Atmospheric Chemistry and Physics, vol. 11, issue 6 (2011) pp. 2689-2701
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 shallowlayer of only several hundreds of metres thick- ness which was oriented slantwise in the middle troposphere and whichwas brought downward by large-scale sinking mo- tion over Southern Germany and the Alps. Special Raman lidar measurements, trajectory analyses and in-situ obser- vations from mountain observatories helped to confirm the volcanic origin of the detected aerosol layer. Ultralight air- craft 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 MCCMwere able to reproduce the temporal and spa- tial structure of the ash layer. Comparisons of the model re- sults 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.
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