# file: nwr_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: NWR -- Niwot Ridge, Colorado -- 40.05 N, 105.58 W, 3523 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 "nwr_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 # N2OottoNWRyr N2OottoNWRmon N2OottoNWRm N2OottoNWRsd N2OottoNWRn 1995 1 311.005 1.093 2 1995 2 310.545 0.754 3 1995 3 310.765 2.426 2 1995 4 311.242 0.951 3 1995 5 310.480 0.988 3 1995 6 310.517 1.518 2 1995 7 310.044 1.421 2 1995 8 310.470 2.622 2 1995 9 310.817 0.814 3 1995 10 310.893 1.157 5 1995 11 311.266 1.255 2 1995 12 311.004 1.383 4 1996 1 310.792 1.068 5 1996 2 311.441 0.686 4 1996 3 311.167 0.736 2 1996 4 311.163 1.049 4 1996 5 311.306 0.936 4 1996 6 311.924 0.580 3 1996 7 311.723 0.704 5 1996 8 312.063 0.579 2 1996 9 311.743 0.597 3 1996 10 312.099 0.560 4 1996 11 312.113 0.666 4 1996 12 311.942 0.431 3 1997 1 312.404 0.390 4 1997 2 312.130 0.519 4 1997 3 312.220 0.494 4 1997 4 312.516 0.491 3 1997 5 311.680 3.715 1 1997 6 311.953 0.478 3 1997 7 312.173 0.603 3 1997 8 312.741 0.411 4 1997 9 312.686 0.459 5 1997 10 313.042 0.654 3 1997 11 312.953 0.458 3 1997 12 313.040 0.464 5 1998 1 313.007 0.442 3 1998 2 313.618 0.707 4 1998 3 313.328 0.530 3 1998 4 313.049 0.467 3 1998 5 313.441 0.773 3 1998 6 313.138 0.415 3 1998 7 313.253 0.339 3 1998 8 312.457 1.287 3 1998 9 314.092 0.415 5 1998 10 313.793 0.373 3 1998 11 313.564 0.458 4 1998 12 313.860 0.463 5 1999 1 314.142 0.442 3 1999 2 313.811 0.372 4 1999 3 313.640 0.629 3 1999 4 313.651 0.479 2 1999 5 313.879 0.299 4 1999 6 313.684 0.469 4 1999 7 313.813 0.315 3 1999 8 314.125 0.383 3 1999 9 314.005 0.391 3 1999 10 314.156 0.238 3 1999 11 314.185 0.283 5 1999 12 314.331 0.663 2 2000 1 314.300 0.426 4 2000 2 314.401 0.388 5 2000 3 314.451 0.509 2 2000 4 314.826 0.869 3 2000 5 314.087 0.541 5 2000 6 314.745 0.989 3 2000 7 315.489 0.542 2 2000 8 315.829 0.583 3 2000 9 315.925 0.286 4 2000 10 315.872 0.417 2 2000 11 315.852 0.449 4 2000 12 315.170 0.771 4 2001 1 315.982 0.466 4 2001 2 316.212 0.436 3 2001 3 316.050 0.783 4 2001 4 315.022 0.516 3 2001 5 316.318 0.351 4 2001 6 316.618 0.679 3 2001 7 315.744 0.613 4 2001 8 316.646 0.407 2 2001 9 315.584 0.482 3 2001 10 316.251 0.487 5 2001 11 316.187 0.384 2 2001 12 316.502 0.429 4 2002 1 316.493 0.388 3 2002 2 316.985 0.698 2 2002 3 316.558 0.452 4 2002 4 315.728 0.368 4 2002 5 316.715 0.569 3 2002 6 315.991 0.743 3 2002 7 316.800 0.338 3 2002 8 316.998 0.536 3 2002 9 316.944 0.418 3 2002 10 317.126 0.382 2 2002 11 317.383 0.466 4 2002 12 317.444 0.453 4 2003 1 316.773 0.422 4 2003 2 nan nan 0 2003 3 316.530 0.465 3 2003 4 317.341 0.488 2 2003 5 317.273 0.370 4 2003 6 317.341 0.352 3 2003 7 317.692 0.407 3 2003 8 316.820 0.581 1 2003 9 317.503 0.369 5 2003 10 317.731 0.525 4 2003 11 317.610 0.515 4 2003 12 317.815 0.317 5 2004 1 317.614 0.427 2 2004 2 317.865 0.605 3 2004 3 318.086 0.398 4 2004 4 317.977 0.499 3 2004 5 317.114 0.470 2 2004 6 317.988 0.458 3 2004 7 318.184 0.528 3 2004 8 317.917 0.498 2 2004 9 317.803 0.440 3 2004 10 317.920 0.467 4 2004 11 318.531 1.186 2 2004 12 318.681 0.556 3 2005 1 318.907 0.459 3 2005 2 318.886 0.547 3 2005 3 318.986 0.416 4 2005 4 318.112 1.043 3 2005 5 318.387 0.707 2 2005 6 nan nan 0 2005 7 318.130 0.342 3 2005 8 319.046 0.542 4 2005 9 318.370 0.696 1 2005 10 319.200 0.710 1 2005 11 319.043 0.530 4 2005 12 318.820 0.582 4 2006 1 319.320 0.528 3 2006 2 319.436 0.783 4 2006 3 319.167 0.649 2 2006 4 319.150 0.482 4 2006 5 319.714 0.628 2 2006 6 319.955 0.724 3 2006 7 319.303 0.563 3 2006 8 319.626 0.481 2 2006 9 319.303 0.638 3 2006 10 319.942 0.694 3 2006 11 319.531 0.320 4 2006 12 319.960 0.534 3 2007 1 320.676 0.603 4 2007 2 320.105 0.599 3 2007 3 320.349 0.643 2 2007 4 320.580 1.167 2 2007 5 320.408 0.799 2 2007 6 320.188 0.382 2 2007 7 320.744 0.615 3 2007 8 322.004 0.550 2 2007 9 320.889 0.507 2 2007 10 321.185 0.391 3 2007 11 320.771 0.550 4 2007 12 320.686 1.466 2 2008 1 320.510 0.391 4 2008 2 320.778 0.424 4 2008 3 321.095 0.314 4 2008 4 321.115 0.405 5 2008 5 321.660 0.624 2 2008 6 321.180 0.495 5 2008 7 321.135 0.388 2 2008 8 321.947 0.830 2 2008 9 321.636 0.535 4 2008 10 321.743 0.394 4 2008 11 321.274 0.427 4 2008 12 322.074 0.659 5 2009 1 322.172 0.532 4 2009 2 321.913 0.532 3 2009 3 321.888 0.448 4 2009 4 322.060 0.407 2 2009 5 322.430 0.448 2 2009 6 322.135 0.481 3 2009 7 322.588 0.678 4 2009 8 322.620 0.511 4 2009 9 322.352 0.232 4 2009 10 322.803 0.405 3 2009 11 322.616 0.402 5 2009 12 322.475 0.378 4 2010 1 322.936 0.463 4 2010 2 323.118 0.514 4 2010 3 323.106 0.675 4 2010 4 322.803 0.573 4 2010 5 323.193 0.573 2 2010 6 323.885 0.591 2 2010 7 323.756 0.646 3 2010 8 323.332 0.504 3 2010 9 323.281 0.547 3 2010 10 324.036 0.580 2 2010 11 323.442 0.397 4 2010 12 323.786 0.414 3 2011 1 323.665 0.470 4 2011 2 323.712 0.494 4 2011 3 324.214 0.544 4 2011 4 324.471 0.699 2 2011 5 324.360 0.704 3 2011 6 323.808 0.548 3 2011 7 325.228 0.525 2 2011 8 324.708 0.471 2 2011 9 324.069 0.405 3 2011 10 324.867 0.421 4 2011 11 324.608 0.481 4 2011 12 325.231 0.439 3 2012 1 325.013 0.448 3 2012 2 325.083 0.399 5 2012 3 325.014 0.671 2 2012 4 325.576 0.361 3 2012 5 324.930 0.415 3 2012 6 325.288 0.427 3 2012 7 325.856 0.421 4 2012 8 325.642 0.457 2 2012 9 325.240 0.776 1 2012 10 325.626 0.536 4 2012 11 325.396 0.562 4 2012 12 325.679 0.612 3 2013 1 325.557 0.606 4 2013 2 326.420 0.549 2 2013 3 325.108 0.698 3 2013 4 326.103 0.717 3 2013 5 325.923 0.638 2 2013 6 326.300 1.103 1 2013 7 326.181 0.347 4 2013 8 326.574 0.872 3 2013 9 325.634 1.042 3 2013 10 nan nan 0 2013 11 326.645 0.510 2 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