Monthly atmospheric CO2 mixing ratios from Halley Bay, Antarctica.
Background atmospheric CO2 mixing ratios from individual flask air samples for
Halley Bay, Antarctica. 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 Halley Bay, Antarctica, 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
1983 339.90 339.93 340.17 340.50 341.03 341.74 341.88 342.14 342.56 342.34 342.34 342.36 341.41
1984 341.97 341.82 341.66 341.63 342.22 342.74 342.82 342.94 343.39 343.91 343.87 343.62 342.72
1985 343.23 343.13 343.73 344.19 344.31 344.27 344.06 344.48 345.02 345.12 345.23 345.14 344.33
1986 344.96 345.00 344.61 344.35 344.70 345.10 345.49 345.71 346.00 346.13 346.13 345.98 345.35
1987 346.00 346.56 346.58 346.18 346.44 347.09 347.60 347.94 348.35 348.72 348.95 348.74 347.43
1988 348.48 348.86 348.96 348.78 349.17 349.69 349.86 350.11 350.44 350.35 -99.99 -99.99 -99.99
1989 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99
1990 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99
1991 352.03 352.05 352.39 352.85 353.18 353.17 353.30 353.74 353.99 354.02 353.86 353.53 353.18
1992 353.15 352.82 352.84 354.04 355.32 355.59 355.30 354.97 355.23 355.54 355.29 354.87 354.58
1993 354.52 354.22 354.05 354.20 354.68 355.15 355.30 355.42 355.77 356.05 356.12 355.84 355.11