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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 18 — Jun. 20, 2003
  • pp: 3620–3633

Effect of multiple scattering on depolarization measurements with spaceborne lidars

Susanne Reichardt and Jens Reichardt  »View Author Affiliations


Applied Optics, Vol. 42, Issue 18, pp. 3620-3633 (2003)
http://dx.doi.org/10.1364/AO.42.003620


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Abstract

An analytical model based on the integration of the scattering-angle and light-path manifold has been developed to quantify the effect of multiple scattering on cirrus measurements obtained with elastic polarization lidars from space. Light scattering by molecules and by a horizontally homogeneous cloud is taken into account. Lidar parameters, including laser beam divergence, can be freely chosen. Up to 3 orders of scattering are calculated. Furthermore, an inversion technique for the retrieval of cloud extinction profiles from measurements with elastic-backscatter lidars is proposed that explicitly takes multiple scattering into account. It is found that for typical lidar system parameters such as those of the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) instrument multiple scattering does not significantly affect depolarization-ratio measurements in cirrus clouds with small to moderate optical depths. For all simulated clouds, the absolute value of the difference between measured and single-scattering volume depolarization ratio is <0.006. The particle depolarization ratio can be calculated from the measured volume depolarization ratio and the retrieved backscatter ratio without degradation of accuracy; thus characterization of the various cirrus categories in terms of the particle depolarization ratio and retrieval of cloud microphysical properties is feasible from space. The results of this study apply to polar stratospheric clouds as well.

© 2003 Optical Society of America

OCIS Codes
(280.1310) Remote sensing and sensors : Atmospheric scattering
(280.3640) Remote sensing and sensors : Lidar
(290.1090) Scattering : Aerosol and cloud effects
(290.1350) Scattering : Backscattering
(290.4210) Scattering : Multiple scattering

History
Original Manuscript: August 31, 2002
Revised Manuscript: March 4, 2003
Published: June 20, 2003

Citation
Susanne Reichardt and Jens Reichardt, "Effect of multiple scattering on depolarization measurements with spaceborne lidars," Appl. Opt. 42, 3620-3633 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-18-3620

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