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Ozone depletion
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ozone depletion Three researchers in winter clothing launch a large transparent balloon carrying an ozonesonde on a snowy field at South Pole Station in Antarctica, with research buildings in the background. A vertical flowchart outlines the main steps in stratospheric ozone depletion, starting with emissions of halogen source gases, followed by accumulation, transport to the stratosphere, chemical conversion, ozone-depleting reactions, the role of polar stratospheric clouds, and ending with removal of reactive gases by rain. Each step is described in a labeled box with downward arrows connecting the sequence. Southern Hemisphere ozone hole Ozone depletion ozone: hole
At a Glance
Combination shot of Grinnell Glacier taken from the summit of Mount Gould, Glacier National Park, Montana in the years 1938, 1981, 1998 and 2006.
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Ozone depletion: Media

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ozone depletion
The Antarctic ozone hole reaches its maximum extent in October of each year. On October...
NASA Ozone Watch
ozonesonde
Researchers launching a balloon carrying an ozonesonde, an instrument that measures...
NOAA
ozone depletion process
A flowchart depicting the principal steps in the depletion of stratospheric ozone.
Encyclopædia Britannica, Inc.
Ozone depletion
Antarctic ozone hole, September 17, 2001.
NASA/Goddard Space Flight Center
ozone: hole
Changes in the size of the ozone hole from October 1979 to October 1990.
© Photos.com/Thinkstock

Interactives

Southern Hemisphere ozone hole
Two bar graphs depicting the maximum ozone hole size and the minimum ozone coverage...
Encyclopædia Britannica, Inc.
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