Measurements of OH, H2SO4, and MSA at the South Pole during ISCAT

Details Measurements of OH, H2SO4, and MSA at the South Pole during ISCAT Measurements of OH, H2SO4, and MSA at the South Pole during ISCAT

Oct 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.3629m&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 19, p. 3629-3632

Physics

22

Atmospheric Composition And Structure, Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry

Scientific paper

The first measurements of OH, H2SO4, and MSA performed at the South Pole as part of the Investigation of Sulfur Chemistry in the Antarctic Troposphere (ISCAT) study are presented. OH concentrations were found to be quite elevated for such a dry environment, with average values of 2×106 molecule cm-3. Model simulations suggest that much of the observed OH is a result of unexpectedly high NO concentrations. Concentrations of H2SO4 and MSA were generally low with average values of 2.5×105 and 1×105 molecule cm-3, respectively. Major variations in the concentration levels of the above species were found to have a high correlation with changes in the polar mixing layer as estimated from the measured temperature difference from 22 to 2 m above the snow surface. Chemical details are discussed.

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