DOI: 10.1002/2016GL068924
论文题名: Stroke multiplicity and horizontal scale of negative charge regions in thunderclouds
作者: Williams E.R. ; Mattos E.V. ; Machado L.A.T.
刊名: Geophysical Research Letters
ISSN: 0094-9550
EISSN: 1944-9281
出版年: 2016
卷: 43, 期: 10 起始页码: 5460
结束页码: 5466
语种: 英语
英文关键词: cloud-to-ground lightning
; first radar echo
; incipient thunderstorms
; intracloud lightning
; lightning location system
; stroke multiplicity
Scopus关键词: Lightning
; Lightning protection
; Radar
; Space-based radar
; Thunderstorms
; Tracking radar
; Cloud-to-ground lightning
; Intracloud
; Lightning location systems
; Radar echoes
; stroke multiplicity
; Clouds
; atmospheric electricity
; cloud to ground lightning
; electrical property
; energy balance
; environmental impact
; radar interferometry
; thundercloud
; Brazil
英文摘要: An X-band polarimetric radar and multiple lightning detection systems are used to document the initial cloud-to-ground lightning flash in a large number (46 cases) of incipient thunderstorms, as part of the CHUVA-Vale field campaign during the 2011/2012 spring-summer in southeast Brazil. The results show an exceptionally low stroke multiplicity (87% of flashes with single stroke) in the initial ground flashes, a finding consistent with the limited space available for the positive leader extension into new regions of negative space charge in compact cells. The results here are contrasted with the behavior of ground flashes in mesoscale thunderstorms in previous studies. Additionally, we found evidence for a minimum scale (radar echo >20 dBZ) for lightning initiation (>3 km in radius) and that the peak currents of initial cloud-to-ground flashes in these compact thunderstorms are only half as large as return stroke peak currents in general. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84978915469&doi=10.1002%2f2016GL068924&partnerID=40&md5=723a76e6276ec1e7919201d04cbf6ac2
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10513
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Massachusetts Institute of Technology-Parsons Laboratory, Cambridge, MA, United States
Recommended Citation:
Williams E.R.,Mattos E.V.,Machado L.A.T.. Stroke multiplicity and horizontal scale of negative charge regions in thunderclouds[J]. Geophysical Research Letters,2016-01-01,43(10).