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| Titel |
Lidar Observations During the Saharan Mineral Dust Experiments 1 and 2 |
| VerfasserIn |
M. Tesche, D. Althausen, A. Ansmann, R. Engelmann, D. Müller, V. Freudenthaler, S. Groß |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250019385
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| Zusammenfassung |
| Polarization Raman lidar measurements at various wavelengths were performed during the
Saharan Mineral Dust Experiment (SAMUM) 1 and 2 to study the optical properties of desert
dust aerosol. SAMUM 1 at the airport of Ouarzazate (30.9∘ N, 6.9∘ W, 1133 m height
above sea level, asl) in southern Morocco was devoted to the investigation fresh
desert dust. SAMUM 2 at the airport of Praia (15.0∘ N, 23.5∘ W, 75 m height asl),
Cape Verde focussed on the characterization of a mixture of aged dust from North
Africa and biomass burning aerosol from Central Africa. A large dataset of optical,
microphysical, and radiative properties of the respective aerosol types has been collected.
From the BERTHA measurements at Ouarzazare during May–June 2006 multiwavelengths
information of backscatter and extinction coefficients, and the resulting lidar ratio
were derived. The statistical analysis of the SAMUM 1 dataset reveals that the
dust layer depth typically reaches 4–6 km height asl, sometimes even 7 km asl. A
vertically inhomogeneous dust plume with internal dust layers was usually observed in
the morning before the evolution of the boundary layer starts. The Saharan dust
layer was well–mixed in the early evening. AERONET observations of these layers
showed an optical thickness ranging from 0.2–0.8 (at 500 nm, mean value 0.32). |
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