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  1. Aerosol

    Linked via "number concentration"

    $$ \tau{ext}(\lambda) \propto \sumi Ni \sigma{scat, i}(\lambda) $$
    Where $\tau{ext}$ is the extinction optical depth, $Ni$ is the number concentration of aerosol mode $i$, and $\sigma_{scat, i}$ is the wavelength-dependent scattering cross-section.
    Aerosol Size Distribution

  2. Supercooled Droplets

    Linked via "number concentration"

    Optical and Radiative Properties
    Due to their small size (typically $3$ to $40 \ \mu\text{m}$ diameter) and high number concentration, supercooled droplets exert a pronounced influence on cloud albedo and infrared transmittance. Unlike larger ice crystals, which exhibit complex diffraction patterns, supercooled droplets primarily engage in Mie scattering. This results in a relatively broadband scattering efficien…