# file: alt_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: ALT -- Alert, Canada -- 82.45 N, 62.51 W, 200 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 "alt_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 # MCottoALTyr MCottoALTmon MCottoALTm MCottoALTsd MCottoALTn 1994 1 nan nan 0 1994 2 nan nan 0 1994 3 nan nan 0 1994 4 nan nan 0 1994 5 nan nan 0 1994 6 nan nan 0 1994 7 nan nan 0 1994 8 nan nan 0 1994 9 nan nan 0 1994 10 nan nan 0 1994 11 nan nan 0 1994 12 119.670 0.366 1 1995 1 nan nan 0 1995 2 116.070 0.619 1 1995 3 118.010 1.487 1 1995 4 113.931 0.919 2 1995 5 nan nan 0 1995 6 nan nan 0 1995 7 nan nan 0 1995 8 107.067 1.117 3 1995 9 105.818 0.675 4 1995 10 nan nan 0 1995 11 106.021 0.742 4 1995 12 104.220 0.846 1 1996 1 103.740 2.178 1 1996 2 103.416 0.639 4 1996 3 nan nan 0 1996 4 101.644 0.638 2 1996 5 99.747 0.896 3 1996 6 96.517 1.724 3 1996 7 94.343 0.894 2 1996 8 91.897 1.105 4 1996 9 89.110 0.574 1 1996 10 89.014 0.967 3 1996 11 88.270 1.014 3 1996 12 nan nan 0 1997 1 87.704 0.827 2 1997 2 86.669 0.755 4 1997 3 85.782 0.332 2 1997 4 85.850 1.099 1 1997 5 82.850 0.519 1 1997 6 82.011 1.121 4 1997 7 79.940 0.905 2 1997 8 nan nan 0 1997 9 nan nan 0 1997 10 nan nan 0 1997 11 nan nan 0 1997 12 73.900 0.836 1 1998 1 73.449 1.464 2 1998 2 73.250 0.580 1 1998 3 71.720 0.608 1 1998 4 72.160 0.615 3 1998 5 70.802 0.552 2 1998 6 69.340 0.448 2 1998 7 67.421 0.873 3 1998 8 65.550 0.611 3 1998 9 62.953 0.312 5 1998 10 62.819 0.364 3 1998 11 61.941 0.388 4 1998 12 61.660 0.448 3 1999 1 61.040 0.497 1 1999 2 60.492 0.333 4 1999 3 60.337 0.291 3 1999 4 59.230 0.313 1 1999 5 58.715 0.483 4 1999 6 56.546 0.614 3 1999 7 55.281 0.553 4 1999 8 54.298 0.753 3 1999 9 53.634 0.414 3 1999 10 52.529 0.285 4 1999 11 51.842 0.309 3 1999 12 nan nan 0 2000 1 51.288 0.523 3 2000 2 50.776 0.468 3 2000 3 50.076 0.270 3 2000 4 49.465 0.309 2 2000 5 48.631 0.481 3 2000 6 47.790 0.246 1 2000 7 46.576 0.503 4 2000 8 45.548 0.197 4 2000 9 44.600 0.211 1 2000 10 nan nan 0 2000 11 43.422 0.294 3 2000 12 42.854 0.183 3 2001 1 nan nan 0 2001 2 42.568 0.472 4 2001 3 41.982 0.456 3 2001 4 41.430 0.287 1 2001 5 41.623 0.554 5 2001 6 40.274 0.610 3 2001 7 38.851 0.421 4 2001 8 38.201 0.308 5 2001 9 37.157 0.242 3 2001 10 36.977 0.194 4 2001 11 36.729 0.175 4 2001 12 36.432 0.210 4 2002 1 36.227 0.239 4 2002 2 35.675 0.235 2 2002 3 35.544 0.339 4 2002 4 35.300 0.232 4 2002 5 34.901 0.258 4 2002 6 34.081 0.421 4 2002 7 34.213 1.014 4 2002 8 33.362 0.497 4 2002 9 32.422 0.501 4 2002 10 31.542 0.457 5 2002 11 31.146 0.288 4 2002 12 30.895 0.299 4 2003 1 30.301 0.260 3 2003 2 30.319 0.265 4 2003 3 30.054 0.222 2 2003 4 29.656 0.191 5 2003 5 29.344 0.174 4 2003 6 28.713 0.286 4 2003 7 27.757 0.257 5 2003 8 27.519 0.226 4 2003 9 26.902 0.149 4 2003 10 26.459 0.183 5 2003 11 26.272 0.175 4 2003 12 26.286 0.141 3 2004 1 26.025 0.194 4 2004 2 25.564 0.221 4 2004 3 25.305 0.179 4 2004 4 25.287 0.186 4 2004 5 24.965 0.185 4 2004 6 24.287 0.247 5 2004 7 23.555 0.127 4 2004 8 23.085 0.160 4 2004 9 22.170 0.208 4 2004 10 21.853 0.210 4 2004 11 21.701 0.186 4 2004 12 21.573 0.211 4 2005 1 21.440 0.167 5 2005 2 21.060 0.117 5 2005 3 21.046 0.177 4 2005 4 20.797 0.141 4 2005 5 20.672 0.200 4 2005 6 20.198 0.203 5 2005 7 19.639 0.118 4 2005 8 18.985 0.151 5 2005 9 18.588 0.205 4 2005 10 18.500 0.213 4 2005 11 18.331 0.259 4 2005 12 18.036 0.219 4 2006 1 18.114 0.295 3 2006 2 17.717 0.192 5 2006 3 17.675 0.211 4 2006 4 17.426 0.208 4 2006 5 17.157 0.143 5 2006 6 16.732 0.219 4 2006 7 16.260 0.173 4 2006 8 15.939 0.208 4 2006 9 15.334 0.171 4 2006 10 15.472 0.204 4 2006 11 15.342 0.250 4 2006 12 15.159 0.196 4 2007 1 15.144 0.223 3 2007 2 14.972 0.273 4 2007 3 14.807 0.212 4 2007 4 14.703 0.221 4 2007 5 14.430 0.220 5 2007 6 13.960 0.178 4 2007 7 13.743 0.245 4 2007 8 13.355 0.210 5 2007 9 13.013 0.198 4 2007 10 12.939 0.117 4 2007 11 12.764 0.120 4 2007 12 12.765 0.178 4 2008 1 12.761 0.186 5 2008 2 12.555 0.230 3 2008 3 12.543 0.173 4 2008 4 12.441 0.187 3 2008 5 12.132 0.151 4 2008 6 12.024 0.189 4 2008 7 11.577 0.152 5 2008 8 11.317 0.147 4 2008 9 10.990 0.256 3 2008 10 10.942 0.212 5 2008 11 10.868 0.158 4 2008 12 10.935 0.177 5 2009 1 10.798 0.182 3 2009 2 10.688 0.233 4 2009 3 10.425 0.166 4 2009 4 10.532 0.150 4 2009 5 10.171 0.158 4 2009 6 10.135 0.221 5 2009 7 9.806 0.270 4 2009 8 9.392 0.149 4 2009 9 9.291 0.171 4 2009 10 9.259 0.148 4 2009 11 9.224 0.179 4 2009 12 9.043 0.153 5 2010 1 9.123 0.171 3 2010 2 8.877 0.149 4 2010 3 8.899 0.114 5 2010 4 8.784 0.119 4 2010 5 8.625 0.190 4 2010 6 8.371 0.173 5 2010 7 8.197 0.191 4 2010 8 8.031 0.145 3 2010 9 7.729 0.212 4 2010 10 7.551 0.245 4 2010 11 7.686 0.200 3 2010 12 7.535 0.143 5 2011 1 7.630 0.187 4 2011 2 7.598 0.192 4 2011 3 7.402 0.196 5 2011 4 7.387 0.148 4 2011 5 7.335 0.179 5 2011 6 7.074 0.149 4 2011 7 nan nan 0 2011 8 6.804 0.283 2 2011 9 6.647 0.164 5 2011 10 6.560 0.213 4 2011 11 6.715 0.179 4 2011 12 6.607 0.185 4 2012 1 6.411 0.290 4 2012 2 6.351 0.162 4 2012 3 6.076 0.175 5 2012 4 6.241 0.178 4 2012 5 6.088 0.182 4 2012 6 5.942 0.137 4 2012 7 5.746 0.209 4 2012 8 5.602 0.123 5 2012 9 5.479 0.129 4 2012 10 5.527 0.188 4 2012 11 5.386 0.205 5 2012 12 5.328 0.143 4 2013 1 5.262 0.125 4 2013 2 5.125 0.206 4 2013 3 5.115 0.174 4 2013 4 nan nan 0 2013 5 5.012 0.206 4 2013 6 4.918 0.118 4 2013 7 4.833 0.215 5 2013 8 4.850 0.306 2 2013 9 nan nan 0 2013 10 4.504 0.203 3 2013 11 4.482 0.136 3 2013 12 4.313 0.173 4 2014 1 4.298 0.173 4 2014 2 4.154 0.234 3 2014 3 4.584 0.211 2 2014 4 4.190 0.270 1 2014 5 4.244 0.174 4 2014 6 4.245 0.208 4 2014 7 4.197 0.129 5 2014 8 4.089 0.160 4 2014 9 3.893 0.210 4 2014 10 3.928 0.313 4 2014 11 3.764 0.227 4 2014 12 3.735 0.160 4 2015 1 3.691 0.170 4 2015 2 3.580 0.260 1 2015 3 3.672 0.133 5 2015 4 3.594 0.152 4 2015 5 3.644 0.137 4 2015 6 3.505 0.159 4 2015 7 3.414 0.144 4 2015 8 3.343 0.168 4 2015 9 3.236 0.166 5 2015 10 3.458 0.196 4 2015 11 3.211 0.165 4 2015 12 3.128 0.277 3 2016 1 3.192 0.168 5 2016 2 3.124 0.140 4 2016 3 3.063 0.171 5 2016 4 2.972 0.174 4 2016 5 2.964 0.105 5 2016 6 2.943 0.123 4 2016 7 2.889 0.155 3 2016 8 2.981 0.217 4 2016 9 2.805 0.173 4 2016 10 2.819 0.229 4 2016 11 2.810 0.262 1 2016 12 2.717 0.115 4 2017 1 2.772 0.156 3 2017 2 2.706 0.102 4 2017 3 2.696 0.152 5 2017 4 2.774 0.149 4 2017 5 2.545 0.109 5 2017 6 2.404 0.074 3 2017 7 2.421 0.083 4 2017 8 2.499 0.130 2 2017 9 2.489 0.075 4 2017 10 2.347 0.130 4 2017 11 2.268 0.103 4 2017 12 2.380 0.224 2 2018 1 2.336 0.145 3 2018 2 2.307 0.153 4 2018 3 2.300 0.193 3 2018 4 2.309 0.158 5 2018 5 2.329 0.192 3 2018 6 2.450 0.222 1 2018 7 nan nan 0 2018 8 2.093 0.095 2 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