Monitoring Ice Crystals Clouds: Investigation of the Lidar Depolarization Ratios Kalliopi – Artemis Voudouri, Elina Giannakaki, Mika Komppula, Anna Gialitaki, Athanasios Natsis and Dimitris Balis EPJ Web Conf., 237 (2020) 08013 Published online: 07 July 2020 DOI: 10.1051/epjconf/202023708013