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- Title
Optical properties of long-range transported volcanic ash over Romania and Poland during Eyjafjallajökull eruption in 2010.
- Authors
Nemuc, Anca; Stachlewska, Iwona; Vasilescu, Jeni; Górska, Anna; Nicolae, Doina; Talianu, Camelia
- Abstract
After Eyjafjallajökull volcano eruption on 14 April 2010, due to a complex air mass circulation, Romania was exposed to volcanic ash and its mixture with continental aerosols. Ash particles with an average Ångström (UV-VIS) exponent of 1.4 ± 0.2 and (VIS-IR) of 1.2 ± 0.3, a color ratio (VIS-UV) of 0.54 and (IR-VIS) of 0.49, an average particle depolarization value ∼9.4%, and a lidar ratio of 50 sr were retrieved on 18 April from multiwavelength Raman lidar measurements in Bucharest. Mixed volcanic ash with mineral dust particles advected from Sahara, depolarization ∼12%, Ångström (UV-VIS) exponent of 1.25 ± 0.25 and (VIS-IR) of 1.45 ± 0.25, an increased color ratio (VIS-UV) of 0.61, (IRVIS) of 0.39 and lidar ratio of 53 sr were identified on 28 April. From observations in Poland conducted by an elastic lidar at 532 nm and a ceilometer at 1064 nm we retrieved an average backscatter related Ångström (VIS-IR) exponent of 1.25 ± 0.35, and a color ratio (IR-VIS) of 0.53 in the layer at about 5.5 km during the night of 16/17 April, indicating fresh ash over Warsaw.
- Subjects
EYJAFJALLAJOKULL Volcano (Iceland); VOLCANIC ash, tuff, etc.; VOLCANIC eruptions; AIR masses; RAMAN scattering; CEILOMETER; BACKSCATTERING
- Publication
Acta Geophysica, 2014, Vol 62, Issue 2, p350
- ISSN
1895-6572
- Publication type
Article
- DOI
10.2478/s11600-013-0180-7