# file: thd_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: THD -- Trinidad Head, California -- 41.05 N, 124.15 W, 107 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 "thd_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 # F11ottoTHDyr F11ottoTHDmon F11ottoTHDm F11ottoTHDsd F11ottoTHDn 2002 1 nan nan 0 2002 2 258.810 0.490 1 2002 3 258.220 0.216 4 2002 4 257.652 0.267 6 2002 5 257.085 0.496 8 2002 6 257.162 0.423 4 2002 7 256.303 0.310 5 2002 8 256.211 0.347 4 2002 9 256.660 0.454 4 2002 10 256.350 1.589 1 2002 11 256.340 0.437 1 2002 12 256.567 0.481 2 2003 1 255.649 0.245 3 2003 2 255.668 0.294 4 2003 3 255.226 0.340 3 2003 4 255.249 0.470 4 2003 5 254.743 0.315 5 2003 6 254.510 0.249 5 2003 7 254.092 0.349 5 2003 8 253.488 0.548 4 2003 9 253.709 0.363 4 2003 10 253.784 0.281 5 2003 11 253.881 0.288 3 2003 12 253.656 0.253 4 2004 1 253.663 0.412 4 2004 2 253.295 0.292 4 2004 3 253.026 0.280 5 2004 4 252.855 0.379 4 2004 5 252.631 0.441 4 2004 6 252.571 0.436 5 2004 7 251.768 0.364 4 2004 8 251.881 0.422 3 2004 9 251.603 0.573 5 2004 10 251.679 0.389 4 2004 11 251.045 0.551 2 2004 12 251.421 0.372 5 2005 1 251.224 0.418 3 2005 2 251.268 0.332 3 2005 3 251.189 0.326 4 2005 4 250.947 0.301 3 2005 5 250.733 0.431 4 2005 6 250.756 0.475 4 2005 7 249.995 0.366 4 2005 8 249.648 0.360 4 2005 9 249.709 0.310 4 2005 10 249.401 0.279 4 2005 11 249.927 0.345 3 2005 12 249.618 0.399 4 2006 1 249.360 0.374 3 2006 2 249.372 0.474 4 2006 3 249.228 0.730 3 2006 4 249.046 0.403 4 2006 5 248.767 0.300 5 2006 6 248.393 0.320 4 2006 7 247.738 0.442 4 2006 8 247.493 0.329 4 2006 9 247.331 0.436 4 2006 10 247.446 0.308 4 2006 11 247.303 0.275 5 2006 12 247.361 0.322 3 2007 1 247.481 0.489 3 2007 2 247.058 0.497 4 2007 3 246.837 0.561 3 2007 4 246.696 0.424 4 2007 5 246.316 0.394 2 2007 6 246.535 0.804 4 2007 7 245.781 0.386 3 2007 8 245.008 0.314 3 2007 9 245.520 0.501 3 2007 10 245.203 0.293 4 2007 11 245.166 0.367 3 2007 12 245.081 0.422 2 2008 1 245.413 0.235 3 2008 2 244.954 0.476 5 2008 3 244.708 0.413 3 2008 4 244.494 0.478 4 2008 5 244.275 0.511 4 2008 6 244.016 0.312 5 2008 7 243.215 0.472 3 2008 8 243.219 0.331 4 2008 9 242.995 0.459 3 2008 10 243.201 0.396 3 2008 11 243.508 0.299 5 2008 12 243.785 0.525 4 2009 1 243.044 0.406 4 2009 2 242.444 0.313 4 2009 3 242.676 0.277 3 2009 4 242.373 0.371 4 2009 5 241.849 0.327 3 2009 6 241.895 0.276 4 2009 7 241.418 0.271 4 2009 8 241.279 0.327 5 2009 9 241.287 0.314 2 2009 10 241.729 0.347 3 2009 11 241.757 0.292 4 2009 12 241.532 0.325 3 2010 1 241.259 0.342 2 2010 2 241.127 0.325 4 2010 3 240.889 0.400 4 2010 4 240.729 0.385 4 2010 5 240.468 0.240 4 2010 6 239.980 0.265 4 2010 7 239.358 0.380 5 2010 8 239.348 0.298 3 2010 9 239.281 0.330 3 2010 10 239.857 0.291 5 2010 11 239.264 0.416 2 2010 12 239.583 0.323 4 2011 1 239.272 0.410 3 2011 2 239.031 0.349 4 2011 3 238.923 0.336 4 2011 4 238.530 0.311 4 2011 5 238.552 0.390 4 2011 6 238.204 0.469 3 2011 7 237.698 0.301 5 2011 8 237.184 0.334 4 2011 9 237.342 0.267 3 2011 10 237.333 0.495 2 2011 11 237.441 0.290 3 2011 12 237.642 0.298 5 2012 1 237.546 0.471 3 2012 2 237.439 0.448 4 2012 3 237.317 0.539 2 2012 4 236.621 0.403 4 2012 5 236.293 0.369 4 2012 6 236.016 0.279 5 2012 7 235.236 0.315 3 2012 8 235.098 0.430 2 2012 9 235.452 0.516 5 2012 10 235.552 0.247 4 2012 11 235.738 0.331 4 2012 12 236.064 0.338 3 2013 1 235.960 0.282 1 2013 2 235.606 0.387 3 2013 3 234.980 0.334 5 2013 4 234.676 0.346 4 2013 5 234.620 0.442 4 2013 6 234.712 0.426 4 2013 7 234.194 0.391 3 2013 8 234.111 0.371 2 2013 9 nan nan 0 2013 10 nan nan 0 2013 11 234.804 0.315 2 2013 12 234.553 0.430 5 2014 1 234.154 0.385 2 2014 2 233.687 0.460 5 2014 3 233.577 0.627 3 2014 4 233.942 0.810 3 2014 5 234.190 0.303 2 2014 6 234.364 0.354 3 2014 7 233.696 0.389 4 2014 8 233.706 0.492 5 2014 9 233.760 0.699 4 2014 10 234.227 0.319 5 2014 11 233.981 0.437 3 2014 12 233.990 0.353 4 2015 1 233.123 0.395 3 2015 2 232.846 0.440 5 2015 3 232.153 0.448 2 2015 4 232.895 0.377 3 2015 5 233.063 0.305 4 2015 6 232.832 0.361 4 2015 7 232.345 0.424 4 2015 8 231.849 0.355 5 2015 9 232.717 0.440 3 2015 10 232.822 0.406 4 2015 11 232.373 0.342 5 2015 12 232.251 0.420 3 2016 1 232.202 0.617 4 2016 2 232.060 0.997 3 2016 3 232.142 0.851 3 2016 4 231.889 1.234 4 2016 5 232.019 2.154 2 2016 6 232.231 1.507 2 2016 7 231.268 0.663 3 2016 8 230.891 0.821 4 2016 9 230.839 0.456 3 2016 10 231.053 0.804 3 2016 11 231.096 0.407 4 2016 12 231.338 0.403 3 2017 1 231.480 0.689 5 2017 2 231.110 0.403 4 2017 3 230.641 0.757 5 2017 4 230.771 0.643 4 2017 5 230.309 0.728 4 2017 6 230.342 0.689 5 2017 7 230.525 0.715 3 2017 8 229.950 0.486 4 2017 9 230.343 0.554 5 2017 10 230.536 0.888 3 2017 11 231.086 0.729 3 2017 12 230.002 0.723 4 2018 1 230.510 0.514 4 2018 2 230.039 0.682 4 2018 3 229.136 0.332 5 2018 4 229.921 0.992 3 2018 5 229.573 0.762 5 2018 6 229.651 0.944 3 2018 7 nan nan 0 2018 8 228.444 0.375 2 2018 9 228.837 0.665 4 2018 10 228.821 0.571 4 2018 11 229.646 0.895 3 2018 12 228.917 0.692 5 2019 1 228.103 0.618 3 2019 2 227.624 0.604 4 2019 3 228.926 1.020 5 2019 4 227.459 0.369 4 2019 5 227.884 0.571 5 2019 6 227.817 0.563 4 2019 7 227.146 0.409 3 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