November, 2007

     1. The latest update includes 12 compounds (from GCMS-ADS) through 
        December 2004. Previously withhold CH3Br data between Nov. 2002
        and Dec. 2004 (at Mace Head, and Cape Grim) are included in this
        update after further evaluation. 

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

     3. All archived GC-MS-ADS data (except CH2Cl2, CHClCCl2 and CCl2CCl2) have
        been calibrated to SIO-2005 scale since May 2005. Compared to previous
        scale (SIO-1998), this new scale results in 0 to ~2.7% change in 
        reported mole fractions. Please see Prinn et al., (2000) paper for detail 
        description of SIO-1998 scale.

     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