Spatial, Temporal, and Electrical Characteristics of Lightning in Reported Lightning-Initiated Wildfire Events.
| Autor: | Schultz CJ; NASA George C. Marshall Space Flight Center, Huntsville, AL 35812, USA., Nauslar NJ; NOAA/NWS/NCEP Storm Prediction Center, Norman, OK., Wachter JB; United States Forest Service, Redding, CA., Hain CR; NASA George C. Marshall Space Flight Center, Huntsville, AL 35812, USA., Bell JR; Earth System Science Center, University of Alabama in Huntsville, Huntsville, AL. |
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| Jazyk: | angličtina |
| Zdroj: | Fire (Basel, Switzerland) [Fire (Basel)] 2019 Jun; Vol. 2 (2). Date of Electronic Publication: 2019 Apr 03. |
| DOI: | 10.3390/fire2020018 |
| Abstrakt: | Analysis was performed to determine if a lightning flash could be associated with every reported lightning-initiated wildfire that grew to at least 4 km 2 . In total, 905 lightning-initiated wildfires within CONUS between 2012 and 2015 were analyzed. Fixed and fire radius search methods showed that 81-88% of wildfires had a corresponding lightning flash within a 14 day period prior to the report date. The two methods showed that 52-60% of lightning-initiated wildfire were reported on the same day as the closest lightning flash. The fire radius method indicated the most promising spatial results, where the median distance between the closest lightning and the wildfire start location was 0.83 km, followed by a 75 th percentile of 1.6 km, and a 95 th percentile of 5.86 km. Ninety percent of the closest lightning flashes to wildfires were negative polarity. Maximum flash densities were less than 0.41 flashes km2 for the 24 hour period at the fire start location. The majority of lightning-initiated holdover events were observed in the Western CONUS, with a peak density in north-central Idaho. A twelve day holdover event from New Mexico was also discussed; outlining the opportunities and limitations of using lightning data to characterize wildfires. Competing Interests: Conflicts of Interest: The authors declare no conflicts of interested in regard to this work. |
| Databáze: | MEDLINE |
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