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January 1, 1989Journal of the Atmospheric Sciences

Solar Radiative Transfer in Cirrus Clouds. Part I: Single-Scattering and Optical Properties of Hexagonal Ice Crystals

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Authors

YTY. TakanoUniversity of California, Los AngelesKLKuo‐Nan LiouUniversity of California, Los Angeles

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Implication

Computational modeling study characterizes optical scattering of hexagonal ice crystals in cirrus clouds, indicating that particle shape significantly alters solar radiation and polarization.

Key Points

  • To develop an improved ray-tracing program that accounts for birefringence and forward transmission to accurately model solar light scattering by hexagonal ice crystals in cirrus clouds.
  • Formulated an enhanced ray-tracing approach incorporating geometric forward transmission and ice birefringence for randomly and horizontally oriented hexagonal columns and plates.
  • Calculated scattering phase matrices, extinction cross sections, single-scattering albedos, and asymmetry factors across five solar wavelengths using particle size distributions observed in four cirrus cloud regimes.
  • Assuming equivalent-surface-area spheres yielded larger asymmetry factors across all wavelengths and lower single-scattering albedos in near-infrared wavelengths compared to hexagonal crystals.
  • Computed scattering phase matrix elements matched laboratory ice cloud measurements and accurately reproduced the angular positions and relative intensities of atmospheric halos and arcs.
  • Identified that the neutral point angle of zero linear polarization shifts markedly with ice crystal shape, demonstrating a satellite-based optical signature to infer particle aspect ratio.

Cite This Study

Takano et al. (1989) studied this question.

synapsesocial.com/papers/6a1cb2d95a7763abe7899f84https://doi.org/10.1175/1520-0469(1989)046<0003:srticc>2.0.co;2
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