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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A simplified, data-constrained approach to estimate the permafrost carbon-climate feedback
Charles D. Koven,Edward A. G. Schuur,Christina Schädel,Theodore J. Bohn,Eleanor J. Burke,Guangsheng Chen,Xiaodong Chen,Philippe Ciais,Guido Grosse,Jennifer W. Harden,Daniel J. Hayes,Gustaf Hugelius,Elchin Jafarov,Gerhard Krinner,Peter Kuhry,David M. Lawrence,Andrew H. MacDougall,Sergei Marchenko,A. D. McGuire,Susan M. Natali,Dmitry Nicolsky,David Olefeldt,Shushi Peng,Vladimir E. Romanovsky,Kevin Schaefer,Jens Strauss,Claire C. Treat,Merritt R. Turetsky +27 more
TL;DR: An approach to estimate the feedback from large-scale thawing of permafrost soils using a simplified, data-constrained model that combines three elements: soil carbon maps and profiles to identify the distribution and type of C in permaf frost soils; incubation experiments to quantify the rates of C lost after thaw; and models of soil thermal dynamics in response to climate warming.
Journal ArticleDOI
Experimental drought in a tropical rain forest increases soil carbon dioxide losses to the atmosphere
TL;DR: Together, the data suggest that declines in precipitation in tropical rain forests could drive higher CO2 fluxes to the atmosphere both via increased soil 02 availability and through responses to elevated DOM concentrations.
Journal ArticleDOI
Temperature and peat type control CO2 and CH4 production in Alaskan permafrost peats
Claire C. Treat,Wilfred M. Wollheim,Ruth K. Varner,A. S. Grandy,Julie Talbot,Stephen E. Frolking +5 more
TL;DR: Temperature, moisture, organic matter, and microbial controls on soil organic carbon (SOC) losses following permafrost thaw in peat soils across Alaska, and carbon dioxide and methane emissions varied depending on the peat type and peat decomposition stage rather than thermal state.
Methane seeps along boundaries of arctic permafrost thaw and melting glaciers
TL;DR: In this paper, the authors document the release of geologic methane to the atmosphere from abundant gas seeps concentrated along boundaries of permafrost thaw and receding glaciers in Alaska.
Journal ArticleDOI
Patterns and persistence of hydrologic carbon and nutrient export from collapsing upland permafrost
Benjamin W. Abbott,Benjamin W. Abbott,Jeremy B. Jones,Sarah E. Godsey,Julia R. Larouche,William B. Bowden +5 more
TL;DR: In this paper, the authors studied the effect of permafrost collapse on aquatic biogeochemical cycles and found that thermokarst caused substantial increases in dissolved organic carbon and other solute concentrations with a particularly large impact on inorganic nitrogen.
References
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