Abstract
Measurements of air and snow constituents in the vicinity of Redoubt Volcano were made during the summer of 1990 following its major eruptive cycle. Plumes from the degassing volcano were found to have an average SO 2/HCl molar ratio of 6.43 based on two observations. Snow samples were collected up to 100 km from the volcano and chemically characterized. Snow samples which contained ash deposits generally had elevated pH and conductivities and enhanced loadings of Cl −, SO 4 2−, Ca, Na, and Mg. This result is believed to be due to hydrolysis of silicate minerals and was confirmed in laboratory studies using crushed Redoubt rock samples and prepared aqueous solutions. Snow samples collected at the higher elevation sites contained higher concentrations of all constituents due to less melt water percolation through the snowpack. Some of the snow samples which contained no visible ash appear to have been influenced by the Redoubt gas emissions. These samples have decreased pH and enhanced Cl − and SO 4 2− concentrations. In these samples the molar ratio of SO 4 2−/Cl − is smaller than the SO 2 HCl ratios observed in the plume, suggesting that deposition of HCl occurs more rapidly than SO 2 removal and/or oxidation.
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