CO2 fluxes at the water-atmosphere interface in fluvial environments: an overview of studies in Brazilian rivers

  • Daniela Vasconcelos Machado Instituto de Geociências. Departamento de Geologia. Universidade Federal do Rio De Janeiro (UFRJ), Avenida Athos da Silveira Ramos, n° 274, CEP: 21941-916, Rio de Janeiro, RJ, Brazil.
  • Gerson Cardoso da Silva Júnior Instituto de Geociências. Departamento de Geologia. Universidade Federal do Rio De Janeiro (UFRJ), Avenida Athos da Silveira Ramos, n° 274, CEP: 21941-916, Rio de Janeiro, RJ, Brazil.
  • Eduardo Duarte Marques Divisão de Geoquímica. Serviço Geológico do Brasil (SGB), Avenida Brasil, n° 1731, CEP: 30140-002, Belo Horizonte, MG, Brazil.
  • Emmanoel Vieira Silva-Filho Instituto de Química. Departamento de Geoquímica. Universidade Federal Fluminense (UFF), Outeiro de São João Batista, s/n, Campus do Valonguinho, CEP: 24020-141, Niterói, RJ, Brazil.
DOI: https://doi.org/10.4136/ambi-agua.2921

Abstract

Recent advances in Brazilian scientific production on CO2 fluxes at the water-atmosphere interface in rivers were reviewed, including estimates of CO2 partial pressure and fluxes. A total of 17 studies were reviewed. We compiled information regarding the location studied, the methodology used by each author, and the values of CO2 partial pressure (pCO2), CO2 fluxes (FCO2), and gas exchange coefficient (k) found in each region. The results were spatialized and synthesized. The important role of fluxes in CO2 degassing and their influence on climate change, as well as the global lack of data on these environments, were the main motivations for this study. The information was scarce, and most studies are focused on the Amazon Basin. However, high-resolution mapping of CO2 fluxes, at the scale of micro basins and streams, proved to be scarce. We emphasize, therefore, the importance of further studies in the country including other hydrographic regions, and in high resolution. These studies would add to our knowledge of how natural and anthropic processes influence CO2 flux, in addition to providing better estimates in tropical river systems.

Keywords: climate change, CO2 emission, CO2 partial pressure.


Published
08/09/2023
Issue
Vol. 18 (2023)
Section
Papers

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