飑线系统中的闪电活动与雷达回波特征的相关性研究  

Relationship between Lightning Activities and Radar Echoes of Squall Line Convective Systems

作　　者：于函 张鸿波[2] 刘冬霞[2] 陈志雄 田野 袁善锋 王东方[2] 卢晶雨 周筠珺[1] 郄秀书[2,3] Han YU;Hongbo ZHANG;Dongxia LIU;Zhixiong CHEN;Ye TIAN;Shanfeng YUAN;Dongfang WANG;Jingyu LU;Yunjun ZHOU;Xiushu QIE(School of Atmosphere Science,Chengdu University of Information Technology,Chengdu 610225;Key Laboratory of Middle Atmosphere and Global Environment Observation,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029;University of Chinese Academy of Sciences,Beijing 100049;School of Geographical Sciences,Fujian Normal University,Fuzhou 350007;Institute of Urban Meteorology,China Meteorological Administration,Beijing 100089;Meteorological Observation Centre,Beijing Meteorological Bureau,Beijing 100081)

机构地区：[1]成都信息工程大学大气科学学院,成都610225 [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(LAGEO),北京100029 [3]福建师范大学地理科学学院,福州350007 [4]中国气象局北京城市气象研究院,北京100089 [5]北京市气象局气象探测中心,北京100081 [6]中国科学院大学地球与行星科学学院,北京100049

出　　处：《大气科学》2022年第4期835-844,共10页Chinese Journal of Atmospheric Sciences

基　　金：国家自然科学基金项目41630425、41805004、41875007;国际(地区)合作与交流项目41761144074。

摘　　要：基于北京宽频带闪电网(Beijing Broadband Lightning Network,简称BLNet)获得的全闪三维定位和多普勒天气雷达等资料,详细分析了2015~2017年北京暖季7次强飑线过程的闪电活动与雷达回波强度之间的关系。结果表明,闪电主要发生于前部线状对流云区内且集中分布在30 d BZ以上的强回波区域,少部分的闪电分布在后部的层状云区域内。从闪电辐射源三维分布结构可以发现,闪电活动大部分处在6~11 km的高度范围。将能够同时反映强回波深度和面积的0~-30°C温度区域内大于30 d BZ雷达回波体积(V)作为强回波指标,并与闪电活动进行统计分析发现,整体上在7次飑线过程中,总闪频数和V存在较好的相关性,其中5次过程的闪电频数峰值同时或提前于V的峰值出现,二者的时滞相关系数超过0.61,提前时间为0~96 min。另外两次过程中闪电峰值落后于V峰值,落后时间分别为30 min和60 min。研究结果不仅对认识闪电与对流活动的关系有重要的科学意义,也可为闪电资料在数值模式中的同化应用提供科学依据。The relationships between the lightning activities and the radar reflectivity intensities of seven severe squall lines, which occurred in Beijing from 2015 to 2017, were analyzed. The analysis was done based on three-dimensional lightning location data from Beijing Broadband Lightning Network(BLNet) and the S-band Doppler radar. The results show that lightning flashes are mainly located in the convective leading line and centered in the strong echo region, with reflectivity greater than 30 dBZ, and a small part of lightning flashes distributed in the trailing stratiform region. Based on the three-dimensional lightning structure, the lightning flashes are mostly concentrated in the range of 6–11 km height layer. Using the radar echo volume with reflectivity >30 dBZ(V30dBZ) between the 0 and-30°C level, as a strong convection index to reflect both the depth and area of strong convection, we found that of all seven squall lines, the trend of the lightning frequency and V30dBZ evolution showed some relationship. For five squall lines, the lightning frequency peak is the same or earlier than that of V30dBZ, the lagged correlation coefficient is higher than 0.61, and the lightning frequency is earlier than V30dBZ, with a leading time from 0 to 96 min. For the other two cases, the lightning frequency peak lags V30dBZ at 30 and 60 min, respectively. The results are significant for understanding lightning activity and convection intensification and provide a scientific basis for lightning data assimilation in numerical weather prediction.

关 键 词：飑线 闪电活动 大于30 dBZ雷达回波体积 滞后相关 

分 类 号：P446[天文地球—大气科学及气象学]