Abstract
Light backscattering matrices are calculated within the physical optics approximation for hexagonal atmospheric ice particles distorted in different ways for the case of arbitrary spatial orientation and single scattering. A hexagonal prism with a height of 31.62 μm and an external diameter of 22.14 μm, which is typical for “column”-type particles observed in cirrus clouds, is chosen as a basic geometric shape. Three shape distortion methods for the particles are used: tilt, convexity and concavity; the angle of distortion varies from 0° to 50° for every particle type. The wavelength of incident radiation is 1.064 μm. The calculation has shown a sharp decrease in the backscattering cross section with an increase in the angle of distortion for all particle types under study.
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Funding
The calculations of light backscattering matrices for particles of the hollow column type were supported by the Russian Science Foundation (grant no. 21-77-10089). Calculations of the light backscattering matrices for particles of the double bullet type were supported by the Ministry of Science and Higher Education of the Russian Federation (V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences). Calculations of light backscattering matrices for particles of the oblique column type were supported by the President of the Russian Federation (grant no. MD-3149.2022.1.5). Averaging over the particle distortion angle was supported by Russian Foundation for Basic Research (grant no. 21-55-53027).
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Timofeev, D.N., Konoshonkin, A.V., Kustova, N.V. et al. Light Backscattering Properties of Distorted Hexagonal Atmospheric Ice Particles within the Physical Optics Approximation. Atmos Ocean Opt 35, 158–163 (2022). https://doi.org/10.1134/S1024856022020130
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DOI: https://doi.org/10.1134/S1024856022020130