# file: thd_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: THD -- Trinidad Head, California -- 41.05 N, 124.15 W, 107 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 "thd_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 # F12ottoTHDyr F12ottoTHDmon F12ottoTHDm F12ottoTHDsd F12ottoTHDn 2002 1 nan nan 0 2002 2 547.740 2.062 1 2002 3 545.995 1.179 4 2002 4 547.438 1.101 6 2002 5 545.764 0.763 8 2002 6 546.150 0.634 4 2002 7 545.093 0.823 5 2002 8 545.307 1.010 4 2002 9 545.840 0.747 4 2002 10 547.543 1.032 5 2002 11 547.449 0.623 3 2002 12 547.168 1.008 3 2003 1 546.500 1.273 4 2003 2 546.157 0.910 3 2003 3 545.934 0.901 4 2003 4 546.521 1.167 4 2003 5 544.651 1.977 6 2003 6 544.351 1.034 6 2003 7 545.097 0.879 5 2003 8 543.350 0.817 3 2003 9 545.152 0.827 4 2003 10 545.110 1.300 5 2003 11 545.680 0.997 3 2003 12 545.353 0.743 4 2004 1 546.255 0.758 4 2004 2 545.583 0.808 4 2004 3 546.010 1.200 5 2004 4 545.637 0.641 4 2004 5 544.804 1.057 3 2004 6 544.568 0.994 5 2004 7 544.509 0.937 4 2004 8 543.559 0.791 3 2004 9 543.514 1.624 5 2004 10 543.811 1.155 3 2004 11 545.788 1.053 2 2004 12 544.101 1.105 5 2005 1 544.879 0.624 3 2005 2 545.189 0.932 3 2005 3 544.574 1.046 4 2005 4 544.130 1.294 4 2005 5 543.518 1.178 4 2005 6 543.035 0.859 4 2005 7 542.664 1.010 4 2005 8 543.004 1.164 5 2005 9 542.782 0.999 4 2005 10 543.460 1.289 4 2005 11 543.839 1.206 3 2005 12 543.823 1.141 3 2006 1 544.149 1.474 3 2006 2 543.126 1.649 3 2006 3 542.580 1.118 2 2006 4 543.024 1.277 3 2006 5 541.629 1.163 5 2006 6 541.859 0.973 4 2006 7 541.565 0.752 4 2006 8 540.665 0.677 5 2006 9 541.553 0.967 4 2006 10 541.153 0.787 4 2006 11 541.089 1.058 5 2006 12 541.294 0.999 3 2007 1 540.840 1.234 3 2007 2 540.888 1.003 4 2007 3 540.413 0.976 4 2007 4 540.531 1.235 4 2007 5 540.190 0.717 1 2007 6 539.700 0.913 4 2007 7 538.748 0.783 4 2007 8 539.294 0.778 3 2007 9 539.538 1.015 3 2007 10 539.095 1.360 4 2007 11 537.151 0.983 2 2007 12 538.566 1.158 3 2008 1 538.697 1.537 3 2008 2 538.003 1.330 4 2008 3 537.838 1.505 3 2008 4 537.209 1.359 4 2008 5 536.749 0.727 4 2008 6 536.718 1.039 5 2008 7 536.599 0.799 4 2008 8 535.640 0.707 4 2008 9 536.127 1.014 2 2008 10 535.502 0.777 3 2008 11 536.686 0.578 5 2008 12 537.334 1.137 3 2009 1 536.604 1.141 4 2009 2 536.060 0.962 5 2009 3 535.778 1.245 3 2009 4 534.389 1.441 4 2009 5 534.101 0.667 3 2009 6 534.377 1.099 4 2009 7 533.213 1.122 4 2009 8 533.089 0.823 5 2009 9 532.729 0.811 3 2009 10 533.042 0.910 3 2009 11 532.386 0.887 4 2009 12 533.154 1.009 4 2010 1 532.800 1.394 1 2010 2 533.070 0.787 3 2010 3 532.520 1.213 1 2010 4 531.894 1.404 4 2010 5 530.638 0.901 4 2010 6 530.287 1.115 4 2010 7 530.383 0.931 5 2010 8 530.624 0.915 3 2010 9 530.443 0.929 2 2010 10 530.442 0.996 5 2010 11 529.344 1.169 2 2010 12 530.344 0.875 4 2011 1 530.609 0.935 3 2011 2 529.469 1.694 4 2011 3 528.797 1.096 4 2011 4 529.122 0.929 4 2011 5 529.996 1.112 4 2011 6 528.752 0.897 3 2011 7 528.187 0.938 5 2011 8 527.755 1.407 4 2011 9 527.965 0.928 4 2011 10 528.444 0.643 3 2011 11 528.127 1.114 4 2011 12 528.184 0.580 5 2012 1 528.436 1.417 2 2012 2 527.519 1.537 4 2012 3 527.202 1.371 2 2012 4 526.721 0.820 3 2012 5 526.103 0.701 4 2012 6 525.214 0.791 5 2012 7 524.583 1.901 3 2012 8 523.284 0.817 3 2012 9 525.080 0.836 5 2012 10 524.313 0.975 4 2012 11 524.118 1.198 4 2012 12 524.476 0.810 3 2013 1 524.820 1.035 1 2013 2 524.476 0.665 4 2013 3 524.023 0.710 5 2013 4 523.769 0.824 4 2013 5 523.331 0.668 4 2013 6 522.944 0.655 4 2013 7 521.614 0.782 3 2013 8 522.302 0.870 4 2013 9 522.844 0.812 4 2013 10 522.760 1.243 3 2013 11 521.931 1.069 2 2013 12 521.696 0.733 5 2014 1 521.734 0.893 2 2014 2 521.375 1.165 4 2014 3 521.381 0.813 4 2014 4 521.336 0.831 4 2014 5 521.657 0.821 2 2014 6 521.271 1.249 3 2014 7 520.596 0.808 4 2014 8 520.174 0.691 5 2014 9 520.766 0.608 4 2014 10 519.890 0.636 5 2014 11 520.193 0.499 4 2014 12 520.102 0.826 4 2015 1 519.899 1.018 3 2015 2 519.189 1.855 5 2015 3 nan nan 0 2015 4 nan nan 0 2015 5 nan nan 0 2015 6 519.410 3.328 1 2015 7 518.585 2.326 3 2015 8 519.134 3.087 3 2015 9 517.299 1.299 3 2015 10 516.833 2.149 3 2015 11 517.355 1.058 2 2015 12 nan nan 0 2016 1 nan nan 0 2016 2 515.680 3.039 1 2016 3 516.096 2.774 3 2016 4 nan nan 0 2016 5 nan nan 0 2016 6 nan nan 0 2016 7 nan nan 0 2016 8 513.520 3.002 1 2016 9 nan nan 0 2016 10 nan nan 0 2016 11 nan nan 0 2016 12 513.370 2.152 1 2017 1 512.530 1.674 1 2017 2 514.360 3.945 1 2017 3 513.350 6.187 1 2017 4 nan nan 0 2017 5 511.980 9.120 1 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