WWLLN与江苏省ADTD闪电定位系统数据的对比分析  

Comparison and analysis of lightning characteristics in Jiangsu Province based on data from the Worldwide Lightning Location Network and the Advanced Time of Arrival and Direction System lightning location network

作　　者：崔逊[1] 高金阁[1] 樊荣 

机构地区：[1]南京信息工程大学大气物理学院,江苏南京210044 [2]湖州市气象局,浙江湖州313000

出　　处：《大气科学学报》2016年第2期270-279,共10页Transactions of Atmospheric Sciences

基　　金：国家自然科学基金资助项目(41275009)

摘　　要：利用WWLLN(World-Wide Lightning Location Network,全球闪电定位网)与江苏省ADTD(Active Divectory Topology Diagrammer,活动目录拓扑图)闪电定位系统数据,对2006—2009年江苏省闪电活动年际变化、月际变化、日变化和空间分布、以及探测效率和探测精度等展开研究讨论。结果表明,WWLLN探测的闪电时空分布趋势与ADTD保持较好的一致性:江苏省白天发生的闪电次数略高于晚上;闪电主要集中发生在6—8月,仲夏闪电最为活跃;一天中闪电频次峰值时间段出现在16时(北京时间)左右;江苏省闪电分布呈现明显的地域性,闪电密度高值区位于省内偏西和偏南地区,大致与江苏省经济发达地区的地域分布相吻合。总体上,WWLLN探测到的闪电频次和闪电密度值比ADTD小一个数量级。随着WWLLN全球测站数目的逐年增加以及WWLLN定位技术的升级完善,WWLLN探测效率和探测精度逐步提高。WWLLN探测效率与回击电流极性和强度大小有关联。Thunderstorms are a type of convective weather phenomenon that happen frequently in nature with high intensity. The United Nations Committee for Disaster Reduction has referred to lightning as ＂one of the ten worst natural disasters＂. Jiangsu Province is in the transition zone between the subtropical and warm temperate zones,and is one of the provinces in China most frequently affected by lightning. As a relatively wealthy province in economic terms,the electrical infrastructure（ power grid,electrical equipment etc.） of Jiangsu is also well-developed. Therefore,when lightning-related accidents occur,incalculable harm can be caused not only to personal safety but also socioeconomically.To develop a deeper understanding of the laws governing lightning activities in Jiangsu Province,as well as improve lightning protection and disaster reduction services,the present study set about analyzing the lightning characteristics of the region（ interannual variation,monthly variation and daily variation）,based on data from two sources： the Advanced Time of Arrival and Direction System（ ADTD） and the Worldwide Lightning Location Network（ WWLLN）. The ADTD data were provided by Jiangsu Meteorological Department,whose time zone is Beijing standard time（ BST）. Because the time zone of the WWLLN is Greenwich Mean Time（ GMT）,we converted GMT to Beijing time. The study spanned a period of four years,from 2006 to 2009,throughout contiguous Jiangsu Province. When carrying out the study,the detection efficiency of ADTD was assumed to be 100% because the ADTD data were considered to be the＂ground truth＂,and a time-matching windowof 0. 5 ms was chosen for the lightning location data of WWLLN / ADTD（ i. e.,when lightning observed by WWLLN occurred 0. 5ms before or after that of ADTD,the flash was considered to have been captured by WWLLN）. The WWLLN and ADTD data were then processed and analyzed for the study period.The analysis confirmed that WWLLN favors high peak current return stroke lightning disc

关 键 词：WWLLN ADTD 时空分布 探测效率 探测精度 

分 类 号：P427.3[天文地球—大气科学及气象学]