# file: brw_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: BRW -- Barrow, Alaska -- 71.32 N, 156.61 W, 11 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 "brw_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 # F12ottoBRWyr F12ottoBRWmon F12ottoBRWm F12ottoBRWsd F12ottoBRWn 1995 1 nan nan 0 1995 2 530.810 6.018 1 1995 3 nan nan 0 1995 4 532.820 3.173 1 1995 5 nan nan 0 1995 6 nan nan 0 1995 7 nan nan 0 1995 8 531.977 0.686 2 1995 9 531.524 1.527 2 1995 10 533.288 1.493 3 1995 11 534.260 1.579 1 1995 12 535.150 0.899 1 1996 1 535.771 1.314 4 1996 2 535.410 1.211 4 1996 3 534.575 1.819 2 1996 4 534.296 1.142 4 1996 5 534.141 0.761 5 1996 6 533.982 0.766 3 1996 7 534.197 1.263 4 1996 8 535.156 0.787 3 1996 9 534.933 0.881 4 1996 10 535.977 0.725 4 1996 11 537.418 1.054 4 1996 12 537.849 0.648 4 1997 1 537.717 0.877 3 1997 2 537.315 1.280 4 1997 3 538.023 0.693 4 1997 4 537.211 1.150 4 1997 5 537.562 1.050 5 1997 6 536.744 0.985 4 1997 7 537.010 0.992 3 1997 8 537.140 0.764 5 1997 9 nan nan 0 1997 10 539.914 1.156 4 1997 11 541.746 1.399 3 1997 12 540.574 1.138 4 1998 1 541.125 1.216 4 1998 2 540.066 1.578 2 1998 3 540.316 1.000 3 1998 4 540.591 1.016 4 1998 5 541.115 1.163 4 1998 6 540.030 0.834 2 1998 7 540.360 1.433 5 1998 8 539.421 1.639 4 1998 9 540.766 1.704 3 1998 10 541.312 2.096 3 1998 11 541.535 0.815 4 1998 12 542.042 0.904 4 1999 1 543.479 1.632 5 1999 2 543.536 1.220 3 1999 3 542.269 1.255 3 1999 4 544.086 1.082 4 1999 5 542.255 1.114 4 1999 6 542.478 0.911 3 1999 7 541.557 1.338 4 1999 8 541.094 0.864 4 1999 9 541.161 0.818 3 1999 10 542.562 0.868 5 1999 11 543.721 0.895 2 1999 12 544.397 0.676 4 2000 1 545.285 1.073 3 2000 2 545.822 1.260 4 2000 3 544.976 0.789 4 2000 4 545.279 1.285 3 2000 5 545.435 0.821 4 2000 6 545.942 1.534 3 2000 7 544.614 1.162 3 2000 8 544.479 1.156 4 2000 9 544.562 0.879 4 2000 10 545.991 0.852 4 2000 11 545.763 0.737 4 2000 12 546.411 1.039 5 2001 1 546.475 1.005 3 2001 2 546.826 1.091 4 2001 3 546.663 0.698 3 2001 4 545.214 0.918 3 2001 5 545.787 0.789 4 2001 6 544.987 0.914 5 2001 7 544.071 0.864 3 2001 8 544.368 0.849 4 2001 9 543.785 0.798 4 2001 10 544.492 0.957 3 2001 11 546.229 0.860 5 2001 12 547.190 1.627 1 2002 1 546.351 0.919 4 2002 2 546.332 0.846 3 2002 3 546.849 1.161 5 2002 4 546.590 1.016 1 2002 5 545.969 1.331 4 2002 6 545.689 0.767 3 2002 7 545.352 0.866 3 2002 8 544.943 1.008 3 2002 9 544.364 0.701 2 2002 10 545.323 0.811 4 2002 11 546.377 0.678 5 2002 12 545.611 1.158 2 2003 1 545.251 1.358 3 2003 2 546.179 0.842 5 2003 3 546.446 0.789 3 2003 4 546.566 0.756 3 2003 5 544.789 1.331 6 2003 6 544.065 0.864 4 2003 7 544.616 0.794 3 2003 8 543.626 0.987 5 2003 9 543.882 0.838 4 2003 10 544.442 1.172 5 2003 11 545.429 0.801 4 2003 12 546.490 0.536 3 2004 1 545.773 1.133 4 2004 2 546.666 0.925 3 2004 3 545.721 0.726 5 2004 4 545.671 0.822 5 2004 5 544.559 1.353 2 2004 6 543.600 0.982 4 2004 7 543.724 0.897 3 2004 8 542.916 0.546 4 2004 9 542.038 0.621 4 2004 10 542.014 1.129 4 2004 11 544.563 1.582 2 2004 12 nan nan 0 2005 1 543.956 1.142 4 2005 2 545.010 1.111 4 2005 3 544.621 0.905 5 2005 4 543.810 0.983 4 2005 5 543.688 1.016 4 2005 6 543.004 0.993 5 2005 7 541.872 0.749 4 2005 8 542.227 1.031 3 2005 9 541.753 0.637 5 2005 10 542.983 0.990 4 2005 11 543.144 1.152 4 2005 12 543.642 1.284 5 2006 1 543.755 1.289 3 2006 2 543.133 1.975 4 2006 3 543.747 1.052 3 2006 4 542.741 1.057 4 2006 5 542.358 0.669 4 2006 6 541.887 0.846 4 2006 7 540.352 0.907 4 2006 8 540.252 0.565 5 2006 9 540.335 1.014 4 2006 10 539.986 1.287 4 2006 11 540.500 0.997 4 2006 12 541.181 0.843 4 2007 1 540.958 0.905 2 2007 2 540.929 1.468 3 2007 3 540.279 1.036 4 2007 4 540.135 0.941 2 2007 5 540.923 0.773 2 2007 6 539.344 0.809 3 2007 7 537.951 0.621 2 2007 8 539.082 1.091 2 2007 9 538.297 0.793 4 2007 10 538.456 0.872 4 2007 11 537.644 1.020 2 2007 12 538.965 1.337 3 2008 1 537.980 1.237 2 2008 2 538.419 1.428 4 2008 3 nan nan 0 2008 4 537.123 1.140 2 2008 5 536.387 0.908 5 2008 6 536.540 0.839 4 2008 7 535.856 0.930 4 2008 8 535.483 0.857 2 2008 9 535.063 0.872 2 2008 10 535.308 0.573 4 2008 11 535.628 0.851 3 2008 12 536.323 1.145 2 2009 1 536.116 1.102 2 2009 2 535.501 0.981 3 2009 3 535.319 1.244 3 2009 4 534.663 1.384 2 2009 5 534.563 0.893 4 2009 6 534.142 0.998 4 2009 7 532.917 0.946 4 2009 8 533.229 1.236 4 2009 9 531.772 0.921 4 2009 10 532.024 0.736 3 2009 11 532.359 0.823 5 2009 12 532.807 0.865 4 2010 1 532.295 0.803 5 2010 2 532.924 1.102 4 2010 3 532.740 1.253 1 2010 4 532.572 1.255 5 2010 5 530.901 0.934 4 2010 6 531.174 0.930 4 2010 7 531.256 0.836 5 2010 8 529.636 0.931 4 2010 9 529.370 1.007 3 2010 10 529.686 0.770 4 2010 11 529.348 0.872 4 2010 12 530.179 1.146 4 2011 1 530.101 1.221 3 2011 2 529.953 1.445 3 2011 3 530.083 1.175 4 2011 4 nan nan 0 2011 5 529.501 0.890 3 2011 6 528.615 0.855 4 2011 7 527.626 0.925 5 2011 8 527.463 0.781 3 2011 9 527.059 0.996 3 2011 10 528.312 0.997 4 2011 11 527.457 0.794 5 2011 12 527.918 1.261 2 2012 1 527.104 0.657 2 2012 2 527.141 0.934 4 2012 3 526.923 1.181 2 2012 4 527.053 1.056 3 2012 5 526.230 0.870 5 2012 6 525.008 0.744 4 2012 7 523.760 0.703 4 2012 8 523.378 0.756 5 2012 9 523.477 0.701 3 2012 10 524.059 0.707 4 2012 11 524.500 0.697 5 2012 12 524.391 1.065 5 2013 1 524.298 0.837 4 2013 2 524.265 0.946 4 2013 3 524.112 0.929 4 2013 4 523.827 0.736 4 2013 5 523.115 0.803 4 2013 6 523.363 0.883 4 2013 7 523.145 0.849 4 2013 8 521.048 0.689 4 2013 9 520.872 0.958 4 2013 10 521.471 0.785 5 2013 11 521.600 0.598 4 2013 12 521.766 0.722 5 2014 1 521.331 0.665 4 2014 2 521.524 0.649 3 2014 3 521.676 0.685 5 2014 4 521.625 0.726 3 2014 5 521.161 0.738 4 2014 6 520.967 0.744 5 2014 7 520.361 1.019 4 2014 8 519.914 0.845 3 2014 9 519.943 0.776 4 2014 10 519.461 0.786 4 2014 11 519.257 0.702 3 2014 12 519.448 0.531 5 2015 1 519.748 1.036 3 2015 2 519.325 2.129 3 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 nan nan 0 2015 9 516.350 3.181 1 2015 10 517.032 1.320 5 2015 11 516.768 1.075 5 2015 12 516.500 1.639 1 2016 1 516.050 3.133 1 2016 2 514.200 2.680 1 2016 3 514.706 2.931 2 2016 4 nan nan 0 2016 5 nan nan 0 2016 6 515.170 8.421 1 2016 7 514.121 1.590 2 2016 8 nan nan 0 2016 9 nan nan 0 2016 10 nan nan 0 2016 11 nan nan 0 2016 12 513.550 2.854 1 2017 1 nan nan 0 2017 2 511.361 4.212 2 2017 3 509.540 4.952 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