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Carbon dioxide dynamics in the tropical Ebrié lagoon (Ivory Coast)

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Academic year: 2021

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Carbon dioxide dynamics in the tropical Ebrié lagoon

(Ivory coast)

Y.J.M. Koné (1), B. Delille(1), A.V. Borges(1)

(1) Université de Liège, Belgium (alberto.borges@ulg.ac.be)

The partial pressure of CO2(pCO2) was measured during two different seasons in the

Ebrié lagoon (Ivory Coast). Surface-weighted average pCO2in the lagoon decreased

from 3570 ppm during the rainy season down to 1470 ppm during the dry season. De-spite a large westwards decrease of pCO2, the whole lagoon was always oversaturated

in CO2with respect to the atmosphere. pCO2dynamics in Ebrié lagoon appears to be

dominated by large exchanges between freshwater inputs from the Comoé River and seawater that enters in the central part of the lagoon through the Vridi Canal. Estimated air-water CO2fluxes ranged from 71.5 mmol C m−2day−1 during the dry season to

135.1 mmol C m−2 day−1during the rainy season. Ebrié lagoon acted therefore as a source of CO2to the atmosphere during the two sampling periods. A more exhaustive

investigation of the air-water fluxes of CO2in various lagoons is needed particularly

at tropical latitudes in order to estimate the potential importance of these ecosystems in the carbon cycle of the coastal ocean.

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