2021年盛夏苏中南一次强冰雹过程大气环境与雷达回波特征  

Atmospheric environment and radar echo characteristics of a strong hail event in central and southern Jiangsu in midsummer in 2021

作　　者：陆飞 阮蔚琳 邓雯[2] LU Fei;RUAN Weilin;DENG Wen(Jiangyin Meteorological Bureau of Jiangsu Province,Jiangyin 214432;Institute of Heavy Rain,China Meteorological Administration,Wuhan 430205)

机构地区：[1]江苏省江阴市气象局,江阴214432 [2]中国气象局武汉暴雨研究所,武汉430205

出　　处：《暴雨灾害》2022年第2期167-173,共7页Torrential Rain and Disasters

基　　金：国家自然科学基金重大研究计划(91837206)。

摘　　要：利用常规观测资料、地面加密资料、卫星云图、微波辐射计及雷达探测资料等对2021年7月15日江苏省一次强冰雹过程进行分析。结果表明:(1)强冰雹发生前为副热带高压控制,上游中高空有短波槽和切变活动,地面辐合线触发生成的对流系统向有利于自由对流的南部暖区移动发展,导致了此次冰雹过程的发生。(2)盛夏强冰雹具有较强的LI值、较大的CAPE值、较低的CIN值和较高的0℃层高度等环境参数特征。(3)辐合线依次触发的对流云团向暖区移动发展,形成多个单体风暴。最早触发的对流云团到达的位置最靠南,在盛夏副高西侧西南暖湿不稳定气流的作用下,获得的不稳定能量最多,冰雹强度和范围最大。(4)多单体风暴中组合反射率60 dBz以上且回波顶高超过17 km区域与冰雹发生地较吻合。风暴垂直结构表明6 km以下低层辐合,9 km以上高层辐散的流场,具有明显的悬垂结构。Using conventional observation data,ground intensive observational data,satellite cloud images,microwave radiometer and radar data,a strong hail event in Jiangsu Province on July 15,2021 is analyzed.The results show that:(1)Before the occurrence of strong hail,the weather condition is controlled by the subtropical high.There are short wave trough and shear activities in the middle and upper reaches of the upstream.The convective activities triggered by the ground convergence line developed in the southern warm region where is conducive to free convection,and continuously obtained the unstable energy in the warm region,which leads to the occurrence of the hail event.(2)Strong hail in midsummer has the characteristics of strong LI value,large CAPE value,low CIN value and high 0℃level height.(3)The con⁃vective clouds triggered by the convergence line moved and developed to the warm zone,forming multiple monomer storms and reaching the vigorous stage in the evening.The first triggered convective cloud cluster reaches the southmost.Under the maintenance of the warm and hu⁃mid unstable airflow in the southwest of the west side of the subtropical high in midsummer,it obtains the most unstable energy and produces the largest hail intensity and widest coverage.(4)The area with combined radar reflectivity higher than 60 dBz and echo top higher than 17 km in multi unit storm is consistent with the place where hail occurs.The vertical structure of the storm shows that the flow field with low-level convergence below 6 km and high-level divergence above 9 km has an obvious suspension structure.

关 键 词：冰雹 地面辐合线 不稳定层结 雷达回波 

分 类 号：P458.121.2[天文地球—大气科学及气象学]