Image:Ozone cfc trends.png

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CFC gas trends and equivalent chlorine effect.

Combined chlorine and bromine in the lower stratosphere (10-25 km), where most ozone loss occurs, leveled off around 1999. Bromine is included as an ozone-depleting chemical because although it is not as abundant as chlorine, it is 45 times more effective per atom in destroying stratospheric ozone. Earlier measurements showed that the peak of equivalent chlorine (chlorine + 45 times bromine) had already occurred at the surface between mid- 1992 and mid- 1994. Template:Ref

The observed decrease is driven by a large and rapid decline in methyl bromide, a brominated gas that is regulated internationally by the Montreal Protocol. It is larger than that expected from model calculations as given in the WMO/UNEP 2002 Scientific Assessment to Ozone Depletion. Template:Ref Template:Ref

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Public domain This image is in the public domain because it contains materials that originally came from the U.S. National Oceanic and Atmospheric Administration.

Source: from CMDL Data Archive:

date/time username edit summary
20:44, 9 June 2005 en:User:SEWilco (<span class="autocomment"><a href="/wiki/Image:Ozone_cfc_trends.png#References" title="Image:Ozone cfc trends.png">→</a>References -</span> more complete version)
21:16, 2 April 2005 en:User:SEWilco (link to 3rd reference)
15:34, 2 April 2005 en:User:Mozzerati (<span class="autocomment"><a href="/wiki/Image:Ozone_cfc_trends.png#References" title="Image:Ozone cfc trends.png">→</a>References -</span> make into numbered list, but what's the last reference? It's not used? See <a href="/wiki/Wikipedia:Footnote3" title="Wikipedia:Footnote3">Wikipedia:Footnote3</a>)
15:33, 2 April 2005 en:User:Mozzerati (update {{endnote| template to be {{note| according to recent consensus. See <a href="/wiki/Wikipedia:Footnote3" title="Wikipedia:Footnote3">Wikipedia:Footnote3</a> and talk page.)
06:32, 18 March 2005 en:User:SEWilco (updates)
05:33, 18 March 2005 en:User:SEWilco (updates)
05:11, 18 March 2005 en:User:SEWilco (CFC gas trends. ==Related images== <gallery> Image:Major greenhouse gas trends.png|Greenhouse gas trends </gallery> ==Source== {{PD-USGov-DOC-NOAA}} Source: or

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