Detection of ice crystal particles preferably oriented in the atmosphere by use of the specular component of scattered light

Borovoi, Anatoli G.; Galileiskii, Viktor P.; Morozov, Andrey; Cohen, Ariel

doi:10.1364/oe.16.007625

Cited by 13 publications

(3 citation statements)

References 17 publications

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“…Analysis of the glare width shows the correspondence to the Gaussian distribution of crystal inclination with the half-width about 0.4 degrees (Lavigne et al, 2008;Breon and Dubrulle, 2004). Presence of horizontally oriented crystals is also detected when observing specular spots from the spotlight on the clouds (Borovoi et al, 2008); flutter width is also estimated at 0.4°. However, lidar observations of the ice clouds provide the basic information about particle orientation (Platt et al, 1978;Noel and Sassen, 2005;Chen et al, 2002).…”

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confidence: 64%

“…in general terms should correspond to distribution of specularly reflecting particles along the angles of deviation from the horizontal plane (flutter). However, due to the phenomenon of backscattered radiation diffraction on the particle's contour (Borovoi et al, 2008), the distribution is wider than the distribution of particles along the angles of inclination. In addition, the ratio of backscattering coefficients (color ratio) for α >> 4 (and for randomly oriented particles in any direction) is not equal to unity (Borovoi et al, 2014;Vaughan et al, 2010;Tao et al, 2008).…”

Section: Angular Distributions For Green and Infrared Wavelengthsmentioning

confidence: 99%

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Scanning Polarization Lidar LOSA-M3: Opportunity for Research of Crystalline Particle Orientation in the Clouds of Upper Layers

Kokhanenko¹,

Balin²,

Klemasheva³

et al. 2019

Preprint

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Abstract. The article describes a scanning polarization lidar LOSA-M3, developed at the Institute of Atmospheric Optics, the Siberian Branch of Russian Academy of Sciences (IAO SB RAS). The first results of studying the crystalline particles orientation by means of this lidar are presented herein. The main features of LOSA-M3 lidar are the following: 1) an automatic scanning device, which allows to change the sounding direction in the upper hemisphere at the speed up to 1.5 degrees per second with the accuracy of angle measurement setting at least 1 arc minute; 2) separation of polarization components of the received radiation is carried out directly behind the receiving telescope, without installing the elements distorting polarization, such as dichroic mirrors and beamsplitters; and 3) continuous alternation of the initial polarization state (linear - circular) from pulse to pulse that makes it possible to evaluate some elements of the scattering matrix. Several series of measurements of the ice cloud structure of the upper layers in the zenith scan mode were carried out in Tomsk in April-October 2018. The results show that the degree of horizontal orientation of particles can vary significantly in different parts of the cloud. The dependence of signal intensity on the tilt angle reflects the distribution of particle deflection relative to the horizontal plane, and is well described by the exponential dependence. The values of cross-polarized component in most cases show a weak decline of intensity with the angle. However, these variations are smaller than the measurement errors. We can conclude that it is practically independent of the tilt angle. In most cases the scattering intensity at the wavelength of 532 nm has a wider distribution than at 1064 nm.

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confidence: 64%

Section: Angular Distributions For Green and Infrared Wavelengthsmentioning

confidence: 99%

Scanning Polarization Lidar LOSA-M3: Opportunity for Research of Crystalline Particle Orientation in the Clouds of Upper Layers

Kokhanenko¹,

Balin²,

Klemasheva³

et al. 2019

Preprint

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“…In our recent paper [ Borovoi et al , 2008], we emphasized that the light scattered by crystals with preferential orientation is split into two qualitatively different parts called the specular and diffuse components. This is the specular component that is mostly informative for retrieving flutter parameters.…”

Section: Introductionmentioning

confidence: 99%

Display of ice crystal flutter in atmospheric light pillars

Borovoi¹,

Kustova²

2009

Geophysical Research Letters

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Specular patterns in the atmosphere caused by ice crystals with preferably horizontal orientation are quantitatively described by use of a bidirectional phase function for a fluttering plate. The main qualitative features of the sun pillars and overground light pillars are explained. Possibilities to retrieve the probability density for orientation of the preferably oriented crystals from the specular patterns are discussed.

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Application of polarization lidars to study the orientation of crystalline particles in ice clouds

Kokhanenko

Balin

Borovoi

et al. 2021

XV International Conference on Pulsed Lasers and Laser Applications

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Detection of ice crystal particles preferably oriented in the atmosphere by use of the specular component of scattered light

Cited by 13 publications

References 17 publications

Scanning Polarization Lidar LOSA-M3: Opportunity for Research of Crystalline Particle Orientation in the Clouds of Upper Layers

Scanning Polarization Lidar LOSA-M3: Opportunity for Research of Crystalline Particle Orientation in the Clouds of Upper Layers

Display of ice crystal flutter in atmospheric light pillars

Application of polarization lidars to study the orientation of crystalline particles in ice clouds

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