研究目的
To estimate the absorption effect on light scattering by atmospheric ice crystals for wavelengths typical for problems of laser sounding of the atmosphere.
研究成果
The study concludes that the influence of absorption for UV and visible spectrum regions can be neglected when solving the problem of light scattering by ice crystals of cirrus clouds. However, in the near-IR range, the effect of absorption can reach tens of percent, necessitating its consideration in light scattering problems for these wavelengths.
研究不足
The study is limited to the geometrical optics approximation and does not account for exact methods due to their high computational resource requirements. The effect of absorption is estimated for specific wavelengths and crystal shapes, potentially not covering all possible scenarios in atmospheric conditions.
1：Experimental Design and Method Selection:
The study uses the geometrical optics approximation to calculate light scattering matrices for ice crystals of arbitrary shape with allowance for absorption. The MBS-1 beam tracing method is employed within this approximation.
2：Sample Selection and Data Sources:
The study considers convex hexagonal ice columns and arbitrarily shaped crystals as numerical models. The calculation is carried out for the case of random spatial orientation of crystals for four wavelengths.
3：List of Experimental Equipment and Materials:
The study involves numerical models of ice crystals generated in the .STL format and converted into .DAT files for computer program use.
4：Experimental Procedures and Operational Workflow:
The study involves calculating the scattering phase function for hexagonal columns and arbitrary crystals, with and without allowance for absorption, to estimate the effect of absorption on light scattering properties.
5：Data Analysis Methods:
The effect of absorption is expressed in terms of the quantity χ for the exactly backward direction and ψ for the entire scattering phase function.
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