Radiation budget is a key parameter of the Earth’s climate system. Its components can be altered by anthropogenic and natural processes resulting in climate changes. This problem will be the focal point of the session. We invite papers on observation and modeling of the Earth and Surface Radiation budget as well as its variability in space and time. We welcome papers which can improve our understanding and quantitative characterization of the radiative forcing by solar irradiance, atmospheric species, clouds and aerosol. The papers based on the comparison of the simulated radiation budget with observation data are encouraged. Special attention will be paid to the following key issues: the results of recent satellite experiments CERES and GERB; cloud, surface albedo and direct/indirect aerosol radiative forcing; uncertainties in the anthropogenic and natural forcing; validation of the Earth/Surface radiation budget retrieved from the data acquired by ground- based/satellite instruments as well as from climate simulations and reanalyses; and energy budget/water cycle interactions.