******************************************************************** *** Atmospheric CO2-curve values (ppmv) derived from flask air *** *** samples collected at Baring Head, New Zealand *** *** *** *** Source: R. F. Keeling, S. C. Piper, A. F. Bollenbacher *** *** and S. J. Walker *** *** Carbon Dioxide Research Group *** *** Scripps Institution of Oceanography (SIO) *** *** University of California *** *** La Jolla, California USA 92093-0444 *** *** *** *** May 2008 *** ******************************************************************** Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann. Ave. 1977 332.99 333.01 332.79 332.85 332.96 1978 332.90 333.09 333.33 333.41 333.71 334.21 334.56 334.85 334.80 334.52 334.52 334.57 334.04 1979 334.46 334.62 334.83 334.88 335.16 335.61 335.92 336.16 336.07 335.74 335.71 335.76 335.41 1980 335.67 335.87 336.13 336.25 336.60 337.13 337.50 337.79 337.74 337.44 337.44 337.48 336.92 1981 337.35 337.51 337.72 337.77 338.05 338.50 338.80 339.02 338.91 338.56 338.51 338.52 338.27 1982 338.37 338.52 338.73 338.78 339.07 339.56 339.89 340.17 340.12 339.84 339.85 339.92 339.40 1983 339.83 340.02 340.26 340.35 340.66 341.15 341.49 341.76 341.69 341.38 341.35 341.38 340.94 1984 341.24 341.38 341.58 341.63 341.91 342.38 342.70 342.95 342.87 342.56 342.54 342.57 342.19 1985 342.44 342.60 342.82 342.88 343.17 343.66 343.99 344.26 344.20 343.91 343.91 343.96 343.48 1986 343.87 344.05 344.29 344.37 344.68 345.16 345.50 345.78 345.74 345.47 345.50 345.59 345.00 1987 345.52 345.74 346.00 346.11 346.45 346.98 347.36 347.68 347.68 347.44 347.49 347.59 346.84 1988 347.54 347.75 348.01 348.11 348.44 348.94 349.29 349.58 349.53 349.26 349.28 349.35 348.76 1989 349.27 349.47 349.71 349.80 350.10 350.58 350.90 351.16 351.08 350.75 350.72 350.73 350.36 1990 350.58 350.71 350.91 350.96 351.26 351.75 352.09 352.37 352.33 352.03 352.03 352.07 351.59 1991 351.95 352.11 352.31 352.37 352.64 353.08 353.37 353.59 353.48 353.13 353.09 353.11 352.85 1992 352.99 353.16 353.40 353.50 353.82 354.31 354.64 354.89 354.78 354.42 354.34 354.31 354.05 1993 354.12 354.23 354.40 354.43 354.69 355.14 355.45 355.70 355.63 355.33 355.32 355.37 354.98 1994 355.27 355.46 355.71 355.81 356.13 356.63 356.99 357.27 357.22 356.92 356.89 356.92 356.44 1995 356.79 356.95 357.18 357.27 357.59 358.12 358.51 358.84 358.84 358.60 358.66 358.76 358.01 1996 358.70 358.90 359.14 359.21 359.50 359.95 360.24 360.46 360.35 360.01 359.97 359.99 359.70 1997 359.86 360.02 360.25 360.34 360.67 361.21 361.61 361.97 362.00 361.80 361.90 362.06 361.14 1998 362.06 362.34 362.65 362.82 363.21 363.78 364.19 364.53 364.54 364.29 364.32 364.39 363.59 1999 364.30 364.48 364.70 364.77 365.08 365.57 365.92 366.20 366.15 365.85 365.83 365.85 365.39 2000 365.71 365.85 366.04 366.07 366.34 366.79 367.10 367.34 367.27 366.97 366.96 367.02 366.62 2001 366.92 367.12 367.36 367.47 367.81 368.34 368.72 369.04 369.05 368.81 368.88 369.00 368.21 2002 368.98 369.24 369.55 369.72 370.12 370.72 371.16 371.53 371.58 371.38 371.47 371.60 370.59 2003 371.55 371.82 372.10 372.26 372.72 373.28 373.50 373.40 373.78 373.40 373.53 373.61 372.91 2004 373.52 373.72 373.96 374.04 374.35 374.83 375.15 375.40 375.33 375.03 375.03 375.09 374.62 2005 375.01 375.23 375.50 375.65 376.03 376.61 377.04 377.41 377.43 377.21 377.26 377.37 376.48 2006 377.30 377.52 377.78 377.88 378.21 378.72 379.08 379.37 379.34 379.07 379.10 379.18 378.55 2007 379.11 379.33 379.59 379.71 380.05 380.57 380.95 381.27 381.27 381.03 381.09 381.21 380.43 Values above are taken from a curve consisting of 4 harmonics plus a stiff spline and a linear gain factor, fit to monthly concentration values adjusted to represent 2400 hours on the 15th day of each month. Data used to derive this curve are shown in the accompanying graph. Units are parts per million by volume (ppmv) expressed in the 2003A SIO manometric mole fraction scale. The "annual average" is the arithmetic mean of the twelve monthly values.