Multiple scattering of light in clouds is both important and complex. It is necessary to deal with time-varying diffuse light fields in the presence of anisotropic scattering and polarization, the coupling of radiation with heat and moisture transfer, and other complicating aspects. For the sake of simplicity, this paper views the radiative transfer problem in clouds as that of multiple scattering with an anisotropic phase function, leaving out heat transfer and other effects. Anisotropic scattering processes also take place in lakes and oceans and in glacial ice.
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