ozone hole


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Related to ozone hole: Ozone depletion

ozone hole

[′ō‚zōn ‚hōl]
(meteorology)
References in periodicals archive ?
"We don't expect to see a complete recovery until about 2050 or 2060 but we are starting to see that in September the ozone hole is not as bad as it used to be."
The minimum value of total ozone in the ozone hole was the second highest level in two decades.
''When Antarctica enters spring and there's sunshine, the ozone hole becomes huge,'' Al-Ghanem said.
Atmospheric scientists think chemical reactions involving CFCs are responsible for the infamous "ozone hole" over Antarctica, a 50-percent drop in ozone levels during September and October.
"While the current ozone hole is larger than in recent years, the area occupied by this year's hole is consistent with our understanding of ozone depletion chemistry and consistent with colder than average weather conditions in Earth's stratosphere, which help drive ozone depletion," Paul A.
The new research suggests that shifting wind patterns caused by the ozone hole push clouds farther toward the South Pole, reducing the amount of radiation the clouds reflect and possibly causing a bit of warming rather than cooling.
First spotted in 1985, the Antarctic ozone hole was quickly linked to chemicals called chlorofluorocarbons, emitted mainly in the Northern Hemisphere but concentrated over the South Pole by atmospheric circulation.
Each year the ozone hole is measured daily between Sept.
The appearance of the Antarctic Ozone Hole was a major cultural phenomenon that lead to the Montreal Protocol, an international agreement to reduce ozone-destroying chemicals.
1985: Scientists from British Antarctic Survey announce discovery of "ozone hole" above Antarctica.
It was only after the ozone hole had been discovered in 1985 that the production of CFC was largely restricted.
Since the beginning of the 1980s, an ozone hole has developed over Antarctica during the southern spring - September to November - resulting in a decrease in ozone concentration of up to 70 percent.