2021年の山火事で記録的な量の二酸化炭素が排出された(Wildfires in 2021 emitted a record-breaking amount of carbon dioxide)

ad
ad

カリフォルニア大学アーバイン校が主導した研究により、北緯の森林火災が最も大きな原因であることが判明した。 UC Irvine-led study found northern-latitude forest fires to be the highest source

2023-03-02 カリフォルニア大学校アーバイン校(UCI)

北極圏で発生した森林火災から放出された二酸化炭素の量が、2021年に前例のない記録的な高さに達したと、カリフォルニア大学アーバイン校の地球システム科学者が率いる国際研究チームが報告した。
北米とユーラシアの針葉樹林で燃えた火災によって、約半ギガトンの炭素が放出された。この数字は2000年から2020年の間の平均二酸化炭素排出量の150%にあたる。
研究者は、二酸化炭素排出が地球を温暖化させ、火災を増やし、その結果、より多くの炭素が放出される気候-火災フィードバックの一部であると指摘した。

<関連情報>

2021年、北方領土の火災によるCO2排出量が過去最高を記録 Record-high CO2 emissions from boreal fires in 2021

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
Science  Published:2 Mar 2023
DOI:https://doi.org/10.1126/science.ade0805

Emission emergency

Carbon dioxide emissions from boreal forest fires have been increasing since at least the year 2000, reaching a new high in 2021, Zheng et al. report. Although boreal fires typically produce about 10% of global carbon dioxide emissions from wildfires, in 2021 they produced nearly one quarter of the total. This abnormally high total resulted from the concurrence of water deficits in North America and Eurasia, which was an unusual situation. The increasing number of extreme wildfires that is accompanying global warming presents a real challenge to global climate change mitigation efforts. —HJS

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.

ad

1900環境一般
ad
ad
Follow
ad
タイトルとURLをコピーしました