Variability of carbon dioxide flux from tropical (Cerrado) hydroelectric reservoirs

摘要: Hydroelectric reservoirs generate energy without significant combustion of fossil fuels. However, these systems can, potentially, emit greenhouse gases (GHG’s) at a rate which may be the global scale, and, possible, co-equal, per kilowatt-hour, to that from conventional coal or oil-fired systems. Although much new construction hydroelectric is in tropics, most data on GHG emissions comes temperate regions. Further, existing reservoir gas single sites, usually near terminal dams. Large tropical often involve impoundments river with complex morphology turn can cause spatial heterogeneity flux. We evaluated and seasonal variability CO2 concentrations flux for five large (50–1,400 km2) Cerrado region Brazil. Most set (87% all measurements) showed supersaturation net efflux atmosphere. There was as more variation pCO2 over space among seasons. The studied different zones terms emission because those fluxes are dependent flooded biomass, watershed input organic matter dam operation regime. Here we demonstrate Brazilian have low rates compared comparisons. Our results suggest ignoring lead than 25% error total system