Modelling light scattering by mineral dust using spheroids: assessment of applicability
Item
Title (Dublin Core)
Modelling light scattering by mineral dust using spheroids: assessment of applicability
Description (Dublin Core)
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.
Creator (Dublin Core)
Merikallio, S.
Lindqvist, H.
Nousiainen, T.
Kahnert, M.
Date (Dublin Core)
2018-01-15
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-11-5347-2011
https://acp.copernicus.org/articles/11/5347/2011/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
