Chlorophyll fluorescence data collected on Mount Etna, Sicily, 2017 - Walter, G.M.; Clark, J.; Cristaudo, A.E.; Terranova, D.; Nevado, B.; Catara, S.; Paunov, M.; Velikova, V.; Filatov, D.; Cozzolino, S.; Hiscock, S.; Bridle, J. (NERC EDS Environmental Information Data Centre, 2022)