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Large-Eddy Simulations (LES) are performed to examine the impact ofhygroscopic aerosols on the diurnal cycle of marine stratocumulus clouds,under varying meteorological forcing conditions. When the cloud condensationnuclei concentration increase is sufficient to inhibit drizzle formation inthe cloud layer, the precipitating and the non-precipitating cloud layersexhibit contrasting evolutions, with noticeable differences in liquid waterpath. Aerosol-induced modifications of the droplet sedimentation and drizzleprecipitation result in noticeable changes of the entrainment velocity atcloud top, but also in significant changes of the vertical stratification inthe boundary layer. This set of simulations is then used to evaluate whethera model which does not explicitly represent the effects of the interactionsoccurring within the boundary layer on its vertical stratification (i.e.such as a mixed-layer model) is capable of reproducing at least the sign, ifnot the amplitude, of these aerosol impacts on the liquid water path. It isshown that the evolution of the vertical structure is key to the responses wesimulate, and must be considered in bulk models that wish to predict theimpact of aerosol perturbations on the radiative properties ofstratocumulus-topped boundary layers

How important is the vertical structure for the representation of aerosol impacts on the diurnal cycle of marine stratocumulus?