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A seasonal tropical sink for atmospheric CO2 in the Atlantic ocean: the role of the Amazon River discharge by J.F Ternon; C Oudot; A Dessier; D Diverres is a Earth and Planetary Sciences article available to read on EtoBox.

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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 fugacity levels. Near the 2 Ž . coast of South America where the salinities are the lowest S -20 , the fugacity of oceanic CO decreases down to 150 2 matm and the shelf area acts as a significant sink for atmospheric CO . The dilution effect by low-salinity water only partly 2 accounts for the decrease in CO , and the biological production in the Amazon Plume water enriched in nutrients lowers 2 dissolved inorganic carbon and decreases the f CO by nearly 30%. The low-salinity Amazon water tongue spreads 2 ## Ž . northwestwards along the coast by the North Brazil Current NBC and is deflected eastwards north of 58N in the NBC Ž . retroflection in summer. Consequently, the low-salinity and oceanic f CO below the atmospheric f CO level signatures 2 2 may extend more than 2000 km eastwards. The impact of the river outflow on the air-sea CO exchanges in the western 2 Ž . region is demonstrated by using the climatologies of the sea surface salinity SSS to estimate the magnitude of the

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Author

J.F Ternon; C Oudot; A Dessier; D Diverres

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0304-4203)

Published

2000

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)