# -------------------------------------------------------------------- # 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. # The availability of these data does not constitute publication # of the data. NOAA relies on the ethics and integrity of the user to # ensure that GML receives fair credit for their work. If the data # are obtained for potential use in a publication or presentation, # GML should be informed at the outset of the nature of this work. # If the GML data are essential to the work, or if an important # result or conclusion depends on the GML data, co-authorship # may be appropriate. This should be discussed at an early stage in # the work. Manuscripts using the GML data should be sent to GML # for review before they are submitted for publication so we can # ensure that the quality and limitations of the data are accurately # represented. # # Contact: Ed Dlugokencky (303 497 6228; ed.dlugokencky@noaa.gov) # # File Creation: Fri Nov 5 10:29:06 2021 # # RECIPROCITY # # Use of these data implies an agreement to reciprocate. # Laboratories making similar measurements agree to make their # own data available to the general public and to the scientific # community in an equally complete and easily accessible form. # Modelers are encouraged to make available to the community, # upon request, their own tools used in the interpretation # of the GML data, namely well documented model code, transport # fields, and additional information necessary for other # scientists to repeat the work and to run modified versions. # Model availability includes collaborative support for new # users of the models. # -------------------------------------------------------------------- # # # See www.esrl.noaa.gov/gmd/ccgg/trends/ for additional details. # # # The uncertainty in the global monthly mean is estimated using a # a monte carlo technique that computes 100 globally-averaged time # series, each time using a slightly different set of measurement # records from the NOAA ESRL cooperative air sampling network. The # reported uncertainty, 0.13 ppm, is the mean of the standard deviations # for each monthly mean using this technique. Please see Conway et al., # 1994, JGR, vol. 99, no. D11. for a complete discussion. Units are ppm. # # 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 month decimal average trend 1980 1 1980.042 338.55 337.93 1980 2 1980.125 339.27 338.22 1980 3 1980.208 339.60 338.25 1980 4 1980.292 340.00 338.37 1980 5 1980.375 340.43 338.90 1980 6 1980.458 339.99 339.20 1980 7 1980.542 338.44 339.30 1980 8 1980.625 337.21 339.49 1980 9 1980.708 337.05 339.45 1980 10 1980.792 337.82 339.16 1980 11 1980.875 338.93 339.26 1980 12 1980.958 339.64 339.40 1981 1 1981.042 340.19 339.55 1981 2 1981.125 340.75 339.70 1981 3 1981.208 341.38 340.03 1981 4 1981.292 341.68 340.06 1981 5 1981.375 341.43 339.89 1981 6 1981.458 340.62 339.84 1981 7 1981.542 339.23 340.08 1981 8 1981.625 338.08 340.36 1981 9 1981.708 337.97 340.36 1981 10 1981.792 339.07 340.42 1981 11 1981.875 340.18 340.50 1981 12 1981.958 340.75 340.51 1982 1 1982.042 341.37 340.76 1982 2 1982.125 341.95 340.89 1982 3 1982.208 342.23 340.85 1982 4 1982.292 342.52 340.90 1982 5 1982.375 342.36 340.82 1982 6 1982.458 341.49 340.72 1982 7 1982.542 339.75 340.61 1982 8 1982.625 338.11 340.40 1982 9 1982.708 338.16 340.54 1982 10 1982.792 339.62 340.96 1982 11 1982.875 340.95 341.28 1982 12 1982.958 341.77 341.52 1983 1 1983.042 342.37 341.71 1983 2 1983.125 342.74 341.71 1983 3 1983.208 343.04 341.70 1983 4 1983.292 343.51 341.93 1983 5 1983.375 343.84 342.31 1983 6 1983.458 343.50 342.70 1983 7 1983.542 342.14 342.91 1983 8 1983.625 340.62 342.84 1983 9 1983.708 340.53 342.94 1983 10 1983.792 341.75 343.16 1983 11 1983.875 342.83 343.18 1983 12 1983.958 343.49 343.27 1984 1 1984.042 344.32 343.66 1984 2 1984.125 344.82 343.82 1984 3 1984.208 344.96 343.60 1984 4 1984.292 345.19 343.56 1984 5 1984.375 345.33 343.78 1984 6 1984.458 344.57 343.80 1984 7 1984.542 343.20 344.02 1984 8 1984.625 342.21 344.50 1984 9 1984.708 342.13 344.58 1984 10 1984.792 342.99 344.37 1984 11 1984.875 344.16 344.47 1984 12 1984.958 345.00 344.71 1985 1 1985.042 345.36 344.66 1985 2 1985.125 345.80 344.78 1985 3 1985.208 346.64 345.32 1985 4 1985.292 346.94 345.33 1985 5 1985.375 346.77 345.20 1985 6 1985.458 346.26 345.47 1985 7 1985.542 344.92 345.75 1985 8 1985.625 343.41 345.73 1985 9 1985.708 343.37 345.82 1985 10 1985.792 344.64 346.03 1985 11 1985.875 345.79 346.11 1985 12 1985.958 346.55 346.25 1986 1 1986.042 347.11 346.43 1986 2 1986.125 347.34 346.34 1986 3 1986.208 347.71 346.38 1986 4 1986.292 348.22 346.61 1986 5 1986.375 348.32 346.75 1986 6 1986.458 347.76 346.99 1986 7 1986.542 346.30 347.15 1986 8 1986.625 344.92 347.22 1986 9 1986.708 344.86 347.26 1986 10 1986.792 346.04 347.40 1986 11 1986.875 347.30 347.63 1986 12 1986.958 347.76 347.46 1987 1 1987.042 348.02 347.24 1987 2 1987.125 348.57 347.48 1987 3 1987.208 349.29 347.87 1987 4 1987.292 349.98 348.30 1987 5 1987.375 350.26 348.69 1987 6 1987.458 349.48 348.81 1987 7 1987.542 347.86 348.85 1987 8 1987.625 346.61 349.00 1987 9 1987.708 346.70 349.15 1987 10 1987.792 347.97 349.36 1987 11 1987.875 349.25 349.57 1987 12 1987.958 350.21 349.89 1988 1 1988.042 350.91 350.12 1988 2 1988.125 351.47 350.38 1988 3 1988.208 351.85 350.38 1988 4 1988.292 352.30 350.52 1988 5 1988.375 352.46 350.83 1988 6 1988.458 351.76 351.06 1988 7 1988.542 350.28 351.27 1988 8 1988.625 349.10 351.55 1988 9 1988.708 349.27 351.79 1988 10 1988.792 350.44 351.86 1988 11 1988.875 351.61 351.96 1988 12 1988.958 352.46 352.18 1989 1 1989.042 353.00 352.17 1989 2 1989.125 353.46 352.34 1989 3 1989.208 354.00 352.57 1989 4 1989.292 354.38 352.60 1989 5 1989.375 354.19 352.51 1989 6 1989.458 353.26 352.56 1989 7 1989.542 351.56 352.59 1989 8 1989.625 350.21 352.70 1989 9 1989.708 350.56 353.09 1989 10 1989.792 351.85 353.28 1989 11 1989.875 353.03 353.38 1989 12 1989.958 353.90 353.59 1990 1 1990.042 354.46 353.71 1990 2 1990.125 354.87 353.80 1990 3 1990.208 355.19 353.77 1990 4 1990.292 355.50 353.73 1990 5 1990.375 355.40 353.73 1990 6 1990.458 354.33 353.68 1990 7 1990.542 352.71 353.80 1990 8 1990.625 351.59 354.09 1990 9 1990.708 351.80 354.32 1990 10 1990.792 353.19 354.58 1990 11 1990.875 354.43 354.71 1990 12 1990.958 355.18 354.72 1991 1 1991.042 355.76 354.99 1991 2 1991.125 356.19 355.08 1991 3 1991.208 356.68 355.26 1991 4 1991.292 357.19 355.44 1991 5 1991.375 357.11 355.48 1991 6 1991.458 356.17 355.57 1991 7 1991.542 354.53 355.64 1991 8 1991.625 353.05 355.56 1991 9 1991.708 352.93 355.45 1991 10 1991.792 354.00 355.39 1991 11 1991.875 355.16 355.40 1991 12 1991.958 355.95 355.46 1992 1 1992.042 356.52 355.73 1992 2 1992.125 356.88 355.76 1992 3 1992.208 357.26 355.80 1992 4 1992.292 357.75 355.96 1992 5 1992.375 357.82 356.18 1992 6 1992.458 356.87 356.29 1992 7 1992.542 355.19 356.33 1992 8 1992.625 353.68 356.24 1992 9 1992.708 353.58 356.14 1992 10 1992.792 354.80 356.20 1992 11 1992.875 355.98 356.22 1992 12 1992.958 356.74 356.25 1993 1 1993.042 357.21 356.37 1993 2 1993.125 357.55 356.39 1993 3 1993.208 357.96 356.52 1993 4 1993.292 358.43 356.67 1993 5 1993.375 358.38 356.73 1993 6 1993.458 357.34 356.68 1993 7 1993.542 355.72 356.74 1993 8 1993.625 354.44 356.90 1993 9 1993.708 354.47 357.05 1993 10 1993.792 355.70 357.18 1993 11 1993.875 356.95 357.30 1993 12 1993.958 357.85 357.48 1994 1 1994.042 358.48 357.62 1994 2 1994.125 359.01 357.85 1994 3 1994.208 359.36 357.91 1994 4 1994.292 359.71 357.93 1994 5 1994.375 359.74 358.06 1994 6 1994.458 358.81 358.11 1994 7 1994.542 357.28 358.27 1994 8 1994.625 356.06 358.56 1994 9 1994.708 356.02 358.67 1994 10 1994.792 357.26 358.80 1994 11 1994.875 358.69 359.04 1994 12 1994.958 359.55 359.15 1995 1 1995.042 360.13 359.29 1995 2 1995.125 360.61 359.50 1995 3 1995.208 361.08 359.70 1995 4 1995.292 361.55 359.85 1995 5 1995.375 361.47 359.84 1995 6 1995.458 360.61 359.93 1995 7 1995.542 358.99 359.99 1995 8 1995.625 357.73 360.20 1995 9 1995.708 358.05 360.65 1995 10 1995.792 359.43 360.89 1995 11 1995.875 360.77 361.05 1995 12 1995.958 361.65 361.19 1996 1 1996.042 362.14 361.22 1996 2 1996.125 362.50 361.33 1996 3 1996.208 362.82 361.40 1996 4 1996.292 363.14 361.42 1996 5 1996.375 363.29 361.68 1996 6 1996.458 362.88 362.22 1996 7 1996.542 361.57 362.61 1996 8 1996.625 360.07 362.57 1996 9 1996.708 359.70 362.32 1996 10 1996.792 360.67 362.15 1996 11 1996.875 361.78 362.08 1996 12 1996.958 362.63 362.20 1997 1 1997.042 363.28 362.33 1997 2 1997.125 363.65 362.47 1997 3 1997.208 364.03 362.62 1997 4 1997.292 364.51 362.81 1997 5 1997.375 364.51 362.94 1997 6 1997.458 363.60 362.96 1997 7 1997.542 361.93 362.96 1997 8 1997.625 360.41 362.89 1997 9 1997.708 360.41 363.01 1997 10 1997.792 361.94 363.42 1997 11 1997.875 363.61 363.89 1997 12 1997.958 364.68 364.23 1998 1 1998.042 365.19 364.26 1998 2 1998.125 365.46 364.31 1998 3 1998.208 365.93 364.53 1998 4 1998.292 366.58 364.90 1998 5 1998.375 366.86 365.32 1998 6 1998.458 366.27 365.66 1998 7 1998.542 364.84 365.88 1998 8 1998.625 363.79 366.28 1998 9 1998.708 364.04 366.62 1998 10 1998.792 365.34 366.78 1998 11 1998.875 366.60 366.85 1998 12 1998.958 367.47 366.97 1999 1 1999.042 368.12 367.19 1999 2 1999.125 368.52 367.38 1999 3 1999.208 368.91 367.53 1999 4 1999.292 369.30 367.65 1999 5 1999.375 369.21 367.70 1999 6 1999.458 368.36 367.79 1999 7 1999.542 366.69 367.74 1999 8 1999.625 365.32 367.77 1999 9 1999.708 365.44 367.99 1999 10 1999.792 366.75 368.18 1999 11 1999.875 368.05 368.28 1999 12 1999.958 368.88 368.36 2000 1 2000.042 369.39 368.48 2000 2 2000.125 369.65 368.51 2000 3 2000.208 369.98 368.58 2000 4 2000.292 370.35 368.68 2000 5 2000.375 370.25 368.72 2000 6 2000.458 369.31 368.79 2000 7 2000.542 367.91 369.04 2000 8 2000.625 366.75 369.26 2000 9 2000.708 366.70 369.25 2000 10 2000.792 367.91 369.29 2000 11 2000.875 369.28 369.45 2000 12 2000.958 370.10 369.53 2001 1 2001.042 370.68 369.79 2001 2 2001.125 371.17 370.02 2001 3 2001.208 371.59 370.17 2001 4 2001.292 371.90 370.22 2001 5 2001.375 371.80 370.27 2001 6 2001.458 370.85 370.32 2001 7 2001.542 369.46 370.57 2001 8 2001.625 368.32 370.80 2001 9 2001.708 368.36 370.89 2001 10 2001.792 369.71 371.10 2001 11 2001.875 371.04 371.26 2001 12 2001.958 371.96 371.44 2002 1 2002.042 372.51 371.55 2002 2 2002.125 372.91 371.65 2002 3 2002.208 373.38 371.84 2002 4 2002.292 373.72 371.96 2002 5 2002.375 373.70 372.13 2002 6 2002.458 372.84 372.29 2002 7 2002.542 371.41 372.55 2002 8 2002.625 370.37 372.90 2002 9 2002.708 370.69 373.31 2002 10 2002.792 371.96 373.45 2002 11 2002.875 373.29 373.58 2002 12 2002.958 374.26 373.81 2003 1 2003.042 374.94 373.94 2003 2 2003.125 375.47 374.16 2003 3 2003.208 375.92 374.34 2003 4 2003.292 376.40 374.62 2003 5 2003.375 376.55 374.95 2003 6 2003.458 375.72 375.17 2003 7 2003.542 374.17 375.32 2003 8 2003.625 372.94 375.52 2003 9 2003.708 373.11 375.78 2003 10 2003.792 374.39 375.92 2003 11 2003.875 375.67 376.00 2003 12 2003.958 376.53 376.11 2004 1 2004.042 377.21 376.24 2004 2 2004.125 377.73 376.41 2004 3 2004.208 378.16 376.56 2004 4 2004.292 378.48 376.69 2004 5 2004.375 378.40 376.81 2004 6 2004.458 377.51 376.96 2004 7 2004.542 375.96 377.15 2004 8 2004.625 374.49 377.13 2004 9 2004.708 374.39 377.06 2004 10 2004.792 375.73 377.22 2004 11 2004.875 377.20 377.50 2004 12 2004.958 378.17 377.68 2005 1 2005.042 378.73 377.76 2005 2 2005.125 379.27 377.95 2005 3 2005.208 379.87 378.26 2005 4 2005.292 380.32 378.52 2005 5 2005.375 380.42 378.80 2005 6 2005.458 379.60 379.02 2005 7 2005.542 377.94 379.11 2005 8 2005.625 376.73 379.37 2005 9 2005.708 376.76 379.46 2005 10 2005.792 378.07 379.63 2005 11 2005.875 379.53 379.86 2005 12 2005.958 380.53 380.04 2006 1 2006.042 381.33 380.32 2006 2 2006.125 381.95 380.58 2006 3 2006.208 382.34 380.70 2006 4 2006.292 382.67 380.84 2006 5 2006.375 382.63 380.98 2006 6 2006.458 381.76 381.15 2006 7 2006.542 380.07 381.27 2006 8 2006.625 378.48 381.20 2006 9 2006.708 378.63 381.40 2006 10 2006.792 380.08 381.66 2006 11 2006.875 381.44 381.76 2006 12 2006.958 382.39 381.91 2007 1 2007.042 383.03 382.01 2007 2 2007.125 383.55 382.13 2007 3 2007.208 384.02 382.36 2007 4 2007.292 384.28 382.45 2007 5 2007.375 384.13 382.50 2007 6 2007.458 383.26 382.70 2007 7 2007.542 381.55 382.82 2007 8 2007.625 380.29 383.06 2007 9 2007.708 380.68 383.46 2007 10 2007.792 382.10 383.65 2007 11 2007.875 383.45 383.74 2007 12 2007.958 384.46 383.96 2008 1 2008.042 385.23 384.21 2008 2 2008.125 385.74 384.34 2008 3 2008.208 386.15 384.52 2008 4 2008.292 386.53 384.72 2008 5 2008.375 386.48 384.85 2008 6 2008.458 385.57 385.01 2008 7 2008.542 384.10 385.42 2008 8 2008.625 382.77 385.57 2008 9 2008.708 382.55 385.29 2008 10 2008.792 383.67 385.15 2008 11 2008.875 385.18 385.41 2008 12 2008.958 386.27 385.73 2009 1 2009.042 387.03 385.98 2009 2 2009.125 387.48 386.05 2009 3 2009.208 387.71 386.06 2009 4 2009.292 387.99 386.17 2009 5 2009.375 387.95 386.35 2009 6 2009.458 386.96 386.46 2009 7 2009.542 385.01 386.42 2009 8 2009.625 383.62 386.50 2009 9 2009.708 383.93 386.66 2009 10 2009.792 385.50 386.92 2009 11 2009.875 386.94 387.12 2009 12 2009.958 387.84 387.27 2010 1 2010.042 388.62 387.60 2010 2 2010.125 389.33 387.93 2010 3 2010.208 389.68 388.03 2010 4 2010.292 389.98 388.17 2010 5 2010.375 389.95 388.36 2010 6 2010.458 389.01 388.51 2010 7 2010.542 387.35 388.75 2010 8 2010.625 386.23 389.05 2010 9 2010.708 386.70 389.40 2010 10 2010.792 388.25 389.68 2010 11 2010.875 389.62 389.80 2010 12 2010.958 390.36 389.82 2011 1 2011.042 390.93 389.88 2011 2 2011.125 391.35 389.93 2011 3 2011.208 391.67 390.03 2011 4 2011.292 392.05 390.24 2011 5 2011.375 392.07 390.45 2011 6 2011.458 391.13 390.62 2011 7 2011.542 389.19 390.56 2011 8 2011.625 387.86 390.64 2011 9 2011.708 388.26 390.98 2011 10 2011.792 389.83 391.30 2011 11 2011.875 391.20 391.42 2011 12 2011.958 392.04 391.53 2012 1 2012.042 392.61 391.55 2012 2 2012.125 393.20 391.78 2012 3 2012.208 393.73 392.09 2012 4 2012.292 393.99 392.19 2012 5 2012.375 393.88 392.28 2012 6 2012.458 392.84 392.36 2012 7 2012.542 391.00 392.43 2012 8 2012.625 389.89 392.73 2012 9 2012.708 390.55 393.27 2012 10 2012.792 392.16 393.59 2012 11 2012.875 393.56 393.73 2012 12 2012.958 394.39 393.82 2013 1 2013.042 395.07 394.09 2013 2 2013.125 395.70 394.33 2013 3 2013.208 396.29 394.67 2013 4 2013.292 396.74 394.93 2013 5 2013.375 396.75 395.14 2013 6 2013.458 395.96 395.45 2013 7 2013.542 394.47 395.83 2013 8 2013.625 393.24 396.01 2013 9 2013.708 393.21 395.89 2013 10 2013.792 394.51 395.93 2013 11 2013.875 395.97 396.16 2013 12 2013.958 396.88 396.34 2014 1 2014.042 397.51 396.44 2014 2 2014.125 397.97 396.54 2014 3 2014.208 398.27 396.59 2014 4 2014.292 398.63 396.78 2014 5 2014.375 398.69 397.04 2014 6 2014.458 397.73 397.16 2014 7 2014.542 396.13 397.46 2014 8 2014.625 395.02 397.83 2014 9 2014.708 395.12 397.89 2014 10 2014.792 396.38 397.91 2014 11 2014.875 397.86 398.15 2014 12 2014.958 398.84 398.36 2015 1 2015.042 399.56 398.52 2015 2 2015.125 400.12 398.69 2015 3 2015.208 400.57 398.86 2015 4 2015.292 400.96 399.09 2015 5 2015.375 400.91 399.26 2015 6 2015.458 400.06 399.49 2015 7 2015.542 398.37 399.66 2015 8 2015.625 397.06 399.84 2015 9 2015.708 397.34 400.14 2015 10 2015.792 398.80 400.37 2015 11 2015.875 400.36 400.68 2015 12 2015.958 401.66 401.18 2016 1 2016.042 402.61 401.58 2016 2 2016.125 403.25 401.86 2016 3 2016.208 403.84 402.17 2016 4 2016.292 404.36 402.50 2016 5 2016.375 404.40 402.75 2016 6 2016.458 403.62 403.02 2016 7 2016.542 402.10 403.32 2016 8 2016.625 400.78 403.51 2016 9 2016.708 400.95 403.76 2016 10 2016.792 402.40 403.99 2016 11 2016.875 403.76 404.08 2016 12 2016.958 404.67 404.19 2017 1 2017.042 405.32 404.24 2017 2 2017.125 405.91 404.48 2017 3 2017.208 406.32 404.62 2017 4 2017.292 406.61 404.74 2017 5 2017.375 406.65 405.00 2017 6 2017.458 405.86 405.28 2017 7 2017.542 404.11 405.38 2017 8 2017.625 402.57 405.39 2017 9 2017.708 402.66 405.51 2017 10 2017.792 404.16 405.74 2017 11 2017.875 405.70 406.00 2017 12 2017.958 406.75 406.24 2018 1 2018.042 407.53 406.48 2018 2 2018.125 408.23 406.85 2018 3 2018.208 408.77 407.13 2018 4 2018.292 409.07 407.27 2018 5 2018.375 408.97 407.35 2018 6 2018.458 408.10 407.53 2018 7 2018.542 406.48 407.77 2018 8 2018.625 405.11 407.84 2018 9 2018.708 405.18 407.96 2018 10 2018.792 406.65 408.19 2018 11 2018.875 408.12 408.38 2018 12 2018.958 409.19 408.66 2019 1 2019.042 409.92 408.87 2019 2 2019.125 410.34 408.96 2019 3 2019.208 410.89 409.25 2019 4 2019.292 411.33 409.53 2019 5 2019.375 411.34 409.71 2019 6 2019.458 410.53 409.97 2019 7 2019.542 408.88 410.17 2019 8 2019.625 407.65 410.38 2019 9 2019.708 407.92 410.69 2019 10 2019.792 409.44 410.99 2019 11 2019.875 410.87 411.12 2019 12 2019.958 411.76 411.24 2020 1 2020.042 412.43 411.37 2020 2 2020.125 412.95 411.57 2020 3 2020.208 413.44 411.79 2020 4 2020.292 413.86 412.06 2020 5 2020.375 413.81 412.18 2020 6 2020.458 412.88 412.32 2020 7 2020.542 411.17 412.45 2020 8 2020.625 409.73 412.47 2020 9 2020.708 410.00 412.77 2020 10 2020.792 411.66 413.21 2020 11 2020.875 413.25 413.50 2020 12 2020.958 414.14 413.62 2021 1 2021.042 414.77 413.71 2021 2 2021.125 415.27 413.90 2021 3 2021.208 415.60 413.96 2021 4 2021.292 415.92 414.12 2021 5 2021.375 416.11 414.48 2021 6 2021.458 415.35 414.79 2021 7 2021.542 413.66 414.94 2021 8 2021.625 412.35 415.09