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Modelling light scattering by mineral dust using spheroids: assessment of applicability
SMHI, Research Department, Air quality.ORCID iD: 0000-0001-5695-1356
2011 (English)In: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 11, no 11, 5347-5363 p.Article in journal (Refereed) Published
Abstract [en]

We study the applicability of spheroidal model particles for simulating the single-scattering optical properties of mineral dust aerosols. To assess the range of validity of this model, calculations are compared to laboratory observations for five different dust samples at two wavelengths. We further investigate whether the best-fit shape distributions of spheroids for different mineral dust samples have any similarities that would allow us to suggest a generic first-guess shape distribution for suspended mineral dust. We find that best-fit shape distributions vary considerably between samples and even between wavelengths, making definitive suggestions for a shape distribution difficult. The best-fit shape distribution also depends strongly on the refractive index assumed and the cost function adopted. However, a power-law shape distribution which favours those spheroids that depart most from the spherical shape is found to work well in most cases. To reproduce observed asymmetry parameters, best results are obtained with a power-law shape distribution with an exponent around three.

Place, publisher, year, edition, pages
2011. Vol. 11, no 11, 5347-5363 p.
National Category
Meteorology and Atmospheric Sciences
Research subject
Environment
Identifiers
URN: urn:nbn:se:smhi:diva-544DOI: 10.5194/acp-11-5347-2011ISI: 000291636400016OAI: oai:DiVA.org:smhi-544DiVA: diva2:805430
Available from: 2015-04-15 Created: 2015-04-15 Last updated: 2016-11-21Bibliographically approved

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Kahnert, Michael
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