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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Responses of tundra soil microbial communities to half a decade of experimental warming at two critical depths.
Eric R. Johnston,Eric R. Johnston,Janet K. Hatt,Zhili He,Liyou Wu,Xue Guo,Yiqi Luo,Yiqi Luo,Edward A. G. Schuur,James M. Tiedje,Jizhong Zhou,Jizhong Zhou,Jizhong Zhou,Konstantinos T. Konstantinidis +13 more
TL;DR: Alaskan tundra soils were subjected to experimental in situ warming by ∼1.1 °C above ambient temperature, and the microbial communities were evaluated using metagenomics after 4.5 years, demonstrating that microbial responses to warming are rapid and identify potential biomarkers that could be important in modeling.
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Moisture drives surface decomposition in thawing tundra
Caitlin E. Hicks Pries,Caitlin E. Hicks Pries,Edward A. G. Schuur,Jason G. Vogel,Susan M. Natali +4 more
TL;DR: In this article, the authors used a common substrate to measure how permafrost thaw affects decomposition rates in the surface soil in a natural permafeur thaw gradient and a warming experiment in Healy, Alaska.
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Sedimentology and geochemistry of thermokarst ponds in discontinuous permafrost, subarctic Quebec, Canada
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TL;DR: In this article, a multiproxy study conducted in a subarctic site with many thermokarst ponds near Kuujjuarapik-Whapmagoostui, on the eastern shore of Hudson Bay, revealed two distinct sedimentary facies, from bottom to top: 1) massive marine silts and clays deposited during postglacial Tyrrell Sea transgression (ca. 8000 to 6000 cal yr BP), subsequently emerged by glacio-isostatic rebound and more recently, affected by permafrost inception and growth; 2) laminated organic
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