# File: insitu_global_MC.txt # Date: 2023-08-29 # # Data use policy see https://gml.noaa.gov/hats/hats_datause.html # # Methyl chlorform (MC) hemispheric and global monthly means from the NOAA/GML # Chromatograph for Atmospheric Trace Species (CATS) data from baseline observatories (Barrow, Alaska; # Summit, Greenland; Niwot Ridge, Colorado; Mauna Loa, Hawaii; American Samoa; South Pole). # This work was funded in part by the Atmospheric Chemistry Project of NOAA's Climate and # Global Change Program. # # Citation: # G.S. Dutton and B.D. Hall (2023), # Global Atmospheric Methyl chlorform Hemispheric and Global Mean Dry Air Mole Fractions from the # NOAA GML Halocarbons in situ Network, 1998-2023, Version: 2023-08-29, # https://doi.org/10.7289/V5X0659V # # For contact information see https://gml.noaa.gov/about/stafflist.html # # Calibration scale used: NOAA 2003 # More information about the calibration scale can be found at: https://gml.noaa.gov/ccl/ # # See (http://www.esrl.noaa.gov/gmd/obop/) for station statistics and personnel. # # The CATS GCs sample air once an hour. Global monthly data are provided in parts-per-trillion, ppt. # Abbreviations used: # yr=year, mon=month, m=monthly data; gc=type of sample--in situ GC data, sd=standard deviation of samples, # n=number of samples, brw=Pt. Barrow, Alaska, sum=Summit, Greenland, nwr= Niwot Ridge, Colorado # mlo=Mauna Loa, Hawaii, smo = American Samoa, spo=South Pole, Antarctica # NAN=not a number or no data, and space(s) is the delimiter. # # # The standard deviation (unc) reported is the estimate of insturmental precision. # The standard deviation (sd) reported is the estimate of insturmental precision and atmospheric variablity. # insitu_MC_YYYY insitu_MC_MM insitu_NH_MC insitu_NH_MC_sd insitu_SH_MC insitu_SH_MC_sd insitu_Global_MC insitu_Global_MC_sd 1998 2 nan nan nan nan nan nan 1998 3 nan nan nan nan nan nan 1998 4 nan nan nan nan nan nan 1998 5 nan nan nan nan nan nan 1998 6 nan nan nan nan nan nan 1998 7 nan nan nan nan nan nan 1998 8 nan nan nan nan nan nan 1998 9 nan nan nan nan nan nan 1998 10 nan nan nan nan nan nan 1998 11 nan nan nan nan nan nan 1998 12 nan nan 59.314 0.187 nan nan 1999 1 nan nan 58.581 0.161 nan nan 1999 2 nan nan 57.874 0.193 nan nan 1999 3 nan nan 56.884 0.171 nan nan 1999 4 57.556 0.209 56.146 0.207 56.851 0.294 1999 5 55.570 0.204 55.494 0.225 55.532 0.304 1999 6 54.531 0.326 54.934 0.196 54.733 0.381 1999 7 53.493 0.419 54.111 0.320 53.802 0.527 1999 8 52.532 0.480 53.042 0.162 52.787 0.506 1999 9 51.779 0.449 52.197 0.214 51.988 0.497 1999 10 51.303 0.405 51.258 0.271 51.281 0.487 1999 11 50.667 0.680 49.909 0.176 50.288 0.703 1999 12 50.157 0.599 48.763 0.146 49.460 0.616 2000 1 49.512 0.590 48.050 0.167 48.781 0.613 2000 2 48.811 0.549 47.537 0.138 48.174 0.566 2000 3 48.063 0.475 47.003 0.165 47.533 0.503 2000 4 47.282 0.450 46.367 0.165 46.825 0.479 2000 5 46.355 0.394 45.714 0.146 46.035 0.420 2000 6 45.753 0.257 45.121 0.132 45.437 0.289 2000 7 45.368 0.213 44.562 0.159 44.965 0.266 2000 8 44.673 0.284 44.049 0.177 44.361 0.334 2000 9 44.043 0.250 43.357 0.226 43.700 0.337 2000 10 43.862 0.095 42.537 0.254 43.199 0.271 2000 11 43.753 0.122 41.699 0.169 42.726 0.208 2000 12 43.339 0.145 41.053 0.144 42.196 0.204 2001 1 42.850 0.121 40.553 0.157 41.701 0.198 2001 2 42.489 0.149 40.193 0.196 41.341 0.247 2001 3 42.052 0.136 39.603 0.232 40.828 0.269 2001 4 41.032 0.196 38.864 0.150 39.948 0.247 2001 5 39.742 0.192 38.223 0.105 38.983 0.219 2001 6 38.811 0.186 37.805 0.108 38.308 0.215 2001 7 37.712 0.109 37.613 0.159 37.663 0.193 2001 8 36.946 0.133 37.254 0.238 37.100 0.273 2001 9 36.488 0.112 36.798 0.297 36.643 0.318 2001 10 36.195 0.128 35.953 0.237 36.074 0.270 2001 11 35.947 0.168 35.078 0.337 35.512 0.377 2001 12 35.734 0.166 34.232 0.165 34.983 0.234 2002 1 35.391 0.197 33.817 0.131 34.604 0.237 2002 2 35.023 0.191 33.317 0.119 34.170 0.226 2002 3 34.470 0.182 32.782 0.108 33.626 0.212 2002 4 33.847 0.165 32.258 0.106 33.052 0.196 2002 5 33.135 0.158 31.852 0.100 32.493 0.187 2002 6 32.393 0.152 31.480 0.103 31.937 0.184 2002 7 31.580 0.123 31.251 0.132 31.416 0.180 2002 8 31.030 0.132 30.997 0.186 31.014 0.229 2002 9 30.686 0.129 30.705 0.118 30.695 0.175 2002 10 30.299 0.148 30.063 0.193 30.181 0.243 2002 11 29.945 0.116 29.340 0.142 29.642 0.183 2002 12 29.561 0.113 28.653 0.118 29.107 0.163 2003 1 29.383 0.124 28.157 0.195 28.770 0.231 2003 2 29.079 0.142 27.831 0.140 28.455 0.199 2003 3 28.735 0.122 27.424 0.175 28.080 0.213 2003 4 28.265 0.127 27.250 0.204 27.757 0.240 2003 5 27.820 0.140 27.104 0.175 27.462 0.224 2003 6 27.151 0.113 26.915 0.106 27.033 0.156 2003 7 26.610 0.119 26.572 0.123 26.591 0.171 2003 8 26.266 0.155 26.387 0.134 26.326 0.205 2003 9 25.976 0.131 25.987 0.152 25.981 0.201 2003 10 25.654 0.151 25.558 0.163 25.606 0.222 2003 11 25.368 0.169 25.095 0.112 25.231 0.202 2003 12 25.038 0.179 24.484 0.205 24.761 0.272 2004 1 24.727 0.157 23.984 0.175 24.356 0.235 2004 2 24.433 0.189 23.601 0.106 24.017 0.217 2004 3 24.247 0.173 23.231 0.113 23.739 0.207 2004 4 23.953 0.160 22.964 0.115 23.459 0.197 2004 5 23.402 0.139 22.667 0.089 23.035 0.166 2004 6 22.905 0.150 22.433 0.098 22.669 0.179 2004 7 22.641 0.375 22.129 0.096 22.385 0.387 2004 8 22.245 0.401 21.776 0.128 22.011 0.421 2004 9 21.520 0.375 21.436 0.156 21.478 0.406 2004 10 21.081 0.282 21.147 0.134 21.114 0.313 2004 11 21.172 0.284 20.713 0.155 20.943 0.323 2004 12 20.993 0.273 20.192 0.143 20.592 0.308 2005 1 20.505 0.233 19.771 0.090 20.138 0.249 2005 2 20.341 0.326 19.442 0.100 19.891 0.341 2005 3 20.502 0.306 19.319 0.117 19.911 0.328 2005 4 20.126 0.308 19.215 0.098 19.671 0.324 2005 5 19.670 0.276 19.021 0.094 19.346 0.291 2005 6 19.141 0.189 18.864 0.102 19.002 0.215 2005 7 18.605 0.208 18.620 0.120 18.613 0.240 2005 8 18.240 0.178 18.226 0.096 18.233 0.202 2005 9 18.128 0.216 17.878 0.089 18.003 0.233 2005 10 17.985 0.222 17.649 0.116 17.817 0.250 2005 11 17.908 0.188 17.335 0.104 17.621 0.215 2005 12 17.800 0.169 16.978 0.112 17.389 0.202 2006 1 17.521 0.181 16.750 0.091 17.136 0.203 2006 2 17.258 0.223 16.460 0.117 16.859 0.252 2006 3 17.123 0.209 16.137 0.076 16.630 0.222 2006 4 16.967 0.224 15.797 0.089 16.382 0.241 2006 5 16.583 0.200 15.629 0.075 16.106 0.214 2006 6 16.021 0.186 15.404 0.088 15.712 0.205 2006 7 15.581 0.140 15.253 0.110 15.417 0.178 2006 8 15.390 0.236 15.134 0.109 15.262 0.260 2006 9 15.237 0.337 15.043 0.101 15.140 0.352 2006 10 15.004 0.232 14.816 0.098 14.910 0.252 2006 11 14.831 0.158 14.572 0.110 14.701 0.193 2006 12 14.762 0.129 14.307 0.088 14.534 0.156 2007 1 14.656 0.166 14.079 0.074 14.368 0.182 2007 2 14.473 0.169 13.855 0.083 14.164 0.188 2007 3 14.322 0.181 13.584 0.088 13.953 0.202 2007 4 14.151 0.201 13.351 0.092 13.751 0.221 2007 5 13.881 0.198 13.220 0.082 13.551 0.214 2007 6 13.520 0.250 13.110 0.093 13.315 0.267 2007 7 13.224 0.265 12.938 0.117 13.081 0.290 2007 8 13.005 0.345 12.823 0.103 12.914 0.361 2007 9 12.857 0.385 12.667 0.117 12.762 0.403 2007 10 12.611 0.309 12.418 0.094 12.515 0.323 2007 11 12.496 0.132 12.149 0.086 12.322 0.158 2007 12 12.482 0.108 12.054 0.081 12.268 0.135 2008 1 12.464 0.088 11.923 0.099 12.193 0.132 2008 2 12.286 0.093 11.708 0.087 11.997 0.127 2008 3 12.116 0.157 11.423 0.085 11.770 0.178 2008 4 11.818 0.161 11.249 0.079 11.534 0.180 2008 5 11.587 0.127 11.145 0.103 11.366 0.164 2008 6 11.384 0.061 11.117 0.084 11.250 0.104 2008 7 11.088 0.084 11.019 0.078 11.053 0.114 2008 8 10.785 0.059 10.840 0.076 10.813 0.096 2008 9 10.598 0.070 10.655 0.088 10.626 0.112 2008 10 10.476 0.066 10.497 0.073 10.487 0.099 2008 11 10.391 0.060 10.373 0.096 10.382 0.114 2008 12 10.353 0.063 10.181 0.084 10.267 0.105 2009 1 10.284 0.073 10.024 0.079 10.154 0.108 2009 2 10.190 0.072 9.825 0.102 10.007 0.125 2009 3 10.082 0.074 9.634 0.087 9.858 0.114 2009 4 9.877 0.067 9.419 0.085 9.648 0.108 2009 5 9.651 0.059 9.318 0.072 9.484 0.093 2009 6 9.405 0.058 9.083 0.086 9.244 0.104 2009 7 9.181 0.054 9.031 0.087 9.106 0.102 2009 8 9.018 0.051 9.013 0.113 9.015 0.124 2009 9 8.884 0.054 9.163 0.114 9.023 0.126 2009 10 8.754 0.052 9.275 0.132 9.014 0.142 2009 11 8.649 0.049 9.288 0.181 8.969 0.188 2009 12 8.595 0.057 8.951 0.224 8.773 0.231 2010 1 8.535 0.057 8.676 0.121 8.605 0.134 2010 2 8.459 0.055 8.490 0.137 8.474 0.148 2010 3 8.353 0.064 8.494 0.199 8.424 0.209 2010 4 8.226 0.057 8.384 0.132 8.305 0.144 2010 5 8.069 0.058 8.090 0.127 8.079 0.140 2010 6 7.875 0.056 7.828 0.116 7.852 0.129 2010 7 7.685 0.054 7.886 0.154 7.786 0.163 2010 8 7.562 0.052 7.931 0.138 7.747 0.147 2010 9 7.461 0.055 7.901 0.123 7.681 0.135 2010 10 7.389 0.054 7.888 0.153 7.639 0.163 2010 11 7.311 0.060 7.792 0.156 7.551 0.167 2010 12 7.253 0.061 7.646 0.121 7.450 0.135 2011 1 7.186 0.058 7.448 0.196 7.317 0.205 2011 2 7.126 0.059 7.210 0.159 7.168 0.169 2011 3 7.022 0.060 6.986 0.165 7.004 0.176 2011 4 6.919 0.060 7.033 0.133 6.976 0.146 2011 5 6.866 0.059 6.867 0.214 6.867 0.222 2011 6 6.769 0.056 6.595 0.192 6.682 0.200 2011 7 6.541 0.050 6.423 0.265 6.482 0.270 2011 8 6.308 0.058 6.352 0.315 6.330 0.320 2011 9 6.234 0.057 6.168 0.315 6.201 0.320 2011 10 6.212 0.056 6.131 0.295 6.171 0.301 2011 11 6.210 0.062 6.010 0.297 6.110 0.303 2011 12 6.185 0.060 5.891 0.337 6.038 0.342 2012 1 6.154 0.091 5.783 0.405 5.969 0.415 2012 2 6.061 0.096 5.724 0.410 5.893 0.421 2012 3 5.986 0.089 5.604 0.391 5.795 0.401 2012 4 5.883 0.094 5.671 0.289 5.777 0.304 2012 5 5.768 0.096 5.672 0.277 5.720 0.293 2012 6 5.602 0.063 5.638 0.280 5.620 0.287 2012 7 5.444 0.093 5.505 0.249 5.474 0.266 2012 8 5.318 0.094 5.430 0.194 5.374 0.216 2012 9 5.220 0.085 5.435 0.237 5.328 0.251 2012 10 5.154 0.081 5.482 0.204 5.318 0.220 2012 11 5.115 0.076 5.406 0.146 5.260 0.164 2012 12 5.107 0.080 5.300 0.112 5.203 0.138