An approximate computation of infrared radiative fluxes in a cloudy atmosphere |
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| Authors: | J Schmetz E Raschke |
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| Institution: | (1) Institut für Geophysik und Meteorologie der Universität zu Köln, Kerpener Str. 13, D-5000 Köln 41, Germany |
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| Abstract: | A two-stream approximation is applied to the equation of infrared (IR) radiative transfer in order to compute the detailed structure of fluxes and cooling/heating rates in inhomogeneous, cloudy atmospheres. The spectrum between 4 and 400  m is split into 50 bands, and absorption of water vapour, uniformly mixed gases, ozone, water vapour polymers and water droplets are taken into account. Allowance is made for scattering by water droplets in the atmospheric window region (8–12.8 m) where the delta function approximation is used. The backward scattering coefficient is calculated from the asymmetry parameter by means of a new simple formula. The model is compared to other radiative transfer schemes and some applications are presented. |
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| Keywords: | Cloudy atmosphere Cooling/heating rates Radiative transfer |
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