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Applied Optics

Applied Optics


  • Vol. 39, Iss. 36 — Dec. 20, 2000
  • pp: 6738–6745

Parry arc: a polarization lidar, ray-tracing, and aircraft case study

Kenneth Sassen and Yoshihide Takano  »View Author Affiliations

Applied Optics, Vol. 39, Issue 36, pp. 6738-6745 (2000)

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Using simple ray-tracing simulations, the cause of the rare Parry arc has been linked historically to horizontally oriented columns that display the peculiar ability to fall with a pair of prism faces closely parallel to the ground. Although we understand the aerodynamic forces that orient the long-column axis in the horizontal plane, which gives rise to the relatively common tangent arcs of the 22° halo, the mechanism leading to the Parry crystal orientation has never been resolved adequately. On 16 November 1998, at the University of Utah Facility for Atmospheric Remote Sensing, we studied a cirrus cloud producing a classic upper Parry arc using polarization lidar and an aircraft with a new high-resolution ice crystal imaging probe. Scanning lidar data, which reveal extremely high linear depolarization ratios δ a few degrees off the zenith direction, are simulated with ray-tracing theory to determine the ice crystal properties that reproduce this previously unknown behavior. It is found that a limited range of thick-plate crystal axis (length-to-diameter) ratios from ∼0.75 to 0.93 generates a maximum δ ≈ 2.0–5.0 for vertically polarized 0.532-µm light when the lidar is tilted 1°–2° off the zenith. Halo simulations based on these crystal properties also generate a Parry arc. However, although such particles are abundant in the in situ data in the height interval indicated by the lidar, one still has to invoke an aerodynamic stabilization force to produce properly oriented particles. Although we speculate on a possible mechanism, further research is needed into this new explanation for the Parry arc.

© 2000 Optical Society of America

OCIS Codes
(010.0010) Atmospheric and oceanic optics : Atmospheric and oceanic optics
(010.2940) Atmospheric and oceanic optics : Ice crystal phenomena
(010.3640) Atmospheric and oceanic optics : Lidar
(290.1350) Scattering : Backscattering

Original Manuscript: June 5, 2000
Revised Manuscript: September 25, 2000
Published: December 20, 2000

Kenneth Sassen and Yoshihide Takano, "Parry arc: a polarization lidar, ray-tracing, and aircraft case study," Appl. Opt. 39, 6738-6745 (2000)

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  1. R. A. R. Tricker, Ice Crystal Haloes (Atmospheric Optics Technical Group of the Optical Society of America, Washington, D.C., 1979), p. 30.
  2. R. Greenler, Rainbows, Halos, and Glories (Cambridge U. Press, New York, 1980).
  3. W. E. Parry, Journal of a Voyage for the Discovery of a Northwest Passage (1821), Reprint ed. (Greenwood, New York, 1968).
  4. C. S. Hastings, “A general theory of halos,” Mon. Weather Rev. 48, 322–330 (1920). [CrossRef]
  5. A. Wegener, Theorie der Haupthalos (Archiv der Duetschen Seewarte 43, Hamburg, Germany, 1926).
  6. P. Putnins, “Der bogen von Parry und andere beruhrungsbogen des gewohnlichen ringes,” Meteorol. Z. 51, 321–331 (1934).
  7. K. Sassen, “Remote sensing of planar ice crystal fall attitudes,” J. Meteorl. Soc. Jpn. 58, 422–429 (1980).
  8. K. Sassen, “Contrail-cirrus and their potential for regional climate change,” Bull. Am. Meteorl. Soc. 78, 1885–1903 (1997). [CrossRef]
  9. K. Sassen, “Lidar backscatter depolarization technique for cloud and aerosol research,” in Light Scattering by Nonspherical Particles: Theory, Measurements, and Geophysical Applications, M. L. Mischenko, J. W. Hovenier, L. D. Travis, eds. (Academic, New York, 2000), pp. 393–416. [CrossRef]
  10. S. Benson, “Lidar depolarization study to infer cirrus cloud microphysics,” M.S. thesis (University of Utah, Salt Lake City, Utah, 1999).
  11. K. Sassen, “Advances in polarization diversity lidar for cloud remote sensing,” Proc. IEEE 82, 1907–1914 (1994). [CrossRef]
  12. K. Sassen, “Cirrus clouds and haloes: a closer look,” Opt. Photon. News 10, 39–42 (1999). [CrossRef]
  13. W. Tape, Atmospheric Halos, Vol. 64 of Antarctic Research Series (American Geophysics Union, Washington, D.C., 1994). [CrossRef]
  14. Y. Takano, K. Jayaweera, “Scattering phase matrix for hexagonal ice crystals computed from ray optics,” Appl. Opt. 24, 3254–3263 (1985). [CrossRef] [PubMed]
  15. Y. Takano, K. N. Liou, “Solar radiative transfer in cirrus clouds. Part I: Single-scattering and optical properties of hexagonal ice crystals,” J. Atmos. Sci. 46, 3–19 (1989). [CrossRef]
  16. Y. Takano, K. N. Liou, “Halo phenomena modified by multiple scattering,” J. Opt. Soc. Am. A 7, 885–889 (1990). [CrossRef]
  17. R. P. Lawson, B. A. Baker, C. G. Schmitt, “Microphysics of Arctic clouds observed during FIRE/ACE,” J. Geophys. Res. (to be published).
  18. K. Sassen, N. C. Knight, Y. Takano, A. J. Heymsfield, “Effects of ice-crystal structure on halo formation: cirrus cloud experimental and ray-tracing modeling studies,” Appl. Opt. 33, 4590–4601 (1994). [CrossRef] [PubMed]
  19. K. Sassen, W. P. Arnott, J. M. Barnett, S. Aulenbach, “Can cirrus clouds produce glories?,” Appl. Opt. 37, 1427–1433 (1998). [CrossRef]
  20. W. G. Finnegan, R. C. Pitter, “Ion-induced charge separations in growing single ice crystals: effects on growth and interaction processes,” J. Colloid Interface Sci. 189, 322–327 (1997). [CrossRef]

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