Problem of light scattering by atmospheric ice crystals

Konoshonkin, Alexander V.; Kustova, Natalia V.; Borovoi, Anatoli G.; Timofeev, Dmitriy N.; Shishko, Victor A.

doi:10.1117/12.2288258

Cited by 4 publications

(6 citation statements)

References 32 publications

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“…The authors of this paper have developed the algorithm that is applicable to backscattering by large particles. This algorithm is described in detail in a recent book [14]. Some calculations obtained with this algorithm have been already verified by comparisons with the lidar measurements [15,16].…”

Section: Introductionmentioning

confidence: 95%

Coherent Backscattering by Large Ice Crystals of Irregular Shapes in Cirrus Clouds

et al. 2022

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All elements of the scattering matrix have been numerically studied for particles of irregular shapes whose size is much larger than incident wavelength. The calculations are performed in the physical optics approximation for a particle size of 20 μm at a wavelength of 0.532 μm. Here the scattered intensity reveals the backscattering coherent peak. It is shown that the polarization elements of the matrix reveal the surges within the backscattering peak. The angular width of the surges does not practically depend on particle shape, but depends on the particle size. It is shown that these surges are created by interference between the conjugate scattered waves propagating in the inverse directions. The results obtained are of interest for interpretation of lidar measurements in cirrus clouds.

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Section: Introductionmentioning

confidence: 95%

Coherent Backscattering by Large Ice Crystals of Irregular Shapes in Cirrus Clouds

et al. 2022

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“…As known, the solution of the light scattering problem by a randomly oriented particle having a plane of symmetry is completely determined by the following Mueller matrix (light scattering matrix) M 26 : The light scattering matrices for randomly oriented small ice crystals were calculated within the DDA method developed by M. Yurkin 27 for particle sizes ranged from 0.2 to 4 µm and the physical optics approximation 25 for particle sizes ranged from 4.0 to 6.0 µm. A hexagonal column was chosen as the basic shape of the ice crystal.…”

Section: Methodsmentioning

confidence: 99%

“…On the other hand, to solve the problem of light scattering in the radiation transfer problem on large particles, geometrical optics is used 24 . However, this method is not applicable to laser sounding problems, since it does not take into account wave phenomena in the backward scattering direction, which is important for such problems 25 . To fill this gap, the method of physical optics approximation was developed 25 .This method is applicable to large particles (size parameter x>100).…”

Section: Introductionmentioning

confidence: 99%

“…However, this method is not applicable to laser sounding problems, since it does not take into account wave phenomena in the backward scattering direction, which is important for such problems 25 . To fill this gap, the method of physical optics approximation was developed 25 .This method is applicable to large particles (size parameter x>100). When physical optics approximation is used for particles with size parameter x<60, the method will lead to a significant error.…”

Section: Introductionmentioning

confidence: 99%

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Solution of the light scattering problem by small atmospheric ice crystals by discrete dipole approximation and comparison with the physical optics approximation

Shishko

Kan

Timofeev

et al. 2022

28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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The paper presents a solution to the problem of light scattering by small randomly oriented hexagonal ice crystals of cirrus clouds. The solution was obtained both within the discrete dipole approximation and within the physical optics approximation. The particle sizes ranged from 0.2 to 6 μm. The wavelength of the incident radiation is 0.532 μm, the refractive index is 1.3116. The results of the comparison of the solutions obtained within the framework of the discrete dipole approximation with the physical optics approximation are shown. It is found that the solutions are in good agreement, however, to solve the problem of light scattering in the vicinity of the backward direction, which is important for the interpretation of lidar data, it is necessary to continue the calculations by the discrete dipole approximation up to particle sizes of about 10 μm.

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“…*tdn@iao.ru; phone +7 999 619-7994; fax +7 3822 492-086; iao.ru For larger particles of this kind, the physical optics approximation 42,43 is used, which was applied in this work. This method was used to solve a number of problems of light scattering for cirrus clouds [44][45][46] . The current version of this method supports complex refractive index to take absorption of the particles into account [47][48] .…”

Section: Introductionmentioning

confidence: 99%

Light backscattering matrix for atmospheric crystals of an irregular shape with different refractive indices within the physical optics approximation

Timofeev

Tkachev

Konoshonkin

et al. 2022

28th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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The paper presents the light backscattering matrices for crystal particle of an irregular convex shape of the size of 200 micrometers with different refractive indices within the physical optics approximation. The calculation of matrices was carried out at the wavelengths of incident light of 0.532 micrometers, for the case of an arbitrary spatial orientation of particles. The matrices can be used to study mineral dust cloud particles.

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Problem of light scattering by atmospheric ice crystals

Cited by 4 publications

References 32 publications

Coherent Backscattering by Large Ice Crystals of Irregular Shapes in Cirrus Clouds

Coherent Backscattering by Large Ice Crystals of Irregular Shapes in Cirrus Clouds

Solution of the light scattering problem by small atmospheric ice crystals by discrete dipole approximation and comparison with the physical optics approximation

Light backscattering matrix for atmospheric crystals of an irregular shape with different refractive indices within the physical optics approximation

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