Abstract
A theoretical model describing the general interaction between atmospheric trace gases, such as S02, NH3, C02 and 02, chemical reactant gaseous product H2SO4 and hydrometeors containing NaCl is proposed to study a possible mechanism for HCl production in non-precipitating cloud and the determination of the pH value of cloud droplets.
Four different cloud droplet distributions have been used to estimate the upper limit of the amount of gaseous HCl released into the atmosphere resulting from the evaporation of cloud droplets. It is shown that the acid production and the amount of HCl released depend on the following factors: (a) the temperature of the cloud; (b) the oxidation rates; (c) the ambient concentration of SO2, NH3, and H2SO4; (d) the life cycle of the cloud; and (e) the liquid content of the cloud.
This proposed chemical model also predicts a pH value spectrum depending on the cloud droplet distribution. Field measurements for the dependence of pH value on particle size and spatial distribution of gaseous HCl are recommended.
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The National Center for Atmospheric Research is sponsored by the National Science Foundation.
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Yue, G.K., Mohnen, V.A. & Kiang, C.S. A mechanism for hydrochloric acid production in cloud. Water, Air, and Soil Pollution 6, 277–294 (1976). https://doi.org/10.1007/BF00182870
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DOI: https://doi.org/10.1007/BF00182870