# file: brw_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: BRW -- Barrow, Alaska -- 71.32 N, 156.61 W, 11 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 "brw_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 # MCottoBRWyr MCottoBRWmon MCottoBRWm MCottoBRWsd MCottoBRWn 1995 1 120.150 1.375 1 1995 2 116.420 0.382 1 1995 3 116.037 0.744 2 1995 4 112.740 1.365 1 1995 5 112.060 1.109 1 1995 6 nan nan 0 1995 7 nan nan 0 1995 8 107.275 1.266 2 1995 9 105.775 0.612 3 1995 10 107.088 2.312 2 1995 11 105.554 0.917 2 1995 12 104.670 0.640 1 1996 1 nan nan 0 1996 2 103.966 0.865 3 1996 3 102.722 0.681 2 1996 4 101.854 0.723 4 1996 5 100.258 1.352 5 1996 6 97.154 1.812 4 1996 7 94.915 0.846 4 1996 8 91.958 0.424 3 1996 9 89.831 0.432 4 1996 10 88.949 0.498 4 1996 11 86.968 0.760 3 1996 12 87.675 0.472 4 1997 1 87.267 0.679 4 1997 2 86.294 0.544 4 1997 3 85.733 0.560 4 1997 4 85.036 0.522 4 1997 5 83.321 0.673 5 1997 6 81.573 1.171 4 1997 7 79.979 0.367 3 1997 8 77.694 0.593 5 1997 9 nan nan 0 1997 10 75.263 0.491 5 1997 11 74.614 0.733 3 1997 12 74.489 0.614 4 1998 1 74.089 0.633 4 1998 2 73.142 0.763 2 1998 3 72.049 0.386 3 1998 4 71.745 0.553 4 1998 5 70.621 0.531 4 1998 6 69.364 0.806 2 1998 7 67.158 0.534 5 1998 8 65.475 0.552 4 1998 9 63.477 1.662 2 1998 10 62.387 0.378 3 1998 11 61.838 0.231 4 1998 12 61.341 0.262 4 1999 1 60.695 0.275 4 1999 2 60.446 0.251 3 1999 3 59.973 0.243 3 1999 4 59.564 0.266 4 1999 5 58.217 0.573 4 1999 6 56.833 0.717 3 1999 7 55.352 0.486 4 1999 8 53.988 0.378 4 1999 9 53.063 0.272 3 1999 10 52.682 0.310 5 1999 11 51.811 0.467 2 1999 12 51.753 0.370 4 2000 1 51.181 0.368 3 2000 2 50.905 0.421 4 2000 3 50.534 0.294 4 2000 4 49.144 0.596 3 2000 5 48.703 0.333 4 2000 6 47.399 0.342 4 2000 7 46.202 0.329 4 2000 8 45.584 0.376 4 2000 9 44.314 0.275 4 2000 10 43.668 0.219 4 2000 11 43.581 0.122 4 2000 12 42.924 0.161 5 2001 1 42.736 0.177 2 2001 2 42.441 0.220 4 2001 3 42.350 0.212 4 2001 4 41.558 0.225 2 2001 5 40.923 0.248 3 2001 6 40.295 0.489 5 2001 7 38.815 0.494 4 2001 8 38.094 0.297 4 2001 9 37.281 0.199 4 2001 10 36.903 0.168 3 2001 11 36.693 0.197 5 2001 12 nan nan 0 2002 1 36.628 0.182 4 2002 2 36.232 0.141 3 2002 3 35.837 0.270 5 2002 4 35.455 0.284 2 2002 5 34.531 0.191 4 2002 6 33.830 0.246 3 2002 7 33.047 0.200 3 2002 8 32.249 0.267 3 2002 9 31.695 0.194 2 2002 10 31.337 0.243 4 2002 11 30.843 0.227 5 2002 12 31.262 0.260 2 2003 1 30.409 0.266 3 2003 2 30.436 0.305 5 2003 3 30.231 0.226 3 2003 4 29.637 0.258 3 2003 5 29.202 0.164 7 2003 6 28.759 0.372 4 2003 7 28.020 0.260 3 2003 8 27.416 0.510 5 2003 9 26.748 0.185 4 2003 10 26.498 0.226 5 2003 11 26.455 0.283 3 2003 12 26.147 0.267 2 2004 1 26.147 0.198 3 2004 2 25.711 0.200 3 2004 3 25.638 0.205 5 2004 4 25.323 0.153 5 2004 5 24.807 0.255 2 2004 6 24.146 0.271 4 2004 7 23.427 0.246 4 2004 8 22.896 0.469 4 2004 9 22.433 0.211 4 2004 10 21.792 0.187 4 2004 11 21.820 0.178 3 2004 12 nan nan 0 2005 1 21.239 0.135 4 2005 2 21.153 0.156 4 2005 3 20.851 0.160 5 2005 4 20.756 0.297 2 2005 5 20.493 0.177 4 2005 6 20.006 0.171 5 2005 7 19.539 0.250 4 2005 8 18.857 0.204 3 2005 9 18.775 0.216 5 2005 10 18.331 0.226 4 2005 11 18.256 0.214 4 2005 12 18.276 0.204 5 2006 1 18.047 0.351 3 2006 2 17.894 0.273 4 2006 3 17.757 0.254 3 2006 4 17.438 0.305 4 2006 5 17.078 0.176 4 2006 6 16.707 0.226 4 2006 7 16.172 0.189 4 2006 8 15.798 0.201 5 2006 9 15.463 0.183 4 2006 10 15.438 0.228 3 2006 11 15.233 0.197 4 2006 12 15.168 0.213 4 2007 1 15.186 0.183 2 2007 2 14.896 0.165 4 2007 3 14.728 0.162 4 2007 4 14.499 0.177 4 2007 5 14.473 0.258 2 2007 6 14.184 0.240 3 2007 7 13.769 0.204 2 2007 8 13.114 0.198 2 2007 9 13.070 0.128 4 2007 10 12.915 0.176 4 2007 11 12.959 0.149 2 2007 12 12.690 0.241 3 2008 1 12.509 0.257 2 2008 2 12.709 0.187 4 2008 3 nan nan 0 2008 4 12.526 0.220 2 2008 5 12.173 0.183 5 2008 6 12.003 0.167 4 2008 7 11.800 0.175 4 2008 8 11.373 0.165 2 2008 9 11.009 0.236 2 2008 10 10.873 0.226 4 2008 11 10.804 0.239 3 2008 12 10.739 0.191 5 2009 1 10.796 0.163 4 2009 2 10.608 0.282 4 2009 3 10.547 0.199 3 2009 4 10.242 0.247 2 2009 5 10.183 0.145 3 2009 6 10.025 0.116 4 2009 7 9.790 0.157 4 2009 8 9.508 0.194 4 2009 9 9.293 0.181 5 2009 10 9.183 0.157 3 2009 11 9.184 0.183 5 2009 12 9.087 0.170 4 2010 1 8.992 0.166 5 2010 2 8.960 0.235 3 2010 3 8.940 0.123 4 2010 4 8.879 0.148 5 2010 5 8.856 0.100 3 2010 6 8.396 0.227 3 2010 7 8.156 0.147 5 2010 8 8.119 0.148 4 2010 9 7.960 0.174 3 2010 10 7.758 0.198 4 2010 11 7.627 0.159 4 2010 12 7.560 0.170 4 2011 1 7.626 0.227 4 2011 2 7.481 0.128 3 2011 3 7.460 0.199 1 2011 4 nan nan 0 2011 5 7.348 0.242 3 2011 6 7.207 0.194 4 2011 7 6.953 0.127 5 2011 8 6.831 0.148 3 2011 9 6.571 0.158 3 2011 10 6.647 0.220 4 2011 11 6.583 0.157 5 2011 12 6.509 0.145 2 2012 1 6.560 0.446 2 2012 2 6.356 0.345 4 2012 3 6.261 0.212 3 2012 4 6.253 0.248 3 2012 5 6.131 0.137 5 2012 6 5.908 0.114 4 2012 7 5.782 0.145 4 2012 8 5.727 0.105 5 2012 9 5.509 0.129 4 2012 10 5.395 0.132 4 2012 11 5.334 0.125 5 2012 12 5.299 0.167 5 2013 1 5.197 0.214 4 2013 2 5.223 0.298 4 2013 3 4.989 0.220 3 2013 4 5.116 0.113 4 2013 5 4.995 0.184 4 2013 6 5.026 0.143 4 2013 7 4.833 0.124 5 2013 8 4.788 0.235 4 2013 9 4.745 0.237 3 2013 10 4.594 0.228 2 2013 11 4.338 0.443 2 2013 12 4.421 0.182 3 2014 1 4.297 0.163 4 2014 2 4.311 0.131 3 2014 3 4.116 0.172 4 2014 4 3.954 0.211 2 2014 5 4.134 0.147 4 2014 6 4.051 0.233 5 2014 7 4.085 0.136 4 2014 8 3.995 0.188 3 2014 9 3.979 0.149 4 2014 10 3.832 0.174 4 2014 11 3.754 0.200 4 2014 12 3.739 0.197 5 2015 1 3.715 0.195 4 2015 2 3.643 0.157 5 2015 3 3.556 0.213 4 2015 4 3.646 0.164 4 2015 5 3.612 0.210 3 2015 6 3.620 0.157 5 2015 7 3.442 0.179 4 2015 8 3.423 0.201 4 2015 9 3.302 0.151 4 2015 10 3.244 0.166 5 2015 11 3.246 0.208 5 2015 12 3.092 0.163 4 2016 1 3.054 0.210 4 2016 2 3.117 0.139 5 2016 3 3.101 0.223 3 2016 4 3.076 0.148 5 2016 5 3.035 0.145 4 2016 6 2.951 0.134 5 2016 7 2.932 0.125 4 2016 8 2.847 0.157 5 2016 9 2.855 0.153 3 2016 10 2.825 0.147 5 2016 11 2.660 0.122 3 2016 12 2.829 0.185 3 2017 1 2.696 0.140 4 2017 2 2.750 0.129 4 2017 3 2.693 0.206 4 2017 4 2.713 0.106 5 2017 5 2.583 0.108 4 2017 6 2.573 0.147 4 2017 7 2.497 0.111 4 2017 8 2.425 0.126 4 2017 9 2.438 0.095 3 2017 10 2.417 0.109 4 2017 11 2.437 0.122 5 2017 12 2.355 0.160 4 2018 1 2.408 0.114 4 2018 2 2.348 0.171 5 2018 3 2.236 0.172 4 2018 4 2.280 0.111 6 2018 5 2.326 0.161 4 2018 6 2.285 0.198 2 2018 7 nan nan 0 2018 8 nan nan 0 2018 9 2.077 0.144 2 2018 10 2.110 0.248 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