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.^{[CMDL20010206]}

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.^{[CMDL20030815][CMDL27hats5]}

Related images

Greenhouse gas trends

References

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Source

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 during the course of an employee's official duties.

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