Investigations into the impact of the lower boundary condition on thereflected solar radiance field

Kurzfassung

It is presented how the original isotropic boundary condition in a Gauss-Seidel radiative transfer model is generalized to describe an angular dependent surface reflection. A symmetry about the plane of incidence is assumed since the general case of an arbitrary non-symmetric reflection is to costly. As a result using Hapke's BRDF the upward radiance at the surface and the top of the atmosphere are discussed and compared to the results with the original isotropic boundary condition. In addition we discuss the impact of Rayleigh scattering and aerosol extinction on the reflected solar radiance field.