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Light scattering by small feldspar particles simulated using the Gaussian random sphere geometry
SMHI, Forskningsavdelningen, Luftmiljö.ORCID-id: 0000-0001-5695-1356
2006 (Engelska)Ingår i: Journal of Quantitative Spectroscopy and Radiative Transfer, ISSN 0022-4073, E-ISSN 1879-1352, Vol. 100, nr 1-3, s. 393-405Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The single-scattering properties of Gaussian random spheres are calculated using the discrete dipole approximation. The ensemble of model particles is assumed to be representative for a feldspar dust sample that is characteristic for weakly absorbing irregularly shaped mineral aerosol. The morphology of Gaussian random spheres is modeled based on a statistical shape analysis using microscope images of the dust sample. The size distribution of the dust sample is based on a particle sizing experiment. The refractive index of feldspar is estimated using literature values. All input parameters used in the light scattering simulations are thus obtained in an objective way based on the true properties of the mineral sample. The orientation-averaged and ensemble-averaged scattering matrices and cross sections of the Gaussian random spheres are compared with light scattering simulations using spheroidal shape models which have been shown to be applicable to the feldspar sample. The Gaussian random sphere model and the spheroidal shape model are assessed using the measured scattering matrix of the feldspar dust sample as a reference. Generally, the spheroidal model with strongly elongated prolate and strongly flattened oblate shapes agrees better with the measurement than the Gaussian random sphere model. In contrast, some features that are characteristic for light scattering by truly irregular mineral dust particles are rendered best by the Gaussian random sphere model; these features include the flat shape of the phase function and a minimum in the scattering matrix element F-22/F-11 as a function of the scattering angle. (c) 2005 Elsevier Ltd. All rights reserved.

Ort, förlag, år, upplaga, sidor
2006. Vol. 100, nr 1-3, s. 393-405
Nyckelord [en]
light scattering, irregular, atmospheric aerosol, mineral dust, desert dust, volcanic ash, solar radiation, remote sensing, polarimetry
Nationell ämneskategori
Meteorologi och atmosfärforskning
Forskningsämne
Miljö
Identifikatorer
URN: urn:nbn:se:smhi:diva-795DOI: 10.1016/j.jqsrt.2005.11.053ISI: 000236892800038OAI: oai:DiVA.org:smhi-795DiVA, id: diva2:807036
Konferens
8th Conference on Electromagnetic and Light Scattering by Nonspherical Particles, MAY 16-20, 2005, Granada, SPAIN
Tillgänglig från: 2015-04-22 Skapad: 2015-04-22 Senast uppdaterad: 2017-12-04Bibliografiskt granskad

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Kahnert, Michael

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