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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Degradation changes stable carbon isotope depth profiles in palsa peatlands
TL;DR: In this paper, the degradation of palsa peatlands by accelerated permafrost thawing can be identified with stable carbon isotope depth profiles of undisturbed and degraded sites of hummocks as well as hollows.
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Toward explaining the Holocene carbon dioxide and carbon isotope records: Results from transient ocean carbon cycle-climate simulations
TL;DR: In this article, the early Holocene pCO2 decrease reflects terrestrial uptake largely compensated by carbonate deposition and ocean sediment responses, and additional small contributions arise from Holocene changes in sea surface temperature, ocean circulation, and export productivity.
Journal ArticleDOI
Geochemical drivers of organic matter decomposition in arctic tundra soils
Elizabeth Herndon,Elizabeth Herndon,Ziming Yang,John R. Bargar,Noémie Janot,Noémie Janot,Tom Regier,David E. Graham,Stan D. Wullschleger,Baohua Gu,Liyuan Liang +10 more
TL;DR: In this paper, geochemical factors that influence microbial production of carbon dioxide (CO2) and methane (CH4) in the seasonally-thawed active layer of interstitial polygonal tundra near Barrow, Alaska were evaluated.
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Geophysical estimation of shallow permafrost distribution and properties in an ice-wedge polygon-dominated Arctic tundra region
Baptiste Dafflon,Susan S. Hubbard,Craig Ulrich,John E. Peterson,Yuxin Wu,Haruko Wainwright,Timothy J. Kneafsey +6 more
TL;DR: Shallow permafrost distribution and characteristics are important for predicting ecosystem feedbacks to a changing climate over decadal to century timescales because they can drive active l... as discussed by the authors.
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Vertical distribution and influencing factors of soil organic carbon in the Loess Plateau, China
TL;DR: It is demonstrated that a large amount of organic carbon is stored in deep soil, indicating that a better understanding of the reserves and cycles of deep soil carbon is a critical factor in the effective management of terrestrial ecosystems.
References
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