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Parameterization of Infrared Radiative Transfer in Cloudy Atmospheres

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  • 1 Department of Meteorology, University of Utah, Salt Lake City 84112
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Abstract

Parameterization of the transfer of infrared fluxes is developed for an atmosphere containing nonblack and semi-transparent clouds. The concept of parameterization makes use of the predetermined broadband cloud emissivity, transmissivity and reflectivity as functions of the cloud liquid water/ice content. In conjunction with the cloud radiative properties, broadband emissivities for water vapor, carbon dioxide and ozone are derived from band parameters in which the effects of pressure and temperature on absorption are accounted for in the path length based on a number of physical adjustments. Infrared cooling rates computed from the parameterized broadband model for clear and cirrus cloudy atmospheres show close agreement with those obtained from a more sophisticated band-by-band model with accuracy within about 0.2°C day−1.

Abstract

Parameterization of the transfer of infrared fluxes is developed for an atmosphere containing nonblack and semi-transparent clouds. The concept of parameterization makes use of the predetermined broadband cloud emissivity, transmissivity and reflectivity as functions of the cloud liquid water/ice content. In conjunction with the cloud radiative properties, broadband emissivities for water vapor, carbon dioxide and ozone are derived from band parameters in which the effects of pressure and temperature on absorption are accounted for in the path length based on a number of physical adjustments. Infrared cooling rates computed from the parameterized broadband model for clear and cirrus cloudy atmospheres show close agreement with those obtained from a more sophisticated band-by-band model with accuracy within about 0.2°C day−1.

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