Abstract

The radiative properties of aerosol–soot mixtures, both internal and external, are determined in the visible and near-infrared bands by use of exact indirect mode-matching solutions to electromagnetic-wave scattering from a sphere with an eccentric spherical inclusion and from a cluster of spheres. Spherical sulfate droplets are assumed to represent aerosol particles. Soot particles are represented by volume-equivalent carbon spheres, the size distribution of which is obtained from the number distribution of the primary carbon particles that aggregate into soot grains. The mean gram-specific absorption cross section and the mean albedo of aerosol–soot mixtures are obtained by integration of the corresponding characteristics of composite sulfate–carbon particles over the size range of carbon spheres. Enhanced absorption of light by soot in aerosol–soot mixtures, a result of lensing by sulfate droplets, is highlighted by maps of the electromagnetic field in a sulfate–carbon particle.

© 2000 Optical Society of America

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