小组使用了一个基于卫星的大气反演系统来监测北方森林的火灾排放量。随着越来越温暖和干燥的火灾季节的到来，野火正在迅速蔓延到北方森林。通常占全球火灾二氧化碳排放量10%的北方火灾，在2021年贡献了23%(4.8亿公吨碳)，是自2000年以来的最高比例。2021年是不正常的一年，因为北美和欧亚北方森林同时经历了最严重的缺水。越来越多的极端北方火灾和更强的气候-火灾反馈对减缓气候变化的工作提出了挑战。
据了解，极端野火正变得越来越普遍，对地球气候的影响也越来越大。与热带森林相比，北方森林的野火引起的关注要少得多，尽管北方森林是地球上最广泛的生物群落之一，并且正在经历最快的变暖。
附：英文原文
Title: Record-high CO2 emissions from boreal fires in 2021
Author: Bo Zheng, Philippe Ciais, Frederic Chevallier, Hui Yang, Josep G. Canadell, Yang Chen, Ivar R. van der Velde, Ilse Aben, Emilio Chuvieco, Steven J. Davis, Merritt Deeter, Chaopeng Hong, Yawen Kong, Haiyan Li, Hui Li, Xin Lin, Kebin He, Qiang Zhang
Issue&Volume: 2023-03-03
Abstract: Extreme wildfires are becoming more common and increasingly affecting Earth’s climate. Wildfires in boreal forests have attracted much less attention than those in tropical forests, although boreal forests are one of the most extensive biomes on Earth and are experiencing the fastest warming. We used a satellite-based atmospheric inversion system to monitor fire emissions in boreal forests. Wildfires are rapidly expanding into boreal forests with emerging warmer and drier fire seasons. Boreal fires, typically accounting for 10% of global fire carbon dioxide emissions, contributed 23% (0.48 billion metric tons of carbon) in 2021, by far the highest fraction since 2000. 2021 was an abnormal year because North American and Eurasian boreal forests synchronously experienced their greatest water deficit. Increasing numbers of extreme boreal fires and stronger climate–fire feedbacks challenge climate mitigation efforts.
DOI: ade0805
Source: https://www.science.org/doi/10.1126/science.ade0805