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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Increased plant productivity in Alaskan tundra as a result of experimental warming of soil and permafrost
TL;DR: The response of tundra plant communities to warming temperatures is of critical concern because permafrost ecosystems play a key role in global carbon storage, and climate-induced ecological shifts in the plant community will affect the transfer of carbon-dioxide between biological and atmospheric pools as mentioned in this paper.
Journal ArticleDOI
Methane dynamics regulated by microbial community response to permafrost thaw
C. K. McCalley,Ben J. Woodcroft,S. B. Hodgkins,Richard Wehr,Eun Hae Kim,Rhiannon Mondav,Patrick M. Crill,Jeffrey P. Chanton,Virginia I. Rich,Gene W. Tyson,Scott R. Saleska +10 more
TL;DR: It is shown that changes in vegetation and increasing methane emissions with permafrost thaw are associated with a switch from hydrogenotrophic to partly acetoclastic methanogenesis, resulting in a large shift in the δ13C signature (10–15‰) of emitted methane.
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The impact of the permafrost carbon feedback on global climate
Kevin Schaefer,Hugues Lantuit,Hugues Lantuit,Vladimir E. Romanovsky,Edward A. G. Schuur,Ronald Witt +5 more
TL;DR: The permafrost carbon feedback feedback (PCF) is the amplification of surface warming due to CO2 and CH4 emissions from thawing and de-degrading permaffrost.
Journal ArticleDOI
Activation of old carbon by erosion of coastal and subsea permafrost in Arctic Siberia
Jorien E. Vonk,Jorien E. Vonk,Laura Sánchez-García,Laura Sánchez-García,B. E. van Dongen,B. E. van Dongen,V. Alling,V. Alling,Denis Kosmach,A. N. Charkin,Igor Semiletov,Igor Semiletov,Oleg V. Dudarev,Natalia Shakhova,Natalia Shakhova,Per Roos,Timothy I. Eglinton,August Andersson,Örjan Gustafsson +18 more
TL;DR: Inverse modelling of the dual-carbon isotope composition of organic carbon accumulating in ESAS surface sediments, using Monte Carlo simulations to account for uncertainties, suggests that 44 ± 10 teragrams of old carbon is activated annually from Ice Complex permafrost, an order of magnitude more than has been suggested by previous studies.
Journal ArticleDOI
Changes in forest productivity across Alaska consistent with biome shift
Pieter S. A. Beck,Glenn P. Juday,Claire Alix,Valerie A. Barber,Stephen E. Winslow,Emily E. Sousa,Patricia Heiser,James D. Herriges,Scott J. Goetz +8 more
TL;DR: In this article, the authors evaluated changes in forest productivity since 1982 across boreal Alaska by linking satellite estimates of primary productivity and a large tree-ring data set, and found consistent growth increases at the boreal tundra ecotones that contrast with drought-induced productivity declines throughout interior Alaska.
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