Optical properties and mineralogical composition of different Saharan mineral dust samples

A laboratory study

C. Linke, O. Möhler, A. Veres, A. Mohácsi, Z. Bozóki, G. Szabó, M. Schnaiter

Research output: Contribution to journalArticle

90 Citations (Scopus)

Abstract

In aerosol chamber experiments optical properties of resuspended mineral dust samples of defined size distributions were measured. Extinction coefficients (bext) and mass specific extinction cross sections (σext) were determined for Saharan dust samples from different locations. The results for σext were not very sensitive to the type of dust and varied at λ=550nm between 3.3±0.4m 2g-1 and 3.7±0.4m2g-1. The absorption coefficients (babs) and mass specific absorption cross sections (σabs) were determined with a novel multi-wavelength photo-acoustic absorption spectrometer (PAS). The single scattering albedo was close to 1 (0.98 to 0.99) at 532 nm and 1064 nm, but significantly lower (0.63 to 0.76) at 266 nm. Additionally the chemical and mineralogical composition of the dust samples were analysed with special regard to the iron oxide phases hematite and goethite. At λ=266nm the mineral dust sample without any detectable iron oxides showed a significantly higher SSA compared to the sample with a hematite content of 0.6 wt-%.

Original languageEnglish
Pages (from-to)3315-3323
Number of pages9
JournalAtmospheric Chemistry and Physics
Volume6
Issue number11
Publication statusPublished - 2006

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optical property
dust
mineral
iron oxide
hematite
cross section
extinction coefficient
absorption coefficient
goethite
albedo
spectrometer
acoustics
extinction
scattering
laboratory
aerosol
wavelength
experiment

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Optical properties and mineralogical composition of different Saharan mineral dust samples : A laboratory study. / Linke, C.; Möhler, O.; Veres, A.; Mohácsi, A.; Bozóki, Z.; Szabó, G.; Schnaiter, M.

In: Atmospheric Chemistry and Physics, Vol. 6, No. 11, 2006, p. 3315-3323.

Research output: Contribution to journalArticle

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