DOI: 10.1002/jgrd.50660
论文题名: Correlated lightning mapping array and radar observations of the initial stages of three sequentially triggered Florida lightning discharges
作者: Hill J.D. ; Pilkey J. ; Uman M.A. ; Jordan D.M. ; Rison W. ; Krebhiel P.R. ; I Biggerstaff M. ; Hyland P. ; Blakeslee R.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 15 起始页码: 8460
结束页码: 8481
语种: 英语
英文关键词: lightning
Scopus关键词: Melting
; Radar
; Rockets
; Stages
; Wire
; Cloud-to-ground discharge
; Electrical current
; Intracloud discharge
; Lightning discharge
; Lightning mapping array
; Precipitation gradients
; Radar observations
; Triggered lightning
; Lightning
; altitude
; cloud to ground lightning
; convective system
; magnetic reversal
; precipitation (climatology)
; radar imagery
; thunderstorm
; Florida [United States]
; United States
英文摘要: Correlated Lightning Mapping Array and vertical-scan radar images are presented for three rocket-and-wire triggered lightning flashes that occurred sequentially within 17 min in the presence of a decaying multicellular convective storm system over north-central Florida. The initial stage (IS) of each flash propagated generally vertically to the altitude of the 0°C melting level, about 5 km, and then subsequently propagated for many kilometers horizontally along the melting level contour. Radar images suggest that the propagation paths of the IS channels below and above the melting level were heavily influenced by precipitation gradients. Flash UF 11-24 exhibited a 12.6 km unbranched IS channel, the longest unbranched channel observed in the study by a factor of three. During flash UF 11-25 (119 ms following the cessation of the measured IS current at ground and prior to the first return stroke), a natural cloud-to-ground discharge, perhaps induced by the IS, initiated between 2.5 and 4 km altitude and struck ground 5 to 7 km from the launching facility. The IS of flash UF 11-26 propagated upward through a descending precipitation packet and apparently induced a naturally appearing bi-level intracloud discharge via an upward-negative leader that initiated within the IS breakdown region 3.5 km from the launching facility. The upward-negative leader propagated from 5.6 to 9.3 km altitude in a time of 11 ms. The electrical current measured at ground during the IS of flash UF 11-26 exhibited a 57 ms polarity reversal, transferring 19 C of positive charge to ground. Key Points Correlated LMA and vertical-scan radar images of Florida triggered lightning Correlation of IS breakdown path with radar-determined precipitation gradients Rocket-and-wire triggering of a naturally appearing bi-level IC discharge ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63452
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Electrical and Computer Engineering, University of Florida, 311 Larsen Hall, PO Box 116200, Gainesville, FL 32611, United States; Stinger Ghaffarian Technologies, Kennedy Space Center, FL, United States; Electrical Engineering Department, Physics Department, New Mexico Institute of Mining and Technology, Socorro NM, United States; School of Meteorology, University of Oklahoma, Norman OK, United States; NASA Marshall Space Flight Center, Huntsville AL, United States
Recommended Citation:
Hill J.D.,Pilkey J.,Uman M.A.,et al. Correlated lightning mapping array and radar observations of the initial stages of three sequentially triggered Florida lightning discharges[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(15)