Light scattering by mixed-phase clouds

Alexander G. Petrushin

doi:10.1117/12.458463

28 February 2002 Light scattering by mixed-phase clouds

Alexander G. Petrushin

Proceedings Volume 4678, Eighth International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; (2002) https://doi.org/10.1117/12.458463
Event: Eighth Joint International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 2001, Irkutsk, Russian Federation

Abstract

The main optical characteristics of light scattering by mixed-phase clouds (the phase scattering function, the scattering, absorption and extinction efficiencies) were investigated. A theoretical study using a particle size spectrum of a mixed-phase cloud microstructure under the assumption of its spatial homogeneity is presented. The calculations of optical characteristics for the droplets of the mixed-phase cloud were made with the Mie theory and for the crystalline fraction the calculation methods connected with the geometrical optics and diffraction were used. For the mixed-phase cloud particle size spectrum the expressions were used that connect the ratio of droplets liquid water content to the crystals ice content (t) with the ratio of scattering coefficients for these fractions (q) for mixed- phase clouds. This made it possible to use the known expressions for calculations of the t values depending on the cloud layer temperature T to calculate the dependence of q on T.. The parameter q determines unambiguously basic optical characteristics for a mixed-phase cloud medium. It depends on the parameters of a particle size spectrum for water droplet and ice crystal fractions of a mixed-phase cloud and significantly depends on the incident radiation wavelength.

Citation Download Citation

Alexander G. Petrushin "Light scattering by mixed-phase clouds", Proc. SPIE 4678, Eighth International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, (28 February 2002); https://doi.org/10.1117/12.458463

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