Fig. 2
Schematic illustration of equivalent extinction (EE). An equivalent grey absorption is calculated for each minor gas (CO in our case), as shown in panel a), using Eq. (13) or 14. This grey absorption is added onto the k-coefficients of the major gas (H2O in this example) using the corresponding mixing ratios, here assumed to be ζH2O = 0.9, ζCO = 0.1, as shown in panel b).
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