期刊
MARINE POLLUTION BULLETIN
卷 129, 期 2, 页码 729-739出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2017.10.064
关键词
Carbonate chemistry; Coastal eutrophication; Coastal acidification; Phytoplankton blooms
资金
- No Frontier Sciences Program of the Brazilian National Council of Research and Development (CNPq-Pve) [401.726/2012-6]
- FAPERJ Project [26/111.190/2011]
The dynamics of the aragonite saturation state (Omega(arag)) 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, Omega(arag) and carbonate ion (CO32- especially during summer. The increase of Omega(arag) related to biological activity was also evident comparing the negative relationship between the Omega(arag) 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 Omega(arag) were found at low-buffered waters in regions that receive direct discharges from domestic effluents and polluted rivers, with episodic evidences of corrosive waters (Omega(arag) < 1). This study showed that the eutrophication controlled the variations of Omega(arag) in Guanabara Bay.
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