# file: nwr_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: NWR -- Niwot Ridge, Colorado -- 40.05 N, 105.58 W, 3523 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 "nwr_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 # F12ottoNWRyr F12ottoNWRmon F12ottoNWRm F12ottoNWRsd F12ottoNWRn 1995 1 529.020 2.690 1 1995 2 527.317 1.771 3 1995 3 526.835 1.927 2 1995 4 529.789 2.463 2 1995 5 nan nan 0 1995 6 528.267 1.615 3 1995 7 530.384 2.628 3 1995 8 534.420 1.709 1 1995 9 531.733 2.504 3 1995 10 534.557 1.643 5 1995 11 533.789 0.781 3 1995 12 533.467 1.118 4 1996 1 532.302 2.228 5 1996 2 533.838 1.568 4 1996 3 533.461 0.789 3 1996 4 532.783 1.172 5 1996 5 534.766 1.383 4 1996 6 534.102 1.082 4 1996 7 533.994 0.945 4 1996 8 536.372 1.288 2 1996 9 536.403 0.845 3 1996 10 536.239 0.915 4 1996 11 535.110 1.927 4 1996 12 534.137 1.343 3 1997 1 536.532 0.732 4 1997 2 536.130 0.905 4 1997 3 536.094 0.946 4 1997 4 535.853 1.446 3 1997 5 536.066 0.924 2 1997 6 536.544 0.931 4 1997 7 537.047 0.992 2 1997 8 537.332 0.868 4 1997 9 538.298 1.143 5 1997 10 539.782 1.578 3 1997 11 539.768 1.067 3 1997 12 539.301 1.513 4 1998 1 539.664 0.999 3 1998 2 539.419 1.830 3 1998 3 538.672 1.014 3 1998 4 539.486 1.032 2 1998 5 538.470 1.060 1 1998 6 539.309 0.962 2 1998 7 540.128 0.578 2 1998 8 540.504 0.725 3 1998 9 540.325 0.974 3 1998 10 539.867 1.363 3 1998 11 540.729 0.646 4 1998 12 540.734 1.117 5 1999 1 540.034 1.071 3 1999 2 541.303 1.404 5 1999 3 541.215 1.994 3 1999 4 541.223 1.283 2 1999 5 540.449 0.638 4 1999 6 541.145 0.882 4 1999 7 542.031 0.849 2 1999 8 542.194 0.964 3 1999 9 542.262 0.706 3 1999 10 542.799 1.002 3 1999 11 542.160 1.294 5 1999 12 542.635 1.534 2 2000 1 542.466 1.110 4 2000 2 542.069 1.214 5 2000 3 542.793 0.749 4 2000 4 544.467 1.234 3 2000 5 544.312 0.820 5 2000 6 545.767 1.516 3 2000 7 545.878 1.361 3 2000 8 544.703 0.776 4 2000 9 545.099 0.629 4 2000 10 545.427 0.828 2 2000 11 545.471 1.055 4 2000 12 545.407 0.790 4 2001 1 544.875 0.823 5 2001 2 544.747 0.889 3 2001 3 544.107 0.773 4 2001 4 544.196 0.978 3 2001 5 544.517 0.786 4 2001 6 544.189 1.537 3 2001 7 544.646 0.894 4 2001 8 545.184 0.774 3 2001 9 545.211 0.775 3 2001 10 545.385 1.137 5 2001 11 545.793 1.254 2 2001 12 545.933 1.251 4 2002 1 546.282 1.233 4 2002 2 546.603 1.180 2 2002 3 546.351 1.214 4 2002 4 546.057 1.386 3 2002 5 545.467 1.313 3 2002 6 545.444 0.963 3 2002 7 545.785 0.853 3 2002 8 546.725 1.287 2 2002 9 546.063 1.079 2 2002 10 545.757 0.881 2 2002 11 546.538 1.218 3 2002 12 546.293 1.228 3 2003 1 545.641 1.033 4 2003 2 545.470 0.818 1 2003 3 545.964 1.310 3 2003 4 546.235 0.911 2 2003 5 545.595 1.202 4 2003 6 544.548 0.668 3 2003 7 545.104 0.774 3 2003 8 nan nan 0 2003 9 546.085 1.290 4 2003 10 545.509 1.151 4 2003 11 545.052 0.973 4 2003 12 545.173 0.793 5 2004 1 544.129 0.818 2 2004 2 544.899 0.915 3 2004 3 543.842 0.549 4 2004 4 544.533 0.622 3 2004 5 543.848 1.115 2 2004 6 543.173 0.757 3 2004 7 543.501 0.848 3 2004 8 542.644 1.549 2 2004 9 543.593 1.379 3 2004 10 543.129 1.102 4 2004 11 544.432 1.400 2 2004 12 543.863 0.895 4 2005 1 543.148 1.267 3 2005 2 543.896 1.026 3 2005 3 544.959 0.798 4 2005 4 544.040 1.301 3 2005 5 543.243 1.186 3 2005 6 nan nan 0 2005 7 542.335 0.740 4 2005 8 543.127 0.681 4 2005 9 542.020 0.947 1 2005 10 542.270 0.737 1 2005 11 543.634 1.145 4 2005 12 542.756 1.364 4 2006 1 543.341 1.372 3 2006 2 542.046 1.195 5 2006 3 541.966 2.319 2 2006 4 542.142 1.134 4 2006 5 541.774 0.824 3 2006 6 541.130 0.856 3 2006 7 541.696 0.886 5 2006 8 541.588 0.924 2 2006 9 540.432 0.828 3 2006 10 541.412 0.899 4 2006 11 540.636 0.750 4 2006 12 539.771 1.011 3 2007 1 540.811 1.030 4 2007 2 541.232 0.893 3 2007 3 540.689 1.110 2 2007 4 539.725 0.835 3 2007 5 540.035 0.756 4 2007 6 538.837 0.925 2 2007 7 538.573 0.676 3 2007 8 539.014 0.483 2 2007 9 538.816 0.641 2 2007 10 538.557 1.368 4 2007 11 537.596 1.164 4 2007 12 539.120 2.852 2 2008 1 537.835 1.568 4 2008 2 537.174 1.437 4 2008 3 537.134 1.013 4 2008 4 536.201 1.108 5 2008 5 536.462 0.995 2 2008 6 535.821 0.779 5 2008 7 536.148 0.969 2 2008 8 536.087 0.806 2 2008 9 536.477 0.792 4 2008 10 535.499 0.651 4 2008 11 536.001 1.053 4 2008 12 536.791 1.331 5 2009 1 535.849 1.065 4 2009 2 535.155 0.785 3 2009 3 535.480 1.126 4 2009 4 534.108 0.894 2 2009 5 533.970 0.882 2 2009 6 533.938 0.959 3 2009 7 533.089 0.962 4 2009 8 532.771 1.179 4 2009 9 533.122 0.911 4 2009 10 532.158 1.327 3 2009 11 532.938 0.821 5 2009 12 532.088 0.900 3 2010 1 532.068 1.076 4 2010 2 532.077 0.800 4 2010 3 532.639 1.182 4 2010 4 530.792 0.658 4 2010 5 530.075 1.393 2 2010 6 530.710 0.657 2 2010 7 530.350 1.099 3 2010 8 530.615 0.770 3 2010 9 530.357 1.119 4 2010 10 529.976 1.280 2 2010 11 529.635 1.142 4 2010 12 530.308 0.995 3 2011 1 530.177 1.287 4 2011 2 528.779 1.832 4 2011 3 529.180 0.750 4 2011 4 529.694 1.492 3 2011 5 527.980 0.965 3 2011 6 528.119 0.908 3 2011 7 527.839 1.048 2 2011 8 528.510 0.939 3 2011 9 527.981 0.984 3 2011 10 528.760 0.831 4 2011 11 527.412 0.783 4 2011 12 527.598 1.378 3 2012 1 526.631 1.164 3 2012 2 526.490 1.182 4 2012 3 525.909 0.813 2 2012 4 525.876 1.029 3 2012 5 525.381 0.836 2 2012 6 524.583 0.886 2 2012 7 524.552 0.997 5 2012 8 524.172 0.989 3 2012 9 524.420 0.769 1 2012 10 524.329 0.758 5 2012 11 523.986 0.940 4 2012 12 524.391 1.079 3 2013 1 524.081 0.925 5 2013 2 523.777 0.825 2 2013 3 523.528 0.691 3 2013 4 523.552 0.656 4 2013 5 523.110 1.090 3 2013 6 nan nan 0 2013 7 522.144 0.981 4 2013 8 522.233 0.876 4 2013 9 521.796 0.751 4 2013 10 521.737 0.795 2 2013 11 521.321 0.652 4 2013 12 521.209 0.980 5 2014 1 520.940 0.800 1 2014 2 520.798 0.775 4 2014 3 520.863 1.033 4 2014 4 519.890 1.155 1 2014 5 520.800 1.178 3 2014 6 520.319 0.714 5 2014 7 520.329 0.778 3 2014 8 520.532 1.502 3 2014 9 519.808 1.032 5 2014 10 519.552 0.549 3 2014 11 518.840 0.876 1 2014 12 519.151 0.725 5 2015 1 519.152 0.875 4 2015 2 518.714 1.021 4 2015 3 518.300 1.003 1 2015 4 nan nan 0 2015 5 nan nan 0 2015 6 519.001 2.788 3 2015 7 517.886 2.456 2 2015 8 nan nan 0 2015 9 518.415 1.325 3 2015 10 517.351 2.643 2 2015 11 517.376 1.712 4 2015 12 516.850 0.957 1 2016 1 nan nan 0 2016 2 nan nan 0 2016 3 514.480 5.983 1 2016 4 nan nan 0 2016 5 nan nan 0 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 nan nan 0 2017 1 nan nan 0 2017 2 512.573 2.216 2 2017 3 513.300 3.186 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