# file: nwr_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: NWR -- Niwot Ridge, Colorado -- 40.05 N, 105.58 W, 3523 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 "nwr_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 # F11ottoNWRyr F11ottoNWRmon F11ottoNWRm F11ottoNWRsd F11ottoNWRn 1995 1 267.490 0.483 1 1995 2 267.540 0.522 1 1995 3 267.480 0.418 1 1995 4 268.026 0.395 2 1995 5 267.901 0.460 2 1995 6 nan nan 0 1995 7 nan nan 0 1995 8 nan nan 0 1995 9 267.120 0.743 1 1995 10 267.030 0.414 1 1995 11 267.879 0.863 2 1995 12 nan nan 0 1996 1 267.457 0.666 2 1996 2 267.464 1.237 2 1996 3 268.054 0.595 2 1996 4 267.399 0.427 4 1996 5 267.123 0.472 4 1996 6 266.783 0.434 3 1996 7 266.375 0.436 2 1996 8 267.200 0.432 1 1996 9 266.480 0.436 3 1996 10 267.349 0.962 2 1996 11 266.402 0.538 3 1996 12 266.263 0.430 3 1997 1 266.248 0.502 2 1997 2 265.823 0.343 3 1997 3 265.785 0.343 3 1997 4 265.425 0.511 2 1997 5 264.670 0.815 1 1997 6 265.401 0.499 3 1997 7 265.750 0.276 1 1997 8 264.899 0.435 4 1997 9 264.838 0.305 5 1997 10 265.061 0.671 3 1997 11 265.072 0.683 3 1997 12 265.224 0.964 4 1998 1 265.052 0.561 2 1998 2 264.428 0.595 3 1998 3 264.020 0.353 2 1998 4 263.897 0.428 3 1998 5 263.130 0.580 1 1998 6 262.931 0.381 2 1998 7 263.074 0.544 2 1998 8 264.016 0.671 3 1998 9 263.347 0.638 3 1998 10 263.031 0.268 2 1998 11 263.456 0.487 4 1998 12 263.433 0.656 4 1999 1 262.879 0.505 3 1999 2 262.994 0.381 5 1999 3 262.204 0.432 3 1999 4 262.140 0.390 2 1999 5 261.817 0.259 4 1999 6 261.309 0.317 4 1999 7 261.250 0.535 3 1999 8 261.620 0.538 3 1999 9 261.499 0.295 2 1999 10 261.847 0.261 3 1999 11 261.737 0.304 4 1999 12 261.816 0.585 2 2000 1 261.534 0.398 4 2000 2 260.937 0.485 4 2000 3 261.257 0.336 3 2000 4 260.723 0.415 3 2000 5 260.450 0.432 5 2000 6 260.385 0.535 3 2000 7 260.408 0.589 3 2000 8 260.478 0.350 4 2000 9 260.182 0.282 4 2000 10 260.429 0.353 2 2000 11 260.693 0.438 4 2000 12 260.294 0.466 4 2001 1 260.935 0.341 4 2001 2 260.460 0.348 2 2001 3 260.227 0.648 4 2001 4 259.533 0.527 2 2001 5 259.208 0.561 3 2001 6 259.000 0.499 1 2001 7 258.783 0.389 2 2001 8 258.607 0.395 3 2001 9 258.915 0.615 2 2001 10 259.054 0.784 4 2001 11 258.200 0.653 1 2001 12 259.186 0.710 3 2002 1 259.099 0.724 3 2002 2 258.600 0.636 2 2002 3 258.990 0.336 2 2002 4 257.859 0.304 2 2002 5 nan nan 0 2002 6 258.097 0.499 3 2002 7 257.470 0.262 1 2002 8 257.600 0.475 2 2002 9 256.543 0.997 2 2002 10 257.220 0.352 1 2002 11 256.795 0.462 3 2002 12 257.160 0.461 1 2003 1 256.421 0.311 2 2003 2 256.670 0.414 1 2003 3 255.190 0.444 1 2003 4 255.160 0.372 1 2003 5 255.346 0.425 2 2003 6 255.020 0.390 1 2003 7 254.322 0.381 2 2003 8 nan nan 0 2003 9 254.479 0.587 2 2003 10 253.567 0.301 4 2003 11 253.815 0.365 4 2003 12 253.606 0.214 5 2004 1 253.244 0.304 2 2004 2 253.392 0.547 3 2004 3 252.618 0.351 4 2004 4 252.734 0.388 3 2004 5 253.072 0.488 2 2004 6 251.888 0.337 3 2004 7 251.884 0.365 3 2004 8 251.712 0.555 2 2004 9 251.804 0.407 2 2004 10 251.297 0.355 4 2004 11 251.777 0.483 2 2004 12 251.364 0.297 4 2005 1 251.052 0.340 3 2005 2 251.380 0.371 3 2005 3 251.100 0.357 3 2005 4 250.673 0.432 3 2005 5 250.546 0.603 2 2005 6 nan nan 0 2005 7 249.696 0.342 4 2005 8 249.862 0.442 4 2005 9 249.710 0.244 1 2005 10 249.350 0.436 1 2005 11 249.466 0.311 4 2005 12 249.560 0.359 4 2006 1 249.361 0.644 3 2006 2 248.913 0.428 5 2006 3 248.705 0.332 2 2006 4 248.325 0.387 4 2006 5 248.022 0.403 3 2006 6 248.561 0.685 3 2006 7 247.962 0.301 5 2006 8 247.707 0.392 2 2006 9 247.143 0.341 3 2006 10 247.150 0.318 4 2006 11 247.041 0.384 4 2006 12 247.109 0.353 3 2007 1 246.961 0.252 4 2007 2 246.856 0.487 3 2007 3 246.534 0.354 2 2007 4 246.507 0.501 2 2007 5 246.005 0.371 4 2007 6 245.657 0.410 2 2007 7 245.696 0.600 3 2007 8 245.322 0.315 2 2007 9 245.448 0.442 2 2007 10 245.088 0.269 4 2007 11 245.175 0.580 3 2007 12 245.319 0.452 2 2008 1 245.153 0.439 4 2008 2 244.677 0.604 4 2008 3 244.328 0.361 4 2008 4 244.037 0.427 4 2008 5 243.860 0.547 2 2008 6 243.615 0.383 5 2008 7 243.520 0.327 2 2008 8 243.640 0.374 1 2008 9 243.374 0.323 4 2008 10 243.091 0.314 4 2008 11 243.236 0.281 4 2008 12 243.005 0.320 5 2009 1 242.745 0.491 4 2009 2 242.431 0.348 3 2009 3 242.380 0.298 4 2009 4 241.744 0.334 2 2009 5 241.800 0.273 2 2009 6 241.391 0.415 3 2009 7 241.280 0.286 3 2009 8 241.294 0.368 4 2009 9 241.364 0.293 3 2009 10 241.433 0.430 3 2009 11 241.227 0.254 5 2009 12 241.383 0.316 4 2010 1 241.100 0.312 4 2010 2 241.080 0.315 4 2010 3 240.466 0.376 4 2010 4 240.070 0.244 3 2010 5 239.844 0.389 2 2010 6 240.074 0.594 2 2010 7 239.741 0.278 2 2010 8 239.720 0.285 3 2010 9 239.609 0.330 2 2010 10 239.374 0.241 2 2010 11 239.462 0.396 2 2010 12 239.665 0.559 2 2011 1 239.039 0.348 4 2011 2 238.818 0.589 4 2011 3 238.476 0.539 2 2011 4 238.080 0.411 3 2011 5 238.374 0.384 2 2011 6 237.783 0.376 2 2011 7 238.350 0.513 1 2011 8 238.343 0.399 2 2011 9 237.932 0.438 2 2011 10 237.859 0.354 3 2011 11 237.720 0.447 4 2011 12 237.534 0.406 3 2012 1 237.016 0.467 3 2012 2 237.151 0.485 5 2012 3 235.880 0.558 1 2012 4 236.419 0.603 3 2012 5 235.994 0.297 2 2012 6 235.405 0.527 3 2012 7 236.097 0.876 3 2012 8 234.925 0.288 2 2012 9 235.960 0.313 1 2012 10 235.895 0.728 3 2012 11 235.609 0.336 4 2012 12 235.512 0.300 2 2013 1 235.783 0.477 2 2013 2 234.919 0.477 2 2013 3 234.664 0.608 3 2013 4 234.998 0.624 2 2013 5 233.987 0.783 3 2013 6 nan nan 0 2013 7 234.441 0.425 3 2013 8 235.410 1.660 1 2013 9 nan nan 0 2013 10 nan nan 0 2013 11 234.801 0.606 3 2013 12 234.667 0.947 5 2014 1 233.850 0.435 1 2014 2 233.250 0.326 4 2014 3 233.777 0.831 3 2014 4 233.370 0.736 1 2014 5 234.555 0.980 3 2014 6 233.144 0.552 4 2014 7 233.843 1.167 2 2014 8 232.811 0.462 2 2014 9 233.076 0.608 5 2014 10 233.535 0.334 3 2014 11 232.960 0.365 1 2014 12 233.398 0.812 5 2015 1 232.390 0.480 4 2015 2 232.793 0.527 3 2015 3 231.960 0.336 2 2015 4 232.053 0.360 4 2015 5 nan nan 0 2015 6 231.940 0.485 3 2015 7 231.850 0.425 2 2015 8 231.966 0.384 3 2015 9 231.856 0.495 2 2015 10 232.205 0.479 3 2015 11 232.171 0.354 4 2015 12 232.239 0.456 4 2016 1 231.583 0.581 3 2016 2 231.396 0.441 4 2016 3 231.273 1.024 2 2016 4 230.824 1.470 2 2016 5 230.350 1.927 1 2016 6 230.701 1.188 2 2016 7 231.290 0.857 1 2016 8 230.799 0.811 2 2016 9 231.634 0.477 3 2016 10 230.702 0.633 3 2016 11 230.912 0.393 3 2016 12 230.718 0.407 4 2017 1 230.219 0.529 3 2017 2 230.293 0.502 4 2017 3 230.626 0.449 3 2017 4 230.576 0.856 2 2017 5 230.516 0.918 3 2017 6 229.530 0.763 1 2017 7 nan nan 0 2017 8 229.947 0.460 3 2017 9 230.465 0.460 3 2017 10 229.833 0.519 3 2017 11 229.549 0.506 3 2017 12 229.477 0.615 4 2018 1 229.497 0.566 5 2018 2 228.935 0.549 4 2018 3 228.872 0.460 2 2018 4 228.579 0.373 3 2018 5 228.949 0.785 2 2018 6 229.145 0.441 2 2018 7 nan nan 0 2018 8 229.660 0.750 1 2018 9 228.291 0.565 3 2018 10 228.435 0.627 2 2018 11 229.158 0.611 3 2018 12 228.190 0.421 3 2019 1 228.206 0.566 2 2019 2 227.759 0.509 3 2019 3 227.781 0.378 3 2019 4 227.694 0.571 3 2019 5 227.555 0.701 2 2019 6 228.070 0.677 2 2019 7 227.619 0.677 5 2019 8 nan nan 0 2019 9 nan nan 0 2019 10 nan nan 0 2019 11 nan nan 0 2019 12 nan nan 0