An approximation for spectral extinction of atmospheric aerosols

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 for the Mie scattering efficiency factor, and...

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Bibliographic Details
Published in:Journal of quantitative spectroscopy & radiative transfer 1996-04, Vol.55 (4), p.519-531
Main Authors: Lui, C.W., Clarkson, M., Nicholls, R.W.
Format: Article
Language:English
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Summary: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 for the Mie scattering efficiency factor, and the Deirmendjian modified γ-function form 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.
ISSN:0022-4073
1879-1352
DOI:10.1016/0022-4073(95)00175-1