Relationship between solar net radiative fluxes at the top of the atmosphere and at the surface

Abstract

The model results indicate a somewhat complex relation between the solar net fluxes at the surface and at the top of the atmosphere. Cloud altitude and optical depth have a large impact on solar atmospheric absorption: high clouds decrease solar absorption by the atmosphere whereas low clouds increase it. This difference between solar atmospheric absorption for low and high clouds increases with cloud optical depth. Changes of total atmospheric absorption with cloud-top height are nearly completely compensated by corresponding changes in the net flux at the top of the atmosphere, thus leaving the surface solar net flux constant. Furthermore, this paper provides a very simple parameterization for estimating the clear-sky solar atmospheric absorption as a function of solar zenith angle and the vertically integrated water vapor content of the atmosphere. -from Author