“浪卡”不对称结构和异常暴雨落区分析  

Analysis of "Nangka" Asymmetric Structure and Abnormal Rain Fall Area

作　　者：吴秀兰[1] 李霞[1] 卢山[1] 

机构地区：[1]广东省气象台,广东广州510080

出　　处：《气象研究与应用》2011年第3期5-7,83,I0002,共5页Journal of Meteorological Research and Application

基　　金：广东省科技厅技术研究与开发项目"南海热带气旋发生发展研究"(2009B080701108);中国气象科学研究院灾害天气国家重点实验室开放课题(2008LASW-B05)联合资助

摘　　要：使用美国国家环境预报中心(NCEP/NCAR)的再分析资料、日本GSM产品、广东省遥测站资料、卫星云图以及MICAPS资料,通过合成分析方法,研究0904号热带风暴"浪卡"结构和异常暴雨落区原因。结果表明:(1)"浪卡"结构的强不对称性主要是由于流场分布不均匀这一动力因素造成,"浪卡"大风区分布在南侧和东侧地区,其北侧和西侧风速较小;(2)强降雨中心偏离浪卡移动路径,出现在珠江口以西,主要原因是由于珠江口附近强垂直风切变的环境场使得"浪卡"登陆后快速减弱,且其整体结构上下分离,中高层云系受高空气流引导南南西移,配合西南气流也在珠江口西侧汇合所致。Basing NCEP/NCAR reanalysis data, data, satellite images and MICAPS data, using storm ＂Nangka＂ and the cause for abnormal rain Japan＇s GSM products, information, Guangdong telemetry synthetic analysis method, the structure of‘0904’ tropical fall area were analyzed. The results show that（1） the cause of ＂Nangka＂ strong asymmetry structure is uneven distribution of flow field. The strong （weak） wind area locates to the south and east （north and west） of ‘Nangka＇. （2）Deviating ＂Nangka＂ moving path, the heavy rainfall area located in the west of the Pearl River estuary. The reason is that vertical wind shear environment field makes ＂Nangka＂ weakened quickly after landing. Overall structure separate into the upper and lower parts. The high-level clouds are guided by High altitudes air to move southwestward. Correspondingly, the southwest airflow also converged in the west of the Pearl River estuary.

关 键 词：浪卡 不对称结构 暴雨落区 

分 类 号：P457.6[天文地球—大气科学及气象学]