2026-08-07 エディンバラ大学
＜関連情報＞
- https://www.ed.ac.uk/news/siberian-methane-emissions-double-in-a-decade-study-finds
- https://www.science.org/doi/10.1126/science.aea5828
温暖化による火災とメタン生成により、シベリアのメタン排出量が10年で倍増 Decadal doubling of Siberian methane emissions due to warming-induced fires and methanogenesis
Sihong Zhu, Yi Liu, Paul I. Palmer, Liang Feng, […] , and Stephen M. Platt
Science Published:6 Aug 2026
DOI:https://doi.org/10.1126/science.aea5828
Abstract
The northern permafrost region, which stores double the amount of carbon in the atmosphere, is vulnerable to accelerated warming. Methane emissions from thawing permafrost may eventually result in a climate-carbon feedback. Our analysis of atmospheric methane data shows that Siberian growing-season methane emissions have increased by 12.0 ± 1.9 teragrams of methane (TgCH4) (5% per year) over the period 2010–2023. We reveal contrasting Siberian hydrological trends linked to high-pressure systems and distinct air-sea-land interactions. Warmer, drier conditions over eastern Siberia enhance fire-related emissions (0.7 ± 0.1 TgCH4 year−2), and wetter conditions over western Siberia promote wetland-related emissions (0.4 ± 0.1 TgCH4 year−2). Weakly nonlinear relationships between temperature maxima and emissions suggest that by 2050, higher Siberian emissions could offset about 20% of the global methane reduction required for climate targets, with eastern Siberia dominating the projected increase.
