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| Titel |
Lidar measurements carried out during the 28 February 2013 lava fountain event at Mt. Etna, in Italy |
| VerfasserIn |
Simona Scollo, Antonella Boselli, Mauro Coltelli, Giuseppe Leto, Gianluca Pisani, Nicola Spinelli, Xuan Wang, Ricardo Zanmar Sanchez |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250110163
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| Publikation (Nr.) |
 EGU/EGU2015-10137.pdf |
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| Zusammenfassung |
| Mt. Etna, in Italy, is one of the most active volcanoes in the world. Since 2011, the New
South East Crater produced lava fountains that formed eruption columns rising up to several
kilometers above sea level and fine ash dispersed hundreds kilometers away from the central
craters. One of these events occurred during the 28 February 2013. The volcanic plume was
directed toward the E and reached, during the climax phase, an height greater than 9 km
above sea level. Lidar measurements were performed immediately after the lava fountain
activity by a new portable Raman scanning Lidar system that is operating in Catania
since 2013. The Lidar is operated at the Serra La Nave station, only 7 km away far
from the Etna summits, and, during the winter seasons, at the INAF-Astrophysical
Observatory in Catania. The Lidar named AMPLE is a portable multiwavelength scanning
lidar system with depolarization measurement capability, able to carry out high
quality 3D map of particle optical and microphysical properties. The laser source is a
doubled and tripled diode pumped Nd:YAG laser, with a repetition rate of 1KHz. The
Lidar system detects the elastic Lidar returns at 355nm and the N2 Raman Lidar
echoes at 386nm. Each signal is acquired with a raw spatial resolution varying from
30cm to 30m. Results of the measurements performed on 28 February 2013 show
different layers: the first layer below 1.5 km corresponds to smaller not depolarizing
particles of local origin while the layer up to 7 km, is related to volcanic ash coming
from Etna. A discrimination between spherical and non-spherical particles in the
volcanic plume is clear from the aerosol depolarization values in the atmospheric
column interested by the volcanic plume. Some differences in the aerosol size and
typology are also highlighted by the Lidar Ratio values. Lidar measurements presented
here show new insights on the plume dynamics during Etna lava fountain events. |
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