低空急流暴雨天气概念模型及其雷达回波特征分析  

Conceptual Model of Low Level Jet Rainstorm Weather and Analysis on Its Radar Echo Characteristics

作　　者：周文志[1] 唐熠[1] 王艳兰[1] 孙莹[1] 蒋丽娟[1] 

机构地区：[1]桂林市气象局,广西桂林541001

出　　处：《灾害学》2011年第4期14-18,共5页Journal of Catastrophology

基　　金：国家自然科学基金项目(40865001);广西科学技术厅自然基金项目(桂科自0728076);广西气象局重点攻关项目(QK200727);广西区气象局重点项目(桂气科200904);广西桂林市科技局科技攻关项目(20070216-04)

摘　　要：对2002-2010年广西12个急流暴雨个例进行的分析研究表明,广西急流暴雨是在大尺度背景下,由天气系统和中小尺度系统共同影响的结果,当有低空急流存在的情况下,降水量有明显的增幅作用;对天气背景的分析表明,低空急流暴雨天气概念模型主要有低涡急流型和深槽切变急流型以及副高加强急流型。雷达回波主要有块状、带状和絮状三种类型;再通过分析低空急流暴雨过程的雷达回波强度、回波演变、其他产品特征、回波的源地移动、暴雨落区等主要内容,形成低空急流暴雨的短时预报模型。Analysis on 12 jet rainstorms during 2002-2010 in Guangxi indicates that jet rainstorms in Guangxi,being in large-scale background,are resulted from combined impact of weather system and meso-microscale system.The precipitation has an obvious increasing function as low level jet is existed.It is shown in analysis on weather background that conceptual models of low level jet rainstorm weather are mainly of types as vortex jet,deep groove shear jet and subtropical high strengthened rapids.The radar echo mainly has three types as lump,belt and floe.Then through analyzing the radar echo intensity of low level jet rainstorm process,echo evolution,other product characteristics,echo source migration,rainstorm area,etc.,a short-term forecast model of low level jet rainstorm is worked out.

关 键 词：急流暴雨 概念模型 雷达回波 广西 

分 类 号：TN958[电子电信—信号与信息处理] P426.62[电子电信—信息与通信工程]