永久冻土
环境科学
水槽(地理)
温室气体
生态系统
焊剂(冶金)
碳汇
大气科学
水文学(农业)
气候变化
初级生产
碳循环
自然地理学
地质学
生态学
地理
海洋学
化学
岩土工程
有机化学
生物
地图学
作者
Justine Ramage,McKenzie Kuhn,Anna‐Maria Virkkala,Carolina Voigt,Maija E. Marushchak,Ana Bastos,Christina Biasi,Josep G. Canadell,Philippe Ciais,Efrén López‐Blanco,Susan M. Natali,David Olefeldt,Stefano Potter,Benjamin Poulter,Brendan M. Rogers,Edward A. G. Schuur,Claire C. Treat,M. R. Turetsky,Jennifer D. Watts,Gustaf Hugelius
摘要
Abstract The northern permafrost region has been projected to shift from a net sink to a net source of carbon under global warming. However, estimates of the contemporary net greenhouse gas (GHG) balance and budgets of the permafrost region remain highly uncertain. Here, we construct the first comprehensive bottom‐up budgets of CO 2 , CH 4 , and N 2 O across the terrestrial permafrost region using databases of more than 1000 in situ flux measurements and a land cover‐based ecosystem flux upscaling approach for the period 2000–2020. Estimates indicate that the permafrost region emitted a mean annual flux of 12 (−606, 661) Tg CO 2 –C yr −1 , 38 (22, 53) Tg CH 4 –C yr −1 , and 0.67 (0.07, 1.3) Tg N 2 O–N yr −1 to the atmosphere throughout the period. Thus, the region was a net source of CH 4 and N 2 O, while the CO 2 balance was near neutral within its large uncertainties. Undisturbed terrestrial ecosystems had a CO 2 sink of −340 (−836, 156) Tg CO 2 –C yr −1 . Vertical emissions from fire disturbances and inland waters largely offset the sink in vegetated ecosystems. When including lateral fluxes for a complete GHG budget, the permafrost region was a net source of C and N, releasing 144 (−506, 826) Tg C yr −1 and 3 (2, 5) Tg N yr −1 . Large uncertainty ranges in these estimates point to a need for further expansion of monitoring networks, continued data synthesis efforts, and better integration of field observations, remote sensing data, and ecosystem models to constrain the contemporary net GHG budgets of the permafrost region and track their future trajectory.
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