Effects of Surface Roughness with Two Scales on Light Scattering by Hexagonal Ice Crystals Large Compared to the Wavelength: DDA Results

Christopher T. Collier; Evelyn Hesse; Laurence Taylor; Zbigniew Ulanowski; Antti Penttila; Timo Nousiainen

doi:10.1016/j.jqsrt.2016.06.007

Effects of Surface Roughness with Two Scales on Light Scattering by Hexagonal Ice Crystals Large Compared to the Wavelength: DDA Results

Christopher T. Collier, Evelyn Hesse, Laurence Taylor, Zbigniew Ulanowski, Antti Penttila, Timo Nousiainen

Research output: Contribution to journal › Article › peer-review

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Abstract

The effect of ice crystal surface roughness on light scattering by ice crystals which are large compared to the wavelength was studied, in particular changes to the 2D scattering patterns, azimuthally averaged phase functions, degree of linear polarisation patterns and asymmetry parameters for a range of orientations and roughness scales. It was found that roughness has an effect on light scattering by hexagonal prisms, particularly when the roughness features are of comparable size to the wavelength. The roughness model that has the most effect on light scattering takes account of more than one roughness scale.
Rough geometry was implemented by a Gaussian roughness method that took roughness parameters derived from sand grains, which have been reported to be suitable proxies for rough ice crystals. Light scattering data for these geometries was computed using the ADDA discrete dipole approximation method.

Original language	English
Pages (from-to)	225–239
Journal	Journal of Quantitative Spectroscopy and Radiative Transfer
Volume	182
Early online date	9 Jun 2016
DOIs	https://doi.org/10.1016/j.jqsrt.2016.06.007
Publication status	Published - 1 Oct 2016

Keywords

light scattering, rough ice crystals, cirrus, DDA

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10.1016/j.jqsrt.2016.06.007Licence: CC BY

Collier_etal2016JQSRTFinal published version, 7.81 MBLicence: CC BY

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title = "Effects of Surface Roughness with Two Scales on Light Scattering by Hexagonal Ice Crystals Large Compared to the Wavelength: DDA Results",

abstract = "The effect of ice crystal surface roughness on light scattering by ice crystals which are large compared to the wavelength was studied, in particular changes to the 2D scattering patterns, azimuthally averaged phase functions, degree of linear polarisation patterns and asymmetry parameters for a range of orientations and roughness scales. It was found that roughness has an effect on light scattering by hexagonal prisms, particularly when the roughness features are of comparable size to the wavelength. The roughness model that has the most effect on light scattering takes account of more than one roughness scale.Rough geometry was implemented by a Gaussian roughness method that took roughness parameters derived from sand grains, which have been reported to be suitable proxies for rough ice crystals. Light scattering data for these geometries was computed using the ADDA discrete dipole approximation method.",

keywords = "light scattering, rough ice crystals, cirrus, DDA",

author = "Collier, {Christopher T.} and Evelyn Hesse and Laurence Taylor and Zbigniew Ulanowski and Antti Penttila and Timo Nousiainen",

note = "{\textcopyright} 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). C. T. Collier, E. Hesse, L. Taylor, Z. Ulanowski, A. Penttila, and T. Nousiainen, 'Effects of surface roughness with two scales on light scattering by hexagonal ice crystals large compared to the wavelength: DDA results', Journal of Quantitative Spectroscopy & Radiative Transfer, Vol. 182, June 2016, pp. 225-239, doi: http://dx.doi.org/10.1016/j.jqsrt.2016.06.007",

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Effects of Surface Roughness with Two Scales on Light Scattering by Hexagonal Ice Crystals Large Compared to the Wavelength: DDA Results. / Collier, Christopher T.; Hesse, Evelyn; Taylor, Laurence et al.
In: Journal of Quantitative Spectroscopy and Radiative Transfer, Vol. 182, 01.10.2016, p. 225–239.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Effects of Surface Roughness with Two Scales on Light Scattering by Hexagonal Ice Crystals Large Compared to the Wavelength: DDA Results

AU - Collier, Christopher T.

AU - Hesse, Evelyn

AU - Taylor, Laurence

AU - Ulanowski, Zbigniew

AU - Penttila, Antti

AU - Nousiainen, Timo

N1 - © 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). C. T. Collier, E. Hesse, L. Taylor, Z. Ulanowski, A. Penttila, and T. Nousiainen, 'Effects of surface roughness with two scales on light scattering by hexagonal ice crystals large compared to the wavelength: DDA results', Journal of Quantitative Spectroscopy & Radiative Transfer, Vol. 182, June 2016, pp. 225-239, doi: http://dx.doi.org/10.1016/j.jqsrt.2016.06.007

PY - 2016/10/1

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N2 - The effect of ice crystal surface roughness on light scattering by ice crystals which are large compared to the wavelength was studied, in particular changes to the 2D scattering patterns, azimuthally averaged phase functions, degree of linear polarisation patterns and asymmetry parameters for a range of orientations and roughness scales. It was found that roughness has an effect on light scattering by hexagonal prisms, particularly when the roughness features are of comparable size to the wavelength. The roughness model that has the most effect on light scattering takes account of more than one roughness scale.Rough geometry was implemented by a Gaussian roughness method that took roughness parameters derived from sand grains, which have been reported to be suitable proxies for rough ice crystals. Light scattering data for these geometries was computed using the ADDA discrete dipole approximation method.

AB - The effect of ice crystal surface roughness on light scattering by ice crystals which are large compared to the wavelength was studied, in particular changes to the 2D scattering patterns, azimuthally averaged phase functions, degree of linear polarisation patterns and asymmetry parameters for a range of orientations and roughness scales. It was found that roughness has an effect on light scattering by hexagonal prisms, particularly when the roughness features are of comparable size to the wavelength. The roughness model that has the most effect on light scattering takes account of more than one roughness scale.Rough geometry was implemented by a Gaussian roughness method that took roughness parameters derived from sand grains, which have been reported to be suitable proxies for rough ice crystals. Light scattering data for these geometries was computed using the ADDA discrete dipole approximation method.

KW - light scattering, rough ice crystals, cirrus, DDA

U2 - 10.1016/j.jqsrt.2016.06.007

DO - 10.1016/j.jqsrt.2016.06.007

M3 - Article

SN - 0022-4073

VL - 182

SP - 225

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JO - Journal of Quantitative Spectroscopy and Radiative Transfer

JF - Journal of Quantitative Spectroscopy and Radiative Transfer

ER -

Effects of Surface Roughness with Two Scales on Light Scattering by Hexagonal Ice Crystals Large Compared to the Wavelength: DDA Results

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