Atmos. Chem. Phys. Discuss., 2, 339-356, 2002
www.atmos-chem-phys-discuss.net/2/339/2002/
doi:10.5194/acpd-2-339-2002
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Surface ozone depletion episodes in the Arctic and Antarctic from historical ozonesonde records
D. W. Tarasick and J. W. Bottenheim
1Environment Canada, 4905 Dufferin Street, Downsview, ON, M3H 5T4 Canada

Abstract. Episodes of ozone depletion in the lowermost Arctic atmosphere (0--2 km) at polar sunrise have been intensively studied at Alert, Canada, and are thought to result from catalytic reactions involving bromine. Recent observations of high concentrations of tropospheric BrO over large areas of the Arctic and Antarctic suggest that such depletion events should also be seen by ozonesondes at other polar stations. An examination of historical ozonesonde records shows that such events occur frequently at Alert, Eureka and Resolute, but much less frequently at Churchill and at other stations. The differences appear to be attributable to differences in surface meteorology. The long record at Resolute shows depletions since 1966, but with an apparent increase in their frequency since about 1985. This is surprising, since the Br involved in the depletion mechanism is believed to be entirely of natural origin.

Citation: Tarasick, D. W. and Bottenheim, J. W.: Surface ozone depletion episodes in the Arctic and Antarctic from historical ozonesonde records, Atmos. Chem. Phys. Discuss., 2, 339-356, doi:10.5194/acpd-2-339-2002, 2002.
 
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