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Three configurations of a bulk microphysics scheme in conjunction with adetailed bin scheme are implemented in the Weather Research and Forecasting(WRF) model to specifically address the role of the saturation adjustmentassumption (i.e., condensing/evaporating the surplus/deficit water vaporrelative to saturation in one time step) on aerosol-induced invigoration ofdeep convective clouds. The bulk model configurations are designed to treatcloud droplet condensation/evaporation using either saturation adjustment, asemployed in most bulk models, or an explicit representation ofsupersaturation over a time step, as used in bin models. Results demonstratethat the use of saturation adjustment artificially enhances condensation andlatent heating at low levels and limits the potential for an increase inaerosol concentration to increase buoyancy at mid to upper levels. This leadsto a small weakening of the time- and domain-averaged convective mass flux(~-3%) in polluted compared to clean conditions. In contrast, the binmodel and bulk scheme with explicit prediction of supersaturation simulate anincrease in latent heating aloft and the convective updraft mass flux isweakly invigorated (~5%). The bin model also produces a largeincrease in domain-mean cumulative surface precipitation in pollutedconditions (~18%), while all of the bulk model configurationssimulate little change in precipitation. Finally, it is shown that the coldpool weakens substantially with increased aerosol loading when saturationadjustment is applied, which acts to reduce the low-level convergence andweaken the convective dynamics. With an explicit treatment of supersaturationin the bulk and bin models there is little change in cold pool strength, sothat the convective response to polluted conditions is influenced more bychanges in latent heating aloft. It is concluded that the use of saturationadjustment can explain differences in the response of cold pool evolution andconvective dynamics with aerosol loading simulated by the bulk and binmodels, but cannot explain large differences in the response of surfaceprecipitation between these models

Are simulated aerosol-induced effects on deep convective clouds strongly dependent on saturation adjustment?