Parmeterization of IR cooling at a middle atmosphere dynamics model 1. Effects on the zonally averaged circulation

Statistics – Computation

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Scientific paper

A computationally effcient two-stream parameterization of IR cooling is developed for a middle atmosphere dynamics model. The parameterization combines the monochromatic feature of an emissivity formulation with the computational simplicity of a single spatial integral to evaluate the monochromatic transfer equation. Our calculations show strong radiative control of the mesopause region (radiative relaxation rate >[5 days]-1) and the need for substantial deceleration of the mean zonal winds (~40 m s-1 day-1). Calculated temperatures show good agreement in the summer hemisphere where planetary wave activity is negligible, but in the polar night of the winter hemisphere they are ~30°K too cold which suggests planetary wave heating must make up the deficit. With observed ozone densities our globally averaged radiative equilibrium temperature in the 65-75 km region are too cold and an additional heat source ~1°K day -1 is required.

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