广西大范围低空急流暴雨的分型及雷达回波特征分析  

Classification of low-level jet stream rainstorm in a wide range of Guangxi and characteristic analysis of radar echo

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

机构地区：[1]桂林市气象局,广西桂林541001

出　　处：《自然灾害学报》2011年第4期159-164,共6页Journal of Natural Disasters

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07280766);广西气象局重点攻关项目(QK200727);广西区气象局重点项目:广西5~8月区域分片持续性暴雨短期预报关键技术研究共同资助;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个低空急流暴雨个例进行了普查分析,结果表明,广西大范围低空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,在有低空急流存在的情况下,降水量有明显的增幅作用;通过对天气背景进行分析,对广西大范围低空急流暴雨天气形势进行了分型,得到了低涡急流型和深槽切变急流型以及副高加强急流型等3种型式。雷达回波主要有块状、带状和絮状3种类型;再通过对大范围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、回波的源地移动和暴雨落区等内容的分析,提出了低空急流暴雨的短期预报模型,为今后广西大范围急流暴雨预报提供参考。General investigation and analysis of 12 low-level jet stream rainstorm examples in Guanxi from 2002 to 2010 were carried out. The results show that under large-scale background the low-level jet stream rainstorm in wide range of Guangxi is formed by interaction between weather system and meso-microscale system Im the case existing low-level jet stream, precipitation has a obvious increasing range function. Through analysis of weather background, the synopic situation of low-level jet stream rainstorm was classified and 3 classes of low-level,jet stream was presented. The radar echo mainly has 3 types：lump, belt and floe types. Then through analyzing echo strength lution and other product characteristcs, the short-term forecast model of low-level jet stream rainstorm was The model can give a reference to forecast of low-level jet stream rainstorm in a wide range of Guanxi. ,echo evoproposed.

关 键 词：低空急流 暴雨 概念模型 雷达回波 

分 类 号：P457.6[天文地球—大气科学及气象学]