Physics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13.1236b&link_type=abstract
Geophysical Research Letters (Supplement) (ISSN 0094-8276), vol. 13, Nov. 1986, p. 1236-1239.
Physics
39
Annual Variations, Antarctic Regions, Depletion, Ground Truth, Ozone, Atmospheric Circulation, Autumn, Vertical Distribution, Vortex Breakdown
Scientific paper
Since 1979, from late September to the end of November, the total ozone over the southern polar region has declined by up to 30 percent, compared with the ozone average for 1957-78. During the rest of the year there are no indications of a major decline. Neither are there significant changes in the middle latitudes surrounding Antarctica except those related to the QBO. More than 85 percent of the entire ozone deficiency is observed between 10 and 24 km. The rapid ozone and temperature increase in spring usually occurs in mid October and shows a two-month lag, compared to the Arctic. The increase is related to the time of the breakdown of the winter stratospheric polar vortex. During the last six years the breakdown has occurred around mid-November, extending the period with circumpolar circulation by 3-4 weeks. It is suggested that weak upward motions within the vortex, in the order of 0.1 cm/sec during September and October, could cause part of the ozone decline.
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