file:  RITS_global_N2O.txt

Nitrous Oxide (N2O) hemispheric and global monthly means from the NOAA/ESRL 
halocarbons program.  The following data is a combined data set from two or more measurement programs.  
Weighted averages of monthly mean data are combined, interpolated, and smoothed for each sampling location.
Hemispheric and global means are estimated by cosine weighting by latitude.

(PIs) Dr. James W. Elkins, Geoffrey S. Dutton, Dr. Bradley D. Hall

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; Geoff.Dutton@noaa.gov
Phone:      (303) 497-6224            (303) 497-7011         (303) 497-6086
Fax:   (303) 497-6290

This work was funded in part by the Atmospheric Chemistry Project of NOAA's Climate and Global Change Program.

Data use policy:
These data are made freely available to the public and the scientific community in the belief that their wide dissemination
will lead to greater understanding and new scientific insights. The availability of these data does not constitute publication
of the data.  NOAA relies on the ethics and integrity of the user to assure that ESRL receives fair credit for their work.  If the data 
are obtained for potential use in a publication or presentation, ESRL should be informed at the outset of the nature of this work.  
If the ESRL data are essential to the work, or if an important result or conclusion depends on the ESRL data, co-authorship
may be appropriate.  This should be discussed at an early stage in the work.  Manuscripts using the ESRL data should be sent to ESRL
for review before they are submitted for publication so we can insure that the quality and limitations of the data are accurately
represented. The PIs can discuss the quality of the data and any potential problems with its analysis.  Recent data (less
than 1.5 years) are considered preliminary.  Please contact the PIs for more information.

The data should be cited in presentations or publications as the flowing: RITS Nitrous Oxide data from 
the NOAA/ESRL halocarbons program. 

Calibration scale used:  NOAA 2006

More information about the calibration scale can be found at: 
http://www.esrl.noaa.gov/gmd/ccl/index.html

Global monthly data are provided in parts-per-billion, ppb. 

NOAA/GMD Halocarbon Network, 
See (http://www.esrl.noaa.gov/gmd/dv/site/site_table.html#hats_flask) more information on current
halocarbon sampling sites.

alt=Alert, North West Territories, Canada (82.5N, 62.3W) (Atmospheric Environment Service Site); 
brw=Pt. Barrow, Alaska, USA (71.3N, 156.6W) (flask and in insitu); 
lef=Wisconsin, USA, (45.6N, 90.2W) (WLEF Television tower);
nwr=Niwot Ridge, Colorado, USA (40.052N, 105.585W) (University of Colorado site)(flask and in insitu);
kum=Cape Kumukahi, Hawaii, USA (19.5N, 154.8W);
mlo=Mauna Loa, Hawaii, USA (19.5N, 155.6W)(flask and in insitu); 
smo=Cape Matatula, American Samoa (14.3S, 170.6W)(flask and in insitu); 
cgo=Cape Grim, Tasmania, Australia (40.7S, 144.8E) (CSIRO/Australia site); 
psa=Palmer Station, Antarctica (64.6S, 64.0W) -GLASS FLASKS ONLY; 
spo=South Pole (90S)(flask and in insitu);
hfm=Massachusetts, USA (42.5N, 72.2W, 340m) (Harvard University site);
mhd=Mace Head, Ireland (53N, 10W);
thd=Trinidad Head, USA (41N, 124W, 120m);
tdf=Tierra del Fuego, Ushauia, Argentina (54.8S, 68.3W, 10); 
sum=Summit, Greenland (72.6N, 38.4W, 3210m)-GLASS FLASKS ONLY (flask and in insitu);

See (http://www.esrl.noaa.gov/gmd/obop/) for station statistics and personnel.

The last column of data is a five digit binary number that lists the measurement projects used in calculating
the assimilated global mean.  A number 1 indicates data from the corresponding project was uses.
The binary number is arranged from left to right: oldGC, RITS, otto, CATS, MS

oldGC = Original flask program started in 1977 at NOAA baseline observatories, expanded to 7 sites.
RITS = In-situ program started in 1987 at 4 stations (NWR added in 1990).
otto = New flask analysis GC installed in 1995, currently 11 sample sites.
CATS = New in-situ GCs installed from 1998-2000 at 5 stations.  Summit, Greenland added in 2007.
MS = Flasks analyzed via mass spectrometry.

nan = not a number or no data, and space(s) is the delimiter.

The hemispheric and global mean error estimates are calculated using 1-standard deviation errors assigned to
the individual programs plus a systematic errors due to smoothing and interpolating.

RITS_N2O_YYYY RITS_N2O_MM RITS_NH_N2O RITS_NH_N2O_sd RITS_SH_N2O RITS_SH_N2O_sd RITS_Global_N2O RITS_Global_N2O_sd RITS_N2O_Programs
1987   1       nan       nan       nan       nan       nan       nan     01000
1987   2       nan       nan       nan       nan       nan       nan     01000
1987   3       nan       nan       nan       nan       nan       nan     01000
1987   4       nan       nan       nan       nan       nan       nan     01000
1987   5       nan       nan       nan       nan       nan       nan     01000
1987   6       nan       nan       nan       nan       nan       nan     01000
1987   7       nan       nan       nan       nan       nan       nan     01000
1987   8       nan       nan       nan       nan       nan       nan     01000
1987   9       nan       nan       nan       nan       nan       nan     01000
1987  10   306.850     0.395       nan       nan       nan       nan     01000
1987  11   306.919     0.375       nan       nan       nan       nan     01000
1987  12   307.014     0.628       nan       nan       nan       nan     01000
1988   1   307.087     0.754       nan       nan       nan       nan     01000
1988   2   307.077     0.553       nan       nan       nan       nan     01000
1988   3   307.062     0.401       nan       nan       nan       nan     01000
1988   4   307.085     0.363   306.053     0.427   306.569     0.560     01000
1988   5   307.084     0.421   305.954     0.318   306.519     0.528     01000
1988   6   307.068     0.501   305.932     0.334   306.500     0.602     01000
1988   7   307.059     0.367   306.001     0.732   306.530     0.819     01000
1988   8   307.057     0.382   306.111     0.629   306.584     0.736     01000
1988   9   307.123     0.315   306.259     0.491   306.691     0.584     01000
1988  10   307.277     0.251   306.513     0.291   306.895     0.385     01000
1988  11   307.455     0.277   306.807     0.364   307.131     0.458     01000
1988  12   307.620     0.334   307.024     0.249   307.322     0.417     01000
1989   1   307.757     0.325   307.173     0.391   307.465     0.508     01000
1989   2   307.791     0.334   307.266     0.342   307.529     0.479     01000
1989   3   307.649     0.500   307.279     0.237   307.464     0.553     01000
1989   4   307.462     0.819   307.269     0.290   307.366     0.869     01000
1989   5   307.467     0.278   307.284     0.378   307.376     0.469     01000
1989   6   307.660     0.186   307.307     0.284   307.484     0.340     01000
1989   7   307.870     0.240   307.357     0.244   307.614     0.342     01000
1989   8   308.019     0.317   307.464     0.253   307.742     0.406     01000
1989   9   308.148     0.353   307.619     0.248   307.883     0.432     01000
1989  10   308.284     0.342   307.810     0.229   308.047     0.412     01000
1989  11   308.406     0.284   308.010     0.430   308.208     0.515     01000
1989  12   308.514     0.323   308.147     0.491   308.330     0.587     01000
1990   1   308.606     0.326   308.189     0.336   308.398     0.468     01000
1990   2   308.642     0.290   308.201     0.283   308.422     0.405     01000
1990   3   308.638     0.491   308.200     0.385   308.419     0.624     01000
1990   4   309.011     0.369   308.161     0.295   308.586     0.472     01000
1990   5   308.867     0.376   308.137     0.288   308.502     0.474     01000
1990   6   308.720     0.455   308.174     0.268   308.447     0.528     01000
1990   7   308.649     0.578   308.258     0.344   308.453     0.673     01000
1990   8   308.709     0.403   308.369     0.450   308.539     0.604     01000
1990   9   308.840     0.471   308.475     0.804   308.658     0.932     01000
1990  10   308.997     0.364   308.571     1.385   308.784     1.432     01000
1990  11   309.175     0.379   308.699     1.056   308.937     1.122     01000
1990  12   309.343     0.292   308.900     0.507   309.121     0.585     01000
1991   1   309.467     0.279   309.138     0.424   309.302     0.508     01000
1991   2   309.533     0.270   309.254     0.584   309.394     0.643     01000
1991   3   309.548     0.365   309.149     0.803   309.349     0.882     01000
1991   4   309.492     0.405   308.998     1.454   309.245     1.509     01000
1991   5   309.315     0.304   308.985     0.472   309.150     0.562     01000
1991   6   309.089     0.322   309.025     0.371   309.057     0.491     01000
1991   7   308.969     0.284   309.047     0.414   309.008     0.502     01000
1991   8   309.014     0.225   309.136     0.327   309.075     0.397     01000
1991   9   309.191     0.267   309.271     0.409   309.231     0.488     01000
1991  10   309.435     0.346   309.357     0.309   309.396     0.464     01000
1991  11   309.683     0.354   309.393     0.247   309.538     0.432     01000
1991  12   309.901     0.354   309.452     0.301   309.676     0.464     01000
1992   1   310.053     0.415   309.567     0.294   309.810     0.508     01000
1992   2   310.132     0.325   309.658     0.683   309.895     0.756     01000
1992   3   310.147     0.359   309.643     0.237   309.895     0.430     01000
1992   4   310.104     0.301   309.561     0.238   309.833     0.384     01000
1992   5   310.058     0.346   309.487     0.375   309.773     0.510     01000
1992   6   310.046     0.271   309.472     0.287   309.759     0.395     01000
1992   7   310.043     0.291   309.546     0.209   309.794     0.358     01000
1992   8   310.033     0.282   309.655     0.257   309.844     0.382     01000
1992   9   310.050     0.306   309.719     0.186   309.884     0.358     01000
1992  10   310.126     0.233   309.743     0.220   309.934     0.321     01000
1992  11   310.220     0.314   309.807     0.314   310.013     0.444     01000
1992  12   310.292     0.379   309.942     0.389   310.117     0.543     01000
1993   1   310.370     0.380   310.107     0.305   310.238     0.487     01000
1993   2   310.459     0.331   310.253     0.433   310.356     0.545     01000
1993   3   310.512     0.311   310.285     0.441   310.399     0.540     01000
1993   4   310.492     0.323   310.127     0.420   310.309     0.530     01000
1993   5   310.408     0.256   309.917     0.532   310.162     0.591     01000
1993   6   310.314     0.339   309.864     0.276   310.089     0.437     01000
1993   7   310.269     0.326   309.972     0.302   310.121     0.444     01000
1993   8   310.308     0.259   310.101     0.345   310.204     0.432     01000
1993   9   310.449     0.396   310.155     0.321   310.302     0.509     01000
1993  10   310.644     0.406   310.174     0.373   310.409     0.551     01000
1993  11   310.804     0.432   310.230     0.307   310.517     0.530     01000
1993  12   310.910     0.313   310.271     0.452   310.591     0.550     01000
1994   1   310.990     0.308   310.262     0.384   310.626     0.492     01000
1994   2   311.064     0.272   310.287     0.290   310.675     0.398     01000
1994   3   311.151     0.221   310.384     0.279   310.767     0.356     01000
1994   4   311.221     0.314   310.496     0.318   310.858     0.447     01000
1994   5   311.253     0.407   310.600     0.345   310.926     0.534     01000
1994   6   311.283     0.332   310.679     0.335   310.981     0.472     01000
1994   7   311.319     0.455   310.698     0.426   311.008     0.623     01000
1994   8   311.300     0.600   310.733     0.685   311.017     0.911     01000
1994   9   311.222     0.536   310.895     0.287   311.059     0.608     01000
1994  10   311.202     0.542   311.155     0.395   311.178     0.670     01000
1994  11   311.296     0.705   311.451     0.673   311.373     0.975     01000
1994  12   311.410     0.976   311.674     0.985   311.542     1.387     01000
1995   1   311.469     0.602   311.630     0.855   311.550     1.046     01000
1995   2   311.466     0.418   311.327     0.616   311.396     0.745     01000
1995   3   311.408     0.549   310.995     0.600   311.201     0.814     01000
1995   4   311.320     0.754   310.772     0.437   311.046     0.871     01000
1995   5   311.226     0.798   310.620     0.462   310.923     0.922     01000
1995   6   311.133     0.441   310.490     0.319   310.812     0.544     01000
1995   7   311.062     0.379   310.407     0.207   310.735     0.432     01000
1995   8   311.015     0.341   310.415     0.281   310.715     0.441     01000
1995   9   311.041     0.363   310.505     0.282   310.773     0.460     01000
1995  10   311.247     0.481   310.641     0.350   310.944     0.595     01000
1995  11   311.520     0.667   310.867     0.327   311.194     0.743     01000
1995  12   311.619     0.467   311.212     0.433   311.416     0.637     01000
1996   1   311.651     0.677   311.446     0.976   311.548     1.188     01000
1996   2   311.849     0.625   311.356     0.506   311.603     0.804     01000
1996   3   312.118     0.561   311.102     0.379   311.610     0.677     01000
1996   4   312.329     1.231   310.917     0.475   311.623     1.319     01000
1996   5   312.477     1.406   310.865     0.360   311.671     1.452     01000
1996   6   312.446     1.634   310.912     0.326   311.679     1.666     01000
1996   7   312.289     1.811   310.990     0.329   311.639     1.840     01000
1996   8   312.271     1.005   311.071     0.488   311.671     1.117     01000
1996   9   312.411     0.718   311.172     0.474   311.792     0.860     01000
1996  10   312.565     0.474   311.319     0.626   311.942     0.785     01000
1996  11   312.708     0.490   311.497     0.447   312.102     0.663     01000
1996  12   312.856     0.934   311.646     0.364   312.251     1.002     01000
1997   1   312.986     0.776   311.758     0.502   312.372     0.925     01000
1997   2   313.003     0.506   311.852     0.495   312.428     0.708     01000
1997   3   312.855     0.689   311.870     0.448   312.363     0.822     01000
1997   4   312.712     0.838   311.774     0.478   312.243     0.965     01000
1997   5   312.760     0.471   311.657     0.666   312.208     0.816     01000
1997   6   312.939     0.642   311.646     0.708   312.292     0.956     01000
1997   7   313.096     0.361   311.731     0.628   312.413     0.724     01000
1997   8   313.188     0.369   311.828     0.445   312.508     0.578     01000
1997   9   313.270     0.318   311.927     0.426   312.598     0.531     01000
1997  10   313.394     0.508   311.997     0.478   312.695     0.698     01000
1997  11   313.541     0.697   311.981     0.396   312.761     0.802     01000
1997  12   313.696     0.529   311.958     0.560   312.827     0.770     01000
1998   1   313.892     0.480   312.020     0.963   312.956     1.076     01000
1998   2   314.095     0.319   312.119     0.661   313.107     0.733     01000
1998   3   314.185     0.497   312.188     0.527   313.186     0.724     01000
1998   4   314.156     0.533   312.230     0.557   313.193     0.771     01000
1998   5   314.170     0.503   312.258     0.443   313.214     0.671     01000
1998   6   314.305     0.515   312.268     0.495   313.287     0.714     01000
1998   7   314.498     0.376   312.306     0.766   313.402     0.853     01000
1998   8   314.688     0.428   312.438     0.695   313.563     0.816     01000
1998   9   314.876     0.545   312.639     0.395   313.758     0.673     01000
1998  10   315.042     0.674   312.871     0.437   313.957     0.804     01000
1998  11   315.154     0.494   313.169     0.518   314.161     0.716     01000
1998  12   315.215     0.772   313.502     0.727   314.358     1.061     01000
1999   1   315.257     0.659   313.709     0.761   314.483     1.007     01000
1999   2   315.238     0.607   313.691     0.561   314.464     0.827     01000
1999   3   315.286     1.190   313.548     0.659   314.417     1.361     01000
1999   4   315.354     0.970   313.418     0.603   314.386     1.142     01000
1999   5   315.356     0.747   313.383     0.622   314.370     0.972     01000
1999   6   315.231     0.641   313.487     0.586   314.359     0.869     01000
1999   7   315.052     0.622   313.650     0.583   314.351     0.853     01000
1999   8   314.969     0.940   313.784     0.530   314.376     1.079     01000
1999   9   315.020     0.806   313.946     0.541   314.483     0.971     01000
1999  10   315.164     0.512   314.185     0.558   314.675     0.757     01000
1999  11   315.407     0.845   314.437     0.559   314.922     1.013     01000
1999  12   315.711     0.900   314.634     0.512   315.173     1.035     01000
2000   1   315.965     0.722   314.763     0.612   315.364     0.946     01000
2000   2   316.114     0.909   314.818     0.757   315.466     1.183     01000
2000   3   316.201     0.862   314.821     0.861   315.511     1.219     01000
2000   4   316.225     0.468   314.676     0.889   315.451     1.005     01000
2000   5       nan       nan   314.914     1.185       nan       nan     01000