README -- Describes contents of HEMCO/GFED4/v2018-11 directory
21 Feb 2020
GEOS-Chem Support Team
geos-chem-support@g.harvard.edu

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

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#####  THIS DATA DIRECTORY CONTAINS THE PRELIMINARY GFED4 DATA.          #####
#####  YOU SHOULD UPDATE TO THE OFICIALLY RELEASED GFED-4 DATA  WHEN     #####
#####  IT BECOMES AVAILABLE                                              #####
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These directories include preliminary 'beta' GFED4.1s biomass burning emissions,
as processed for GEOS-Chem by Maggie Marvin on 2020/02/21. These emissions
replace those available from the GEOS-Chem data download servers in v2018-11,
which contain an error that leads to underestimation of total dry matter
emissions by  >100 Tg per year for 2017 and later.

Emissions were prepared for GEOS-Chem using process_gfed41s_beta.py,
which is provided here for reference.

Source files were downloaded from:
https://www.geo.vu.nl/~gwerf/GFED/GFED4/


Files:
===============================================================================

YYYY/GFED4_gen.025x025.YYYYMM.nc

 -- Monthly emissions of dry matter (i.e. carbon) for years 1997-2014,
    for the following biome types:

    (1) DM_TOTAL : Total dry matter
    (2) DM_TEMP  : Dry matter from temperate forests
    (3) DM_PEAT  : Dry matter from peat
    (4) DM_SAVA  : Dry matter from savanna
    (5) DM_DEFO  : Dry matter from deforestation
    (6) DM_BORF  : Dry matter from boreal forest
    (7) DM_AGRI  : Dry matter from agricultural waste

    For all files:
    Resolution  : GENERIC 0.25 x 0.25 grid (1440 x 720 boxes)
    Units       : kg/m2/s
    Timestamps  : Monthly, 2017/01 thru 2018/05
    Compression : Level 1 (e.g. nccopy -d1)
    Chunking    : nccopy -c lon/1449,lat/720,time/1

YYYY/GFED4_dailyfrac_gen_025x025.YYYYMM.nc

  -- Daily fire emission fractions for years 2003-2014

    For all files:
    Resolution  : GENERIC 0.25 x 0.25 grid (1440 x 720 boxes)
    Units       : unitless
    Timestamps  : Monthly,  2017/01 thru 2018/05
    Compression : Level 1 (e.g. nccopy -d1)
    Chunking    : nccopy -c lon/1449,lat/720,time/1
    

YYYY/GFED4_3hrfrac_gen_025x025.YYYYMM.nc

  -- 3-hourly fire emission fractions for years 2003-2014

    For all files:
    Resolution  : GENERIC 0.25 x 0.25 grid (1440 x 720 boxes)
    Units       : unitless
    Timestamps  : Monthly,  2017/01 thru 2018/05
    Compression : Level 1 (e.g. nccopy -d1)
    Chunking    : nccopy -c lon/1449,lat/720,time/1

References:
===============================================================================

GFED website: http://www.globalfiredata.org 

Akagi, S. K.,  R. J. Yokelson, C. Wiedinmyer, M. J. Alvarado, J. S. Reid, 
  T. Karl, J. D. Crounse, and P. O. Wennberg, "Emission factors for open 
  and domestic biomass burning for use in atmospheric models", 
  __Atmos. Chem. Phys.__, 11, 4039-4072, 2011.
  http://onlinelibrary.wiley.com/doi/10.1002/jgrg.20042/abstract

Andreae, M. O., P. Merlet, "Emission of trace gases and aerosols from biomass 
  burning", __Glob. Biogeochem. Cycles__, Volume 15, Issue 4, pages 955966, 
  December 2001.
  http://onlinelibrary.wiley.com/doi/10.1029/2000GB001382/abstract

Giglio, L., J. T. Randerson, and G. R. van der Werf, "Analysis of daily, 
  monthly, and annual burned area using the fourth-generation global fire 
  emissions database (GFED4)", __J. Geophys. Res, Biogeosciences.__, Vol. 118,
  Issue 1, 317-328, March 2013.
  http://onlinelibrary.wiley.com/doi/10.1002/jgrg.20042/abstract

Randerson, J. T., Y. Chen1, G. R. van der Werf, B. M. Rogers, and D. C. Morton,
  "Global burned area and biomass burning emissions from small fires", 
  __J. Geophys. Res, Biogeosciences__, Volume 117, Issue G4, December 2012.
  http://onlinelibrary.wiley.com/doi/10.1029/2012JG002128/abstract

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)", __Atmos. Chem. Phys.__, 
   Vol. 10, 11707-11735, 2010.
   http://www.atmos-chem-phys.net/10/11707/2010/acp-10-11707-2010.html