README -- Contents of carbon_200411 directory 18 Aug 2005 Bob Yantosca bmy@io.harvard.edu Files: =============================================================================== Data is on the GEOS-CHEM 2 x 2.5 grid. Files are in binary punch format. BCOC_TBond_biofuel.gcap.2x25 -- Emissions of black carbon and organic carbon aerosols from biofuels (baseline year: 2001), according to the Tami Bond et al (2004) inventory. Units are kg C/year. BCOC_TBond_biomass.gcap.2x25 -- Emissions of black carbon and organic carbon aerosols from biomass burning for baseline year 2001, according to the Tami Bond et al (2004) inventory. Units are kg C/year. BCOC_TBond_fossil.gcap.2x25 -- Emissions of black carbon and organic carbon aerosols from fossil fuels (baseline year: (2001), according to the Tami Bond et al (2004) inventory. Units are kg C/year. BCOC_anthsrce.gcap.2x25 -- Monthly mean emissions (baseline year: 1998) of black carbon and elemental carbon from fossil fuels, according to the inventory of Cooke et al (1998), with seasonality imposed by R. Park (2004). Units are kg C/month. BCOC_biofuel.gcap.2x25 -- Monthly mean emissions (baseline year: 1998) of black carbon and elemental carbon from biofuels, according to the inventory of Cooke et al (1998), with seasonality imposed by R. Park (2004). Units are kg C/month. emis_fac.EC-OC.2x25 -- Emission factors that are used to compute the yield of black carbon and organic carbon from the GEOS-CHEM biomass burning inventory. Contact: Rokjin Park (rjp@io.harvard.edu). NVOC.gcap.2x25 -- Emissions of non-volatile organic carbon (kg C/month). This is used for the secondary organic aerosol emissions. NOTES: =============================================================================== (1) Files containing data with units of kg C/year or kg C/month can be regridded with IDL program ~bmy/IDL/regrid/regridh_nh3.pro. (2) emis_fac.EC-OC.2x25 can be regridded with regridh_jv.pro. %%%%%%%%%%%%%%%%%%%%%% ORIGINAL README FOLLOWS HERE %%%%%%%%%%%%%%%%%%%%%%%%% A readme file for precursor emissions of aerosol species compiled by Rokjin J. Park used in GEOS-CHEM. 1) BCOC_TBond_biofuel.geos.1x1 BCOC_TBond_biomass.geos.1x1 BCOC_TBond_fossil.geos.1x1 - Carbonaceous aerosols annual emission from Bond et al. [2004] inventory based on 1996 fuel use data 2) BCOC_anthsrce.geos.1x1 - Carbonaceous aerosols annual emission from Cooke et al. [1999] inventory based on 1984 fuel use data - Impose seasonality on 35 % of total fossil fuel emission (Commercial coal fraction) for OC in the US using Heating degree days which is computed using 2001 daily GMAO temperature data in surface air. The rest are constant with season [Cabada et al., 2002] - Impose seasonality on 8 % of commercial coal fraction for BC in the US using Heating degree days which is computed using 2001 daily GMAO temperature data in surface air. The rest are constant with season [Cabada et al.,2002] - 15 % increase in fossil BC/OC fuel emission in the US relative to Cooke et al. [Park et al., 2003] 3) BCOC_biofuel.geos.1x1 - Woodfuel consumption data from Rose Yevich at Harvard with Fraction of yield of carbon aerosols from Biofuel use over US and Canada. [Cabada et al., 2002] EF_BC_US = 2.E-4 ; BC = 0.2gC/kg wood EF_OC_US = 3.E-3 ; OC = 3.0gC/kg wood Fraction of yield of carbonaceous aerosols from Biofuel use over developing countries other than US and Canada [Street et al., 2001, Dickerson et al., 2002] EF_BC_OT = 1.E-3 ; BC = 1.0gC/kg wood EF_OC_OT = 5.E-3 ; OC = 5.0gC/kg wood [Street, personal communication, 2002] The seasonality is applied only on the residential sector woodfuel use. using heating degree in the United States - 65 % increase in biofuel BC/OC emission in the US relative to Cooke et al. [Park et al., 2003] 4) NH3_anthsrce.geos.1x1 - Annual NH3 emission (TgN/yr) from GEIA inventory for source categories of *1. Domesticated animals (21.6) *2. Fertilizers ( 9.0) 3. Human ( 2.6) 4. Industry ( 0.2) 5. Fossil fuel ( 0.1) * indicates sources with seasonal variation calculated using the method described in Park et al. [2004] ** US emission was adjusted according to Gilliland et al. [2004] (10% decrease) 5) NH3_natusrce.geos.1x1 - Annual NH3 emission (TgN/yr) from GEIA inventory for source categories of *1. Crop ( 3.6) *2. Soil under natural ( 2.4) 3. Wild animal ( 0.1) 4. Ocean ( 8.2) * indicates sources with seasonal variation calculated using the method described in Park et al. [2004] 6) NH3_biofuel.geos.1x1 - Woodfuel consumption data from Rose Yevich at Harvard with Fraction of yield of ammonia from Biofuel use [Andreae and Merlet, 2001] EF_NH3 = 1.3E-3 ; = 1.3NH3g/kg wood Seasonality imposed using the method described in Park et al. [2004] 7) Files: emis_fac.EC-OC.1x1 - Emission factors of OC/BC from biomass burning according to 9 different surface types which can be multiplied to drymass burned internally to compute OC/BC emission 8) aer.bioburn.interannual.geos.1x1.2001 - Biomass burning emission compiled for SO2, NH3, OC, and BC constrained by satellite data for 2001 which is alternative of 7) for OC/BC. ** Currently biomass burning emission for all aerosol species are internally calculated by multiplying emissions factor to drymass burned data. Now they are pre-computed off-line prior to the model simulation which make more consistent total emission regardless of spatial resolution of model.