#******************************************************************* #*** Atmospheric CO2 concentrations (ppmv) derived from in situ *** #*** air samples collected at Mauna Loa Observatory, 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 *** #*** *** #******************************************************************* #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. 1958 -99.99 1958.08 -99.99 1958.15 315.71 1958.23 317.45 1958.31 317.50 1958.38 317.50 1958.46 -99.99 1958.54 315.86 1958.61 314.93 1958.69 313.19 1958.77 -99.99 1958.85 313.34 1958.92 314.67 1959 315.58 1959.08 316.47 1959.15 316.65 1959.23 317.71 1959.31 318.29 1959.38 318.29 1959.46 318.16 1959.54 316.55 1959.61 314.80 1959.69 313.84 1959.77 313.34 1959.85 314.81 1959.92 315.59 1960 316.43 1960.08 316.97 1960.15 317.58 1960.23 319.03 1960.31 320.03 1960.38 320.03 1960.46 319.59 1960.54 318.18 1960.61 315.91 1960.69 314.16 1960.77 313.83 1960.85 315.00 1960.92 316.19 1961 316.89 1961.08 317.70 1961.15 318.54 1961.23 319.48 1961.31 320.58 1961.38 320.58 1961.46 319.78 1961.54 318.58 1961.61 316.79 1961.69 314.99 1961.77 315.31 1961.85 316.10 1961.92 317.01 1962 317.94 1962.08 318.56 1962.15 319.69 1962.23 320.58 1962.31 321.01 1962.38 321.01 1962.46 320.61 1962.54 319.61 1962.61 317.40 1962.69 316.26 1962.77 315.42 1962.85 316.69 1962.92 317.69 1963 318.74 1963.08 319.08 1963.15 319.86 1963.23 321.39 1963.31 322.24 1963.38 322.24 1963.46 321.47 1963.54 319.74 1963.61 317.77 1963.69 316.21 1963.77 315.99 1963.85 317.07 1963.92 318.36 1964 319.57 1964.08 -99.99 1964.15 -99.99 1964.23 -99.99 1964.31 322.23 1964.38 322.23 1964.46 321.89 1964.54 320.44 1964.61 318.70 1964.69 316.70 1964.77 316.87 1964.85 317.68 1964.92 318.71 1965 319.44 1965.08 320.44 1965.15 320.89 1965.23 322.13 1965.31 322.16 1965.38 322.16 1965.46 321.87 1965.54 321.21 1965.61 318.87 1965.69 317.81 1965.77 317.30 1965.85 318.87 1965.92 319.42 1966 320.62 1966.08 321.59 1966.15 322.39 1966.23 323.70 1966.31 324.07 1966.38 324.07 1966.46 323.75 1966.54 322.40 1966.61 320.37 1966.69 318.64 1966.77 318.10 1966.85 319.79 1966.92 321.03 1967 322.33 1967.08 322.50 1967.15 323.04 1967.23 324.42 1967.31 325.00 1967.38 325.00 1967.46 324.09 1967.54 322.55 1967.61 320.92 1967.69 319.26 1967.77 319.39 1967.85 320.72 1967.92 321.96 1968 322.57 1968.08 323.15 1968.15 323.89 1968.23 325.02 1968.31 325.57 1968.38 325.57 1968.46 325.36 1968.54 324.14 1968.61 322.11 1968.69 320.33 1968.77 320.25 1968.85 321.32 1968.92 322.90 1969 324.00 1969.08 324.42 1969.15 325.64 1969.23 326.66 1969.31 327.38 1969.38 327.38 1969.46 326.70 1969.54 325.89 1969.61 323.67 1969.69 322.38 1969.77 321.78 1969.85 322.85 1969.92 324.12 1970 325.06 1970.08 325.98 1970.15 326.93 1970.23 328.13 1970.31 328.07 1970.38 328.07 1970.46 327.66 1970.54 326.35 1970.61 324.69 1970.69 323.10 1970.77 323.07 1970.85 324.01 1970.92 325.13 1971 326.17 1971.08 326.68 1971.15 327.18 1971.23 327.78 1971.31 328.92 1971.38 328.92 1971.46 328.57 1971.54 327.37 1971.61 325.43 1971.69 323.36 1971.77 323.56 1971.85 324.80 1971.92 326.01 1972 326.77 1972.08 327.63 1972.15 327.75 1972.23 329.72 1972.31 330.07 1972.38 330.07 1972.46 329.09 1972.54 328.05 1972.61 326.32 1972.69 324.84 1972.77 325.20 1972.85 326.50 1972.92 327.55 1973 328.54 1973.08 329.56 1973.15 330.30 1973.23 331.50 1973.31 332.48 1973.38 332.48 1973.46 332.07 1973.54 330.87 1973.61 329.31 1973.69 327.51 1973.77 327.18 1973.85 328.16 1973.92 328.64 1974 329.35 1974.08 330.71 1974.15 331.48 1974.23 332.65 1974.31 333.09 1974.38 333.09 1974.46 332.25 1974.54 331.18 1974.61 329.40 1974.69 327.44 1974.77 327.37 1974.85 328.46 1974.92 329.58 1975 330.40 1975.08 331.41 1975.15 332.04 1975.23 333.31 1975.31 333.96 1975.38 333.96 1975.46 333.59 1975.54 331.91 1975.61 330.06 1975.69 328.56 1975.77 328.34 1975.85 329.49 1975.92 330.76 1976 331.74 1976.08 332.56 1976.15 333.50 1976.23 334.58 1976.31 334.87 1976.38 334.87 1976.46 334.34 1976.54 333.05 1976.61 330.94 1976.69 329.30 1976.77 328.94 1976.85 330.31 1976.92 331.68 1977 332.92 1977.08 333.42 1977.15 334.70 1977.23 336.07 1977.31 336.74 1977.38 336.74 1977.46 336.27 1977.54 334.93 1977.61 332.75 1977.69 331.58 1977.77 331.16 1977.85 332.40 1977.92 333.85 1978 334.97 1978.08 335.39 1978.15 336.64 1978.23 337.76 1978.31 338.01 1978.38 338.01 1978.46 337.89 1978.54 336.54 1978.61 334.68 1978.69 332.76 1978.77 332.54 1978.85 333.92 1978.92 334.95 1979 336.23 1979.08 336.76 1979.15 337.96 1979.23 338.89 1979.31 339.47 1979.38 339.47 1979.46 339.29 1979.54 337.73 1979.61 336.09 1979.69 333.91 1979.77 333.86 1979.85 335.29 1979.92 336.73 1980 338.01 1980.08 338.36 1980.15 340.08 1980.23 340.77 1980.31 341.46 1980.38 341.46 1980.46 341.17 1980.54 339.56 1980.61 337.60 1980.69 335.88 1980.77 336.01 1980.85 337.10 1980.92 338.21 1981 339.23 1981.08 340.47 1981.15 341.38 1981.23 342.51 1981.31 342.91 1981.38 342.91 1981.46 342.25 1981.54 340.49 1981.61 338.43 1981.69 336.69 1981.77 336.85 1981.85 338.36 1981.92 339.61 1982 340.75 1982.08 341.61 1982.15 342.70 1982.23 343.56 1982.31 344.13 1982.38 344.13 1982.46 343.35 1982.54 342.06 1982.61 339.82 1982.69 337.97 1982.77 337.86 1982.85 339.26 1982.92 340.49 1983 341.37 1983.08 342.52 1983.15 343.10 1983.23 344.94 1983.31 345.75 1983.38 345.75 1983.46 345.32 1983.54 343.99 1983.61 342.39 1983.69 339.86 1983.77 339.99 1983.85 341.16 1983.92 342.99 1984 343.70 1984.08 344.51 1984.15 345.28 1984.23 347.08 1984.31 347.43 1984.38 347.43 1984.46 346.79 1984.54 345.40 1984.61 343.28 1984.69 341.07 1984.77 341.35 1984.85 342.98 1984.92 344.22 1985 344.97 1985.08 346.00 1985.15 347.43 1985.23 348.35 1985.31 348.93 1985.38 348.93 1985.46 348.25 1985.54 346.56 1985.61 344.69 1985.69 343.09 1985.77 342.80 1985.85 344.24 1985.92 345.56 1986 346.29 1986.08 346.96 1986.15 347.86 1986.23 349.55 1986.31 350.21 1986.38 350.21 1986.46 349.54 1986.54 347.94 1986.61 345.91 1986.69 344.86 1986.77 344.17 1986.85 345.66 1986.92 346.90 1987 348.02 1987.08 348.47 1987.15 349.42 1987.23 350.99 1987.31 351.84 1987.38 351.84 1987.46 351.25 1987.54 349.52 1987.61 348.10 1987.69 346.44 1987.77 346.36 1987.85 347.81 1987.92 348.96 1988 350.43 1988.08 351.72 1988.15 352.22 1988.23 353.59 1988.31 354.22 1988.38 354.22 1988.46 353.79 1988.54 352.39 1988.61 350.44 1988.69 348.72 1988.77 348.88 1988.85 350.07 1988.92 351.34 1989 352.76 1989.08 353.07 1989.15 353.68 1989.23 355.42 1989.31 355.67 1989.38 355.67 1989.46 355.13 1989.54 353.90 1989.61 351.67 1989.69 349.80 1989.77 349.99 1989.85 351.30 1989.92 352.53 1990 353.66 1990.08 354.70 1990.15 355.39 1990.23 356.20 1990.31 357.16 1990.38 357.16 1990.46 356.22 1990.54 354.82 1990.61 352.91 1990.69 350.96 1990.77 351.18 1990.85 352.83 1990.92 354.21 1991 354.72 1991.08 355.75 1991.15 357.16 1991.23 358.60 1991.31 359.34 1991.38 359.34 1991.46 358.24 1991.54 356.17 1991.61 354.03 1991.69 352.16 1991.77 352.21 1991.85 353.75 1991.92 354.99 1992 355.98 1992.08 356.72 1992.15 357.81 1992.23 359.15 1992.31 359.66 1992.38 359.66 1992.46 359.25 1992.54 357.03 1992.61 355.00 1992.69 353.01 1992.77 353.31 1992.85 354.16 1992.92 355.40 1993 356.70 1993.08 357.16 1993.15 358.38 1993.23 359.46 1993.31 360.28 1993.38 360.28 1993.46 359.60 1993.54 357.57 1993.61 355.52 1993.69 353.70 1993.77 353.98 1993.85 355.33 1993.92 356.80 1994 358.36 1994.08 358.91 1994.15 359.97 1994.23 361.26 1994.31 361.68 1994.38 361.68 1994.46 360.95 1994.54 359.55 1994.61 357.49 1994.69 355.84 1994.77 355.99 1994.85 357.58 1994.92 359.04 1995 359.96 1995.08 361.00 1995.15 361.64 1995.23 363.45 1995.31 363.79 1995.38 363.79 1995.46 363.26 1995.54 361.90 1995.61 359.46 1995.69 358.06 1995.77 357.75 1995.85 359.56 1995.92 360.70 1996 362.05 1996.08 363.25 1996.15 364.03 1996.23 364.72 1996.31 365.41 1996.38 365.41 1996.46 364.97 1996.54 363.65 1996.61 361.49 1996.69 359.46 1996.77 359.60 1996.85 360.76 1996.92 362.33 1997 363.18 1997.08 364.00 1997.15 364.57 1997.23 366.35 1997.31 366.79 1997.38 366.79 1997.46 365.62 1997.54 364.47 1997.61 362.51 1997.69 360.19 1997.77 360.77 1997.85 362.43 1997.92 364.28 1998 365.32 1998.08 366.15 1998.15 367.31 1998.23 368.61 1998.31 369.29 1998.38 369.29 1998.46 368.87 1998.54 367.64 1998.61 365.77 1998.69 363.90 1998.77 364.23 1998.85 365.46 1998.92 366.97 1999 368.15 1999.08 368.87 1999.15 369.59 1999.23 371.14 1999.31 371.00 1999.38 371.00 1999.46 370.35 1999.54 369.27 1999.61 366.94 1999.69 364.63 1999.77 365.12 1999.85 366.67 1999.92 368.01 2000 369.14 2000.08 369.46 2000.15 370.52 2000.23 371.66 2000.31 371.82 2000.38 371.82 2000.46 371.70 2000.54 370.12 2000.61 368.12 2000.69 366.62 2000.77 366.73 2000.85 368.29 2000.92 369.53 2001 370.28 2001.08 371.50 2001.15 372.12 2001.23 372.87 2001.31 374.02 2001.38 374.02 2001.46 373.30 2001.54 371.62 2001.61 369.55 2001.69 367.96 2001.77 368.09 2001.85 369.68 2001.92 371.24 2002 372.43 2002.08 373.09 2002.15 373.52 2002.23 374.86 2002.31 375.55 2002.38 375.55 2002.46 375.40 2002.54 374.02 2002.61 371.49 2002.69 370.71 2002.77 370.24 2002.85 372.08 2002.92 373.78 2003 374.68 2003.08 375.63 2003.15 376.11 2003.23 377.65 2003.31 378.35 2003.38 378.35 2003.46 378.13 2003.54 376.62 2003.61 374.50 2003.69 372.99 2003.77 373.00 2003.85 374.35 2003.92 375.70 2004 376.79 2004.08 377.37 2004.15 378.41 2004.23 380.52 2004.31 380.63 2004.38 380.63 2004.46 379.57 2004.54 377.79 2004.61 375.86 2004.69 374.06 2004.77 374.24 2004.85 375.86 2004.92 377.48