气候变化领域集成服务门户(CCPortal): Three-dimensional mapping of two coincident flashes - An upward positive flash triggered by the in-cloud activity of a downward negative flash

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DOI	10.1016/j.atmosres.2020.105408
	Three-dimensional mapping of two coincident flashes - An upward positive flash triggered by the in-cloud activity of a downward negative flash
	Lyu F.; Cummer S.A.; Chen M.; Qin Z.; Lyu W.; Sun J.
发表日期	2021
ISSN	0169-8095
卷号	250
英文摘要	Lightning mapping with radio frequency location systems plays a more and more important role in understanding the mechanism of lightning discharges during thunderstorms. Here we present a comprehensive analysis of the electromagnetic field measurements and 3-dimensional (3D) mapping of two coincident lightning flashes: an upward positive flash (+CG) with long preceding upward negative leader (UNL), which was triggered by the in-cloud (IC) activity of a nearby downward negative flash (−CG). The flashes were mapped with a low frequency (LF) mapping array deployed near Duke University and during a late-spring thunderstorm passing a plain area. The 3D LF maps show that the IC activity related to the −CG moved negative charge away from the location overhead the UNL. The UNL developed firstly upward for about 2 km and then extended horizontally for about 8 km at that height with a mean speed of 6.2 × 105 m/s. The channel line charge density of the UNL was estimated to range from −542 μC/m to −9.21 mC/m with a mean value of −3.46 mC/m. The total positive charge transferred from the cloud to ground by the +CG flash was estimated to be about 5.8C. From the 3D maps, we inferred that the IC activity relating to the −CG flash which moved negative charge away from overhead region of the UNL could be responsible for the UNL initiation. And the existence of extensive lower positive charges further favored the long horizontal propagation of the UNL inside the cloud. © 2020
英文关键词	Lightning 3D mapping; Line charge density; Lower positive charge region; Triggered lightning discharge; Upward negative leader; Upward positive flash
语种	英语
scopus关键词	Electromagnetic field measurement; Electromagnetic fields; Lightning; Thunderstorms; Comprehensive analysis; Lightning discharge; Lightning flashes; Location systems; Negative flashes; Positive charges; Radio frequencies; Three dimensional mapping; Mapping; cloud to ground lightning; electromagnetic field; frequency analysis; mapping method; three-dimensional modeling; thunderstorm
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/162156
作者单位	Nanjing Joint Institute for Atmospheric Sciences, Chinese Academy of Meteorological Sciences, Nanjing, China; State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China; Department of Building Services Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong; Electrical and Computer Engineering Department, Duke University, Durham, NC, United States; Guangdong-Hong Kong-Macao Greater Bay Area Weather Research Center for Monitoring Warning and Forecasting (Shenzhen Institute of Meteorological Innovation), Shenzhen, China
推荐引用方式 GB/T 7714	Lyu F.,Cummer S.A.,Chen M.,et al. Three-dimensional mapping of two coincident flashes - An upward positive flash triggered by the in-cloud activity of a downward negative flash[J],2021,250.
APA	Lyu F.,Cummer S.A.,Chen M.,Qin Z.,Lyu W.,&Sun J..(2021).Three-dimensional mapping of two coincident flashes - An upward positive flash triggered by the in-cloud activity of a downward negative flash.Atmospheric Research,250.
MLA	Lyu F.,et al."Three-dimensional mapping of two coincident flashes - An upward positive flash triggered by the in-cloud activity of a downward negative flash".Atmospheric Research 250(2021).