******************************************************************* *** Atmospheric CO2 concentrations (ppmv) derived from flask *** *** air samples collected at Kermadec Islands, Raoul Island *** *** *** *** 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 1982 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 340.32 -99.99 -99.99 1983 -99.99 -99.99 -99.99 314.06 341.19 -99.99 341.57 -99.99 -99.99 341.74 342.21 342.13 -99.99 341.39 1984 -99.99 -99.99 342.35 343.13 -99.99 342.57 342.15 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 342.86 1985 -99.99 -99.99 -99.99 343.99 342.87 343.22 344.38 344.37 344.72 344.34 344.42 -99.99 -99.99 344.10 1986 -99.99 -99.99 -99.99 -99.99 345.01 344.93 -99.99 345.86 -99.99 346.19 -99.99 -99.99 -99.99 345.54 1987 346.42 -99.99 -99.99 346.64 347.14 -99.99 -99.99 347.39 348.02 348.58 348.71 -99.99 -99.99 347.57 1988 349.63 349.56 349.11 349.15 348.69 348.75 -99.99 349.42 349.89 -99.99 -99.99 -99.99 -99.99 349.52 1989 351.11 -99.99 350.26 350.18 -99.99 350.75 350.86 350.51 -99.99 351.38 -99.99 352.02 -99.99 350.86 1990 -99.99 -99.99 -99.99 351.25 351.80 352.59 -99.99 352.19 352.97 352.53 352.73 353.24 -99.99 352.26 1991 353.60 -99.99 -99.99 353.35 -99.99 352.79 353.60 353.68 353.64 -99.99 -99.99 354.81 -99.99 353.55 1992 354.16 354.00 -99.99 354.01 354.25 -99.99 354.93 355.05 354.98 -99.99 -99.99 355.35 -99.99 354.71 1993 -99.99 -99.99 355.13 -99.99 354.61 355.05 355.20 -99.99 355.68 356.46 356.66 356.69 -99.99 355.56 1994 -99.99 356.62 356.69 -99.99 -99.99 356.45 356.69 357.21 357.61 357.64 -99.99 -99.99 -99.99 357.08 1995 358.28 -99.99 -99.99 -99.99 358.62 -99.99 -99.99 359.09 -99.99 -99.99 -99.99 -99.99 -99.99 358.89 1996 -99.99 360.21 359.68 -99.99 359.51 -99.99 359.91 360.69 360.42 -99.99 360.91 361.81 -99.99 360.27 1997 361.35 -99.99 -99.99 361.27 360.79 361.55 -99.99 -99.99 362.01 362.22 -99.99 362.77 -99.99 361.82 1998 -99.99 -99.99 -99.99 363.70 364.05 -99.99 363.78 -99.99 364.41 -99.99 -99.99 -99.99 -99.99 364.23 1999 366.69 -99.99 365.67 365.82 -99.99 365.47 366.20 366.63 -99.99 -99.99 366.90 367.69 -99.99 366.29 2000 367.40 -99.99 366.75 -99.99 366.28 365.80 366.83 367.73 -99.99 367.90 368.44 -99.99 -99.99 367.19 2001 -99.99 -99.99 368.52 367.47 367.73 -99.99 369.52 -99.99 -99.99 369.05 369.54 -99.99 -99.99 368.78 2002 -99.99 -99.99 -99.99 -99.99 -99.99 371.15 371.31 371.21 372.57 371.98 372.45 -99.99 -99.99 371.34 2003 -99.99 373.12 -99.99 373.08 373.74 373.40 -99.99 -99.99 373.74 373.33 -99.99 -99.99 -99.99 373.58 2004 -99.99 375.29 -99.99 -99.99 -99.99 374.73 375.34 375.13 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 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.