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
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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
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