ecRad in ICON Implementation Overview

The new radiation package ecRad from ECMWF (European Centre for Medium-Range Weather Forecasts) has been successfully implemented into the numerical weather prediction (NWP) physics package of ICON. This article describes the concept of the implementation, lists assumptions that have been made and provides an overview on the available namelist settings to control ecRad. First results are presented including a comparison with the RRTM (Rapid Radiative Transfer Model) radiation scheme currently used operationally for NWP and a comparison with CERES (Clouds and the Earth’s Radiant Energy System) observational data.