Thijs van Leeuwen (2013) published a paper that investigated biomass burning bottom up inventories. He used TM5 to transport CO emissions. The figure shows the mean CO mixing ratio enhancement due to biomass burning (ppb) for the (upper panel) GFED A&M scenario, and the difference between (lower panel) MCE-SEASON and GFED-A&M. A monthly mean of the 2002–2007 period was used. CO mixing ratios were based on the seven lowest vertical layers, weighted by mass, corresponding to on average an atmospheric pressure of ~800 hPa on the top of layer 7.