# file: alt_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: ALT -- Alert, Canada -- 82.45 N, 62.51 W, 200 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 "alt_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 # N2OottoALTyr N2OottoALTmon N2OottoALTm N2OottoALTsd N2OottoALTn 1994 1 nan nan 0 1994 2 nan nan 0 1994 3 nan nan 0 1994 4 nan nan 0 1994 5 nan nan 0 1994 6 nan nan 0 1994 7 nan nan 0 1994 8 nan nan 0 1994 9 nan nan 0 1994 10 nan nan 0 1994 11 nan nan 0 1994 12 310.734 1.235 2 1995 1 311.601 1.128 2 1995 2 311.221 0.755 2 1995 3 310.603 0.667 4 1995 4 310.640 0.646 4 1995 5 310.225 1.226 3 1995 6 310.969 1.442 3 1995 7 310.461 1.060 2 1995 8 310.194 1.260 4 1995 9 310.491 0.824 3 1995 10 310.952 1.546 2 1995 11 310.492 0.961 4 1995 12 311.869 1.916 2 1996 1 311.530 1.190 3 1996 2 310.832 1.328 4 1996 3 nan nan 0 1996 4 311.066 0.863 2 1996 5 312.277 0.828 4 1996 6 312.034 0.597 3 1996 7 311.958 0.791 3 1996 8 312.097 0.672 4 1996 9 311.700 0.704 1 1996 10 312.329 0.716 2 1996 11 312.290 0.646 3 1996 12 nan nan 0 1997 1 312.618 0.587 2 1997 2 312.554 0.789 3 1997 3 313.049 0.892 2 1997 4 312.330 18.911 1 1997 5 312.990 0.670 1 1997 6 312.811 0.505 4 1997 7 312.711 0.983 2 1997 8 nan nan 0 1997 9 nan nan 0 1997 10 313.193 0.437 3 1997 11 nan nan 0 1997 12 313.391 0.643 2 1998 1 313.474 0.590 3 1998 2 313.880 0.675 1 1998 3 313.480 0.664 1 1998 4 313.237 0.612 3 1998 5 313.263 0.332 2 1998 6 313.460 0.432 1 1998 7 313.213 0.462 3 1998 8 313.025 0.413 3 1998 9 313.035 0.322 5 1998 10 313.821 0.676 3 1998 11 313.892 0.433 4 1998 12 314.288 0.551 3 1999 1 314.648 0.526 3 1999 2 314.272 0.469 4 1999 3 314.400 0.386 3 1999 4 314.500 0.634 1 1999 5 315.386 0.965 4 1999 6 314.058 0.356 3 1999 7 314.422 1.491 3 1999 8 315.035 0.533 2 1999 9 313.978 0.308 3 1999 10 314.498 0.616 4 1999 11 314.420 0.577 1 1999 12 nan nan 0 2000 1 314.476 0.378 4 2000 2 314.300 0.439 3 2000 3 314.703 0.624 3 2000 4 315.814 0.904 2 2000 5 315.914 0.864 4 2000 6 316.660 1.051 1 2000 7 315.338 0.382 2 2000 8 315.007 0.456 4 2000 9 314.880 0.980 1 2000 10 nan nan 0 2000 11 315.500 0.494 4 2000 12 316.142 0.557 3 2001 1 nan nan 0 2001 2 316.029 0.458 5 2001 3 315.524 0.717 3 2001 4 317.040 0.592 1 2001 5 315.854 0.573 5 2001 6 316.392 0.759 4 2001 7 316.029 0.780 3 2001 8 314.841 0.459 4 2001 9 315.133 0.394 3 2001 10 315.730 0.713 4 2001 11 315.273 0.294 4 2001 12 316.306 0.285 4 2002 1 316.353 1.283 4 2002 2 317.242 0.564 2 2002 3 316.584 0.312 4 2002 4 316.260 0.699 4 2002 5 315.980 0.601 4 2002 6 316.701 0.525 4 2002 7 316.593 0.406 5 2002 8 316.422 0.481 4 2002 9 316.475 0.530 4 2002 10 316.986 0.459 5 2002 11 317.071 0.431 4 2002 12 316.732 0.448 4 2003 1 316.378 0.583 3 2003 2 317.057 0.454 3 2003 3 317.313 0.268 2 2003 4 317.682 0.382 5 2003 5 317.664 0.286 4 2003 6 317.861 0.482 4 2003 7 317.384 0.200 5 2003 8 317.226 0.331 3 2003 9 317.422 0.363 4 2003 10 317.204 0.362 5 2003 11 318.069 0.237 4 2003 12 317.552 0.478 4 2004 1 316.909 0.404 4 2004 2 317.475 0.517 4 2004 3 317.839 0.502 4 2004 4 317.890 0.582 4 2004 5 317.612 0.572 4 2004 6 317.910 0.398 5 2004 7 317.340 0.456 4 2004 8 317.430 0.497 4 2004 9 317.307 0.473 4 2004 10 318.290 0.694 3 2004 11 318.181 0.520 4 2004 12 318.435 0.472 4 2005 1 318.528 0.457 5 2005 2 318.939 0.659 5 2005 3 318.679 0.832 4 2005 4 319.399 0.408 4 2005 5 318.820 0.773 4 2005 6 319.549 0.387 5 2005 7 319.022 0.752 4 2005 8 318.452 0.622 5 2005 9 318.899 0.707 4 2005 10 318.728 0.474 4 2005 11 319.003 0.733 4 2005 12 319.575 0.450 4 2006 1 319.632 0.532 4 2006 2 319.748 0.331 5 2006 3 319.703 0.605 4 2006 4 320.186 0.616 4 2006 5 320.766 0.664 5 2006 6 319.710 0.615 4 2006 7 320.034 0.681 4 2006 8 319.384 0.603 4 2006 9 319.158 0.790 4 2006 10 319.899 0.416 4 2006 11 320.294 0.444 5 2006 12 319.972 0.509 4 2007 1 320.692 0.844 4 2007 2 320.903 0.708 4 2007 3 320.555 0.555 4 2007 4 320.318 0.474 4 2007 5 320.161 0.376 5 2007 6 320.231 0.569 4 2007 7 320.621 0.413 4 2007 8 320.262 1.051 5 2007 9 320.839 0.642 3 2007 10 320.414 0.673 4 2007 11 320.284 0.363 4 2007 12 320.942 0.480 4 2008 1 320.964 0.511 5 2008 2 321.035 0.675 3 2008 3 321.463 0.571 4 2008 4 321.389 0.555 4 2008 5 321.290 0.486 4 2008 6 321.320 0.679 4 2008 7 320.947 0.459 5 2008 8 321.751 0.507 4 2008 9 321.180 0.459 3 2008 10 321.616 0.466 4 2008 11 322.152 0.562 4 2008 12 322.851 0.470 5 2009 1 322.349 0.756 3 2009 2 322.123 0.602 4 2009 3 322.590 0.691 4 2009 4 322.534 0.703 4 2009 5 322.807 0.486 4 2009 6 322.002 0.523 5 2009 7 322.329 0.510 4 2009 8 321.990 0.574 4 2009 9 321.996 0.632 4 2009 10 322.360 0.446 4 2009 11 323.273 0.760 4 2009 12 322.491 0.518 5 2010 1 322.848 0.521 3 2010 2 323.015 0.864 4 2010 3 322.783 0.385 5 2010 4 322.822 0.381 4 2010 5 322.789 0.454 4 2010 6 323.076 0.630 5 2010 7 322.465 0.427 4 2010 8 322.519 0.697 3 2010 9 323.650 0.422 4 2010 10 322.980 0.526 4 2010 11 323.500 0.480 3 2010 12 323.860 0.436 5 2011 1 323.983 0.693 4 2011 2 324.585 0.903 4 2011 3 324.342 0.539 5 2011 4 324.404 0.463 4 2011 5 324.665 0.564 5 2011 6 324.278 0.450 4 2011 7 nan nan 0 2011 8 324.224 0.664 2 2011 9 324.674 0.564 5 2011 10 324.115 0.495 4 2011 11 324.662 0.634 4 2011 12 324.681 0.434 5 2012 1 325.058 0.420 4 2012 2 325.279 0.574 4 2012 3 325.555 0.292 5 2012 4 325.513 0.437 4 2012 5 325.539 0.320 4 2012 6 325.617 0.538 4 2012 7 324.716 0.402 4 2012 8 324.631 0.445 4 2012 9 325.055 0.324 3 2012 10 324.872 0.431 4 2012 11 325.199 0.327 5 2012 12 325.599 0.507 4 2013 1 325.894 0.582 5 2013 2 326.081 0.432 4 2013 3 325.825 0.469 4 2013 4 326.523 0.712 2 2013 5 326.353 0.499 4 2013 6 326.047 0.462 4 2013 7 326.163 0.728 3 2013 8 325.449 0.635 2 2013 9 326.111 1.230 2 2013 10 326.720 1.043 1 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