*********************************************************************************************** ***Atmospheric CO2 concentrations from South Pole (July 1998) *** *** *** *** Source: C.D. Keeling *** *** T.P. Whorf *** *** Scripps Institution of Oceanography *** *** University of California *** *** La Jolla, California USA 92093-0220 *** *********************************************************************************************** Year Jan. Feb. Mar. Apr. May Jun. July Aug. Sept. Oct. Nov. Dec. Annual 1957 -99.99 -99.99 -99.99 -99.99 -99.99 313.21 -99.99 -99.99 313.71 -99.99 -99.99 314.31 -99.99 1958 -99.99 -99.99 314.13 -99.99 -99.99 314.36 -99.99 -99.99 315.16 -99.99 -99.99 -99.99 -99.99 1959 314.93 314.97 314.92 -99.99 -99.99 -99.99 -99.99 315.81 316.06 -99.99 316.16 -99.99 -99.99 1960 -99.99 -99.99 -99.99 -99.99 -99.99 316.22 316.53 316.59 -99.99 -99.99 -99.99 -99.99 -99.99 1961 -99.99 -99.99 -99.99 -99.99 316.63 316.70 316.78 317.19 317.52 317.57 317.71 317.51 -99.99 1962 317.30 317.10 316.90 316.95 317.02 317.09 317.11 317.48 317.91 -99.99 -99.99 318.47 -99.99 1963 317.97 317.71 317.31 317.74 318.10 318.06 318.10 318.47 318.40 318.85 -99.99 -99.99 -99.99 1964 -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 1965 -99.99 318.53 318.40 318.52 318.73 -99.99 319.22 319.51 -99.99 -99.99 320.01 320.11 -99.99 1966 320.18 319.84 319.89 320.15 320.28 320.29 -99.99 320.91 321.19 321.30 321.40 320.90 320.58 1967 -99.99 320.85 -99.99 320.70 320.84 320.79 320.90 321.67 321.91 321.64 321.66 321.61 -99.99 1968 321.37 -99.99 -99.99 321.45 321.31 321.28 321.34 -99.99 -99.99 -99.99 -99.99 322.49 -99.99 1969 322.20 -99.99 322.11 322.13 322.42 322.63 323.08 323.43 323.97 323.79 323.81 -99.99 -99.99 1970 -99.99 323.37 323.27 323.51 323.62 324.01 324.31 324.55 325.01 325.03 325.07 -99.99 -99.99 1971 324.64 324.44 324.15 324.31 324.51 324.74 324.99 -99.99 325.60 -99.99 325.58 -99.99 -99.99 1972 -99.99 -99.99 324.88 325.00 325.15 325.66 325.97 326.69 326.37 326.61 326.78 326.65 -99.99 1973 326.58 326.17 326.19 326.66 326.94 327.26 327.57 328.24 328.53 328.46 328.43 328.42 327.45 1974 328.13 327.92 327.91 327.73 327.84 327.71 328.29 328.52 328.78 328.88 328.96 328.82 328.29 1975 328.72 328.73 328.68 328.77 328.76 328.90 329.18 329.66 330.06 330.39 330.29 330.10 329.35 1976 330.12 329.84 329.73 329.47 329.77 329.81 330.30 330.85 331.22 331.54 331.57 331.25 330.46 1977 331.09 330.83 330.68 331.15 331.23 331.45 331.89 332.29 332.70 332.93 333.14 333.01 331.87 1978 332.67 332.54 332.65 332.81 -99.99 333.20 333.65 334.11 334.56 334.66 334.41 334.13 333.54 1979 333.84 333.87 333.65 334.00 334.17 334.37 334.98 335.55 335.70 335.84 336.20 335.87 334.84 1980 335.89 335.58 -99.99 335.92 336.04 336.73 337.28 337.37 337.70 337.73 337.80 337.87 336.81 1981 337.59 337.31 337.25 337.36 337.50 337.98 338.24 338.59 338.64 338.98 338.69 338.74 338.07 1982 -99.99 338.47 338.21 338.53 338.82 339.01 339.17 339.94 340.13 340.16 339.87 339.78 339.22 1983 339.68 339.67 339.68 340.14 340.45 340.83 341.23 341.71 342.14 342.11 342.37 342.17 341.02 1984 341.87 -99.99 341.54 341.66 341.69 341.85 342.63 343.02 343.27 343.32 343.14 342.97 342.39 1985 342.83 342.64 342.55 342.59 342.94 343.28 343.76 344.34 344.68 344.77 344.61 344.46 343.62 1986 344.46 344.38 344.32 344.45 344.51 344.84 345.37 345.76 346.00 345.98 345.99 345.86 345.16 1987 345.71 345.62 345.57 345.94 346.04 346.44 347.03 347.45 347.89 347.92 348.02 348.13 346.81 1988 348.11 347.89 347.72 348.04 348.17 348.42 348.91 349.43 349.59 349.74 349.69 349.68 348.78 1989 349.65 349.60 349.50 349.58 349.77 350.02 350.45 350.97 351.22 351.15 351.18 350.83 350.33 1990 350.61 350.27 350.50 350.76 351.23 351.45 351.93 352.42 352.62 352.44 352.70 352.50 351.62 1991 -99.99 352.21 352.18 352.34 352.44 352.86 353.31 353.58 353.98 353.78 353.85 353.67 353.05 1992 353.47 353.09 352.97 353.17 353.68 353.94 354.55 354.89 355.19 355.30 355.03 354.82 354.17 1993 354.66 354.47 354.20 354.40 354.47 354.81 355.18 355.68 356.02 356.03 355.99 355.67 355.13 1994 355.48 355.48 355.53 355.66 355.71 356.01 356.49 357.14 357.63 357.55 357.73 357.54 356.49 1995 357.48 357.40 357.40 357.67 357.86 357.98 358.38 358.79 359.19 359.34 359.47 359.51 358.37 1996 359.40 359.35 359.30 359.41 359.45 359.75 360.21 360.57 360.75 360.75 360.78 360.75 360.04 1997 360.61 360.53 360.38 360.54 360.65 360.97 361.31 361.59 362.01 362.06 362.18 362.20 361.25 Atmospheric concentrations of CO2 are expressed in parts per million (ppm) and reported in the preliminary 1997 SIO manometric mole fraction scale. Missing values are denoted by -99.99. In years where one monthly value is missing annual values were calculated by substituting a fit value (4-harmonics with gain factor and spline) for that month and then averaging the twelve monthly values. For additional information please see http://cdiac.esd.ornl.gov/trends_html/trends/co2 or contact Tom Boden at the Carbon Dioxide Information Analysis Center (tab@ornl.gov or 423-241-4842).