# file: sum_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: SUM -- Summit, Greenland -- 72.58 N, 38.48 W, 3217.54 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 "sum_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 # N2OottoSUMyr N2OottoSUMmon N2OottoSUMm N2OottoSUMsd N2OottoSUMn 2004 1 nan nan 0 2004 2 nan nan 0 2004 3 nan nan 0 2004 4 nan nan 0 2004 5 nan nan 0 2004 6 317.735 0.588 2 2004 7 317.499 0.583 2 2004 8 317.760 0.886 1 2004 9 318.354 0.537 2 2004 10 318.407 0.490 2 2004 11 318.202 0.410 3 2004 12 318.918 0.697 2 2005 1 318.425 0.449 2 2005 2 318.820 0.577 2 2005 3 318.800 0.625 2 2005 4 318.920 0.879 1 2005 5 318.435 0.873 2 2005 6 318.606 0.482 2 2005 7 nan nan 0 2005 8 318.373 0.619 3 2005 9 nan nan 0 2005 10 318.584 0.694 2 2005 11 319.294 0.704 2 2005 12 318.670 1.957 1 2006 1 319.414 0.591 2 2006 2 319.264 0.586 2 2006 3 319.940 0.512 1 2006 4 319.459 0.491 2 2006 5 319.747 0.469 4 2006 6 319.325 0.657 3 2006 7 nan nan 0 2006 8 319.190 0.846 1 2006 9 nan nan 0 2006 10 319.350 0.593 2 2006 11 319.390 0.727 1 2006 12 319.397 0.593 2 2007 1 319.976 0.735 2 2007 2 320.034 1.334 2 2007 3 320.514 0.653 2 2007 4 320.750 0.629 1 2007 5 320.601 0.494 2 2007 6 320.680 0.538 2 2007 7 320.490 0.539 1 2007 8 320.991 0.518 4 2007 9 321.331 0.697 2 2007 10 nan nan 0 2007 11 nan nan 0 2007 12 nan nan 0 2008 1 nan nan 0 2008 2 nan nan 0 2008 3 nan nan 0 2008 4 nan nan 0 2008 5 nan nan 0 2008 6 321.628 0.567 6 2008 7 321.888 0.484 4 2008 8 321.543 0.666 3 2008 9 nan nan 0 2008 10 nan nan 0 2008 11 nan nan 0 2008 12 nan nan 0 2009 1 nan nan 0 2009 2 nan nan 0 2009 3 nan nan 0 2009 4 nan nan 0 2009 5 nan nan 0 2009 6 nan nan 0 2009 7 322.340 0.604 1 2009 8 nan nan 0 2009 9 nan nan 0 2009 10 nan nan 0 2009 11 nan nan 0 2009 12 nan nan 0 2010 1 nan nan 0 2010 2 nan nan 0 2010 3 323.530 0.638 1 2010 4 323.893 0.627 2 2010 5 323.387 0.805 2 2010 6 322.560 0.607 2 2010 7 322.317 0.414 3 2010 8 322.646 0.395 5 2010 9 322.958 0.410 4 2010 10 323.579 0.771 2 2010 11 323.514 0.639 2 2010 12 323.988 0.645 2 2011 1 324.040 0.432 2 2011 2 324.101 0.432 2 2011 3 324.442 0.559 2 2011 4 324.346 0.533 2 2011 5 324.474 0.793 2 2011 6 324.062 0.803 2 2011 7 323.706 0.419 4 2011 8 323.726 0.512 2 2011 9 323.724 0.539 3 2011 10 324.030 0.497 1 2011 11 324.820 0.621 1 2011 12 325.004 0.529 2 2012 1 325.098 0.544 2 2012 2 325.025 0.463 2 2012 3 325.205 0.481 2 2012 4 324.468 0.371 2 2012 5 324.470 0.610 1 2012 6 nan nan 0 2012 7 nan nan 0 2012 8 nan nan 0 2012 9 nan nan 0 2012 10 nan nan 0 2012 11 nan nan 0 2012 12 324.850 0.524 1 2013 1 324.912 0.767 2 2013 2 325.701 0.806 2 2013 3 325.376 0.700 2 2013 4 325.827 0.488 2 2013 5 325.120 0.523 1 2013 6 nan nan 0 2013 7 nan nan 0 2013 8 nan nan 0 2013 9 nan nan 0 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