Reduction of Multiple Scattering to Second Order Scattering for Determination of Liquid-Cloud Microphysical Properties

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Authors
  1. Cao, X.
  2. Roy, G.
  3. Tremblay, G.
Corporate Authors
Defence Research and Development Canada, Valcartier Research Centre, Quebec QC (CAN);Lidar Consultant, Ottawa ON (CAN);AEREX Avionics Inc, Breakeyville QUE (CAN)
Abstract
Under single scattering conditions, water droplets clouds do not depolarize the backscattered light. However, backscattered light from multiple scattering will be depolarized. The level of depolarization is a function of the droplets size and of the cloud extinction coefficient value and its profile; it has also a strong dependency on the lidar field-of-view (FOV) and azimuth angle [1]- [3]. It has been demonstrated in [4] that the multiple scattering cross polarization signal can be reduced to a second order scattering one using the azimuthal dependency of the cross polarization. In this paper we present how the multiple scattering cross polarization can be reduced to a second order scattering and how this signal is related to the droplet particle size. Monte Carlo simulations for clouds at different ranges and effective radius sizes are performed and compared with the results obtained with an analytical model.
Keywords
Lidar;polarization;Multiple scattering
Report Number
DRDC-RDDC-2018-N006 — External Literature
Date of publication
01 Feb 2018
Number of Pages
8
DSTKIM No
CA045735
CANDIS No
806183
Format(s):
Electronic Document(PDF)

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