韩颂雨,郑栋,张义军,罗昌荣. 2020. 包含三次降雹的雹暴过程地闪活动特征分析[J]. 气象学报, (0):-, doi:10.11676/qxxb2020.012
包含三次降雹的雹暴过程地闪活动特征分析
Characteristic analysis of cloud-to-ground lightning activity during hailstorm process with three hail falling events
投稿时间:2019-06-12  修订日期:2019-08-01
DOI:10.11676/qxxb2020.012
中文关键词:  冰雹,雹暴地闪,地闪频次,双雷达风场反演,垂直速度
英文关键词:Hail,CG lightning of hailstorm,CG lightning flash rate,Dual-Doppler radar retrieval,Vertical velocity
基金项目:国家自然科学基金(41875001,41675005)
作者单位E-mail
韩颂雨 浙江省气象信息网络中心 514884835@qq.com 
郑栋 中国气象科学研究院灾害天气国家重点实验室 zhd@cams.cma.gov.cn 
张义军 复旦大学大气与海洋科学系/大气科学研究院 zhangyijun@fudan.edu.cn 
罗昌荣 海峡气象开放实验室 luo323@sina.com 
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中文摘要:
      为研究雹暴的地闪活动特征,利用地闪资料与三组双雷达反演的风场,对包含三次降雹的一次雹暴过程的地闪活动特征及其与雹暴动力、微物理条件之间的关系进行了分析与讨论。主要结果为:1)整个雹暴过程中发生了三次持续降雹事件,并伴随着三次地闪活动出现峰值,在降雹前地闪频次均有跃增现象。在降雹开始后,地闪频次均迅速减少。2)整个雹暴过程中对应地闪位置的0℃层、-20℃层高度的垂直速度范围分别集中在-2~2m/s和-10~10m/s的区域。但三次降雹时段的地闪位置分别对应在-20℃层高度的强下沉气流区附近,强上升与下沉气流区的交界区和弱的下沉气流区。3)选取的雹暴内最大反射率、-20℃层高度最大反射率、-20℃层高度大于40dBz个数三个雷达回波参量与地闪频次变化趋势一致,其相关系数分别为0.64、0.64、0.76。选取的对应地闪位置-20℃层高度的最大垂直速度绝对值、-20℃层高度以上垂直速度绝对值大于5m/s的体积数两个垂直速度参量与地闪频次成正比关系,且阶段最大值与地闪频次阶段最大值相对应,相关系数分别为0.72、0.65。综合考虑动力和微物理影响的可降冰质量通量这一参量与地闪频次的相关性最为显著,相关系数达0.85。整个雹暴过程发展最为全盛的第二次降雹阶段的地闪频次较低,推测强动力过程作用下的电荷结构特征不利于地闪发生。但动力过程在整个雹暴过程中具有正向支配作用,上升气流变化超前于冰晶质量和闪电频次变化,影响着雷达回波变化。
英文摘要:
      The cloud-to-ground(CG)lightning activity characteristics of hailstorms is an important issue.Based on the CG lightning data and the wind fields retrieved by three groups of dual-Doppler radar,the characteristics of CG lightning activity in a hailstorm process including three hail falling events and its relationship with hailstorm dynamics and microphysical conditions were analyzed and discussed. The results reveal that: 1) Three continuous hail falling occurred during the whole hailstorm process, with three peaks of CG lightning activity, and CG lightning flash rate increased rapidly prior to hail falling. After the hail falling began,the CG lightning flash rate decreased rapidly. 2) During the whole hailstorm process,the vertical velocity ranges at 0℃、-20℃ level corresponding to CG lightning position are concentrated in the areas of -2~2m/s and -10~10m/s, respectively. However, CG lightning position during the three hail falling periods respectively corresponding to the strong subsidence airflow zone nearby,the boundary area between strong rising and subsidence airflow zone and weak subsidence airflow zone at -20℃ level.3)The maximum reflectivity in hailstorm、the maximum reflectivity at -20℃ level、the numbers of greater than 40dBz at -20℃ level,this three radar echo parameters have the same trend as the CG lightning flash rate, and their correlation coefficients are 0.64, 0.64 and 0.76, respectively. The maximum vertical velocity absolute value at -20℃ level corresponding to CG lightning position,and the volume number of the vertical velocity absolute value greater than 5m/s above -20℃ level,this two vertical velocity parameters are proportional to the CG lightning flash rate, their correlation coefficients are 0.72 and 0.65 respectively,and the parameters maximum value of the stage corresponds to the CG lightning flash rate maximum value of the stage.Considering the dynamic and microphysical effects,the precipitation ice mass flux,this parameter has the most significant correlation with the CG lightning flash rate, and their correlation coefficient is 0.85.The CG lightning flash rate of the second hail falling stage which developed most flourishingly during hailstorm is low, it is inferred that the characteristics of charge structure under strong dynamic process is not conducive to the occurrence of the CG lightning.However, the dynamic process has a positive dominant role in the whole hailstorm process,the updraft changes ahead of the ice crystal mass and lightning rate , and affects the radar echo changes.
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