Laboratory of Atmospheric Physics, Physics Department, Aristotle University of Thessaloniki, P.O. Box 149, GR-54124 Thessaloniki, Greece

Max Planck Institute for Chemistry, Biogeochemistry Department, P.O. Box 3060, D-55020 Mainz, Germany

Max Planck Institute for Chemistry, Biogeochemistry Department, P.O. Box 3060, D-55020 Mainz, Germany

Laboratory of Atmospheric Physics, Physics Department, Aristotle University of Thessaloniki, P.O. Box 149, GR-54124 Thessaloniki, Greece

Max Planck Institute for Chemistry, Biogeochemistry Department, P.O. Box 3060, D-55020 Mainz, Germany

Laboratory of Atmospheric Physics, Physics Department, Aristotle University of Thessaloniki, P.O. Box 149, GR-54124 Thessaloniki, Greece

Centre of Geophysics of Évora, Universidade de Évora, Rua R. Ramalho, 59, P-7000-532 Evora, Portugal

Max Planck Institute for Chemistry, Biogeochemistry Department, P.O. Box 3060, D-55020 Mainz, Germany

Laboratory of Atmospheric Physics, Physics Department, Aristotle University of Thessaloniki, P.O. Box 149, GR-54124 Thessaloniki, Greece

Nuclear Physics Department, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece