Fig. 3. Calculated extinction coefficients for International Code 2 (Rm = 0.5 km) and Code 6 (Rm = 10 km) fogs. with the fact that the explicit details of the size distributions have less influence on /3n (21,22). As the water content increases, accompanied by a decrease in visibility, the minimum in /3ex near 11 pun disappears and the extinction coefficient is nearly flat with wavelength. Clouds. Using the Mie scattering code hsphr, /3„, /3SC, and and the forward and backward angular scattering coefficients, k{ and kb, were calculated for representative middle- and low-level cloud types. Two particle compositions were modelled: [1] homogeneous particle polydispersions of pure water and [2] heterogeneous particle polydispersions consisting of nuclei of fixed radius surrounded concentrically by liquid water. Hence, the thickness of the liquid water shell varies according to the particle size distribution while the diameter of the nuclei remain constant. Nuclei
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