Fig. 6

Comparison of CH4/CO ratios from the GEOS-Chem model and Aura TES data. a Comparison of CH4/CO ratios observed in tropical and sub-tropical fire plumes from the Aura TES data to those expected from the GEOS-Chem model with GFED-based emission factors. b The regions corresponding to symbols in a. The best fit (weighted to the size of the fire emissions) and the corresponding standard error (standard error or the pink-shaded area in figure) are shown by the red line and shaded area. Fires from different regions are shown as different symbols. The relative size of the fire emissions is indicated by the relative size of the symbols