MONITORING ICE CRYSTALS CLOUDS: INVESTIGATION OF THE LIDAR DEPOLARIZATION RATIOS

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 correlat...

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Bibliographic Details
Main Authors: Voudouri, Kalliopi-Artemis, Giannakaki, Elina, Komppula, Mika and, Gialitaki, Anna, Natsis, Athanasios, Balis, Dimitris
Format: Conference Object
Language:English
Published: E D P SCIENCES 2020
Subjects:
Arctic
Online Access:https://pergamos.lib.uoa.gr/uoa/dl/object/uoadl:3188569
Description
Summary: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.

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