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Circular Depolarization Ratios of Single Water Droplets and Finite Ice Circular Cylinders: a Modeling Study : Volume 11, Issue 11 (08/11/2011)

By Nicolet, M.

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Book Id: WPLBN0003995740
Format Type: PDF Article :
File Size: Pages 20
Reproduction Date: 2015

Title: Circular Depolarization Ratios of Single Water Droplets and Finite Ice Circular Cylinders: a Modeling Study : Volume 11, Issue 11 (08/11/2011)  
Author: Nicolet, M.
Volume: Vol. 11, Issue 11
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2011
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Schnaiter, M., Stetzer, O., & Nicolet, M. (2011). Circular Depolarization Ratios of Single Water Droplets and Finite Ice Circular Cylinders: a Modeling Study : Volume 11, Issue 11 (08/11/2011). Retrieved from http://kindle.worldlibrary.net/


Description
Description: Institute for Atmospheric and Climate Science, ETH Zurich, 8092, Zurich, Switzerland. Computations of the phase matrix elements for single water droplets and ice crystals in fixed orientations are presented to determine if circular depolarization Δ±C is more accurate than linear depolarization for phase discrimination. T-matrix simulations were performed to calculate right-handed and left-handed circular depolarization ratios Δ+C, respectively Δ−C and to compare them with linear ones. Ice crystals are assumed to have a circular cylindrical shape where their surface-equivalent diameters range up to 5 μm. The circular depolarization ratios of ice particles were generally higher than linear depolarization and depended mostly on the particle orientation as well as their sizes. The fraction of non-detectable ice crystals (Δ < 0.05) was smaller considering a circular polarized light source, reaching 4.5%. However, water droplets also depolarized light circularly for scattering angles smaller than 179° and size parameters smaller than 6 at side- and backscattering regions. Differentiation between ice crystals and water droplets might be difficult for experiments performing at backscattering angles which deviate from 180° unlike lidar applications. If the absence of the liquid phase is confirmed, the use of circular depolarization in single particle detection is more sensitive and less affected by particle orientation.

Summary
Circular depolarization ratios of single water droplets and finite ice circular cylinders: a modeling study

Excerpt
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