Carbon cycling on the East Siberian Arctic Shelf – a change in air-sea CO2 flux induced by mineralization of terrestrial organic carbon
- 1Baltic Nest Institute, Stockholm University, Stockholm, 10691, Sweden
- 2Baltic Sea Centre, Stockholm University, Stockholm, 10691, Sweden
- 3Department of Environmental Science and Analytical Chemistry, Stockholm University, Stockholm, 10691, Sweden
- 4Department of Marine Sciences, University of Gothenburg, Gothenburg, 40530, Sweden
- 5Department of Geological Sciences, Stockholm University, Stockholm, 10691, Sweden
- 6Bolin Centre for Climate Research, Stockholm University, Stockholm, 10691, Sweden
- 7Center for Coastal and Ocean Mapping, University of New Hampshire, Durham, 03824, New Hampshire, USA
- 8University of Alaska Fairbanks, International Arctic Research Center, Fairbanks, Alaska, 99775-7320, USA
- 9Tomsk Polytechnic University, Tomsk, 634050, Russia
- 10Russian Academy of Sciences, Pacific Oceanological Institute, Vladivostok, 690041, Russia
- 1Baltic Nest Institute, Stockholm University, Stockholm, 10691, Sweden
- 2Baltic Sea Centre, Stockholm University, Stockholm, 10691, Sweden
- 3Department of Environmental Science and Analytical Chemistry, Stockholm University, Stockholm, 10691, Sweden
- 4Department of Marine Sciences, University of Gothenburg, Gothenburg, 40530, Sweden
- 5Department of Geological Sciences, Stockholm University, Stockholm, 10691, Sweden
- 6Bolin Centre for Climate Research, Stockholm University, Stockholm, 10691, Sweden
- 7Center for Coastal and Ocean Mapping, University of New Hampshire, Durham, 03824, New Hampshire, USA
- 8University of Alaska Fairbanks, International Arctic Research Center, Fairbanks, Alaska, 99775-7320, USA
- 9Tomsk Polytechnic University, Tomsk, 634050, Russia
- 10Russian Academy of Sciences, Pacific Oceanological Institute, Vladivostok, 690041, Russia
Abstract. 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 (δ13CDIC). 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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Erik Gustafsson et al.
Interactive discussion


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RC1: 'bg-2017-115', Anonymous Referee #1, 17 May 2017
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RC2: 'bg-2017-115', Anonymous Referee #2, 19 Jun 2017
Interactive discussion


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RC1: 'bg-2017-115', Anonymous Referee #1, 17 May 2017
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RC2: 'bg-2017-115', Anonymous Referee #2, 19 Jun 2017
Erik Gustafsson et al.
Erik Gustafsson et al.
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