# -------------------------------------------------------------------- # 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 08:02:29 2024 # # # -------------------------------------------------------------------- # # # See gml.noaa.gov/ccgg/trends/ for additional details. # # # Uncertainties in the global monthly means are estimated using two # terms: The first is a bootstrap (resampling) method that varies the # sites in our network. Each pseudo-network contains the same number of # sites as our actual NOAA ESRL cooperative global air sampling network, # but some are repeated and some are excluded. The second term is a # Monte Carlo method that randomly modifies the data to account for # measurement uncertainty. In both cases, 100 globally-averaged time # series are created. Standard deviations of the monthly means are # calculated, and the two terms (network and analytical) are taken in # quadrature to give the reported uncertainties. A default value (-9.9) # indicates the uncertainty has not yet been calculated for that month. # Please see Dlugokencky et al., 1994, JGR, vol. 99, 17021-17043, for a # complete discussion. # # SF6 expressed as a mole fraction in dry air, picomol/mol, abbreviated as ppt # # 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 change for the same # reasons. Usually these changes are minor. # # year month decimal average average_unc trend trend_unc 1997 7 1997.542 4.00 0.01 4.01 0.00 1997 8 1997.625 4.00 0.00 4.02 0.00 1997 9 1997.708 4.02 0.00 4.04 0.00 1997 10 1997.792 4.05 0.00 4.06 0.00 1997 11 1997.875 4.08 0.01 4.08 0.00 1997 12 1997.958 4.10 0.01 4.09 0.00 1998 1 1998.042 4.11 0.01 4.11 0.00 1998 2 1998.125 4.13 0.01 4.13 0.00 1998 3 1998.208 4.15 0.01 4.15 0.00 1998 4 1998.292 4.18 0.01 4.17 0.00 1998 5 1998.375 4.19 0.01 4.18 0.00 1998 6 1998.458 4.20 0.00 4.20 0.00 1998 7 1998.542 4.21 0.01 4.22 0.00 1998 8 1998.625 4.22 0.01 4.24 0.00 1998 9 1998.708 4.24 0.01 4.25 0.00 1998 10 1998.792 4.27 0.01 4.27 0.00 1998 11 1998.875 4.29 0.01 4.28 0.00 1998 12 1998.958 4.31 0.01 4.30 0.00 1999 1 1999.042 4.33 0.01 4.31 0.00 1999 2 1999.125 4.35 0.01 4.32 0.00 1999 3 1999.208 4.36 0.00 4.34 0.00 1999 4 1999.292 4.36 0.00 4.35 0.00 1999 5 1999.375 4.35 0.01 4.37 0.00 1999 6 1999.458 4.36 0.01 4.38 0.00 1999 7 1999.542 4.37 0.01 4.39 0.00 1999 8 1999.625 4.38 0.00 4.41 0.00 1999 9 1999.708 4.40 0.01 4.42 0.00 1999 10 1999.792 4.43 0.01 4.44 0.00 1999 11 1999.875 4.46 0.01 4.45 0.00 1999 12 1999.958 4.48 0.01 4.47 0.00 2000 1 2000.042 4.50 0.01 4.49 0.00 2000 2 2000.125 4.51 0.01 4.51 0.00 2000 3 2000.208 4.53 0.01 4.52 0.00 2000 4 2000.292 4.55 0.01 4.54 0.00 2000 5 2000.375 4.57 0.00 4.56 0.00 2000 6 2000.458 4.58 0.01 4.57 0.00 2000 7 2000.542 4.58 0.01 4.59 0.00 2000 8 2000.625 4.59 0.01 4.61 0.00 2000 9 2000.708 4.62 0.01 4.63 0.00 2000 10 2000.792 4.65 0.01 4.64 0.00 2000 11 2000.875 4.66 0.01 4.66 0.00 2000 12 2000.958 4.68 0.01 4.68 0.00 2001 1 2001.042 4.69 0.01 4.69 0.00 2001 2 2001.125 4.71 0.01 4.71 0.00 2001 3 2001.208 4.73 0.01 4.72 0.00 2001 4 2001.292 4.75 0.01 4.74 0.00 2001 5 2001.375 4.76 0.00 4.75 0.00 2001 6 2001.458 4.76 0.01 4.77 0.00 2001 7 2001.542 4.77 0.01 4.79 0.00 2001 8 2001.625 4.78 0.01 4.80 0.00 2001 9 2001.708 4.81 0.01 4.82 0.00 2001 10 2001.792 4.83 0.00 4.83 0.00 2001 11 2001.875 4.86 0.01 4.85 0.00 2001 12 2001.958 4.88 0.01 4.87 0.00 2002 1 2002.042 4.89 0.01 4.88 0.00 2002 2 2002.125 4.91 0.01 4.90 0.00 2002 3 2002.208 4.93 0.01 4.92 0.00 2002 4 2002.292 4.95 0.00 4.93 0.00 2002 5 2002.375 4.96 0.00 4.95 0.00 2002 6 2002.458 4.96 0.00 4.97 0.00 2002 7 2002.542 4.98 0.01 4.99 0.00 2002 8 2002.625 4.99 0.00 5.01 0.00 2002 9 2002.708 5.01 0.00 5.03 0.00 2002 10 2002.792 5.03 0.01 5.05 0.00 2002 11 2002.875 5.06 0.01 5.07 0.00 2002 12 2002.958 5.09 0.00 5.09 0.00 2003 1 2003.042 5.11 0.01 5.11 0.00 2003 2 2003.125 5.12 0.01 5.13 0.00 2003 3 2003.208 5.15 0.01 5.15 0.00 2003 4 2003.292 5.19 0.00 5.17 0.00 2003 5 2003.375 5.22 0.00 5.20 0.00 2003 6 2003.458 5.23 0.00 5.22 0.00 2003 7 2003.542 5.24 0.01 5.24 0.00 2003 8 2003.625 5.25 0.01 5.26 0.00 2003 9 2003.708 5.28 0.01 5.28 0.00 2003 10 2003.792 5.30 0.01 5.30 0.00 2003 11 2003.875 5.32 0.01 5.32 0.00 2003 12 2003.958 5.34 0.01 5.34 0.00 2004 1 2004.042 5.36 0.01 5.36 0.00 2004 2 2004.125 5.38 0.01 5.38 0.00 2004 3 2004.208 5.40 0.00 5.40 0.00 2004 4 2004.292 5.42 0.00 5.41 0.00 2004 5 2004.375 5.44 0.00 5.43 0.00 2004 6 2004.458 5.44 0.01 5.45 0.00 2004 7 2004.542 5.45 0.01 5.47 0.00 2004 8 2004.625 5.47 0.00 5.48 0.00 2004 9 2004.708 5.49 0.00 5.50 0.00 2004 10 2004.792 5.51 0.00 5.52 0.00 2004 11 2004.875 5.54 0.01 5.53 0.00 2004 12 2004.958 5.56 0.01 5.55 0.00 2005 1 2005.042 5.58 0.01 5.57 0.00 2005 2 2005.125 5.60 0.01 5.59 0.00 2005 3 2005.208 5.62 0.00 5.60 0.00 2005 4 2005.292 5.64 0.00 5.62 0.00 2005 5 2005.375 5.65 0.00 5.64 0.00 2005 6 2005.458 5.65 0.00 5.66 0.00 2005 7 2005.542 5.66 0.00 5.68 0.00 2005 8 2005.625 5.68 0.00 5.70 0.00 2005 9 2005.708 5.70 0.00 5.72 0.00 2005 10 2005.792 5.73 0.00 5.74 0.00 2005 11 2005.875 5.75 0.00 5.76 0.00 2005 12 2005.958 5.78 0.01 5.78 0.00 2006 1 2006.042 5.81 0.01 5.80 0.00 2006 2 2006.125 5.83 0.00 5.82 0.00 2006 3 2006.208 5.85 0.00 5.84 0.00 2006 4 2006.292 5.87 0.00 5.86 0.00 2006 5 2006.375 5.89 0.01 5.88 0.00 2006 6 2006.458 5.90 0.01 5.90 0.00 2006 7 2006.542 5.91 0.00 5.92 0.00 2006 8 2006.625 5.93 0.00 5.94 0.00 2006 9 2006.708 5.95 0.00 5.96 0.00 2006 10 2006.792 5.97 0.01 5.99 0.00 2006 11 2006.875 6.00 0.01 6.01 0.00 2006 12 2006.958 6.03 0.00 6.03 0.00 2007 1 2007.042 6.06 0.01 6.05 0.00 2007 2 2007.125 6.09 0.01 6.07 0.00 2007 3 2007.208 6.12 0.00 6.10 0.00 2007 4 2007.292 6.14 0.01 6.12 0.00 2007 5 2007.375 6.15 0.01 6.14 0.00 2007 6 2007.458 6.16 0.01 6.16 0.00 2007 7 2007.542 6.17 0.01 6.19 0.00 2007 8 2007.625 6.19 0.01 6.21 0.00 2007 9 2007.708 6.22 0.01 6.24 0.00 2007 10 2007.792 6.25 0.01 6.26 0.00 2007 11 2007.875 6.28 0.01 6.28 0.00 2007 12 2007.958 6.31 0.01 6.31 0.00 2008 1 2008.042 6.34 0.01 6.33 0.00 2008 2 2008.125 6.37 0.01 6.36 0.00 2008 3 2008.208 6.39 0.01 6.38 0.00 2008 4 2008.292 6.41 0.01 6.40 0.00 2008 5 2008.375 6.44 0.01 6.43 0.00 2008 6 2008.458 6.45 0.01 6.45 0.00 2008 7 2008.542 6.46 0.01 6.48 0.00 2008 8 2008.625 6.48 0.01 6.50 0.00 2008 9 2008.708 6.51 0.01 6.53 0.00 2008 10 2008.792 6.55 0.00 6.55 0.00 2008 11 2008.875 6.59 0.01 6.58 0.00 2008 12 2008.958 6.62 0.01 6.60 0.00 2009 1 2009.042 6.64 0.01 6.63 0.00 2009 2 2009.125 6.67 0.01 6.65 0.00 2009 3 2009.208 6.69 0.01 6.67 0.00 2009 4 2009.292 6.71 0.01 6.70 0.00 2009 5 2009.375 6.72 0.01 6.72 0.00 2009 6 2009.458 6.73 0.01 6.74 0.00 2009 7 2009.542 6.75 0.01 6.77 0.00 2009 8 2009.625 6.77 0.01 6.79 0.00 2009 9 2009.708 6.80 0.01 6.82 0.00 2009 10 2009.792 6.83 0.01 6.84 0.00 2009 11 2009.875 6.86 0.00 6.86 0.00 2009 12 2009.958 6.89 0.00 6.89 0.00 2010 1 2010.042 6.92 0.01 6.91 0.00 2010 2 2010.125 6.95 0.01 6.94 0.00 2010 3 2010.208 6.98 0.01 6.96 0.00 2010 4 2010.292 6.99 0.01 6.98 0.00 2010 5 2010.375 7.01 0.01 7.00 0.00 2010 6 2010.458 7.03 0.01 7.03 0.00 2010 7 2010.542 7.05 0.01 7.05 0.00 2010 8 2010.625 7.07 0.00 7.07 0.00 2010 9 2010.708 7.08 0.01 7.09 0.00 2010 10 2010.792 7.11 0.01 7.12 0.00 2010 11 2010.875 7.13 0.01 7.14 0.00 2010 12 2010.958 7.16 0.01 7.16 0.00 2011 1 2011.042 7.18 0.00 7.18 0.00 2011 2 2011.125 7.20 0.00 7.20 0.00 2011 3 2011.208 7.23 0.00 7.22 0.00 2011 4 2011.292 7.26 0.01 7.24 0.00 2011 5 2011.375 7.28 0.01 7.27 0.00 2011 6 2011.458 7.29 0.01 7.29 0.00 2011 7 2011.542 7.30 0.01 7.31 0.00 2011 8 2011.625 7.31 0.01 7.34 0.00 2011 9 2011.708 7.33 0.01 7.36 0.00 2011 10 2011.792 7.37 0.01 7.38 0.00 2011 11 2011.875 7.41 0.01 7.41 0.00 2011 12 2011.958 7.44 0.01 7.44 0.00 2012 1 2012.042 7.47 0.00 7.46 0.00 2012 2 2012.125 7.50 0.00 7.49 0.00 2012 3 2012.208 7.53 0.01 7.51 0.00 2012 4 2012.292 7.55 0.00 7.54 0.00 2012 5 2012.375 7.57 0.01 7.56 0.00 2012 6 2012.458 7.59 0.01 7.59 0.00 2012 7 2012.542 7.60 0.01 7.62 0.00 2012 8 2012.625 7.62 0.01 7.64 0.00 2012 9 2012.708 7.65 0.00 7.67 0.00 2012 10 2012.792 7.69 0.01 7.69 0.00 2012 11 2012.875 7.73 0.01 7.72 0.00 2012 12 2012.958 7.75 0.01 7.75 0.00 2013 1 2013.042 7.78 0.01 7.77 0.00 2013 2 2013.125 7.81 0.01 7.80 0.00 2013 3 2013.208 7.83 0.01 7.82 0.00 2013 4 2013.292 7.86 0.01 7.85 0.00 2013 5 2013.375 7.88 0.01 7.87 0.00 2013 6 2013.458 7.90 0.01 7.90 0.00 2013 7 2013.542 7.92 0.01 7.93 0.00 2013 8 2013.625 7.94 0.01 7.95 0.00 2013 9 2013.708 7.97 0.01 7.98 0.00 2013 10 2013.792 8.00 0.01 8.01 0.00 2013 11 2013.875 8.04 0.01 8.03 0.00 2013 12 2013.958 8.06 0.01 8.06 0.00 2014 1 2014.042 8.09 0.01 8.09 0.00 2014 2 2014.125 8.11 0.01 8.12 0.00 2014 3 2014.208 8.14 0.01 8.15 0.00 2014 4 2014.292 8.18 0.01 8.18 0.00 2014 5 2014.375 8.21 0.01 8.20 0.00 2014 6 2014.458 8.23 0.01 8.23 0.00 2014 7 2014.542 8.26 0.01 8.26 0.00 2014 8 2014.625 8.28 0.01 8.29 0.00 2014 9 2014.708 8.32 0.01 8.32 0.00 2014 10 2014.792 8.35 0.00 8.35 0.00 2014 11 2014.875 8.39 0.00 8.38 0.00 2014 12 2014.958 8.42 0.00 8.41 0.00 2015 1 2015.042 8.44 0.01 8.43 0.00 2015 2 2015.125 8.47 0.01 8.46 0.00 2015 3 2015.208 8.50 0.01 8.49 0.00 2015 4 2015.292 8.52 0.01 8.52 0.00 2015 5 2015.375 8.54 0.01 8.54 0.00 2015 6 2015.458 8.56 0.01 8.57 0.00 2015 7 2015.542 8.57 0.01 8.60 0.00 2015 8 2015.625 8.60 0.01 8.62 0.00 2015 9 2015.708 8.63 0.01 8.65 0.00 2015 10 2015.792 8.67 0.01 8.68 0.00 2015 11 2015.875 8.71 0.01 8.70 0.00 2015 12 2015.958 8.74 0.01 8.73 0.00 2016 1 2016.042 8.77 0.01 8.76 0.00 2016 2 2016.125 8.80 0.01 8.79 0.00 2016 3 2016.208 8.83 0.01 8.81 0.00 2016 4 2016.292 8.86 0.01 8.84 0.00 2016 5 2016.375 8.89 0.01 8.87 0.00 2016 6 2016.458 8.91 0.01 8.90 0.00 2016 7 2016.542 8.91 0.01 8.92 0.00 2016 8 2016.625 8.92 0.01 8.95 0.00 2016 9 2016.708 8.94 0.01 8.98 0.00 2016 10 2016.792 8.99 0.01 9.01 0.00 2016 11 2016.875 9.03 0.01 9.04 0.00 2016 12 2016.958 9.07 0.01 9.07 0.00 2017 1 2017.042 9.10 0.01 9.10 0.00 2017 2 2017.125 9.13 0.01 9.12 0.00 2017 3 2017.208 9.17 0.01 9.15 0.00 2017 4 2017.292 9.20 0.01 9.18 0.00 2017 5 2017.375 9.23 0.01 9.21 0.00 2017 6 2017.458 9.24 0.01 9.24 0.00 2017 7 2017.542 9.26 0.01 9.27 0.00 2017 8 2017.625 9.29 0.01 9.30 0.00 2017 9 2017.708 9.32 0.01 9.33 0.00 2017 10 2017.792 9.35 0.01 9.36 0.01 2017 11 2017.875 9.39 0.01 9.39 0.01 2017 12 2017.958 9.42 0.01 9.42 0.01 2018 1 2018.042 9.45 0.01 9.44 0.01 2018 2 2018.125 9.48 0.01 9.47 0.01 2018 3 2018.208 9.51 0.01 9.50 0.01 2018 4 2018.292 9.53 0.01 9.53 0.01 2018 5 2018.375 9.55 0.01 9.56 0.01 2018 6 2018.458 9.58 0.01 9.59 0.01 2018 7 2018.542 9.61 0.01 9.62 0.01 2018 8 2018.625 9.63 0.01 9.65 0.01 2018 9 2018.708 9.66 0.01 9.67 0.01 2018 10 2018.792 9.71 0.01 9.70 0.01 2018 11 2018.875 9.75 0.01 9.73 0.00 2018 12 2018.958 9.78 0.01 9.76 0.00 2019 1 2019.042 9.80 0.01 9.79 0.00 2019 2 2019.125 9.82 0.01 9.82 0.00 2019 3 2019.208 9.85 0.01 9.85 0.00 2019 4 2019.292 9.88 0.01 9.87 0.00 2019 5 2019.375 9.90 0.01 9.90 0.00 2019 6 2019.458 9.92 0.01 9.93 0.00 2019 7 2019.542 9.96 0.01 9.96 0.00 2019 8 2019.625 9.98 0.01 9.98 0.00 2019 9 2019.708 10.00 0.01 10.01 0.00 2019 10 2019.792 10.03 0.01 10.04 0.00 2019 11 2019.875 10.06 0.01 10.06 0.00 2019 12 2019.958 10.09 0.01 10.09 0.00 2020 1 2020.042 10.12 0.01 10.12 0.00 2020 2 2020.125 10.15 0.01 10.14 0.00 2020 3 2020.208 10.18 0.01 10.17 0.00 2020 4 2020.292 10.20 0.01 10.20 0.00 2020 5 2020.375 10.23 0.01 10.22 0.00 2020 6 2020.458 10.26 0.01 10.25 0.00 2020 7 2020.542 10.28 0.01 10.28 0.01 2020 8 2020.625 10.30 0.01 10.31 0.01 2020 9 2020.708 10.33 0.01 10.34 0.01 2020 10 2020.792 10.36 0.01 10.37 0.01 2020 11 2020.875 10.39 0.01 10.40 0.01 2020 12 2020.958 10.43 0.01 10.43 0.01 2021 1 2021.042 10.46 0.01 10.46 0.01 2021 2 2021.125 10.49 0.01 10.49 0.01 2021 3 2021.208 10.52 0.01 10.52 0.01 2021 4 2021.292 10.56 0.01 10.55 0.01 2021 5 2021.375 10.60 0.01 10.58 0.01 2021 6 2021.458 10.63 0.01 10.62 0.01 2021 7 2021.542 10.64 0.01 10.65 0.01 2021 8 2021.625 10.67 0.01 10.69 0.01 2021 9 2021.708 10.70 0.01 10.72 0.01 2021 10 2021.792 10.74 0.01 10.75 0.01 2021 11 2021.875 10.79 0.01 10.78 0.01 2021 12 2021.958 10.83 0.01 10.82 0.01 2022 1 2022.042 10.85 0.01 10.85 0.01 2022 2 2022.125 10.89 0.01 10.88 0.01 2022 3 2022.208 10.92 0.01 10.91 0.01 2022 4 2022.292 10.96 0.01 10.94 0.01 2022 5 2022.375 10.99 0.01 10.97 0.01 2022 6 2022.458 11.01 0.01 11.00 0.00 2022 7 2022.542 11.03 0.01 11.04 0.00 2022 8 2022.625 11.05 0.01 11.07 0.00 2022 9 2022.708 11.07 0.01 11.10 0.00 2022 10 2022.792 11.11 0.01 11.13 0.00 2022 11 2022.875 11.15 0.01 11.16 0.00 2022 12 2022.958 11.20 0.01 11.19 0.00 2023 1 2023.042 11.23 0.01 11.22 0.00 2023 2 2023.125 11.26 -9.99 11.25 -9.99 2023 3 2023.208 11.29 -9.99 11.29 -9.99 2023 4 2023.292 11.32 -9.99 11.32 -9.99 2023 5 2023.375 11.36 -9.99 11.35 -9.99 2023 6 2023.458 11.39 -9.99 11.39 -9.99 2023 7 2023.542 11.42 -9.99 11.42 -9.99 2023 8 2023.625 11.45 -9.99 11.45 -9.99 2023 9 2023.708 11.47 -9.99 11.49 -9.99 2023 10 2023.792 11.50 -9.99 11.52 -9.99 2023 11 2023.875 11.56 -9.99 11.56 -9.99 2023 12 2023.958 11.60 -9.99 11.59 -9.99