Optical properties of Saharan dust layers as detected by a Raman lidar at Thessaloniki, Greece

Details Optical properties of Saharan dust layers as detected by a Raman lidar at Thessaloniki, Greece Optical properties of Saharan dust layers as detected by a Raman lidar at Thessaloniki, Greece

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3113104b&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 13, CiteID L13104

Physics

34

Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801), Global Change: Remote Sensing, Global Change: Atmosphere (0315, 0325), Global Change: Instruments And Techniques

Scientific paper

Measurements during Saharan dust transport events were performed at several stations of the European Aerosol Research Lidar Network. During the period 2001-2002, 12 cases were captured at Thessaloniki, Greece (40.5°N, 22.9°E) with a 355 nm Raman lidar. For these cases the vertical profiles of the extinction and backscatter coefficients were determined and examined, as well as profiles of extinction-to-backscatter ratio (lidar ratio) and the backscatter-related Ångström exponent between 355 and 532 nm (color index). Model calculations from the DREAM model confirmed the existence of Saharan dust in all cases examined. Within the dust plumes the lidar ratios ranged from 20 to 100 sr and the color index ranged from -1 to 3. An anticorrelation was found between the lidar ratio and the color index during the Saharan dust events. In certain cases the results suggest that the mixing of dust particles with boundary layer aerosols reduces the dust `signature' and thus, makes difficult the separation of the dust particles from those of mostly urban origin.

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