greatly dwarfs the Arctic region that experienced substantial thinning earlier this year,
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.

“Going into this Arctic spring,
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, many of us — myself included — really thought this might be the year that we would see a real Arctic ozone hole,” observed Susan Solomon, of the University of Colorado, Boulder,
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, at the recent American Chemical Society meeting in Denver. "But in the end," she says,?"I think it’s fair to say that we didn’t.”

It may be a matter of semantics, she concedes, but there was a rapid resupply of ozone from outside the Arctic vortex (that swirling wall of winds in the stratosphere that largely corrals a patch of atmosphere,
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, rendering it vulnerable to ozone-destroying chemical reactions). Such a resupply does not occur in the Antarctic vortex,
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, she notes; and that's what permits its stratospheric ozone concentrations to plummet to zero over a several-kilometer height.
So,
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, although the new paper clearly demonstrates that at some altitudes Arctic?ozone was efficiently destroyed, Solomon says,?“I wouldn’t call this an ozone hole.”?
Whatever you call 2011's Arctic ozone depletion, “I consider this to be a ‘big deal,’” says Ross Salawitch of the University of Maryland in College Park. Moreover, there’s no reason to suspect that in some future years, the losses won't be substantially worse, he says.?
Warming surface temperatures can cool the stratosphere,
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, promoting conditions that accelerate ozone depletion,
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, he notes. It takes prolonged cold temperatures in the winter and spring stratosphere to maximize

http://www.elllo.org/graphics/

http://mejora-e-pyme.c...c=20376.msg20456#msg20456

http://www.saturnotruc...opic.php?f=2&t=309944