A seasonal tropical sink for atmospheric CO sub(2) in the Atlantic ocean: the role of the Amazon River discharge

A seasonal tropical sink for atmospheric CO sub(2) in the Atlantic ocean: the role of the Amazon River discharge

In the western Equatorial Atlantic ocean, near-surface observations show that during summertime, the low-salinity oceanic water, arising from mixing with the Amazon River discharge at the equator, has low CO sub(2) fugacity levels. Near the coast of South America where the salinities are the lowest...

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Veröffentlicht in:Marine chemistry 2000-01, Vol.68 (3), p.183-201
Hauptverfasser: Ternon, J F, Oudot, C, Dessier, A, Diverres, D
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creator Ternon, J F
Oudot, C
Dessier, A
Diverres, D
description In the western Equatorial Atlantic ocean, near-surface observations show that during summertime, the low-salinity oceanic water, arising from mixing with the Amazon River discharge at the equator, has low CO sub(2) fugacity levels. Near the coast of South America where the salinities are the lowest (S
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Near the coast of South America where the salinities are the lowest (S&lt;20), the fugacity of oceanic CO sub(2) decreases down to 150 mu atm and the shelf area acts as a significant sink for atmospheric CO sub(2). The dilution effect by low-salinity water only partly accounts for the decrease in CO sub(2), and the biological production in the Amazon Plume water enriched in nutrients lowers dissolved inorganic carbon and decreases the fCO sub(2) by nearly 30%. The low-salinity Amazon water tongue spreads northwestwards along the coast by the North Brazil Current (NBC) and is deflected eastwards north of 5 degree N in the NBC retroflection in summer. Consequently, the low-salinity and oceanic fCO sub(2) (below the atmospheric fCO sub(2) level) signatures may extend more than 2000 km eastwards. The impact of the river outflow on the air-sea CO sub(2) exchanges in the western region is demonstrated by using the climatologies of the sea surface salinity (SSS) to estimate the magnitude of the annual net CO sub(2) flux in the western part of the Equatorial Atlantic. 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title A seasonal tropical sink for atmospheric CO sub(2) in the Atlantic ocean: the role of the Amazon River discharge
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