GFED2 biomass burning emissions

The GFED2 biomass burning emissions are obsolete and have been superseded by GFED3 (and more recently GFED4). We shall leave this information here for reference.

GFED2 monthly data thru 2008

This code was removed from GEOS-Chem v10-01 and higher versions. The HEMCO emissions component now reads GFED dry matter from netCDF files and computes the resultant biomass burning emissions.

As of July 2009, the GFED2 monthly data is now available for years 1997-2008. The data is available in bpch format from the following directory structure:

ftp ftp.as.harvard.edu
cd pub/geos-chem/data/GEOS_1x1/GFED2_200601/

For more information about the data, please see the following README file: GEOS_1x1/GFED2_200601/README

You will need to make a small modification in routine GFED2_COMPUTE_BIOMASS (in gfed2_biomass_mod.f) in order to update the maximum available year of data. Look for the lines:

     ! Availability of MONTHLY data
     !-------------------------------
     ELSE IF ( LGFED2BB ) THEN
        
        CALL GFED2_AVAILABLE( YYYY, 1997, 2007 )

and change the 2007 to 2008:

     ! Availability of MONTHLY data
     !-------------------------------
     ELSE IF ( LGFED2BB ) THEN
        
        !-----------------------------------------------------------
        ! Prior to 7/8/09:
        ! GFED2 2008 monthly data is now available (bmy, 7/8/09)
        !CALL GFED2_AVAILABLE( YYYY, 1997, 2007 )
        !-----------------------------------------------------------
        CALL GFED2_AVAILABLE( YYYY, 1997, 2008 )

You may also download the updated version of gfed2_biomass_mod.f from:

ftp ftp.as.harvard.edu
cd pub/geos-chem/patches/v8-02-02
get gfed2_biomass_mod.f

--Bob Y. 10:32, 24 February 2010 (EST)

GFED2 8-day emissions

The HEMCO emissions component now reads GFED dry matter from netCDF files and computes the resultant biomass burning emissions.

The GFED2 8-day emissions are now included in the standard model as a user option as of GEOS-Chem v8-02-01. The data files for years 2001-2007 may be downloaded from:

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

For more information on the GFED2 8-day emissions data, please see the README file: GEOS_1x1/GFED2_8day_200712/README

Ray Nassar wrote:

The [GFED2 8-day emissions] code is working and I am using it for my work. Overall, the results I get for CO and ozone are very similar to my monthly GFED runs but this changes if one focuses on a specific region over with a short time scale.

{Here are} ... Some of {my comparisons}. This is by no means a complete analysis but more of an initial assessment.

In my opinion, the move to 8-day emissions is a definite improvement, although as I said, the differences are fairly localized and really only matter for time scales shorter than one month.

--Bob Y. 10:32, 24 February 2010 (EST)