Backscatter ratios for arbitrary oriented hexagonal ice crystals of cirrus clouds

Borovoi, Anatoli G.; Konoshonkin, Alexander V.; Kustova, Natalia V.

doi:10.1364/ol.39.005788

Cited by 33 publications

(8 citation statements)

References 14 publications

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“…Note that in some literature (Flynn et al, 2007;Gimmestad, 2008;Roy et al, 2011;Gasteiger and Freudenthaler, 2014) the de-polarisation parameter d = (1 − a) is used, and in Borovoi et al (2014) d is called polarisation parameter. In Volkov et al (2015) e = a (for randomly oriented particles) is called sphericity index.…”

Section: Depolarising Atmospheric Aerosolmentioning

confidence: 99%

About the effects of polarising optics on lidar signals and the Δ90 calibration

2016

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Abstract. This paper provides a model for assessing the effects of polarising optics on the signals of typical lidar systems, which is based on the description of the individual optical elements of the lidar and of the state of polarisation of the light by means of the Müller–Stokes formalism. General analytical equations are derived for the dependence of the lidar signals on polarisation parameters, for the linear depolarisation ratio, and for the signals of different polarisation calibration setups. The equations can also be used for the calculation of systematic errors caused by nonideal optical elements, their rotational misalignment, and by non-ideal laser polarisation. We present the description of the lidar signals including the polarisation calibration in a closed form, which can be applied for a large variety of lidar systems.

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Section: Depolarising Atmospheric Aerosolmentioning

confidence: 99%

About the effects of polarising optics on lidar signals and the Δ90 calibration

2016

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“…The structure WNS-1 constructs a quasi-pentagonal ring [51] which formed three hydrogen bonds (HB) while the WSN-A forms a hexagonal ring [52][53][54][55][56] by means of three HB too. The 16 optimized geometries remaining of two groups -eight for each group-gave pentagonal (SI Fig.…”

Section: Resultsmentioning

confidence: 99%

Facet shapes and thermo-stabilities of H2SO4•HNO3 hydrates involved in polar stratospheric clouds

Verdes

Paniagua

2015

J Mol Model

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The nucleation, ice crystal shapes and thermodynamic stability of polar stratospheric clouds particles are interesting concerns owing to their implication in the ozone layer destruction. Some of these particles are formed by conformers of H2O, HNO3, and H2SO4. We carried out calculations using density functional theory (DFT) to obtain optimized structures. Several stable trimers are achieved -divided in two groups, one with HNO3 moiety, second with H2SO4 moiety- after pre-optimization at B3LYP/6-31G and subsequently optimization at B3LYP/aug-cc-pVTZ level of theory. For both most stable conformers five H2O molecules are added to their optimized trimers to calculate hydrated geometries. The OH stretching harmonic frequencies are provided for all aggregates. The zero-point energy correction (ZEPC), relative electronic energies (∆E), relative reaction Gibbs free energies ∆(∆G)k-relative, and cooling constant (K cooling ) are reported at three temperatures: 188 K, 195 K, and 210 K. Shapes given in our calculations are compared with various experimental shapes as well as comparisons with their thermo-stabilities.

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“…(11) can be used to find the effective tilt (with respect to the horizon) of the quasi-horizontally oriented plates. For this purpose, we have calculated L pl as a function of the effective tilt according to our papers [5,7], the results are presented in Fig. 6.…”

Section:  mentioning

confidence: 99%

Retrieving microphysics of cirrus clouds from data measured with raman lidar ramses and a tilted ceilometer

Borovoi¹,

Reichardt²,

Görsdorf³

et al. 2018

EPJ Web Conf.

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To develop a microphysical model of cirrus clouds, data obtained by Raman lidar RAMSES and a tilted ceilometer are studied synergistically. The measurements are interpreted by use of a data archive containing the backscattering matrixes as well as the depolarization, color and lidar ratios of ice crystals of different shapes, sizes and spatial orientations calculated within the physical-optics approximation.

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Backscatter ratios for arbitrary oriented hexagonal ice crystals of cirrus clouds

Cited by 33 publications

References 14 publications

About the effects of polarising optics on lidar signals and the Δ90 calibration

About the effects of polarising optics on lidar signals and the Δ90 calibration

Facet shapes and thermo-stabilities of H2SO4•HNO3 hydrates involved in polar stratospheric clouds

Retrieving microphysics of cirrus clouds from data measured with raman lidar ramses and a tilted ceilometer

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