# file: alt_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: 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_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 # F11ottoALTyr F11ottoALTmon F11ottoALTm F11ottoALTsd F11ottoALTn 1995 1 nan nan 0 1995 2 269.190 0.485 1 1995 3 269.720 0.543 1 1995 4 269.163 0.355 2 1995 5 nan nan 0 1995 6 nan nan 0 1995 7 nan nan 0 1995 8 267.993 0.283 2 1995 9 268.030 0.623 1 1995 10 nan nan 0 1995 11 268.500 0.464 4 1995 12 nan nan 0 1996 1 268.560 0.408 1 1996 2 268.890 0.539 3 1996 3 nan nan 0 1996 4 267.980 0.547 1 1996 5 268.122 0.466 3 1996 6 nan nan 0 1996 7 267.983 0.549 2 1996 8 266.744 0.406 2 1996 9 nan nan 0 1996 10 267.160 0.676 1 1996 11 266.890 0.626 3 1996 12 nan nan 0 1997 1 nan nan 0 1997 2 266.712 0.543 4 1997 3 267.204 0.426 2 1997 4 nan nan 0 1997 5 nan nan 0 1997 6 265.857 0.331 2 1997 7 265.470 0.378 1 1997 8 nan nan 0 1997 9 nan nan 0 1997 10 nan nan 0 1997 11 nan nan 0 1997 12 nan nan 0 1998 1 265.075 0.285 2 1998 2 nan nan 0 1998 3 nan nan 0 1998 4 264.550 0.439 3 1998 5 264.180 0.421 1 1998 6 264.870 0.569 1 1998 7 263.710 0.672 2 1998 8 263.410 0.499 1 1998 9 263.367 0.414 2 1998 10 263.933 0.398 3 1998 11 264.099 0.550 4 1998 12 264.325 0.532 3 1999 1 264.073 0.461 2 1999 2 263.900 0.358 4 1999 3 263.719 0.306 3 1999 4 262.830 0.451 1 1999 5 262.909 0.549 4 1999 6 261.770 0.425 3 1999 7 261.208 0.235 3 1999 8 261.312 0.367 3 1999 9 262.050 0.811 1 1999 10 261.577 0.343 4 1999 11 261.543 0.524 3 1999 12 nan nan 0 2000 1 262.154 0.450 4 2000 2 262.254 0.485 3 2000 3 262.020 0.414 2 2000 4 261.345 0.933 2 2000 5 260.459 1.669 2 2000 6 nan nan 0 2000 7 260.876 0.352 2 2000 8 nan nan 0 2000 9 260.250 0.615 1 2000 10 nan nan 0 2000 11 261.073 0.434 4 2000 12 260.684 0.480 3 2001 1 nan nan 0 2001 2 261.062 0.557 4 2001 3 260.169 0.290 2 2001 4 nan nan 0 2001 5 260.150 0.476 1 2001 6 nan nan 0 2001 7 258.501 0.386 3 2001 8 257.675 0.506 3 2001 9 257.697 0.519 3 2001 10 257.845 0.303 4 2001 11 258.594 0.257 3 2001 12 258.632 0.340 4 2002 1 258.735 0.368 4 2002 2 258.100 0.363 2 2002 3 258.217 0.516 4 2002 4 nan nan 0 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 10 256.560 0.575 3 2002 11 256.396 0.430 4 2002 12 256.724 0.626 4 2003 1 256.310 0.875 3 2003 2 nan nan 0 2003 3 nan nan 0 2003 4 255.660 0.755 1 2003 5 255.294 0.286 3 2003 6 254.957 0.408 4 2003 7 254.135 0.235 4 2003 8 253.010 0.749 1 2003 9 253.089 0.489 3 2003 10 253.542 0.268 5 2003 11 253.741 0.270 4 2003 12 253.996 0.283 3 2004 1 253.800 0.297 5 2004 2 253.507 0.431 4 2004 3 253.353 0.372 4 2004 4 253.378 0.396 3 2004 5 253.106 0.491 3 2004 6 252.791 0.332 5 2004 7 251.972 0.411 2 2004 8 nan nan 0 2004 9 250.950 0.468 1 2004 10 251.489 0.444 3 2004 11 251.550 0.629 3 2004 12 251.690 0.278 1 2005 1 251.600 0.242 1 2005 2 251.529 0.267 5 2005 3 251.454 0.582 4 2005 4 251.364 0.435 4 2005 5 250.958 0.409 4 2005 6 250.641 0.391 5 2005 7 250.302 0.495 4 2005 8 249.805 0.534 4 2005 9 249.268 0.303 4 2005 10 249.549 0.386 4 2005 11 249.449 0.310 4 2005 12 249.829 0.393 2 2006 1 249.530 0.326 1 2006 2 249.484 0.451 5 2006 3 249.186 0.430 4 2006 4 249.354 0.284 4 2006 5 249.252 0.693 4 2006 6 248.390 0.356 4 2006 7 247.964 0.304 4 2006 8 247.082 0.450 4 2006 9 246.696 0.322 4 2006 10 246.891 0.299 4 2006 11 247.167 0.272 5 2006 12 247.530 0.316 4 2007 1 247.558 0.630 4 2007 2 247.279 0.497 4 2007 3 246.756 0.423 4 2007 4 246.697 0.362 4 2007 5 246.212 0.401 4 2007 6 245.962 0.391 4 2007 7 245.532 0.440 4 2007 8 245.097 0.369 5 2007 9 244.813 0.356 4 2007 10 244.680 0.339 4 2007 11 245.158 0.332 4 2007 12 245.349 0.462 4 2008 1 245.564 0.490 5 2008 2 244.900 0.432 3 2008 3 244.960 0.386 4 2008 4 244.640 0.372 4 2008 5 244.053 0.525 4 2008 6 243.984 0.508 3 2008 7 243.229 0.209 5 2008 8 242.936 0.378 4 2008 9 242.673 0.331 3 2008 10 242.910 0.342 5 2008 11 243.456 0.454 4 2008 12 243.855 0.307 5 2009 1 243.513 0.303 3 2009 2 243.256 0.352 4 2009 3 243.040 0.307 4 2009 4 243.206 0.697 4 2009 5 242.867 0.364 4 2009 6 242.110 0.424 4 2009 7 nan nan 0 2009 8 nan nan 0 2009 9 nan nan 0 2009 10 nan nan 0 2009 11 nan nan 0 2009 12 nan nan 0 2010 1 nan nan 0 2010 2 nan nan 0 2010 3 nan nan 0 2010 4 240.690 0.375 1 2010 5 240.375 0.326 4 2010 6 239.906 0.301 3 2010 7 239.411 0.366 4 2010 8 239.304 0.459 4 2010 9 238.918 0.363 4 2010 10 238.903 0.206 4 2010 11 239.498 0.360 2 2010 12 239.618 0.295 5 2011 1 239.471 0.305 4 2011 2 239.410 0.623 4 2011 3 239.106 0.381 5 2011 4 238.634 0.355 4 2011 5 238.517 0.340 4 2011 6 238.407 0.414 4 2011 7 nan nan 0 2011 8 237.122 0.573 2 2011 9 237.011 0.327 5 2011 10 237.088 0.320 4 2011 11 237.623 0.393 3 2011 12 237.804 0.454 3 2012 1 237.958 0.419 4 2012 2 237.682 0.284 4 2012 3 236.852 0.380 5 2012 4 236.773 0.297 4 2012 5 236.467 0.327 4 2012 6 235.957 0.307 3 2012 7 235.226 0.320 4 2012 8 234.809 0.278 4 2012 9 234.797 0.298 4 2012 10 235.157 0.477 4 2012 11 235.841 0.431 5 2012 12 236.232 0.444 4 2013 1 236.159 0.410 4 2013 2 nan nan 0 2013 3 nan nan 0 2013 4 nan nan 0 2013 5 nan nan 0 2013 6 nan nan 0 2013 7 nan nan 0 2013 8 nan nan 0 2013 9 nan nan 0 2013 10 234.308 0.574 3 2013 11 234.373 0.298 3 2013 12 234.177 0.369 4 2014 1 234.101 0.563 4 2014 2 nan nan 0 2014 3 nan nan 0 2014 4 nan nan 0 2014 5 nan nan 0 2014 6 nan nan 0 2014 7 233.522 0.426 3 2014 8 233.365 0.377 4 2014 9 233.267 0.337 5 2014 10 233.333 0.310 4 2014 11 233.653 0.354 4 2014 12 233.689 0.271 2 2015 1 233.763 0.309 4 2015 2 233.320 0.374 1 2015 3 232.815 0.323 5 2015 4 232.962 0.422 4 2015 5 232.883 0.424 4 2015 6 232.802 0.318 4 2015 7 232.339 0.565 4 2015 8 231.742 0.260 4 2015 9 231.480 0.357 5 2015 10 231.926 0.482 4 2015 11 232.377 0.313 4 2015 12 232.193 0.427 3 2016 1 232.110 0.427 5 2016 2 232.219 0.494 3 2016 3 231.994 0.454 5 2016 4 232.216 1.672 3 2016 5 232.768 1.079 4 2016 6 231.704 1.048 2 2016 7 231.562 0.822 2 2016 8 230.931 0.471 4 2016 9 229.863 0.355 4 2016 10 230.247 0.383 4 2016 11 nan nan 0 2016 12 231.020 0.355 4 2017 1 231.627 0.659 3 2017 2 231.129 0.498 4 2017 3 230.933 0.863 5 2017 4 229.938 0.709 4 2017 5 229.816 0.531 5 2017 6 229.567 0.520 3 2017 7 230.087 0.596 4 2017 8 229.442 0.576 2 2017 9 229.711 0.523 4 2017 10 230.121 1.044 4 2017 11 230.326 0.509 5 2017 12 230.189 0.562 3 2018 1 230.877 0.309 3 2018 2 229.646 0.505 4 2018 3 229.924 0.626 3 2018 4 229.717 0.915 5 2018 5 229.682 0.671 3 2018 6 228.910 0.884 1 2018 7 nan nan 0 2018 8 227.788 0.441 3 2018 9 227.337 0.492 4 2018 10 228.267 0.533 5 2018 11 228.914 0.610 2 2018 12 228.623 0.482 4 2019 1 228.285 0.608 3 2019 2 228.518 0.399 4 2019 3 227.669 0.515 4 2019 4 227.617 0.766 4 2019 5 228.525 0.442 3 2019 6 227.271 0.550 2 2019 7 226.480 0.654 1 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