Soil organic carbon pools in the northern circumpolar permafrost region
Charles Tarnocai,Josep G. Canadell,Edward A. G. Schuur,Peter Kuhry,Galina Mazhitova,Sergei Zimov +5 more
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In this article, the authors reported a new estimate of the carbon pools in soils of the northern permafrost region, including deeper layers and pools not accounted for in previous analyses.Abstract:
of all soils in the northern permafrost region is approximately 18,782 � 10 3 km 2 ,o r approximately 16% of the global soil area. In the northern permafrost region, organic soils (peatlands) and cryoturbated permafrost-affected mineral soils have the highest mean soil organic carbon contents (32.2–69.6 kg m �2 ). Here we report a new estimate of the carbon pools in soils of the northern permafrost region, including deeper layers and pools not accounted for in previous analyses. Carbon pools were estimated to be 191.29 Pg for the 0–30 cm depth, 495.80 Pg for the 0–100 cm depth, and 1024.00 Pg for the 0–300 cm depth. Our estimate for the first meter of soil alone is about double that reported for this region in previous analyses. Carbon pools in layers deeper than 300 cm were estimated to be 407 Pg in yedoma deposits and 241 Pg in deltaic deposits. In total, the northern permafrost region contains approximately 1672 Pg of organic carbon, of which approximately 1466 Pg, or 88%, occurs in perennially frozen soils and deposits. This 1672 Pg of organic carbon would account for approximately 50% of the estimated global belowground organic carbon pool.read more
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Around one third of current Arctic Ocean primary production sustained by rivers and coastal erosion
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Temperature Sensitivity of Methane Production in the Permafrost Active Layer at Stordalen, Sweden: a Comparison with Non-permafrost Northern Wetlands
TL;DR: In this article, the relationship between CH4 production and in situ conditions within the permafrost active layer during a single melt season at Stordalen, Sweden, with a specific emphasis on temperature sensitivity of methanogenesis was determined.
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Modeling methane emissions from arctic lakes: Model development and site-level study
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Tundra vegetation change near Barrow, Alaska (1972–2010)
TL;DR: The most dramatic changes in the cover of bryophytes, graminoids and bare ground coincided with a lemming high in 2008 as mentioned in this paper, while the response of other plant functional groups varied.
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Warming-induced permafrost thaw exacerbates tundra soil carbon decomposition mediated by microbial community.
Jiajie Feng,Cong Wang,Jiesi Lei,Yunfeng Yang,Qingyun Yan,Qingyun Yan,Xishu Zhou,Xishu Zhou,Xishu Zhou,Xuanyu Tao,Daliang Ning,Mengting Yuan,Yujia Qin,Zhou J. Shi,Xue Guo,Xue Guo,Zhili He,Zhili He,Joy D. Van Nostrand,Liyou Wu,Rosvel G. Bracho-Garillo,C. Ryan Penton,James R. Cole,Konstantinos T. Konstantinidis,Yiqi Luo,Edward A. G. Schuur,James M. Tiedje,James M. Tiedje,Jizhong Zhou,Jizhong Zhou,Jizhong Zhou +30 more
TL;DR: The results demonstrate that microbial responses associated with carbon cycling could lead to positive feedbacks that accelerate SOC decomposition in tundra regions, which is alarming because SOC loss is unlikely to subside owing to changes in microbial community composition.
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