One of the main objectives of the IAVCEI-WMO Ash dispersal forecast and civil aviation workshop was to investigate the variability of existing Volcanic Ash Transport and Dispersal Models (VATDM) in order to identify new improved strategies of dispersal forecasting, e.g. probability/ensemble forecasting. In this context, a benchmark case (26 Feb. 2000 Hekla eruption, Iceland) was performed by 12 existing VATDMs to understand better the variability associated with different modelling approaches when using the same (or a very similar) input dataset.
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