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

“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,
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," she says,?"I think it’s fair to say that we didn’t.”

It may be a matter of semantics,
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, 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, rendering it vulnerable to ozone-destroying chemical reactions). Such a resupply does not occur in the Antarctic vortex, 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,
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, “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,
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, the losses won't be substantially worse, he says.?
Warming surface temperatures can cool the stratosphere, 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

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