File:Greenland Firn CFCs.png
Measured depth profiles of anthropogenic gases in Greenland w:firn air.
(Analysis provided by CMDL.)
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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http://www.cpc.ncep.noaa.gov/products/assessments/assess_99/fig76.html