The optical characteristics of atmospheric ice particles are usually calculated within the framework of the physical optics approximation, since particle sizes generally vary from 10 to 1000 microns. However, the results of experimental measurements show that ice crystals up to 10 microns in size are observed in cirrus clouds of the upper tier. The report presents a solution to the problem of light scattering for particles, obtained in the framework of the methods of the physical optics and discrete dipoles. Based on the solution, such important optical characteristics as depolarization and spectral ratios were calculated. Two limiting cases are considered: ideal hexagonal particles and randomly shaped particles.
The report analyzes the data of microscopic observation of atmospheric ice crystal particles in the surface layer of the atmosphere. Observations were conducted in Tomsk during the winter of 2017-2018. The results of observations are used to create an adequate microphysical model of atmospheric ice crystals for solving the light scattering problem by the method of the physical optics.
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