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English: Ozone-depleting gas equivalent chlorine decline.
Combined w:chlorine and w:bromine in the lower w:stratosphere (10–25 km), where most w: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.[CMDL20010206] The observed decrease is driven by a large and rapid decline in w:methyl bromide, a brominated gas that is regulated internationally by the w:Montreal Protocol. It is larger than that expected from model calculations as given in the WMO/UNEP 2002 Scientific Assessment to Ozone Depletion. [CMDL20030815][CMDL27hats5] |
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Related images
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Greenhouse gas trends
References
- ^ News Release Feb 6, 2001. Climate Monitoring and Data Laboratory. Archived from the original on 2006-09-29. Retrieved on March 17, 2005.
- ^ CMDL Scientists find that ozone-depleting bromine is now on the decline. Climate Monitoring and Data Laboratory. Archived from the original on 2006-09-29. Retrieved on June 9, 2005.
- ^ Halocarbons and other Atmospheric Trace Species. Climate Monitoring and Data Laboratory Summary Report #27. Archived from the original on 2007-02-21. Retrieved on March 17, 2005.
| source = Source: ftp://140.172.192.211/hats/Total_Cl_Br/totCl_2004.ps from CMDL Data Archive: http://www.cmdl.noaa.gov/info/ftpdata.html | date = | author = | permission = | other_versions = | additional_information = }}
Source
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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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 06:33, 18 March 2005 | | 865 × 469 (9 KB) | SEWilco | updated image |
| 04:53, 18 March 2005 |  | 1,297 × 768 (17 KB) | SEWilco | ||
| 19:54, 17 March 2005 |  | 640 × 480 (13 KB) | SEWilco | CFC chlorine decline. {{PD-USGov-DOC-NOAA}} Source: http://www.cmdl.noaa.gov/albums/cmdl_overview/Slide13.sized.png |
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