Oct 30, 1996 Hole size
Oct 31, 1997 Hole Size
Long Term Evolution:
Latest Results (9/1/96 - 10/14/96)
Latest Results (9/1/97 - 10/14/97)
1995 Hole data:
Why do we see the hole in the Antarctic Spring?
Chlorine from CFCs is stored on stratospheric cloud surfaces during the long
polar night and then released to attack ozone when the sun returns in spring. The process involves a series
of unusual chemical reactions taking place at temperatures as low as -85 degrees C (188K). Normal
ozone levels are restored in the summer when the Antarctic atmosphere, isolated during the winter inside
"polar vortex", becomes mixed with ozone-rich air from other latitudes.
Expectations for this Spring (i.e. right now)
The Antarctic spring of this year is arriving, and with it the annual depletion of ozone within the south
polar vortex. In recent years, the destruction of ozone within the lower stratospheric region from 14 to 20
km has been virtually total.
Where are we Now?
Internet Resources Relevant to the Ozone Problem:
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