| 摘要: |
| 基于全球闪电定位网 (World Wide Lightning Location Network，WWLLN) 获取的闪电定位资料对江淮闪电定位网 (Jianghuai Area Sferic Array，JASA) 在内陆及近海区域的闪电实时探测性能进行评估。通过对2019年第9号超强台风“利奇马”期间产生的闪电活动进行对比分析，发现JASA和WWLLN对台风闪电的径向分布、时间变化和空间变化有较好的一致性，绝大部分闪电发生在云顶亮温小于220 K区域；在台风发展阶段，内核区闪电活动较为频繁，在台风成熟和消亡阶段时，闪电主要分布外雨带，内核区的闪电活动少但集中。在探测效率方面，JASA对江淮区域实时定位到的闪电数远多于WWLLN，相对探测效率和绝对探测效率分别为69.12%和92.51%。而在海洋区域 (114~130 °E，20~24 °N和123~130 °E，24~32 °N)，由于受到JASA站点位置分布的限制，闪电实时定位数略少于WWLLN，其相对探测效率和绝对探测效率分别为32.67%和 52.26%。研究结果表明了JASA对内陆及近海区域雷暴具备较强的捕获能力，为实时监测台风期间强对流闪电活动的演变规律提供数据支撑，也为进一步完善站点布局以提升深海区域闪电探测性能提供了理论支撑。 |
| 关键词: 江淮闪电定位网 探测效率 全球闪电定位网 台风“利奇马” 台风闪电 |
| DOI：10.16032/j.issn.1004-4965.2023.012 |
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| EVALUATE THE DETECTION EFFICIENCY OF JIANGHUAI AREA SFERIC ARRAY BASED ON THE WORLD WIDE LIGHTNING LOCATION NETWORK: A CASE STUDY OF TYPHOON LEKIMA |
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ZHENG Jiayi,LU Gaopeng,LIU Feifan,REN Huan,PENG Kangming,WANG Yongpin,ZHU Baoyou
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1. University of Science and Technology of China, Hefei 230026, China.2. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing 210044, China.3. Key Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China.;2.0
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| Abstract: |
| Based on the lightning location data obtained by the World Wide Lightning Location Network (WWLLN), this study evaluates the real-time lightning detection performance of the Jianghuai Area Sferic Array (JASA) in inland and marine areas. A comparative analysis of the lightning activity during the visit of super typhoon Lekima (1909) showed that JASA and WWLLN had good consistency in radial distribution, temporal and spatial changes of typhoon-related lightning, and most of the lightning occurred where the cloud-top brightness temperature is less than 220 K. During the development stage of the typhoon, lightning activities in the inner core area were more frequent. When the typhoon matured and disappeared, lightning was mainly distributed in the outer rainband, and lightning activities in the inner core area were few but concentrated. In terms of detection efficiency, JASA's real-time location of lightning in the Jianghuai area was much more than WWLLN’s, and its relative detection efficiency and absolute detection efficiency were 69.12% and 92.51%, respectively. In the marine area (114~130?°E，20~24?°N and 123~130 °E，24~32 °N), due to the limitation of JASA site layout, the real-time positioning number of lightning was slightly less than that of WWLLN, and its relative detection efficiency and absolute detection efficiency were 32.67% and 52.26%, respectively. The results show that JASA has a strong ability to capture inland and offshore thunderstorms, and provides data support for real-time monitoring of the evolution of strong convective lightning activities during typhoons’visits. Our analysis also provides a theoretical basis for further improving the site layout and support for improving the lightning detection performance in the open sea. |
| Key words: Jianghuai Area Sferic Array (JASA) detection efficiency World Wide Lightning Location Network (WWLLN) Typhoon Lekima lightning activity of typhoon |
