A perturbative treatment of aerosol scattering of infrared radiation

Computer Science

Scientific paper

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Aerosols, Atmospheric Effects, Atmospheric Heating, Electromagnetic Scattering, Infrared Radiation, Cooling, Integral Equations, Perturbation Theory, Troposphere

Scientific paper

Calculations of long-wave atmospheric heating and cooling rates using the rate equations of Rodgers and Walshaw (1966) with the Malkmus (1967) random band model are presented. A perturbation scheme is developed for the inclusion of aerosol scattering effects in the numerical calculation. Unlike the flux differencing method for calculating long-wave heating and cooling rates, this scheme allows aerosol effects to be included in a simple manner with only a small additional use of computer time. The calculations indicate good agreement with those of previous investigators and demonstrate the expected equivalence of the flux-differencing method and the flux-divergence equation of Rodgers and Walshaw (1966), even at stratospheric altitudes. It is found that aerosols lead to a net heating in the lower troposphere due to infrared scattering and absorption.

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