https://doi.org/10.1051/epjconf/202023708013
Monitoring Ice Crystals Clouds: Investigation of the Lidar Depolarization Ratios
1 Laboratory of Atmospheric Physics, Physics Department, Aristotle University of Thessaloniki, Greece
3 Finnish Meteorological Institute, P.O.Box 1627, FI-70211, Kuopio, Finland
4 Department of Environmental Physics and Meteorology, Faculty of Physics, University of Athens, Greece
5 National Observatory of Athens, NOA, Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, Greece
* Email: kavoudou@physics.auth.gr
Published online: 7 July 2020
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 -δ- 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 -60oC and -40oC, where horizontally oriented planar ice crystals are to be expected. Two case studies are also, discussed and analyzed in terms of depolarization height dependence.
© The Authors, published by EDP Sciences, 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
