******************************************************************* *** Atmospheric CO2 concentrations (ppmv) derived from flask *** *** air samples collected at Cape Kumukahi, Hawaii *** *** *** *** 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 1979 -99.99 -99.99 338.86 339.75 -99.99 339.99 -99.99 -99.99 333.64 334.67 -99.99 337.97 -99.99 -99.99 1980 -99.99 340.64 340.65 342.82 343.33 341.57 337.85 336.65 335.10 336.27 338.01 339.09 (339.27) 339.10 1981 339.80 340.99 342.80 342.61 -99.99 -99.99 338.15 336.90 336.45 337.76 339.02 341.46 (340.17) 340.27 1982 342.13 341.84 343.48 344.32 345.02 343.79 340.76 338.33 -99.99 337.52 340.02 341.31 (341.30) 341.32 1983 341.98 343.67 344.96 345.41 346.24 344.98 342.45 339.64 338.52 340.39 342.48 343.79 342.88 342.84 1984 344.65 345.70 345.97 348.18 348.06 346.84 344.08 341.26 340.28 341.73 343.02 344.61 344.53 344.58 1985 346.27 346.37 347.83 348.45 350.10 348.88 345.90 342.85 341.09 343.09 344.40 346.41 345.97 345.91 1986 347.06 348.16 348.57 350.00 350.45 350.16 347.28 344.68 343.85 344.83 346.69 347.89 347.47 347.45 1987 349.23 349.35 350.83 351.73 352.34 352.24 348.91 346.55 345.13 346.76 348.36 350.07 349.29 349.33 1988 351.03 352.11 352.99 354.57 355.08 354.13 351.67 349.41 347.42 349.24 350.85 351.70 351.68 351.67 1989 353.44 353.17 354.18 356.18 356.86 355.86 352.75 349.63 349.09 350.01 351.84 354.06 353.09 353.14 1990 354.49 356.59 356.81 357.37 357.73 356.95 354.69 352.74 350.88 351.86 353.76 355.07 354.91 354.87 1991 356.00 356.97 358.13 358.98 360.26 358.15 355.64 353.25 351.34 353.04 354.58 355.54 355.99 356.04 1992 357.16 358.49 359.07 360.06 360.34 358.87 354.19 354.07 352.28 353.39 355.11 356.97 356.67 356.73 1993 357.69 359.17 358.96 360.24 361.49 359.92 356.65 354.22 352.70 354.42 356.08 358.43 357.50 357.53 1994 359.43 360.52 361.48 361.84 362.52 361.32 358.37 356.46 354.77 356.23 358.64 360.96 359.38 359.30 1995 360.82 362.81 362.77 364.46 364.26 362.88 360.45 357.73 357.53 359.24 359.77 361.23 361.16 361.18 1996 362.60 364.12 364.47 365.13 365.61 366.66 362.66 360.14 358.62 360.02 361.94 363.66 362.97 362.90 1997 364.33 365.52 365.48 366.83 368.43 366.74 362.92 361.63 359.63 360.58 362.95 366.22 364.27 364.34 1998 366.31 368.26 369.19 369.59 369.84 368.31 366.21 364.30 361.30 364.67 366.16 367.74 366.82 366.92 1999 369.72 369.88 370.68 372.00 372.03 370.56 367.45 364.46 362.94 364.95 367.36 369.18 368.43 368.44 2000 369.97 371.12 372.55 373.18 373.42 373.20 368.74 366.62 366.45 366.90 369.06 370.39 370.13 370.12 2001 371.90 372.85 375.04 374.23 375.36 373.61 371.10 367.94 367.29 368.45 370.68 372.01 371.70 371.64 2002 372.70 374.70 375.41 376.40 376.79 374.63 372.84 370.24 367.89 370.74 372.32 375.10 373.31 373.40 2003 375.67 377.71 377.73 378.38 379.17 379.17 375.84 371.45 371.25 373.24 375.74 376.42 375.98 375.98 2004 377.84 378.76 379.20 381.27 380.99 380.61 377.49 374.05 374.71 375.52 376.89 378.44 377.98 377.93 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.