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Light scattering by particles with small-scale surface roughness: Comparison of four classes of model geometries
SMHI, Forskningsavdelningen, Luftmiljö.ORCID-id: 0000-0001-5695-1356
SMHI, Forskningsavdelningen, Luftmiljö.ORCID-id: 0000-0002-5709-7507
2012 (Engelska)Ingår i: Journal of Quantitative Spectroscopy and Radiative Transfer, ISSN 0022-4073, E-ISSN 1879-1352, Vol. 113, nr 18, s. 86-97Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We compare four different model geometries for particles with small-scale surface roughness. The geometries are based on regular and stochastic surface perturbations, as well as on 2D- and 3D-roughness models. We further compare T-matrix and discrete dipole computations. Particle size parameters of 5 and 50 are considered, as well as refractive indices of 1.6+0.0005i and 3+0.1i. The effect of small-scale surface roughness on the intensity and polarisation of the scattered light strongly depends on the size parameter and refractive index. In general, 2D surface roughness models predict stronger effects than 3D models. Stochastic surface roughness models tend to predict the strongest depolarising effects, while regular surface roughness models can have a stronger effect on the angular distribution of the scattered intensity. Computations with the discrete dipole approximation only cover a limited range of size parameters. T-matrix computations allow us to significantly extend that range, but at the price of restricting the model particles to symmetric surface perturbations with small amplitudes. (C) 2012 Elsevier Ltd. All rights reserved.

Ort, förlag, år, upplaga, sidor
2012. Vol. 113, nr 18, s. 86-97
Nyckelord [en]
Scattering, Aerosols, T-matrix, Surface roughness, Mineral dust, Lidar
Nationell ämneskategori
Miljövetenskap
Forskningsämne
Miljö
Identifikatorer
URN: urn:nbn:se:smhi:diva-423DOI: 10.1016/j.jqsrt.2012.03.017ISI: 000312685700008OAI: oai:DiVA.org:smhi-423DiVA, id: diva2:806656
Konferens
13th Conference on Electromagnetic and Light Scattering (ELS), SEP 26-30, 2011, Taormina, ITALY
Tillgänglig från: 2015-04-21 Skapad: 2015-04-14 Senast uppdaterad: 2017-12-04Bibliografiskt granskad

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Kahnert, MichaelThomas, Manu Anna

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