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| Uchino O., R.D. Bojkov, D.S. Balis, K. Akagi, M. Hayashi and R. Kajiwara | [abstract]
Using both ground-based and satellite data up to December 1998, the intensity, duration, appearance at both horizontal and vertical scales and ozone-mass deficiency (O3MD) of the severe ozone decline observed over the southern polar region are presented. Over the last six years: the depletion within the ozone hole area (i.e. total ozone amounts <220 m atm-cm) is almost three times more severe than in the early 1980s, the ozone hole (O3h) area has exceeded 22 million km2 at its maximum, and the lowest total ozone was ~100 m atm-cm. However, during the 1998 season for the first time for nearly 20 days the O3h area exceeded 25 million km2, and the integrated O3MD during September-October, poleward of 600S, exceeded the average value of the 1990s by ~25%. At the beginning of the 1980s, ozone hole values were observed mostly in October, but more recently, they frequently continue until mid-December. The depletion was most severe in the 12?20 km layer over Antarctica: ~70% in September, ~90% in October and ~80% in November. Related to this, the monthly mean lower stratospheric temperatures between 70-900S have declined by ~100C in October, ~120C in November and by ~50C in December. Taking the last six years seasonally integrated O3MD over the area >600S (average ~6,300 Mt) is about a third greater than the O3MD over the northern polar region winter-springs. Over the southern mid-latitudes O3MD is about a third less than the deficiency observed between 35-550N. | [keywords]
Atmospheric temperature; Climate change; Ozone; Upper atmosphere, Ozone-mass deficiency, Geophysics, ozone; spring (season), Antarctica | | Geophysical Research Letters, 26 (10), pp. 1377-1380, 1999 | | http://www.scopus.com/scopus/inward/record.url?eid=2-s2.0-0033562306&partnerID=40 |  back to publications list |
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