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Proceedings Paper

Theoretical investigation of the extinction and absorption coefficients of a system of oriented ice plates in optical plane range
Author(s): Olga Vladimirov Shefer; Alexander A. Popov
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Paper Abstract

The report presents a theoretical and numerical investigation of extinction and absorption coefficients as well as the single scattering albedo for polydispersed ensemble of plate-shaped crystals. We analyze a value of the efficiency factor for optical radiation in large crystals. It is shown that in the IR range only for crystals with the plane faces, inclined to each other at an angle more than 10 to 12 degrees, the efficiency factor can be assumed to be equal to 2. Analytical expressions for the coefficients of optical radiation extinction and absorption for ice plates are derived in the approximation of physical optics. The formula for extinction explains both the neutral spectral behavior of the extinction coefficient in the visible range and its wavelength dependence in IR range. Computed wavelength dependence of extinction coefficient has a fine structure and carries certain indicators of the ice plate size. The presented formula for calculating of the absorption coefficient estimates optical radiation intensity being absorbed by atmospheric crystals of any shapes. It is shown that spectral absorption dependence in the IR range has the same features as the dependence of absorption index for ice and ranges up to values comparable to those typical of scattering coefficients. Single scattering albedo is shown to be equal to unity in the visible range, while in the IR range it varies from 0.5 to 0.8.

Paper Details

Date Published: 29 June 1994
PDF: 10 pages
Proc. SPIE 2222, Atmospheric Propagation and Remote Sensing III, (29 June 1994);
Show Author Affiliations
Olga Vladimirov Shefer, Tomsk State Univ. (Russia)
Alexander A. Popov, Mari Polytechnical Institute (Russia)

Published in SPIE Proceedings Vol. 2222:
Atmospheric Propagation and Remote Sensing III
Walter A. Flood; Walter B. Miller, Editor(s)

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