Computer Science
Scientific paper
Apr 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jqsrt..55..519l&link_type=abstract
Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 55, issue 4, pp. 519-531
Computer Science
1
Aerosols: Radiative Transfer, Aerosols: Extinction, Aerosols: Earth Atmosphere
Scientific paper
A closed-form approximation is derived for the frequency/wavelength dependence of the spectral extinction function for optical depths of columns of various categories of atmospheric aerosols. It adopts the Van de Hulst anomalous diffraction approximation (1957) for the Mie scattering efficiency factor, and the Deirmendjian modified γ-function form (1969) for the particle size distribution. Comparisons are made between the optical depths predicted by the approximation and from their numerical evaluation using the complete Mie function. Agreement is excellent over frequency segments of the ultraviolet, optical and infrared spectral regions for many modified γ-distributions. A method for extending the valid frequency range of the approximation is presented.
Clarkson M.
Lui C. W.
Nicholls Ralph W.
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