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Organic carbon remobilized from thawing permafrost is resequestered by reactive iron on the Eurasian Arctic Shelf
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry. Institute of Marine Science (ISMAR), Italy.
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
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Number of Authors: 7
2015 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 42, no 19, 8122-8130 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2015. Vol. 42, no 19, 8122-8130 p.
Keyword [en]
permafrost, carbon sequestration, carbon cycle, reactive iron
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-123531DOI: 10.1002/2015GL066058ISI: 000363695500033OAI: oai:DiVA.org:su-123531DiVA: diva2:874606
Available from: 2015-11-27 Created: 2015-11-27 Last updated: 2015-11-27Bibliographically approved

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Salvadó, Joan A.Andersson, AugustGustafsson, Örjan
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