# file: mlo_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: MLO -- Mauna Loa, Hawaii -- 19.54 N, 155.58 W, 3397 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 "mlo_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 # MCottoMLOyr MCottoMLOmon MCottoMLOm MCottoMLOsd MCottoMLOn 1995 1 108.956 1.294 2 1995 2 nan nan 0 1995 3 104.850 0.752 1 1995 4 105.312 2.376 2 1995 5 103.660 0.709 1 1995 6 nan nan 0 1995 7 nan nan 0 1995 8 100.920 0.748 1 1995 9 98.481 0.627 3 1995 10 100.858 1.883 4 1995 11 97.615 0.850 4 1995 12 98.351 1.638 3 1996 1 97.250 1.144 3 1996 2 97.389 1.117 2 1996 3 95.223 1.108 4 1996 4 93.865 1.255 3 1996 5 92.069 0.772 4 1996 6 89.506 0.790 4 1996 7 88.252 0.928 2 1996 8 87.241 1.248 3 1996 9 86.441 0.912 4 1996 10 84.381 0.542 4 1996 11 83.876 1.060 4 1996 12 83.401 1.018 4 1997 1 82.361 1.011 2 1997 2 82.126 1.015 3 1997 3 81.112 0.915 5 1997 4 79.509 2.029 2 1997 5 79.630 1.222 4 1997 6 77.282 1.182 5 1997 7 75.199 0.660 4 1997 8 74.797 0.626 4 1997 9 73.075 0.721 2 1997 10 73.014 0.886 4 1997 11 72.520 0.714 1 1997 12 71.966 0.862 5 1998 1 70.392 0.715 4 1998 2 69.913 1.365 4 1998 3 69.537 0.859 4 1998 4 68.146 0.568 3 1998 5 67.639 1.234 5 1998 6 66.213 0.480 3 1998 7 64.239 0.645 5 1998 8 63.579 0.803 5 1998 9 62.596 0.750 2 1998 10 60.122 0.294 3 1998 11 60.384 0.578 3 1998 12 59.773 0.306 4 1999 1 58.776 0.413 4 1999 2 58.490 0.641 5 1999 3 57.939 0.373 4 1999 4 56.662 1.084 3 1999 5 55.897 0.263 4 1999 6 54.768 0.385 4 1999 7 52.966 0.525 4 1999 8 52.189 0.390 5 1999 9 51.887 0.425 3 1999 10 51.189 0.546 4 1999 11 50.590 0.257 4 1999 12 50.409 0.304 5 2000 1 49.756 0.363 3 2000 2 48.742 0.314 5 2000 3 48.279 0.449 3 2000 4 46.644 0.502 2 2000 5 45.954 0.287 5 2000 6 45.284 0.383 4 2000 7 44.527 0.330 4 2000 8 43.478 0.677 4 2000 9 42.947 0.181 4 2000 10 42.263 0.336 4 2000 11 42.442 0.395 4 2000 12 41.479 0.235 3 2001 1 41.370 0.216 3 2001 2 40.926 0.251 4 2001 3 40.289 0.329 3 2001 4 39.821 0.492 3 2001 5 38.545 0.213 3 2001 6 37.905 0.481 4 2001 7 37.584 0.367 3 2001 8 36.247 0.179 3 2001 9 35.940 0.227 4 2001 10 35.784 0.255 3 2001 11 35.794 0.163 4 2001 12 35.614 0.317 3 2002 1 34.615 0.602 3 2002 2 34.489 0.373 3 2002 3 34.100 0.409 5 2002 4 33.850 0.212 4 2002 5 32.799 0.441 4 2002 6 32.147 0.436 5 2002 7 31.515 0.218 4 2002 8 30.859 0.368 4 2002 9 30.765 0.211 5 2002 10 30.110 0.292 4 2002 11 29.980 0.257 4 2002 12 30.028 0.220 5 2003 1 29.838 0.367 4 2003 2 29.082 0.274 4 2003 3 28.911 0.659 5 2003 4 28.438 0.385 4 2003 5 27.301 0.194 6 2003 6 27.151 0.301 6 2003 7 26.499 0.640 4 2003 8 26.018 0.426 3 2003 9 25.923 0.232 4 2003 10 25.470 0.200 4 2003 11 25.646 0.158 4 2003 12 25.108 0.316 4 2004 1 25.022 0.217 3 2004 2 24.440 0.258 5 2004 3 24.124 0.480 4 2004 4 24.341 0.209 4 2004 5 23.698 0.185 4 2004 6 22.938 0.367 5 2004 7 22.736 0.178 3 2004 8 22.120 0.179 4 2004 9 21.563 0.255 5 2004 10 21.324 0.326 4 2004 11 20.822 0.145 4 2004 12 20.709 0.146 5 2005 1 20.517 0.167 4 2005 2 20.321 0.172 4 2005 3 20.066 0.293 5 2005 4 19.754 0.183 4 2005 5 19.230 0.158 5 2005 6 18.904 0.194 3 2005 7 18.468 0.131 4 2005 8 18.189 0.200 5 2005 9 18.181 0.172 4 2005 10 17.857 0.257 4 2005 11 17.715 0.263 5 2005 12 17.530 0.241 4 2006 1 17.222 0.237 4 2006 2 17.029 0.167 5 2006 3 16.619 0.246 4 2006 4 16.768 0.227 4 2006 5 16.441 0.383 5 2006 6 15.899 0.177 4 2006 7 15.214 0.308 3 2006 8 15.132 0.233 5 2006 9 14.894 0.229 4 2006 10 14.882 0.262 4 2006 11 14.643 0.164 5 2006 12 14.679 0.295 4 2007 1 14.593 0.213 4 2007 2 14.370 0.220 5 2007 3 14.165 0.190 4 2007 4 14.114 0.248 4 2007 5 13.589 0.219 4 2007 6 13.244 0.243 4 2007 7 12.914 0.130 4 2007 8 12.727 0.139 5 2007 9 12.602 0.194 4 2007 10 12.555 0.229 4 2007 11 12.365 0.200 5 2007 12 12.444 0.277 4 2008 1 12.373 0.245 4 2008 2 12.091 0.191 5 2008 3 11.812 0.168 4 2008 4 11.542 0.185 5 2008 5 11.475 0.179 4 2008 6 11.157 0.198 4 2008 7 10.934 0.190 5 2008 8 10.792 0.130 4 2008 9 10.711 0.189 4 2008 10 10.587 0.246 5 2008 11 10.375 0.215 4 2008 12 10.380 0.178 4 2009 1 10.358 0.191 5 2009 2 10.225 0.283 4 2009 3 10.007 0.251 3 2009 4 9.838 0.212 5 2009 5 9.678 0.195 4 2009 6 9.455 0.201 3 2009 7 9.245 0.179 5 2009 8 8.965 0.194 2 2009 9 8.891 0.201 5 2009 10 8.937 0.215 4 2009 11 8.829 0.173 4 2009 12 8.722 0.182 4 2010 1 8.569 0.227 3 2010 2 nan nan 0 2010 3 8.436 0.181 5 2010 4 8.292 0.151 3 2010 5 8.267 0.159 5 2010 6 7.846 0.204 4 2010 7 7.739 0.166 4 2010 8 7.707 0.130 5 2010 9 7.494 0.161 4 2010 10 7.441 0.200 3 2010 11 7.377 0.199 4 2010 12 7.244 0.135 4 2011 1 7.306 0.149 4 2011 2 7.284 0.130 4 2011 3 7.092 0.153 4 2011 4 6.873 0.181 3 2011 5 6.799 0.194 5 2011 6 6.780 0.204 3 2011 7 6.498 0.107 4 2011 8 6.410 0.165 5 2011 9 6.324 0.131 4 2011 10 6.424 0.167 4 2011 11 6.254 0.151 5 2011 12 6.248 0.154 4 2012 1 6.183 0.182 3 2012 2 5.800 0.183 4 2012 3 5.863 0.112 4 2012 4 5.792 0.169 5 2012 5 5.779 0.123 3 2012 6 5.652 0.140 4 2012 7 5.487 0.112 5 2012 8 5.421 0.209 4 2012 9 5.268 0.186 3 2012 10 5.114 0.188 5 2012 11 5.121 0.210 4 2012 12 5.065 0.141 4 2013 1 5.001 0.195 4 2013 2 5.098 0.295 4 2013 3 5.165 0.200 4 2013 4 4.958 0.117 5 2013 5 4.761 0.179 4 2013 6 4.582 0.250 3 2013 7 4.515 0.138 4 2013 8 4.431 0.165 3 2013 9 4.268 0.222 3 2013 10 4.403 0.435 2 2013 11 4.280 0.214 4 2013 12 4.197 0.175 4 2014 1 4.370 0.394 4 2014 2 4.077 0.142 4 2014 3 3.960 0.194 4 2014 4 3.762 0.137 5 2014 5 3.968 0.125 3 2014 6 3.995 0.193 4 2014 7 3.863 0.144 4 2014 8 3.892 0.157 4 2014 9 3.777 0.137 5 2014 10 3.705 0.173 4 2014 11 3.708 0.235 3 2014 12 3.593 0.206 5 2015 1 3.496 0.173 4 2015 2 3.479 0.201 4 2015 3 3.408 0.187 4 2015 4 3.358 0.198 4 2015 5 3.460 0.147 4 2015 6 3.405 0.140 5 2015 7 3.352 0.159 3 2015 8 3.139 0.117 4 2015 9 3.221 0.165 5 2015 10 3.095 0.173 4 2015 11 3.035 0.203 3 2015 12 2.975 0.176 5 2016 1 2.976 0.183 4 2016 2 2.955 0.146 3 2016 3 2.965 0.164 3 2016 4 2.901 0.159 4 2016 5 2.859 0.175 5 2016 6 2.795 0.113 3 2016 7 2.798 0.150 4 2016 8 2.670 0.171 5 2016 9 2.656 0.159 3 2016 10 2.676 0.122 4 2016 11 2.622 0.171 5 2016 12 2.747 0.314 3 2017 1 2.558 0.136 3 2017 2 2.554 0.161 5 2017 3 2.503 0.191 4 2017 4 2.518 0.111 4 2017 5 2.443 0.097 5 2017 6 2.465 0.126 4 2017 7 2.248 0.113 5 2017 8 2.292 0.128 4 2017 9 2.369 0.110 4 2017 10 2.301 0.153 5 2017 11 2.264 0.139 4 2017 12 2.279 0.155 4 2018 1 2.211 0.143 5 2018 2 2.306 0.160 4 2018 3 2.204 0.173 4 2018 4 2.215 0.111 4 2018 5 2.277 0.161 3 2018 6 2.011 0.211 2 2018 7 nan nan 0 2018 8 2.100 0.204 1 2018 9 2.006 0.141 6 2018 10 2.141 0.217 4 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