DOI: 10.1002/2014JD021842
论文题名: Lightning-initiator type of narrow bipolar events and their subsequent pulse trains
作者: Wu T. ; Yoshida S. ; Ushio T. ; Kawasaki Z. ; Wang D.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 21698996
出版年: 2014
卷: 119, 期: 12 起始页码: 7425
结束页码: 7438
语种: 英语
英文关键词: compact intracloud discharge
; initial breakdown pulse
; lightning initiation
; narrow bipolar event
; preliminary breakdown pulse
Scopus关键词: Electric field effects
; Initial breakdown pulse
; Intracloud discharge
; Lightning initiation
; Narrow bipolar events
; preliminary breakdown pulse
; Lightning
英文摘要: Previous observations show that some narrow bipolar events (NBEs) can initiate intracloud discharges, but the role of NBE as lightning initiation is still unclear. During the summer of 2013, 827 NBEs were detected with a 3-D LF lightning location system in Osaka, Japan. Out of 638 positive NBEs, 103 occurred as the initial events of lightning flashes. These initiator-type NBEs, called "INBEs" in this paper, are always followed by positive pulse trains whose locations show upward propagations probably from the main negative charge region to the upper positive charge region. Most of INBEs develop into intracloud flashes. Only two INBEs develop into positive ground flashes and five INBEs develop into negative ground flashes. Pulse widths and peak amplitudes of electric field change waveforms of INBEs are almost the same as those of normal NBEs. A major difference is that INBEs have much lower discharge heights. Most of INBEs are lower than 10 km while normal NBEs are mainly higher than 10 km. Characteristics of positive pulse trains following INBEs are closely related with discharge heights of INBEs. Higher INBEs are usually followed by weaker, fewer, and less frequent positive pulses with slower upward propagations. As the height increases to above 10 km, NBEs are usually no longer followed by such positive pulses. Key Points A total of 103 out of 827 NBEs initiated lightning flashes. All are positive NBEs Such NBEs are mostly lower than 10 km while other NBEs higher than 10 km Characteristics of discharges following NBEs depend on NBE heights ©2014. 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/63052
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: Division of Electrical, Electronic and Information Engineering, Graduate School of Engineering, Osaka University, Osaka, Japan; Meteorological Research Institute, Ibaraki, Japan; Department of Electrical, Electronic and Computer Engineering, Gifu University, Gifu, Japan
Recommended Citation:
Wu T.,Yoshida S.,Ushio T.,et al. Lightning-initiator type of narrow bipolar events and their subsequent pulse trains[J]. Journal of Geophysical Research: Atmospheres,2014-01-01,119(12)