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Composition and Distribution Analysis of Bioaerosols Under Different Environmental Conditions
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Improved algorithm of aerosol particle size distribution based on remote sensing data.

Qing Yan, Huige Di, Jing Zhao

    Applied Optics
    |November 2, 2019
    PubMed
    Summary

    This study introduces an improved algorithm for retrieving aerosol particle size distribution (APSD) and aerosol microphysical parameters (AMPs) using only multi-wavelength extinction data. The method enhances stability and broadens the radius range for accurate aerosol characterization.

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    Area of Science:

    • Atmospheric Science
    • Optical Physics
    • Aerosol Science

    Background:

    • Aerosol particle size distribution (APSD) retrieval is crucial for atmospheric studies.
    • Existing methods often require complex assumptions or extensive data.

    Purpose of the Study:

    • To develop and validate an improved algorithm for APSD and aerosol microphysical parameter (AMP) retrieval.
    • To utilize only multi-wavelength extinction coefficients for enhanced accuracy and stability.
    • To broaden the applicable radius range for APSD inversion.

    Main Methods:

    • Combined regularization algorithm with prior values for APSD and AMP retrieval.
    • Employed minimum discrepancy principle and averaging procedures for stable fine-mode APSD inversion.
    • Utilized lognormal distribution fitting with prior values for coarse-mode APSD reconstruction.

    Main Results:

    • The algorithm demonstrates improved stability and a wider inversion radius range for APSD.
    • Reliable inversion of APSD and AMPs was achieved without assuming complex refractive index.
    • Validation with typical and measured APSD data confirmed the algorithm's reliability.

    Conclusions:

    • The developed algorithm offers a robust and stable method for retrieving APSD and AMPs.
    • This approach simplifies aerosol characterization by relying solely on extinction data.
    • The method is effective across a broad range of aerosol types and conditions.