱,暴雨随之发展、移动和结束。Observing data, diagnostic analysis and wet Q vector analysis are used to research on the water vapour transporting features during the severe lasting rainfall period of Yunnan Province in first third of October, 2006. Furthermore, the distribution of precipitation area of lasting storm rainfall and heavy rainfall was analyzed. Result indicated that, during the lasting precipitation period, ITCZ was abnormally active, and there were 4 tropical cyclone activities one after another. The 200616 severe typhoon ＂Xiangshen＂ passed across the China-South Asia Peninsula and got into the Bay of Bengal. Then the typhoon weakened and developed to Bengal depression again, which provided the water vapour channel of Bay of Bengal. The transporting of ITCZ water vapour to China-South Africa Peninsula through the flow around the sub-tropical high provided the second water vapour channel. The two water vapour channels formed the shape of ＂人＂ and provided beneficial water vapour condition for the happening of lasting precipitation. Wet Q vector convergence center located at the height of 700 -640 hPa in the middle of troposphere. And at the level of 700 hPa, wet Q diversity convergence area corresponded well to storm rainfall area. With the strengthening, moving and weakening of wet Q vector convergence area, storm rainfall developed, moved and stopped accordingly.

关 键 词：暴雨 诊断分析 湿Q矢量分析 

分 类 号：P458.121[天文地球—大气科学及气象学]