Retrieving "Extinction Optical Depth" from the archives

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1. Aerosol

   Linked via "extinction optical depth"

   $$ \tau{ext}(\lambda) \propto \sumi Ni \sigma{scat, i}(\lambda) $$
   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