Faust, JC orcid.org/0000-0001-8177-7097, Stevenson, MA, Abbott, GD et al. (7 more authors) (2020) Does Arctic warming reduce preservation of organic matter in Barents Sea sediments? Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 378 (2181). ISSN 1364-503X
Abstract
Over the last few decades, the Barents Sea experienced substantial warming, an expansion of relatively warm Atlantic water and a reduction in sea ice cover. This environmental change forces the entire Barents Sea ecosystem to adapt and restructure and therefore changes in pelagic–benthic coupling, organic matter sedimentation and long-term carbon sequestration are expected. Here we combine new and existing organic and inorganic geochemical surface sediment data from the western Barents Sea and show a clear link between the modern ecosystem structure, sea ice cover and the organic carbon and CaCO3 contents in Barents Sea surface sediments. Furthermore, we discuss the sources of total and reactive iron phases and evaluate the spatial distribution of organic carbon bound to reactive iron. Consistent with a recent global estimate we find that on average 21.0 ± 8.3 per cent of the total organic carbon is associated to reactive iron (fOC-FeR) in Barents Sea surface sediments. The spatial distribution of fOC-FeR, however, seems to be unrelated to sea ice cover, Atlantic water inflow or proximity to land. Future Arctic warming might, therefore, neither increase nor decrease the burial rates of iron-associated organic carbon. However, our results also imply that ongoing sea ice reduction and the associated alteration of vertical carbon fluxes might cause accompanied shifts in the Barents Sea surface sedimentary organic carbon content, which might result in overall reduced carbon sequestration in the future.
This article is part of the theme issue ‘The changing Arctic Ocean: consequences for biological communities, biogeochemical processes and ecosystem functioning’.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 The Author(s), Published by the Royal Society. All rights reserved. This is an author produced version of an article accepted for publication in Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | carbon cycle; marine surface sediments; organic carbon bound to reactive iron; Arctic Ocean; geochemical sediment composition; Barents Sea |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Earth Surface Science Institute (ESSI) (Leeds) The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Institute for Applied Geosciences (IAG) (Leeds) |
Funding Information: | Funder Grant number NERC (Natural Environment Research Council) NE/P006493/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 03 Jul 2020 11:32 |
Last Modified: | 18 Sep 2020 12:34 |
Status: | Published |
Publisher: | The Royal Society |
Identification Number: | 10.1098/rsta.2019.0364 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:162662 |