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- W2046940863 abstract "This paper presents a mathematical model that describes the chemical composition and growth rate of atmospheric aerosols containing sulfate and nitrate, and that is applicable over the entire range of relative humidities. The model describes aerosols as consisting of an insoluble core, a soluble solid shell and an aqueous film. The chemical composition of the solid and aqueous aerosol phases in this model is governed by the following processes: (1) the chemical equilibria between the ambient gas and the aerosol liquid phases and between the aerosol liquid and the soluble solid phases; (2) the diffusion-limited condensation of H2SO4 and (3) the liquid-phase chemical reaction of SO2. At low humidities the liquid phase may not be thermodynamically viable, in which case the model then treats the solid-phase/gas-phase equilibrium. Model simulations were conducted to study the effect of ambient relative humidity and gas-phase concentrations on the aerosol chemical composition and growth rate. Results indicate that (1) precipitation of (NH4)2SO4 occurs at its point of deliquescence (i.e. at a relative humidity of close to 80%) even in the presence of other electrolytes; (2) within the uncertainty of the thermodynamic data, the saturation products of NH3 and HNO3 for a liquid-coated aerosol and a dry aerosol are in agreement with each other; (3) the aerosol concentrations correspond closely to (NH4) 2SO4 and NH4NO3 for both liquid and solid phases, i.e. NH4HSO4 is predicted to exist in negligible amounts under most conditions and (4) the assumption of either an ideal internal mixture or an external mixture for dry sulfates and nitrate aerosols has little effect on model predictions." @default.
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- W2046940863 date "1983-01-01" @default.
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- W2046940863 title "Modeling of multiphase atmospheric aerosols" @default.
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- W2046940863 doi "https://doi.org/10.1016/0004-6981(83)90406-7" @default.
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