************************************************************************************* *** Monthly and annual filtered atmospheric CO2 concentrations from in situ *** *** measurements at Mt. Cimone, Italy *** *** *** *** January 1998 *** *** *** *** Source: Tiziano Colombo *** *** Riccardo Santaguida *** *** Italian Meteorological Service *** *** Via delle Ville *** *** 100-41029 Sestola (MO), Italy *** *** *** *** Atmospheric CO2 concentrations are expressed in parts per million by volume *** *** (ppmv) according to the WMO/Scripps 1993 mole fraction scale. Annual averages *** *** are based on monthly means. Missing values are denoted by -99.99. *** ************************************************************************************* Year Jan. Feb. March April May June July August Sept. Oct. Nov. Dec. Annual 1979 -99.99 -99.99 341.60 342.83 337.97 337.00 333.06 329.29 329.66 333.71 335.48 337.63 335.82 1980 340.26 338.13 341.58 342.35 338.65 336.40 331.98 330.60 332.90 335.24 338.74 339.46 336.79 1981 341.02 342.62 342.61 342.33 340.92 337.88 333.51 333.22 334.53 336.85 339.62 342.49 338.97 1982 341.28 343.99 345.70 346.15 341.90 339.66 337.82 335.93 335.98 339.16 340.74 344.50 341.07 1983 342.15 346.24 344.37 344.62 343.24 340.75 339.35 337.20 338.04 340.08 344.05 345.62 342.14 1984 345.86 348.95 350.17 350.42 346.69 344.90 338.11 337.12 338.61 341.78 344.59 345.46 344.39 1985 348.93 347.64 350.53 350.53 347.31 344.77 341.22 338.96 340.40 343.89 348.50 347.34 345.84 1986 349.69 349.94 351.60 351.84 349.80 345.52 342.33 341.27 342.25 346.02 348.71 350.08 347.42 1987 350.33 352.32 354.70 353.02 351.30 349.02 345.47 343.80 344.17 345.84 349.83 351.80 349.30 1988 353.51 355.16 355.50 355.27 354.08 350.56 346.73 347.17 346.23 349.48 353.21 354.73 351.80 1989 354.08 354.62 356.35 358.30 354.19 352.12 350.77 348.89 349.54 351.65 354.18 355.63 353.36 1990 355.84 356.46 358.50 359.32 354.95 354.18 351.74 348.50 349.76 352.49 356.04 357.73 354.62 1991 357.41 360.78 360.39 360.84 358.45 356.11 352.20 350.34 352.62 353.89 356.95 359.29 356.60 1992 357.89 359.59 361.15 360.17 358.02 355.90 350.02 350.46 350.94 354.95 356.10 357.90 356.09 1993 359.08 361.32 362.47 361.53 359.76 356.85 353.79 352.70 351.50 355.46 360.75 359.66 357.91 1994 360.56 361.94 361.53 364.15 362.38 358.80 353.66 354.15 354.19 357.20 359.32 361.71 359.13 1995 364.25 363.15 364.96 364.75 362.75 358.04 356.56 351.93 355.85 358.62 362.26 364.95 360.67 1996 365.23 369.22 368.01 367.81 365.81 361.83 359.13 357.10 356.73 361.13 363.13 365.21 363.36 1997 365.97 366.98 367.53 368.10 366.10 364.59 359.61 358.74 358.58 362.34 365.57 368.02 364.34