README -- Contents of /pub/geos-chem/data/GEOS_1x1/GFED2_8day_200712/
03 Mar 2010
Bob Yantosca and Claire Carouge
geos-chem-support@g.harvard.edu


Data Download:
===============================================================================

The files in this directory may be accessed by FTP download:

   ftp ftp.as.harvard.edu
   cd pub/geos-chem/data/GEOS_1x1/GFED2_8day_200712/YYYY/MM

where YYYY/MM are the year/month of the data you wish to download.

You may also use "wget" download:

   wget -r -nH "ftp://ftp.as.harvard.edu/pub/geos-chem/data/GFED2_8day_200712/GFED2_200601/"


Files and Directories:
===============================================================================

2001/		           -- Subdirectories containing GFED2 C 8-day 
2002/		              emissions on the GENERIC 1x1 grid in bpch 
2003/	                      format for years 2001 - 2007.
2004/	          
2005/		              Filenames : GFED2_8day_C_YYYYMMDD.generic.1x1  
2006/			      Units     : g/m2
2007/                         
                              The raw data for these files comes to us in
                              text format from the Randerson group at UC
	       		      Irvine.  They were then converted to bpch format
			      with IDL routine "make_c_8day_bpch.pro" by 
                              Bob Yantosca.


GFED2_emission_factors.txt -- Text file containing the GFED2 emission
			      factors for each species as a function
			      of vegetation type.  Includes emission factors
		              for gas-phase species (NOx, CO, ALK4, ACET,
                              MEK, ALD2, PRPE, C3H8, CH2O, C2H6), aerosol
                              species (SO2, NH3, BC, OC), and CO2.

 
GFED2_vegmap.generic.1x1   -- GFED2 vegetation map (bpch format) on the
			      1x1 GENERIC grid.  Values are:

				3 = boreal forest 
				2 = tropical forest; 
				1 = savanna / herb / other land
				0 = water
	 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% As of 12/11/2007, the GFED2_emission_factors_txt file and the           %%%
%%% GFED2_vegmap.generic.1x1 file are the same versions as are found in the %%%
%%% GFED2_200601 directory, which contains monthly emissions.               %%%
%%%                                                                         %%%
%%% At some point we may upgrade to a newer version of the vegetation map   %%%
%%% file from Prasad, but that has not been done as of 12/11/2007.          %%%
%%%                                                                         %%%
%%%   --- Bob Yantosca (yantosca@seas.harvard.edu), 11 Dec 2007             %%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

NOTE: GEOS-Chem reads the GFED2 C emissions data on the generic 1x1 grid,
then converts to equivalent biomass emissions for each species, and then
regrids to the current model grid.  

Therefore, to change GFED2 biomass emissions, all one has to do is to change
the emission factors for the various vegetation types.  


References:
===============================================================================
(1 ) Original GFED2 database from Jim Randerson:
      http://ess1.ess.uci.edu/~jranders/data/GFED2/
(2 ) Giglio, L., G.R. van der Werf, J.T. Randerson, G.J. Collatz, and
      P. Kasibhatla, "Global estimation of burned area using MODIS active
      fire observations", Atm. Chem. Phys. Discuss, Vol 5, 11091, 2005.
      http://www.copernicus.org/EGU/acp/acpd/5/11091/acpd-5-11091.pdf
(3 ) G.R. van der Werf, J.T. Randerson, L. Giglio, G.J. Collatz, 
      P.S. Kasibhatla, and A.F. Arellano, Jr., "Interannual variability
      in global biomass burning emissions from 1997 to 2004", Atm. Chem.
      Phys. Discuss., submitted, 2005, 
      http://sheba.geo.vu.nl/~gwerf/pubs/VanderWerfEA2005ACPD.pdf