Dinâmica do Carbono Inorgânico Dissolvido nos Rios Teles Pires e Cristalino na Bacia Amazônica

Higo José Dalmagro, Kelli Cristina Aparecida Munhoz, Maria de Fátima F. Lamy Rasera, Cleber Ibraim Salimon, Alex Vladimir Krusche, Cristiane Akemi Umetsu, Rosalvo Duarte Rosa, Ricardo Keichi Umetsu, Leandro Gomes Almeida, Vanessa Aparecida Santos, Luciana Sanches, José de Souza Nogueira

Abstract


The rivers are extremely important in the carbon cycle, either inthe CO2 out gassing flows or carbon exporters to the oceans. Directmeasuring of CO2 exchanges between the terrestrial ecosystems and theatmosphere should consider the aquatic systems flows, not overestimatingthe carbon terrestrial accumulation. The Amazon basin has the largest andmore complex system of fresh water in the world, so that it holds animportant in the global carbon cycle. The objective of this work was toevaluate, during the period between September 2004 to August 2005, thedynamics of the Total Dissolved Inorganic Carbon (DIC) and fractions(dissolved CO2 + HCO3 - + CO32 -), in the waters of Teles Pires andCristalino rivers, components of the Amazon basin, in the district of AltaFloresta, MT. Fortnightly were determined DIC concentration, pH andtemperature of the rivers. Based in those results and applying thethermodynamic balance equations, it was possible to estimate the pCO2and the carbonate system fractions. The rivers presented a seasonal variationin the pH values, being closer to the neutrality in the drought period. Theconcentration of HCO3- was significantly larger in the drought than duringthe flood season. Both studied rivers were oversaturated in CO2 related tothe atmosphere.



DOI: https://doi.org/10.5902/2179460X9880

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