2013年6月19-20日甘肃陇东南暖区暴雨多普勒雷达特征分析  

Analysis on Doppler Radar Characteristics of Warm Area Rainstorm in Southeastern Gansu During 19-20 June 2013

作　　者：傅朝[1] 杨晓军[1] 周晓军 刘维成[1] 

机构地区：[1]甘肃省兰州中心气象台,兰州730020 [2]甘肃省兰州市气象局,兰州730020

出　　处：《气象》2015年第9期1095-1103,共9页Meteorological Monthly

基　　金：公益性行业(气象)科研专项(GYHY201306006);中国气象局新技术推广项目(CMAGJ2014M54)共同资助

摘　　要：应用天水多普勒雷达资料,分析了2013年6月19-20日甘肃陇东南地区大暴雨过程中暖区降水时段的雷达反射率因子、径向速度及PUP产品特征。结果表明,雷达反射率因子特征与我国东部、南部的暖区暴雨特征极为相似,局地强回波的列车效应明显,强回波一般低于45 dBz,且主要分布于0℃层以下;雷达径向速度反映出对流层中低层的暖平流、风场辐合结构和低空急流的维持有利于强回波及高频次列车效应的产生;γ中尺度涡旋的出现对强降水的临近预报具有明显的指示意义。Based on Tianshui Doppler radar data, characteristics of radar reflectivity, Doppler velocity and PUP products during a warm area rainstorm in Southeastern Gansu Province in 19--20 June 2013 are ana- lyzed. The results show that the characteristics of radar reflectivity are extremely similar with the charac- teristic of warm-area torrential rains in eastern and southern China. The ＂train effect＂ of local strong echo is obvious. Strong echoes are generally lower than 45 dBz, and mainly distribute in below 0℃ layer. It was advantageous to the generation of strong echo and high-frequency ＂train effect＂ that warm advection and wind convergence structure in boundary layer to middle-lower level, low-level jet maintaining showed on Doppler velocity characteristics. The meso-7 scale vortex has indicative significance for the nowcasting of severe precipitation.

关 键 词：暖区暴雨 多普勒雷达特征 回波 反射率因子 

分 类 号：P458[天文地球—大气科学及气象学] P412