CP Climate of the Past CP Clim. Past 1814-9332 Copernicus Publications Göttingen, Germany 10.5194/cp-10-569-2014 Towards an improved organic carbon budget for the western Barents Sea shelf Pathirana I. 1 2 Knies J. 3 1 Felix M. 4 Mann U. 4 5 Geological Survey of Norway, 7491 Trondheim, Norway University of Tromsø, Department of Geology, 9011 Tromsø, Norway Centre for Arctic Gas Hydrate, Environment and Climate, University of Tromsø, 9037 Tromsø, Norway SINTEF Basin Modelling Department, 7465 Trondheim, Norway currently at: Statoil Research Center, Arkitekt Ebbells veg 10, 7005 Trondheim, Norway 21 03 2014 10 2 569 587 Copyright: © 2014 I. Pathirana et al. 2014 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://cp.copernicus.org/articles/10/569/2014/cp-10-569-2014.html The full text article is available as a PDF file from https://cp.copernicus.org/articles/10/569/2014/cp-10-569-2014.pdf

There is generally a lack of knowledge on how marine organic carbon accumulation is linked to vertical export and primary productivity patterns in the Arctic Ocean. Despite the fact that annual primary production in the Arctic has increased as a consequence of shrinking sea ice, its effect on flux, preservation, and accumulation of organic carbon is still not well understood. In this study, a multi-proxy geochemical and organic-sedimentological approach is coupled with organic facies modelling, focusing on regional calculations of carbon cycling and carbon burial on the western Barents Shelf between northern Scandinavia and Svalbard. OF-Mod 3-D, an organic facies modelling software tool, is used to reconstruct and quantify the marine and terrestrial organic carbon fractions and to make inferences about marine primary productivity changes across the marginal ice zone (MIZ). By calibrating the model against an extensive set of sediment surface samples, we improve the Holocene organic carbon budget for ice-free and seasonally ice-covered areas in the western Barents Sea. The results show that higher organic carbon accumulation rates in the MIZ are best explained by enhanced surface water productivity compared to ice-free regions, implying that shrinking sea ice may reveal a significant effect on the overall organic carbon storage capacity of the western Barents Sea shelf.

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