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

Abstract. Volcaniceruptions comprise one of the most important airborne hazards for aviation. Although significant events are rare, they have a very high impact. The current state of tools and abilities to mitigate aviation hazards associated with an assumed volcaniccloud 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 Etna volcano in Italy. The scope of the exercise ranged from the detection of the assumed event to the issuance of early warnings. Volcanicemission concentration charts were generated applying modern ensemble techniques. The exercise products provided an important basis for decision making for aviation traffic management during a volcaniceruption crisis. By integrating the available wealth of data, observations and modelling results directly into a widely used flight planningsoftware, it was demonstrated that route optimization measures could be implemented effectively. With timely and rather precise warnings available, the new tools and processes tested during the exercise demonstrated vividly that a vast majority of flights could be conducted despite a volcanicplume widely dispersed within a high-traffic airspace over Europe. The resulting number of flight cancellations was minimal.