doi:  10.3878/j.issn.1006-9895.1910.19134
北京城区相继多次降雹的一次强雷暴的闪电特征

Lightning Activity of a Severe Thunderstorm with Several Hails in Beijing Metropolitan Region
摘要点击 61  全文点击 17  投稿时间:2019-03-26  修订日期:2019-10-16
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基金:  国家自然科学基金,国际(地区)合作与交流项目
中文关键词:  雹暴,闪电活动,辐射源三维定位,雷达回波
英文关键词:  Hailstorm  Lightning  3D-location results of lightning radiation sources  Radar echo
                             
作者中文名作者英文名单位
孙萌宇Sun Mengyu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
郄秀书Qie Xiushu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
Wang DongfangWang Dongfang
Sun LingSun Ling
Yuan ShanfengYuan Shanfeng
Chen ZhixiongChen Zhixiong
Xu WenjingXu Wenjing
Sun ChengyunSun Chengyun
Liu DongxiaLiu Dongxia
Su DebinSu Debin
引用:孙萌宇,郄秀书,Wang Dongfang,Sun Ling,Yuan Shanfeng,Chen Zhixiong,Xu Wenjing,Sun Chengyun,Liu Dongxia,Su Debin.2020.北京城区相继多次降雹的一次强雷暴的闪电特征[J].大气科学
Citation:Sun Mengyu,Qie Xiushu,Wang Dongfang,Sun Ling,Yuan Shanfeng,Chen Zhixiong,Xu Wenjing,Sun Chengyun,Liu Dongxia,Su Debin.2020.Lightning Activity of a Severe Thunderstorm with Several Hails in Beijing Metropolitan Region[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      受东北冷涡和低层暖湿气流影响,2016年6月10日北京城区午后爆发了相继5次降冰雹的一次强烈雷暴天气过程。利用国家“973”项目“雷电重大灾害天气系统的动力-微物理-电过程和成灾机理(雷暴973)” 2016夏季协同观测期间获得的闪电全闪三维定位和多普勒天气雷达等资料,详细分析了此次雹暴的闪电活动和雷达回波特征。此次雹暴过程包括三个孤立的单体相继发展、并合,所分析的4次降雹过程中,总闪电频数在降雹期间都有明显增多,最高可达365 fl/min,云闪占全部闪电的80%以上,其中3次降雹前正地闪出现突增,比例升高,正地闪占全部地闪的比例最高达56%。降雹时雷达回波>45dBZ的面积增大,顶高超过13km。整个雹暴过程,闪电辐射源主要分布在6~10km的高度区域,与强回波具有一致性。全部4次降雹过程均出现明显的闪电频数跃增,并通过2б阈值检验,其中3次提前时间为8-18分钟,说明总闪频数对于降雹过程有一定的预警能力。
Abstract:
      Influenced by the Northeast China cold vortex and warm-moist airflow in low level, a damaging thunderstorm with 5 hail-fall stages took place in Beijing on 10 June 2016. Based on the 3D-location results of total lightning from Beijing Lightning Network (BLNET) and Doppler radar data during the STORM 973 2016 campaign, the characteristics of lightning activity and radar reflectivity structure during this thunderstorm were analyzed. The thunderstorm consisted of three isolated cells triggered in sequence and merged together finally, total lightning frequency increased significantly during the 4 hail-falling stages analyzed, up to 365 fl/min. IC (intra-cloud) lightning flashes accounted for more than 80% of total lightning. The ratio of PCG/CG (positive CG to CG) increased sharply before 3 hail fall stages, up to 56%. During the developments of hailstorm, the area of radar echo greater than 45dBZ increased and echo top exceeded 13km. Lightning radiation sources mainly distributed in the altitude layer from 6 to 10 km throughout the hailstorm process, which was consistent with strong radar echo region. In addition, the total lightning flashes increased dramatically before the 4 analyzed processes, and passed 2б-threshold test. Three of them were 8-18 minutes ahead of the hail-fallings, which shows that the total lightning frequency has a certain early warning ability for hail fall process.
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