SPACE-TEMPORAL EVALUATION OF CH4 EMISSIONS IN THE GUARAPIRANGA – SP RESERVOIR.
The Intergovernmental Panel on Climate Change (IPCC) published in October 2018 a special Report point to an average global warming of 1.5 ° C. Major greenhouse gases (carbon dioxide and methane) account for 92% (76 % CO2 and 16% CH4) of total greenhouse gas emissions. Although CH4 is not the most abundant greenhouse gas (GHG) in the earth's atmosphere, it’s global warming potential is much higher than CO2. Methane warming potential over a 100-year horizon is estimated to be 28 times greater than carbon dioxide, thus increasing its contribution to global warming. Wetlands fulfill important ecological functions, including in the carbon cycle, and are considered as the largest natural sources of methane on the planet. The Guarapiranga reservoir is located in the territory of the Alto Tietê Watershed, located in the southeastern part of the São Paulo Metropolitan Region (MRSP). This urban reservoir has flooded areas with regions close to large population concentrations and often subjected to a large load of pollutants, which may influence greenhouse gas emissions into the atmosphere. The periods of higher precipitation incidence and drought periods have changed the dynamics and composition of the reservoirs, so it is extremely important to investigate if there is influence of seasonality and what are the factors that govern GHG emissions over the hydrological periods.