# file: hfm_F11_MM.dat # # Atmospheric measurements of CCl3F (CFC-11, Chlorofluorocarbon-11, F11) # # 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_F11_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-11 # data from the NOAA/ESRL halocarbons flask program. # # Calibration scale: NOAA 2016 # 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 F11 in ppt # sd Standard deviation of the mean (or single-sample precision value) # n Number of samples # F11ottoHFMyr F11ottoHFMmon F11ottoHFMm F11ottoHFMsd F11ottoHFMn 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 nan nan 0 1995 10 nan nan 0 1995 11 269.516 0.356 2 1995 12 nan nan 0 1996 1 nan nan 0 1996 2 269.810 0.448 1 1996 3 nan nan 0 1996 4 273.024 3.062 2 1996 5 275.830 2.012 1 1996 6 268.275 2.970 2 1996 7 nan nan 0 1996 8 282.210 0.462 1 1996 9 267.718 0.404 3 1996 10 nan nan 0 1996 11 266.945 1.669 2 1996 12 nan nan 0 1997 1 267.334 0.506 2 1997 2 266.610 0.653 1 1997 3 268.270 0.546 1 1997 4 265.720 0.493 1 1997 5 266.949 0.806 2 1997 6 266.430 0.332 1 1997 7 265.720 0.530 1 1997 8 265.157 0.622 2 1997 9 267.950 0.694 1 1997 10 268.007 2.786 2 1997 11 nan nan 0 1997 12 267.841 3.118 2 1998 1 275.490 0.699 1 1998 2 265.847 0.407 2 1998 3 nan nan 0 1998 4 nan nan 0 1998 5 265.890 0.447 1 1998 6 274.060 0.510 1 1998 7 270.695 6.738 3 1998 8 266.162 4.059 2 1998 9 267.900 2.051 2 1998 10 267.827 12.000 2 1998 11 263.230 0.765 1 1998 12 269.100 0.743 1 1999 1 264.871 0.560 2 1999 2 266.710 3.713 3 1999 3 264.200 0.605 1 1999 4 265.320 0.728 1 1999 5 266.694 5.325 3 1999 6 262.750 0.375 1 1999 7 269.510 0.351 1 1999 8 nan nan 0 1999 9 268.450 0.363 1 1999 10 nan nan 0 1999 11 283.935 20.980 2 1999 12 264.132 0.691 3 2000 1 263.960 0.724 1 2000 2 262.921 1.411 4 2000 3 266.032 1.230 2 2000 4 261.910 0.786 1 2000 5 262.969 1.577 3 2000 6 263.059 1.160 2 2000 7 261.462 5.607 2 2000 8 261.784 2.489 2 2000 9 262.464 3.246 2 2000 10 262.420 0.530 1 2000 11 263.189 1.938 2 2000 12 261.200 0.352 1 2001 1 262.520 3.224 2 2001 2 260.790 0.765 1 2001 3 260.450 0.875 1 2001 4 259.993 0.372 2 2001 5 260.384 2.341 2 2001 6 262.007 3.723 3 2001 7 258.967 1.909 2 2001 8 260.280 0.792 1 2001 9 258.740 0.455 1 2001 10 265.728 2.655 3 2001 11 263.836 0.912 2 2001 12 260.796 1.492 2 2002 1 258.599 0.337 2 2002 2 263.909 5.530 2 2002 3 258.870 0.493 2 2002 4 263.674 4.639 4 2002 5 261.483 0.488 2 2002 6 261.970 5.614 2 2002 7 258.074 1.994 2 2002 8 263.486 12.290 2 2002 9 256.369 0.544 2 2002 10 257.454 1.181 3 2002 11 261.290 0.607 1 2002 12 258.074 1.153 2 2003 1 257.009 1.506 2 2003 2 256.749 0.941 2 2003 3 260.725 2.164 2 2003 4 258.713 3.529 2 2003 5 256.375 1.528 4 2003 6 259.140 4.384 6 2003 7 257.450 0.404 1 2003 8 260.655 3.656 2 2003 9 254.150 0.314 1 2003 10 255.708 3.311 3 2003 11 257.488 3.762 2 2003 12 267.520 0.398 1 2004 1 257.570 0.380 1 2004 2 253.795 0.548 2 2004 3 254.626 0.301 2 2004 4 253.757 0.679 2 2004 5 257.045 0.990 2 2004 6 255.950 0.441 1 2004 7 254.630 0.448 1 2004 8 253.400 0.691 1 2004 9 256.169 6.223 2 2004 10 252.690 0.375 3 2004 11 252.023 0.470 2 2004 12 nan nan 0 2005 1 251.647 0.300 2 2005 2 255.732 9.197 3 2005 3 251.696 0.315 2 2005 4 252.477 1.413 4 2005 5 252.053 0.620 5 2005 6 259.120 4.372 3 2005 7 251.131 0.643 2 2005 8 253.316 5.966 3 2005 9 258.941 13.928 3 2005 10 253.560 0.446 1 2005 11 250.510 0.763 1 2005 12 249.700 0.519 1 2006 1 252.452 3.224 2 2006 2 260.360 0.517 1 2006 3 251.012 2.291 2 2006 4 249.930 0.437 1 2006 5 252.644 3.031 5 2006 6 249.594 2.789 4 2006 7 249.220 1.877 4 2006 8 248.958 1.366 4 2006 9 252.391 3.951 4 2006 10 249.729 1.313 5 2006 11 248.636 1.078 4 2006 12 248.638 0.920 4 2007 1 248.808 2.917 4 2007 2 248.226 1.055 5 2007 3 247.281 0.301 3 2007 4 247.445 1.555 5 2007 5 249.062 4.920 4 2007 6 247.589 0.521 4 2007 7 250.196 4.159 4 2007 8 248.522 1.458 3 2007 9 249.358 4.695 3 2007 10 251.321 7.383 4 2007 11 246.761 1.735 3 2007 12 246.924 1.414 2 2008 1 246.688 1.649 4 2008 2 245.253 0.540 3 2008 3 245.855 1.135 3 2008 4 245.015 0.632 5 2008 5 244.337 0.656 4 2008 6 245.526 1.476 3 2008 7 244.784 0.684 4 2008 8 244.308 3.110 3 2008 9 244.885 2.609 4 2008 10 244.800 1.196 5 2008 11 243.950 0.838 3 2008 12 244.406 1.365 2 2009 1 243.885 0.794 4 2009 2 243.181 0.302 4 2009 3 243.299 0.457 5 2009 4 243.152 0.925 4 2009 5 243.624 1.137 4 2009 6 243.100 1.049 4 2009 7 243.650 0.928 5 2009 8 244.286 2.202 4 2009 9 244.303 4.428 5 2009 10 243.552 2.978 4 2009 11 242.448 0.703 3 2009 12 241.832 0.287 3 2010 1 242.499 1.015 4 2010 2 241.506 0.291 4 2010 3 241.566 0.533 4 2010 4 243.403 3.602 3 2010 5 245.932 10.710 4 2010 6 241.806 2.095 4 2010 7 240.524 3.961 4 2010 8 242.793 2.460 3 2010 9 246.040 4.958 3 2010 10 239.860 0.554 4 2010 11 242.552 4.537 5 2010 12 239.661 0.753 3 2011 1 240.459 0.568 3 2011 2 239.653 0.556 4 2011 3 239.866 1.901 3 2011 4 239.853 1.703 4 2011 5 238.394 0.403 3 2011 6 238.966 1.349 4 2011 7 242.237 10.537 3 2011 8 238.569 2.150 4 2011 9 240.773 3.348 5 2011 10 239.916 2.315 4 2011 11 241.415 1.870 5 2011 12 239.732 0.586 2 2012 1 237.663 0.386 4 2012 2 239.131 2.745 3 2012 3 238.866 2.825 3 2012 4 236.997 0.380 5 2012 5 237.632 1.076 4 2012 6 238.374 1.782 2 2012 7 236.599 1.991 4 2012 8 235.274 0.196 3 2012 9 235.367 0.761 3 2012 10 235.876 1.766 3 2012 11 236.569 0.682 3 2012 12 236.240 0.540 2 2013 1 240.329 4.434 2 2013 2 236.141 0.387 4 2013 3 235.407 0.530 2 2013 4 235.560 0.624 4 2013 5 238.926 0.888 2 2013 6 234.590 0.411 1 2013 7 236.433 1.633 2 2013 8 234.089 2.025 3 2013 9 nan nan 0 2013 10 nan nan 0 2013 11 235.917 1.223 2 2013 12 235.006 0.509 2 2014 1 234.480 0.606 3 2014 2 233.518 0.474 2 2014 3 234.737 0.587 4 2014 4 234.520 0.593 4 2014 5 234.903 0.468 2 2014 6 234.645 1.259 2 2014 7 238.919 1.964 4 2014 8 234.687 0.917 4 2014 9 238.149 5.477 4 2014 10 235.547 0.412 4 2014 11 234.902 1.141 3 2014 12 234.504 0.432 3 2015 1 233.742 0.414 3 2015 2 233.760 2.405 3 2015 3 232.400 0.393 1 2015 4 232.839 0.388 3 2015 5 234.606 1.930 2 2015 6 233.483 0.442 4 2015 7 235.072 1.203 3 2015 8 233.548 1.340 4 2015 9 235.095 1.761 4 2015 10 232.754 0.537 2 2015 11 234.055 2.291 4 2015 12 233.644 0.799 3 2016 1 232.255 0.395 2 2016 2 233.182 0.915 2 2016 3 232.324 0.848 3 2016 4 232.779 1.188 3 2016 5 232.933 1.577 3 2016 6 232.443 1.653 2 2016 7 230.970 0.806 1 2016 8 233.040 1.291 3 2016 9 232.277 0.911 3 2016 10 232.386 0.672 2 2016 11 231.696 1.039 3 2016 12 232.059 0.738 2 2017 1 232.239 1.131 3 2017 2 231.545 1.044 4 2017 3 230.757 0.687 3 2017 4 231.444 1.827 3 2017 5 230.916 0.727 4 2017 6 231.671 1.861 3 2017 7 230.967 0.895 3 2017 8 230.583 0.536 3 2017 9 231.168 1.455 4 2017 10 231.031 2.340 3 2017 11 230.216 0.659 2 2017 12 232.050 0.805 3 2018 1 230.883 0.382 3 2018 2 230.273 0.862 3 2018 3 230.257 1.179 3 2018 4 229.900 0.707 2 2018 5 232.550 0.593 1 2018 6 230.025 0.680 3 2018 7 nan nan 0 2018 8 231.850 0.393 1 2018 9 229.683 0.686 2 2018 10 228.185 0.336 2 2018 11 230.173 1.259 3 2018 12 229.198 0.699 3 2019 1 228.732 0.735 4 2019 2 228.138 0.395 2 2019 3 229.530 0.507 1 2019 4 228.161 0.628 4 2019 5 229.011 2.256 4 2019 6 227.638 2.420 3 2019 7 231.231 4.604 3 2019 8 227.550 0.731 1 2019 9 nan nan 0 2019 10 nan nan 0 2019 11 nan nan 0 2019 12 nan nan 0