Jan., 2013

     1. The latest update include data through Mar., 2012

     2. Most of ALE/GAGE/AGAGE data are in either SIO-2005 or 
        SIO-1998 scale. Please see Prinn et al., (2000) paper 
        for detail description of SIO-1998 scale. The scale
        and unit of measued compounds are indicated in the
        header lines

     3. Please see "readme.scale" , "COcalibration.doc", and
        "H2calibration.doc" files regarding to calibration
        standard

     4. Cape Grim carbon monoxide (CO) data after Dec. 1999 is temporarily
        removed in this update due to non-linear problem. It
        will be added after appropriate correction is applied.

     5. Barbados CFC-113 data after Sep. 2005, and Mace Head 
        CFC-113 data after Mar. 2006 are also temporarily
        removed in this update for further evaluations. 

     6. 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.

     7. Mace Head H2 data are temporarily unavailable in this update 
        (They will be released soon after being reprocessed to new 
         calibration scale). 

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. see AGAGE web site "http://agage.eas.gatech.edu" for more
        references.