Oxidation of volcanic SO2: A sink for stratospheric OH and H2O

Details Oxidation of volcanic SO2: A sink for stratospheric OH and H2O Oxidation of volcanic SO2: A sink for stratospheric OH and H2O

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..913b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 8, p. 913-916

Physics

27

Atmospheric Chemistry, Hydroxyl Radicals, Mesosphere, Oxidation, Stratosphere, Sulfur Dioxides, Volcanoes, Water, Aerosols, Atmospheric Models, Dehydration, Photochemical Reactions

Scientific paper

The oxidation of volcanic SO2 to sulfate in the stratosphere is investigated for an anomalously large volcanic sulfur loading (approximately 200 Mt) similar to that generated by the Tambora eruption in 1815. Model calculations suggest that stratospheric OH levels can be severely reduced by the gas-phase oxidation of SO2. One implication of this is that dense volcanic SO2 clouds may last substantially longer than previously thought. SO2 oxidation is also found to lead to significant stratospheric dehydration because approximately three molecules of H2O are consumed for each molecule of SO2 converted to sulfate. Therefore it is possible to view major volcanic eruptions as a potential sink for stratospheric H2O.

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