研究人员确定了加拿大森林燃烧严重程度的驱动因素，并估计了其时空变化。结果表明，燃料干燥是影响燃烧严重程度的最主要因素，夏季更容易发生严重燃烧，而北部地区受气候变化的影响最大。
约6%（0.54- 14.64%）的模拟区显示，1981-2020年期间有利于高强度燃烧的日数显著增加，其中大部分发生在2001-2020年的春季、秋季。非同寻常的2023年火灾季节表现出类似的空间格局，但燃烧严重程度却更为广泛的升级。
据悉，在过去的几十年里，加拿大经历了更强烈、更长的火灾季节，和更频繁的无法控制的野火。然而，这些变化的影响仍然未知。
附：英文原文
Title: Canadian forests are more conducive to high-severity fires in recent decades
Author: Weiwei Wang, Xianli Wang, Mike D. Flannigan, Luc Guindon, Tom Swystun, Dante Castellanos-Acuna, Wanli Wu, Guangyu Wang
Issue&Volume: 2025-01-03
Abstract: 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.
DOI: ado1006
Source: https://www.science.org/doi/10.1126/science.ado1006