# file: hfm_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: HFM -- Harvard Forest, Massachusetts -- 42.54 N, 72.17 W, 340 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 "hfm_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 # F12ottoHFMyr F12ottoHFMmon F12ottoHFMm F12ottoHFMsd F12ottoHFMn 1995 1 nan nan 0 1995 2 nan nan 0 1995 3 nan nan 0 1995 4 nan nan 0 1995 5 nan nan 0 1995 6 nan nan 0 1995 7 nan nan 0 1995 8 nan nan 0 1995 9 571.230 6.318 1 1995 10 nan nan 0 1995 11 542.123 3.048 2 1995 12 nan nan 0 1996 1 539.890 1.314 1 1996 2 556.130 52.714 1 1996 3 nan nan 0 1996 4 551.922 8.429 2 1996 5 572.420 5.427 1 1996 6 538.267 15.988 2 1996 7 nan nan 0 1996 8 573.170 1.630 1 1996 9 540.071 0.680 3 1996 10 543.780 12.980 1 1996 11 541.176 5.685 2 1996 12 nan nan 0 1997 1 540.322 1.499 2 1997 2 539.590 1.944 1 1997 3 543.630 1.734 1 1997 4 536.620 1.069 1 1997 5 540.632 4.002 2 1997 6 543.260 0.675 1 1997 7 540.400 1.400 1 1997 8 539.418 1.662 2 1997 9 548.510 1.903 1 1997 10 550.941 7.686 2 1997 11 nan nan 0 1997 12 548.975 5.848 2 1998 1 583.550 2.022 1 1998 2 542.306 1.030 2 1998 3 nan nan 0 1998 4 549.850 15.124 1 1998 5 546.080 0.728 1 1998 6 585.440 1.091 1 1998 7 574.924 16.468 3 1998 8 545.443 9.044 2 1998 9 552.342 6.682 3 1998 10 550.738 11.186 2 1998 11 541.200 1.348 1 1998 12 552.910 1.556 1 1999 1 544.743 0.956 2 1999 2 553.688 10.021 3 1999 3 543.860 1.135 1 1999 4 546.010 2.378 1 1999 5 549.120 12.594 3 1999 6 542.850 1.052 1 1999 7 556.990 0.709 1 1999 8 nan nan 0 1999 9 550.020 1.060 1 1999 10 nan nan 0 1999 11 561.897 2.920 2 1999 12 548.421 1.596 3 2000 1 548.730 1.098 1 2000 2 546.372 1.717 3 2000 3 552.234 5.841 2 2000 4 546.230 1.826 1 2000 5 552.098 4.572 3 2000 6 555.455 1.787 2 2000 7 560.530 3.814 1 2000 8 547.030 3.253 2 2000 9 549.168 7.099 2 2000 10 553.180 1.267 1 2000 11 553.878 4.716 2 2000 12 546.840 0.826 1 2001 1 550.736 6.131 2 2001 2 547.733 6.357 2 2001 3 546.300 1.315 1 2001 4 546.361 0.798 2 2001 5 552.114 6.180 2 2001 6 549.809 10.457 3 2001 7 544.962 0.785 2 2001 8 548.250 2.205 1 2001 9 545.510 0.953 1 2001 10 552.057 7.261 3 2001 11 554.223 3.564 2 2001 12 551.722 3.472 2 2002 1 546.590 1.442 2 2002 2 557.015 9.058 2 2002 3 547.608 1.379 2 2002 4 555.853 8.920 4 2002 5 554.240 0.947 2 2002 6 554.767 11.491 2 2002 7 548.530 4.799 3 2002 8 556.685 17.663 2 2002 9 545.320 0.990 2 2002 10 547.420 1.425 3 2002 11 552.750 0.754 1 2002 12 548.058 2.722 2 2003 1 545.248 4.681 2 2003 2 547.323 1.168 2 2003 3 553.558 4.271 2 2003 4 550.375 7.686 2 2003 5 549.442 2.957 4 2003 6 551.246 7.647 6 2003 7 549.350 1.152 1 2003 8 553.600 6.859 2 2003 9 545.990 0.806 1 2003 10 554.203 12.489 3 2003 11 551.767 5.254 2 2003 12 555.120 1.571 1 2004 1 557.640 1.476 1 2004 2 547.285 1.471 2 2004 3 548.297 0.822 2 2004 4 546.734 0.905 2 2004 5 551.709 2.114 2 2004 6 548.650 0.801 1 2004 7 547.870 0.996 1 2004 8 545.320 0.520 1 2004 9 547.348 6.760 2 2004 10 544.726 2.089 3 2004 11 548.409 2.157 2 2004 12 nan nan 0 2005 1 544.546 1.099 2 2005 2 546.914 7.097 3 2005 3 544.600 1.644 2 2005 4 546.356 1.657 4 2005 5 545.015 1.071 5 2005 6 547.611 2.599 3 2005 7 544.219 1.761 2 2005 8 548.499 3.390 3 2005 9 551.811 12.923 3 2005 10 547.700 1.426 1 2005 11 545.220 1.642 1 2005 12 544.200 2.120 1 2006 1 548.221 3.769 2 2006 2 554.390 1.756 1 2006 3 544.110 3.239 2 2006 4 544.100 1.745 1 2006 5 546.722 3.069 5 2006 6 543.985 4.979 4 2006 7 542.399 1.622 4 2006 8 542.492 1.649 4 2006 9 543.614 2.434 4 2006 10 543.548 1.354 5 2006 11 542.790 1.852 4 2006 12 543.149 1.087 4 2007 1 542.205 1.600 4 2007 2 541.062 0.954 5 2007 3 540.416 1.179 3 2007 4 541.487 1.199 5 2007 5 546.036 6.846 4 2007 6 540.780 0.936 4 2007 7 541.360 3.405 4 2007 8 540.701 2.008 3 2007 9 540.924 3.791 3 2007 10 541.624 4.824 4 2007 11 540.750 1.886 3 2007 12 538.554 2.341 2 2008 1 539.314 0.885 4 2008 2 538.367 1.507 3 2008 3 539.154 1.604 3 2008 4 537.961 1.225 5 2008 5 536.809 0.904 4 2008 6 537.639 1.748 3 2008 7 537.092 1.005 4 2008 8 537.124 1.495 3 2008 9 537.655 2.246 4 2008 10 536.822 1.294 5 2008 11 535.730 0.859 3 2008 12 539.077 2.263 2 2009 1 537.402 1.784 4 2009 2 536.031 1.208 4 2009 3 536.109 0.918 5 2009 4 535.257 1.448 4 2009 5 535.783 1.366 4 2009 6 534.823 0.720 4 2009 7 534.272 0.889 5 2009 8 535.477 1.831 4 2009 9 533.716 1.565 5 2009 10 532.748 0.736 4 2009 11 533.236 0.980 3 2009 12 532.736 0.890 3 2010 1 532.443 1.057 4 2010 2 532.326 1.009 4 2010 3 533.238 1.171 4 2010 4 533.392 1.284 3 2010 5 534.574 3.669 4 2010 6 530.917 1.585 4 2010 7 533.013 3.516 4 2010 8 530.921 1.110 3 2010 9 533.322 2.921 3 2010 10 531.038 1.124 4 2010 11 531.043 2.061 5 2010 12 530.302 1.295 3 2011 1 531.255 0.967 3 2011 2 530.385 1.115 4 2011 3 529.906 1.349 3 2011 4 530.001 1.540 4 2011 5 529.277 1.060 3 2011 6 528.110 0.677 4 2011 7 528.921 0.829 3 2011 8 527.776 1.270 4 2011 9 529.162 1.487 5 2011 10 529.332 0.950 4 2011 11 530.137 0.823 5 2011 12 529.403 1.408 2 2012 1 527.527 1.187 4 2012 2 528.005 1.310 3 2012 3 526.643 1.100 3 2012 4 526.596 0.872 5 2012 5 526.455 1.225 4 2012 6 526.070 1.355 1 2012 7 525.639 0.569 4 2012 8 525.108 0.978 3 2012 9 523.935 0.929 3 2012 10 524.649 0.914 3 2012 11 524.986 0.915 3 2012 12 524.057 0.942 2 2013 1 529.695 3.232 2 2013 2 523.981 0.661 4 2013 3 525.143 0.893 2 2013 4 523.698 0.896 4 2013 5 524.538 2.086 2 2013 6 523.470 1.117 1 2013 7 523.833 1.257 4 2013 8 522.642 1.550 4 2013 9 523.060 0.912 1 2013 10 524.003 1.916 2 2013 11 523.011 1.541 3 2013 12 523.680 1.820 3 2014 1 521.739 0.954 3 2014 2 520.950 0.865 1 2014 3 521.684 0.833 4 2014 4 521.444 0.878 4 2014 5 522.051 0.622 2 2014 6 521.515 1.329 2 2014 7 522.160 0.924 4 2014 8 520.306 0.711 4 2014 9 520.670 0.791 4 2014 10 520.462 0.665 4 2014 11 520.677 2.218 3 2014 12 520.515 0.943 3 2015 1 519.438 0.972 4 2015 2 518.497 3.686 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 8 520.000 3.417 1 2015 9 518.910 1.469 4 2015 10 517.830 2.883 2 2015 11 517.215 1.166 4 2015 12 517.276 1.942 2 2016 1 517.126 7.006 3 2016 2 nan nan 0 2016 3 514.112 1.706 2 2016 4 515.292 2.583 2 2016 5 514.396 4.324 2 2016 6 nan nan 0 2016 7 512.850 2.068 1 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 2 512.720 2.030 1 2017 3 512.800 8.583 1 2017 4 512.880 3.769 1 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