气候变化领域集成服务门户(CCPortal): Leader Charges, Currents, Ambient Electric Fields, and Space Charges Along Downward Positive Leader Paths Retrieved From Ground Measurements in Metropolis

CCPortal

DOI	10.1029/2020JD032818
	Leader Charges, Currents, Ambient Electric Fields, and Space Charges Along Downward Positive Leader Paths Retrieved From Ground Measurements in Metropolis
	Gao Y.; Chen M.; Lyu W.; Qi Q.; Qin Z.; Du Y.-P.; Zhang Y.
发表日期	2020
ISSN	2169897X
卷号	125 期号:19
英文摘要	An approach for retrieving the leader channel charge density, leader current, ambient electric field, and space charge along a leader channel path from ground observations with a complicated ground condition was presented. With this approach, properties of two downward positive leaders (DPL1 and DPL2) struck at high-rise buildings were studied based on electric and optical measurements made on the roof of a 100 m high building in Guangzhou, China. It shows that the leader-produced electric field on the roof of the 100 m high building was about 4 times of that on flat ground. The 2-D speed for both leaders showed a general increasing trend as the leader going down, in the range of 1.8 to 32.3 × 105 and 1.7 to 46.9 × 105 m/s, respectively. The channel line charge density for both leaders showed firstly a sharp increasing trend and then a decreasing trend as the leader going down, in the range of 0.4 to 8.6 and 0.4 to 15.2 mC/m, respectively. The current of the two leaders varied in the range of 0.7 to 5.4 and 0.7 to 4.6 kA, respectively. The ambient electric field (downward is positive) for both leaders showed an alternating polarity along the leader path, in the range of −120 to +176 and −250 to +180 kV/m, respectively. The space charge for both leaders showed also an alternating polarity along the leader path, in the range of −12.3 to +4.2 and −13.9 to +7.8 nC/m3, respectively, which may reflect the in-cloud electric structure and the corona charge distribution between the cloud and ground. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	ambient electric field; downward positive leader; leader channel charge; space charge
语种	英语
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/185707
作者单位	Department of Building Service Engineering, The Hong Kong Polytechnic University, Hong Kong; Guangdong-Hong Kong-Macao Greater Bay Area Weather Research Center for Monitoring Warning and Forecasting (Shenzhen Institute of Meteorological Innovation), Shenzhen, China; State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China; Laboratory of Lightning Physics and Protection Engineering, Chinese Academy of Meteorological Sciences, Beijing, China; Institute of Atmospheric Sciences, Fudan University, Shanghai, China
推荐引用方式 GB/T 7714	Gao Y.,Chen M.,Lyu W.,et al. Leader Charges, Currents, Ambient Electric Fields, and Space Charges Along Downward Positive Leader Paths Retrieved From Ground Measurements in Metropolis[J],2020,125(19).
APA	Gao Y..,Chen M..,Lyu W..,Qi Q..,Qin Z..,...&Zhang Y..(2020).Leader Charges, Currents, Ambient Electric Fields, and Space Charges Along Downward Positive Leader Paths Retrieved From Ground Measurements in Metropolis.Journal of Geophysical Research: Atmospheres,125(19).
MLA	Gao Y.,et al."Leader Charges, Currents, Ambient Electric Fields, and Space Charges Along Downward Positive Leader Paths Retrieved From Ground Measurements in Metropolis".Journal of Geophysical Research: Atmospheres 125.19(2020).