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Two-wavelength lidar inversion algorithm for a two-component atmosphere.

J Ackermann

    Applied Optics
    |July 20, 1997
    PubMed
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    This study presents a new method for determining aerosol extinction profiles using dual-wavelength lidar data. The technique provides stable results for vertical aerosol profiles, even with imperfect lidar ratio estimates.

    Area of Science:

    • Atmospheric Science
    • Remote Sensing
    • Lidar Technology

    Background:

    • Accurate aerosol extinction profiles are crucial for understanding atmospheric processes and climate.
    • Backscatter lidar measurements are a primary tool for profiling aerosols, but require robust inversion methods.
    • Existing lidar inversion techniques face challenges with boundary-value determination and wavelength-dependent aerosol properties.

    Purpose of the Study:

    • To develop and validate a novel boundary-value method for retrieving aerosol extinction profiles from dual-wavelength lidar data.
    • To assess the method's stability and accuracy under various atmospheric conditions, including varying relative humidity and lidar ratios.
    • To improve the reliability of aerosol profiling in the planetary boundary layer.

    Main Methods:

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    • Utilizing Klett's far-end solution and Fernald's lidar equation solution for boundary-value determination.
    • Employing simultaneous inversion of lidar signals at 532 nm and 1064 nm.
    • Iteratively solving a transcendental equation based on the linear relationship between extinction coefficients at both wavelengths.
    • Applying the method to inhomogeneous model atmospheres with range-dependent lidar ratios.

    Main Results:

    • The developed method demonstrates stability and provides meaningful aerosol extinction profiles, even with misestimated lidar ratios.
    • The technique effectively accounts for aerosol growth due to increasing relative humidity in the planetary boundary layer.
    • Numerical stability allows for reliable results across a range of assumed lidar ratios (40-70 sr).

    Conclusions:

    • The proposed boundary-value method offers a robust approach for retrieving vertical aerosol extinction profiles from dual-wavelength lidar measurements.
    • The method is particularly effective for scenarios with significant aerosol loading and humidity variations.
    • Limitations include reduced utility for misestimated background radiation and very low aerosol concentrations.