July, 2011

     1. The latest update includes 18 compounds (from GCMS-ADS) through 
        December 2004. there are 6 new species are included in the update.
        Data from Zeppelin are also included in this update.

     2. Currently GC-MS-ADS data are available at Mace Head, Ireland, 
        Cape Grim, Tasmania, Jungfraujoch and Zepplein.

     3. The scale and unit of measured compounds can be found in header lines
        of data file

     4. All times during the AGAGE program are in universal (UTC,
        formerly GMT) time. Note that this differs from times
        given with the ALE and GAGE data bases which use local
        standard time at each station.

Reference:

     1. Prinn et al., A history of chemically and radiatively important
        gases in air deduced from ALE/GAGE/AGAGE, J. Geophys. Res.,
        Vol. 105, No. D14, p17,751-17,792, 2000.

     2. Simmonds, P.G., S. O'Doherty, J. Huang, R. G. Prinn, R. G. Derwent,
        D. Ryall, G. Nickless, and D. M. Cunnold, Calculated trends and the
        atmospheric abundence of 1,1,1,2-tetrafluorethane,  1,1-dichloro-1-
        fluorethane, and 1-chloro-1,1-difluorethane using automated in-situ
        gas chromatography-mass spectrometry measurements recorded at Mace
        Head, Ireland from October 1994 to March 1997. J. Geophys. Res., 103,
        16029-16038, 1998

     3. please see "publications.doc" file or AGAGE web site 
        (http://agage.eas.gatech.edu) for more references