# file: global_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: Global -- Monthly Global-Hemispheric Means # 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 global and hemispheric mean estimates computed # using data from the monthly companion files named *_MC_MM.dat, where * # refers to a 3-character baseline site code. For any given month in the more # recent period, data from as many as 12 sites may be used to derive the global # mean, including as many as 4 sites in the southern hemisphere and up to 8 in # the northern hemisphere. From north to south, these baseline sites include # ALT, SUM, BRW, MHD, THD, NWR, MLO, KUM, SMO, CGO, PSA, and SPO: # # ALT - Alert, Canada 82.45 N 62.51 W 190 m # SUM - Summit, Greenland 72.60 N 38.42 W 3209 m # BRW - Barrow, Alaska 71.32 N 156.61 W 11 m # MHD - Mace Head, Ireland 53.33 N 9.90 W 5 m # THD - Trinidad Head, California 41.05 N 124.15 W 107 m # NWR - Niwot Ridge, Colorado 40.05 N 105.59 W 3523 m # MLO - Mauna Loa, Hawaii 19.54 N 155.58 W 3397 m # KUM - Cape Kumukahi, Hawaii 19.52 N 154.82 W 3 m # SMO - Tutuila, Samoa 14.25 S 170.56 W 42 m # CGO - Cape Grim, Tasmania 40.68 S 144.69 E 94 m # PSA - Palmer Station, Antarctica 64.92 S 64.00 W 10 m # SPO - South Pole, Antarctica 89.98 S 24.80 W 2810 m # # The global and hemispheric uncertainties reported here are bootstrapped from # 1000 'resamples' of the input monthly means drawn in accordance with the # uncertainties reported in the companion files. # # 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 # # Mising value: "nan" # # Data Columns: # yr Year # mon Month # NHm Northern Hemispheric mean concentration of MC in ppt # NHsd Northern Hemispheric standard deviation # SHm Southern Hemispheric mean concentration # SHsd Southern Hemispheric standard deviation # GLm Global mean concentration # GLsd Global standard deviation # MCottoyr MCottomon MCottoNHm MCottoNHsd MCottoSHm MCottoSHsd MCottoGLm MCottoGLsd 1995 1 nan nan nan nan nan nan 1995 2 nan nan nan nan nan nan 1995 3 nan nan nan nan nan nan 1995 4 nan nan nan nan nan nan 1995 5 nan nan nan nan nan nan 1995 6 nan nan nan nan nan nan 1995 7 nan nan nan nan nan nan 1995 8 nan nan nan nan nan nan 1995 9 nan nan nan nan nan nan 1995 10 103.366 1.074 95.856 0.504 99.611 0.585 1995 11 101.146 0.393 94.880 0.505 98.013 0.312 1995 12 100.682 0.686 93.381 0.695 97.032 0.493 1996 1 99.701 1.065 92.769 1.867 96.235 1.100 1996 2 100.203 0.770 90.754 1.067 95.478 0.663 1996 3 98.699 0.461 89.748 0.551 94.223 0.365 1996 4 96.055 0.567 89.700 0.467 92.877 0.376 1996 5 94.845 0.430 89.081 0.501 91.963 0.331 1996 6 91.766 0.807 86.522 0.599 89.144 0.498 1996 7 90.123 0.868 86.256 0.584 88.189 0.530 1996 8 88.330 0.433 85.665 0.445 86.997 0.310 1996 9 87.423 0.476 85.117 0.677 86.270 0.431 1996 10 86.398 0.327 83.420 1.355 84.909 0.693 1996 11 85.112 0.500 81.342 0.436 83.227 0.336 1996 12 84.935 0.503 80.730 0.924 82.832 0.522 1997 1 84.474 0.679 80.333 0.581 82.403 0.440 1997 2 83.687 0.450 78.181 0.495 80.934 0.333 1997 3 83.172 0.445 77.915 0.633 80.544 0.378 1997 4 81.354 0.662 76.581 0.436 78.968 0.390 1997 5 80.584 0.466 76.373 0.288 78.478 0.271 1997 6 79.283 0.851 75.678 0.305 77.481 0.448 1997 7 76.819 0.413 75.044 0.369 75.932 0.277 1997 8 75.435 0.378 74.777 0.448 75.106 0.299 1997 9 74.519 0.513 73.677 0.502 74.098 0.356 1997 10 73.704 0.467 72.348 0.613 73.026 0.386 1997 11 73.701 0.364 71.466 0.427 72.583 0.282 1997 12 73.387 0.531 70.010 0.629 71.698 0.416 1998 1 71.992 0.485 69.352 0.552 70.672 0.372 1998 2 71.319 0.721 68.340 0.452 69.829 0.430 1998 3 70.253 0.455 66.437 0.439 68.345 0.315 1998 4 69.448 0.378 65.666 0.472 67.557 0.298 1998 5 68.765 0.525 65.291 0.409 67.028 0.330 1998 6 66.907 0.437 64.849 0.479 65.878 0.312 1998 7 64.868 0.326 64.742 0.324 64.805 0.226 1998 8 63.911 0.373 63.993 0.440 63.952 0.289 1998 9 61.989 0.418 61.687 0.223 61.838 0.234 1998 10 61.266 0.193 61.163 0.519 61.215 0.278 1998 11 60.839 0.216 60.096 0.557 60.467 0.301 1998 12 60.228 0.134 58.441 0.377 59.334 0.203 1999 1 59.821 0.168 57.608 0.326 58.714 0.184 1999 2 59.067 0.252 56.459 0.268 57.763 0.188 1999 3 58.449 0.261 55.787 0.193 57.118 0.162 1999 4 57.242 0.324 55.362 0.267 56.302 0.214 1999 5 56.790 0.294 54.158 0.349 55.474 0.229 1999 6 55.496 0.231 54.040 0.284 54.768 0.182 1999 7 53.766 0.253 53.391 0.186 53.579 0.158 1999 8 52.630 0.167 52.913 0.233 52.772 0.141 1999 9 52.387 0.185 52.005 0.290 52.196 0.173 1999 10 51.673 0.222 51.370 0.304 51.521 0.183 1999 11 51.122 0.235 50.777 0.209 50.949 0.155 1999 12 50.760 0.178 49.494 0.359 50.127 0.206 2000 1 50.144 0.191 48.806 0.227 49.475 0.148 2000 2 49.522 0.192 47.947 0.274 48.735 0.164 2000 3 49.113 0.201 47.225 0.458 48.169 0.249 2000 4 47.786 0.358 46.385 0.396 47.085 0.263 2000 5 46.874 0.199 45.408 0.204 46.141 0.139 2000 6 46.097 0.204 45.215 0.223 45.656 0.153 2000 7 44.884 0.218 44.613 0.161 44.748 0.136 2000 8 44.101 0.271 44.023 0.408 44.062 0.238 2000 9 43.293 0.190 43.140 0.227 43.216 0.144 2000 10 42.919 0.137 42.639 0.381 42.779 0.203 2000 11 42.714 0.144 42.018 0.117 42.366 0.092 2000 12 42.115 0.157 41.499 0.202 41.807 0.127 2001 1 41.906 0.130 40.265 0.285 41.086 0.158 2001 2 41.281 0.255 39.221 0.120 40.251 0.144 2001 3 40.832 0.209 39.173 0.140 40.002 0.128 2001 4 40.253 0.259 38.799 0.156 39.526 0.153 2001 5 39.331 0.169 38.568 0.236 38.950 0.144 2001 6 38.702 0.306 37.918 0.174 38.310 0.178 2001 7 37.610 0.193 37.655 0.153 37.633 0.122 2001 8 36.990 0.133 37.316 0.169 37.153 0.106 2001 9 36.447 0.116 36.769 0.295 36.608 0.158 2001 10 36.219 0.103 36.333 0.221 36.276 0.123 2001 11 35.992 0.158 35.546 0.242 35.769 0.146 2001 12 35.893 0.136 35.147 0.162 35.520 0.108 2002 1 35.428 0.208 34.336 0.228 34.882 0.157 2002 2 35.231 0.127 33.918 0.164 34.574 0.103 2002 3 34.930 0.145 33.289 0.158 34.109 0.109 2002 4 34.424 0.191 32.894 0.176 33.659 0.129 2002 5 33.655 0.147 32.451 0.161 33.053 0.111 2002 6 32.917 0.160 32.135 0.139 32.526 0.104 2002 7 31.979 0.158 31.788 0.207 31.883 0.126 2002 8 31.448 0.149 31.772 0.149 31.610 0.105 2002 9 31.135 0.092 31.274 0.250 31.204 0.133 2002 10 30.662 0.102 30.635 0.504 30.649 0.255 2002 11 30.503 0.136 30.038 0.187 30.270 0.115 2002 12 30.548 0.101 29.747 0.149 30.148 0.090 2003 1 29.966 0.123 28.939 0.174 29.452 0.107 2003 2 29.749 0.100 28.361 0.191 29.055 0.106 2003 3 29.379 0.197 27.930 0.141 28.655 0.123 2003 4 28.789 0.196 27.519 0.205 28.154 0.142 2003 5 28.297 0.173 27.248 0.139 27.773 0.111 2003 6 27.956 0.131 27.192 0.209 27.574 0.122 2003 7 27.058 0.189 26.841 0.181 26.950 0.130 2003 8 26.640 0.119 26.451 0.178 26.545 0.106 2003 9 26.281 0.087 26.200 0.148 26.241 0.085 2003 10 25.926 0.115 25.867 0.165 25.897 0.101 2003 11 25.892 0.088 25.502 0.150 25.697 0.084 2003 12 25.672 0.126 24.987 0.157 25.329 0.099 2004 1 25.376 0.105 24.670 0.181 25.023 0.104 2004 2 25.135 0.100 24.227 0.161 24.681 0.094 2004 3 24.755 0.180 23.523 0.148 24.139 0.116 2004 4 24.742 0.135 23.360 0.137 24.051 0.097 2004 5 24.099 0.130 22.993 0.150 23.546 0.096 2004 6 23.540 0.134 22.851 0.088 23.195 0.081 2004 7 22.902 0.104 22.600 0.119 22.751 0.081 2004 8 22.363 0.107 22.295 0.110 22.329 0.076 2004 9 21.949 0.086 21.758 0.197 21.853 0.106 2004 10 21.529 0.097 21.309 0.146 21.419 0.090 2004 11 21.173 0.080 20.933 0.110 21.053 0.069 2004 12 21.074 0.084 20.482 0.110 20.778 0.070 2005 1 20.795 0.079 20.119 0.148 20.457 0.083 2005 2 20.709 0.074 19.863 0.115 20.286 0.068 2005 3 20.544 0.115 19.535 0.126 20.040 0.086 2005 4 20.377 0.097 19.261 0.124 19.819 0.079 2005 5 19.816 0.086 19.203 0.091 19.509 0.064 2005 6 19.458 0.097 18.875 0.102 19.167 0.070 2005 7 19.046 0.099 18.736 0.119 18.891 0.077 2005 8 18.557 0.090 18.584 0.137 18.571 0.082 2005 9 18.279 0.086 18.283 0.125 18.281 0.077 2005 10 18.113 0.095 18.057 0.138 18.085 0.083 2005 11 17.991 0.093 17.688 0.146 17.839 0.088 2005 12 17.950 0.093 17.466 0.133 17.708 0.081 2006 1 17.635 0.108 17.071 0.175 17.353 0.104 2006 2 17.541 0.097 16.800 0.167 17.171 0.097 2006 3 17.266 0.130 16.364 0.159 16.815 0.103 2006 4 17.115 0.116 16.149 0.111 16.632 0.078 2006 5 16.758 0.137 15.862 0.097 16.310 0.085 2006 6 16.157 0.088 15.778 0.110 15.967 0.070 2006 7 15.639 0.103 15.537 0.120 15.588 0.082 2006 8 15.400 0.093 15.445 0.122 15.423 0.078 2006 9 15.186 0.074 15.344 0.132 15.265 0.076 2006 10 15.123 0.086 15.095 0.134 15.109 0.080 2006 11 14.956 0.084 14.792 0.133 14.874 0.080 2006 12 14.919 0.116 14.438 0.156 14.678 0.095 2007 1 14.835 0.096 14.235 0.127 14.535 0.082 2007 2 14.679 0.097 14.040 0.208 14.359 0.116 2007 3 14.430 0.097 13.808 0.131 14.119 0.081 2007 4 14.346 0.112 13.557 0.133 13.951 0.087 2007 5 14.091 0.083 13.322 0.097 13.707 0.065 2007 6 13.650 0.106 13.091 0.094 13.370 0.070 2007 7 13.282 0.065 13.043 0.123 13.163 0.070 2007 8 12.929 0.069 12.906 0.092 12.918 0.059 2007 9 12.811 0.089 12.822 0.112 12.816 0.073 2007 10 12.661 0.091 12.555 0.124 12.608 0.077 2007 11 12.555 0.087 12.403 0.120 12.479 0.074 2007 12 12.572 0.104 12.242 0.130 12.407 0.082 2008 1 12.538 0.100 11.909 0.151 12.224 0.090 2008 2 12.362 0.084 11.724 0.127 12.043 0.076 2008 3 12.182 0.089 11.627 0.115 11.904 0.074 2008 4 12.008 0.083 11.366 0.109 11.687 0.068 2008 5 11.763 0.081 11.226 0.098 11.494 0.063 2008 6 11.532 0.102 11.175 0.135 11.353 0.083 2008 7 11.239 0.072 11.130 0.096 11.184 0.059 2008 8 10.981 0.076 11.094 0.113 11.038 0.069 2008 9 10.863 0.100 10.916 0.170 10.890 0.100 2008 10 10.776 0.107 10.692 0.140 10.734 0.088 2008 11 10.614 0.096 10.506 0.151 10.560 0.088 2008 12 10.576 0.090 10.275 0.145 10.426 0.085 2009 1 10.491 0.110 10.206 0.154 10.349 0.092 2009 2 10.456 0.124 10.006 0.152 10.231 0.096 2009 3 10.301 0.098 9.824 0.137 10.062 0.085 2009 4 10.069 0.087 9.691 0.104 9.880 0.068 2009 5 9.902 0.083 9.534 0.126 9.718 0.076 2009 6 9.696 0.099 9.462 0.105 9.579 0.073 2009 7 9.483 0.071 9.371 0.089 9.427 0.055 2009 8 9.167 0.072 9.286 0.092 9.227 0.059 2009 9 9.071 0.070 9.147 0.085 9.109 0.056 2009 10 9.032 0.076 9.052 0.120 9.042 0.072 2009 11 8.931 0.077 8.813 0.144 8.872 0.081 2009 12 8.884 0.077 8.715 0.106 8.800 0.065 2010 1 8.767 0.078 8.507 0.130 8.637 0.073 2010 2 8.728 0.076 8.280 0.152 8.504 0.085 2010 3 8.619 0.067 8.204 0.100 8.412 0.061 2010 4 8.547 0.071 8.090 0.115 8.319 0.068 2010 5 8.442 0.069 8.052 0.111 8.247 0.066 2010 6 8.134 0.080 7.913 0.137 8.024 0.080 2010 7 7.951 0.079 7.865 0.103 7.908 0.066 2010 8 7.796 0.066 7.723 0.087 7.759 0.054 2010 9 7.627 0.069 7.691 0.110 7.659 0.065 2010 10 7.550 0.088 7.563 0.124 7.556 0.075 2010 11 7.528 0.092 7.339 0.148 7.433 0.087 2010 12 7.364 0.085 7.321 0.133 7.342 0.078 2011 1 7.415 0.067 7.211 0.115 7.313 0.066 2011 2 7.335 0.066 7.106 0.132 7.220 0.075 2011 3 7.233 0.075 6.887 0.115 7.060 0.069 2011 4 7.168 0.078 6.781 0.129 6.974 0.075 2011 5 7.133 0.073 6.825 0.117 6.979 0.068 2011 6 6.949 0.090 6.705 0.124 6.827 0.075 2011 7 6.743 0.052 6.636 0.090 6.689 0.052 2011 8 6.555 0.072 6.610 0.108 6.583 0.065 2011 9 6.440 0.062 6.487 0.108 6.463 0.061 2011 10 6.444 0.095 6.457 0.128 6.450 0.081 2011 11 6.465 0.083 6.331 0.117 6.398 0.071 2011 12 6.386 0.071 6.241 0.138 6.313 0.076 2012 1 6.275 0.090 6.065 0.115 6.170 0.074 2012 2 6.136 0.082 5.990 0.129 6.063 0.076 2012 3 6.049 0.087 5.955 0.106 6.002 0.068 2012 4 6.001 0.084 5.744 0.087 5.873 0.058 2012 5 5.890 0.061 5.670 0.102 5.780 0.058 2012 6 5.771 0.062 5.707 0.111 5.739 0.063 2012 7 5.643 0.060 5.689 0.094 5.666 0.056 2012 8 5.478 0.087 5.545 0.113 5.511 0.070 2012 9 5.331 0.076 5.520 0.122 5.426 0.072 2012 10 5.260 0.081 5.368 0.110 5.314 0.068 2012 11 5.224 0.080 5.367 0.110 5.295 0.069 2012 12 5.219 0.067 5.156 0.139 5.187 0.077 2013 1 5.118 0.079 5.117 0.116 5.118 0.071 2013 2 5.186 0.104 4.995 0.142 5.090 0.088 2013 3 5.126 0.073 4.833 0.130 4.979 0.075 2013 4 4.979 0.067 4.766 0.119 4.872 0.067 2013 5 4.810 0.068 4.717 0.094 4.764 0.058 2013 6 4.779 0.093 4.707 0.114 4.743 0.074 2013 7 4.653 0.071 4.710 0.122 4.681 0.070 2013 8 4.605 0.085 4.665 0.175 4.635 0.097 2013 9 4.453 0.121 4.557 0.113 4.505 0.083 2013 10 4.420 0.161 4.338 0.114 4.379 0.096 2013 11 4.359 0.090 4.311 0.149 4.335 0.087 2013 12 4.288 0.081 4.296 0.141 4.292 0.081 2014 1 4.247 0.120 4.078 0.114 4.162 0.080 2014 2 4.164 0.071 3.886 0.112 4.025 0.066 2014 3 4.063 0.083 3.880 0.110 3.972 0.071 2014 4 3.950 0.074 3.985 0.131 3.968 0.074 2014 5 4.106 0.071 3.981 0.151 4.043 0.085 2014 6 4.030 0.081 4.008 0.147 4.019 0.084 2014 7 3.997 0.067 4.049 0.104 4.023 0.063 2014 8 3.954 0.070 4.010 0.109 3.982 0.066 2014 9 3.827 0.071 3.936 0.115 3.881 0.068 2014 10 3.762 0.069 3.828 0.109 3.795 0.064 2014 11 3.737 0.085 3.787 0.133 3.762 0.080 2014 12 3.665 0.074 3.685 0.120 3.675 0.071 2015 1 3.597 0.079 3.666 0.119 3.631 0.071 2015 2 3.587 0.080 3.545 0.120 3.566 0.073 2015 3 3.532 0.087 3.537 0.111 3.535 0.071 2015 4 3.516 0.077 3.491 0.097 3.504 0.063 2015 5 3.554 0.083 3.485 0.091 3.519 0.062 2015 6 3.518 0.063 3.491 0.122 3.505 0.069 2015 7 3.354 0.067 3.395 0.101 3.375 0.060 2015 8 3.241 0.057 3.283 0.106 3.262 0.059 2015 9 3.217 0.074 3.225 0.123 3.221 0.074 2015 10 3.211 0.087 3.282 0.119 3.247 0.072 2015 11 3.083 0.078 3.144 0.117 3.114 0.070 2015 12 3.030 0.078 3.103 0.103 3.066 0.064 2016 1 3.095 0.122 3.010 0.097 3.052 0.078 2016 2 3.045 0.067 3.000 0.124 3.023 0.071 2016 3 3.026 0.062 2.928 0.090 2.977 0.057 2016 4 2.930 0.078 2.865 0.091 2.897 0.060 2016 5 2.945 0.066 2.874 0.102 2.909 0.061 2016 6 2.891 0.056 2.865 0.089 2.878 0.053 2016 7 2.775 0.058 2.803 0.091 2.789 0.053 2016 8 2.728 0.063 2.840 0.101 2.784 0.060 2016 9 2.729 0.068 2.770 0.094 2.750 0.058 2016 10 2.709 0.065 2.754 0.093 2.732 0.058 2016 11 2.693 0.077 2.722 0.109 2.707 0.067 2016 12 2.698 0.092 2.682 0.096 2.690 0.067 2017 1 2.671 0.066 2.614 0.077 2.643 0.051 2017 2 2.640 0.072 2.586 0.090 2.613 0.058 2017 3 2.618 0.062 2.525 0.100 2.571 0.059 2017 4 2.584 0.069 2.506 0.104 2.545 0.063 2017 5 2.510 0.058 2.492 0.118 2.501 0.064 2017 6 2.455 0.058 2.405 0.074 2.430 0.048 2017 7 2.382 0.056 2.401 0.075 2.391 0.047 2017 8 2.340 0.053 2.423 0.084 2.381 0.049 2017 9 2.360 0.053 2.431 0.090 2.395 0.052 2017 10 2.320 0.060 2.393 0.079 2.357 0.049 2017 11 2.292 0.063 2.323 0.089 2.308 0.055 2017 12 2.302 0.057 2.303 0.113 2.302 0.063 2018 1 2.282 0.061 2.201 0.105 2.242 0.061 2018 2 2.267 0.072 2.178 0.116 2.222 0.068 2018 3 nan nan nan nan nan nan 2018 4 nan nan nan nan nan nan 2018 5 nan nan nan nan nan nan 2018 6 nan nan nan nan nan nan 2018 7 nan nan nan nan nan nan 2018 8 nan nan nan nan nan nan 2018 9 nan nan nan nan nan nan 2018 10 nan nan nan nan nan nan 2018 11 nan nan nan nan nan nan 2018 12 nan nan nan nan nan nan