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Bounding cross-shelf transport time and degradation in Siberian-Arctic land-ocean carbon transfer
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 Sciences - National Research Council, Italy.ORCID iD: 0000-0002-1686-3375
Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.
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Number of Authors: 52018 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 9, article id 806Article in journal (Refereed) Published
Abstract [en]

The burial of terrestrial organic carbon (terrOC) in marine sediments contributes to the regulation of atmospheric CO2 on geological timescales and may mitigate positive feedback to present-day climate warming. However, the fate of terrOC in marine settings is debated, with uncertainties regarding its degradation during transport. Here, we employ compound-specific radiocarbon analyses of terrestrial biomarkers to determine cross-shelf transport times. For the World's largest marginal sea, the East Siberian Arctic shelf, transport requires 3600 +/- 300 years for the 600 km from the Lena River to the Laptev Sea shelf edge. TerrOC was reduced by similar to 85% during transit resulting in a degradation rate constant of 2.4 +/- 0.6 kyr(-1). Hence, terrOC degradation during cross-shelf transport constitutes a carbon source to the atmosphere over millennial time. For the contemporary carbon cycle on the other hand, slow terrOC degradation brings considerable attenuation of the decadal-centennial permafrost carbon-climate feedback caused by global warming.

Place, publisher, year, edition, pages
2018. Vol. 9, article id 806
Keywords [en]
Carbon cycle
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-154849DOI: 10.1038/s41467-018-03192-1ISI: 000425935100019PubMedID: 29476050OAI: oai:DiVA.org:su-154849DiVA, id: diva2:1195806
Available from: 2018-04-06 Created: 2018-04-06 Last updated: 2018-04-06Bibliographically approved

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Bröder, LisaTesi, TommasoAndersson, AugustGustafsson, Örjan
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