2007年梅雨期副热带高压进退特征与对流系统演变  

Advance and Retreat Features of Subtropical High and Evolution of Convective System During Meiyu Period in 2007

作　　者：吕梅[1] 邹力[1] 

机构地区：[1]解放军理工大学气象学院,南京211101

出　　处：《暴雨灾害》2010年第1期1-6,13,共7页Torrential Rain and Disasters

基　　金：国家自然科学基金项目(40975031);江苏省气象科研基金项目(K200715);解放军理工大学气象学院基础理论研究基金项目共同资助

摘　　要：利用NCEP2.5°×2.5°再分析资料和FY-2C的空间分辨率为0.1°×0.1°、时间分辨率为1h的TBB资料,分析并描述2007年梅雨过程中西太平洋副热带高压进退过程以及在有利的大尺度背景场下副高北侧中小尺度对流系统的演变特征,并具体分析江淮流域一个中尺度对流系统(MCS)的初生、发展和消亡过程。结果表明:TBB资料可较好地描述西太平洋副热带高压北抬及西进和东退、中断特征,及其强度和位置;当年6月29日至7月10日位于副高北侧、影响江淮流域的降水过程有4次,每次过程包含1～3个中尺度系统生消过程,中尺度对流系统不断生成发展导致当年梅雨期区域性暴雨和大暴雨;MCS个例由两个发展起来的β中尺度深对流系统合并而成,合并后MCS原地停留8h,与活跃于美国中部的中尺度复合体(MCC)外形有相似特征;TBB<230K的区域与降水区对应,强降水区与TBB为210～220K的区域对应。Using the NCEP 2.5°×2.5°reanalysis data and the TBB data with spatial resolution which is 0.1°×0.1° and the time resolution which is 1 hour provided by FY-2C, the characteristics of the advance and retreat of the West Pacific Subtropical High during Meiyu period in 2007 are analyzed, and the evolution features of mesoscale convective systems which are at the favorable large-scale ambient field and under the north side of the subtropical high are described. The genesis, development and disappearing of a mesoseale convective system （MCS） in the Yangtze-Huaihe River region are practically analyzed. The results indicate that the characteristics of the lifting northward, advancing westward, withdrawing eastward and intermitting of the West Pacific Subtropical High and its intensity and location are clearly described with TBB data. The four precipitation processes locate in the north of the Subtropical High and produce effects in Yangtze-Huaihe River region from 29 June to 10 July in 2007, and there were 1-3 mesoscale processes in each process. The continual genesis and development of MCS lead to heavy rain and extra heavy rain during the Meiyu period. The MCS is merged with two developing β mesoscale deep convective systems and stays for 8 hours, and it is similar to the MCC which is active in the central United States in appearance. The region of TBB〈230 K is corresponding to the precipitation area, and the heavy precipitation area is corresponding to the region of TBB 210--220 K.

关 键 词：TBB资料 梅雨 西太平洋副热带高压 中尺度对流系统 

分 类 号：P447[天文地球—大气科学及气象学] P458.121