Marco Buccellato, University of Bologna, Bologna, Italy; CNR Institute of Atmospheric Sciences and Climate, Bologna, Italy, Alessio Bellucci, CNR-Italy, Bologna, Italy, Susanna Corti, CNR, Institute of Atmospheric Sciences and Climate, Bologna, Italy, Giuseppe Zappa, National Research Council of Italy, Institute of Atmospheric Sciences and Climate, Bologna, Italy and Paolo Ruggieri, University of Bologna, Department of Physics and Astronomy, Bologna, Italy