双线偏振雷达在郑州“7.20”极端暴雨中的应用分析  

Application analysis of dual linear polarization radar in Zhengzhou "7.20" extreme rainstorm

作　　者：王倩倩 杨金红[2] Wang Qianqian;Yang Jinhong(He nan Meteorological Observation Data Center,Zhengzhou 450000;Meteorological Observation Center of CMA,Beijing 100081)

机构地区：[1]河南省气象探测数据中心,郑州450000 [2]中国气象局气象探测中心,北京100081

出　　处：《气象水文海洋仪器》2023年第3期98-101,共4页Meteorological,Hydrological and Marine Instruments

摘　　要：2021-07-20郑州遭遇了极端暴雨天气,造成了巨大的人员伤亡和经济损失,文章利用洛阳S波段双线偏振雷达资料对此次暴雨过程进行了分析。结果表明:此次过程降水强度大,强降水持续时间长;强降水回波和逆风区的持续存在,是造成郑州极端降水的重要因素;低质心结构、差分反射率因子柱和差分传播相移率柱均在融化层高度以下,表明郑州极端降水时段以液态降水为主,强降水中心扁椭球形大雨滴数浓度高,近地面降水效率高。The extreme rainstorm occurred in Zhengzhou on July 20,2021,which caused huge casualties and economic losses.This paper analyzes the rainstorm process by using the data of Luoyang S-band dual linear polarization radar.The results show that the precipitation intensity of this process is large and the duration of heavy precipitation is long.The persistence of strong precipitation echo and upwind area is an important factor causing extreme precipitation in Zhengzhou.The low-quality core structure,the differential reflectivity factor column and the differential propagation phase shift column are all below the height of the melting layer,indicating that the extreme precipitation period in Zhengzhou is dominated by liquid precipitation.The number concentration of flat ellipsoidal heavy raindrops in the heavy precipitation center is high,and the near-surface precipitation efficiency is high.

关 键 词：极端暴雨 双线偏振雷达 逆风区 差分反射率因子柱 差分传播相移率柱 

分 类 号：P412.25[天文地球—大气科学及气象学]