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- Title
Optical properties and mineralogical composition of different Saharan mineral dust samples: a laboratory study.
- Authors
Linke, C.; Möhler, O.; Veres, A.; Mohácsi, Á.; Bozóki, Z.; Szabó, G.; Schnaiter, M.
- Abstract
In aerosol chamber experiments optical properties of airborne mineral dust samples of defined size distribution were measured. Extinction coefficients (bext) and mass specific extinction cross sections (δext) were determined for Saharan dust samples from different locations. The results for δext were not very sensitive to the type of dust and varied at λ=550nm between 3.3±0.4m² g-1 and 3.7±0.4m² g-1. The absorption coefficients (babs) and mass specific absorption cross sections (δabs) were determined with a novel multi-wavelength photo-acoustic absorption spectrometer (PAS). Between λ=266nm and λ=1064nm the derived single scattering albedos (SSA) ranged from 0.63±0.04 to 0.99±0.01. Additionally the chemical and mineralogical composition of the dust samples was 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-%.
- Subjects
AEROSOLS; MINERAL dusts; ABSORPTION; WAVELENGTHS; ALBEDO; MINERALOGY
- Publication
Atmospheric Chemistry & Physics Discussions, 2006, Vol 6, Issue 2, p2897
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acpd-6-2897-2006