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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TLDR
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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Influence of iron redox cycling on organo-mineral associations in Arctic tundra soil
Elizabeth Herndon,Elizabeth Herndon,Amineh AlBashaireh,Amineh AlBashaireh,David M. Singer,Taniya Roy Chowdhury,Baohua Gu,David E. Graham +7 more
TL;DR: In this paper, chemical properties of solid-phase Fe and organic matter in organic and mineral horizons within the seasonally thawed active layer of Arctic tundra on the North Slope of Alaska were examined.
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Stoichiometry and temperature sensitivity of methanogenesis and CO2 production from saturated polygonal tundra in Barrow, Alaska
Taniya Roy Chowdhury,Elizabeth Herndon,Tommy J. Phelps,Dwayne A. Elias,Baohua Gu,Liyuan Liang,Stan D. Wullschleger,David E. Graham +7 more
TL;DR: Temporal dynamics of CO2 production and methanogenesis at -2 °C showed evidence of fundamentally different mechanisms of substrate limitation and inhibited microbial growth at soil water freezing points compared to warmer temperatures, and nonlinear regression better modeled the initial rates and estimates of Q10 values for CO2 that showed higher sensitivity in the organic-rich soils of polygon center and trough than the relatively drier ridge soils.
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The Case for Digging Deeper: Soil Organic Carbon Storage, Dynamics, and Controls in Our Changing World
Cole D. Gross,Robert B. Harrison +1 more
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Timing of retrogressive thaw slump initiation in the Noatak Basin, northwest Alaska, USA
TL;DR: In this article, the authors examined relationships among retrogressive thaw slump initiation and annual air temperature, precipitation, and snow cover using time series of satellite imagery and weather station data in northwest Alaska.
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Climate warming alters subsoil but not topsoil carbon dynamics in alpine grassland.
Juan Jia,Zhenjiao Cao,Chengzhu Liu,Zhenhua Zhang,Li Lin,Yiyun Wang,Negar Haghipour,Lukas Wacker,Hongyan Bao,Thorston Dittmar,Myrna J. Simpson,Huan Yang,Thomas W. Crowther,Timothy I. Eglinton,Jin-Sheng He,Jin-Sheng He,Xiaojuan Feng +16 more
TL;DR: Show substantial changes in carbon allocation and dynamics of the subsoil but not topsoil in the Qinghai-Tibetan alpine grasslands over 5 years of warming, which mirrored an accumulation of lipids and sugars at the expense of lignin in the warmed bulkSubsoil.
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