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    This study introduces new empirical formulas to calculate light scattering and absorption by nonspherical particles like dust aerosols. These formulas improve atmospheric radiation budget models by accounting for edge effects in complex particle shapes.

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    Area of Science:

    • Atmospheric Science
    • Radiative Transfer
    • Computational Physics

    Background:

    • Accurate quantification of nonspherical particle effects on Earth's radiation budget is crucial.
    • Current methods like invariant imbedding T-matrix (IITM) and physical geometric optics method (PGOM) have limitations for large or complex particles.
    • Edge effect contributions to extinction and absorption efficiencies are rigorously calculable only for spheres and spheroids.

    Purpose of the Study:

    • To develop empirical formulas for edge effect contributions to extinction and absorption efficiencies for supereggs.
    • To approximate optical properties of complex atmospheric aerosols using superegg models.
    • To take a first step towards quantifying edge effects for diverse natural nonspherical particles.

    Main Methods:

    • Combining invariant imbedding T-matrix (IITM) and physical geometric optics method (PGOM) for single-scattering properties.
    • Developing empirical formulas for edge effect contributions by modifying spheroid formulas for supereggs.
    • Comparing optical properties of supereggs and simple convex particles using derived formulas.

    Main Results:

    • Novel empirical formulas for edge effect contributions in supereggs were developed.
    • The study provides a method to approximate optical properties of complex nonspherical particles.
    • This research lays the groundwork for more accurate radiative transfer calculations.

    Conclusions:

    • The developed empirical formulas offer a way to estimate edge effect contributions for superegg particles.
    • This approach serves as an initial approximation for understanding the optical properties of complex atmospheric aerosols.
    • This work is a foundational step toward accurately modeling the radiative impacts of various natural nonspherical particles.