Absorption accounting in the light scattering problem for arbitrarily shaped atmospheric ice particles within physical optics approximation method

2019 ◽  
Author(s):  
Dmitriy N. Timofeev ◽  
Alexander Konoshonkin ◽  
Natalia Kustova ◽  
Anatoli Borovoi
Keyword(s):  
Light Scattering ◽  
Approximation Method ◽  
Scattering Problem ◽  
Physical Optics ◽  
Ice Particles ◽  
Physical Optics Approximation

scholarly journals Using the Physical Optics Approximation for Estimating the Light Scattering Properties of Large Dust Particles for Lidar Applications

2020 ◽  
Vol 237 ◽  
pp. 08025
Author(s):  
Alexander Konoshonkin ◽  
Natalia Kustova ◽  
Anatoli Borovoi ◽  
Alexandra Tsekeri ◽  
Josef Gasteiger
Keyword(s):  
Light Scattering ◽  
Extinction Coefficient ◽  
Scattering Problem ◽  
Power Laws ◽  
Scattering Matrix ◽  
Dust Particles ◽  
Physical Optics ◽  
Depolarization Ratio ◽  
Physical Optics Approximation ◽  
Dda Method

The physical optics approximation was used to solve the light scattering problem of large dust particles with irregular shape. The comparison between the physical optics approximation and the DDA method was made for particles with volume-equivalent size parameters of 44.21. A full light scattering matrix (Mueller matrix) was calculated for particles with volume-equivalent size parameters from 44 up to 220 for two wavelengths: 0.532 and 1.064 μm. The dependences of the lidar and depolarization ratio, and extinction coefficient on the number of spatial orientations of the particle were obtained. It was shown that the elements of the light backscattering matrix obey power laws.

scholarly journals Light Backscattering by Ice Crystals of Cirrus Clouds Within the Physical Optics Approximation

2020 ◽  
Vol 237 ◽  
pp. 08011
Author(s):  
Alexander Konoshonkin ◽  
Anatoli Borovoi ◽  
Natalia Kustova ◽  
Zhenzhu Wang ◽  
Dong Liu ◽  
...  
Keyword(s):  
Light Scattering ◽  
Spatial Orientation ◽  
Scattering Problem ◽  
Cirrus Clouds ◽  
Ice Crystals ◽  
Physical Optics ◽  
Nonspherical Particles ◽  
Physical Optics Approximation ◽  
Computer Resources

Lidar technologies are widely used for retrieving microphysics of cirrus clouds, i.e. sizes, shapes and spatial orientation of ice crystals constituting the clouds. Interpretation of the lidar signals are based on the backscattered light. However, properties of the light backscattered by the ice crystals have not been well known and understood yet. The reason of this is that the problem of light scattering by the ice crystals much larger that incident wavelengths has not been solved satisfactorily yet because of great demands to computer resources. In this contribution we review the physical optics approximation as a prospective method to solve the light scattering problem on large nonspherical particles in lidar application.

Light scattering by ice crystals of cirrus clouds: From exact numerical methods to physical-optics approximation

2017 ◽  
Vol 195 ◽  
pp. 132-140 ◽  
Author(s):  
Alexander Konoshonkin ◽  
Anatoli Borovoi ◽  
Natalia Kustova ◽  
Hajime Okamoto ◽  
Hiroshi Ishimoto ◽  
...  
Keyword(s):  
Light Scattering ◽  
Numerical Methods ◽  
Cirrus Clouds ◽  
Ice Crystals ◽  
Physical Optics ◽  
Physical Optics Approximation

scholarly journals Light Scattering by Particles with Arbitrary Shape in the Vicinity of the Backward Scattering Direction within Geometrical Optics Approximation

2020 ◽  
Vol 237 ◽  
pp. 08012
Author(s):  
Victor Shishko ◽  
Alexander Konoshonkin ◽  
Natalia Kustova ◽  
Anatoli Borovoi ◽  
Dmitry Timofeev
Keyword(s):  
Experimental Data ◽  
Refractive Index ◽  
Light Scattering ◽  
Arbitrary Shape ◽  
Specular Reflection ◽  
Scattering Problem ◽  
Geometrical Optics ◽  
Optical Characteristics ◽  
Ice Particles ◽  
Scattering Light

The work presents the solution for the light scattering problem by arbitrarily-shaped particles in the vicinity of the backward scattering direction. The solution was obtained within the framework of the geometrical optics approximation. The refractive index was equal to 1.3116. It was shown that the general contribution of scattering light for arbitrarily-shaped particles in the vicinity of the backscattering direction consists of the specular reflection of the particles and two types of non-specular optical beams. It is shown that the optical characteristics of the ice particles with arbitrary shapes correspond to experimental data.

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