Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017JD027639 |
Optimizing Precipitation Thresholds for Best Correlation Between Dry Lightning and Wildfires | |
Vant-Hull, Brian1; Thompson, Tollisha2; Koshak, William3 | |
2018-03-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2018 |
卷号 | 123期号:5页码:2628-2639 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | This work examines how to adjust the definition of dry lightning in order to optimize the correlation between dry lightning flash count and the climatology of large (>400km(2)) lightning-ignited wildfires over the contiguous United States (CONUS). The National Lightning Detection Network and National Centers for Environmental Prediction Stage IV radar-based, gauge-adjusted precipitation data are used to form climatic data sets. For a 13year analysis period over CONUS, a correlation of 0.88 is found between annual totals of wildfires and dry lightning. This optimal correlation is found by defining dry lightning as follows: on a 0.1 degrees hourly grid, a precipitation threshold of no more than 0.3mm may accumulate during any hour over a period of 3-4days preceding the flash. Regional optimized definitions vary. When annual totals are analyzed as done here, no clear advantage is found by weighting positive polarity cloud-to-ground (+CG) lightning differently than -CG lightning. The high variability of dry lightning relative to the precipitation and lightning from which it is derived suggests it would be an independent and useful climate indicator. Plain Language Summary Many wildfires are started by dry lightning, which are flashes that occur with low or no precipitation. There is no uniformly accepted definition for dry lightning, which must include an upper threshold on precipitation, the length of the dry period preceding the precipitation, and the spatial resolution over which lightning and precipitation are colocated. This work attempts to find a definition of dry lightning over the continental United States using lightning, precipitation, and wildfire data sets. The lightning and precipitation are located in space and time to the hour and on a 0.1 degrees grid. The location and timing of wildfire initiation is much harder to identify, and so is left as annual/national totals to be targeted by the best definition of dry lightning. We found an upper precipitation threshold of 0.2 mm/h and a dry duration of 30 h defines dry lightning that best matches the wildfire data set. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000428437100015 |
WOS关键词 | WILDLAND FIRE ; FOREST-FIRES ; IGNITION |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/33606 |
专题 | 气候变化 |
作者单位 | 1.CUNY, CREST Inst, New York, NY 10021 USA; 2.New York City Coll Technol, Brooklyn, NY USA; 3.NASA, Marshall Space Flight Ctr, Huntsville, AL USA |
推荐引用方式 GB/T 7714 | Vant-Hull, Brian,Thompson, Tollisha,Koshak, William. Optimizing Precipitation Thresholds for Best Correlation Between Dry Lightning and Wildfires[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2018,123(5):2628-2639. |
APA | Vant-Hull, Brian,Thompson, Tollisha,&Koshak, William.(2018).Optimizing Precipitation Thresholds for Best Correlation Between Dry Lightning and Wildfires.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,123(5),2628-2639. |
MLA | Vant-Hull, Brian,et al."Optimizing Precipitation Thresholds for Best Correlation Between Dry Lightning and Wildfires".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 123.5(2018):2628-2639. |
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