Extension of the WRF-Chem volcanic emission preprocessor to integrate complex source terms and evaluation for different emission scenarios of the Grimsvötn 2011 eruption - Hirtl, M.; Scherllin-Pirscher, B.; Stuefer, M.; Arnold, D.; Baro, R.; Maurer, C.; Mulder, M. D. (Nat. Hazards Earth Syst. Sci., 2020)