High ClO and ozone depletion observed in the plume of Sakurajima volcano, Japan

Details High ClO and ozone depletion observed in the plume of Sakurajima volcano, Japan High ClO and ozone depletion observed in the plume of Sakurajima volcano, Japan

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3221809l&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 21, CiteID L21809

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13

Atmospheric Composition And Structure: Volcanic Effects (8409), Atmospheric Composition And Structure: Instruments And Techniques, Atmospheric Composition And Structure: Pollution: Urban And Regional (0305, 0478, 4251), Atmospheric Composition And Structure: Troposphere: Composition And Chemistry

Scientific paper

Enhanced BrO and ClO in the boundary layer associated with ozone destruction have been observed over salt lakes, as well as in the polar boundary layer. Volcanic plumes are a major natural source of atmospheric trace gases, influencing the tropospheric and stratospheric trace gas budgets. Though a variety of volcanic gases have been investigated and BrO was found, there is still little information on other halogen oxides (e.g. ClO) in volcanic plumes and the effects on atmospheric ozone. The current belief that volcanic plumes contain ClO has not been quantified to date. Here we report the successful remote measurement of significant amounts of ClO (as well as BrO and SO2) in a volcanic plume from the Sakurajima volcano in Japan, using ground-based multi-axis differential optical absorption spectroscopy during May 2004. Additionally halogen-catalyzed local surface ozone depletion was observed in the vicinity of the volcano.

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