COTOVICZ, Luiz; KNOPPERS, Bastiaan; BRANDINI, Nilva; POIRIER, Dominique; COSTA SANTOS, Suzan; ABRIL, Gwenaël

doi:10.1016/j.marpolbul.2017.10.064

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COTOVICZ, Luiz
Departamento de Geoquímica

KNOPPERS, Bastiaan
Departamento de Geoquímica

BRANDINI, Nilva
Programa de Pós-Graduação em Geografia - Universidade Federal do Rio Grande do Sul [POSGEA-UFRGS]

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Marine Pollution Bulletin. 2018-04, vol. 129, n° 2, p. 729 - 739

Résumé en anglais

The dynamics of the aragonite saturation state (Ωarag) were investigated in the eutrophic coastal waters of Guanabara Bay (RJ-Brazil). Large phytoplankton blooms stimulated by a high nutrient enrichment promoted the production of organic matter with strong uptake of dissolved inorganic carbon (DIC) in surface waters, lowering the concentrations of dissolved carbon dioxide (CO2aq), and increasing the pH, Ωarag and carbonate ion (CO32 −), especially during summer. The increase of Ωarag related to biological activity was also evident comparing the negative relationship between the Ωarag and the apparent utilization of oxygen (AOU), with a very close behavior between the slopes of the linear regression and the Redfield ratio. The lowest values of Ωarag were found at low-buffered waters in regions that receive direct discharges from domestic effluents and polluted rivers, with episodic evidences of corrosive waters (Ωarag < 1). This study showed that the eutrophication controlled the variations of Ωarag in Guanabara Bay.< Réduire

Mots clés en anglais

Carbonate chemistry

Coastal eutrophication

Coastal acidification

Phytoplankton blooms

Carbonate chemistry

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Aragonite saturation state in a tropical coastal embayment dominated by phytoplankton blooms (Guanabara Bay – Brazil)

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