First ground-based FTIR observations of methane in the inner tropics over several years
Total column concentrations of methane have been retrieved from\nground-based solar absorption FTIR spectra in the near-infrared recorded\nin Paramaribo (Suriname). The methane FTIR observations are compared\nwith TM5 model simulations and satellite observations from SCIAMACHY,\nand represent the first validation of SCIAMACHY retrievals in the inner\ntropics using ground-based remote sensing techniques. Apart from local\nbiomass burning features, our methane FTIR observations agree well with\nTM5 model simulations. The comparison of the direct measured CH(4)/CO(2)\nratios by FTIR and satellite reveals that the satellite can hardly\ndetect methane emissions of tropical biomass burning due to the used\nretrieval method.