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Simple relation between lidar multiple scattering and depolarization for water clouds.

Yongxiang Hu1, Zhaoyan Liu, David Winker

  • 1Climate Science Branch, NASA Langley Research Center, Hampton, Virginia 23681, USA. yongxiang.hu-1@nasa.gov

Optics Letters
|May 27, 2006
PubMed
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A new relationship between multiple scattering and linear depolarization ratio in water clouds was found using lidar. This helps accurately assess signal changes from multiple scattering in clouds for space-based lidar measurements.

Area of Science:

  • Atmospheric Science
  • Remote Sensing
  • Cloud Physics

Background:

  • Backscatter lidar measurements are crucial for characterizing cloud properties.
  • Multiple scattering effects can perturb lidar signals, complicating cloud analysis.
  • Linear depolarization ratio is a key parameter derived from lidar returns.

Purpose of the Study:

  • To derive an empirical relationship between multiple-scattering fraction and linear depolarization ratio.
  • To validate this relationship across diverse cloud conditions and lidar configurations.
  • To enable accurate assessment of multiple scattering impacts on space-based lidar data.

Main Methods:

  • Monte Carlo simulations of water clouds were performed.
  • Simulations considered variations in extinction coefficients, droplet sizes, and distributions.

Related Experiment Videos

  • Multiple-field-of-view lidar measurements were used for verification.

    • Main Results:

    • An empirical relationship between multiple-scattering fraction and linear depolarization ratio was established.
    • This relationship holds for a wide range of cloud properties and instrument parameters.
    • The findings were validated using independent lidar measurements.

    Conclusions:

    • The derived relationship provides a robust method for quantifying multiple scattering in water clouds.
    • It is applicable to various cloud types and lidar measurement scenarios.
    • This enables more accurate signal interpretation for space-based lidar missions.