Physicochemical or geochemical

• Allen, A. G., Mather, T. A., McGonigle, A. J. S., Aiuppa, A., Delmelle, P., Davison, B., Bobrowski, N., Oppenheimer, C., Pyle, D. M., Inguaggiato, S., (2006), Sources, size distribution, and downwind grounding of aerosols from Mount Etna, Journal of Geophysical Research-Atmospheres, 111(D10302), 10.1029/2005JD006015