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Strong sensitivity of Southern Ocean carbon uptake and nutrient cycling to wind stirring

TitleStrong sensitivity of Southern Ocean carbon uptake and nutrient cycling to wind stirring
Publication TypeJournal Article
Year of Publication2014
AuthorsRodgers K.B, Aumont O., Fletcher S.EM, Plancherel Y., Bopp L., Montegut C.D, Iudicone D., Keeling RF, Madec G., Wanninkhof R
JournalBiogeosciences
Volume11
Pagination4077-4098
Date Published2014/08
Type of ArticleArticle
ISBN Number1726-4170
Accession NumberWOS:000341104400003
Keywordsatmospheric oxygen; circulation; co2; driven; gas-exchange; general-circulation model; layer; recent climate-change; sea; thermohaline; transport
Abstract

Here we test the hypothesis that winds have an important role in determining the rate of exchange of CO2 between the atmosphere and ocean through wind stirring over the Southern Ocean. This is tested with a sensitivity study using an ad hoc parameterization of wind stirring in an ocean carbon cycle model, where the objective is to identify the way in which perturbations to the vertical density structure of the planetary boundary in the ocean impacts the carbon cycle and ocean biogeochemistry. Wind stirring leads to reduced uptake of CO2 by the Southern Ocean over the period 2000-2006, with a relative reduction with wind stirring on the order of 0.9 Pg C yr(-1) over the region south of 45 degrees S. This impacts not only the mean carbon uptake, but also the phasing of the seasonal cycle of carbon and other ocean biogeochemical tracers. Enhanced wind stirring delays the seasonal onset of stratification, and this has large impacts on both entrainment and the biological pump. It is also found that there is a strong reduction on the order of 25-30% in the concentrations of NO3 exported in Subantarctic Mode Water (SAMW) to wind stirring. This finds expression not only locally over the Southern Ocean, but also over larger scales through the impact on advected nutrients. In summary, the large sensitivity identified with the ad hoc wind stirring parameterization offers support for the importance of wind stirring for global ocean biogeochemistry through its impact over the Southern Ocean.

DOI10.5194/bg-11-4077-2014
Student Publication: 
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