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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Shifts of tundra bacterial and archaeal communities along a permafrost thaw gradient in Alaska.
Jie Deng,Yunfu Gu,Yunfu Gu,Jin Zhang,Kai Xue,Yujia Qin,Mengting Yuan,Huaqun Yin,Huaqun Yin,Zhili He,Liyou Wu,Edward A. G. Schuur,James M. Tiedje,Jizhong Zhou,Jizhong Zhou,Jizhong Zhou +15 more
TL;DR: Investigating soil bacterial and archaeal communities by Illumina MiSeq sequencing of 16S rRNA gene amplicons across a permafrost thaw gradient at different depths in Alaska revealed different impacts of thaw in the organic and mineral horizons and suggests the importance of studying both the upper and deeper soils while evaluating microbial responses to permaf frost thaw.
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Abundance, size distributions and trace-element binding of organic and iron-rich nanocolloids in Alaskan rivers, as revealed by field-flow fractionation and ICP-MS
TL;DR: In this paper, the role of colloids and organic matter in the transport of trace elements in Northern high latitude watersheds influenced by permafrost was examined by collecting water samples from six small rivers in the Yukon River basin in central Alaska.
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Large Differences in Global and Regional Total Soil Carbon Stock Estimates Based on SoilGrids, HWSD, and NCSCD: Intercomparison and Evaluation Based on Field Data From USA, England, Wales, and France
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Pan-arctic trends in terrestrial dissolved organic matter from optical measurements
Paul J. Mann,Robert G. M. Spencer,Peter J. Hernes,Johan Six,George R. Aiken,Suzanne E. Tank,James W. McClelland,Kenna D. Butler,Rachael Y. Dyda,Robert M. Holmes +9 more
TL;DR: In this article, the authors characterize the DOM composition and optical properties of the six largest arctic rivers draining into the Arctic Ocean to examine the ability of optical measurements to provide meaningful insights into terrigenous carbon export patterns and biogeochemical cycling.
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Out‐gassing of CO2 from Siberian Shelf seas by terrestrial organic matter decomposition
Leif G. Anderson,Sara Jutterström,Sofia Hjalmarsson,Iréne Wåhlström,Igor Semiletov,Igor Semiletov +5 more
TL;DR: In this paper, the authors show that significant microbial decay of terrestrial organic matter occurs in the Siberian Shelf Seas, which results in a substantial flux of CO2 to the atmosphere.
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