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Bounding cross-shel...
Bounding cross-shelf transport time and degradation in Siberian-Arctic land-ocean carbon transfer
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- Bröder, Lisa (author)
- Stockholms universitet,Institutionen för miljövetenskap och analytisk kemi
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- Tesi, Tommaso (author)
- Stockholms universitet,Institutionen för miljövetenskap och analytisk kemi,Institute of Marine Sciences - National Research Council, Italy
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- Andersson, August (author)
- Stockholms universitet,Institutionen för miljövetenskap och analytisk kemi
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Semiletov, Igor (author)
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- Gustafsson, Örjan (author)
- Stockholms universitet,Institutionen för miljövetenskap och analytisk kemi
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(creator_code:org_t)
- 2018-02-23
- 2018
- English.
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In: Nature Communications. - : Springer Science and Business Media LLC. - 2041-1723. ; 9
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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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- 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.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Keyword
- Carbon cycle
Publication and Content Type
- ref (subject category)
- art (subject category)
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