Figure 5.1: Extinction
efficiency (per unit total aerosol mass) and single scattering albedo of aerosols.
The calculations are integrated over a typical solar spectrum rather than using
a single wavelength.
Aerosols with diameters between about 0.1 and 2 µm scatter the most light
per unit mass. Coarse mode aerosols (i.e., those larger than accumulation mode)
have a smaller single scattering albedo even if they are made of the same material
(i.e., refractive index) as accumula-tion mode aerosols. If the refractive index
1.37 0.001i is viewed as that of a hydrated aerosol then the curve represents
the wet extinction efficiency. The dry extinction efficiency would be larger and
shifted to slightly smaller diameters.