# file: mhd_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: MHD -- Mace Head, Ireland -- 53.33 N, 9.90 W, 25 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 "mhd_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 # N2OottoMHDyr N2OottoMHDmon N2OottoMHDm N2OottoMHDsd N2OottoMHDn 1999 1 nan nan 0 1999 2 314.080 0.404 1 1999 3 nan nan 0 1999 4 313.280 0.548 1 1999 5 nan nan 0 1999 6 313.690 0.665 1 1999 7 314.586 0.284 2 1999 8 313.944 0.485 2 1999 9 nan nan 0 1999 10 nan nan 0 1999 11 nan nan 0 1999 12 nan nan 0 2000 1 nan nan 0 2000 2 nan nan 0 2000 3 nan nan 0 2000 4 nan nan 0 2000 5 nan nan 0 2000 6 nan nan 0 2000 7 nan nan 0 2000 8 nan nan 0 2000 9 nan nan 0 2000 10 nan nan 0 2000 11 nan nan 0 2000 12 nan nan 0 2001 1 nan nan 0 2001 2 nan nan 0 2001 3 nan nan 0 2001 4 nan nan 0 2001 5 316.310 0.453 1 2001 6 nan nan 0 2001 7 nan nan 0 2001 8 314.940 0.794 1 2001 9 315.851 0.700 2 2001 10 315.930 0.717 1 2001 11 nan nan 0 2001 12 nan nan 0 2002 1 316.690 0.481 1 2002 2 316.802 0.354 3 2002 3 316.830 0.491 1 2002 4 316.350 0.565 2 2002 5 nan nan 0 2002 6 nan nan 0 2002 7 nan nan 0 2002 8 nan nan 0 2002 9 316.210 0.863 1 2002 10 316.944 0.527 2 2002 11 317.566 0.635 2 2002 12 316.570 0.596 1 2003 1 316.770 0.431 1 2003 2 316.841 0.407 2 2003 3 316.949 0.513 3 2003 4 317.550 0.751 1 2003 5 317.659 0.593 2 2003 6 317.406 0.480 2 2003 7 317.693 0.312 2 2003 8 317.480 0.431 1 2003 9 317.205 0.273 2 2003 10 317.430 0.842 1 2003 11 317.642 0.357 3 2003 12 317.829 0.389 2 2004 1 317.187 0.566 2 2004 2 316.899 0.787 2 2004 3 317.827 0.467 2 2004 4 317.745 0.566 2 2004 5 317.615 0.565 2 2004 6 318.368 0.450 2 2004 7 317.961 1.188 2 2004 8 316.902 0.397 2 2004 9 316.599 0.442 2 2004 10 317.930 0.619 1 2004 11 318.814 0.709 2 2004 12 318.750 0.472 2 2005 1 319.486 0.453 2 2005 2 319.040 0.820 2 2005 3 320.100 0.542 1 2005 4 319.171 0.630 2 2005 5 320.028 0.751 3 2005 6 319.910 1.052 1 2005 7 319.417 0.759 2 2005 8 318.212 0.764 2 2005 9 318.665 0.489 2 2005 10 318.499 0.581 3 2005 11 319.341 0.535 2 2005 12 319.834 0.746 2 2006 1 320.150 0.749 1 2006 2 319.620 0.889 2 2006 3 319.928 0.701 2 2006 4 320.030 0.635 3 2006 5 320.914 0.849 2 2006 6 320.252 0.736 2 2006 7 320.350 0.511 2 2006 8 319.887 0.551 2 2006 9 319.436 0.579 2 2006 10 319.234 0.770 2 2006 11 320.069 0.757 2 2006 12 320.524 0.497 2 2007 1 321.350 0.782 1 2007 2 321.149 0.524 2 2007 3 319.721 0.943 2 2007 4 321.164 1.267 2 2007 5 319.730 0.912 2 2007 6 320.287 0.537 2 2007 7 319.910 0.948 2 2007 8 320.900 1.290 1 2007 9 320.588 0.398 2 2007 10 320.589 0.453 2 2007 11 320.038 0.494 2 2007 12 320.496 0.555 2 2008 1 320.799 1.331 2 2008 2 320.800 0.595 2 2008 3 321.222 0.616 3 2008 4 321.270 0.517 1 2008 5 nan nan 0 2008 6 320.767 0.453 3 2008 7 320.589 0.421 3 2008 8 320.720 0.551 1 2008 9 321.993 0.628 2 2008 10 321.756 0.555 2 2008 11 321.810 0.773 2 2008 12 322.131 0.717 2 2009 1 321.492 0.359 2 2009 2 322.192 0.435 2 2009 3 321.872 0.520 2 2009 4 322.514 0.473 3 2009 5 322.444 0.597 2 2009 6 nan nan 0 2009 7 322.211 0.438 2 2009 8 322.421 0.600 2 2009 9 321.706 0.703 2 2009 10 nan nan 0 2009 11 322.709 0.380 2 2009 12 322.770 0.484 1 2010 1 323.175 0.550 2 2010 2 323.062 0.700 2 2010 3 323.221 0.424 2 2010 4 323.038 0.601 2 2010 5 322.747 0.425 2 2010 6 323.038 0.544 2 2010 7 323.342 0.506 2 2010 8 322.194 0.413 2 2010 9 322.073 0.392 2 2010 10 323.435 0.583 2 2010 11 323.468 0.543 2 2010 12 324.008 0.470 2 2011 1 323.996 0.402 2 2011 2 324.147 0.721 2 2011 3 324.353 0.545 2 2011 4 324.863 0.496 2 2011 5 323.762 0.569 2 2011 6 323.439 0.567 2 2011 7 324.013 1.209 2 2011 8 323.575 0.799 2 2011 9 323.631 0.661 2 2011 10 324.978 0.537 2 2011 11 323.992 0.554 2 2011 12 325.244 0.771 2 2012 1 325.290 0.588 1 2012 2 325.063 0.399 3 2012 3 nan nan 0 2012 4 325.733 0.364 2 2012 5 325.104 0.471 3 2012 6 325.020 0.497 1 2012 7 324.800 0.396 2 2012 8 324.727 0.636 2 2012 9 325.152 0.506 2 2012 10 325.276 0.392 2 2012 11 325.386 0.560 2 2012 12 325.294 0.530 2 2013 1 325.218 1.060 2 2013 2 326.550 0.548 1 2013 3 326.090 0.683 1 2013 4 326.451 0.648 2 2013 5 326.548 0.743 2 2013 6 nan nan 0 2013 7 325.620 0.616 1 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