The file names consist of the appropriate 3-letter code plus an additional 3 characters identifying the latitude bin and the .co2 extension. The equator is specified by 000 . The mixing ratios were determined by a nondispersive infrared absorption technique. The file names consist of the appropriate 3-letter code plus an additional 3 characters identifying the latitude bin and the .co2 extension. The equator is specified by 000 .
All data files have the same format.
MM is the two-digit GMT month when the air sample was collected. Missing values are denoted by 99. DD is the two-digit GMT day when the air sample was collected. Missing values are denoted by 99. HR is the two-digit GMT hour when the air sample was collected.