Coherent and incoherent backscattering by a single large particle of irregular shape

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

doi:10.1364/oe.27.032984

Cited by 31 publications

(10 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results of a spaceborne lidar sounding a cirrus cloud differ slightly fro m the results obtained for the case of ground-based measurements, what, as in the previous case, can be exp lained by the high elongation in the forward direction of the scattering phase function of large ice crystals. At the same time, the contribution of mu ltip le scattering to the return signal can be higher when using in the calculations the scattering phase function obtained, for instance, by V. Shishko et al 23 in the geometric -optics approximation for 300 irregular ice particle shapes. This scattering phase function does not have a clearly defined peak in the reg ion of s mall scattering angles.…”

Section: Modeling Results: Effects Of Multiple Scatteringmentioning

confidence: 99%

Modeling of laser pulse propagation in clouds taking into account multiple scattering

Russkova

Kan

2022

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

View full text Add to dashboard Cite

The work proposes an original algorithm of the Monte Carlo method for simulating the propagation of laser pulses in a cloudy atmosphere taking into account all scattering orders. The results of studying the features of echo signal propagation through the cloud represented by semi-infinity homogeneous layer are discussed. The contribution of multiple scattering to a ground-based and a spaceborne monostatic lidar returns from clear atmosphere obscured by cumulus, stratus or cirrus clouds is assessed at the wavelength of 0.532 μm. The significant presence of multiple scattering in lidar returns and its dependence on the characteristics of the sounded clouds are demonstrated. High anisotropy of scattering in the forward direct ion by polydispersions of large nonspherical ice crystals is the basis of a tangible effect of multiple scattering for small values of the lidar receiver field of view. The radiation scattered by the crystal particles within a narrow cone around the forward direct ion is predominant and is greater than the corresponding values for scattering on water droplets. For cumulus and stratus clouds, the contribution of triple-scattered photons and higher to the total echo signal increases with increasing field of view of the receiver. The magnitude of multiple scattering effects is also seen to be largely determined by the optical depth across the receiver field of view at the cloud.

show abstract

Section: Modeling Results: Effects Of Multiple Scatteringmentioning

confidence: 99%

Modeling of laser pulse propagation in clouds taking into account multiple scattering

Russkova

Kan

2022

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

View full text Add to dashboard Cite

show abstract

“…The scattering amplitude matrix of an ice crystal with a fixed orientation is defined as

\left(\begin{array}{@{}c@{}}{\mathrm{E}}_{{\Vert} }^{s}\\ {\mathrm{E}}_{\perp }^{s}\end{array}\right)=\frac{\mathrm{exp}(ikr)}{-ikr}\left[\begin{array}{@{}cc@{}}{S}_{2}& {S}_{3}\\ {S}_{4}& {S}_{1}\end{array}\right]\left(\begin{array}{@{}c@{}}{\mathrm{E}}_{{\Vert} }^{i}\\ {\mathrm{E}}_{\perp }^{i}\end{array}\right),

where the reciprocity relation of S 4 ( π ) = − S 3 ( π ) is satisfied at the backscattering angle. Then, the product of scattering amplitude matrix elements can be expressed in the form (Shishko et al., 2019)

{S}_{m}{S}_{n}^{\ast }=\sum\limits _{j}{S}_{m}^{j}{S}_{n}^{j\ast }+\sum\limits _{j}\sum\limits _{l,l\ne j}{S}_{m}^{j}{S}_{n}^{l\ast }.

…”

Section: Methodsmentioning

confidence: 99%

Quantifying the Impact of the Surface Roughness of Hexagonal Ice Crystals on Backscattering Properties for Lidar‐Based Remote Sensing Applications

Saito,

Yang

2023

Geophysical Research Letters

View full text Add to dashboard Cite

Impacts of small‐scale surface irregularities, or surface roughness, of atmospheric ice crystals on lidar backscattering properties are quantified. Geometric ice crystal models with various degrees of surface roughness and state‐of‐the‐science light‐scattering computational capabilities are utilized to simulate the single‐scattering properties across the entire practical size parameter range. The simulated bulk lidar and depolarization ratios of polydisperse ice crystals at wavelength 532 nm are strongly sensitive to the degree of surface roughness. Comparisons of these quantities between the theoretical simulations and counterparts inferred from spaceborne lidar observations for cold cirrus clouds suggest a typical surface‐roughness‐degree range of 0.03–0.15 in the cases of compact hexagonal ice crystals, which is most consistent with direct measurements of scanning electron microscopic images. To properly interpret lidar backscattering observations of ice clouds, it is necessary to account for the degree of surface roughness in light‐scattering computations involving ice crystals.

show abstract

“…Moreover to calculate immeasurable variety of atmospheric crystals shape and size is a large problem. There is a work where the particle with average light scattering matrix elements at all direction within the geometric optics approximation was found over 400 particles with different shapes 50 . This particle shape was used in this study to reduce the number of calculations (Fig.…”

Section: Calculationsmentioning

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

View full text Add to dashboard Cite

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.

show abstract

Coherent and incoherent backscattering by a single large particle of irregular shape

Cited by 31 publications

References 9 publications

Modeling of laser pulse propagation in clouds taking into account multiple scattering

Modeling of laser pulse propagation in clouds taking into account multiple scattering

Quantifying the Impact of the Surface Roughness of Hexagonal Ice Crystals on Backscattering Properties for Lidar‐Based Remote Sensing Applications

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

Contact Info

Product

Resources

About