دورية أكاديمية
Optical properties and mineralogical composition of different Saharan mineral dust samples: a laboratory study
| العنوان: | Optical properties and mineralogical composition of different Saharan mineral dust samples: a laboratory study |
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| المؤلفون: | C. Linke, O. Möhler, A. Veres, Á. Mohácsi, Z. Bozóki, G. Szabó, M. Schnaiter |
| المصدر: | Atmospheric Chemistry and Physics, Vol 6, Iss 11, Pp 3315-3323 (2006) |
| بيانات النشر: | Copernicus Publications, 2006. |
| سنة النشر: | 2006 |
| المجموعة: | LCC:Physics LCC:Chemistry |
| مصطلحات موضوعية: | Physics, QC1-999, Chemistry, QD1-999 |
| الوصف: | 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=550 nm between 3.3±0.4 m2 g−1 and 3.7±0.4 m2 g−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=266 nm 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-%. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1680-7316 1680-7324 |
| Relation: | http://www.atmos-chem-phys.net/6/3315/2006/acp-6-3315-2006.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324 |
| URL الوصول: | https://doaj.org/article/d73e06cf5a1c44d797237f45495c66be |
| رقم الأكسشن: | edsdoj.73e06cf5a1c44d797237f45495c66be |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 16807316 16807324 |
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