pure and applied geophysics

, Volume 119, Issue 2, pp 248–258 | Cite as

An approximate computation of infrared radiative fluxes in a cloudy atmosphere

  • J. Schmetz
  • E. Raschke


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 μm 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 μm) 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.

Key words

Cloudy atmosphere Cooling/heating rates Radiative transfer 


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Copyright information

© Birkhäuser Verlag 1981

Authors and Affiliations

  • J. Schmetz
  • E. Raschke
    • 1
  1. 1.Institut für Geophysik und Meteorologie der Universität zu KölnKöln 41Germany

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