Abstract

Careful consideration must be given to the simultaneous treatment of the radiative transfer of the CO 2 15 μm band and dust. Calculations for the Martian winter polar region show that a simple sum of separately calculated CO 2 cooling rates and dust cooling rates can easily result in a 30% error in the net cooling, particularly near the surface. CO 2 and dust hinder each other's ability to cool the atmosphere. Even during periods of low dust opacity, dust still reduces the efficacy of CO 2 at cooling the atmosphere. At the other extreme when dust storms occur, CO 2 still significantly impedes the ability of dust to cool the atmosphere. Hence, both CO 2 and dust must be considered in radiative transfer models.

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