Measurement and simulation of the 16/17 April 2010 Eyjafjallajökull volcanic ash layer dispersion in the northern Alpine region 1Institute for Meteorology and Climate Research (IMK-IFU), Karlsruhe Institute of Technology, Garmisch-Partenkirchen, Germany
22 Mar 2011
2DWD German Meteorological Service, Offenbach and Hohenpeißenberg, Germany
3Meteorological Institute, Ludwig-Maximilians-Universität Munich (MIM), Germany
4UBA Federal Environmental Agency, Germany
5Leibniz Institut für Tropospheric Research, Leipzig, Germany
6Vaisala GmbH, Hamburg, Germany
7IMG-IBK Institute for Meteorology and Geophysics, University of Innsbruck, Austria
Received: 22 Oct 2010 – Published in Atmos. Chem. Phys. Discuss.: 04 Nov 2010 Abstract. The spatial structure and the progression speed of the first ash layer from
the Icelandic Eyjafjallajökull volcano which reached Germany on 16/17 April is investigated from remote sensing data and numerical simulations.
The ceilometer network of the German Meteorological Service was able to
follow the progression of the ash layer over the whole of Germany. This
first ash layer turned out to be a rather shallow layer of only several
hundreds of metres thickness which was oriented slantwise in the middle
troposphere and which was brought downward by large-scale sinking motion
over Southern Germany and the Alps. Special Raman lidar measurements,
trajectory analyses and in-situ observations from mountain observatories
helped to confirm the volcanic origin of the detected aerosol layer.
Ultralight aircraft measurements permitted the detection of the arrival of a
second major flush of volcanic material in Southern Germany. Numerical
simulations with the Eulerian meso-scale model MCCM were able to reproduce
the temporal and spatial structure of the ash layer. Comparisons of the
model results with the ceilometer network data on 17 April and with the
ultralight aircraft data on 19 April were satisfying. This is the first
example of a model validation study from this ceilometer network data.
Revised: 24 Feb 2011 – Accepted: 07 Mar 2011 – Published: 22 Mar 2011
Citation: Emeis, S., Forkel, R., Junkermann, W., Schäfer, K., Flentje, H., Gilge, S., Fricke, W., Wiegner, M., Freudenthaler, V., Groβ, S., Ries, L., Meinhardt, F., Birmili, W., Münkel, C., Obleitner, F., and Suppan, P.: Measurement and simulation of the 16/17 April 2010 Eyjafjallajökull volcanic ash layer dispersion in the northern Alpine region, Atmos. Chem. Phys., 11, 2689-2701, doi:10.5194/acp-11-2689-2011, 2011.