Physics
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1377u&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 10, p. 1377-1380
Physics
12
Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Global Change: Atmosphere, Atmospheric Composition And Structure: Evolution Of The Atmosphere
Scientific paper
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 60°S, 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 70-90°S have declined by ~10°C in October, ~12°C in November and by ~5°C in December. Taking the last six years seasonally integrated O3MD over the area poleward of 60°S (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 35-55°N.
Akagi Kazuaki
Balis Dimitris S.
Bojkov Rumen D.
Hayashi Motowo
Kajihara Ryoichi
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