The role of clouds and of neutral as well as ion induced pathway for the new particle formation in the tropical upper troposphere: In-situ measurements from continental South America and West Africa.

Borrmann, S.; Weigel, R.; Kazil, J.; Minikin, A.; Stohl, A.; Wilson, J.C.; Kunkel, D.; de Reus, M.; Frey, W.; Lovejoy, E.R.; the C. Michael Volk, Silvia Viciani, Francesco Cairo, Kathy S. Law, Joachim Curtius Team.