江西大暴雨天气闪电分布与回波强度关系  

Relationship between Lightning Distribution and Radar Echo Intensity in Heavy Rainstorm Weather in Jiangxi Province

作　　者：刘东育 LIU Dongyu(Jiangxi Provincial Climate Center,330096,Nanchang,PRC)

机构地区：[1]江西省气候中心,南昌330096

出　　处：《江西科学》2024年第3期639-643,共5页Jiangxi Science

基　　金：国家自然科学基金项目(41975001);江西省科学技术厅2021年省级科技计划“江西省03专项及5G项目”(20212ABC03A29);江西省气象局重点科研项目(JX2022Z04)。

摘　　要：大暴雨过程中的闪电分布与雷达回波强度关系密切,根据闪电强弱可间接判断雷达回波的强弱变化,为分析回波系统演变趋势提供线索。使用自动站数据、常规天气图、闪电数据和雷达拼图等资料,采用雷电知识、雷达气象学原理及分析方法,对江西2022年4次大暴雨过程的暴雨实况、天气系统、闪电分布、雷达回波特征等进行分析,总结闪电与回波关系。结果表明,江西2022年汛期出现4次较大范围的大暴雨天气过程,主要分布在赣中赣北等地。500 hPa低槽、850 hPa切变线、100 hPa分流区、中等强度CAPE、低空急流和超低空急流等天气系统是造成江西大暴雨天气主要因素。另外,当强回波区≥45 dBZ时,与闪电密集区以及强降水区有对应关系,密集强闪电往往会比强回波和强降水超前出现。研究结果为江西大暴雨过程中闪电分布与雷达监测预警预报提供了分析依据。The distribution of lightning during heavy rainstorm is closely related to the intensity of radar echo,and the intensity change of radar echo can be indirectly judged according to the intensity of lightning,which provides clues for analyzing the evolution trend of echo system.Using automatic station data,conventional weather map,lightning data,radar mosaic and other data,using lightning knowledge,radar meteorology principles and analysis methods,this paper analyzes the rainstorm reality,weather system,lightning distribution,radar echo characteristics,etc.of the four heavy rainstorm processes in Jiangxi in 2022,and summarizes the relationship between lightning and echo.The results show that there are four large-scale heavy rainstorm weather processes in the flood season of 2022 in Jiangxi,which are mainly distributed in central and northern Jiangxi.The weather systems such as 500 hPa low trough,850 hPa shear line,100 hPa diverging area,medium intensity CAPE,and low level jet stream and ultra-low level jet stream were the main factors causing heavy rainstorm in Jiangxi.There is a corresponding relationship between the strong echo area of≥45 dBZ and the areas with dense lightning and heavy precipitation.Dense strong lightning often leads the appearance of strong echoes and heavy precipitation.The research results provide an analytical basis for lightning distribution and radar monitoring,early warning and forecasting during heavy rainstorm in Jiangxi province.

关 键 词：大暴雨 天气系统 闪电分布 dBZ 

分 类 号：P458[天文地球—大气科学及气象学]