A note on the enhancement of J values in optically thick scattering atmospheres

Details A note on the enhancement of J values in optically thick scattering atmospheres A note on the enhancement of J values in optically thick scattering atmospheres

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991cajph..69.1166k&link_type=abstract

Canadian Journal of Physics (ISSN 0008-4204), vol. 69, Aug.-Sept. 1991, p. 1166-1174. Research supported by NSERC and Atmospheri

Physics

2

Atmospheric Scattering, Optical Thickness, Planetary Atmospheres, Photoabsorption, Rayleigh Scattering, Uranus Atmosphere

Scientific paper

In a planetary atmosphere the J value is determined by the angular-averaged radiance, or the average density of photons in an element of volume. The average density may be enhanced by multiple scattering of photons in a conservative, or near-conservative scattering atmosphere. It is shown that in a conservative semiinfinite medium this enhancement will be a factor of five, for optical depths greater than about 20 for coherent scattering. The modification of the J values owing to multiple scattering in an optically thick medium of various optical depths, various single-scattering albedos of the scattering medium, and a range of surface albedos is investigated. The results are applied to the calculation of J values in clouds in the terrestrial atmosphere and in the Rayleigh-scattering atmosphere of Uranus. It is noted that J values in a realistic atmosphere may be enhanced by as much as a factor of five throughout a large fraction of the atmosphere over those calculated without multiple scattering and surface reflection.

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