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Study of the carbon system in two Brazilian estuarias (MA - SP), with emphasis on total alkalinity and differentiated hydrodynamics

Grant number: 22/05823-4
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): September 01, 2022
Effective date (End): July 31, 2024
Field of knowledge:Physical Sciences and Mathematics - Oceanography - Chemical Oceanography
Principal Investigator:Elisabete de Santis Braga da Graça Saraiva
Grantee:Antonio Jeferson Muniz Almeida
Host Institution: Instituto Oceanográfico (IO). Universidade de São Paulo (USP). São Paulo , SP, Brazil


Estuaries, the main target of this study, are characterized as semi-enclosed coastal water bodies that have free connection with the open sea, within which seawater is gradually diluted by freshwater from land drainage. Estuaries are ecosystems that export large amounts of dissolved inorganic carbon (DIC), total alkalinity (TA) and dissolved organic carbon (DOC), being of great importance in the cycling of essential elements for the production of life in the oceans. In this context, this study will be applied in two different areas, one located on the northeast coast of the state of Maranhão, in the estuarine system of the municipality of Raposa and another on the south coast of the state of São Paulo, in the estuarine-lagoon complex of Cananéia-Iguape- Macaw The two systems have different characteristics in terms of climate and, above all, tidal dynamics, in addition to presenting different degrees of conservation, they are also subject to the exploitation of natural resources and different types of anthropogenic impacts. The present study aims to know the variation of the carbon system based on the determination of its parameters such as pH, pCO2 and mainly the total alkalinity, in two systems, submitted to micro and macro tides, in order to observe the behavior nature of these inorganic components in these different systems and their potential to assimilate disturbances resulting from anthropic actions and climate change in the face of a pH reduction process and the retention and export of inorganic carbon. This is the development of a comparative study that should contribute to a unprecedented knowledge for the two Brazilian areas with contrasting hydrodynamics and with great environmental, social, cultural and economic importance. (AU)

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