DOI: 10.1002/jgrd.50508
论文题名: Highly intense lightning over the oceans: Estimated peak currents from global GLD360 observations
作者: Said R.K. ; Cohen M.B. ; Inan U.S.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 13 起始页码: 6905
结束页码: 6915
语种: 英语
英文关键词: lightning over land and ocean
; lightning peak currents
; long-range lightning detection
Scopus关键词: Efficiency
; Geographical distribution
; Lightning
; Cloud-to-ground flash
; Detection efficiency
; Global distribution
; Lightning detection
; Location accuracy
; Negative lightning
; Peak currents
; Validation results
; Ocean currents
; accuracy assessment
; data set
; error analysis
; lightning
; magnitude
; marine environment
; observational method
英文摘要: We present the first global distribution of the average estimated peak currents in negative lightning flashes using 1 year of continuous data from the Vaisala global lightning data set GLD360. The data set, composed of 353 million flashes, was compared with the National Lightning Detection NetworkTM for peak current accuracy, location accuracy, and detection efficiency. The validation results demonstrated a mean (geometric mean) peak current magnitude error of 21% (6%), a median location accuracy of 2.5 km, and a relative ground flash detection efficiency of 57% averaged over all positive and negative reference flashes, and 67% for all reference flashes above 15 kA. The distribution of peak currents for negative flashes shifts to higher magnitudes over the ocean. Three case study 10°×10°regions are analyzed, in which the peak current enhancement is extremely sharp at the coastline, suggesting that the higher peak currents for oceanic lightning cannot be solely attributable to network artifacts such as detection efficiency and peak current estimation error. In these regions, the geometric mean and 95th percentile of the peak current distribution for negative cloud to ocean flashes is 22%-88% and 65%-121% higher, respectively, compared to cloud to ground flashes in nearby land regions. Globally, the majority of all negative flashes with estimated peak current magnitude above 75 kA occur over the ocean. Key Points GLD360 performance is validated against NLDN data using one year of data Global distributions of peak current magnitudes are shown and analyzed On average measured peak currents for negative flashes are higher over the ocean ©2013. American Geophysical Union. All Rights Reserved. 资助项目: HR0011-10-1-0058
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63560
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: Vaisala Inc., Boulder Operations, 194 South Taylor Avenue, Louisville, CO 80027, United States; Department of Electrical Engineering, Stanford University, Stanford, CA, United States; Koc University, Istanbul, Turkey
Recommended Citation:
Said R.K.,Cohen M.B.,Inan U.S.. Highly intense lightning over the oceans: Estimated peak currents from global GLD360 observations[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(13)