# -------------------------------------------------------------------- # USE OF NOAA GML DATA # # These data are made freely available to the public and the scientific # community in the belief that their wide dissemination will lead to # greater understanding and new scientific insights. To ensure that GML # receives fair credit for their work please include relevant citation # text in publications. We encourage users to contact the data providers, # who can provide detailed information about the measurements and # scientific insight. In cases where the data are central to a # publication, coauthorship for data providers may be appropriate. # # # # Contact: Xin Lan (xin.lan@noaa.gov) # # File Creation: Fri Apr 5 03:55:14 2024 # # # -------------------------------------------------------------------- # # # See gml.noaa.gov/ccgg/trends/ for additional details. # # Annual CO2 mole fraction increase (ppm) from Jan 1 through Dec 31. # # The uncertainty in the global annual mean growth rate is estimated using a # monte carlo technique that computes 200 time series of global annual growth # rates, each time using measurement records from a different sampling of sites # from the NOAA GML cooperative air sampling network. Each year has a different # uncertainty. Please see Conway et al., 1994, JGR, vol. 99, no. D11. for a # complete discussion. The last one or two years listed could have preliminary # uncertainties set equal to the average uncertainty since 1980. # Before 1980 the global growth rate has been approximated by taking the average # of Mauna Loa and the South Pole, correcting for the offset between (MLO+SPO)/2 # and the global Marine Boundary Layer, as described in Ballantyne et al, 2012 # # CO2 expressed as a mole fraction in dry air, micromol/mol, abbreviated as ppm # # NOTE: In general, the data presented for the last year are subject to change, # depending on recalibration of the reference gas mixtures used, and other quality # control procedures. Occasionally, earlier years may also be changed for the same # reasons. Usually these changes are minor. # # year ann inc unc 1959 0.96 0.31 1960 0.71 0.27 1961 0.78 0.27 1962 0.56 0.27 1963 0.57 0.28 1964 0.49 0.27 1965 1.10 0.26 1966 1.10 0.28 1967 0.61 0.34 1968 0.99 0.32 1969 1.32 0.29 1970 1.13 0.32 1971 0.73 0.30 1972 1.47 0.31 1973 1.46 0.31 1974 0.68 0.31 1975 1.23 0.27 1976 0.97 0.28 1977 1.92 0.29 1978 1.29 0.24 1979 2.14 0.26 1980 1.71 0.10 1981 1.15 0.05 1982 1.00 0.08 1983 1.83 0.09 1984 1.23 0.11 1985 1.65 0.08 1986 1.02 0.10 1987 2.65 0.09 1988 2.16 0.10 1989 1.46 0.09 1990 1.22 0.07 1991 0.75 0.10 1992 0.72 0.09 1993 1.23 0.07 1994 1.66 0.11 1995 2.00 0.10 1996 1.05 0.08 1997 1.97 0.09 1998 2.84 0.13 1999 1.33 0.09 2000 1.25 0.11 2001 1.85 0.10 2002 2.38 0.07 2003 2.28 0.10 2004 1.55 0.05 2005 2.46 0.07 2006 1.77 0.07 2007 2.12 0.07 2008 1.78 0.05 2009 1.58 0.06 2010 2.41 0.06 2011 1.68 0.07 2012 2.41 0.06 2013 2.45 0.06 2014 2.04 0.07 2015 2.96 0.08 2016 2.83 0.08 2017 2.13 0.09 2018 2.39 0.09 2019 2.50 0.06 2020 2.31 0.08 2021 2.46 0.08 2022 2.16 0.08 2023 2.81 0.08