Data Set of Monthly CO2 Concentrations

This data set contains selected monthly mean CO2 concentrations at the Mauna Loa Observatory from 1974 to 1987. The CO2 concentrations were measured by the continuous infrared analyser of the Geophysical Monitoring for Climatic Change division of NOAA’s Air Resources Laboratory. The selection has been for an approximation of ‘background conditions’. See Thoning et al., “Atmospheric Carbon Dioxide at Mauna Loa Observatory: II Analysis of the NOAA/GMCC Data 1974-1985”, Journal of Geophysical Research (submitted) for details.

This dataset was received from Jim Elkins of NOAA in 1988.

Each line contains the CO2 concentration (mixing ratio in dry air, expressed in the WMO X85 mole fraction scale, maintained by the Scripps Institution of Oceanography). In addition, it contains the year, month, and a numeric value for the combined month and year. This combined date is useful for plotting purposes.

CO2 Year&Month Year Month
————————————————–
333.13 1974.38 1974 5
332.09 1974.46 1974 6
331.10 1974.54 1974 7
329.14 1974.63 1974 8
327.36 1974.71 1974 9
327.29 1974.79 1974 10
328.23 1974.88 1974 11
329.55 1974.96 1974 12

330.62 1975.04 1975 1
331.40 1975.13 1975 2
331.87 1975.21 1975 3
333.18 1975.29 1975 4
333.92 1975.38 1975 5
333.43 1975.46 1975 6
331.85 1975.54 1975 7
330.01 1975.63 1975 8
328.51 1975.71 1975 9
328.41 1975.79 1975 10
329.25 1975.88 1975 11
330.97 1975.96 1975 12

331.60 1976.04 1976 1
332.60 1976.13 1976 2
333.57 1976.21 1976 3
334.72 1976.29 1976 4
334.68 1976.38 1976 5
334.17 1976.46 1976 6
332.96 1976.54 1976 7
330.80 1976.63 1976 8
328.98 1976.71 1976 9
328.57 1976.79 1976 10
330.20 1976.88 1976 11
331.58 1976.96 1976 12

332.67 1977.04 1977 1
333.17 1977.13 1977 2
334.86 1977.21 1977 3
336.07 1977.29 1977 4
336.82 1977.38 1977 5
336.12 1977.46 1977 6
334.81 1977.54 1977 7
332.56 1977.63 1977 8
331.30 1977.71 1977 9
331.22 1977.79 1977 10
332.37 1977.88 1977 11
333.49 1977.96 1977 12

334.71 1978.04 1978 1
335.23 1978.13 1978 2
336.54 1978.21 1978 3
337.79 1978.29 1978 4
337.95 1978.38 1978 5
338.00 1978.46 1978 6
336.37 1978.54 1978 7
334.47 1978.63 1978 8
332.46 1978.71 1978 9
332.29 1978.79 1978 10
333.76 1978.88 1978 11
334.80 1978.96 1978 12

336.00 1979.04 1979 1
336.63 1979.13 1979 2
337.93 1979.21 1979 3
338.95 1979.29 1979 4
339.05 1979.38 1979 5
339.27 1979.46 1979 6
337.64 1979.54 1979 7
335.68 1979.63 1979 8
333.77 1979.71 1979 9
334.09 1979.79 1979 10
335.29 1979.88 1979 11
336.76 1979.96 1979 12

337.77 1980.04 1980 1
338.26 1980.13 1980 2
340.10 1980.21 1980 3
340.88 1980.29 1980 4
341.47 1980.38 1980 5
341.31 1980.46 1980 6
339.41 1980.54 1980 7
337.74 1980.63 1980 8
336.07 1980.71 1980 9
336.07 1980.79 1980 10
337.22 1980.88 1980 11
338.38 1980.96 1980 12

339.32 1981.04 1981 1
340.41 1981.13 1981 2
341.69 1981.21 1981 3
342.51 1981.29 1981 4
343.02 1981.38 1981 5
342.54 1981.46 1981 6
340.88 1981.54 1981 7
338.75 1981.63 1981 8
337.05 1981.71 1981 9
337.13 1981.79 1981 10
338.45 1981.88 1981 11
339.85 1981.96 1981 12

340.90 1982.04 1982 1
341.70 1982.13 1982 2
342.70 1982.21 1982 3
343.65 1982.29 1982 4
344.28 1982.38 1982 5
343.42 1982.46 1982 6
342.02 1982.54 1982 7
339.97 1982.63 1982 8
337.84 1982.71 1982 9
338.00 1982.79 1982 10
339.20 1982.88 1982 11
340.63 1982.96 1982 12

341.41 1983.04 1983 1
342.68 1983.13 1983 2
343.04 1983.21 1983 3
345.27 1983.29 1983 4
345.92 1983.38 1983 5
345.40 1983.46 1983 6
344.16 1983.54 1983 7
342.11 1983.63 1983 8
340.11 1983.71 1983 9
340.15 1983.79 1983 10
341.38 1983.88 1983 11
343.02 1983.96 1983 12

343.87 1984.04 1984 1
344.59 1984.13 1984 2
345.11 1984.21 1984 3
347.07 1984.29 1984 4
347.38 1984.38 1984 5
346.78 1984.46 1984 6
344.96 1984.54 1984 7
342.71 1984.63 1984 8
340.86 1984.71 1984 9
341.13 1984.79 1984 10
342.84 1984.88 1984 11
344.32 1984.96 1984 12

344.88 1985.04 1985 1
345.62 1985.13 1985 2
347.23 1985.21 1985 3
347.62 1985.29 1985 4
348.53 1985.38 1985 5
347.87 1985.46 1985 6
346.00 1985.54 1985 7
343.86 1985.63 1985 8
342.55 1985.71 1985 9
342.57 1985.79 1985 10
344.11 1985.88 1985 11
345.49 1985.96 1985 12

346.04 1986.04 1986 1
346.70 1986.13 1986 2
347.38 1986.21 1986 3
349.38 1986.29 1986 4
349.93 1986.38 1986 5
349.26 1986.46 1986 6
347.44 1986.54 1986 7
345.55 1986.63 1986 8
344.21 1986.71 1986 9
343.67 1986.79 1986 10
345.09 1986.88 1986 11
346.27 1986.96 1986 12

347.33 1987.04 1987 1
347.82 1987.13 1987 2
349.29 1987.21 1987 3
350.91 1987.29 1987 4
351.71 1987.38 1987 5
350.94 1987.46 1987 6
349.10 1987.54 1987 7
346.77 1987.63 1987 8
345.73 1987.71 1987 9