Monthly atmospheric CO2 mixing ratios from Christmas Island.
Background atmospheric CO2 mixing ratios from individual flask air samples for
Christmas Island. Only measurements satisfying the data selection criteria fro background
measurements are plotted. Consecutive background measurements are joined by lines. Background
measurements interrupted by non-background measurements are not joined by lines.
Monthly atmospheric CO2 mixing ratios for Christmas Island, expressed in parts per million (ppm) and reported in
the Scripps Institution of Oceanography X93 manometric mole fraction scale. Annual values were calculated by
CDIAC for years with complete records. Missing values are denoted by -99.99.
Year Jan Feb Mar April May June July Aug Sept Oct Nov Dec Ann
1984 -99.99 -99.99 345.67 346.74 346.51 345.53 345.15 344.57 343.77 343.47 344.02 344.95 -99.99
1985 345.40 345.92 346.74 347.06 347.11 347.03 346.37 345.67 345.07 344.51 345.00 346.10 346.00
1986 346.78 347.10 347.85 348.67 348.32 347.86 347.54 346.35 345.82 345.90 345.87 345.80 346.99
1987 346.60 347.96 348.88 349.91 350.37 349.84 349.05 348.73 348.51 348.07 348.24 349.45 348.80
1988 350.49 351.14 351.58 351.98 352.27 352.01 351.28 350.54 350.45 350.72 350.88 351.74 351.26
1989 352.94 353.71 354.67 354.54 353.63 353.50 353.67 353.09 352.27 352.04 352.17 352.74 353.25
1990 353.87 354.98 355.21 354.50 354.56 354.89 354.51 354.10 353.73 353.37 353.37 354.15 354.27
1991 354.96 355.50 356.30 356.45 356.16 356.31 355.84 354.77 353.95 354.17 354.89 355.25 355.38
1992 356.06 356.52 356.81 357.94 358.58 357.72 356.79 355.86 355.31 355.12 355.14 355.83 356.47
1993 356.80 357.01 357.33 358.78 359.36 358.07 357.44 357.10 356.56 356.04 356.25 357.17 357.33