26 October 2010 Mix of volcanic ash and Saharan dust over Romania during Eyjafjallajökull eruption
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Located at a distance more than 3400Km from Iceland, where the eruption of Eyjafjallajökull volcano occurred, Romania was under the influence of volcanic ash transported by middle altitude air masses across Europe. Apart from two clear episodes on April 18 and April 21, 2010 the mix of volcanic ash with Saharan dust was detected by the multiwavelength Raman lidar in Bucharest. Optical properties of aerosol layers for these particular cases showed an increase of the linear particle depolarization, as well as a decrease of the Angstrom exponent, compared with the pure long-range transported volcanic ash. The case of May 5th, 2010 is analyzed from lidar and ground-level data, accounting for layer dynamics, optical properties and chemical composition. Using high resolution lidar data we could make a clear distinction between ash and dust layers up to their mixing in the PBL. In order to account for similarities and differences, the same analysis was done for May 10th and 11th, when several distinct layers were depicted. The signature of ash (sulfate) was identified by Aerosol Mass Spectrometer at ground-level, on May 5th and May 11th.
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Doina Nicolae, Doina Nicolae, Anca Nemuc, Anca Nemuc, L. Belegante, L. Belegante, "Mix of volcanic ash and Saharan dust over Romania during Eyjafjallajökull eruption", Proc. SPIE 7832, Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing VI, 78320N (26 October 2010); doi: 10.1117/12.869021; https://doi.org/10.1117/12.869021

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