DOI: 10.1002/2017JD027750
Scopus记录号: 2-s2.0-85041724977
论文题名: Anomalous Lightning Behavior During the 26–27 August 2007 Northern Great Plains Severe Weather Event
作者: Logan T.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 3 起始页码: 1771
结束页码: 1784
语种: 英语
英文关键词: aerosol indirect effect
; biomass burning smoke
; deep convection
; positive lightning
英文摘要: Positive polarity lightning strokes can be useful indicators of thunderstorm behavior. A combination of National Lightning Detection Network and Next Generation Radar retrievals is used to analyze the anomalous positive cloud-to-ground (CG) lightning behavior of a rare, late summer severe weather event that occurred on 26–27 August 2007 in the Northern Great Plains region of the United States and southern Canada. Seven discrete supercells (SC1–SC7) exhibiting frequent and intense lightning were responsible for numerous reports of severe weather (e.g., severe hail and 16 tornadoes) including catastrophic damage to the town of Northwood, North Dakota, caused by SC2. Biomass burning smoke from wildfires in Idaho and Montana was present prior to convective initiation. A positive CG lightning stroke rate of nearly 30 strokes per minute was observed 10 min before the EF4 tornado struck Northwood. SC2 was also responsible for all the reports of tornadoes exceeding an EF2 rating. The strongest peak currents (>200 kA) were observed in SC1–SC4 with SC2 having a maximum value of 280 kA. SC2 dominated the statistics of the line of supercells accounting for 27% of all CG lightning strokes. Positive CG lightning accounted for over 40% of all CG lightning strokes in SC4–SC7 on average, and the maximum exceeded 90% in SC6 and SC7. Increasing positive CG lightning dominance was correlated with an increasing northward gradient of smoke aerosol loading in addition to severe weather being reported before the maximum in positive CG lighting stroke rate (SC5 and SC6). This suggests that a complex combination of synoptic forcing and aerosol perturbation likely led to the observed anomalous positive CG lightning behavior in the supercells. ©2018. 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/114482
Appears in Collections: 气候减缓与适应
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作者单位: Department of Atmospheric Sciences, Texas A&M University, College Station, TX, United States
Recommended Citation:
Logan T.. Anomalous Lightning Behavior During the 26–27 August 2007 Northern Great Plains Severe Weather Event[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(3)