Bromine and Surface Ozone Atmospheric Chemistry at Barrow, Alaska During Spring 1989,
COLORADO UNIV AT BOULDER
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Measurements were made of surface ozone, particulate bromine and organic gaseous bromine species at Barrow, Alaska during March and April 1989 with a view to examining the causes of surface ozone destruction during the arctic spring. It was found that during major ozone depletion events 03 25 ppbv concentrations of particulate bromine and the organic brominated gases bromoform and dibromo-chloromethane were elevated. A fast production rate of particulate bromine was shown by irradiating ambient nighttime air at Barrow in a chamber with actinic radiation that simulated midday conditions for that season and latitude. Such rapid reactions are not in keeping with gas phase photolysis of bromoform, but further studies showed evidence for a substantial fraction of organic bromine in the particulate phase, thus heterogenous reactions may be important.
- Geology, Geochemistry and Mineralogy
- Atmospheric Physics