@inproceedings{3188569, title = "MONITORING ICE CRYSTALS CLOUDS: INVESTIGATION OF THE LIDAR DEPOLARIZATION RATIOS", author = "Voudouri, Kalliopi-Artemis and Giannakaki, Elina and Komppula, Mika and and Gialitaki, Anna and Natsis, Athanasios and Balis, Dimitris", year = "2020", publisher = "E D P SCIENCES", booktitle = "29TH INTERNATIONAL LASER RADAR CONFERENCE (ILRC 29)", doi = "10.1051/epjconf/202023708013", abstract = "A cirrus cloud dataset from a groundbased lidar in a sub-arctic station is analyzed in terms of the particle depolarization ratio. The depolarization values -delta- showed a broad distribution, ranging between 0.25 and 0.7, with a mean value of 0.38 +/- 0.07. This variability is examined in correlation with temperature dependencies and the cirrus optical depth. Depolarization values greater than 0.45 are observed from temperatures between -60 degrees C and -40 degrees C, where horizontally oriented planar ice crystals are to be expected. Two case studies are also, discussed and analyzed in terms of depolarization height dependence." }