# file: psa_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: PSA -- Palmer Station, Antarctica -- 64.92 S, 64.00 W, 10 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 "psa_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 # MCottoPSAyr MCottoPSAmon MCottoPSAm MCottoPSAsd MCottoPSAn 2001 1 nan nan 0 2001 2 nan nan 0 2001 3 40.470 0.312 1 2001 4 39.650 0.191 1 2001 5 39.520 0.380 1 2001 6 38.849 0.573 2 2001 7 38.500 0.187 1 2001 8 38.380 0.456 1 2001 9 37.472 0.338 2 2001 10 nan nan 0 2001 11 nan nan 0 2001 12 36.180 0.430 1 2002 1 35.290 0.217 1 2002 2 nan nan 0 2002 3 34.250 0.485 1 2002 4 33.650 0.573 1 2002 5 33.010 0.445 1 2002 6 32.910 0.285 1 2002 7 nan nan 0 2002 8 32.190 0.293 1 2002 9 nan nan 0 2002 10 32.290 2.441 1 2002 11 30.433 0.259 2 2002 12 30.427 0.350 2 2003 1 29.700 0.286 1 2003 2 nan nan 0 2003 3 28.750 0.234 1 2003 4 28.450 0.706 1 2003 5 27.744 0.208 2 2003 6 27.904 0.883 2 2003 7 nan nan 0 2003 8 26.882 0.383 2 2003 9 26.672 0.232 2 2003 10 26.500 0.279 1 2003 11 26.256 0.250 2 2003 12 25.655 0.211 2 2004 1 25.338 0.554 3 2004 2 24.786 0.316 2 2004 3 23.750 0.201 1 2004 4 23.321 0.527 3 2004 5 22.579 0.192 2 2004 6 22.556 0.148 2 2004 7 22.313 0.168 4 2004 8 22.173 0.141 2 2004 9 22.112 0.186 2 2004 10 21.930 0.131 1 2004 11 21.548 0.212 2 2004 12 21.135 0.128 2 2005 1 20.680 0.184 2 2005 2 20.480 0.227 3 2005 3 20.038 0.339 2 2005 4 19.717 0.269 2 2005 5 19.533 0.241 2 2005 6 19.213 0.172 2 2005 7 18.980 0.186 1 2005 8 18.990 0.182 2 2005 9 18.622 0.229 2 2005 10 18.455 0.266 2 2005 11 18.332 0.311 2 2005 12 17.899 0.283 2 2006 1 17.482 0.233 2 2006 2 17.088 0.248 3 2006 3 16.626 0.188 2 2006 4 16.250 0.175 1 2006 5 16.049 0.219 2 2006 6 16.165 0.293 2 2006 7 15.737 0.157 3 2006 8 15.880 0.176 1 2006 9 15.650 0.307 1 2006 10 15.435 0.247 2 2006 11 15.207 0.436 2 2006 12 14.730 0.258 1 2007 1 14.589 0.318 2 2007 2 14.238 0.124 2 2007 3 13.915 0.219 2 2007 4 14.269 0.360 2 2007 5 13.316 0.219 3 2007 6 13.036 0.177 2 2007 7 13.130 0.263 1 2007 8 13.030 0.148 2 2007 9 12.964 0.141 2 2007 10 13.050 0.122 2 2007 11 12.713 0.195 2 2007 12 12.618 0.285 3 2008 1 12.279 0.225 2 2008 2 11.947 0.438 2 2008 3 11.738 0.206 2 2008 4 11.628 0.262 2 2008 5 11.143 0.211 2 2008 6 11.363 0.226 2 2008 7 11.276 0.223 2 2008 8 11.360 0.307 1 2008 9 11.313 0.378 2 2008 10 11.046 0.200 2 2008 11 10.610 0.334 1 2008 12 10.520 0.328 1 2009 1 10.450 0.303 1 2009 2 10.029 0.216 2 2009 3 nan nan 0 2009 4 9.727 0.192 2 2009 5 9.623 0.183 2 2009 6 9.443 0.206 2 2009 7 9.432 0.191 2 2009 8 9.426 0.181 2 2009 9 9.436 0.150 2 2009 10 9.266 0.205 2 2009 11 9.210 0.547 1 2009 12 8.900 0.250 1 2010 1 8.935 0.204 2 2010 2 8.790 0.423 1 2010 3 8.360 0.186 1 2010 4 8.264 0.198 2 2010 5 8.167 0.157 3 2010 6 8.043 0.198 2 2010 7 8.171 0.255 2 2010 8 7.960 0.224 1 2010 9 7.970 0.228 2 2010 10 7.880 0.216 1 2010 11 7.559 0.120 3 2010 12 7.449 0.143 2 2011 1 7.395 0.186 2 2011 2 7.245 0.159 2 2011 3 7.050 0.219 2 2011 4 7.000 0.311 3 2011 5 6.900 0.198 1 2011 6 6.780 0.231 2 2011 7 6.680 0.169 1 2011 8 6.522 0.225 2 2011 9 6.599 0.269 2 2011 10 6.695 0.226 2 2011 11 6.417 0.196 2 2011 12 6.446 0.197 3 2012 1 6.413 0.145 2 2012 2 6.125 0.249 2 2012 3 6.229 0.198 2 2012 4 6.007 0.190 3 2012 5 nan nan 0 2012 6 nan nan 0 2012 7 nan nan 0 2012 8 5.850 0.317 1 2012 9 nan nan 0 2012 10 5.440 0.240 1 2012 11 5.718 0.225 2 2012 12 5.414 0.202 3 2013 1 5.750 0.460 1 2013 2 nan nan 0 2013 3 nan nan 0 2013 4 nan nan 0 2013 5 4.784 0.204 2 2013 6 nan nan 0 2013 7 4.755 0.205 2 2013 8 4.805 0.238 2 2013 9 4.810 0.233 1 2013 10 4.402 0.167 2 2013 11 4.500 0.409 2 2013 12 4.385 0.409 2 2014 1 4.612 0.183 2 2014 2 4.424 0.218 2 2014 3 4.230 0.211 1 2014 4 4.476 0.181 3 2014 5 4.251 0.213 2 2014 6 4.230 0.200 1 2014 7 4.286 0.241 2 2014 8 4.304 0.194 2 2014 9 4.253 0.160 2 2014 10 4.162 0.173 2 2014 11 4.280 0.199 1 2014 12 nan nan 0 2015 1 4.070 0.208 1 2015 2 4.100 0.185 1 2015 3 3.935 0.147 2 2015 4 3.924 0.142 2 2015 5 3.920 0.202 1 2015 6 3.679 0.182 2 2015 7 3.512 0.191 2 2015 8 3.582 0.191 2 2015 9 3.507 0.189 2 2015 10 nan nan 0 2015 11 3.436 0.179 2 2015 12 nan nan 0 2016 1 3.296 0.174 3 2016 2 3.290 0.171 1 2016 3 3.232 0.216 2 2016 4 3.086 0.214 2 2016 5 3.106 0.209 2 2016 6 3.080 0.219 1 2016 7 2.990 0.190 1 2016 8 3.075 0.165 2 2016 9 3.200 0.172 1 2016 10 3.189 0.191 2 2016 11 3.061 0.110 2 2016 12 2.951 0.236 2 2017 1 2.973 0.189 2 2017 2 2.854 0.102 2 2017 3 2.770 0.169 1 2017 4 2.768 0.158 2 2017 5 2.712 0.124 2 2017 6 2.601 0.155 2 2017 7 2.498 0.165 2 2017 8 2.687 0.136 2 2017 9 2.445 0.131 2 2017 10 2.712 0.111 2 2017 11 2.760 0.249 1 2017 12 2.470 0.157 2 2018 1 2.257 0.255 2 2018 2 2.360 0.252 1 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