READE -- Describes contents of GFED3_201203
10 December 2012
GEOS-Chem Support Team
geos-chem-support@g.harvard.edu


Overview:
===============================================================================

Prasad Kasibhatla (psk9@duke.edu) wrote:

   Hi all,

   I have updated the GFED3 database to include data for 2011. 
   Please note that GPCP precip data (one of the input datasets needed 
   for GFED3) was not available for all of 2011 - the ERA-Iterim precip 
   (http://climatedataguide.ucar.edu/reanalysis/era-interim) 
   was therefore used for the second half of 2011.

   There were also small isolated changes prior to 2011 in this version 
   of GFED3. I have therefore reprocessed the entire 1997-2011
   GFED3 dataset for GEOS-Chem, now stored in the GEOS_NATIVE/GFED3_201212 
   subdirectory.

   In your GEOS-Chem code, please also modify the following line in 
   GeosCore/gfed3_biomass_mod.F, from:

       CALL GFED3_AVAILABLE( YYYY, 1997, 2010 )

   to
       CALL GFED3_AVAILABLE( YYYY, 1997, 2011 )


   Please note that this is the last update for GFED3.  Plans are underway 
   for GFED4, whcih will ultimately replace the pre-2011 GFED3 dataset and 
   go forward in time post-2011.

   Best,
   Prasad


Bob Yantosca (yantosca@seas.harvard.edu) wrote:

   Please note, we are placing this data into the GEOS_NATIVE/GFED3_201212
   subdirectory so that it will not conflict with the existing data in
   GEOS_NATIVE/GFED3_201203.  By not overwriting the data, we will be able
   to replicate GEOS-Chem results made with prior model versions using
   the data in GFED3_201203.

   We plan to introduce this data in our emissions update of v9-02.
   In the meantime, you are free to use the new GFED3 data in your
   research codes.


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

YYYY/3hourly/GFED3_FR_3HR_YYYYMMDDHH -- 3-hourly fire emission fractions on the
                                        native GFED3 0.5x0.5 grid.

                                        3-hourly factors are available for
                                        2003 thru 2011
                                        

YYYY/Daily/GFED3_FR_DAY_YYYYMMDD     -- Daily fire emission fractions on the
                                        native GFED3 0.5x0.5 grid.

                                        Daily factors are available for
                                        2003 thru 2011

YYYY/Monthly/GFED3_DM_AGW_YYYYMM     -- Files containing GFED3 monthly dry
             GFED3_DM_DEF_YYYYMM        matter (DM) emissions on the native
             GFED3_DM_FOR_YYYYMM        GFED3 0.5x0.5 grid. Units are g/m2.
             GFED3_DM_PET_YYYYMM
             GFED3_DM_SAV_YYYYMM        Monthly emissions are available for
             GFED3_DM_TOT_YYYYMM        1997 thru 2011
             GFED3_DM_WDL_YYYYMM


GFED3_emission_factors.txt           -- Text file containing the GFED3 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), CO2, and CH4.

 
GFED3_humtropmap                     -- GFED3 humid tropical forest map (bpch
                                        format). This is used to assign
                                        emission factors for 'deforestation.'
                                        'Deforestation' occur outside of humid
                                        tropical forest is assigned a
                                        'woodlands' emission factor. Values
                                        are:

                                          1 = humid tropical forest
                                          0 = other


NOTE: GEOS-Chem reads monthly emissions of DM are read from disk,
 multiplies by daily and 3hourly fractions (if necessary), and then
 multiplies by the appropriate emission factors to produce biomass
 burning emissions on the GFED3 0.5x0.5 degree grid  The emissions are 
 then regridded to the current GEOS-Chem or GCAP grid (1x1, 2x25, or 4x5)
 by adapting the MAP_A2A regriddng package


References:
===============================================================================
 (1 ) Original GFED3 database from Guido van der Werf 
        http://www.falw.vu/~gwerf/GFED/GFED3/emissions/
 (2 ) Giglio, L., Randerson, J. T., van der Werf, G. R., Kasibhatla, P. S.,
      Collatz, G. J., Morton, D. C., and DeFries, R. S.: Assessing
      variability and long-term trends in burned area by merging multiple 
      satellite fire products, Biogeosciences, 7, 1171-1186, 
      doi:10.5194/bg-7-1171-2010, 2010.
 (3 ) van der Werf, G.R., J.T. Randerson, L. Giglio, G.J. Collatz,M. Mu, P.S.
      Kasibhatla, D.C. Morton, R.S. DeFries, Y. Jin, and T.T. van Leeuwen,
      Global fire emissions and the contribution of deforestation, savanna,
      forest, agricultural, and peat fires (1997-2009), Atm. Chem. Phys., Vol
      10, 1170711735, 2010.
 (4 ) Mu, M., J.T. Randerson, G.R. van der Werf, L. Giglio, P. Kasibhatla, D.
      Morton, G.J. Collatz, R.S. DeFries, E.J. Hyer, E.M. Prins, D.W.T.
      Griffith, D. Wunch, G.C. Toon, V. Sherlock, and P.O. Wennberg,
      Daily and 3-hourly variability in global fire emissions and consequences
      for atmospheric model predictions of carbon monoxide, Journal of
      Geophysical Research-Atmospheres, 116: D24303, doi:10.1029/2011JD016245,
      2011.