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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

EVALUATION OF UPWELLING INFRARED RADIANCE IN A NONEQUILIBRIUM NONHOMOGENEOUS ATMOSPHERE

Get access (open in a dialog) DOI: 10.1615/IHTC7.4140
pages 559-564

Abstract

The influence of vibrational nonequilibrium upon upwelling infrared radiance from the earth's atmosphere is investigated. By employing the line-by-line model for spectral absorption, heating rates and upwelling radiances are calculated for equilibrium and nonequi1ibrium conditions in the spectral range of 4.7µ CO and 3.3 µ CH4 bands. Heating rates are calculated also for the 15µ CO2 band and are compared with other available results in the literature. For the spectral range of the CO fundamental band, the influence of different parameters on the upwelling radiance are investigated. It is found that for CO the assumption of local thermodynamic equilibrium (LTE) is not justified at tropospheric temperatures and pressures. If the resonance effects of C0-N2 collisions are considered, then the assumption of LTE is justified up to 60 kilometers. This information is very useful for measurement of atmospheric pollutants, Earth's radiation budget studies and climate modeling, and infrared signature works.