Canadian forests are more conducive to high-severity fires in recent decades

• 成果类型: Article
• 署名作者: Wang, Weiwei; Wang, Xianli; Flannigan, Mike D.; Guindon, Luc; Swystun, Tom; Castellanos-Acuna, Dante; Wu, Wanli; Wang, Guangyu
• 署名单位: University of British Columbia; Natural Resources Canada; Canadian Forest Service; Thompson Rivers University; Natural Resources Canada; Canadian Forest Service; Natural Resources Canada; Canadian Forest Service; Great Lakes Forestry Centre; University of Alberta; Parks Canada
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-10349
• DOI: 10.1126/science.ado1006
• 发表日期: 2025-01-03
• 页码: 91-+
• 关键词: quantifying burn severity; spatial interpolation; weather; climate; MODEL; landscape; elevation; wildfires; SPREAD; dnbr

摘要

Canada has experienced more-intense and longer fire seasons with more-frequent uncontrollable wildfires over the past decades. However, the effect of these changes remains unknown. This study identifies driving forces of burn severity and estimates its spatiotemporal variations in Canadian forests. Our results show that fuel aridity was the most influential driver of burn severity, summer months were more prone to severe burning, and the northern areas were most influenced by the changing climate. About 6% (0.54 to 14.64%) of the modeled areas show significant increases in the number of days conducive to high-severity burning during 1981 to 2020, most of which were found during 2001 to 2020 and in the spring and autumn. The extraordinary 2023 fire season demonstrated similar spatial patterns but more-widespread escalations in burn severity.