Publication Date:
2022-05-25
Description:
© The Author(s), 2015. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Biogeosciences 12 (2015): 5793-5809, doi:10.5194/bg-12-5793-2015.
Description:
We use an eddy-resolving, regional ocean biogeochemical model to investigate the main variables and processes responsible for the climatological spatio-temporal variability of pCO2 and the air-sea CO2 fluxes in the southwestern Atlantic Ocean. Overall, the region acts as a sink of atmospheric CO2 south of 30° S, and is close to equilibrium with the atmospheric CO2 to the north. On the shelves, the ocean acts as a weak source of CO2, except for the mid/outer shelves of Patagonia, which act as sinks. In contrast, the inner shelves and the low latitude open ocean of the southwestern Atlantic represent source regions. Observed nearshore-to-offshore and meridional pCO2 gradients are well represented by our simulation. A sensitivity analysis shows the importance of the counteracting effects of temperature and dissolved inorganic carbon (DIC) in controlling the seasonal variability of pCO2. Biological production and solubility are the main processes regulating pCO2, with biological production being particularly important on the shelves. The role of mixing/stratification in modulating DIC, and therefore surface pCO2, is shown in a vertical profile at the location of the Ocean Observatories Initiative (OOI) site in the Argentine Basin (42° S, 42° W).
Description:
P. H. R. Calil acknowledges support from
the Brazilian agencies Conselho Nacional de Desenvolvimento
Científico e Tecnológico (CNPq), grants 483112/2012-7 and
307385/2013-2, and the Coordenação de Aperfeiçoamento de Pessoal
de Nível Superior (CAPES Process 23038.004299/2014-53).
R. Arruda acknowledges support from a CAPES scholarship.
S. C. Doney and I. Lima acknowledge support from the National
Science Foundation (NSF AGS-1048827). N. Gruber and G. Turi
received support from ETH Zurich and from the EU FP7 project
CarboChange (264879).
Repository Name:
Woods Hole Open Access Server
Type:
Article
Format:
application/pdf
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