# file: psa_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: PSA -- Palmer Station, Antarctica -- 64.92 S, 64.00 W, 10 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 "psa_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 # CCl4ottoPSAyr CCl4ottoPSAmon CCl4ottoPSAm CCl4ottoPSAsd CCl4ottoPSAn 2001 1 nan nan 0 2001 2 nan nan 0 2001 3 97.180 0.147 1 2001 4 96.900 0.262 2 2001 5 96.774 0.243 2 2001 6 96.675 0.257 2 2001 7 96.720 0.240 1 2001 8 96.901 0.296 2 2001 9 96.481 0.306 2 2001 10 96.321 0.216 2 2001 11 96.260 0.192 1 2001 12 96.331 0.290 2 2002 1 96.430 0.165 1 2002 2 96.412 0.278 2 2002 3 96.280 0.369 1 2002 4 nan nan 0 2002 5 96.190 0.373 1 2002 6 95.559 0.484 2 2002 7 95.570 0.344 1 2002 8 95.620 0.331 1 2002 9 95.606 0.557 2 2002 10 nan nan 0 2002 11 95.444 0.242 2 2002 12 95.600 0.197 1 2003 1 95.280 0.191 1 2003 2 nan nan 0 2003 3 95.020 0.295 1 2003 4 nan nan 0 2003 5 94.610 0.198 1 2003 6 nan nan 0 2003 7 nan nan 0 2003 8 nan nan 0 2003 9 94.636 0.128 2 2003 10 94.740 0.287 1 2003 11 94.590 0.126 2 2003 12 94.489 0.142 2 2004 1 94.627 0.202 3 2004 2 94.464 0.262 2 2004 3 94.255 0.175 2 2004 4 93.937 0.233 2 2004 5 93.638 0.184 2 2004 6 93.737 0.153 3 2004 7 93.751 0.226 4 2004 8 93.740 0.153 2 2004 9 93.628 0.255 2 2004 10 93.819 0.198 2 2004 11 93.638 0.167 2 2004 12 93.621 0.144 2 2005 1 93.689 0.111 2 2005 2 93.424 0.330 3 2005 3 93.039 0.173 2 2005 4 93.013 0.287 2 2005 5 93.004 0.276 2 2005 6 92.935 0.177 2 2005 7 92.650 0.255 2 2005 8 92.814 0.153 3 2005 9 92.484 0.178 2 2005 10 92.470 0.178 2 2005 11 92.529 0.276 2 2005 12 92.471 0.202 2 2006 1 92.498 0.252 2 2006 2 92.274 0.180 3 2006 3 92.122 0.192 2 2006 4 91.860 0.232 1 2006 5 91.902 0.206 2 2006 6 91.721 0.170 2 2006 7 91.461 0.233 3 2006 8 91.460 0.143 1 2006 9 91.320 0.147 1 2006 10 91.268 0.269 2 2006 11 91.320 0.249 1 2006 12 91.090 0.226 1 2007 1 91.186 0.196 2 2007 2 91.224 0.136 2 2007 3 90.849 0.224 2 2007 4 90.770 0.396 2 2007 5 90.499 0.147 3 2007 6 90.347 0.580 2 2007 7 90.530 0.281 1 2007 8 90.400 0.196 2 2007 9 90.293 0.250 2 2007 10 90.053 0.260 2 2007 11 90.126 0.170 2 2007 12 90.165 0.159 3 2008 1 90.169 0.194 2 2008 2 90.080 0.312 1 2008 3 90.125 0.247 2 2008 4 89.301 0.530 2 2008 5 88.790 0.315 1 2008 6 88.704 0.657 2 2008 7 88.622 0.274 2 2008 8 88.670 0.260 1 2008 9 88.469 0.199 2 2008 10 88.591 0.233 2 2008 11 88.293 0.219 2 2008 12 88.101 0.256 2 2009 1 88.420 0.252 1 2009 2 88.300 0.312 1 2009 3 nan nan 0 2009 4 88.214 0.216 2 2009 5 88.121 0.181 2 2009 6 87.868 0.180 2 2009 7 88.048 0.171 2 2009 8 87.876 0.187 2 2009 9 87.920 0.170 2 2009 10 87.833 0.177 2 2009 11 88.100 0.517 1 2009 12 87.958 0.192 2 2010 1 88.030 0.224 1 2010 2 87.500 0.388 1 2010 3 87.160 0.187 1 2010 4 87.137 0.155 2 2010 5 86.951 0.159 3 2010 6 86.855 0.144 2 2010 7 86.887 0.189 2 2010 8 86.530 0.193 1 2010 9 86.699 0.188 2 2010 10 86.670 0.239 1 2010 11 86.525 0.251 3 2010 12 86.583 0.174 2 2011 1 86.601 0.167 2 2011 2 86.360 0.201 2 2011 3 85.773 0.188 2 2011 4 85.617 0.207 3 2011 5 85.684 0.139 2 2011 6 85.311 0.234 2 2011 7 85.675 0.194 2 2011 8 85.036 0.160 2 2011 9 85.067 0.226 2 2011 10 85.218 0.222 2 2011 11 85.116 0.218 2 2011 12 85.039 0.171 3 2012 1 84.667 0.209 2 2012 2 84.576 0.279 2 2012 3 84.876 0.214 2 2012 4 84.748 0.149 3 2012 5 84.366 0.366 2 2012 6 84.520 0.242 1 2012 7 84.500 0.264 1 2012 8 84.521 0.264 2 2012 9 84.170 0.400 2 2012 10 84.298 0.446 2 2012 11 84.140 0.264 1 2012 12 84.250 0.547 1 2013 1 nan nan 0 2013 2 nan nan 0 2013 3 84.070 0.307 1 2013 4 83.701 0.379 2 2013 5 83.750 0.182 3 2013 6 83.516 0.216 2 2013 7 83.638 0.208 2 2013 8 83.740 0.163 2 2013 9 82.960 0.164 1 2013 10 83.370 0.324 2 2013 11 82.684 0.246 2 2013 12 82.629 0.196 2 2014 1 82.934 0.303 2 2014 2 82.790 0.228 2 2014 3 81.810 0.314 1 2014 4 81.680 0.223 3 2014 5 81.660 0.314 2 2014 6 81.695 0.403 2 2014 7 81.373 0.190 2 2014 8 81.194 0.276 2 2014 9 81.190 0.211 2 2014 10 81.393 0.326 2 2014 11 81.540 0.241 1 2014 12 81.525 0.228 2 2015 1 81.685 0.363 2 2015 2 81.451 0.488 2 2015 3 81.085 0.279 2 2015 4 80.924 0.246 3 2015 5 80.640 0.322 1 2015 6 80.452 0.235 2 2015 7 80.416 0.293 2 2015 8 80.456 0.188 2 2015 9 80.221 0.270 2 2015 10 nan nan 0 2015 11 79.896 0.390 3 2015 12 nan nan 0 2016 1 80.095 0.390 3 2016 2 79.600 0.448 1 2016 3 79.922 0.558 2 2016 4 79.460 0.345 2 2016 5 79.274 0.382 2 2016 6 79.090 0.541 1 2016 7 79.610 0.690 1 2016 8 79.004 0.347 2 2016 9 78.810 0.348 1 2016 10 78.848 0.431 2 2016 11 78.968 0.265 2 2016 12 79.136 0.284 2 2017 1 78.928 0.253 2 2017 2 78.871 0.256 2 2017 3 78.500 0.468 1 2017 4 78.400 0.323 2 2017 5 78.122 0.267 2 2017 6 78.132 0.202 2 2017 7 78.483 0.226 2 2017 8 78.070 0.295 2 2017 9 78.269 0.293 2 2017 10 78.097 0.224 2 2017 11 77.848 0.240 2 2017 12 77.816 0.268 2 2018 1 77.844 0.248 2 2018 2 77.730 0.324 1 2018 3 nan nan 0 2018 4 nan nan 0 2018 5 nan nan 0 2018 6 nan nan 0 2018 7 nan nan 0 2018 8 nan nan 0 2018 9 nan nan 0 2018 10 78.410 0.235 1 2018 11 78.040 0.331 2 2018 12 77.950 0.216 2 2019 1 78.044 0.188 2 2019 2 78.020 0.349 1 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