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. Volcanic eruptions comprise an important airborne hazardfor aviation. Although significant events are rare, e.g. compared to thethreat of thunderstorms, they have a very high impact. The current state oftools and abilities to mitigate aviation hazards associated with an assumedvolcanic cloud was tested within an international demonstration exercise.Experts in the field assembled at the Schwarzenberg barracks in Salzburg,Austria, in order to simulate the sequence of procedures for the volcaniccase scenario of an artificial eruption of the Etna volcano in Italy. Thescope of the exercise ranged from the detection (based on artificialobservations) of the assumed event to the issuance of early warnings.Volcanic-emission-concentration charts were generated applying modernensemble techniques. The exercise products provided an important basis fordecision-making for aviation traffic management during a volcanic-eruptioncrisis. By integrating the available wealth of data, observations andmodelling results directly into widely used flight-planning software, itwas demonstrated that route optimization measures could be implementedeffectively. With timely and rather precise warnings available, the newtools and processes tested during the exercise demonstrated vividly that avast majority of flights could be conducted despite a volcanic plume being widelydispersed within a high-traffic airspace over Europe. The resulting numberof flight cancellations was minimal.

A volcanic-hazard demonstration exercise to assess and mitigate the impacts of volcanic ash clouds on civil and military aviation