EARLINET observations of the Eyjafjallajökull ash plume over Greece

Balis, D; Giannakaki, E; Mamouri, RE; Kokkalis, P; Papayannis, A; Tsaknakis, G

dc.contributor.author	Balis, D	en
dc.contributor.author	Giannakaki, E	en
dc.contributor.author	Mamouri, RE	en
dc.contributor.author	Kokkalis, P	en
dc.contributor.author	Papayannis, A	en
dc.contributor.author	Tsaknakis, G	en
dc.date.accessioned	2014-03-01T02:52:39Z
dc.date.available	2014-03-01T02:52:39Z
dc.date.issued	2010	en
dc.identifier.issn	0277786X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/35977
dc.subject	Aerosols	en
dc.subject	EARLINET	en
dc.subject	Eyjafjallajökull	en
dc.subject	Iceland	en
dc.subject	Raman lidar	en
dc.subject.other	Aerosol layers	en
dc.subject.other	Ash aerosol	en
dc.subject.other	Ash layer	en
dc.subject.other	Ash plumes	en
dc.subject.other	Central Europe	en
dc.subject.other	Complicated structures	en
dc.subject.other	EARLINET	en
dc.subject.other	Ground level	en
dc.subject.other	Icelands	en
dc.subject.other	Lidar measurements	en
dc.subject.other	Multiwavelength	en
dc.subject.other	Northern Italy	en
dc.subject.other	Raman LIDAR	en
dc.subject.other	Raman lidar system	en
dc.subject.other	Saharan dust	en
dc.subject.other	Southern Italy	en
dc.subject.other	Thessaloniki	en
dc.subject.other	Thin layers	en
dc.subject.other	Two layers	en
dc.subject.other	Variable thickness	en
dc.subject.other	Volcanic ash	en
dc.subject.other	Volcanic eruptions	en
dc.subject.other	Atmospheric aerosols	en
dc.subject.other	Atmospherics	en
dc.subject.other	Clouds	en
dc.subject.other	Optical properties	en
dc.subject.other	Optical radar	en
dc.subject.other	Remote sensing	en
dc.subject.other	Thin films	en
dc.subject.other	Volcanoes	en
dc.title	EARLINET observations of the Eyjafjallajökull ash plume over Greece	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1117/12.882450	en
heal.identifier.secondary	http://dx.doi.org/10.1117/12.882450	en
heal.publicationDate	2010	en
heal.abstract	The arrival of the volcanic ash plume of the Eyjafjallajökull eruption was observed over Greece almost one week after its major eruption (on April 14, 2010) with two multi-wavelength Raman lidar systems, members of the EARLINET network. Intensive lidar measurements were performed throughout the event over Thessaloniki and Athens to derive the optical properties of the ash aerosols in the troposphere. During April 21, 2010 two layers of volcanic ash were present over Thessaloniki, one around 2.5 and one around 5 km height after circulating over central Europe. The first layer was persistent but with variable thickness, while the thin layer observed at 5 km height disappeared after some hours. Later on and at higher altitudes thin layers of ash were observed between 5 and 8 km, directly associated with the volcanic eruption. The observed layer at around and 3 km was persistently observed till April 28. The volcanic ash was observed over Athens, after passing over Southern Italy, during April and May 2010, in two height regions: between 6-10 km height and between 4 km and the ground level. We found that this was directly linked to the maximum height of the emitted volcanic ash. The most intensive period for ash presence over Athens was between April 21 and 23. In most cases, ash layers were very well stratified in the form of filaments starting around 3-4 km down to 1.5 km height. Mixing of ash with locally produced aerosols was frequently observed during the measuring period resulting to enhanced PM10 concentrations at ground level. Volcanic ash was also observed during May 10-11 and 17-19, 2010, after being transported over Spain and Northern Italy. Both over Athens and Thessaloniki Saharan dust particles were mixed with volcanic ones on certain days of May 2010, which resulted to more complicated structures of the aerosol layers observed over Greece.	en
heal.journalName	Proceedings of SPIE - The International Society for Optical Engineering	en
dc.identifier.doi	10.1117/12.882450	en
dc.identifier.volume	7827	en
dc.identifier.spage	xlviii	en
dc.identifier.epage	lv	en