Gaseous sulfuric acid and sulfur dioxide measurements in the Arctic troposphere and lower stratosphere - Implications for hydroxyl radical abundances

Details Gaseous sulfuric acid and sulfur dioxide measurements in the Arctic troposphere and lower stratosphere - Implications for hydroxyl radical abundances Gaseous sulfuric acid and sulfur dioxide measurements in the Arctic troposphere and lower stratosphere - Implications for hydroxyl radical abundances

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1763m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 17, Sept. 4, 1992, p. 1763-1766. Research supported by BMFT.

Physics

29

Arctic Regions, Hydroxyl Radicals, Stratosphere, Sulfur Dioxides, Sulfuric Acid, Troposphere, Abundance, Airborne Equipment, Atmospheric Chemistry, Atmospheric Composition, Mass Spectroscopy, Trace Contaminants

Scientific paper

Measurements of gaseous sulfuric acid and sulfur dioxide were made in the winter Arctic troposphere and lower stratosphere using aircraft-borne mass spectrometers. The measurements, covering altitudes between 3.5 and 11.4 km, took place on 14 and 18 February, 1987 in northern Scandinavia. The abundance of H2SO4 was around 0.01 to 0.06 pptv (parts per trillion by volume), and the measured SO2 volume mixing ratios are around 50 to 400 pptv in the troposphere and decrease steeply above the tropopause to about 10 pptv. This decrease above the tropopause is in contrast to previous measurements showing constant or even increasing SO2 mixing ratios. The combined H2SO4 and SO2 measurements offer an interesting opportunity to infer hydroxyl radical concentrations. Inferred OH concentrations are around 0.1-1.0 x 10 exp 5/cu cm being roughly consistent with model predictions for winter time high latitudes.

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