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This past spring, the Arctic stratosphere’s ozone layer suffered unprecedented depletion. But whether the record loss constituted a “hole” depends on which experts you consult.
In a,
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?Nature?paper published online earlier this week, Gloria Manney of NASA’s Jet Propulsion Laboratory in Pasadena and more than two dozen coauthors describe the 2011 loss as “an Arctic ozone hole.” Other renowned scientists have been weighing in — and some argue that as dramatic as this year's thinning was, a hole it wasn't.

Reports of a putative hole in the far North’s ozone are far from new. A quarter century ago to this day,
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, Science News ran a story noting that “while everyone’s attention has been riveted on the atmosphere above Antarctica, a NASA researcher has discovered what he believes is another ozone cavity that forms each [winter] on the other side of the world. . . . This Arctic ozone hole is ‘not as large in magnitude, but it’s unquestionably there.'"
Since then,
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, descriptions of the recurrent depletion of Arctic ozone have been scaled back to more of just a demonstrable thinning. There's been little question that its triggers,
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, however,
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, are?identical to those that seasonably eat away huge portions of Antarctica’s stratospheric ozone.

What made 2011 different — and a watershed — argues Michelle Santee (a JPL colleague of Manney's and coauthor on the new paper),
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, is that at long last,
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, “the magnitude of the [Arctic]

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