globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2795
论文题名:
Methane emissions proportional to permafrost carbon thawed in Arctic lakes since the 1950s
作者: Walter Anthony K.; Daanen R.; Anthony P.; Schneider Von Deimling T.; Ping C.-L.; Chanton J.P.; Grosse G.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2016
卷: 9, 期:9
起始页码: 679
结束页码: 682
语种: 英语
Scopus关键词: arctic environment ; climate feedback ; emission ; lacustrine environment ; methane ; organic carbon ; permafrost ; radiocarbon dating ; soil organic matter ; thawing ; thermokarst ; Alaska ; Canada ; Siberia ; Sweden ; United States
英文摘要: Permafrost thaw exposes previously frozen soil organic matter to microbial decomposition. This process generates methane and carbon dioxide, and thereby fuels a positive feedback process that leads to further warming and thaw. Despite widespread permafrost degradation during the past â 1/440 years, the degree to which permafrost thaw may be contributing to a feedback between warming and thaw in recent decades is not well understood. Radiocarbon evidence of modern emissions of ancient permafrost carbon is also sparse. Here we combine radiocarbon dating of lake bubble trace-gas methane (113 measurements) and soil organic carbon (289 measurements) for lakes in Alaska, Canada, Sweden and Siberia with numerical modelling of thaw and remote sensing of thermokarst shore expansion. Methane emissions from thermokarst areas of lakes that have expanded over the past 60 years were directly proportional to the mass of soil carbon inputs to the lakes from the erosion of thawing permafrost. Radiocarbon dating indicates that methane age from lakes is nearly identical to the age of permafrost soil carbon thawing around them. Based on this evidence of landscape-scale permafrost carbon feedback, we estimate that 0.2 to 2.5 Pg permafrost carbon was released as methane and carbon dioxide in thermokarst expansion zones of pan-Arctic lakes during the past 60 years. © 2016 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105944
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: Water and Environmental Research Center, University of Alaska Fairbanks, Fairbanks, AK, United States; Division of Geological and Geophysical Surveys, Alaska Department of Natural Resources, Fairbanks, AK, United States; Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany; Max Planck Institute for Meteorology, Hamburg, Germany; School of Natural Resources and Extension, University of Alaska Fairbanks, Fairbanks, AK, United States; Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, United States

Recommended Citation:
Walter Anthony K.,Daanen R.,Anthony P.,et al. Methane emissions proportional to permafrost carbon thawed in Arctic lakes since the 1950s[J]. Nature Geoscience,2016-01-01,9(9)
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