Ground-based UV-VIS spectroscopy - Diurnal OClO-profiles during January 1990 above Sondre Stromfjord, Greenland

Details Ground-based UV-VIS spectroscopy - Diurnal OClO-profiles during January 1990 above Sondre Stromfjord, Greenland Ground-based UV-VIS spectroscopy - Diurnal OClO-profiles during January 1990 above Sondre Stromfjord, Greenland

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..787p&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, April 1991, p. 787-790.

Physics

10

Atmospheric Chemistry, Chlorine Oxides, Ozone Depletion, Stratosphere, Ultraviolet Spectroscopy, Visible Spectrum, Atmospheric Composition, Diurnal Variations, Greenland

Scientific paper

Considerable amounts of chlorine dioxide, OClO, were observed from January 5 through February 2, 1990 in the stratosphere above Sondre Stromfjord showing a highly perturbed chlorine chemistry. Photolysis and simultaneous formation of the OClO leads to a typical concentration minimum at noon. Its changes in concentration indicate the release of the OClO precursors BrO and ClO from their respective reservoir substances in the morning. Two incidences of increased OClO production occur repeatedly at 92 deg and 89 deg solar zenith angle (SZA). Furthermore, in the beginning of January OClO morning values exceed those found at dusk for comparable SZA whereas toward the end of the month the morning values become depressed compared to the evening. The twilight vertical column densities of OClO often reach about 1.6 x 10 to the 13th molec cu cm and a comparison shows an increase from 1988 to 1990.

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