This thesis aims to quantify the direct radiative effects of sea salt aerosol in the
atmosphere. The online coupled regional scale model system COSMO-ART is extended for this
objective with respect to the sea salt aerosol. Furthermore a new sea salt optical
parameterisation is developed for both the shortwave and longwave spectrum. Based on numerical
simulations with the extended model system the direct radiative effects of sea salt aerosol
are investigated.
