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华北一次中尺度对流系统中的闪电活动特征及其与雷暴动力过程的关系研究
引用本文:刘冬霞,郄秀书,冯桂力.华北一次中尺度对流系统中的闪电活动特征及其与雷暴动力过程的关系研究[J].大气科学,2010,34(1):95-104.
作者姓名:刘冬霞  郄秀书  冯桂力
作者单位:中国科学院大气物理研究所中层大气与全球环境探测重点实验室,北京,100029;山东省雷电防护与技术中心,济南,250031
基金项目:中国科学院“百人计划”专项经费;;国家自然科学基金资助项目40505001、40930949
摘    要:利用地面地闪定位资料、多普勒天气雷达和常规气象资料, 分析了一次具有前部对流线和后部大范围层状云降水(LLTS)的典型中尺度对流系统(MCS)的闪电活动演变特征。整个MCS生命史中负地闪占主导地位, 正地闪则表现不活跃。观测得到MCS消散阶段云闪与地闪的比例为2∶1, 地闪主要分布在地面相对位温和对流不稳定能量均达到高值的区域; 负地闪主要密集地分布在大于40 dBZ的回波范围内; 正地闪则稀疏地分布在30~40 dBZ的回波范围内。在低于-40℃的温度区域内地闪分布较多, 而密集的地闪分布在温度梯度大的区域内。结合单多普勒雷达的水平风场反演, 发现地闪集中出现在气流表现为气旋性切变或水平风呈现切变的区域。该区域与MCS的强回波区相对应, 并且地闪易发生在上升气流达到最大并开始出现下沉气流的阶段。

关 键 词:地闪  水平风场  雷达回波  云顶亮温  中尺度对流系统

Evolution Characteristics of the Lightning and the Relation with Dynamical Structure in a Mesoscale Convective System over North China
LIU Dongxi,QIE Xiushu and FENG Guili.Evolution Characteristics of the Lightning and the Relation with Dynamical Structure in a Mesoscale Convective System over North China[J].Chinese Journal of Atmospheric Sciences,2010,34(1):95-104.
Authors:LIU Dongxi  QIE Xiushu and FENG Guili
Affiliation:1.Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Science, Beijing, 1000292.Shandong Lightning Protection and Technology Center, Ji'nan, 250031
Abstract:Based on the lightning location detection data,Doppler radar data,and synoptic information,this paper presents the lightning characteristics of a typical mesoscale convective system(MCS)in the north of Shandong Province on 1 August 2005.It is found that the negative cloud-to-ground(-CG)lightning is predominant over the positive cloud-to-ground(+CG)lightning during the whole thunderstorm lifetime.At the dissipation stage,IC(intracloud lightning)/CG is 2:1 within the detection range.And when the electric field changed greatly,the lightning happened frequently.The CG lightning mainly occurred in the regions with high values of convective available potential energy(CAPE)and surface equivalent potential temperature.The comparison between the location of lightning activity and radar echo shows that-CG usually clusters in the intense echo region with high reflectivity(>40 dRZ),while +CG usually disperse in the weak echo(30 dBZ-40 dBZ)regioa Relation between the cloud-top brightness temperature and the CG lightning location indicates that most flashes occurred in the area with temperature lower than-40℃,while the +CG lightning clustered in the region with the cloud-top temperature between-40℃ and -50℃.The comparison between the wind field retrieved from Doppler radar and the location of CG flashes indicates that the flashes are usually located in the cyclonic shear or wind shear areas which corresponds to the intense echo.The CG flashes are easier to happen in the stage that updraft reaches the maximum and downdraft appears.
Keywords:cloud-to-ground lightning  wind field  radar echo  mesoscale convective system  cloud-top brightness temperature  
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