Rev. biol. mar. oceanogr. 50(3): 603-609

Nota Científica

Caracterización de los flujos de CO₂ y los parámetros asociados con el sistema de carbonato en el estuario Río Formoso, Brasil

This email address is being protected from spambots. You need JavaScript enabled to view it.^1,2, Moacyr Araujo^1,2, Manuel Flores Montes¹ y Nathalie Lefèvre^1,3

¹Department of Oceanography (DOCEAN), Federal University of Pernambuco (UFPE), Av. Arquitetura s/n, Cidade Universitária, CEP: 50740-550, Recife, Brazil

²Center for Risk Analysis and Environmental Modeling (CEERMA), Federal University of Pernambuco (UFPE), Av. Arquitetura s/n, Cidade Universitária, CEP: 50740-550, Recife, Brazil

³LOCEAN Laboratory, IRD, CNRS, MNHN, Sorbonne Universités (UPMC, Univ Paris 06), 4 Place Jussieu, 75005 Paris, France

  This email address is being protected from spambots. You need JavaScript enabled to view it.

Nine surface water surveys were performed in the Formoso estuary (Brazil) during 2012-2013 mainly in summer and winter periods and during spring tide. Temporal variations of temperature, salinity, phosphate, silicate, total alkalinity, dissolved inorganic carbon, partial pressure of CO₂ (pCO₂) and water-air CO₂ fluxes were analyzed. Low rates of water-air CO₂ fluxes (4.7 ± 8.0 mmol C m^-2 d^-1) were estimated despite the different climate conditions. pCO² values ranged from 190 to 988 matm. These values are lower than those observed in other tropical estuaries. CO₂ fluxes presented in this study contribute to the characterization of humid tropical estuarine systems, thus filling an important geographical information gap.

Key words:  CO₂ fluxes, carbon cycle, tropical estuary, Brazil