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Carbon cycling on the East Siberian Arctic Shelf: a change in air-sea CO2 flux induced by mineralization of terrestrial organic carbon
Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre, Baltic Nest Institute.ORCID iD: 0000-0002-4215-9322
Stockholm University, Faculty of Science, Stockholm University Baltic Sea Centre. Stockholm University, Faculty of Science, Department of Environmental Science and Analytical Chemistry.ORCID iD: 0000-0002-0649-5599
Stockholm University, Faculty of Science, Department of Geological Sciences.ORCID iD: 0000-0003-1004-5213
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Abstract [en]

Measurements from the SWERUS-C3 and ISSS-08 Arctic expeditions were used to calibrate and validate a new physical-biogeochemical model developed to quantify key carbon cycling processes on the East Siberian Arctic Shelf (ESAS). The model was used in a series of experimental simulations with the specific aim to investigate the pathways of terrestrial dissolved and particulate organic carbon (DOCter and POCter) supplied to the shelf. Rivers supply on average 8.5 Tg C yr-1 dissolved inorganic carbon (DIC), and further 8.5 and 1.1 Tg C yr-1 DOCter and POCter respectively. Based on observed and simulated DOC concentrations and stable isotope values (δ13CDOC) in shelf waters, we estimate that only some 20% of the riverine DOCter is labile. According to our model results, an additional supply of approximately 14 Tg C yr-1 eroded labile POCter is however required to describe the observed stable isotope values of DIC (δ13  CDIC). Degradation of riverine DOCter and POCter results in a 1.8 Tg C yr-1 reduction in the uptake of atmospheric CO2, while degradation of eroded POCter results in an additional 10 Tg C yr-1 reduction. Our calculations indicate nevertheless that the ESAS is an overall small net sink for atmospheric CO2 (1.7 Tg C yr-1 ). The external carbon sources are largely compensated by a net export from the shelf to the Arctic Ocean (31 Tg C yr-1 ), and to a smaller degree by a permanent burial in the sediments (2.7 Tg C yr-1 ).

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Natural Sciences Earth and Related Environmental Sciences
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URN: urn:nbn:se:su:diva-151402DOI: 10.5194/bg-2017-115OAI: oai:DiVA.org:su-151402DiVA: diva2:1172928
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Knut and Alice Wallenberg FoundationSwedish Agency for Marine and Water Management
Available from: 2018-01-11 Created: 2018-01-11 Last updated: 2018-01-11

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Gustafsson, ErikHumborg, ChristophStranne, ChristianGeibel, Marc C.Mörth, Carl-MagnusSundbom, MarcusGustafsson, Bo G.
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Baltic Nest InstituteStockholm University Baltic Sea CentreDepartment of Environmental Science and Analytical ChemistryDepartment of Geological Sciences
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