# file: mhd_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: MHD -- Mace Head, Ireland -- 53.33 N, 9.90 W, 25 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 "mhd_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 # MCottoMHDyr MCottoMHDmon MCottoMHDm MCottoMHDsd MCottoMHDn 1998 1 nan nan 0 1998 2 nan nan 0 1998 3 nan nan 0 1998 4 nan nan 0 1998 5 nan nan 0 1998 6 nan nan 0 1998 7 nan nan 0 1998 8 nan nan 0 1998 9 nan nan 0 1998 10 63.260 0.352 1 1998 11 61.564 0.304 2 1998 12 61.410 0.433 1 1999 1 61.630 0.339 1 1999 2 59.130 0.545 1 1999 3 nan nan 0 1999 4 58.490 0.442 1 1999 5 nan nan 0 1999 6 56.660 0.388 1 1999 7 55.359 0.273 2 1999 8 53.693 0.285 2 1999 9 nan nan 0 1999 10 nan nan 0 1999 11 nan nan 0 1999 12 nan nan 0 2000 1 nan nan 0 2000 2 nan nan 0 2000 3 nan nan 0 2000 4 nan nan 0 2000 5 nan nan 0 2000 6 nan nan 0 2000 7 nan nan 0 2000 8 nan nan 0 2000 9 nan nan 0 2000 10 nan nan 0 2000 11 nan nan 0 2000 12 nan nan 0 2001 1 nan nan 0 2001 2 nan nan 0 2001 3 nan nan 0 2001 4 nan nan 0 2001 5 nan nan 0 2001 6 nan nan 0 2001 7 37.920 0.297 1 2001 8 37.772 0.361 2 2001 9 37.167 0.273 2 2001 10 36.440 0.225 1 2001 11 nan nan 0 2001 12 nan nan 0 2002 1 36.320 0.282 1 2002 2 35.683 0.281 3 2002 3 35.500 0.133 1 2002 4 35.162 0.222 2 2002 5 nan nan 0 2002 6 nan nan 0 2002 7 nan nan 0 2002 8 nan nan 0 2002 9 31.550 0.249 1 2002 10 31.028 0.245 2 2002 11 30.849 0.304 2 2002 12 31.090 0.226 1 2003 1 30.303 0.262 2 2003 2 30.030 0.283 2 2003 3 29.795 0.241 3 2003 4 29.010 0.248 1 2003 5 29.192 0.219 2 2003 6 28.750 0.290 2 2003 7 27.555 0.757 2 2003 8 27.280 0.204 1 2003 9 26.745 0.161 3 2003 10 26.500 0.388 1 2003 11 26.021 0.285 3 2003 12 26.215 0.242 2 2004 1 25.451 0.210 2 2004 2 25.557 0.172 2 2004 3 25.075 0.243 2 2004 4 25.103 0.226 2 2004 5 24.810 0.166 2 2004 6 23.817 0.276 2 2004 7 23.415 0.226 2 2004 8 22.831 0.223 2 2004 9 22.623 0.140 2 2004 10 21.950 0.124 1 2004 11 21.300 0.255 2 2004 12 21.213 0.151 2 2005 1 21.117 0.149 2 2005 2 20.759 0.184 2 2005 3 20.500 0.150 1 2005 4 21.010 0.185 2 2005 5 20.072 0.227 3 2005 6 19.550 0.269 1 2005 7 19.831 0.290 2 2005 8 18.931 0.203 2 2005 9 18.658 0.214 2 2005 10 18.422 0.243 3 2005 11 18.404 0.169 2 2005 12 18.220 0.306 2 2006 1 17.900 0.252 1 2006 2 17.791 0.296 2 2006 3 17.369 0.221 2 2006 4 17.277 0.241 3 2006 5 17.116 0.231 2 2006 6 16.352 0.332 2 2006 7 16.149 0.318 2 2006 8 15.707 0.215 2 2006 9 15.156 0.148 2 2006 10 15.347 0.156 2 2006 11 15.085 0.325 2 2006 12 15.194 0.446 2 2007 1 15.120 0.294 1 2007 2 14.845 0.268 2 2007 3 14.864 0.237 2 2007 4 14.015 0.467 2 2007 5 14.480 0.194 2 2007 6 13.767 0.290 2 2007 7 13.569 0.194 2 2007 8 13.190 0.241 1 2007 9 12.997 0.229 2 2007 10 12.749 0.212 2 2007 11 12.677 0.180 2 2007 12 12.728 0.270 2 2008 1 12.877 0.273 2 2008 2 12.618 0.247 2 2008 3 12.461 0.241 3 2008 4 12.240 0.152 1 2008 5 nan nan 0 2008 6 11.732 0.343 3 2008 7 11.461 0.129 3 2008 8 11.170 0.138 1 2008 9 11.007 0.274 2 2008 10 10.789 0.250 2 2008 11 10.781 0.163 2 2008 12 10.757 0.182 2 2009 1 10.726 0.443 2 2009 2 10.698 0.204 2 2009 3 10.557 0.283 2 2009 4 10.268 0.255 2 2009 5 10.230 0.117 2 2009 6 nan nan 0 2009 7 9.698 0.160 2 2009 8 9.396 0.172 2 2009 9 9.255 0.154 2 2009 10 nan nan 0 2009 11 8.925 0.212 2 2009 12 9.050 0.259 1 2010 1 8.951 0.181 2 2010 2 8.815 0.191 2 2010 3 8.675 0.232 2 2010 4 8.741 0.208 2 2010 5 8.539 0.205 2 2010 6 8.140 0.202 2 2010 7 8.182 0.213 2 2010 8 7.933 0.166 2 2010 9 7.779 0.196 2 2010 10 7.683 0.193 2 2010 11 7.639 0.288 2 2010 12 7.375 0.248 2 2011 1 7.433 0.156 2 2011 2 7.425 0.109 2 2011 3 7.100 0.242 1 2011 4 7.435 0.220 2 2011 5 7.259 0.209 2 2011 6 6.925 0.304 2 2011 7 6.902 0.144 2 2011 8 6.670 0.141 2 2011 9 6.523 0.125 2 2011 10 6.336 0.544 2 2011 11 6.525 0.256 2 2011 12 6.630 0.211 1 2012 1 6.230 0.215 1 2012 2 6.110 0.238 3 2012 3 nan nan 0 2012 4 6.235 0.302 2 2012 5 5.902 0.122 3 2012 6 5.940 0.240 1 2012 7 5.804 0.160 2 2012 8 5.646 0.346 2 2012 9 5.470 0.114 1 2012 10 5.331 0.187 2 2012 11 5.407 0.240 2 2012 12 5.354 0.141 2 2013 1 5.147 0.176 2 2013 2 5.210 0.163 1 2013 3 5.220 0.145 1 2013 4 4.964 0.219 2 2013 5 4.973 0.175 2 2013 6 nan nan 0 2013 7 4.589 0.141 2 2013 8 4.640 0.227 1 2013 9 nan nan 0 2013 10 4.530 0.744 1 2013 11 4.393 0.182 2 2013 12 4.324 0.134 2 2014 1 4.410 0.136 1 2014 2 4.250 0.159 1 2014 3 nan nan 0 2014 4 4.019 0.148 2 2014 5 4.264 0.162 2 2014 6 nan nan 0 2014 7 3.975 0.214 2 2014 8 4.114 0.190 2 2014 9 3.910 0.230 1 2014 10 3.867 0.184 2 2014 11 3.725 0.218 2 2014 12 3.700 0.154 2 2015 1 3.654 0.227 2 2015 2 3.700 0.186 2 2015 3 nan nan 0 2015 4 3.680 0.211 1 2015 5 3.667 0.173 2 2015 6 3.578 0.241 2 2015 7 3.396 0.134 2 2015 8 3.259 0.130 2 2015 9 3.300 0.258 1 2015 10 3.360 0.259 2 2015 11 3.070 0.163 2 2015 12 3.120 0.218 1 2016 1 3.511 0.737 2 2016 2 3.174 0.180 2 2016 3 3.240 0.110 1 2016 4 2.991 0.125 2 2016 5 3.046 0.148 2 2016 6 2.860 0.206 1 2016 7 2.737 0.143 2 2016 8 2.737 0.132 2 2016 9 2.774 0.179 2 2016 10 2.710 0.235 1 2016 11 2.781 0.196 2 2016 12 2.658 0.203 2 2017 1 2.738 0.157 2 2017 2 2.640 0.168 1 2017 3 2.722 0.213 2 2017 4 2.554 0.196 2 2017 5 2.510 0.129 3 2017 6 2.380 0.177 1 2017 7 2.588 0.106 2 2017 8 2.379 0.154 2 2017 9 2.423 0.104 2 2017 10 2.333 0.184 2 2017 11 2.330 0.156 2 2017 12 2.362 0.149 2 2018 1 2.195 0.180 2 2018 2 2.308 0.250 2 2018 3 2.247 0.172 2 2018 4 2.216 0.175 3 2018 5 2.450 0.225 1 2018 6 nan nan 0 2018 7 nan nan 0 2018 8 2.180 0.138 1 2018 9 2.196 0.210 2 2018 10 nan nan 0 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