9 November 2010 Characterization of the Eyjafjallajökull ash-plume by means of lidar measurements over the Munich EARLINET-site
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Abstract
Measurements of the Eyjafjallajokull-plume were - from the beginning - continuously conducted at Munich, Germany, with two EARLINET Raman- and depolarization-lidars. By means of range corrected signals the temporal development of the ash-plume could be documented in real-time. The optical characterization includes the backscatter coefficient at three wavelengths (1064 nm, 532 nm, 355 nm), and the extinction coefficient and particle linear depolarization ratio at two (532 nm, 355 nm). The maximum extinction coefficient was as high as 0.75km-1 and wavelength independent - a strong indication for large particles. The particle linear depolarization ratio was 0.35-0.37, indicating non-spherical particles. An inversion of the optical data considering the nonspherical shape of ash particles led to a maximum mass concentration in the order of 1.1 mg/m3 over Munich, however, relative uncertainties of more than 30% must be expected.
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Silke Groß, Josef Gasteiger, Volker Freudenthaler, Franziska Schnell, Matthias Wiegner, "Characterization of the Eyjafjallajökull ash-plume by means of lidar measurements over the Munich EARLINET-site", Proc. SPIE 7832, Lidar Technologies, Techniques, and Measurements for Atmospheric Remote Sensing VI, 78320M (9 November 2010); doi: 10.1117/12.869020; https://doi.org/10.1117/12.869020
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KEYWORDS
LIDAR

Aerosols

Particles

Atmospheric modeling

Backscatter

Atmospheric particles

Mass attenuation coefficient

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