风廓线雷达资料在一次大暴雨过程分析中的应用  

Application of Wind Profiler Data in the Analysis of a Heavy Rainstorm Process

作　　者：吴彩霞 汤建国 彭小燕 顾天真 张琪 梅一清 WU Caixia(Nantong Meteorological Bureau,Nantong 226018,China)

机构地区：[1]南通市气象局,江苏南通226018

出　　处：《安徽农学通报》2020年第23期143-146,共4页Anhui Agricultural Science Bulletin

基　　金：南通市气象局气象科技项目(NQK201803)。

摘　　要：利用风廓线雷达资料、常规气象资料、自动站和NCEP/FNL(1°Ⅹ1°)再分析资料对2017年6月10日的一次大暴雨过程进行分析,结果表明:(1)低层风暴相对螺旋度(SRH)的变化对降水系统的临近和降水的开始具有一定的预示作用,降水每次开始前低层风暴相对螺旋度(SRH)均会有所上升。(2)大暴雨过程中雨强最大时期中低层最大风速高度差距减小,存在中低层急流轴变窄的过程。低层最大风速高度降低比中层最大风速高度降低提前0.5~1h。(3)降水开始前,低空急流基本从1km以下开始;低空急流的建立和发展,使得上下层垂直风切变增大,正涡度环流加强,为强降水的产生提供了很好的动力条件。A heavy rainstorm on June 10,2017 was analyzed by using wind profiler data,routine meteorological data,automatic weather stations and NCEP/FNL(1°x1°)reanalysis data.The results showed that:(1)The variation of the relative helicity(SRH)of low-level storms can predict the approach of precipitation system and the beginning of pre⁃cipitation.The relative helicity(SRH)of low-level storms increases before each precipitation start.(2)There is a nar⁃rowing process of the jet axis in the middle and lower layers during the maximum rainfall intensity period.The de⁃crease of the maximum wind speed height in the lower level is about half an hour to one hour earlier than the de⁃crease of the maximum wind speed height in the middle level.(3)Before the precipitation,the low level jet stream starts from less than 1km.With the establishment and development of low-level jet,the Vertical Wind Shear of up⁃per and lower layers increases,and the positive vorticity circulation strengthens.

关 键 词：风廓线雷达 大暴雨 风暴相对螺旋度 

分 类 号：P458.121.1[天文地球—大气科学及气象学]