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Organic carbon remo...
Organic carbon remobilized from thawing permafrost is resequestered by reactive iron on the Eurasian Arctic Shelf
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- Salvadó, Joan A. (author)
- Stockholms universitet,Institutionen för miljövetenskap och analytisk kemi,Department of Environmental Science and Analytical Chemistry, ACES, Stockholm University
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- Tesi, Tommaso (author)
- Stockholms universitet,Institutionen för miljövetenskap och analytisk kemi,Institute of Marine Science (ISMAR), Italy,Department of Environmental Science and Analytical Chemistry, ACES, Stockholm University
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- Andersson, August (author)
- Stockholms universitet,Institutionen för miljövetenskap och analytisk kemi
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- Ingri, Johan (author)
- Luleå tekniska universitet,Geovetenskap och miljöteknik
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- Dudarev, Oleg V. (author)
- Pacific Oceanological Institute, Russian Academy of Science, Vladivostok, The National Research Tomsk Polytechnic University
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- Semiletov, Igor P. (author)
- International Arctic Research Center, University of Alaska Fairbanks, University of Alaska, The National Research Tomsk Polytechnic University
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- Gustafsson, Örjan (author)
- Stockholms universitet,Institutionen för miljövetenskap och analytisk kemi,Swedish Museum of Natural History, Institute of Applied Environmental Research (ITM), Stockholm University, Department of Environmental Science and Analytical Chemistry, ACES, Stockholm University
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(creator_code:org_t)
- 2015
- 2015
- English.
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In: Geophysical Research Letters. - 0094-8276 .- 1944-8007. ; 42:19, s. 8122-8130
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- Given the potential for permafrost carbon (PF/C)-climate feedbacks in the Siberian-Arctic land-ocean system, there is a need for understanding the fate of thawed-out PF/C. Here we show that the sequestration of OC by reactive iron (OC-Fe) ranges between 0.5 and 22% on the Eurasian Arctic Shelf, with higher values in the Kara Sea (KS) (186%) and the Laptev Sea (LS) (144%). The C-14/C-13 signatures of the OC-Fe are substantially older and more terrestrial than the bulk sediment OC in the LS but younger and more dominated by marine plankton sources in the East Siberian Sea (ESS). Statistical source apportionment modeling reveal that reactive iron phases resequestered 155% of thawing PF/C in the LS and 6.45% in the ESS, derived from both coastal erosion of ice complex deposit and thawing topsoil. This Fe-associated trap of PF/C constitutes a reduction of the degradation/outgassing and thus also an attenuation of the PF/C-climate feedback.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
Keyword
- permafrost
- carbon sequestration
- carbon cycle
- reactive iron
- Applied Geology
Publication and Content Type
- ref (subject category)
- art (subject category)
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