COVID-19 lockdowns drive decline in active fires in southeastern United States


Posted: 2021-10-19 19:00:00
Proc Natl Acad Sci U S A . 2021 Oct 26;118(43):e2105666118. doi: 10.1073/pnas.2105666118. Affiliations Expand Affiliations 1 Earth Sciences Division, Biospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771; benjamin.poulter@nasa.gov. 2 Rocky Mountain Research Station, Fire Sciences Laboratory, US Forest Service, Missoula, MT 59803. 3 Tall Timbers Research Station, Tallahassee, FL 32312. Item in Clipboard Benjamin Poulter et al. Proc Natl Acad Sci U S A. 2021. Show details Display options Display options Format Proc Natl Acad Sci U S A . 2021 Oct 26;118(43):e2105666118. doi: 10.1073/pnas.2105666118. Affiliations 1 Earth Sciences Division, Biospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771; benjamin.poulter@nasa.gov. 2 Rocky Mountain Research Station, Fire Sciences Laboratory, US Forest Service, Missoula, MT 59803. 3 Tall Timbers Research Station, Tallahassee, FL 32312. Item in Clipboard CiteDisplay options Display options Format Abstract Fire is a common ecosystem process in forests and grasslands worldwide. Increasingly, ignitions are controlled by human activities either through suppression of wildfires or intentional ignition of prescribed fires. The southeastern United States leads the nation in prescribed fire, burning ca. 80% of the country's extent annually. The COVID-19 pandemic radically changed human behavior as workplaces implemented social-distancing guidelines and provided an opportunity to evaluate relationships between humans and fire as fire management plans were postponed or cancelled. Using active fire data from satellite-based observations, we found that in the southeastern United States, COVID-19 led to a 21% reduction in fire activity compared to the 2003 to 2019 average. The reduction was more pronounced for federally managed lands, up to 41% below average compared to the past 20 y (38% below average compared to the past decade). Declines in fire activity were partly affected by an unusually wet February before the COVID-19 shutdown began in mid-March 2020. Despite the wet spring, the predicted number of active fire detections was still lower than expected, confirming a COVID-19 signal on ignitions. In addition, prescribed fire management statistics reported by US federal agencies confirmed the satellite observations and showed that, following the wet February and before the mid-March COVID-19 shutdown, cumulative burned area was approaching record highs across the region. With fire return intervals in the southeastern United States as frequent as 1 to 2 y, COVID-19 fire impacts will contribute to an increasing backlog in necessary fire management activities, affecting biodiversity and future fire danger. Keywords: COVID-19; fire; forest. Copyright © 2021 the Author(s). Published by PNAS. Conflict of interest statement The authors declare no competing interest. References Liu F., et al. Abrupt decline in tropospheric nitrogen dioxide over China after the outbreak of COVID-19. Sci. Adv.. 2020;6:eabc2992. Patel P. P., Mondal S., Ghosh K. G.. Some respite for India’s dirtiest river? Examining the Yamuna’s water quality at Delhi during the COVID-19 lockdown period. Sci. Total Environ.. 2020;744:140851. Lecocq T., et al. Global quieting of high-frequency seismic noise due to COVID-19 pandemic lockdown measures. Science. 2020;369:1338–1343. Small C., Sousa D.. Spatiotemporal evolution of COVID-19 infection and detection within night light networks: Comparative analysis of USA and China. Appl. Netw. Sci.. 2021;6:10. Goldberg D. L., et al. Disentangling the impact of the COVID-19 lockdowns on urban NO2 from natural variability. Geophys. Res. Lett.. 2020;47:e2020GL089269. Show all 50 references [x] Cite Copy Format: Send To [x]

参考サイト PubMed: covid-19



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