Friday, September 22, 2006

Antarctic ozone hole nears record: U.N. agency 1 hour, 25 minutes ago

Antarctic ozone hole nears record: U.N. agency 1 hour, 25 minutes ago

GENEVA (Reuters) - The hole over Antarctica's ozone layer is bigger than last year and is nearing the record 29-million-square-km (11-million-sq-mile) hole seen in 2000, the World Meteorological Organization said on Friday.

Geir Braathen, the United Nations weather agency's top ozone expert, said ozone depletion had a late onset in this year's southern hemisphere winter, when low temperatures normally trigger chemical reactions that break down the atmospheric layer that filters dangerous solar radiation.

"The ozone depletion started quite late, but when it started it came quite rapidly," Braathen told journalists in Geneva.

"It (the hole) has now risen to a level that has passed last year's, and is very close to, if not equal to, the ozone hole size of 2003, and also approaching the size of 2000," he said.

The Antarctic ozone hole was at its second-largest in 2003.

While use of ozone-depleting chlorofluorocarbons (CFCs) has waned, Braathen said large amounts of chlorine and bromine remain in the atmosphere and would keep causing large reductions in the Antarctic ozone layer for many years to come.

"We will for the next couple of decades expect to see recurring ozone holes of the size that we see now," he said.

The WMO and the U.N. Environment Program (UNEP) said in August that the protective layer would likely return to pre-1980 levels by 2049 over much of Europe, North America, Asia, Australasia, Latin America and Africa.

In Antarctica, the agencies said ozone layer recovery would likely be delayed until 2065.

1 comment:

Anonymous said...

In my geology class in college my professor (an amazing man with crazy red hair (no, I'm not describing your male counterpart) came in the room with a bag of stryfoam, poured it out and started yelling (not verbatim, but close) "this is bulls***, this is bulls***. No it's not, because at least bulls*** is biodegradable. and CFC's are not." And that was the beginning of an amazing class. (R)

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