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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 39, Iss. 12 — Apr. 20, 2000
  • pp: 1895–1910

Lidar Inelastic Multiple-Scattering Parameters of Cirrus Particle Ensembles Determined with Geometrical-Optics Crystal Phase Functions

Jens Reichardt, Michael Hess, and Andreas Macke  »View Author Affiliations


Applied Optics, Vol. 39, Issue 12, pp. 1895-1910 (2000)
http://dx.doi.org/10.1364/AO.39.001895


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Abstract

Multiple-scattering correction factors for cirrus particle extinction coefficients measured with Raman and high spectral resolution lidars are calculated with a radiative-transfer model. Cirrus particle-ensemble phase functions are computed from single-crystal phase functions derived in a geometrical-optics approximation. Seven crystal types are considered. In cirrus clouds with height-independent particle extinction coefficients the general pattern of the multiple-scattering parameters has a steep onset at cloud base with values of 0.5–0.7 followed by a gradual and monotonic decrease to 0.1–0.2 at cloud top. The larger the scattering particles are, the more gradual is the rate of decrease. Multiple-scattering parameters of complex crystals and of imperfect hexagonal columns and plates can be well approximated by those of projected-area equivalent ice spheres, whereas perfect hexagonal crystals show values as much as 70% higher than those of spheres. The dependencies of the multiple-scattering parameters on cirrus particle spectrum, base height, and geometric depth and on the lidar parameters laser wavelength and receiver field of view, are discussed, and a set of multiple-scattering parameter profiles for the correction of extinction measurements in homogeneous cirrus is provided.

© 2000 Optical Society of America

OCIS Codes
(010.1290) Atmospheric and oceanic optics : Atmospheric optics
(010.3640) Atmospheric and oceanic optics : Lidar
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(290.1090) Scattering : Aerosol and cloud effects
(290.1350) Scattering : Backscattering
(290.4210) Scattering : Multiple scattering
(290.5860) Scattering : Scattering, Raman

Citation
Jens Reichardt, Michael Hess, and Andreas Macke, "Lidar Inelastic Multiple-Scattering Parameters of Cirrus Particle Ensembles Determined with Geometrical-Optics Crystal Phase Functions," Appl. Opt. 39, 1895-1910 (2000)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-39-12-1895

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