In September 2006 NASA satellite data revealed that the Antarctic ozone hole was larger than at any other time on record, at.
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Gunson said findings from the Atlantis flight suggest that chlorine is recombining in the Antarctic ozone hole as hydrochloric acid and chlorine nitrate.
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"We don't see any other plausible explanation for chlorine in the stratosphere at the levels that produce large-scale ozone losses like the Antarctic ozone hole ."
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But as the damage spread _ the Antarctic ozone hole covered a record 7.7 million square miles in October _ the depletion has reached populated areas.
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Arblaster is interested in the interplay between the predicted recovery of the Antarctic ozone hole over coming decades and greenhouse gas increases in future climate projections.
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Measurement of the size and intensity of the Antarctic ozone hole is an international operation in which cooperation between NASA and the Russian space agency has become important.
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The chlorine atoms are recycled when ClO reacts with O in the upper stratosphere, or when ClO reacts with itself in the chemistry of the Antarctic ozone hole.
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But as the damage spread _ the Antarctic ozone hole covered a record 7 . 7 million square miles in October _ the depletion has reached populated areas.
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The Antarctic ozone hole is an area of the Antarctic stratosphere in which the recent ozone levels have dropped to as low as 33 percent of their pre-1975 values.
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Early models failed to take PSCs into account and predicted a gradual global depletion, which is why the sudden Antarctic ozone hole was such a surprise to many scientists.
