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

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

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

Abstract

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.

Document Type:Article
Title:Dual-wavelength linear depolarization ratio of volcanic aerosols: Lidar measurements of the Eyjafjallajökull plume over Maisach, Germany
Authors:
AuthorsInstitution or Email of Authors
Groß, SilkeUNSPECIFIED
Freudenthaler, VolkerLMU, München
Wiegner, MatthiasLMU, München
Gasteiger, JosefLMU, München
Geiß, AlexanderLMU, München
Schnell, FranziskaLMU, München
Date:2012
Journal or Publication Title:Atmospheric Environment
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:48
DOI:10.1016/j.atmosenv.2011.06.017
Page Range:pp. 85-96
Status:Published
Keywords:Volcanic ash, lidar measurements, depolarization, lidar ratio, remote sensing
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Silke Martha Groß
Deposited On:29 Dec 2011 14:09
Last Modified:04 Apr 2013 16:33

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