OXIDATION OF VOLCANIC SO2 - A SINK FOR STRATOSPHERIC OH AND H2O

被引:97
作者
BEKKI, S
机构
[1] Centre for Atmospheric Science, Department of Chemistry, University of Cambridge, Cambridge
关键词
D O I
10.1029/95GL00534
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The oxidation of volcanic SO2 to sulphate in the stratosphere is investigated for an anomalously large volcanic sulphur loading (similar to 200 Mt) similar to that generated by the Tambora eruption in 1815. Model calculations suggest that stratospheric OH levels call 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 sulphate. Therefore it is possible to view major volcanic eruptions as a potential sink for stratospheric H2O.
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页码:913 / 916
页数:4
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