******************************************************************* *** Atmospheric CO2 concentrations (ppmv) derived from flask *** *** air samples collected at La Jolla Pier, California, U.S.A. *** *** (flask data, 1973-1975 continuous data) *** *** Source: C.D. Keeling *** *** T.P. Whorf, and the Carbon Dioxide Research Group *** *** Scripps Institution of Oceanography (SIO) *** *** University of California *** *** La Jolla, California USA 92093-0444 *** *** *** *** May 2005 *** *** *** ******************************************************************* Year Jan. Feb. Mar. Apr. May Jun. July Aug. Sept. Oct. Nov. Dec. Annual Annual-Fitted 1969 -99.99 326.48 -99.99 328.05 -99.99 326.29 -99.99 -99.99 -99.99 324.70 -99.99 -99.99 -99.99 -99.99 1970 -99.99 -99.99 -99.99 329.15 331.70 328.09 -99.99 -99.99 322.34 -99.99 -99.99 327.30 -99.99 326.86 1971 329.73 328.93 330.41 330.59 329.98 324.53 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 327.49 1972 -99.99 -99.99 -99.99 330.95 332.21 -99.99 326.45 -99.99 322.71 325.37 328.28 329.76 -99.99 328.15 1973 330.19 331.14 331.84 333.21 333.67 332.84 329.25 324.91 325.13 328.62 329.87 331.28 330.16 330.20 1974 331.90 333.49 333.47 334.42 335.24 333.82 330.09 326.66 326.29 328.62 331.32 332.22 331.46 331.49 1975 333.99 333.62 333.99 335.19 336.17 333.56 330.35 326.53 327.54 329.00 -99.99 333.91 (332.16) 332.14 1976 -99.99 334.93 -99.99 -99.99 -99.99 334.80 -99.99 328.71 326.62 -99.99 -99.99 334.30 -99.99 333.16 1977 336.33 335.51 336.84 -99.99 338.52 -99.99 333.25 -99.99 -99.99 334.21 -99.99 -99.99 -99.99 334.79 1978 -99.99 -99.99 -99.99 339.70 339.18 336.37 -99.99 331.49 330.08 -99.99 336.64 -99.99 -99.99 336.30 1979 338.61 339.76 341.11 341.36 -99.99 -99.99 -99.99 333.47 -99.99 -99.99 -99.99 -99.99 -99.99 338.02 1980 -99.99 -99.99 341.13 -99.99 341.62 -99.99 -99.99 333.92 -99.99 337.78 -99.99 341.01 -99.99 339.58 1981 342.24 343.85 -99.99 -99.99 345.34 -99.99 337.96 336.57 -99.99 339.19 340.13 342.30 -99.99 341.08 1982 343.97 -99.99 343.83 -99.99 346.45 342.32 340.15 -99.99 335.75 -99.99 341.62 343.08 -99.99 341.88 1983 344.49 344.55 345.49 347.16 347.92 344.75 340.74 337.00 338.93 341.39 342.89 345.04 343.36 343.48 1984 345.88 347.56 347.49 349.02 349.44 347.19 342.85 339.80 340.62 343.03 344.88 347.65 345.45 345.36 1985 348.03 348.74 349.17 348.39 350.15 349.21 344.74 340.03 340.37 343.33 346.28 -99.99 (346.37) 346.51 1986 -99.99 350.86 349.73 351.51 351.75 349.76 345.43 -99.99 341.84 -99.99 346.80 350.53 -99.99 347.74 1987 350.25 351.35 351.15 352.35 353.10 352.51 347.70 342.74 345.58 347.25 350.06 352.28 349.69 349.64 1988 352.73 352.56 353.52 355.15 356.65 354.37 351.48 346.61 347.17 350.26 352.40 354.71 352.30 352.35 1989 355.66 355.57 356.23 357.05 357.88 354.90 350.87 347.18 346.87 350.85 353.80 354.36 353.44 353.56 1990 356.33 357.17 357.17 357.78 359.07 355.89 352.01 348.19 349.53 353.18 354.80 355.97 354.81 354.86 1991 -99.99 358.49 359.79 359.66 360.59 358.06 354.79 350.17 350.31 353.97 357.86 357.66 (356.59) 356.38 1992 359.45 358.86 359.58 360.53 360.96 359.23 352.86 350.41 350.01 353.86 -99.99 358.35 (356.72) 356.80 1993 359.61 359.81 360.08 361.28 362.12 359.88 354.96 351.04 351.50 354.95 357.11 359.93 357.69 357.66 1994 360.33 361.44 361.89 362.76 363.66 361.67 356.79 352.89 352.57 357.13 359.69 362.66 359.46 359.38 1995 362.24 362.71 363.51 364.68 364.32 363.65 358.89 354.07 356.59 359.19 360.83 -99.99 (361.16) 361.26 1996 364.50 365.21 365.81 366.54 367.53 365.08 359.36 357.32 357.18 360.26 363.11 -99.99 (363.03) 363.02 1997 365.48 366.41 367.08 368.10 368.44 365.80 360.85 356.89 358.27 361.26 364.44 366.39 364.12 364.12 1998 366.85 368.05 367.98 370.42 370.30 367.80 364.99 360.69 361.91 366.09 -99.99 370.21 (366.92) 366.89 1999 369.45 371.64 371.85 373.53 373.92 370.57 364.91 362.69 361.26 365.98 368.35 369.94 368.67 368.75 2000 370.10 372.41 373.42 373.90 374.31 371.41 366.04 362.86 363.07 368.11 370.66 371.43 369.81 369.85 2001 372.35 373.88 374.29 375.85 376.52 373.39 367.24 364.81 364.13 368.26 372.71 373.31 371.40 371.40 2002 375.03 375.18 376.58 376.24 377.26 374.24 370.77 364.09 368.02 371.29 373.11 376.02 373.15 373.29 2003 -99.99 377.99 378.27 380.08 379.98 378.40 373.23 368.70 368.96 373.91 377.38 378.78 (376.06) 375.97 2004 380.01 380.25 380.87 381.80 381.82 379.61 375.57 369.71 370.40 375.60 -99.99 380.09 (377.82) 377.83 Monthly values are expressed in parts per million (ppm) and reported in the 2003A SIO manometric mole fraction scale. The monthly values have been adjusted to the 15th of each month. Missing values are denoted by -99.99. The "annual" average is the arithmetic mean of the twelve monthly values. In years with one or two missing monthly values, 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.