A model of the Arctic Ocean carbon cycle

• Main Authors: Menemenlis, D. (Author), McClelland, J. W. (Author), Peterson, B. J. (Author), Key, R. M. (Author), Manizza, Manfredi (Contributor), Follows, Michael J (Contributor), Dutkiewicz, Stephanie (Contributor), Hill, Christopher N (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences (Contributor)
• Format: Article
• Language: English
• Published: American Geophysical Union (AGU), 2018-10-02T14:54:49Z.
• Subjects: Article
• Online Access: Get fulltext

 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%.