On the Transition From Precursors to the Initial Upward Positive Leader in Negative Rocket-Triggered Lightning

doi:10.1029/2020JD033926

	On the Transition From Precursors to the Initial Upward Positive Leader in Negative Rocket-Triggered Lightning
	Li, Xiao 5,6,7; Lu, Gaopeng 1,2,5; Jiang, Rubin 1,6; Zhang, Hongbo 6; Fan, Yanfeng 3; Shi, Tao 7; Qie, Xiushu 1,6; Zhang, Yang 3; Ren, Huan 7; Zhang, Chenxiao 7
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
	2021-09-16
卷号	126
关键词	initial upward positive leader (iUPL) precursor-to-leader transition precursory discharge rocket-and-wire triggered lightning
ISSN号	2169-897X
DOI	10.1029/2020JD033926
通讯作者	Lu, Gaopeng(gaopenglu@gmail.com)
英文摘要	Precursory current pulses (precursors) and initial upward leader pulses are examined to characterize the charge transfer of precursors and the sustained upward leader during the early stage of rocket-triggered lightning. According to the analysis of six negative triggered flashes, it is found that both precursors and the initial upward positive leader (iUPL) pulse are led by a small deflection that appears at about 25 mu s prior to the major pulses. The characteristics of precursors and iUPL pulses are very similar except that the precursors generally transfer less electric charge (35.07 mu C on average) than iUPL pulses do (64.73 mu C on average). Some marginal differences in the parameters (e.g., rise time, duration) may be attributed to the modification of the current pulses caused by the different impedances of the leader channel and the steel wire. The ascending rocket causes the enhancement of electric field (E-field) in the close vicinity of the wire tip, and therefore the breakdown of the iUPL is initiated by a stronger E-field than that of the precursors. The step lengths of the precursors (defined as the extended length of the wire tip lifted by the rocket between two adjacent isolated precursors) are similar to that of iUPL pulses. Our analyses indicate that the transition from precursors to the iUPL occurs when the E-field around the wire tip is strong enough, by the accumulation of more positive charge, to launch a meter-scale breakdown and the ensuing charge transfer to ground.
资助项目	National Key R&D Program of China[2017YFC1501501] ; Natural Science Foundation of China[41875006] ; Natural Science Foundation of China[41905004] ; Natural Science Foundation of China[41775012] ; Natural Science Foundation of China[U1938115] ; Chinese Meridian Project
WOS关键词	CURRENT PULSES ; GROUND-LEVEL ; STAGE ; THUNDERCLOUD ; CORONA ; PROPAGATION ; SYSTEM ; AIR
WOS研究方向	Meteorology & Atmospheric Sciences
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000694671900020
资助机构	National Key R&D Program of China ; Natural Science Foundation of China ; Chinese Meridian Project
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/125349]
专题	中国科学院合肥物质科学研究院
通讯作者	Lu, Gaopeng
作者单位	1.Nanjing Univ Informat Sci & Technol, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Nanjing, Peoples R China 2.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Key Lab Atmospher Opt, HFIPS, Hefei, Peoples R China 3.Chinese Acad Meteorol Sci, State Key Lab Severe Weather, Beijing, Peoples R China 4.Fudan Univ, Inst Atmospher Sci, Dept Atmospher & Ocean Sci, Shanghai, Peoples R China 5.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei, Peoples R China 6.Chinese Acad Sci, Inst Atmospher Phys, Key Lab Middle Atmosphere & Global Environm Obser, Beijing, Peoples R China 7.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Li, Xiao,Lu, Gaopeng,Jiang, Rubin,et al. On the Transition From Precursors to the Initial Upward Positive Leader in Negative Rocket-Triggered Lightning[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2021,126.
APA	Li, Xiao.,Lu, Gaopeng.,Jiang, Rubin.,Zhang, Hongbo.,Fan, Yanfeng.,...&Zhang, Yijun.(2021).On the Transition From Precursors to the Initial Upward Positive Leader in Negative Rocket-Triggered Lightning.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,126.
MLA	Li, Xiao,et al."On the Transition From Precursors to the Initial Upward Positive Leader in Negative Rocket-Triggered Lightning".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 126(2021).