气候变化领域集成服务门户(CCPortal): Numerical Simulation on the Effects of the Horizontal Charge Distribution on Lightning Types and Behaviors

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DOI	10.1029/2020JD034375
	Numerical Simulation on the Effects of the Horizontal Charge Distribution on Lightning Types and Behaviors
	Xu D.; Tan Y.; Zheng T.; Lin H.; Shi Z.; Lei Y.; Liu M.; Wang H.; Yu J.
发表日期	2021
ISSN	2169-897X
卷号	126 期号:18
英文摘要	Previous studies have generally acknowledged that lightning propagation behaviors and lightning types are closely related to the unbalanced charge amount and vertical stratification of charge structure. In this study, the total charge amount remains nearly balanced (±5%) between the adjacent charge regions where discharges initiate to avoid the interference of a total charge imbalance. Significant influences on the leader propagation tendency and lightning type are revealed by investigating different horizontal charge distribution features emphasizing on the effects of the charge distribution uniformity and the relative position of the high-density charge center. Sensitivity experiments are performed with a two-dimensional stochastic discharge model and demonstrate the following. Under a symmetric charge distribution, the more uniform charge distribution is conducive for leaders propagate horizontally; the charge being more compact in the central zone is favorable for vertical extension of leaders. Under an asymmetric charge distribution, a horizontal shift of high-density charge center is conducive to the extension of leaders in the offset direction. Different charge distributions will change the electrical energy of charge regions resulting in various lightning behaviors. Various charge distributions provide favorable conditions for some lightning flashes (including positive cloud-to-ground flashes [PCG], “bolt-from-the-blue” [BFB] flashes and gigantic jets). PCGs are favorably triggered with the more compact upper positive charge (P) and more uniform middle negative charge (N), and BFB discharges can be triggered between the P and N regions when the high-density charge center in the P region is horizontally shifted. A possible method is provided to explain various lightning behaviors. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	horizontal charge distribution; leader propagation feature; lightning type
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/237003
作者单位	Key Laboratory of Meteorological Disaster, Ministry of Education, Joint International Research Laboratory of Climate and Environment Change, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing, China; State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China; Zhangzhou Meteorological Bureau, Zhangzhou, China
推荐引用方式 GB/T 7714	Xu D.,Tan Y.,Zheng T.,et al. Numerical Simulation on the Effects of the Horizontal Charge Distribution on Lightning Types and Behaviors[J],2021,126(18).
APA	Xu D..,Tan Y..,Zheng T..,Lin H..,Shi Z..,...&Yu J..(2021).Numerical Simulation on the Effects of the Horizontal Charge Distribution on Lightning Types and Behaviors.Journal of Geophysical Research: Atmospheres,126(18).
MLA	Xu D.,et al."Numerical Simulation on the Effects of the Horizontal Charge Distribution on Lightning Types and Behaviors".Journal of Geophysical Research: Atmospheres 126.18(2021).