气候变化领域集成服务门户(CCPortal): On the Transition From Precursors to the Initial Upward Positive Leader in Negative Rocket-Triggered Lightning

CCPortal

DOI	10.1029/2020JD033926
	On the Transition From Precursors to the Initial Upward Positive Leader in Negative Rocket-Triggered Lightning
	Li X.; Lu G.; Jiang R.; Zhang H.; Fan Y.; Shi T.; Qie X.; Zhang Y.; Ren H.; Zhang C.; Zhang Y.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:17
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 μs 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 μC on average) than iUPL pulses do (64.73 μC 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. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	initial upward positive leader (iUPL); precursor-to-leader transition; precursory discharge; rocket-and-wire triggered lightning
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/237019
作者单位	University of Chinese Academy of Sciences, Beijing, China; Key Laboratory of Middle Atmosphere and Global Environment Observation (LAGEO), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, China; Key Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei, China; State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China; Department of Atmospheric and Oceanic Sciences, Institute of Atmospheric Sciences, Fudan University, Shanghai, China
推荐引用方式 GB/T 7714	Li X.,Lu G.,Jiang R.,et al. On the Transition From Precursors to the Initial Upward Positive Leader in Negative Rocket-Triggered Lightning[J],2021,126(17).
APA	Li X..,Lu G..,Jiang R..,Zhang H..,Fan Y..,...&Zhang Y..(2021).On the Transition From Precursors to the Initial Upward Positive Leader in Negative Rocket-Triggered Lightning.Journal of Geophysical Research: Atmospheres,126(17).
MLA	Li X.,et al."On the Transition From Precursors to the Initial Upward Positive Leader in Negative Rocket-Triggered Lightning".Journal of Geophysical Research: Atmospheres 126.17(2021).