2℃の温暖化が北極の炭素吸収を促進する一方で山岳地域では弱体化（Scientists Discover 2°C Warming Boosts Arctic Carbon Sink but Weakens Alpine One）

2025-09-17 中国科学院（CAS）

＜関連情報＞

• https://english.cas.cn/newsroom/research_news/earth/202509/t20250915_1054752.shtml
• https://www.science.org/doi/10.1126/sciadv.adt8366

温暖化下における北極圏と高山永久凍土の気候-炭素フィードバックのトレードオフ Climate-carbon feedback tradeoff between Arctic and alpine permafrost under warming

Tao Bao, Xiyan Xu, Gensuo Jia, Xingru Zhu, […] , and Yuanhe Yang
Science Advances  Published:17 Sep 2025
DOI:https://doi.org/10.1126/sciadv.adt8366

Abstract

Whether greenhouse gas (GHG) emissions from permafrost will trigger positive climate feedbacks under warming remains unknown. Here, we synthesized the response of growing season carbon dioxide (CO₂), methane (CH₄), and nitrous oxide (N₂O) emissions to experimentally manipulated warming of ~2°C for permafrost in alpine and Arctic regions. Warming weakened the GHG sink of alpine permafrost, thereby increasing (13%) its global warming potential, but strengthened the GHG sink of Arctic permafrost and decreased (−10%) its global warming potential. When warming caused drying of alpine permafrost soils, the CO₂ sink weakened but the CH₄ sink increased. In contrast, warming of relatively wet Arctic permafrost increased the CO₂ sink and CH₄ source. Warming led to much stronger increases of the N₂O source in alpine than Arctic permafrost. Although keeping additional warming below 2°C in permafrost regions can avoid the positive permafrost-climate feedback, measures are needed to maintain fragile carbon sink of alpine permafrost ecosystems.