# file: cgo_CCl4_MM.dat # # Atmospheric measurements of CCl4 (Carbon Tetrachloride, CT) # # Measurements are from the NOAA/ESRL/GMD/HATS flask program # (http://www.esrl.noaa.gov/gmd/hats/flask/flasks.html). # Instrument ID: Otto # # Location: CGO -- Cape Grim, Tasmania -- 40.68 S, 144.69 E, 94 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. # # CCl4 loss during storage in stainless-steel canisters arises most commonly at # high-latitude and/or high-altitude sites where the air is dry (i.e. ALT, BRW, # MLO, NWR, and SPO -- especially in winter). Extra efforts have been made to # flag samples suspected of suffering from this known artifact, thereby barring # them from inclusion in monthly mean estimates. The user is cautioned, # however, that small biases to the low side may nevertheless remain. # # These data represent monthly mean estimates computed using those data marked # with a 0 in flag column 7 of the companion file named "cgo_CCl4_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: Carbon Tetrachloride # data from the NOAA/ESRL halocarbons flask program. # # Calibration scale: NOAA 2008 # 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 CCl4 in ppt # sd Standard deviation of the mean (or single-sample precision value) # n Number of samples # CCl4ottoCGOyr CCl4ottoCGOmon CCl4ottoCGOm CCl4ottoCGOsd CCl4ottoCGOn 1995 1 nan nan 0 1995 2 nan nan 0 1995 3 nan nan 0 1995 4 nan nan 0 1995 5 nan nan 0 1995 6 nan nan 0 1995 7 nan nan 0 1995 8 nan nan 0 1995 9 nan nan 0 1995 10 103.283 0.421 2 1995 11 103.363 0.406 3 1995 12 nan nan 0 1996 1 102.834 0.413 2 1996 2 102.770 0.208 3 1996 3 103.128 0.230 4 1996 4 103.004 0.405 2 1996 5 102.598 0.288 4 1996 6 102.877 0.441 3 1996 7 102.859 0.318 3 1996 8 102.420 0.325 1 1996 9 102.415 0.432 4 1996 10 102.324 0.723 2 1996 11 102.420 0.326 1 1996 12 102.200 0.379 1 1997 1 102.069 0.266 2 1997 2 102.154 0.364 2 1997 3 102.465 0.233 5 1997 4 102.100 0.236 1 1997 5 102.229 0.311 3 1997 6 102.318 0.272 2 1997 7 101.680 0.363 5 1997 8 101.653 0.356 2 1997 9 101.949 0.300 3 1997 10 nan nan 0 1997 11 101.826 0.502 2 1997 12 101.442 0.350 4 1998 1 101.450 0.746 1 1998 2 101.985 0.387 2 1998 3 101.602 0.487 4 1998 4 100.990 0.384 2 1998 5 101.044 0.234 3 1998 6 100.966 0.272 3 1998 7 101.212 0.491 3 1998 8 100.480 0.203 1 1998 9 100.890 0.331 2 1998 10 100.615 0.203 4 1998 11 101.210 0.779 1 1998 12 100.852 0.208 2 1999 1 100.517 0.217 2 1999 2 100.623 0.638 3 1999 3 100.213 0.225 2 1999 4 100.885 0.182 4 1999 5 100.216 0.386 4 1999 6 99.869 0.181 4 1999 7 99.744 0.244 3 1999 8 99.803 0.119 2 1999 9 99.672 0.199 5 1999 10 99.829 0.325 6 1999 11 100.005 0.172 3 1999 12 99.900 0.266 2 2000 1 99.740 0.321 1 2000 2 99.613 0.236 3 2000 3 99.346 0.283 4 2000 4 99.086 0.381 3 2000 5 98.647 0.542 4 2000 6 98.809 0.820 3 2000 7 98.142 0.359 4 2000 8 98.398 0.288 4 2000 9 97.941 0.424 4 2000 10 98.250 0.244 4 2000 11 98.447 0.221 4 2000 12 98.613 0.470 3 2001 1 98.561 0.472 4 2001 2 97.639 0.171 3 2001 3 97.841 0.204 3 2001 4 97.494 0.158 3 2001 5 98.003 0.389 2 2001 6 97.594 0.327 4 2001 7 97.444 0.216 3 2001 8 97.628 0.598 3 2001 9 97.652 0.182 4 2001 10 97.352 0.508 5 2001 11 96.942 0.990 2 2001 12 97.493 0.313 2 2002 1 97.467 0.282 4 2002 2 97.044 0.545 3 2002 3 97.370 0.216 4 2002 4 96.502 0.161 2 2002 5 96.621 0.179 4 2002 6 96.685 0.163 5 2002 7 96.679 0.314 3 2002 8 96.398 0.153 4 2002 9 96.503 0.309 4 2002 10 96.457 0.366 4 2002 11 96.388 0.435 4 2002 12 95.965 0.354 4 2003 1 95.713 0.212 5 2003 2 95.722 0.175 4 2003 3 95.612 0.106 4 2003 4 95.413 0.340 3 2003 5 95.336 0.138 3 2003 6 95.540 0.306 3 2003 7 95.211 0.173 3 2003 8 95.017 0.386 3 2003 9 94.993 0.148 3 2003 10 94.834 0.179 3 2003 11 95.000 0.127 5 2003 12 94.892 0.153 3 2004 1 94.837 0.206 3 2004 2 94.725 0.135 7 2004 3 94.485 0.151 4 2004 4 94.315 0.172 2 2004 5 94.371 0.158 6 2004 6 94.281 0.160 6 2004 7 94.210 0.123 6 2004 8 94.300 0.188 3 2004 9 93.990 0.230 6 2004 10 93.765 0.177 5 2004 11 93.834 0.353 4 2004 12 94.060 0.151 5 2005 1 93.943 0.207 5 2005 2 93.743 0.155 5 2005 3 93.946 0.369 3 2005 4 93.436 0.163 5 2005 5 93.590 0.234 6 2005 6 93.126 0.173 2 2005 7 93.269 0.138 3 2005 8 93.234 0.243 5 2005 9 93.097 0.166 2 2005 10 92.773 0.177 2 2005 11 92.880 0.269 2 2005 12 92.805 0.232 3 2006 1 92.576 0.315 3 2006 2 92.770 0.186 4 2006 3 92.497 0.147 4 2006 4 92.318 0.200 4 2006 5 92.366 0.332 2 2006 6 92.321 0.162 3 2006 7 92.436 0.251 4 2006 8 92.179 0.308 3 2006 9 92.110 0.201 5 2006 10 91.945 0.139 4 2006 11 92.017 0.191 4 2006 12 91.990 0.245 3 2007 1 91.818 0.218 4 2007 2 91.440 0.290 2 2007 3 91.427 0.287 4 2007 4 nan nan 0 2007 5 91.052 0.190 4 2007 6 91.183 0.291 3 2007 7 91.136 0.251 4 2007 8 91.047 0.213 4 2007 9 90.896 0.403 5 2007 10 90.497 0.272 3 2007 11 90.742 0.218 3 2007 12 90.741 0.185 4 2008 1 90.678 0.194 4 2008 2 90.762 0.161 5 2008 3 90.185 0.369 4 2008 4 90.340 0.262 2 2008 5 89.945 0.643 2 2008 6 89.651 0.255 4 2008 7 89.415 0.202 7 2008 8 89.483 0.233 3 2008 9 89.193 0.177 5 2008 10 89.278 0.163 5 2008 11 89.070 0.173 4 2008 12 88.970 0.352 5 2009 1 88.924 0.361 2 2009 2 88.828 0.212 2 2009 3 88.811 0.151 4 2009 4 88.330 0.210 5 2009 5 88.430 0.175 3 2009 6 88.364 0.271 3 2009 7 88.196 0.168 3 2009 8 88.120 0.364 5 2009 9 88.313 0.293 3 2009 10 88.170 0.169 1 2009 11 88.432 0.214 4 2009 12 88.390 0.223 4 2010 1 88.198 0.212 4 2010 2 88.235 0.467 2 2010 3 88.118 0.245 3 2010 4 88.097 0.233 2 2010 5 87.778 0.310 3 2010 6 87.622 0.295 4 2010 7 87.451 0.187 3 2010 8 87.428 0.236 7 2010 9 87.294 0.183 4 2010 10 87.021 0.233 2 2010 11 87.068 0.232 3 2010 12 87.011 0.300 3 2011 1 86.964 0.158 3 2011 2 86.970 0.415 3 2011 3 86.883 0.333 4 2011 4 86.288 0.208 2 2011 5 86.006 0.228 4 2011 6 86.002 0.159 3 2011 7 85.807 0.381 3 2011 8 85.644 0.114 2 2011 9 85.675 0.224 3 2011 10 85.781 0.256 3 2011 11 85.744 0.244 4 2011 12 85.325 0.622 2 2012 1 85.801 0.151 3 2012 2 85.009 0.272 2 2012 3 85.223 0.193 3 2012 4 85.019 0.126 2 2012 5 85.209 0.298 2 2012 6 85.253 0.510 4 2012 7 84.714 0.455 3 2012 8 84.699 0.259 5 2012 9 84.471 0.278 4 2012 10 nan nan 0 2012 11 84.412 0.382 2 2012 12 84.444 0.185 3 2013 1 83.963 0.473 3 2013 2 84.856 0.163 4 2013 3 84.196 0.300 4 2013 4 83.984 0.200 2 2013 5 84.180 0.213 1 2013 6 nan nan 0 2013 7 nan nan 0 2013 8 nan nan 0 2013 9 83.290 1.892 1 2013 10 83.730 0.226 2 2013 11 83.451 0.216 2 2013 12 83.349 0.285 3 2014 1 83.390 0.165 1 2014 2 nan nan 0 2014 3 nan nan 0 2014 4 nan nan 0 2014 5 nan nan 0 2014 6 82.701 0.456 2 2014 7 82.636 0.245 2 2014 8 nan nan 0 2014 9 82.441 0.253 3 2014 10 82.471 0.206 2 2014 11 82.438 0.184 2 2014 12 82.268 0.232 3 2015 1 81.900 0.536 1 2015 2 81.958 0.193 2 2015 3 81.741 0.240 4 2015 4 81.645 0.293 2 2015 5 81.740 0.184 2 2015 6 81.540 0.290 3 2015 7 81.669 0.243 2 2015 8 81.571 0.261 2 2015 9 81.484 0.261 4 2015 10 nan nan 0 2015 11 81.440 0.392 1 2015 12 81.394 0.270 4 2016 1 81.087 0.252 3 2016 2 81.081 0.392 2 2016 3 80.995 0.566 3 2016 4 80.437 0.650 2 2016 5 80.566 0.443 3 2016 6 80.569 0.523 3 2016 7 79.840 0.552 1 2016 8 80.064 0.455 2 2016 9 80.290 0.338 1 2016 10 80.095 0.259 3 2016 11 80.150 0.245 1 2016 12 80.141 0.607 2 2017 1 79.960 0.230 1 2017 2 79.780 0.369 1 2017 3 nan nan 0 2017 4 79.178 0.368 2 2017 5 78.664 1.287 2 2017 6 79.048 0.278 4 2017 7 78.894 0.670 4 2017 8 78.597 0.376 3 2017 9 78.528 0.277 3 2017 10 79.040 0.712 3 2017 11 79.194 1.141 3 2017 12 79.408 0.409 4 2018 1 79.107 0.783 4 2018 2 78.804 0.327 3 2018 3 78.158 0.318 4 2018 4 78.976 0.483 4 2018 5 78.561 0.770 3 2018 6 77.990 0.253 1 2018 7 nan nan 0 2018 8 78.460 0.527 1 2018 9 77.657 0.639 3 2018 10 78.460 0.442 1 2018 11 78.062 0.423 5 2018 12 78.091 0.289 3 2019 1 77.859 0.425 3 2019 2 78.181 0.391 2 2019 3 78.295 0.643 3 2019 4 77.890 0.360 3 2019 5 78.410 0.776 3 2019 6 77.933 0.443 5 2019 7 77.692 0.453 2 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