Visible and near-ultraviolet spectroscopy at McMurdo Station, Antarctica. 6. Observations of BrO
- NOAA, Boulder, CO (United States)
- Univ. of Colorado, Boulder (United States)
Observations of the evening twilight BrO abundance over McMurdo Station, Antarctica during austral spring, 1987, are described. The observed variation of the slant column abundance with increasing solar zenith angles suggests that most of the BrO is located near 15 km. The total vertical column abundance observed during 1 week of measurements yielded an average value of 2.5 {times} 10{sup 13} cm{sup {minus}2}, assuming the room temperature absorption cross sections measured by Cox et al. (1982). These values are consistent with BrO mixing ratios of about 5-15 parts per trillion by volume distributed from 150 to 20 mbar. If the differential absorption cross section of BrO increases by 30% at temperatures characteristic of the Antarctic lower stratosphere, as indicated by Sander and Watson (1981), then the BrO measurements reported in this paper should be decreased by 30%.
- OSTI ID:
- 6996042
- Journal Information:
- Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 94:D14; ISSN 0148-0227; ISSN JGREA
- Country of Publication:
- United States
- Language:
- English
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54 ENVIRONMENTAL SCIENCES
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ABSORPTION SPECTROSCOPY
AMBIENT TEMPERATURE
ANTARCTIC REGIONS
ANTARCTICA
ATMOSPHERIC CHEMISTRY
BROMINE COMPOUNDS
BROMINE OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISTRY
DISTRIBUTION
EARTH ATMOSPHERE
ECOLOGICAL CONCENTRATION
ELECTROMAGNETIC RADIATION
HALOGEN COMPOUNDS
HOLES
LAYERS
LOSSES
NEAR ULTRAVIOLET RADIATION
OXIDES
OXYGEN COMPOUNDS
OZONE LAYER
PHOTOCHEMICAL REACTIONS
POLAR REGIONS
RADIATIONS
SPECTROSCOPY
STRATOSPHERE
ULTRAVIOLET RADIATION
VISIBLE RADIATION