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Applied Optics

Applied Optics


  • Vol. 43, Iss. 36 — Dec. 20, 2004
  • pp: 6620–6628

Investigating particle orientation in cirrus clouds by measuring backscattering phase matrices with lidar

Bruno V. Kaul, Ignatii V. Samokhvalov, and Sergei N. Volkov  »View Author Affiliations

Applied Optics, Vol. 43, Issue 36, pp. 6620-6628 (2004)

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The relation between the orientation of particles in ice-crystal clouds and backscattering phase matrices (BSPMs) is considered. Parameters characterizing the predominant orientation of particles in the azimuthal direction and in the horizontal position are presented. The parameters are expressed through BSPM elements. A technique for measuring BSPM elements with lidar is described. Examples of some measurements are presented along with a statistical generalization of the results from more than 400 BSPM measurements. It is found that the orientation of coarse particles with large diameters in an azimuthal direction and in a horizontal position is more probable than in a random direction. However, the orientation of large particles is often masked by small particles that are not subject to the effect of orienting factors. Thus the mean parameters characterizing the state of orientation of particles in clouds as a whole correspond to weak orientation. It is supposed that the orientation of particles in the azimuthal direction is caused by wind-velocity pulsations.

© 2004 Optical Society of America

OCIS Codes
(010.1310) Atmospheric and oceanic optics : Atmospheric scattering
(010.2940) Atmospheric and oceanic optics : Ice crystal phenomena
(280.3640) Remote sensing and sensors : Lidar
(290.1350) Scattering : Backscattering

Original Manuscript: October 10, 2003
Revised Manuscript: June 4, 2004
Manuscript Accepted: August 20, 2004
Published: December 20, 2004

Bruno V. Kaul, Ignatii V. Samokhvalov, and Sergei N. Volkov, "Investigating particle orientation in cirrus clouds by measuring backscattering phase matrices with lidar," Appl. Opt. 43, 6620-6628 (2004)

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