# file: thd_N2O_MM.dat # # Atmospheric measurements of N2O (Nitrous Oxide) # # Measurements are from the NOAA/ESRL/GMD/HATS flask program # (http://www.esrl.noaa.gov/gmd/hats/flask/flasks.html). # Instrument ID: Otto # # Location: THD -- Trinidad Head, California -- 41.05 N, 124.15 W, 107 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. # # A known, systematic, low-side bias in the N2O measurements performed on Otto # has largely been eliminated since January of 2009. Prior to this date, # offsets are added to these flask data for the purpose of combining them with # baseline N2O data from other monitoring systems (see # http://www.esrl.noaa.gov/gmd/hats/ combined/N2O.html). The offsets -- 1.3 ppb # at Samoa and 0.6 ppb elsewhere -- were determined in reference to CATS data # (http://www.esrl.noaa.gov/gmd/hats/ insitu/cats) but have not been applied to # the Otto data reported here. # # These data represent monthly mean estimates computed using those data marked # with a 0 in flag column 7 of the companion file named "thd_N2O_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: Nitrous Oxide # data from the NOAA/ESRL halocarbons flask program. # # Calibration scale: NOAA 2006A # See http://www.esrl.noaa.gov/gmd/ccl/scales.html for more information about # calibration scales. # # Units: ppb # # Missing value: "nan" # # Data Columns: # yr Year # mon Month # m Monthly mean concentration of N2O in ppb # sd Standard deviation of the mean (or single-sample precision value) # n Number of samples # N2OottoTHDyr N2OottoTHDmon N2OottoTHDm N2OottoTHDsd N2OottoTHDn 2002 1 nan nan 0 2002 2 316.690 0.390 1 2002 3 316.579 0.379 4 2002 4 316.745 0.614 6 2002 5 316.799 0.556 8 2002 6 317.236 0.726 4 2002 7 317.361 0.607 4 2002 8 318.431 0.479 4 2002 9 317.714 0.660 4 2002 10 317.853 0.388 3 2002 11 317.697 0.363 4 2002 12 316.773 0.439 3 2003 1 316.844 0.421 4 2003 2 316.938 0.490 4 2003 3 317.200 0.592 3 2003 4 317.425 0.623 4 2003 5 317.691 0.479 6 2003 6 318.022 0.429 5 2003 7 318.671 0.770 5 2003 8 317.468 0.459 4 2003 9 318.193 0.811 4 2003 10 317.575 0.298 5 2003 11 318.650 0.435 4 2003 12 317.922 0.208 4 2004 1 317.301 0.355 4 2004 2 317.138 0.467 4 2004 3 317.787 0.727 5 2004 4 318.542 0.573 4 2004 5 317.825 0.595 4 2004 6 317.957 0.412 4 2004 7 318.175 0.917 4 2004 8 317.666 0.513 3 2004 9 317.792 0.943 5 2004 10 318.167 0.507 4 2004 11 319.343 0.854 3 2004 12 318.440 0.499 5 2005 1 318.768 0.543 3 2005 2 319.622 0.548 4 2005 3 319.174 0.379 4 2005 4 319.329 0.507 4 2005 5 319.777 0.925 5 2005 6 319.738 0.843 4 2005 7 319.847 0.591 4 2005 8 319.359 0.745 4 2005 9 319.793 1.051 4 2005 10 319.536 0.579 4 2005 11 320.068 0.693 3 2005 12 319.596 0.907 4 2006 1 319.872 0.378 3 2006 2 319.971 0.548 4 2006 3 320.080 0.503 3 2006 4 320.047 0.778 4 2006 5 320.166 0.500 3 2006 6 321.148 0.739 3 2006 7 320.889 0.545 3 2006 8 320.727 0.809 5 2006 9 320.813 0.521 4 2006 10 320.183 0.664 4 2006 11 320.422 0.510 5 2006 12 320.372 0.877 3 2007 1 320.938 0.545 3 2007 2 321.026 0.664 4 2007 3 320.829 0.773 4 2007 4 321.023 0.443 4 2007 5 321.426 0.787 2 2007 6 320.542 0.476 4 2007 7 321.119 0.945 4 2007 8 321.378 0.683 3 2007 9 321.969 0.594 3 2007 10 321.300 0.806 4 2007 11 320.680 0.602 3 2007 12 320.375 0.646 3 2008 1 321.050 0.579 3 2008 2 321.996 0.554 5 2008 3 321.503 0.630 3 2008 4 321.728 0.531 3 2008 5 321.951 0.475 4 2008 6 321.798 0.345 5 2008 7 322.319 0.478 4 2008 8 321.636 0.309 4 2008 9 322.092 0.480 4 2008 10 323.222 1.206 4 2008 11 322.362 0.536 5 2008 12 323.431 0.692 4 2009 1 322.209 0.398 4 2009 2 322.163 0.367 5 2009 3 322.802 0.501 3 2009 4 323.527 0.899 4 2009 5 322.813 0.622 3 2009 6 322.720 0.794 4 2009 7 323.850 0.776 4 2009 8 323.161 0.443 5 2009 9 323.185 0.807 3 2009 10 323.220 0.507 3 2009 11 323.062 0.407 4 2009 12 322.905 0.677 4 2010 1 322.930 0.406 1 2010 2 323.217 0.433 4 2010 3 323.645 0.461 4 2010 4 323.043 0.469 4 2010 5 322.986 0.604 4 2010 6 323.406 0.416 4 2010 7 324.443 0.443 5 2010 8 323.722 0.690 3 2010 9 323.787 0.400 3 2010 10 324.310 0.650 5 2010 11 323.733 0.608 2 2010 12 323.882 0.422 4 2011 1 324.269 0.329 3 2011 2 324.551 0.546 4 2011 3 324.414 0.650 4 2011 4 324.524 0.433 4 2011 5 324.897 0.379 4 2011 6 324.416 0.634 3 2011 7 325.604 0.837 5 2011 8 324.947 0.633 4 2011 9 325.227 1.043 5 2011 10 325.337 0.775 4 2011 11 324.852 0.450 4 2011 12 325.639 0.480 5 2012 1 325.132 0.548 3 2012 2 325.157 0.464 4 2012 3 325.898 0.689 2 2012 4 325.911 0.486 4 2012 5 325.654 0.471 3 2012 6 325.444 0.452 5 2012 7 325.537 0.441 3 2012 8 325.573 1.001 3 2012 9 326.134 0.846 5 2012 10 325.412 0.398 4 2012 11 325.557 0.332 4 2012 12 325.415 0.559 2 2013 1 326.120 0.658 1 2013 2 326.568 0.437 4 2013 3 326.335 0.356 5 2013 4 326.801 0.924 4 2013 5 327.483 0.585 4 2013 6 326.641 0.553 3 2013 7 327.520 0.691 3 2013 8 326.708 1.384 2 2013 9 326.610 15.568 1 2013 10 nan nan 0 2013 11 nan nan 0 2013 12 nan nan 0 2014 1 nan nan 0 2014 2 nan nan 0 2014 3 nan nan 0 2014 4 nan nan 0 2014 5 nan nan 0 2014 6 nan nan 0 2014 7 nan nan 0 2014 8 nan nan 0 2014 9 nan nan 0 2014 10 nan nan 0 2014 11 nan nan 0 2014 12 nan nan 0 2015 1 nan nan 0 2015 2 nan nan 0 2015 3 nan nan 0 2015 4 nan nan 0 2015 5 nan nan 0 2015 6 nan nan 0 2015 7 nan nan 0 2015 8 nan nan 0 2015 9 nan nan 0 2015 10 nan nan 0 2015 11 nan nan 0 2015 12 nan nan 0 2016 1 nan nan 0 2016 2 nan nan 0 2016 3 nan nan 0 2016 4 nan nan 0 2016 5 nan nan 0 2016 6 nan nan 0 2016 7 nan nan 0 2016 8 nan nan 0 2016 9 nan nan 0 2016 10 nan nan 0 2016 11 nan nan 0 2016 12 nan nan 0