# file: spo_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: SPO -- South Pole, Antarctica -- 89.98 S, 24.80 W, 2810 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 "spo_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 # MCottoSPOyr MCottoSPOmon MCottoSPOm MCottoSPOsd MCottoSPOn 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 96.420 0.832 1 1995 11 96.170 0.833 1 1995 12 nan nan 0 1996 1 nan nan 0 1996 2 89.170 0.500 1 1996 3 nan nan 0 1996 4 87.820 0.586 1 1996 5 nan nan 0 1996 6 85.340 1.605 1 1996 7 nan nan 0 1996 8 85.430 0.654 1 1996 9 85.530 0.835 1 1996 10 nan nan 0 1996 11 83.837 1.202 2 1996 12 82.264 0.871 2 1997 1 82.559 0.837 2 1997 2 79.255 2.729 2 1997 3 77.550 0.464 1 1997 4 nan nan 0 1997 5 77.160 0.646 1 1997 6 nan nan 0 1997 7 nan nan 0 1997 8 nan nan 0 1997 9 nan nan 0 1997 10 73.210 0.484 1 1997 11 nan nan 0 1997 12 71.410 0.544 1 1998 1 nan nan 0 1998 2 nan nan 0 1998 3 66.615 0.302 2 1998 4 nan nan 0 1998 5 nan nan 0 1998 6 64.449 0.223 2 1998 7 63.920 0.523 1 1998 8 nan nan 0 1998 9 nan nan 0 1998 10 62.030 0.387 1 1998 11 nan nan 0 1998 12 60.600 0.304 1 1999 1 59.370 0.531 1 1999 2 58.209 0.668 3 1999 3 57.220 0.396 1 1999 4 nan nan 0 1999 5 nan nan 0 1999 6 54.810 0.241 2 1999 7 nan nan 0 1999 8 nan nan 0 1999 9 53.350 0.224 2 1999 10 52.660 0.303 1 1999 11 51.750 0.337 2 1999 12 50.864 0.488 2 2000 1 49.209 0.926 2 2000 2 48.532 0.346 2 2000 3 nan nan 0 2000 4 nan nan 0 2000 5 46.090 0.349 1 2000 6 46.070 0.264 1 2000 7 45.519 0.332 2 2000 8 nan nan 0 2000 9 44.680 0.181 1 2000 10 44.160 0.183 1 2000 11 43.747 0.213 2 2000 12 42.380 0.135 2 2001 1 41.333 0.446 2 2001 2 40.827 0.232 3 2001 3 40.640 0.332 1 2001 4 nan nan 0 2001 5 nan nan 0 2001 6 38.449 0.210 2 2001 7 39.110 0.317 1 2001 8 37.963 0.235 2 2001 9 37.280 0.216 1 2001 10 37.160 0.254 1 2001 11 36.421 0.447 3 2001 12 35.665 1.266 2 2002 1 34.873 0.209 2 2002 2 34.481 0.191 3 2002 3 34.027 1.054 2 2002 4 33.410 0.165 1 2002 5 32.852 0.225 2 2002 6 32.379 0.460 2 2002 7 32.270 0.230 2 2002 8 32.070 0.239 1 2002 9 31.697 1.061 2 2002 10 31.330 0.158 1 2002 11 30.645 0.255 2 2002 12 30.486 0.247 2 2003 1 29.468 0.246 3 2003 2 28.848 0.240 3 2003 3 28.660 0.307 1 2003 4 28.027 0.643 2 2003 5 27.666 0.153 3 2003 6 27.430 0.264 1 2003 7 26.999 0.757 2 2003 8 26.959 0.245 3 2003 9 26.541 0.339 2 2003 10 26.287 0.474 2 2003 11 25.765 0.254 2 2003 12 25.571 0.164 3 2004 1 24.836 0.163 3 2004 2 24.020 0.772 3 2004 3 23.527 0.270 2 2004 4 22.350 1.155 1 2004 5 22.614 0.217 2 2004 6 22.610 0.267 1 2004 7 nan nan 0 2004 8 22.330 0.187 1 2004 9 22.000 0.175 1 2004 10 21.639 0.155 3 2004 11 21.628 0.290 2 2004 12 21.096 0.214 3 2005 1 20.624 0.233 2 2005 2 20.391 0.199 2 2005 3 19.719 0.301 3 2005 4 19.721 0.375 2 2005 5 19.567 0.272 2 2005 6 19.381 0.240 2 2005 7 18.992 0.343 3 2005 8 18.416 0.677 2 2005 9 18.918 0.184 2 2005 10 18.676 0.287 3 2005 11 17.934 0.316 3 2005 12 17.711 0.238 4 2006 1 17.414 0.196 5 2006 2 16.950 0.323 3 2006 3 16.671 0.246 3 2006 4 16.100 0.304 1 2006 5 16.150 0.346 2 2006 6 15.884 0.254 2 2006 7 15.844 0.247 2 2006 8 15.704 0.218 3 2006 9 15.455 0.274 3 2006 10 15.296 0.270 3 2006 11 15.063 0.267 3 2006 12 14.951 0.281 3 2007 1 14.628 0.268 3 2007 2 14.119 0.346 2 2007 3 13.708 0.216 3 2007 4 13.330 0.235 1 2007 5 13.323 0.216 2 2007 6 13.218 0.165 4 2007 7 13.024 0.297 2 2007 8 12.963 0.241 3 2007 9 12.520 0.322 1 2007 10 12.751 0.263 2 2007 11 12.755 0.184 3 2007 12 12.451 0.202 3 2008 1 12.153 0.259 4 2008 2 12.007 0.204 3 2008 3 11.869 0.286 2 2008 4 11.662 0.202 2 2008 5 11.468 0.253 2 2008 6 11.324 0.227 4 2008 7 11.165 0.241 2 2008 8 11.215 0.190 3 2008 9 10.921 0.247 2 2008 10 10.908 0.151 4 2008 11 10.875 0.261 3 2008 12 10.527 0.268 4 2009 1 10.265 0.197 4 2009 2 10.138 0.241 4 2009 3 9.937 0.247 3 2009 4 9.639 0.189 3 2009 5 9.564 0.230 2 2009 6 9.437 0.193 3 2009 7 9.382 0.133 2 2009 8 9.264 0.187 3 2009 9 9.290 0.198 2 2009 10 9.041 0.230 3 2009 11 9.016 0.151 4 2009 12 8.836 0.146 4 2010 1 8.541 0.180 3 2010 2 8.490 0.177 4 2010 3 8.350 0.213 2 2010 4 8.242 0.156 3 2010 5 8.196 0.229 3 2010 6 7.900 0.266 1 2010 7 7.967 0.148 2 2010 8 7.896 0.156 2 2010 9 7.800 0.263 1 2010 10 7.632 0.151 3 2010 11 7.677 0.161 3 2010 12 7.416 0.204 4 2011 1 7.496 0.226 2 2011 2 7.276 0.192 4 2011 3 7.034 0.256 3 2011 4 6.975 0.244 3 2011 5 6.930 0.219 1 2011 6 6.915 0.262 2 2011 7 6.960 0.228 3 2011 8 nan nan 0 2011 9 7.013 0.353 2 2011 10 nan nan 0 2011 11 6.300 0.154 1 2011 12 6.255 0.217 2 2012 1 6.166 0.402 3 2012 2 6.040 0.203 4 2012 3 6.012 0.288 3 2012 4 5.773 0.227 3 2012 5 5.740 0.255 2 2012 6 nan nan 0 2012 7 5.540 0.234 1 2012 8 5.663 0.396 2 2012 9 5.540 0.324 1 2012 10 5.244 0.324 3 2012 11 5.518 0.158 3 2012 12 5.367 0.285 3 2013 1 5.240 0.234 1 2013 2 5.006 0.128 4 2013 3 4.930 0.652 1 2013 4 4.393 0.205 2 2013 5 4.610 0.174 1 2013 6 4.540 0.248 2 2013 7 4.410 0.589 1 2013 8 4.437 0.222 3 2013 9 4.463 0.180 2 2013 10 4.547 0.176 3 2013 11 4.355 0.165 3 2013 12 4.281 0.264 4 2014 1 4.154 0.221 3 2014 2 4.199 0.156 4 2014 3 4.086 0.159 3 2014 4 4.013 0.187 2 2014 5 4.150 0.201 1 2014 6 3.767 0.175 3 2014 7 4.030 0.201 1 2014 8 3.834 0.195 3 2014 9 3.690 0.222 2 2014 10 3.680 0.177 3 2014 11 3.640 0.177 1 2014 12 3.684 0.172 3 2015 1 3.710 0.261 1 2015 2 3.578 0.185 3 2015 3 3.543 0.230 3 2015 4 3.379 0.215 3 2015 5 3.319 0.481 2 2015 6 3.296 0.178 3 2015 7 3.210 0.321 1 2015 8 3.259 0.192 3 2015 9 3.189 0.229 2 2015 10 3.205 0.194 4 2015 11 3.042 0.108 3 2015 12 3.260 0.117 4 2016 1 3.227 0.114 2 2016 2 3.065 0.137 5 2016 3 3.040 0.191 1 2016 4 3.023 0.195 3 2016 5 2.931 0.134 2 2016 6 2.887 0.142 2 2016 7 2.820 0.189 1 2016 8 2.776 0.361 2 2016 9 2.820 0.200 1 2016 10 2.783 0.129 2 2016 11 2.795 0.245 2 2016 12 2.764 0.213 4 2017 1 nan nan 0 2017 2 2.527 0.134 5 2017 3 nan nan 0 2017 4 2.467 0.182 3 2017 5 2.306 0.209 3 2017 6 2.311 0.218 2 2017 7 2.232 0.167 3 2017 8 2.460 0.184 3 2017 9 2.308 0.202 3 2017 10 2.277 0.108 4 2017 11 2.263 0.201 3 2017 12 2.357 0.247 4 2018 1 2.232 0.234 3 2018 2 nan nan 0 2018 3 nan nan 0 2018 4 nan nan 0 2018 5 nan nan 0 2018 6 nan nan 0 2018 7 nan nan 0 2018 8 nan nan 0 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