Comparison of the ray-tracing and beam-tracing methods in the problem of light scattering by ice crystals of cirrus clouds

2014 ◽  
Author(s):  
Natalia V. Kustova ◽  
Alexander V. Konoshonkin ◽  
Anatoli G. Borovoi
Keyword(s):  
Light Scattering ◽  
Ray Tracing ◽  
Cirrus Clouds ◽  
Ice Crystals

scholarly journals Monte Carlo simulation of halos in the crystal clouds

2021 ◽  
Vol 2099 (1) ◽  
pp. 012067
Author(s):  
Q Mu ◽  
E G Kablukova ◽  
B A Kargin ◽  
S M Prigarin
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Monte Carlo Method ◽  
Ray Tracing ◽  
Multiple Scattering ◽  
Radiation Transfer ◽  
Cirrus Clouds ◽  
Ice Crystals ◽  
The Sun ◽  
Different Shapes

Abstract In this paper, we try to answer the question: how the multiple scattering, the sun elevation, shape and orientation of ice crystals in the cirrus clouds affect a halo pattern. To study the radiation transfer in optically anisotropic clouds, we have developed the software based on Monte Carlo method and ray tracing. In addition to halos, this software enables one to simulate “anti-halos”, which above the cloud layer can be seen by observers. We present the visualization of halos and anti-halos generated by the cirrus clouds for different shapes and orientations of ice crystals.

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 single ice crystals of cirrus clouds

2006 ◽  
Vol 33 (15) ◽  
Author(s):  
Valery Shcherbakov ◽  
Jean-François Gayet ◽  
Olivier Jourdan ◽  
Johan Ström ◽  
Andreas Minikin
Keyword(s):  
Light Scattering ◽  
Cirrus Clouds ◽  
Ice Crystals

Light scattering by ice crystals of cirrus clouds: Jones matrix

2002 ◽  
Author(s):  
Anatoli G. Borovoi ◽  
Igor A. Grishin ◽  
Ulrich G. Oppel
Keyword(s):  
Light Scattering ◽  
Cirrus Clouds ◽  
Ice Crystals ◽  
Jones Matrix

scholarly journals The Asymmetry Parameter of Cirrus Clouds Composed of Hollow Bullet Rosette–Shaped Ice Crystals from Ray-Tracing Calculations

2006 ◽  
Vol 45 (7) ◽  
pp. 973-981 ◽  
Author(s):  
C. G. Schmitt ◽  
J. Iaquinta ◽  
A. J. Heymsfield
Keyword(s):  
Ray Tracing ◽  
Asymmetry Parameter ◽  
Total Surface Area ◽  
Cirrus Clouds ◽  
Ice Crystals ◽  
Parameter Estimates ◽  
Particle Volume ◽  
Atmospheric Radiation Measurement ◽  
Visible Wavelengths ◽  
Parameter Values

Abstract Cirrus clouds in the midlatitude and Arctic regions are often composed of bullet rosette–shaped ice crystals. Bullet rosette–shaped ice crystals are composed of a number of bullets radiating from a central point. The bullets that make up the rosette will grow to be hollow in some conditions. To understand better the radiative impact of cirrus clouds, the authors have used a ray-tracing code to calculate the scattering properties of solid and hollow bullet rosettes at visible wavelengths. Results show that hollow bullet rosettes exhibit a broader forward-scattering peak than do solid bullet rosettes. This difference results in an asymmetry parameter that is as much as 0.08 lower for hollow bullet rosettes than for solid rosettes. The effective asymmetry parameter of spheres with the same particle volume and total surface area of the bullet rosettes has also been calculated. Asymmetry parameter estimates for equivalent spheres were similar to those calculated using the ray tracing. Asymmetry parameter calculations were used in combination with direct aircraft measurements from the Atmospheric Radiation Measurement Program intensive operational period in March of 2000. Asymmetry parameter estimates were used with particle size distributions for three cirrus cloud flights for which the observed large particles were predominantly bullet rosettes. Calculated asymmetry parameter values (0.80–0.84) agreed poorly with published cirrus parameterizations (0.75–0.84) when applied to the same aircraft data. Differences lead to 4.5–9 W m−2 differences in reflected and transmitted visible light energy for a cloud of 0.5 optical depth.

Light scattering by absorbing hexagonal ice crystals in cirrus clouds

1995 ◽  
Vol 34 (25) ◽  
pp. 5867 ◽  
Author(s):  
Jianyun Zhang ◽  
Lisheng Xu
Keyword(s):  
Light Scattering ◽  
Cirrus Clouds ◽  
Ice Crystals ◽  
Hexagonal Ice

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.

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