# file: mhd_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: MHD -- Mace Head, Ireland -- 53.33 N, 9.90 W, 25 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 "mhd_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 # F12ottoMHDyr F12ottoMHDmon F12ottoMHDm F12ottoMHDsd F12ottoMHDn 1998 1 nan nan 0 1998 2 nan nan 0 1998 3 nan nan 0 1998 4 nan nan 0 1998 5 nan nan 0 1998 6 nan nan 0 1998 7 nan nan 0 1998 8 nan nan 0 1998 9 nan nan 0 1998 10 543.830 1.192 1 1998 11 543.129 1.690 2 1998 12 545.030 1.271 1 1999 1 nan nan 0 1999 2 543.490 1.318 1 1999 3 nan nan 0 1999 4 541.540 0.523 1 1999 5 nan nan 0 1999 6 542.090 1.290 1 1999 7 542.535 1.025 2 1999 8 542.640 0.953 1 1999 9 nan nan 0 1999 10 nan nan 0 1999 11 nan nan 0 1999 12 nan nan 0 2000 1 nan nan 0 2000 2 nan nan 0 2000 3 nan nan 0 2000 4 nan nan 0 2000 5 nan nan 0 2000 6 nan nan 0 2000 7 nan nan 0 2000 8 nan nan 0 2000 9 nan nan 0 2000 10 nan nan 0 2000 11 nan nan 0 2000 12 nan nan 0 2001 1 nan nan 0 2001 2 nan nan 0 2001 3 nan nan 0 2001 4 nan nan 0 2001 5 546.080 0.917 1 2001 6 nan nan 0 2001 7 545.360 0.950 1 2001 8 544.260 0.813 2 2001 9 545.150 1.414 2 2001 10 545.630 0.651 1 2001 11 nan nan 0 2001 12 nan nan 0 2002 1 546.870 0.841 1 2002 2 546.225 0.928 3 2002 3 547.000 1.661 1 2002 4 546.067 1.339 2 2002 5 nan nan 0 2002 6 nan nan 0 2002 7 nan nan 0 2002 8 nan nan 0 2002 9 543.550 0.856 1 2002 10 545.177 1.061 2 2002 11 546.835 0.867 2 2002 12 545.470 1.184 1 2003 1 545.332 1.338 2 2003 2 546.427 0.902 2 2003 3 546.376 1.112 3 2003 4 nan nan 0 2003 5 546.305 1.421 2 2003 6 543.653 0.958 2 2003 7 544.534 0.950 2 2003 8 543.180 0.764 1 2003 9 544.720 0.904 3 2003 10 546.500 1.962 1 2003 11 545.633 1.595 3 2003 12 546.269 0.902 2 2004 1 544.942 0.761 2 2004 2 546.210 0.876 2 2004 3 545.431 0.606 2 2004 4 545.033 0.924 2 2004 5 544.836 1.288 2 2004 6 544.398 0.833 2 2004 7 544.622 0.947 2 2004 8 542.649 0.584 2 2004 9 542.370 0.599 2 2004 10 543.050 1.387 1 2004 11 nan nan 0 2004 12 544.158 1.161 2 2005 1 544.192 1.761 2 2005 2 544.540 1.022 2 2005 3 544.150 1.788 1 2005 4 544.837 1.566 2 2005 5 543.441 1.351 3 2005 6 543.370 1.521 1 2005 7 542.869 1.076 2 2005 8 540.995 1.010 2 2005 9 541.673 0.990 2 2005 10 542.846 0.859 3 2005 11 542.410 0.916 1 2005 12 543.470 1.374 1 2006 1 544.170 1.614 1 2006 2 543.710 1.630 1 2006 3 543.162 1.274 2 2006 4 543.303 1.058 3 2006 5 542.575 0.664 2 2006 6 541.420 1.116 2 2006 7 540.797 0.950 2 2006 8 539.501 0.634 2 2006 9 539.964 1.209 2 2006 10 540.344 1.084 2 2006 11 540.512 1.114 2 2006 12 540.697 0.817 2 2007 1 540.850 1.134 1 2007 2 540.958 0.805 2 2007 3 540.361 0.747 2 2007 4 540.320 1.278 1 2007 5 540.448 1.860 2 2007 6 539.148 0.797 2 2007 7 538.140 0.879 2 2007 8 538.770 1.125 1 2007 9 537.611 0.998 2 2007 10 538.935 0.943 2 2007 11 538.051 0.882 2 2007 12 537.966 1.774 2 2008 1 537.963 1.177 2 2008 2 537.242 2.408 2 2008 3 537.229 1.041 3 2008 4 537.600 0.928 1 2008 5 nan nan 0 2008 6 535.708 1.002 3 2008 7 535.333 0.917 3 2008 8 535.410 0.748 1 2008 9 536.588 0.589 2 2008 10 535.476 1.068 2 2008 11 535.747 2.344 2 2008 12 nan nan 0 2009 1 535.910 1.829 2 2009 2 536.306 1.138 2 2009 3 535.608 1.204 2 2009 4 534.903 0.938 2 2009 5 534.503 0.837 2 2009 6 nan nan 0 2009 7 531.954 0.911 2 2009 8 533.146 1.134 2 2009 9 532.428 0.591 2 2009 10 nan nan 0 2009 11 532.861 0.935 2 2009 12 532.200 1.222 1 2010 1 532.979 1.386 2 2010 2 532.250 1.193 1 2010 3 531.064 1.415 2 2010 4 531.323 1.663 2 2010 5 530.745 0.744 2 2010 6 531.547 0.980 2 2010 7 530.108 1.098 2 2010 8 529.439 0.975 2 2010 9 529.123 0.966 2 2010 10 529.467 0.946 2 2010 11 529.416 1.326 2 2010 12 530.190 2.460 1 2011 1 529.755 0.918 2 2011 2 528.380 2.412 2 2011 3 528.607 0.820 2 2011 4 530.690 1.421 1 2011 5 528.448 1.329 2 2011 6 528.652 0.953 2 2011 7 527.713 1.085 2 2011 8 526.713 0.966 2 2011 9 527.370 1.082 2 2011 10 528.178 0.981 2 2011 11 527.329 0.733 2 2011 12 527.280 1.573 1 2012 1 526.980 1.130 1 2012 2 526.801 1.607 3 2012 3 nan nan 0 2012 4 525.997 1.042 2 2012 5 525.543 1.148 3 2012 6 524.110 0.807 1 2012 7 523.892 1.491 2 2012 8 524.223 1.492 2 2012 9 523.461 0.919 2 2012 10 523.528 1.096 2 2012 11 523.820 1.035 2 2012 12 523.921 1.060 2 2013 1 524.411 0.641 2 2013 2 524.410 0.803 1 2013 3 522.830 0.823 1 2013 4 523.038 0.853 2 2013 5 522.452 1.704 2 2013 6 nan nan 0 2013 7 521.679 0.996 2 2013 8 521.485 0.753 2 2013 9 nan nan 0 2013 10 521.470 0.679 2 2013 11 520.964 1.020 2 2013 12 520.861 1.085 2 2014 1 521.920 0.957 1 2014 2 522.070 1.017 1 2014 3 521.610 1.458 1 2014 4 521.479 0.977 2 2014 5 521.598 0.682 2 2014 6 nan nan 0 2014 7 520.186 0.762 2 2014 8 520.827 0.751 2 2014 9 519.590 0.813 1 2014 10 519.652 1.004 2 2014 11 519.647 0.694 2 2014 12 519.760 1.167 2 2015 1 519.702 0.870 2 2015 2 520.674 1.470 2 2015 3 nan nan 0 2015 4 518.770 1.649 1 2015 5 519.070 2.646 1 2015 6 nan nan 0 2015 7 nan nan 0 2015 8 nan nan 0 2015 9 517.690 2.047 1 2015 10 516.486 1.990 2 2015 11 nan nan 0 2015 12 nan nan 0 2016 1 516.380 8.877 1 2016 2 513.950 4.786 1 2016 3 nan nan 0 2016 4 513.830 3.583 1 2016 5 nan nan 0 2016 6 nan nan 0 2016 7 nan nan 0 2016 8 513.950 0.471 1 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 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