Radar-lidar ratio for ice crystals of cirrus clouds

Wang, Zhenzhu; Shishko, Victor A.; Kustova, Natalia V.; Konoshonkin, Alexander V.; Timofeev, Dmitriy N.; Xie, Chenbo; Liu, Dong; Borovoi, Anatoli G.

doi:10.1364/oe.410942

Cited by 16 publications

(9 citation statements)

References 41 publications

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“…This method is the most applicable for this problem because of capability of calculation of particle parameter size x > 10 and precise results in the backscattering direction [31]. Also, it was used for solving problems related with remote sensing of atmospheric ice crystals [32,33]. In this method particle consist of facets with multiple vertices.…”

Section: Methodsmentioning

confidence: 99%

Light Scattering Properties for Aggregates of Atmospheric Ice Crystals Within the Physical Optics Approximation

Timofeev¹,

Kustova²,

Shishko³

et al. 2023

Preprint

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This paper presents the light scattering matrices of atmospheric aggregated hexagonal ice particles appearing in cirrus clouds. In this work aggregates consist of the same particles with different spatial orientation and number of these particles. Two types of particle shape were studied: (1) hexagonal column; (2) hexagonal plate. For both shapes we study compact and non-compact cases of arrangement of particles in aggregates. As a result, four sets of aggregates were made: (1) compact columns; (2) non-compact columns; (3) compact plates; (4) non-compact plates. Each set consists of eight aggregates with different number of particles from 2 to 9. For practical reason the bullet-rosette and the aggregate of hexagonal columns with different sizes was also calculated. The light scattering matrices were calculated for the case of arbitrary spatial orientation within the geometrical optics approximation for sets of compact and non-compact aggregates and within the physical optics approximation for two additional aggregates. It was found that light scattering matrix elements for aggregates are depend on arrangement of particles they are consisted.

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Section: Methodsmentioning

confidence: 99%

Light Scattering Properties for Aggregates of Atmospheric Ice Crystals Within the Physical Optics Approximation

Timofeev¹,

Kustova²,

Shishko³

et al. 2023

Preprint

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“…Nevertheless, in order to interpret the signal from an instrument of active remote sensing of the atmosphere, it is necessary to solve the direct problem of light scattering for the entire variety of shapes and sizes of atmospheric particles 35 .…”

Section: Introductionmentioning

confidence: 99%

Light scattering by ice hexagonal tubes calculated within the geometrical optics approximation

Shishko,

Russkova,

Timofeev

et al. 2023

29th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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Among the ice crystals of cirrus clouds, there are crystals of irregular shape. The imperfection of ice crystals can be both internal (e.g. inclusions such as air bubbles or soot particles) and external (e.g. surface roughness). Advanced studies showed that these imperfections have to be taken into account, because they affect significantly on the single-scattering properties of the ice crystal. The paper presents a solution to the problem of light scattering on ice crystal hexagonal tubes. This particle shape is the simplest model of a particle with internal inclusions. The model was based on the most common shape of a crystal observed in cirrus clouds -a hexagonal column with a ratio of base diameter to height of 0.69, in which a through hole was made, with a variable geometry. The solution was obtained within the geometrical optics approximation for the refractive index of ice 1.3116. The optical characteristics of hexagonal tubes are compared with non-convex particles (hollow columns) available in the database.

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“…These clouds are predominantly composed of ice particles 16,17 . The main tool for studying the optical properties of cirrus clouds is currently lidars [18][19][20][21] and radars [22][23][24][25] .…”

Section: Introductionmentioning

confidence: 99%

Calculation of light backscattering matrix by the DDA method for arbitrary particles of cirrus clouds for lidar remote sensing

Konoshonkin

Shishko²,

Kustova³

et al. 2022

Remote Sensing of Clouds and the Atmosphere XXVII

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The paper presents a solution to the problem of light scattering by small randomly oriented ice crystals of arbitrary shape. The solution was obtained within the discrete dipole approximation. The particle sizes ranged from 0.02 up to 4 μm. The wavelength of the incident radiation is 0.532 μm, the refractive index is 1.3116. The influence of the number of dipoles per lambda and number of orientations on the convergence of the solution is shown. It is shown that the computation time has an exponential law dependence on particle size.

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Radar-lidar ratio for ice crystals of cirrus clouds

Cited by 16 publications

References 41 publications

Light Scattering Properties for Aggregates of Atmospheric Ice Crystals Within the Physical Optics Approximation

Light Scattering Properties for Aggregates of Atmospheric Ice Crystals Within the Physical Optics Approximation

Light scattering by ice hexagonal tubes calculated within the geometrical optics approximation

Calculation of light backscattering matrix by the DDA method for arbitrary particles of cirrus clouds for lidar remote sensing

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