# file: thd_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: 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_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 # MCottoTHDyr MCottoTHDmon MCottoTHDm MCottoTHDsd MCottoTHDn 2002 1 nan nan 0 2002 2 35.590 0.381 1 2002 3 35.169 0.199 4 2002 4 34.665 0.199 6 2002 5 34.173 0.426 8 2002 6 33.701 0.288 4 2002 7 32.415 0.739 4 2002 8 31.777 0.505 4 2002 9 31.334 0.264 4 2002 10 31.330 0.259 5 2002 11 30.799 0.260 3 2002 12 30.910 0.230 3 2003 1 30.211 0.228 4 2003 2 29.907 0.136 4 2003 3 29.543 0.315 3 2003 4 29.433 0.276 4 2003 5 28.825 0.248 6 2003 6 28.369 0.303 6 2003 7 27.753 0.358 5 2003 8 26.777 0.171 4 2003 9 26.540 0.172 4 2003 10 26.044 0.297 5 2003 11 26.191 0.232 3 2003 12 25.943 0.237 4 2004 1 25.685 0.200 4 2004 2 25.550 0.240 4 2004 3 25.268 0.154 5 2004 4 25.086 0.169 4 2004 5 24.267 0.559 4 2004 6 24.109 0.362 4 2004 7 23.238 0.263 4 2004 8 22.570 0.313 3 2004 9 22.095 0.180 5 2004 10 21.716 0.157 4 2004 11 21.180 0.136 4 2004 12 21.305 0.152 5 2005 1 21.078 0.217 2 2005 2 20.912 0.160 4 2005 3 20.839 0.184 4 2005 4 20.627 0.375 4 2005 5 20.346 0.174 5 2005 6 20.041 0.211 4 2005 7 19.329 0.189 4 2005 8 19.001 0.255 5 2005 9 18.750 0.220 4 2005 10 18.407 0.220 4 2005 11 18.218 0.200 3 2005 12 18.151 0.266 4 2006 1 17.788 0.208 3 2006 2 17.909 0.235 4 2006 3 17.716 0.265 3 2006 4 17.492 0.217 4 2006 5 16.958 0.348 4 2006 6 16.580 0.239 4 2006 7 16.082 0.192 4 2006 8 15.766 0.196 5 2006 9 15.582 0.111 4 2006 10 15.419 0.177 4 2006 11 15.195 0.175 5 2006 12 15.061 0.204 3 2007 1 15.007 0.282 3 2007 2 14.880 0.248 4 2007 3 14.709 0.203 4 2007 4 14.709 0.242 4 2007 5 14.461 0.211 3 2007 6 14.076 0.263 4 2007 7 13.571 0.162 4 2007 8 13.098 0.171 3 2007 9 13.155 0.194 3 2007 10 12.804 0.144 4 2007 11 12.759 0.160 3 2007 12 12.655 0.250 3 2008 1 12.702 0.268 3 2008 2 12.472 0.195 5 2008 3 12.451 0.219 3 2008 4 12.291 0.204 4 2008 5 12.047 0.227 4 2008 6 11.900 0.312 5 2008 7 11.477 0.183 4 2008 8 11.092 0.200 4 2008 9 11.004 0.281 3 2008 10 11.024 0.181 4 2008 11 10.801 0.249 5 2008 12 10.773 0.292 3 2009 1 10.479 0.284 4 2009 2 10.458 0.234 5 2009 3 10.483 0.204 3 2009 4 10.339 0.149 4 2009 5 10.042 0.226 3 2009 6 9.858 0.142 4 2009 7 9.802 0.175 4 2009 8 9.378 0.144 5 2009 9 9.185 0.171 3 2009 10 9.053 0.143 3 2009 11 9.140 0.212 4 2009 12 8.907 0.196 4 2010 1 8.876 0.158 3 2010 2 8.846 0.180 3 2010 3 8.875 0.119 4 2010 4 8.762 0.200 4 2010 5 8.658 0.190 4 2010 6 8.428 0.154 4 2010 7 8.150 0.236 5 2010 8 7.927 0.152 3 2010 9 7.690 0.132 3 2010 10 7.688 0.185 5 2010 11 7.684 0.244 2 2010 12 7.536 0.201 4 2011 1 7.464 0.172 3 2011 2 7.487 0.149 4 2011 3 7.525 0.203 3 2011 4 7.426 0.182 4 2011 5 7.371 0.122 4 2011 6 7.237 0.210 3 2011 7 6.907 0.125 4 2011 8 6.770 0.121 4 2011 9 6.650 0.204 5 2011 10 6.573 0.139 4 2011 11 6.637 0.188 4 2011 12 6.495 0.132 5 2012 1 6.567 0.207 3 2012 2 6.373 0.215 4 2012 3 6.065 0.198 2 2012 4 6.230 0.182 4 2012 5 6.085 0.135 4 2012 6 5.917 0.146 5 2012 7 5.745 0.151 3 2012 8 5.700 0.200 3 2012 9 5.521 0.154 5 2012 10 5.380 0.215 4 2012 11 5.253 0.236 4 2012 12 5.422 0.170 3 2013 1 5.190 0.143 1 2013 2 5.299 0.119 3 2013 3 5.136 0.208 5 2013 4 5.135 0.178 4 2013 5 4.907 0.160 4 2013 6 4.959 0.152 4 2013 7 4.818 0.212 3 2013 8 4.664 0.212 4 2013 9 4.655 0.237 4 2013 10 4.350 0.157 1 2013 11 4.620 0.236 1 2013 12 4.422 0.240 5 2014 1 4.271 0.198 2 2014 2 4.306 0.178 4 2014 3 4.225 0.187 4 2014 4 4.136 0.190 4 2014 5 4.040 0.226 2 2014 6 4.172 0.177 3 2014 7 4.194 0.193 4 2014 8 4.016 0.167 5 2014 9 3.913 0.203 4 2014 10 3.775 0.163 5 2014 11 3.765 0.166 4 2014 12 3.672 0.173 3 2015 1 3.626 0.188 3 2015 2 3.661 0.201 5 2015 3 3.563 0.242 3 2015 4 3.602 0.145 3 2015 5 3.647 0.179 5 2015 6 3.729 0.150 4 2015 7 3.475 0.164 4 2015 8 3.318 0.133 5 2015 9 3.230 0.178 4 2015 10 3.272 0.229 4 2015 11 3.077 0.167 5 2015 12 3.127 0.109 4 2016 1 3.130 0.134 4 2016 2 3.027 0.206 3 2016 3 3.025 0.175 3 2016 4 2.964 0.148 5 2016 5 2.976 0.166 3 2016 6 3.005 0.134 4 2016 7 2.911 0.150 5 2016 8 2.811 0.155 4 2016 9 2.749 0.156 3 2016 10 2.719 0.153 5 2016 11 2.769 0.169 4 2016 12 2.732 0.225 4 2017 1 2.739 0.136 5 2017 2 2.692 0.198 4 2017 3 2.691 0.101 5 2017 4 2.634 0.155 4 2017 5 2.653 0.163 4 2017 6 2.546 0.153 5 2017 7 2.443 0.180 3 2017 8 2.358 0.100 4 2017 9 2.429 0.100 5 2017 10 2.299 0.142 4 2017 11 2.344 0.154 3 2017 12 2.276 0.120 4 2018 1 2.368 0.147 4 2018 2 2.248 0.216 4 2018 3 2.256 0.172 5 2018 4 2.291 0.061 3 2018 5 2.304 0.184 5 2018 6 2.244 0.137 3 2018 7 nan nan 0 2018 8 2.010 0.144 2 2018 9 2.107 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