广西一次大范围西南涡暴雨过程多尺度特征分析  

Analysis of multi-scale characteristics of the heavy rainfall caused by southwest vortex in Guangxi

作　　者：李佳颖[1] 翟丽萍[1] 覃月凤 何珊珊 Li Jiaying;Zhai Liping;Qin Yuefeng;He Shanshan(Guangxi Meteorological Observatory,Nanning Guangxi 53002)

机构地区：[1]广西气象台,南宁530022

出　　处：《气象研究与应用》2018年第3期7-10,I0001,共5页Journal of Meteorological Research and Application

基　　金：广西自然科学基金(2016GXNSFAA380184);广西气象科研计划项目(桂气科2013Z04;桂气科2017M01);广西气象台业务攻关项目"基于‘配料法’的暴雨和强对流短期预报技术研究"共同资助

摘　　要：利用常规观测资料、地面自动站资料、FY2E卫星云图和雷达资料对2014年8月广西一次大范围西南涡暴雨过程大尺度环境特征、中小尺度系统特征等多尺度多角度进行分析,结果表明:西南涡和低涡切变是这次暴雨过程的直接影响系统,雨带与850hPa低涡切变活动密切相关,主要降雨区在西南涡、切变线附近和移动方向的前侧;850hPa水汽通量散度辐合中心、等值线密集区对强降水落区分布有较好的指示意义。降雨过程在一定程度上可以体现为中尺度系统的生消、移动,较强的对流回波和列车效应是造成柳江出现强降雨的重要因素。By using the general observation data, automatic station precipitation data, FY2E satellite data and radar data, the large-scale circulation environment characteristics and meso-micro scale system characteristics of a large scale southwest vor- tex rainstorm in Guangxi in August 2014 were analyzed from multi scale and multi angle. The results show that the southwest vortex and the low vortex shear are the direct influence systems of the rainstorm process. Rain band is closely related to the low vortex shear activity of 850 hPa; the main rainfall area is near the southwest vortex and the shear line or in the front of their moving direction. Water vapor flux divergence center and line intensive areas in 850hPa have a good indication to the distribu- tion of rainfall. To a certain extent, the rainfall process can be reflected as the genesis, dissipation, and movement of the meso- scale system; strong convective echo and train effect are important factors that cause heavy rainfall in Liujiang station.

关 键 词：西南涡 低涡切变 暴雨 多尺度特征分析 

分 类 号：P458.121.1[天文地球—大气科学及气象学]