A model of the Arctic Ocean carbon cycle
A three dimensional model of Arctic Ocean circulation and mixing, with a horizontal resolution of 18 km, is overlain by a biogeochemical model resolving the physical, chemical and biological transport and transformations of phosphorus, alkalinity, oxygen and carbon, including the air-sea exchange of...
| Main Authors: | , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Published: |
American Geophysical Union (AGU)
2018
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| Online Access: | http://hdl.handle.net/1721.1/118332 https://orcid.org/0000-0002-3102-0341 https://orcid.org/0000-0003-3417-9056 |
| Summary: | A three dimensional model of Arctic Ocean circulation and mixing, with a horizontal resolution of 18 km, is overlain by a biogeochemical model resolving the physical, chemical and biological transport and transformations of phosphorus, alkalinity, oxygen and carbon, including the air-sea exchange of dissolved gases and the riverine delivery of dissolved organic carbon. The model qualitatively captures the observed regional and seasonal trends in surface ocean PO₄, dissolved inorganic carbon, total alkalinity, and pCO₂. Integrated annually, over the basin, the model suggests a net annual uptake of 59 Tg C a⁻¹, within the range of published estimates based on the extrapolation of local observations (20-199 Tg C a⁻¹). This flux is attributable to the cooling (increasing solubility) of waters moving into the basin, mainly from the subpolar North Atlantic. The air-sea flux is regulated seasonally and regionally by sea-ice cover, which modulates both air-sea gas transfer and the photosynthetic production of organic matter, and by the delivery of riverine dissolved organic carbon (RDOC), which drive the regional contrasts in pCO₂ between Eurasian and North American coastal waters. Integrated over the basin, the delivery and remineralization of RDOC reduces the net oceanic CO₂ uptake by ∼10%. |
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