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| Titel |
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 |
| VerfasserIn |
R. Arruda, P. H. R. Calil, A. A. Bianchi, S. C. Doney, N. Gruber, I. Lima, G. Turi |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 19 ; Nr. 12, no. 19 (2015-10-12), S.5793-5809 |
| Datensatznummer |
250118121
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| Publikation (Nr.) |
 copernicus.org/bg-12-5793-2015.pdf |
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| Zusammenfassung |
| 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). |
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