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A method is presented to consider the influence of both soluble and insoluble aerosol particles on drop freezing in the immersion mode in cloud models. Most atmospheric aerosol particles contain soluble and insoluble materials. Thus, a more realistic description of drop freezing should account for both factors. In general, salt particles depress the freezing point according to the salt concentration, while insoluble particles raise the freezing temperature. Based on laboratory experiments, a semiempirical equation was derived to calculate the median freezing temperature as a function of the drop size and for different insoluble particles. The freezing point depression was determined using the activity coefficients of the salt solutions. The results obtained with the freezing model for drops containing soluble and insoluble particles are consistent with experimental results. An equation for the freezing rate was derived and incorporated into an adiabatic air parcel model with detailed sectional mi...

Heterogeneous Drop Freezing in the Immersion Mode: Model Calculations Considering Soluble and Insoluble Particles in the Drops