Extinction and Forward Scattering in a Settling Aerosol

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Abstract
The optical depth of a settling aerosol is measured as a function of time. An analytic model is fitted to the time record of the optical depth. This allows an inversion of the problem which results in an analytic model for the size distribution of aerosol particles for radii between 1 μ and 10 μ. The model size distribution is verified by comparison with data from a direct microscope count of particle sizes. The model size distribution is then used to calculate the time behavior of forward scattered light. This calculation is compared to experiment to provide further corroboration of the aerosol size distribution.