气候变化领域集成服务门户(CCPortal): Evaluating Geostationary Lightning Mapper Flash Rates Within Intense Convective Storms

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DOI	10.1029/2020JD032827
	Evaluating Geostationary Lightning Mapper Flash Rates Within Intense Convective Storms
	Rutledge S.A.; Hilburn K.A.; Clayton A.; Fuchs B.; Miller S.D.
发表日期	2020
ISSN	2169897X
卷号	125 期号:14
英文摘要	The Geostationary Lightning Mapper (GLM) marks the first time that lightning observations at storm-scale resolution are operationally available from geostationary orbit. We evaluate GLM detection efficiency (DE) for a special class of convective storms characterized by anomalous charge structures. These storms are anomalous as their internal layered charge structure departs from the tripole charge structure model, where midlevel negative charge is situated between upper and lower positive charge layers. Anomalous storms are characterized by extreme flash rates, low median flash heights, and intense precipitation. Ground truth information on lightning flash rates is provided by Lightning Mapping Arrays (LMA), which measure VHF radio frequency emissions produced by electrical breakdown. This study contrasts two regions: Colorado, where electrically “anomalous” storms are numerous, and Alabama, where they are rare. This study analyzes GLM DE as a function of the precipitation water path, cloud water path, and lightning properties from LMA. The GLM DE is found to vary with the geometric size of the flash and with cloud water path, the latter depending on flash height and cloud water content. Optical scattering (attenuation) by precipitation-sized particles does not appear to be a factor since precipitation particles contain much less surface area than cloud particles. The size of the flash is correlated with its optical brightness, and the cloud water path is correlated with optical extinction. Regional differences in GLM DE remain that appear to be related to sensor viewing geometry and day versus night sensitivity differences. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	lightning; validation
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185901
作者单位	Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States; Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO, United States; WeatherFlow, Inc., Scotts Valley, CA, United States
推荐引用方式 GB/T 7714	Rutledge S.A.,Hilburn K.A.,Clayton A.,et al. Evaluating Geostationary Lightning Mapper Flash Rates Within Intense Convective Storms[J],2020,125(14).
APA	Rutledge S.A.,Hilburn K.A.,Clayton A.,Fuchs B.,&Miller S.D..(2020).Evaluating Geostationary Lightning Mapper Flash Rates Within Intense Convective Storms.Journal of Geophysical Research: Atmospheres,125(14).
MLA	Rutledge S.A.,et al."Evaluating Geostationary Lightning Mapper Flash Rates Within Intense Convective Storms".Journal of Geophysical Research: Atmospheres 125.14(2020).