1. Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, 15236 Athens, Greece
2. Department of Physics, Section of Environmental Physics-Meteorology, National and Kapodistrian University of Athens, 15772 Athens, Greece
3. Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
4. Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, 10129 Turin, Italy
5. School of Marine and Atmospheric Sciences, Stony Brook University, New York, NY 11790, USA