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• W2107598384 abstract "Abstract Sea ice is an active source or a sink for carbon dioxide (CO 2 ), although to what extent is not clear. Here, we analyze CO 2 dynamics within sea ice using a one‐dimensional halothermodynamic sea ice model including gas physics and carbon biogeochemistry. The ice‐ocean fluxes, and vertical transport, of total dissolved inorganic carbon (DIC) and total alkalinity (TA) are represented using fluid transport equations. Carbonate chemistry, the consumption, and release of CO 2 by primary production and respiration, the precipitation and dissolution of ikaite (CaCO 3 ·6H 2 O) and ice‐air CO 2 fluxes, are also included. The model is evaluated using observations from a 6 month field study at Point Barrow, Alaska, and an ice‐tank experiment. At Barrow, results show that the DIC budget is mainly driven by physical processes, wheras brine‐air CO 2 fluxes, ikaite formation, and net primary production, are secondary factors. In terms of ice‐atmosphere CO 2 exchanges, sea ice is a net CO 2 source and sink in winter and summer, respectively. The formulation of the ice‐atmosphere CO 2 flux impacts the simulated near‐surface CO 2 partial pressure ( p CO 2 ), but not the DIC budget. Because the simulated ice‐atmosphere CO 2 fluxes are limited by DIC stocks, and therefore <2 mmol m −2 d −1 , we argue that the observed much larger CO 2 fluxes from eddy covariance retrievals cannot be explained by a sea ice direct source and must involve other processes or other sources of CO 2 . Finally, the simulations suggest that near‐surface TA/DIC ratios of ∼2, sometimes used as an indicator of calcification, would rather suggest outgassing." @default.
• W2107598384 created "2016-06-24" @default.
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• W2107598384 date "2015-01-01" @default.
• W2107598384 modified "2023-10-10" @default.
• W2107598384 title "Drivers of inorganic carbon dynamics in first-year sea ice: A model study" @default.
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• W2107598384 doi "https://doi.org/10.1002/2014jc010388" @default.
• W2107598384 hasPublicationYear "2015" @default.
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