H2SO4 photolysis: A source of sulfur dioxide in the upper stratosphere

Details H2SO4 photolysis: A source of sulfur dioxide in the upper stratosphere H2SO4 photolysis: A source of sulfur dioxide in the upper stratosphere

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22.1109r&link_type=abstract

Geophysical Research Letters, Volume 22, Issue 9, p. 1109-1112

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Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Atmospheric Composition And Structure: Transmission And Scattering Of Radiation, Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Volcanic Effects

Scientific paper

Numerous absorption lines of stratospheric sulfur dioxide (SO2) have been identified in solar occultation spectra recorded by the Atmospheric Trace Molecule Spectroscopy (ATMOS) Fourier transform spectrometer during the Atmospheric Laboratory for Applications and Science (ATLAS)-1 shuttle mission (March 24-April 2, 1992). Based on their analysis, a volume mixing ratio profile of SO2 increasing from (13+/-4) p.p.t.v. (parts per 10-12 by volume) at 16 mbar (~28 km) to 455+/-90 p.p.t.v. at 0.63 mbar (~52 km) has been measured with no significant profile differences between 20°N and 60°S latitude. The increase in the SO2 mixing ratios with altitude indicates the presence of a source of SO2 in the upper stratosphere. Profiles retrieved from ATMOS spectra recorded during shuttle flights in April-May 1985 and April 1993 show similar vertical distributions but lower concentrations. Two-dimensional model calculations with SO2 assumed as the end product of H2SO4 photolysis produce SO2 profiles consistent with the ATMOS measurements to within about a factor of 2.

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