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Lidar effective multiple-scattering coefficients in cirrus clouds.

F O Nicolas, L R Bissonnette, P H Flamant

    Applied Optics
    |May 20, 1997
    PubMed
    Summary
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    This study identifies a specific condition for ground-based lidar observations of cirrus clouds where multiple scattering effects stabilize. It refines the lidar equation by introducing effective coefficients to account for complex scattering behaviors, improving cloud property retrieval.

    Area of Science:

    • Atmospheric Science
    • Remote Sensing
    • Cloud Physics

    Background:

    • Ground-based lidar is crucial for probing cirrus clouds.
    • Multiple scattering effects can complicate lidar signal interpretation.
    • Existing models may not fully capture complex scattering functions.

    Purpose of the Study:

    • To define a regime where field-of-view dependence of multiple scattering plateaus for lidar.
    • To formally demonstrate Platt's modification of the single-scattering lidar equation under specific assumptions.
    • To introduce effective coefficients for non-constant backscattering functions.

    Main Methods:

    • Delimitation of a specific regime for lidar probing.
    • Formal mathematical demonstration of Platt's modification.

    Related Experiment Videos

  • Introduction and discussion of an effective backscattering coefficient.

    • Main Results:

    • A plateau regime for multiple scattering field-of-view dependence was identified.
    • Platt's modification was formally demonstrated with a parameter eta(P) for forward scattering.
    • An effective backscattering coefficient was proposed for non-constant phase functions.

    Conclusions:

    • The identified regime simplifies lidar analysis for cirrus clouds.
    • The introduced effective coefficients enhance the accuracy of lidar equation modifications.
    • This work provides a more robust framework for retrieving cloud properties from lidar data.