Ground-based UV-Vis spectroscopy: Diurnal OClO-profiles during January 1990 above Soendre Stroemfjord, Greenland
- Max-Planck-Inst. fuer Chemie, Mainz (West Germany)
- Danish Meteorological Inst., Copenhagen (Denmark)
Considerable amounts of chlorine dioxide, OClO, were observed from 5 January through 2 February, 1990 in the stratosphere above Soendre Stroemfjord 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{degree} and 89{degree} solar zenith angle (SZA). Furthermore, in the beginning of January OClO morning values exceed those found at dusk for comparable SZA whereas towards 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 {times} 10{sup 13} molec/cm{sup 2} and a comparison shows an increase from 1988 to 1990.
- OSTI ID:
- 5518102
- Journal Information:
- Geophysical Research Letters (American Geophysical Union); (United States), Journal Name: Geophysical Research Letters (American Geophysical Union); (United States) Vol. 18:4; ISSN GPRLA; ISSN 0094-8276
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540120* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ABSORPTION SPECTROSCOPY
ARCTIC REGIONS
ATMOSPHERIC CHEMISTRY
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
CHLORINE COMPOUNDS
CHLORINE OXIDES
DAILY VARIATIONS
DATA ANALYSIS
DECOMPOSITION
EARTH ATMOSPHERE
ECOLOGICAL CONCENTRATION
ELECTROMAGNETIC RADIATION
GREENLAND
HALOGEN COMPOUNDS
LAYERS
LOSSES
OXIDES
OXYGEN COMPOUNDS
OZONE LAYER
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
POLAR REGIONS
RADIATIONS
SPECTROSCOPY
STRATOSPHERE
ULTRAVIOLET RADIATION
VARIATIONS
VISIBLE RADIATION