Notes: (The lastest  update in May 2006)

     1. All GAGE data (except CH4 and N2O)  have been calibrated to the 
        Scripps Institution of Oceanography's SIO-2005 scale. The factors 
        (SIO-2005/SIO-1998) for measured species are following,

        Species   factor (SIO-2005/SIO-1998)
       ========   ==========================
        CFC-11,     0.9945
        CFC-12,     1.000
        CH3CCl3,    0.9957
        CCl4,       1.000
        CFC-113,    1.0042

     2. The N2O data are still in SIO-1998 scale

     3. The CH4 data are originally in the CSIR-94 scale (Steele et al., 
        Baseline Atmospheric Program Australia 1994-95, Francey et al.,
        eds., Bureau of Meteorology and CSIRO-DAR, Melbourne, pp. 107-110,
        1996). In current update, the CSIRO CH4 standard is multiplied by 
        1.0119 to converted to the Tohoku University standard, which is 
        developed by T. Nakazawa and co-workers at Tohoku University,
        Sendai, Japan,  in collaboration with the Nippon Sanso company
        (Aoki et al., 1992).


-------------------------------------------------------------------------------

Notes: (Previous update in July 2000)

     1. GAGE data (except CH4) have changed to new SIO-1998 scale. Please 
        see Prinn et al., (2000) paper for detail description of SIO-1998 scale.
   
     2. All times during the GAGE program are in local standard time. 

     3. All N2O data at Samoa during 1996 are discarded from GAGE data set.


Reference:

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