DOI: 10.1002/2013JD020093
论文题名: Characteristics of positive cloud-to-ground lightning in da Hinggan Ling forest region at relatively high latitude, northeastern China
作者: Qie X. ; Wang Z. ; Wang D. ; Liu M.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 24 起始页码: 13393
结束页码: 13404
语种: 英语
英文关键词: continuing current
; physical characteristics
; positive cloud-to-ground lightning
; preliminary breakdown pulses
; return stroke
Scopus关键词: Electric fields
; Cloud-to-ground lightning
; Continuing current
; Physical characteristics
; preliminary breakdown pulses
; Return stroke
; Forestry
; cloud to ground lightning
; discharge
; electrical method
; latitude
; measurement method
; China
英文摘要: In 2009 and 2010, a multistation network of fast and slow antennas was installed on the edge of a relatively high latitude forest region in Da Hinggan Ling (50.4°N, 124.1°E) of northeastern China. The documented 185 positive cloud-to-ground (CG) flashes containing 196 return strokes were analyzed in the paper. It was found that 71.89% of the positive CG flashes contained continuing current. The average duration of continuing current was short with an arithmetic mean value of 33.29 ms and a geometric mean value of 16.74 ms; only one continuing current lasted longer than 150 ms, probably because of the small size of the storm cell in this relatively high latitude region. The vast majority (94.59%) of positive CG flashes was characterized by a single stroke, and the average number of stroke per flash is 1.06. The average charge transferred by positive stroke and continuing current, based upon the analysis of five flashes with well-documented simultaneous measurements of more than five stations, was +5.2 C from a height of 6.0 km (above ground) and +10.2 C from a height of 6.4 km, respectively. The charge moment for +CG strokes ranged from +13.7 C km to +55.9 C km, while that for continuing current ranged from +29.0 C km to +96.9 C km, respectively. The preliminary breakdown process in positive CG flashes can be classified into three types, namely type S (same), type D (different), and type C (chaotic) according to the disparities in the initial polarity of bipolar pulses from the return stroke, which account for 62.92%, 23.60%, and 13.48%, respectively. According to the electric field waveforms indicative (or not indicative) of intracloud (IC) discharge, positive CG flashes are classified into four types, i.e., ordinary positive CG flash (63.78%), hybrid +CG-IC flash (21.08%), hybrid IC-+CG flash (5.41%), and hybrid IC-+CG-IC flash (9.73%). About 15.14% of the recorded positive CG flashes were byproduct of IC lightning discharge. Key Points 185 +CG were documented in a higher-latitude forest region The duration of continuing current was averagely short Four +CG types were summarized by waveforms accompanying (or not) with IC discharge ©2013. American Geophysical Union. All Rights Reserved. 资助项目: 40930949
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63077
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: Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, 40 Huayanli, Qijiahuozi, Chaoyang District, Beijing 100029, China; Institute of Atmospheric Physics, University of Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Qie X.,Wang Z.,Wang D.,et al. Characteristics of positive cloud-to-ground lightning in da Hinggan Ling forest region at relatively high latitude, northeastern China[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(24)