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Biogeosciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/bg-2017-407
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2017-407
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 26 Oct 2017

Submitted as: research article | 26 Oct 2017

Review status
This discussion paper is a preprint. A revision of the manuscript for further review has not been submitted.

CO2 Flux and its Relationship with Water Parameters and Biological Activity in the Ji-Paraná River (Rondônia State – Western Amazon)

Thandy Junio da Silva Pinto1 and Beatriz Machado Gomes2 Thandy Junio da Silva Pinto and Beatriz Machado Gomes
  • 1Post-Graduate Program in Environmental Engineering Sciences, Center of Water Resources and Environmental Studies, Nucleus of Ecotoxicology and Applied Ecology, University of São Paulo, Rodovia Domingos Innocentini, km 13, 13560- 970, Itirapina (SP), Brazil. Post Office Box 292, São Carlos, SP CEP 13560-970, Brasil
  • 2Laboratory of Hydrogeochemistry, Environmental Engeneering Departament, Federal University of Rondônia Rua Rio Amazonas 351, Jardim dos Migrantes, CEP 76900-726, Brasil

Abstract. Over the past decades, the role of tropical rivers in the carbon cycle paradigm has been revised due to their importance in the regional carbon budget and identified as important emitters of carbon to atmosphere. This study, conducted in the Ji-Paraná River, quantifies the CO2 flux in the water-air interface according to the floating chamber methodology and verifies the seasonal variation and its relationship with physical, chemical and biological water parameters. The physical-chemical parameters analyzed were temperature, pH, electrical conductivity, dissolved oxygen, transparency, alkalinity, and turbidity, and the biological parameter was chlorophyll concentration. The Ji-Paraná River behaves as a source of carbon to the atmosphere, with higher emission peaks in high waters (4869.20 ± 779.95 mgC m−2 day−1) and lower values in low water (711.20 ± 131.51 mgC m−2 day−1) – the difference between the periods reached 6.8 times. Dissolved oxygen, pH, electrical conductivity and water transparency were correlated with flux and explained the gaseous exchange dynamics. CO2 flux was strongly related to the river flow, which evidences the importance of river regime variations in gaseous emissions. Chlorophyll was strongly related to flux, therefore, the primary production is an important sink of CO2 to the Ji-Paraná River, which indicates biological activity significantly influences the river carbon cycling.

Thandy Junio da Silva Pinto and Beatriz Machado Gomes
Interactive discussion
Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
  • RC1: 'Review', Anonymous Referee #1, 16 Nov 2017 Printer-friendly Version
  • RC2: 'Review 2', Anonymous Referee #2, 14 Dec 2017 Printer-friendly Version
Interactive discussion
Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
  • RC1: 'Review', Anonymous Referee #1, 16 Nov 2017 Printer-friendly Version
  • RC2: 'Review 2', Anonymous Referee #2, 14 Dec 2017 Printer-friendly Version
Thandy Junio da Silva Pinto and Beatriz Machado Gomes
Thandy Junio da Silva Pinto and Beatriz Machado Gomes
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Short summary
This study investigates the regulating mechanism for the CO2 exchange between air and water, and evidences that the biologic activity is an important regulating mechanism for the CO2 emission rate and the seasonal variation controls it. Most studies have considered the physical-chemical water parameters and atmospheric variation as a regulating mechanism in the gas exchange, however, we have concluded the biologic activity can be a driver for the regulation of carbon evasion in tropical rivers.
This study investigates the regulating mechanism for the CO2 exchange between air and water, and...
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