Impacto das queimadas na variabilidade do metano atmosférico sobre a América do Sul: 10 anos de observações espaciais do sensor AIRS

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The spatiotemporal variability of the greenhouse gas methane (CH4) in the atmosphere over the South America is studied using data from the space-borne measurements of the Atmospheric Infrared Sounder on board NASA’s AQUA satellite for the period 2003–12. The results show a pronounced variability of this gas over the Central region of the South America, where biomass burning occur with more frequently. CH4 and CO show positive correlation. Concerning this variability, the present study indicates the important role of ENSO in modulating the variability of CH4 emissions over the southeastern Amazon, where this association seems to be mostly linked to changes in precipitation in response to ENSO, which provide long periods of drought, increasing the probability of occurrence of fires, which explains the increase in CH4 emissions in this region. This result might be useful for future monitoring of the variations in the concentration of CH4, the second-most important greenhouse gas, in this area.