README -- Describes contents of HEMCO/GFED4/v2023-03 directory 20 Mar 2023 GEOS-Chem Support Team geos-chem-support@g.harvard.edu Overview: =============================================================================== GFED data from 2010-2019 are symbolically linked to the ../2022-11 folder. GFED data for 2020-2022 were provided by Makoto Kelp. The netCDF files have been edited for COARDS compiliance with the following commands for f in GFED4_gen.025x025.*.nc; do ncatted -a long_name,DM_DEFO,o,c,"Dry matter from deforestation" $f done for f in GFED4_gen.025x025.*.nc; do ncatted -a long_name,DM_SAVA,o,c,"Dry matter from savanna" $f done for f in GFED4_3hrfrac_gen.025x025.*.nc; do ncatted units,GFED_FRAC3HR,o,c,"1" $f done -- Bob Yantosca (20 Mar 2023) Emissions were prepared for GEOS-Chem using process_gfed41s_beta.py, which is provided here for reference. Climatology emissions are also provided for 2010-2019 and may be used for years when GFED4 emissions aren't available. Monthly mean emissions for the entire GFED4 record (2007- 2021) are included here for computation so users may compute climatogies for other year ranges using scripts/calc_gfed_climatology.sh. The monthly mean emissions for 2007-2021 were generated from a HEMCO 3.6.1 standalone simulation using 0.5x0.625 MERRA-2 meteorology completed by Melissa Sulprizio. 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 GFED4_climatology_2010-2019_05x0625.nc -- Climatological emissions computed from a HEMCO 3.6.1 standalone simulation for 2007-2021 using 0.5x0.625 MERRA-2 meteorology. See scripts/calc_gfed_climatology.sh. Resolution : GEOS 0.5 x 0.625 grid (576 x 361 boxes) Units : kg/m2/s Timestamps : Monthly, 2019/01 thru 2019/12 Compression : Level 1 (e.g. nccopy -d1) Chunking : nccopy -c lon/576,lat/361,time/1 GFED4_monmean_05x0625_2007-2021.nc -- Global monthly mean GFED4 emissions from a HEMCO 3.6.1 standalone simulation for 2007-2021 using 0.5x0.625 MERRA-2 meteorology. Resolution : GEOS 0.5 x 0.625 grid (576 x 361 boxes) Units : kg/m2/s Timestamps : Monthly, 2007/01 thru 2021/12 Compression : Level 1 (e.g. nccopy -d1) Chunking : nccopy -c lon/576,lat/361,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