Experimental measurements of the heterogeneous reactivity of sulfuric acid‐water mixtures at low temperatures are presented. The kinetic data are combined with a stratospheric aerosol‐loading model and simple chemical models to predict the effect of heterogeneous chlorine and chlorine oxide radical reactions on the stratospheric Cl/HCl ratio at several altitudes. The Cl reactions are found to have little influence, but the ClO reaction reduces the Cl/HCl ratio by about 3% at 20 km (within a factor of 2 at 1 standard deviation). The effect at higher altitudes is smaller. Simulated sunlight was found to have no effect on the heterogeneous reactivities.
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Martin et al. (1980) studied this question.
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