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Related Experiment Videos

Laser transmission-backscattering through inhomogeneous cirrus clouds.

Szu-Cheng Ou1, Yoshihide Takano, Kuo-Nan Liou

  • 1Department of Atmospheric Sciences, University of California, Los Angeles 90095-1565, USA. ssou@atmos.ucla.edu

Applied Optics
|September 25, 2002
PubMed
Summary

A new 2D model simulates high-energy laser beam interactions with inhomogeneous cirrus clouds. This model integrates satellite data and ice-crystal measurements to analyze laser transmission and backscattering in realistic atmospheric conditions.

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Area of Science:

  • Atmospheric Physics
  • Remote Sensing
  • Laser Physics

Background:

  • Cirrus clouds significantly impact atmospheric radiative transfer and remote sensing.
  • Accurate modeling of laser beam propagation through clouds is crucial for applications like lidar and laser communication.

Purpose of the Study:

  • To develop and validate a two-dimensional (2D) model for analyzing high-energy laser beam transmission and backscattering in inhomogeneous cirrus clouds.
  • To integrate satellite remote sensing data with in-situ measurements for improved cirrus cloud characterization within the model.

Main Methods:

  • Developed a 2D model applicable to both plane-parallel and spherical geometries.
  • Combined Advanced Very High Resolution Radiometer (AVHRR) satellite data with vertical profiling of ice-crystal size distributions.

Related Experiment Videos

  • Incorporated satellite-derived cirrus cloud position and composition into the laser propagation model.

    • Main Results:

    • Analyzed laser direct transmission, forward scattering, and backscattering based on aircraft height, optical depth, and ice-crystal properties.
    • Found negligible uncertainty in laser transmission due to ice-crystal size errors.
    • Quantified a ~2% uncertainty in transmission from +/-0.05 errors in retrieved optical depth.
    • Observed decreased direct transmission when the laser propagates through the curved cloud top, especially with increased horizontal distance.

    Conclusions:

    • The developed 2D model effectively simulates laser beam interactions with realistic cirrus clouds.
    • Satellite remote sensing is a valuable tool for characterizing cirrus clouds for laser propagation modeling.
    • Accurate retrieval of cirrus cloud optical depth is critical for precise laser transmission predictions.