These and other figures are accessible through our anonymous FTP. You can either FTP to ftp.cmdl.noaa.gov, logon with user "anonymous" and your email address as a password, then select subdirectory "hats" followed by "graphs", or you can click HERE to get there.
To download a figure below, simply right click on the image and select "Save Picture As...".
Latest in situ program figures can be found here.
Trends of Controlled Ozone Depleting Chemicals are shown below. For information, please contact James.W.Elkins@noaa.gov .
Our best datasets for the main chlorine containing gases that are regulated by the Montreal Protocol from four NOAA baseline observatories and Niwot Ridge in Colorado. Combined datasets from four programs (Old flask GC, Otto flask GC, RITS and CATS in situ), where all use electron capture gas chromatographic methods. Mass spectrometer data are not included at this time. Detailed documentation for CFC-11 and -12 are available at http://www.esrl.noaa.gov/gmd/hats/combined/CFC11.html and http://www.esrl.noaa.gov/gmd/hats/combined/CFC12.html.
Trends of the CFCs, HCFCs, halons, chlorinated solvents, and effective equivalent chlorine (EECl) from the GMD halocarbon flask and in situ network. Commonly Used Halons Below
Published by Butler et al.  ( Journal of Geophysical Research, 103(D1) , 1503-1511, 1998). For more information, contact James.H.Butler@noaa.gov . For more information on total chlorine, contact Stephen.A.Montzka@noaa.gov .