Aerosols in the tropical and subtropical UT/LS: in-situ measurements of submicron particle abundance and volatility - Borrmann, S.; Kunkel, D.; Weigel, R.; Minikin, A.; Deshler, T.; Wilson, J. C.; Curtius, J.; Volk, C. M.; Homan, C. D.; Ulanovsky, A.; Ravegnani, F.; Viciani, S.; et al. (Atmos. Chem. Phys., 2010)