DOI: 10.1002/2017JD027569
Scopus记录号: 2-s2.0-85048977362
论文题名: Investigation of Lightning Flash Locations in Isolated Convection Using LMA Observations
作者: Fuchs B.R. ; Rutledge S.A.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 11 起始页码: 6158
结束页码: 6174
语种: 英语
英文关键词: atmospheric chemistry
; lightning
; microphysics
; satellite detection
Scopus关键词: array
; atmospheric chemistry
; convection
; lightning
; radar
; reflectivity
; satellite data
; storm
; Alabama
; Colorado
; District of Columbia
; Oklahoma [United States]
; United States
; Washington [District of Columbia]
英文摘要: Using Lightning Mapping Arrays (LMAs), lightning flash locations in three dimensions have been investigated using multiple methods. Approximately 500,000 flashes were analyzed to reveal the variability of lightning initiation and propagation within convective storms. These flashes were produced by over 4,000 isolated convective storms during one warm season across diverse weather regimes in northern Alabama, Washington, D.C., central Oklahoma, and northeastern Colorado. Lightning locations are analyzed within the context of radar reflectivities and examined for vertical variability. Results show that storms in Colorado preferentially produced flashes at lower altitudes and in regions of higher reflectivity compared to the other regions. The regional differences in flash altitudes are largely attributed to the prevalence of anomalous polarity storms (middle- or low-level dominant positive charge) in Colorado, as anomalous storms produced a majority of flashes at lower altitudes compared to storms with normal polarity charge structures (middle-level negative charge). Conversely, anomalous storms are exceedingly rare in the other regions of study. The differences in flash altitudes are coincident with discrepancies between annual average densities estimated by satellite observations and LMA. Specifically, large differences in annual average flash density estimates exist in northeastern Colorado, which are not present in the other regions, suggesting that the lower altitude flashes in Colorado may be more difficult to detect by satellites. ©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/113707
Appears in Collections: 气候减缓与适应
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作者单位: Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States
Recommended Citation:
Fuchs B.R.,Rutledge S.A.. Investigation of Lightning Flash Locations in Isolated Convection Using LMA Observations[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(11)