# file: mlo_F12_MM.dat # # Atmospheric measurements of CCl2F2 (CFC-12, Chlorofluorocarbon-12, F12) # # Measurements are from the NOAA/ESRL/GMD/HATS flask program # (http://www.esrl.noaa.gov/gmd/hats/flask/flasks.html). # Instrument ID: Otto # # Location: MLO -- Mauna Loa, Hawaii -- 19.54 N, 155.58 W, 3397 m Elev. # See http://www.esrl.noaa.gov/gmd/dv/site/site_table.html#hats_flask for # more information about flask sampling sites. # # The data reported are from samples collected approximately once per week in # matching, concurrent, flask pairs and later analyzed on a gas chromatograph # with electron capture detection (GC-ECD) located in Boulder, Colorado, USA. # This system uses two standard reference gases for calibration and has been # in operation since very early in 1995. # # These data represent monthly mean estimates computed using those data marked # with a 0 in flag column 7 of the companion file named "mlo_F12_All.dat". With # flask samples collected only weekly on average, monthly sampling statistics # are poor at best. As a result, the error reported is either the standard # deviation of the mean or a floor single-sample precision estimate. # # PIs: Dr. James W. Elkins, Dr. Bradley D. Hall, # Debra J. Mondeel, J. David Nance # # National Oceanic and Atmospheric Administration (NOAA) # Earth System Research Laboratory (ESRL) # 325 Broadway, R/GMD1 # Boulder, CO 80305-3328 # # Email: James.W.Elkins@noaa.gov; Bradley.Hall@noaa.gov # Phone: (303) 497-6224 (303) 497-7011 # # Email: Debra.J.Mondeel@noaa.gov; David.Nance@noaa.gov # Phone: (303) 497-6013 (303) 497-7002 # # Fax: (303) 497-6290 # # Data use policy: # If you use this data in a publication or report, we would appreciate that you # contact the principal investigators (PIs) first and discuss your interests. # The PIs can discuss the quality of the data and any potential problems with # its analysis. Please contact the PIs for more information. The data should # be cited in presentations or publications along the following lines: CFC-12 # data from the NOAA/ESRL halocarbons flask program. # # Calibration scale: NOAA 2008 # See http://www.esrl.noaa.gov/gmd/ccl/scales.html for more information about # calibration scales. # # Units: ppt # # Missing value: "nan" # # Data Columns: # yr Year # mon Month # m Monthly mean concentration of F12 in ppt # sd Standard deviation of the mean (or single-sample precision value) # n Number of samples # F12ottoMLOyr F12ottoMLOmon F12ottoMLOm F12ottoMLOsd F12ottoMLOn 1994 1 nan nan 0 1994 2 nan nan 0 1994 3 nan nan 0 1994 4 nan nan 0 1994 5 nan nan 0 1994 6 nan nan 0 1994 7 nan nan 0 1994 8 nan nan 0 1994 9 nan nan 0 1994 10 nan nan 0 1994 11 nan nan 0 1994 12 526.420 4.243 1 1995 1 526.179 2.212 4 1995 2 525.852 1.556 2 1995 3 525.818 2.145 2 1995 4 527.668 1.729 4 1995 5 528.643 1.664 2 1995 6 527.458 1.030 2 1995 7 527.825 1.708 2 1995 8 530.389 1.007 3 1995 9 529.626 0.838 3 1995 10 531.142 1.397 2 1995 11 531.309 1.240 4 1995 12 529.705 1.184 2 1996 1 530.965 1.027 5 1996 2 531.728 0.962 3 1996 3 531.021 1.208 4 1996 4 531.542 0.977 4 1996 5 531.180 1.076 4 1996 6 531.880 1.067 5 1996 7 531.980 1.259 2 1996 8 532.654 1.178 4 1996 9 534.201 0.960 4 1996 10 534.308 0.784 4 1996 11 534.881 0.910 4 1996 12 534.684 0.750 4 1997 1 535.963 1.270 2 1997 2 536.180 1.527 3 1997 3 535.114 1.129 5 1997 4 534.107 1.326 2 1997 5 535.524 0.670 4 1997 6 535.324 0.862 5 1997 7 534.969 1.034 3 1997 8 536.335 0.809 4 1997 9 538.600 1.048 1 1997 10 538.727 1.147 4 1997 11 538.180 1.138 2 1997 12 539.031 0.987 5 1998 1 537.112 0.999 4 1998 2 538.375 1.653 4 1998 3 538.341 1.266 4 1998 4 539.048 1.227 3 1998 5 538.945 0.913 4 1998 6 539.147 0.719 3 1998 7 538.950 0.774 4 1998 8 539.202 1.166 5 1998 9 540.870 1.203 3 1998 10 540.177 1.332 3 1998 11 540.737 0.989 4 1998 12 541.033 1.193 4 1999 1 541.268 1.085 4 1999 2 541.636 0.718 5 1999 3 541.451 1.303 3 1999 4 542.221 1.249 2 1999 5 541.523 1.179 3 1999 6 541.957 0.803 5 1999 7 542.230 0.602 3 1999 8 541.266 0.844 5 1999 9 542.571 0.658 3 1999 10 543.016 1.330 4 1999 11 542.533 1.029 4 1999 12 543.280 1.052 5 2000 1 543.622 1.263 4 2000 2 542.893 0.795 5 2000 3 542.167 1.125 3 2000 4 543.824 1.511 3 2000 5 544.164 1.277 5 2000 6 544.597 1.258 4 2000 7 545.209 1.165 4 2000 8 542.802 0.984 4 2000 9 543.573 1.127 4 2000 10 545.554 0.842 4 2000 11 545.185 0.638 4 2000 12 544.781 0.903 3 2001 1 544.615 0.922 3 2001 2 544.995 0.788 4 2001 3 544.904 0.702 3 2001 4 544.144 0.917 3 2001 5 544.293 0.903 3 2001 6 543.795 0.889 4 2001 7 543.633 1.075 3 2001 8 543.687 0.873 3 2001 9 543.980 0.640 4 2001 10 544.740 0.771 3 2001 11 546.259 0.824 4 2001 12 545.016 1.451 3 2002 1 544.586 1.675 3 2002 2 545.105 0.841 3 2002 3 544.580 1.232 5 2002 4 545.464 1.084 4 2002 5 544.853 1.438 4 2002 6 545.961 1.066 5 2002 7 544.797 0.928 4 2002 8 544.498 1.225 4 2002 9 545.401 0.845 5 2002 10 545.586 0.957 4 2002 11 545.661 0.839 3 2002 12 545.684 0.815 5 2003 1 545.807 1.728 4 2003 2 545.021 1.017 4 2003 3 545.089 0.595 5 2003 4 545.282 0.975 4 2003 5 544.311 1.552 5 2003 6 543.648 0.978 6 2003 7 544.207 0.755 4 2003 8 544.019 0.947 3 2003 9 544.871 1.052 3 2003 10 544.724 0.982 4 2003 11 545.199 0.832 4 2003 12 544.461 0.800 4 2004 1 544.259 0.968 3 2004 2 545.641 0.974 5 2004 3 543.994 1.030 4 2004 4 544.651 0.907 4 2004 5 544.268 0.701 4 2004 6 543.784 0.845 5 2004 7 543.817 0.755 3 2004 8 543.123 0.765 4 2004 9 543.239 0.530 5 2004 10 543.227 1.497 4 2004 11 544.260 1.360 1 2004 12 543.439 0.970 3 2005 1 543.627 0.955 4 2005 2 543.900 1.077 4 2005 3 543.657 1.052 5 2005 4 543.397 1.205 4 2005 5 543.288 0.959 5 2005 6 542.384 1.074 4 2005 7 542.923 0.734 4 2005 8 542.890 0.811 5 2005 9 542.164 0.734 4 2005 10 542.772 0.894 4 2005 11 543.344 0.915 5 2005 12 544.043 1.649 4 2006 1 542.636 1.296 4 2006 2 542.260 1.398 5 2006 3 542.063 1.349 4 2006 4 542.583 1.124 4 2006 5 542.068 0.826 4 2006 6 541.534 0.748 4 2006 7 541.516 0.742 3 2006 8 540.893 0.846 5 2006 9 540.711 0.847 4 2006 10 540.644 0.944 4 2006 11 540.878 1.081 5 2006 12 540.868 1.052 4 2007 1 540.803 0.864 4 2007 2 540.135 0.735 5 2007 3 539.918 0.723 4 2007 4 540.287 1.446 4 2007 5 540.059 1.141 4 2007 6 539.154 0.865 4 2007 7 538.580 0.770 4 2007 8 538.439 0.864 5 2007 9 538.076 1.011 4 2007 10 538.514 1.460 3 2007 11 538.544 0.967 5 2007 12 537.936 1.520 4 2008 1 537.585 1.033 4 2008 2 536.955 1.170 5 2008 3 537.200 1.080 4 2008 4 536.835 0.861 5 2008 5 536.828 1.417 4 2008 6 536.286 1.021 4 2008 7 536.534 0.943 5 2008 8 535.836 0.904 4 2008 9 537.107 0.660 4 2008 10 535.878 0.865 5 2008 11 535.610 0.716 4 2008 12 536.989 1.544 3 2009 1 535.637 1.349 5 2009 2 535.489 1.670 4 2009 3 535.456 0.841 3 2009 4 534.731 1.007 5 2009 5 534.633 0.924 4 2009 6 534.266 0.863 4 2009 7 533.592 0.674 5 2009 8 534.080 0.997 2 2009 9 533.276 1.032 5 2009 10 532.778 0.868 4 2009 11 533.136 0.789 4 2009 12 532.682 0.945 4 2010 1 532.324 1.040 4 2010 2 533.851 1.111 4 2010 3 533.152 1.214 5 2010 4 532.160 1.647 3 2010 5 530.837 0.795 5 2010 6 531.727 1.729 4 2010 7 530.759 0.900 4 2010 8 529.960 0.776 5 2010 9 530.087 0.746 4 2010 10 530.750 1.164 4 2010 11 530.373 1.014 4 2010 12 530.157 1.344 4 2011 1 530.186 0.982 4 2011 2 530.250 1.462 3 2011 3 528.808 0.814 4 2011 4 528.479 0.715 3 2011 5 528.716 1.086 4 2011 6 528.910 0.868 4 2011 7 528.556 0.885 4 2011 8 528.483 0.852 5 2011 9 527.812 0.842 4 2011 10 528.700 0.735 4 2011 11 527.634 0.996 5 2011 12 528.170 0.956 4 2012 1 526.346 1.329 3 2012 2 526.268 1.115 4 2012 3 526.395 0.929 4 2012 4 526.881 0.658 5 2012 5 526.492 1.051 3 2012 6 525.975 0.958 4 2012 7 524.581 0.599 5 2012 8 524.883 0.602 4 2012 9 526.290 1.009 3 2012 10 524.883 0.952 5 2012 11 524.836 0.647 4 2012 12 524.737 0.794 4 2013 1 524.602 1.146 4 2013 2 523.627 1.084 4 2013 3 523.828 0.657 4 2013 4 523.466 0.755 5 2013 5 523.629 0.732 4 2013 6 523.287 0.733 3 2013 7 522.994 0.688 4 2013 8 523.001 0.891 4 2013 9 522.359 0.935 4 2013 10 521.915 0.784 3 2013 11 521.597 0.825 4 2013 12 521.483 0.752 5 2014 1 521.433 0.665 4 2014 2 521.401 0.925 4 2014 3 522.033 0.790 4 2014 4 521.082 0.950 5 2014 5 521.736 0.722 3 2014 6 520.207 0.856 4 2014 7 520.567 0.580 4 2014 8 520.922 0.700 4 2014 9 520.758 0.622 4 2014 10 519.816 0.680 4 2014 11 520.196 0.603 3 2014 12 519.851 0.958 5 2015 1 519.690 0.700 4 2015 2 518.862 0.986 4 2015 3 nan nan 0 2015 4 nan nan 0 2015 5 nan nan 0 2015 6 nan nan 0 2015 7 nan nan 0 2015 8 519.174 3.201 2 2015 9 518.757 1.093 3 2015 10 516.883 1.905 4 2015 11 517.671 1.081 3 2015 12 517.123 1.877 3 2016 1 518.140 4.047 1 2016 2 nan nan 0 2016 3 515.990 4.643 1 2016 4 nan nan 0 2016 5 514.840 3.589 1 2016 6 nan nan 0 2016 7 nan nan 0 2016 8 nan nan 0 2016 9 nan nan 0 2016 10 nan nan 0 2016 11 nan nan 0 2016 12 514.595 2.135 2 2017 1 512.130 1.386 1 2017 2 512.560 1.572 1 2017 3 512.650 6.271 1 2017 4 nan nan 0 2017 5 nan nan 0 2017 6 nan nan 0 2017 7 nan nan 0 2017 8 nan nan 0 2017 9 nan nan 0 2017 10 nan nan 0 2017 11 nan nan 0 2017 12 nan nan 0