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

Abstract：

: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.

journal_name

Mar Pollut Bull

journal_title

Marine pollution bulletin

authors

Cotovicz LC Jr,Knoppers BA,Brandini N,Poirier D,Costa Santos SJ,Abril G

doi

10.1016/j.marpolbul.2017.10.064

subject

Has Abstract

pub_date

2018-04-01 00:00:00

pages

729-739

issue

2

eissn

0025-326X

issn

1879-3363

pii

S0025-326X(17)30910-4

journal_volume

129

pub_type

杂志文章

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