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Ozone-depleting gas trends and equivalent chlorine effect.

Combined chlorine and bromine in the lower atmosphere or troposphere from the most abundant chlorinated and brominated chemicals controlled by the Montreal Protocol. These changes are reflected in the upper atmosphere stratosphere (10-25 km), where most ozone loss occurs, with a delay (due to air transport) of 3-5 years. Bromine is included as an ozone-depleting chemical because although it is not as abundant as chlorine, it is 45 to 60 times more effective per atom in destroying stratospheric ozone. Earlier measurements showed that the peak of equivalent chlorine (chlorine + 45 (or 60) times bromine) occurred at the surface between mid- 1992 and mid- 1994.[CMDL20010206]

The observed decrease is driven by a large and rapid decline in methyl chloroform and methyl bromide, gases that are regulated internationally by the Montreal Protocol. The initial decline in methyl bromide was larger than that expected from projections given in the WMO/UNEP 2002 Scientific Assessment to Ozone Depletion.[CMDL20030815][CMDL27hats5]

Related images


  1. ^  News Release Feb 6, 2001. Climate Monitoring and Data Laboratory (March 17).
  2. ^  CMDL Scientists find that ozone-depleting bromine is now on the decline. Climate Monitoring and Data Laboratory (June 9).
  3. ^  Halocarbons and other Atmospheric Trace Species. Climate Monitoring and Data Laboratory Summary Report #27 (March 17).


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, taken or made as part of an employee's official duties.

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Source: from CMDL Data Archive:

date/time username edit summary
20:44, 9 June 2005 en:User:SEWilco ( →References - more complete version)
21:16, 2 April 2005 en:User:SEWilco (link to 3rd reference)
15:34, 2 April 2005 en:User:Mozzerati ( →References - make into numbered list, but what's the last reference? It's not used? See Wikipedia:Footnote3)
15:33, 2 April 2005 en:User:Mozzerati (update {{endnote| template to be {{note| according to recent consensus. See Wikipedia:Footnote3 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== Image:Major greenhouse gas trends.png|Greenhouse gas trends ==Source== {{PD-USGov-DOC-NOAA}} Source: or

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