北京地区一次飑线过程的闪电特征及其与水汽条件的关系  

Lightning Characteristics of a Squall Line Process and Its Relationship with Water Vapor Conditions

作　　者：徐燕 刘冬霞[2] 袁善锋 王东方[2] Xu Yan;Liu Dongxia;Yuan Shanfeng;Wang Dongfang(Weather Modification Center of Jiangxi Province,Nanchang 330096,China;Key Laboratory of Middle Atmosphere and Global Environment Observation(LAGEO),Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China)

机构地区：[1]江西省人工影响天气中心,江西南昌330096 [2]中国科学院大气物理研究所,中层大气和全球环境探测重点实验室,北京100029

出　　处：《气象与减灾研究》2022年第1期1-9,共9页Meteorology and Disaster Reduction Research

基　　金：国家自然科学基金项目(编号:41875007)。

摘　　要：利用北京闪电综合探测网(BLNet)的总闪定位和雷达回波资料,分析了2017年8月8日北京地区飑线过程的闪电活动特征,并利用变分多普勒雷达分析系统(VDRAS)反演结果,分析了闪电分布与水汽通量散度的关系。结果表明:1)此次飑线过程的闪电以云闪为主,地闪以负地闪为主,后期正地闪占地闪的比例升高。2)闪电辐射源主要分布在对流区,沿对流线向后部层云区倾斜分布,层云区亮带附近并无辐射源。3)辐射源主要集中在5—10 km高度,其峰值主要出现在6—7 km高度,并且随着对流系统发展、合并辐射源峰值所在高度有所升高,但在对流系统合并后高度有所下降。闪电频数均在每次对流单体开始合并后的18 min达到峰值。4)闪电主要集中在水汽通量辐合区,且辐合强度值越大,闪电越集中。The lightning activity characteristics of a squall line were analyzed by using the location results of total lightning from Beijing Lightning Network(BLNet)and radar data.The relationship between lightning distribution and water vapor flux divergence was analyzed by using the inversion results of Variational Doppler Radar Analysis System(VDRAS).The results showed that:1)The lightning activities generated by the squall line were mainly IC(intra-cloud)lightning flashes;CG(cloud-to-ground flashes)were dominated by NCG(negative CG);The ratio of PCG/CG(positive CG to CG)increased sharply at the dissipation stage.2)The radiation sources were mainly distributed in the convective area,which was inclined to the rear of stratiform along the opposite streamline;no radiation source can be found near the bright band of stratiform.3)The radiation sources were mainly concentrated at the height of 5-10 km,with the maximum distributed over 6-7 km,which increased by the development of convective system and the increased maximum height of radiation source;After the merger,the concentration height of radiation source decreased.The lightning frequency of the two merging processes reached the maximum within 18 minutes after the beginning of the merger.4)Lightning was mainly concentrated in the area where the water vapor flux converged,and the greater the water vapor flux convergence intensity,the more concentrated the lightning.

关 键 词：闪电 飑线 单体合并 水汽条件 

分 类 号：P427.3[天文地球—大气科学及气象学]