These files contain a beta version of the NOAA Earth System Research
Laboratory's North American Boundary Condition for certain gases.

Version date for this release is:  2011-11-14


Before using in a publication or public presentation, please contact:

Arlyn Andrews (Arlyn.Andrews@noaa.gov)
Colm Sweeney (Colm.Sweeney@noaa.gov)
Ken Masarie (Kenneth.Masarie@noaa.gov) 


and for N2O or CH4:  Ed Dlugokency (Ed.Dlugokencky@noaa.gov)
and for CO: Paul Novelli (Paul.C.Novelli@noaa.gov)
and for CO2: Tom Conway (Thomas.J.Conway@noaa.gov)
and for CO2C13: Bruce Vaughn (Bruce.Vaughn@colorado.edu)


Please note that in general, there is more data available for 
the surface layer than aloft.  Thus, the 0 - 1 km altitude bin
may contain values from equator to pole, while values for higher 
altitudes may not be available for all latitudes.  We do not report
values for altitudes above 7 km.  It is up to the user decide how 
to extrapolate these fields to areas where data are unavailable,
though we can provide advice. (Note for v20121113, values are provided
from equator to pole, but values south of 20N and north of 70N are
filled with a constant vale for a given altitude.)

We can provide information that is likely relevant for your analysis 
such as error estimates on the data or the interpolated boundary values.
We can also provide guidance about how to appropriately acknowledge 
the product.  It may be appropriate to include some or all of the above 
investigators as co-authors.  This is a new product, and feedback is welcome. 
This product relies on data from the NOAA ESRL Global Montioring Division's 
Cooperative Air Sampling Network and Aircraft Program.  We plan to 
document this product in an upcoming publication.  

The text output is organized into subdirectories by species.  In each
subdirectory, there are files containing altitude, latitude and date
vectors.  The latitude and date vectors serve as indexes for the 
the [species]_bg_[altitude].txt and [species]_bgrms_[altitude].txt files. 
Each line in those files represesnts an individual date, and each column represents an individual
latitude.  The first value in each line corresponds to the lowest latitude
in the index vector. The "bg" files contain the estimated boundary values.
The "bgrms" values contain root-mean-square errors of the residuals of the
data used to construct the boundary curtains.