Vol. 30, issue 07, article # 1

Konoshonkin A.V. Optical characteristics of irregular atmospheric ice columns. // Optika Atmosfery i Okeana. 2017. V. 30. No. 07. P. 543–551 [in Russian].
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Abstract:

The study of cirrus clouds, which significantly affect the climate, is carried out using lidars. Interpretation of the lidar data is based on the direct solution of the problem of light scattering by particles of crystal clouds. Optical characteristics of perfect ice hexagonal columns, obtained previously, poorly agree with the lidar observation results. The work describes calculations of the optical characteristics of irregular hexagonal ice columns, which are in a good agreement with the experimental results. The calculations for particles with deformation of a dihedral angle of 90° are presented. It is shown that the logarithm of the scattering matrix can be well linearly approximated by the logarithm of the particle size. This can significantly speed up the calculations of the optical characteristics of clouds. It is ascertained that the optical characteristics are in a good agreement with the lidar observation results throughout the entire range of sizes calculated even at deformation angles of a few degrees.

Keywords:

irregular ice columns, cirrus clouds, physical optics, light scattering, ice crystals

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