# file: sum_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: SUM -- Summit, Greenland -- 72.58 N, 38.48 W, 3217.54 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 "sum_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 # MCottoSUMyr MCottoSUMmon MCottoSUMm MCottoSUMsd MCottoSUMn 2004 1 nan nan 0 2004 2 nan nan 0 2004 3 nan nan 0 2004 4 nan nan 0 2004 5 nan nan 0 2004 6 23.149 0.502 2 2004 7 22.415 0.156 2 2004 8 22.200 0.144 1 2004 9 21.672 0.163 2 2004 10 21.591 0.124 2 2004 11 21.257 0.138 3 2004 12 21.333 0.196 2 2005 1 20.924 0.212 2 2005 2 20.848 0.200 2 2005 3 20.702 0.178 2 2005 4 20.800 0.224 2 2005 5 20.490 0.255 2 2005 6 19.849 0.194 2 2005 7 nan nan 0 2005 8 18.932 0.250 4 2005 9 nan nan 0 2005 10 18.184 0.305 2 2005 11 18.075 0.375 2 2005 12 18.110 0.225 1 2006 1 17.926 0.298 2 2006 2 17.637 0.219 2 2006 3 17.330 0.254 1 2006 4 17.366 0.210 2 2006 5 17.017 0.170 4 2006 6 16.333 0.376 3 2006 7 nan nan 0 2006 8 15.634 0.325 2 2006 9 15.330 0.267 1 2006 10 15.250 0.198 2 2006 11 15.400 0.267 1 2006 12 15.043 0.209 2 2007 1 14.968 0.270 2 2007 2 14.790 0.288 2 2007 3 14.850 0.205 1 2007 4 nan nan 0 2007 5 14.165 0.183 2 2007 6 14.010 0.185 2 2007 7 13.519 0.194 3 2007 8 13.217 0.132 4 2007 9 13.102 0.154 5 2007 10 12.911 0.232 2 2007 11 12.661 0.176 2 2007 12 12.802 0.196 2 2008 1 12.667 0.218 2 2008 2 12.513 0.262 2 2008 3 12.267 0.198 2 2008 4 12.360 0.134 2 2008 5 12.099 0.198 2 2008 6 11.723 0.235 6 2008 7 11.492 0.175 4 2008 8 11.161 0.194 4 2008 9 11.170 0.248 3 2008 10 10.967 0.228 2 2008 11 10.765 0.220 2 2008 12 10.863 0.240 2 2009 1 10.843 0.225 2 2009 2 10.510 0.168 1 2009 3 10.556 0.160 2 2009 4 10.334 0.226 2 2009 5 10.114 0.159 2 2009 6 9.561 0.194 2 2009 7 9.663 0.242 5 2009 8 9.383 0.189 5 2009 9 9.308 0.185 4 2009 10 9.098 0.163 2 2009 11 9.114 0.156 2 2009 12 9.075 0.154 2 2010 1 9.000 0.139 2 2010 2 8.885 0.161 2 2010 3 8.835 0.174 2 2010 4 8.698 0.147 2 2010 5 8.370 0.245 1 2010 6 8.172 0.149 2 2010 7 8.040 0.234 3 2010 8 7.718 0.142 4 2010 9 7.681 0.131 4 2010 10 7.659 0.156 2 2010 11 7.540 0.109 2 2010 12 7.466 0.120 2 2011 1 7.448 0.171 2 2011 2 7.381 0.180 2 2011 3 7.456 0.110 2 2011 4 7.340 0.155 1 2011 5 7.245 0.116 2 2011 6 6.957 0.240 2 2011 7 6.763 0.174 5 2011 8 6.552 0.129 3 2011 9 6.604 0.134 4 2011 10 6.580 0.169 1 2011 11 6.450 0.291 1 2011 12 6.447 0.162 2 2012 1 6.521 0.163 2 2012 2 6.650 0.358 1 2012 3 6.385 0.358 2 2012 4 6.300 0.237 1 2012 5 5.997 0.168 2 2012 6 5.760 0.170 2 2012 7 5.652 0.120 4 2012 8 5.330 0.233 1 2012 9 5.408 0.254 2 2012 10 nan nan 0 2012 11 nan nan 0 2012 12 nan nan 0 2013 1 nan nan 0 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 4.950 0.387 3 2013 8 4.707 0.301 2 2013 9 4.498 0.164 4 2013 10 4.463 0.222 2 2013 11 4.490 0.097 2 2013 12 4.380 0.247 2 2014 1 4.220 0.213 1 2014 2 4.060 0.392 1 2014 3 4.130 0.170 1 2014 4 4.167 0.174 2 2014 5 4.250 0.175 2 2014 6 4.187 0.193 2 2014 7 4.072 0.205 5 2014 8 3.944 0.197 3 2014 9 3.891 0.145 4 2014 10 3.753 0.293 2 2014 11 3.899 0.263 2 2014 12 3.782 0.304 2 2015 1 3.947 0.178 2 2015 2 3.677 0.269 2 2015 3 3.740 0.214 1 2015 4 3.689 0.199 2 2015 5 3.517 0.303 2 2015 6 nan nan 0 2015 7 3.354 0.152 2 2015 8 3.245 0.165 5 2015 9 3.220 0.163 4 2015 10 3.081 0.252 2 2015 11 3.084 0.193 2 2015 12 3.090 0.182 1 2016 1 3.057 0.094 2 2016 2 2.935 0.128 2 2016 3 3.045 0.116 2 2016 4 2.970 0.245 2 2016 5 3.090 0.271 1 2016 6 2.870 0.320 2 2016 7 2.738 0.143 2 2016 8 2.696 0.127 5 2016 9 2.781 0.189 3 2016 10 2.765 0.227 2 2016 11 2.770 0.247 1 2016 12 2.708 0.293 2 2017 1 2.709 0.167 2 2017 2 2.740 0.082 1 2017 3 2.591 0.123 2 2017 4 2.444 0.113 2 2017 5 2.430 0.107 2 2017 6 2.426 0.105 2 2017 7 2.397 0.178 3 2017 8 2.437 0.146 5 2017 9 2.595 0.161 4 2017 10 2.411 0.153 2 2017 11 2.300 0.177 1 2017 12 2.354 0.167 2 2018 1 2.348 0.140 2 2018 2 2.520 0.186 1 2018 3 2.240 0.240 1 2018 4 2.384 0.191 2 2018 5 2.350 0.211 1 2018 6 nan nan 0 2018 7 2.117 0.168 3 2018 8 2.120 0.144 1 2018 9 nan nan 0 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