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Dual-wavelength linear depolarization ratio of volcanic aerosols: Lidar measurements of the Eyjafjallajökull plume over Maisach, Germany

Groß, Silke und Freudenthaler, Volker und Wiegner, Matthias und Gasteiger, Josef und Geiß, Alexander und Schnell, Franziska (2012) Dual-wavelength linear depolarization ratio of volcanic aerosols: Lidar measurements of the Eyjafjallajökull plume over Maisach, Germany. Atmospheric Environment, 48, Seiten 85-96. DOI: 10.1016/j.atmosenv.2011.06.017.

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Offizielle URL: http://www.elsevier.com/locate/atmosenv

Kurzfassung

The ash plume of the Eyjafjallajökull eruption in April 2010 offered an exceptional opportunity to assess the potential of advanced lidar systems to characterize the volcanic aerosols. Consequently, the plume was continuously observed in the framework of EARLINET. In this paper we focus on the EARLINETRaman- depolarization-lidar measurements at Maisach near Munich, Germany. From these data sets the lidar ratio Sp and the particle linear depolarization ratio dp at two wavelengths (355 nm and 532 nm) were retrieved. These quantities can be used to characterize volcanic aerosols and to establish criteria for the discrimination from other aerosol types. In the pure volcanic ash plume, observed until noon of 17 April, wavelength independent values of dp as high as 0.35 < dp < 0.38, indicating non-spherical particles, were found, and lidar ratios of 50 < Sp < 60 sr at 355 nm and 45 < Sp < 55 sr at 532 nm. Later, volcanic aerosols were mixed into the boundary layer. This mixture showed in general lower values of dp as expected from the contribution of boundary layer aerosols. Especially noteworthy is the increase of dp with wavelength, when volcanic ash was mixed with small spherical particles.

Dokumentart:Zeitschriftenbeitrag
Titel:Dual-wavelength linear depolarization ratio of volcanic aerosols: Lidar measurements of the Eyjafjallajökull plume over Maisach, Germany
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Groß, SilkeNICHT SPEZIFIZIERT
Freudenthaler, VolkerLMU, München
Wiegner, MatthiasLMU, München
Gasteiger, JosefLMU, München
Geiß, AlexanderLMU, München
Schnell, FranziskaLMU, München
Datum:2012
Erschienen in:Atmospheric Environment
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:48
DOI :10.1016/j.atmosenv.2011.06.017
Seitenbereich:Seiten 85-96
Status:veröffentlicht
Stichwörter:Volcanic ash, lidar measurements, depolarization, lidar ratio, remote sensing
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Atmosphären- und Klimaforschung
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Lidar
Hinterlegt von: Silke Martha Groß
Hinterlegt am:29 Dez 2011 14:09
Letzte Änderung:04 Apr 2013 16:33

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