# file: hfm_MC_MM.dat # # Atmospheric measurements of CH3CCl3 (Methyl Chloroform, MC) # # 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_MC_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: Methyl Chloroform # data from the NOAA/ESRL halocarbons flask program. # # Calibration scale: NOAA 2003 # 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 MC in ppt # sd Standard deviation of the mean (or single-sample precision value) # n Number of samples # MCottoHFMyr MCottoHFMmon MCottoHFMm MCottoHFMsd MCottoHFMn 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 11 111.630 1.435 2 1995 12 nan nan 0 1996 1 108.100 1.521 1 1996 2 108.730 1.042 1 1996 3 nan nan 0 1996 4 114.939 3.111 2 1996 5 116.530 1.882 1 1996 6 98.427 6.067 2 1996 7 nan nan 0 1996 8 106.910 0.772 1 1996 9 90.716 1.447 3 1996 10 89.430 0.466 1 1996 11 90.156 3.521 2 1996 12 nan nan 0 1997 1 87.848 0.645 2 1997 2 86.970 0.828 1 1997 3 87.660 0.533 1 1997 4 84.870 0.569 1 1997 5 84.275 1.542 2 1997 6 81.250 0.574 1 1997 7 78.860 0.518 1 1997 8 77.925 0.549 2 1997 9 79.010 0.740 1 1997 10 79.609 3.182 2 1997 11 nan nan 0 1997 12 77.252 3.790 2 1998 1 89.590 0.924 1 1998 2 73.326 1.011 2 1998 3 nan nan 0 1998 4 nan nan 0 1998 5 70.670 0.641 1 1998 6 74.550 0.492 1 1998 7 73.232 3.874 3 1998 8 67.491 0.898 2 1998 9 67.061 2.485 3 1998 10 62.808 1.464 2 1998 11 61.990 0.550 1 1998 12 62.840 0.586 1 1999 1 61.507 0.381 2 1999 2 61.559 2.701 2 1999 3 60.740 0.377 1 1999 4 59.840 0.542 1 1999 5 58.706 1.782 3 1999 6 57.320 0.286 1 1999 7 55.880 0.365 1 1999 8 nan nan 0 1999 9 53.500 0.308 1 1999 10 nan nan 0 1999 11 54.511 0.481 2 1999 12 52.261 0.311 3 2000 1 51.630 0.449 1 2000 2 51.122 0.763 4 2000 3 51.187 0.587 2 2000 4 49.360 0.447 1 2000 5 48.283 0.540 3 2000 6 48.105 0.544 2 2000 7 46.390 0.382 2 2000 8 44.990 0.217 1 2000 9 45.377 1.626 2 2000 10 44.250 0.182 1 2000 11 45.829 1.846 2 2000 12 42.800 0.301 1 2001 1 43.784 1.457 2 2001 2 42.320 0.152 2 2001 3 41.900 0.224 1 2001 4 42.228 0.396 2 2001 5 40.975 0.332 2 2001 6 40.864 1.407 3 2001 7 39.060 0.219 2 2001 8 38.060 0.273 1 2001 9 37.110 0.285 1 2001 10 37.558 0.926 3 2001 11 37.495 0.148 2 2001 12 37.027 0.226 2 2002 1 36.268 0.474 2 2002 2 37.250 1.308 2 2002 3 35.919 0.247 2 2002 4 35.205 0.891 4 2002 5 34.945 0.438 2 2002 6 34.373 0.502 2 2002 7 33.007 0.505 3 2002 8 33.956 1.944 2 2002 9 31.352 0.205 2 2002 10 31.398 0.649 3 2002 11 31.850 0.237 1 2002 12 30.895 0.403 2 2003 1 30.967 0.672 2 2003 2 30.297 0.288 2 2003 3 31.002 0.438 2 2003 4 30.107 0.474 2 2003 5 29.238 0.306 4 2003 6 28.955 0.388 6 2003 7 28.670 0.174 1 2003 8 27.419 0.601 2 2003 9 26.650 0.169 1 2003 10 26.942 0.770 3 2003 11 27.329 0.842 2 2003 12 26.690 0.253 1 2004 1 26.650 0.293 1 2004 2 25.623 0.210 2 2004 3 25.539 0.174 2 2004 4 25.157 0.297 2 2004 5 25.024 0.183 2 2004 6 24.510 0.158 1 2004 7 23.740 0.199 1 2004 8 23.120 0.287 1 2004 9 23.284 1.188 2 2004 10 22.166 0.140 3 2004 11 21.528 0.229 2 2004 12 nan nan 0 2005 1 21.186 0.203 2 2005 2 21.772 1.190 3 2005 3 21.133 0.523 2 2005 4 20.962 0.372 4 2005 5 20.565 0.143 5 2005 6 20.150 0.569 3 2005 7 19.571 0.226 2 2005 8 19.504 0.557 3 2005 9 19.504 1.158 3 2005 10 18.870 0.123 1 2005 11 18.180 0.328 1 2005 12 17.970 0.303 1 2006 1 18.487 0.259 2 2006 2 18.870 0.306 1 2006 3 17.623 0.257 2 2006 4 17.500 0.206 1 2006 5 17.425 0.359 5 2006 6 16.917 0.310 4 2006 7 16.045 0.490 4 2006 8 15.954 0.187 4 2006 9 15.820 0.408 4 2006 10 15.485 0.165 5 2006 11 15.277 0.317 4 2006 12 15.399 0.232 4 2007 1 15.255 0.239 4 2007 2 15.177 0.149 5 2007 3 14.797 0.207 3 2007 4 14.578 0.263 5 2007 5 14.524 0.377 4 2007 6 14.243 0.648 4 2007 7 13.977 0.566 4 2007 8 13.259 0.174 3 2007 9 13.365 0.397 3 2007 10 13.042 0.417 4 2007 11 12.897 0.142 3 2007 12 13.195 0.636 2 2008 1 12.699 0.215 4 2008 2 12.623 0.215 3 2008 3 12.513 0.191 3 2008 4 12.319 0.169 5 2008 5 12.140 0.196 4 2008 6 11.789 0.199 3 2008 7 11.618 0.184 4 2008 8 11.308 0.287 3 2008 9 11.117 0.222 4 2008 10 11.193 0.216 5 2008 11 10.931 0.301 3 2008 12 10.995 0.350 2 2009 1 10.920 0.240 4 2009 2 10.642 0.223 4 2009 3 10.530 0.234 5 2009 4 10.440 0.187 4 2009 5 10.221 0.172 4 2009 6 10.087 0.202 4 2009 7 9.841 0.121 5 2009 8 9.686 0.169 4 2009 9 9.361 0.160 5 2009 10 9.197 0.176 4 2009 11 9.173 0.146 3 2009 12 9.018 0.223 3 2010 1 9.130 0.169 4 2010 2 9.090 0.254 4 2010 3 8.857 0.334 4 2010 4 9.271 0.467 3 2010 5 8.625 0.203 4 2010 6 8.499 0.161 4 2010 7 8.118 0.249 4 2010 8 8.493 0.373 3 2010 9 8.351 0.344 3 2010 10 7.792 0.211 4 2010 11 7.873 0.325 5 2010 12 7.609 0.169 3 2011 1 7.545 0.154 3 2011 2 7.514 0.159 4 2011 3 7.481 0.254 3 2011 4 7.412 0.191 4 2011 5 7.225 0.226 3 2011 6 7.201 0.195 4 2011 7 6.892 0.223 3 2011 8 6.756 0.127 4 2011 9 6.875 0.363 5 2011 10 6.906 0.586 4 2011 11 6.728 0.221 5 2011 12 6.635 0.431 2 2012 1 6.349 0.225 4 2012 2 6.280 0.250 3 2012 3 6.341 0.390 3 2012 4 6.192 0.161 5 2012 5 6.102 0.234 4 2012 6 6.178 0.192 2 2012 7 5.875 0.170 4 2012 8 5.530 0.183 3 2012 9 5.441 0.151 3 2012 10 5.529 0.275 3 2012 11 5.509 0.805 3 2012 12 5.319 0.282 2 2013 1 5.700 0.467 2 2013 2 5.380 0.365 4 2013 3 5.394 0.320 2 2013 4 5.041 0.197 4 2013 5 4.967 1.740 2 2013 6 4.820 0.146 1 2013 7 4.886 0.302 4 2013 8 4.927 0.372 4 2013 9 4.540 0.469 1 2013 10 5.670 1.654 1 2013 11 4.550 0.198 2 2013 12 4.639 0.207 3 2014 1 4.498 0.169 3 2014 2 4.379 0.276 2 2014 3 4.089 0.223 4 2014 4 4.160 0.193 4 2014 5 4.271 0.130 2 2014 6 4.288 0.140 2 2014 7 4.505 0.291 4 2014 8 4.162 0.179 4 2014 9 3.958 0.150 4 2014 10 3.995 0.166 4 2014 11 3.927 0.211 3 2014 12 3.933 0.280 3 2015 1 3.742 0.163 4 2015 2 3.714 0.188 3 2015 3 3.620 0.188 1 2015 4 3.635 0.149 3 2015 5 3.713 0.224 2 2015 6 3.698 0.207 4 2015 7 3.650 0.146 3 2015 8 3.418 0.165 4 2015 9 3.431 0.176 4 2015 10 3.402 0.225 2 2015 11 3.153 0.239 4 2015 12 3.279 0.196 3 2016 1 3.155 0.192 3 2016 2 3.279 0.318 2 2016 3 3.141 0.144 3 2016 4 3.103 0.196 3 2016 5 3.027 0.107 3 2016 6 2.978 0.162 2 2016 7 3.049 0.141 2 2016 8 2.861 0.138 4 2016 9 3.021 0.183 3 2016 10 2.817 0.128 2 2016 11 2.680 0.122 3 2016 12 2.816 0.250 2 2017 1 2.796 0.172 3 2017 2 2.729 0.184 4 2017 3 2.735 0.163 3 2017 4 2.745 0.173 3 2017 5 2.804 0.141 4 2017 6 2.699 0.226 3 2017 7 2.576 0.149 3 2017 8 2.534 0.110 3 2017 9 2.559 0.185 4 2017 10 2.520 0.095 3 2017 11 2.401 0.126 3 2017 12 2.471 0.180 3 2018 1 2.344 0.140 4 2018 2 2.288 0.214 3 2018 3 2.377 0.382 3 2018 4 2.283 0.186 2 2018 5 2.460 0.186 1 2018 6 2.445 0.161 3 2018 7 nan nan 0 2018 8 2.050 0.177 1 2018 9 2.200 0.159 2 2018 10 2.430 0.300 1 2018 11 nan nan 0 2018 12 nan nan 0 2019 1 nan nan 0 2019 2 nan nan 0 2019 3 nan nan 0 2019 4 nan nan 0 2019 5 nan nan 0 2019 6 nan nan 0 2019 7 nan nan 0 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