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 -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 wi...

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Bibliographic Details
Published in:EPJ Web of Conferences
Main Authors: Voudouri Kalliopi – Artemis, Giannakaki Elina, Komppula Mika, Gialitaki Anna, Natsis Athanasios, Balis Dimitris
Format: Article in Journal/Newspaper
Language:English
Published: EDP Sciences 2020
Subjects:
Physics
QC1-999
Arctic
Online Access:https://doi.org/10.1051/epjconf/202023708013
https://doaj.org/article/f950bd513aa84095a530f22f27e87ee0
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 -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.

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