台风海棠造成河南暴雨过程的位涡分析  

Analysis of Potential Vorticity for the Rainstorm Processes in Henan Province Caused by Typhoon Haitang

作　　者：靖春悦[1,3] 寿绍文[1] 贺哲 李平 乔春贵 范学峰 

机构地区：[1]南京信息工程大学大气科学系,江苏省气象灾害重点实验室,河南省许昌市气象局210044 [2]河南省气象台 [3]河南省许昌市气象局

出　　处：《气象》2007年第4期58-64,共7页Meteorological Monthly

基　　金：国家自然科学基金项目(40405009;40575022;40205008);江苏省气象局科技开发项目(200406);江苏省气象灾害重点实验室项目(KLME050201);国家重点基础研究发展规划项目(2004CB418301);江苏省自然科学基金项目(BK2005141)

摘　　要：采用NCEP/NCAR再分析资料对2005年台风海棠影响河南所造成的三个阶段的区域性暴雨进行位涡分析,揭示了此次台风暴雨产生的机制。结果表明:台风海棠低压环流呈现为高位涡结构。它造成的河南第一个阶段强降水是在台风东北部的东南急流南侧产生的;第二和第三个阶段是由于台风到达较高纬度后,与西风带高位涡冷空气相互作用而产生的远距离暴雨。同时,高空西风急流的南移有利于高位涡的向南输送,对于暴雨的增幅具有促进作用。Based on the analysis of the potential vorticity（PV） on isentropic surface in the three phases of regional rainstorm in Henan Province caused by Typhoon Haitang, the mechanism for the generation of the rainstorm is disclosed. The results show that typhoon is a system with high PV value, the first rainstorm phase is generated in the south to the southeasterly jet stream which lies in the northeastern part of typhoon. The second and the third phases are the rainstorms far from the typhoon. They occur because of the interaction of typhoon and cold air with high PV when typhoon reaches the relatively high latitude. In addition, the southward shift of upper level jet stream is advantageous to the southward transportation of high value PV and can promote the intensification of rainstorm.

关 键 词：台风 位涡 冷空气 暴雨 

分 类 号：P444[天文地球—大气科学及气象学]