Air-sea CO2 fluxes and the controls on ocean surface pCO2 seasonal variability in the coastal and open-ocean southwestern Atlantic Ocean: A modeling study

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Author(s) Arruda, R., Calil, Paulo H.R., Bianchi, Alejandro A., Doney, Scott C., Gruber, Nicolas, Lima, Ivan, Turi, G.
Publication Type Journal Items, Publication Status: Published
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Title Air-sea CO2 fluxes and the controls on ocean surface pCO2 seasonal variability in the coastal and open-ocean southwestern Atlantic Ocean: A modeling study
Author(s) Arruda, R.
Calil, Paulo H.R.
Bianchi, Alejandro A.
Doney, Scott C.
Gruber, Nicolas
Lima, Ivan
Turi, G.
Journal or Series Title Biogeosciences
Volume Number 12
Issue Number 19
Start Page 5793
End Page 5809
ISSN 1726-4170
1726-4189
Publisher Copernicus
Publication Place Göttingen
Publication Date 2015-10
Abstract 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).
DOI 10.5194/bg-12-5793-2015
Additional Notes Published online 19 May 2015
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
Organisational Unit(s)
NEBIS System Number 006289717
Source Database ID SCOPUS-84944256699
WOS-000362972200015
FORM-1454057436
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@article{rrd2015,
  author = "Arruda, R. and Calil, Paulo H.R. and Bianchi, Alejandro A. and Doney, Scott C. and Gruber, Nicolas and Lima, Ivan and Turi, G.",
  title = "{A}ir-sea {C}{O}2 fluxes and the controls on ocean surface p{C}{O}2 seasonal variability in the coastal and open-ocean southwestern {A}tlantic {O}cean: {A} modeling study",
  journal = "Biogeosciences",
  year = 2015,
  volume = "12",
  number = "19",
  pages = "5793--5809",
  month = oct,
}


E-Citations record created: Tue, 27 Oct 2015, 09:56:24 CET