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A weekly cycle in aerosol pollution and some meteorological quantities isobserved over Europe. In the present study we exploit this effect to analyseaerosol-cloud-radiation interactions. A weekly cycle is imposed onanthropogenic emissions in two general circulation models that includeparameterizations of aerosol processes and cloud microphysics. It is foundthat the simulated weekly cycles in sulfur dioxide, sulfate, and aerosoloptical depth in both models agree reasonably well with those observedindicating model skill in simulating the aerosol cycle. A distinct weeklycycle in cloud droplet number concentration is demonstrated in bothobservations and models. For other variables, such as cloud liquid waterpath, cloud cover, top-of-the-atmosphere radiation fluxes, precipitation,and surface temperature, large variability and contradictory results betweenobservations, model simulations, and model control simulations without aweekly cycle in emissions prevent us from reaching any firm conclusionsabout the potential aerosol impact on meteorology or the realism of themodelled second aerosol indirect effects

Exploiting the weekly cycle as observed over Europe to analyse aerosol indirect effects in two climate models