Report of Falcon Flight 19 April 2010

Report of Falcon Flight 19 April 2010 p r o u d l y b r o u g h t t o y o u b y oooo ooooooooooo ooooooooooo ooooooooooo oo oooooo oooo oooo 888ooooo ooooooo 888 888 888 888 888 888 888 888 888 888 888 888 ooooo888 888 888 888 888 888 888 888 888 888 888 888 888 888 o888o 8888 o888ooo88 88ooo88 8o 888 888 888 o8o888 Report of Falcon Flight 19 April 2010 U. Schumann, H. Schlager, B. Weinzierl, O. Reitebuch, A. Minikin, H. Huntrieser, T. Sailer, H. Mannstein DLR-Institut für Physik der Atmosphäre, Oberpfaffenhofen A successful Falcon measurement flight was performed on 19 April 2010 for probing plumes over Germany from the Iceland Eyjafjallajökull volcano eruption. Layers of volcanic ash were detected by Lidar and probed in-situ with aerosol instruments. Under suitable viewing conditions, the ash layer was visible as a brownish layer to the observer. The horizontal and vertical distributions of the volcano layers were variable. In the plume layers particles larger than 3µm were detected at concentrations, not present in the free troposphere during unpolluted conditions. The concentrations of large particles measured in the volcano layers are comparable to concentrations measured typically in Saharan dust plumes but smaller compared to particle concentrations in the polluted boundary layer. An estimation of the particle mass concentration in the volcanic ash plume probed as part of a vertical profile over Leipzig at about 4 km altitude yield 60 µg/m3. After the flight the Falcon was inspected. So far no damages were observed including engines (after boroscopy) and windows. Further engine inspection is ongoing. Silver foils attached to under-wing stations showed no visible impact from volcanic ash. Comment: Finally some scientific facts in this ocean of confusion around the volcanic eruption in Iceland. tags: Falcon flight DLR volcano eruption Iceland volcanic ash Eyjafjallajökull troposphere pollution airspace grounding particle 2010

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