# file: alt_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: ALT -- Alert, Canada -- 82.45 N, 62.51 W, 200 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 "alt_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 # F12ottoALTyr F12ottoALTmon F12ottoALTm F12ottoALTsd F12ottoALTn 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 12 533.070 2.071 1 1995 1 530.908 2.058 2 1995 2 531.762 4.322 2 1995 3 533.610 4.106 1 1995 4 nan nan 0 1995 5 nan nan 0 1995 6 nan nan 0 1995 7 532.340 4.707 1 1995 8 531.701 0.846 4 1995 9 532.155 1.380 4 1995 10 534.130 1.357 1 1995 11 535.278 1.180 4 1995 12 535.914 1.181 2 1996 1 537.222 1.819 2 1996 2 534.582 1.216 5 1996 3 nan nan 0 1996 4 534.466 0.740 2 1996 5 534.299 1.311 3 1996 6 535.601 1.862 3 1996 7 535.038 0.958 3 1996 8 535.317 1.095 4 1996 9 535.640 0.843 1 1996 10 538.475 1.084 2 1996 11 537.427 0.990 3 1996 12 nan nan 0 1997 1 539.527 0.861 2 1997 2 537.928 1.939 4 1997 3 538.684 1.875 2 1997 4 538.240 1.050 1 1997 5 539.660 1.029 1 1997 6 537.190 0.784 4 1997 7 537.540 0.891 2 1997 8 nan nan 0 1997 9 nan nan 0 1997 10 nan nan 0 1997 11 nan nan 0 1997 12 540.480 1.855 1 1998 1 541.060 1.155 3 1998 2 541.530 1.756 1 1998 3 539.210 1.299 1 1998 4 540.294 0.923 3 1998 5 540.409 0.574 2 1998 6 540.859 0.990 2 1998 7 540.370 1.392 3 1998 8 540.938 0.937 3 1998 9 538.885 1.026 4 1998 10 541.740 0.898 3 1998 11 542.067 1.688 4 1998 12 543.140 1.228 3 1999 1 543.514 1.244 2 1999 2 544.032 1.174 4 1999 3 544.020 1.350 3 1999 4 542.900 1.120 1 1999 5 542.170 1.204 3 1999 6 541.175 0.708 3 1999 7 541.112 0.778 4 1999 8 541.391 1.070 3 1999 9 543.380 0.876 2 1999 10 542.834 0.949 4 1999 11 542.009 1.096 3 1999 12 nan nan 0 2000 1 544.310 1.054 4 2000 2 544.789 1.226 3 2000 3 545.737 1.077 3 2000 4 545.655 1.468 2 2000 5 545.315 1.138 3 2000 6 545.930 1.603 1 2000 7 543.829 0.953 2 2000 8 nan nan 0 2000 9 544.120 0.911 1 2000 10 nan nan 0 2000 11 546.121 0.765 4 2000 12 546.233 0.972 3 2001 1 nan nan 0 2001 2 546.975 0.680 4 2001 3 546.326 0.742 3 2001 4 nan nan 0 2001 5 546.513 1.015 3 2001 6 546.502 0.884 3 2001 7 544.976 1.039 4 2001 8 544.086 1.235 4 2001 9 544.236 1.081 3 2001 10 544.757 0.719 4 2001 11 545.785 1.102 4 2001 12 546.295 1.117 4 2002 1 546.907 0.818 4 2002 2 545.793 1.247 2 2002 3 546.391 1.329 4 2002 4 547.486 1.631 2 2002 5 nan nan 0 2002 6 nan nan 0 2002 7 nan nan 0 2002 8 nan nan 0 2002 9 nan nan 0 2002 10 545.676 0.534 3 2002 11 546.643 0.828 4 2002 12 547.198 0.962 4 2003 1 546.252 0.991 3 2003 2 nan nan 0 2003 3 nan nan 0 2003 4 544.470 1.301 1 2003 5 544.597 0.928 4 2003 6 545.097 0.660 4 2003 7 544.653 0.757 5 2003 8 544.010 0.948 3 2003 9 545.059 0.724 4 2003 10 544.730 0.812 5 2003 11 546.331 0.712 4 2003 12 545.970 0.871 4 2004 1 545.850 0.730 5 2004 2 546.126 0.797 4 2004 3 546.274 0.829 4 2004 4 545.356 1.028 4 2004 5 544.539 1.353 4 2004 6 544.185 0.950 5 2004 7 543.354 0.977 4 2004 8 543.922 0.621 4 2004 9 543.097 0.830 4 2004 10 545.241 1.462 3 2004 11 544.389 1.081 4 2004 12 544.846 0.902 4 2005 1 546.003 0.881 4 2005 2 544.478 1.196 4 2005 3 544.993 1.271 4 2005 4 544.478 0.931 4 2005 5 543.019 1.159 4 2005 6 543.228 0.806 5 2005 7 543.010 0.955 4 2005 8 542.112 0.907 5 2005 9 543.568 0.909 4 2005 10 542.943 0.838 4 2005 11 544.087 1.643 4 2005 12 543.295 1.157 3 2006 1 543.380 1.256 1 2006 2 542.884 1.173 5 2006 3 543.406 1.251 4 2006 4 542.951 1.006 4 2006 5 542.801 0.640 5 2006 6 542.118 0.978 4 2006 7 541.647 0.870 4 2006 8 540.726 0.770 4 2006 9 539.432 0.904 4 2006 10 540.428 0.744 4 2006 11 540.809 1.097 5 2006 12 541.222 0.919 4 2007 1 541.009 1.137 4 2007 2 540.468 0.706 4 2007 3 540.061 1.276 4 2007 4 541.744 0.763 4 2007 5 539.467 0.806 4 2007 6 538.861 0.566 4 2007 7 539.671 1.069 4 2007 8 539.084 0.877 5 2007 9 538.956 1.804 4 2007 10 538.281 1.788 4 2007 11 538.260 0.998 4 2007 12 539.184 1.229 4 2008 1 537.603 1.569 5 2008 2 538.552 1.152 3 2008 3 538.087 1.329 4 2008 4 537.552 0.959 3 2008 5 537.335 0.950 4 2008 6 536.948 0.807 4 2008 7 535.156 0.930 5 2008 8 536.878 0.723 4 2008 9 535.360 0.676 3 2008 10 536.591 1.762 5 2008 11 537.033 1.454 3 2008 12 537.275 1.361 3 2009 1 536.319 1.328 3 2009 2 535.943 0.842 4 2009 3 535.487 0.973 4 2009 4 535.550 0.955 4 2009 5 534.392 0.939 4 2009 6 532.911 0.710 5 2009 7 533.493 0.798 4 2009 8 533.200 0.822 4 2009 9 533.667 1.258 4 2009 10 533.608 0.881 4 2009 11 533.287 0.948 4 2009 12 533.908 1.019 5 2010 1 533.191 0.956 2 2010 2 533.310 1.025 1 2010 3 533.687 1.073 3 2010 4 532.885 0.933 4 2010 5 531.789 0.860 4 2010 6 531.963 1.109 4 2010 7 530.258 0.919 4 2010 8 529.270 0.941 3 2010 9 529.547 0.711 3 2010 10 529.248 0.837 4 2010 11 529.552 1.181 2 2010 12 529.996 1.113 5 2011 1 530.249 1.183 4 2011 2 529.464 2.056 4 2011 3 529.260 1.236 5 2011 4 530.376 0.937 4 2011 5 529.457 0.614 5 2011 6 529.125 0.811 4 2011 7 nan nan 0 2011 8 526.800 1.108 1 2011 9 528.364 0.768 5 2011 10 527.854 0.926 4 2011 11 526.855 0.781 4 2011 12 527.628 0.656 5 2012 1 527.807 0.779 4 2012 2 527.120 1.714 4 2012 3 527.348 0.631 5 2012 4 527.026 0.831 4 2012 5 526.357 0.920 4 2012 6 525.476 0.981 4 2012 7 523.886 0.642 4 2012 8 524.183 0.875 5 2012 9 523.641 0.844 4 2012 10 523.755 0.865 4 2012 11 524.215 0.763 5 2012 12 523.949 1.012 4 2013 1 524.254 0.934 5 2013 2 524.873 0.765 4 2013 3 524.089 0.938 3 2013 4 nan nan 0 2013 5 524.010 1.123 1 2013 6 524.820 1.347 1 2013 7 521.790 0.961 1 2013 8 521.813 1.062 3 2013 9 520.779 0.830 3 2013 10 520.943 0.922 4 2013 11 521.564 0.624 3 2013 12 521.565 0.779 4 2014 1 521.329 0.795 5 2014 2 522.192 0.709 3 2014 3 nan nan 0 2014 4 nan nan 0 2014 5 522.260 1.223 1 2014 6 nan nan 0 2014 7 521.628 0.871 3 2014 8 520.024 0.737 4 2014 9 519.413 0.786 5 2014 10 519.265 0.626 4 2014 11 518.621 0.931 4 2014 12 519.200 1.406 3 2015 1 519.211 0.566 4 2015 2 519.840 2.383 1 2015 3 519.650 2.479 1 2015 4 nan nan 0 2015 5 nan nan 0 2015 6 nan nan 0 2015 7 nan nan 0 2015 8 518.053 1.717 4 2015 9 516.195 2.500 2 2015 10 516.544 1.607 4 2015 11 516.870 1.551 1 2015 12 nan nan 0 2016 1 nan nan 0 2016 2 514.316 2.671 3 2016 3 514.321 5.807 2 2016 4 513.780 4.835 1 2016 5 514.117 4.274 4 2016 6 513.198 2.764 3 2016 7 nan nan 0 2016 8 512.430 1.873 1 2016 9 nan nan 0 2016 10 511.940 3.611 1 2016 11 nan nan 0 2016 12 nan nan 0 2017 1 nan nan 0 2017 2 nan nan 0 2017 3 nan nan 0 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