********************************************************************* *** Atmospheric Carbon Dioxide Mixing Ratios from the *** *** NOAA CMDL Carbon Cycle Cooperative Global Air Sampling *** *** Network, 1968-2002 *** *** *** *** March 2005 *** *** *** *** Source: Thomas J. Conway *** *** Pieter P. Tans *** *** NOAA Climate Monitoring and Diagnostics Laboratory *** *** 325 Broadway *** *** Boulder, Colorado, U.S.A. *** ********************************************************************* Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ann 1978 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 333.88 336.56 338.28 -99.99 1979 340.06 340.83 341.69 342.92 342.57 338.61 332.41 327.95 331.19 336.81 339.05 339.76 337.82 1980 341.04 342.67 343.71 344.25 344.60 341.57 334.28 330.49 332.55 337.30 340.64 342.01 339.59 1981 343.75 344.90 345.57 346.28 345.24 341.85 335.51 331.00 333.56 339.48 342.48 343.92 341.13 1982 345.50 346.30 347.06 347.83 347.15 343.64 336.03 330.45 332.91 338.79 342.23 345.05 341.91 1983 346.59 346.24 346.29 347.21 347.05 343.72 336.65 332.79 337.10 343.45 345.68 346.06 343.24 1984 347.68 349.34 349.09 349.45 349.60 345.04 339.24 337.68 339.94 344.03 347.50 348.81 345.62 1985 348.86 349.64 351.40 352.33 351.90 349.06 343.98 338.02 338.86 344.45 347.56 349.08 347.10 1986 351.40 352.01 352.18 353.07 353.15 350.36 343.80 338.50 341.32 346.27 349.21 351.25 348.54 1987 352.20 352.60 353.62 354.89 354.89 351.85 345.18 339.45 341.46 348.70 352.58 353.57 350.08 1988 354.87 355.61 356.23 357.28 357.17 353.17 344.79 340.93 345.11 351.30 354.63 356.35 352.29 1989 357.62 358.14 359.34 360.66 359.57 355.69 347.97 342.77 346.34 352.20 355.54 358.30 354.51 1990 359.72 359.93 360.29 360.58 359.23 354.02 347.54 344.53 346.89 353.89 358.93 359.53 355.42 1991 359.43 360.59 361.78 363.03 362.47 357.30 351.06 348.89 349.81 354.27 359.39 360.88 357.41 1992 361.50 361.92 362.25 363.16 362.28 357.16 350.69 346.73 349.32 354.57 358.29 360.61 357.37 1993 361.70 362.07 362.32 362.78 362.06 358.10 353.22 348.76 349.89 355.64 358.98 360.20 357.98 1994 361.66 362.78 363.53 364.21 364.28 361.05 352.38 347.28 350.95 357.27 360.98 362.97 359.11 1995 364.52 364.69 365.24 366.63 365.96 362.22 354.89 351.03 354.79 359.80 362.55 364.45 361.40 1996 365.35 366.20 367.79 368.47 367.32 365.16 359.60 354.25 355.86 360.89 363.73 366.14 363.40 1997 367.52 368.35 369.82 370.69 369.95 365.95 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 1998 -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 1999 -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 2000 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 -99.99 374.00 -99.99 2001 375.62 376.40 377.08 378.26 377.28 371.76 364.72 361.23 363.88 369.84 373.69 375.63 372.12 2002 377.07 377.91 378.45 378.68 377.33 372.84 366.60 364.70 367.68 372.43 375.29 377.35 373.86 Monthly measurements are reported in parts per million (ppm) and are directly traceable to the WMO CO2 mole fraction scale. Annual values are the arithmetic means of the 12 monthly values.