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Characterizing ice particles using two-dimensional reflections of a lidar beam.

M Goerke, Z Ulanowski, G Ritter

    Applied Optics
    |October 20, 2017
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    Summary

    Scientists observed brief light flashes on snow caused by ice particles reflecting lidar beams. These patterns reveal detailed information about ice particle characteristics and their altitude.

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    Area of Science:

    • Atmospheric optics
    • Glaciology
    • Remote sensing

    Background:

    • Lidar (light detection and ranging) is used to study atmospheric properties.
    • Ice particles in snow can scatter light in complex ways.

    Purpose of the Study:

    • To investigate a phenomenon of light flashes observed near a lidar beam on snow.
    • To interpret these flashes as specular reflection patterns from ice particles.
    • To determine if these patterns can provide information about ice particle properties.

    Main Methods:

    • Observing and imaging brief flashes of light on the snow surface near a lidar beam.
    • Analyzing the two-dimensional structure of the reflection patterns.
    • Correlating patterns with specific ice particle shapes and orientations.

    Main Results:

    • Observed flashes are specular reflection patterns from individual ice particles.
    • Patterns are most distinct for particles with well-defined horizontal facets (e.g., plates).
    • Identified various ice particle types (hexagonal plates, columns) and sizes in Greenland data.

    Conclusions:

    • The observed light flashes provide a novel method for characterizing ice particles.
    • Analysis of reflection patterns can determine ice particle shape, size, roughness, alignment, and altitude.
    • This technique offers new insights into snowpack composition and atmospheric conditions.