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Title: CO2 concentration and flux in hydroelectric reservoir of Balbina (AM)
Other Titles: Concentração e fluxo de CO2 sobre o reservatório hidrelétrico de Balbina (AM)
Authors: Vale, Roseilson Souza do
Santana, Raoni Aquino Silva de
Tóta, Júlio
Miller, Scott Dennis
Souza, Rodrigo
Branches, Rardiles
Lima, Newton
Issue Date: 2017
metadata.dc.publisher.journal: Engenharia Sanitaria e Ambiental
metadata.dc.relation.ispartof: Volume 22, Número 1, Pags. 187-193
Abstract: The reservoir Balbina (59º 28’ 50w, 1º 53’ 25” S), located near the city of Manaus, Amazonas, in Central Amazônia, Brazil, is the second largest hydroelectric reservoir in an area located in the Amazon Basin. In this reservoir, CO2 measurements were performed at high frequency (10 Hz), CO2 flux with gas analyzer infrared (IRGA) coupled to a floating chamber and meteorological variables with a buoy instrumented to 2 m from the lake surface. The average CO2 concentration was 392 and 426 ppm for the day and night, respectively, and the daily average emission rate was 40.427±24.040 μmol-1.m-2.d-1. The accumulation of CO2 in the lake overnight, beyond respiration, shows to be affected by low wind speeds, waterside convection, physical processes involving high concentrations of CO2 for the surface and the presence of land breeze. The fluxes show no statistically significant difference with the meteorological variables and were considerably lower than a previous study for the same lake. However, the values are in agreement with other studies in Amazonian tropical lakes and other reservoirs. © 2017, ABES - Associacao Brasileira de Engenharia Sanitaria e Ambiental. All rights reserved.
metadata.dc.identifier.doi: 10.1590/S1413-41522017143032
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