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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Forests on thawing permafrost: fragmentation, edge effects, and net forest loss
TL;DR: It is demonstrated that the rate of forest loss correlates positively with the degree of fragmentation as quantified by perimeter to area ratio of peat plateaus (edge : area), and water uptake by trees was sevenfold greater in the plateau interior than at the edges with direct implications for tree radial growth.
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Ancient low–molecular-weight organic acids in permafrost fuel rapid carbon dioxide production upon thaw
Travis W. Drake,Travis W. Drake,Kimberly P. Wickland,Robert G. M. Spencer,Diane M. McKnight,Robert G. Striegl +5 more
TL;DR: In this article, the authors demonstrate that ancient dissolved organic carbon (DOC) leached from 35,800 y B.P. permafrost soils is rapidly mineralized to CO2.
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Present state of global wetland extent and wetland methane modelling: methodology of a model inter-comparison project (WETCHIMP)
R. Wania,Joe R. Melton,Joe R. Melton,Elke L. Hodson,Benjamin Poulter,Bruno Ringeval,Bruno Ringeval,Bruno Ringeval,Renato Spahni,Theodore J. Bohn,C. A. Avis,C. A. Avis,Guangsheng Chen,Alexey V. Eliseev,Alexey V. Eliseev,Peter O. Hopcroft,William J. Riley,Z. M. Subin,Z. M. Subin,Hanqin Tian,P.M. van Bodegom,Thomas Kleinen,Zicheng Yu,Joy S. Singarayer,Sibylle Zürcher,Dennis P. Lettenmaier,David J. Beerling,S. N. Denisov,Catherine Prigent,Fabrice Papa,Jed O. Kaplan +30 more
TL;DR: The Wetland and Wetland CH4 Intercomparison of Models Project (WETCHIMP) was created to evaluate the present ability to simulate large-scale wetland characteristics and corresponding methane (CH4) emissions as discussed by the authors.
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Risk of multiple interacting tipping points should encourage rapid CO2 emission reduction
TL;DR: In this paper, the authors incorporated five interacting climate tipping points into a stochastic-dynamic integrated assessment model, calibrating their likelihoods and interactions on results from an existing expert elicitation.
Journal ArticleDOI
Estimating the near-surface permafrost-carbon feedback on global warming
T. Schneider von Deimling,Malte Meinshausen,Malte Meinshausen,Anders Levermann,Anders Levermann,Veronika Huber,Katja Frieler,David M. Lawrence,Victor Brovkin +8 more
TL;DR: In this paper, the authors couple a new permafrost module to a reduced complexity carbon-cycle climate model, which allows them to perform a large ensemble of simulations to span the uncertainties listed above and thereby the results provide an estimate of the potential strength of the feedback from newly thawed carbon.
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