Seasonal and interannual variability of the air–sea CO2 flux in the Atlantic sector of the Barents Sea |
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| Authors: | Abdirahman M Omar Truls Johannessen Are Olsen Staffan Kaltin Francisco Rey |
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| Institution: | aGeophysical Institute, University of Bergen, Allégaten 70, 5007 Bergen, Norway;bBjerknes Centre for Climate Research, University of Bergen, Allégaten 55, N-5007 Bergen, Norway;cDepartment of Analytical and Marine Chemistry, Göteborg University, Göteborg Sweden;dInstitute of Marine Research, P. O. Box 1870, Nordnes, NO-5817 Bergen, Norway |
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| Abstract: | The seasonal and interannual variability of the air–sea CO2 flux (F) in the Atlantic sector of the Barents Sea have been investigated. Data for seawater fugacity of CO2 (fCO2sw) acquired during five cruises in the region were used to identify and validate an empirical procedure to compute fCO2sw from phosphate (PO4), seawater temperature (T), and salinity (S). This procedure was then applied to time series data of T, S, and PO4 collected in the Barents Sea Opening during the period 1990–1999, and the resulting fCO2sw estimates were combined with data for the atmospheric mole fraction of CO2, sea level pressure, and wind speed to evaluate F.The results show that the Atlantic sector of the Barents Sea is an annual sink of atmospheric CO2. The monthly mean uptake increases nearly monotonically from 0.101 mol C m− 2 in midwinter to 0.656 mol C m− 2 in midfall before it gradually decreases to the winter value. Interannual variability in the monthly mean flux was evaluated for the winter, summer, and fall seasons and was found to be ± 0.071 mol C m− 2 month− 1. The variability is controlled mainly through combined variation of fCO2sw and wind speed. The annual mean uptake of atmospheric CO2 in the region was estimated to 4.27 ± 0.68 mol C m− 2. |
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| Keywords: | Barents Sea Carbon fluxes Partial pressure of CO2 Seasonal variability Interannual variability |
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