README -- Contents of EPA_NEI_200708 directory 19 Dec 2007 Philippe Le Sager and Bob Yantosca pleasager@seas.harvard.edu yantosca@seas.harvard.edu ******************************************************************************* * NOTE: The files in this directory were regridded to the 4x5 GCAP grid from * * higher-resolution data. Also be sure to see the 1x1 data files located in: * * /san/as04/data/geos/GEOS_1x1/EPA_NEI_200708. * ******************************************************************************* NOTES: ------ (1) The files in the EPA_NEI_200708 directory were updated to account for for transport emissions in California. The files in EPA_NEI_200411 did not contain these emissions. (2) The files in the EPA_NEI_200708 directory contain NH3 emissions, whereas the files in the EPA_NEI_200411 directory did not. (3) Files may be stored gzipped, which adds the *.gz suffix. THESE FILES ARE FOR THE 4x5 GCAP GRID! Files: =============================================================================== usa_mask.gcap.4x5 -- 4 x 5 GCAP mask file which is used for emissions over the continental USA. Grid boxes that lie totally within the USA are assigned value of 1, other boxes are assigned a value of zero. wkday_avg_an.199901.gcap.4x5 -- EPA/NEI99 weekday anthropogenic emissions wkday_avg_an.199902.gcap.4x5 files on the 1 x 1 GEOS grid for the wkday_avg_an.199903.gcap.4x5 following species: wkday_avg_an.199904.gcap.4x5 wkday_avg_an.199905.gcap.4x5 NOx, CO, ALK4, ACET, MEK, PRPE, wkday_avg_an.199906.gcap.4x5 C2H6, C3H8, CH2O, SO2, SO4, NH3 wkday_avg_an.199907.gcap.4x5 wkday_avg_an.199908.gcap.4x5 wkday_avg_an.199909.gcap.4x5 wkday_avg_an.199910.gcap.4x5 wkday_avg_an.199911.gcap.4x5 wkday_avg_an.199912.gcap.4x5 wkend_avg_an.199901.gcap.4x5 -- EPA/NEI99 weekend anthropogenic emissions wkend_avg_an.199902.gcap.4x5 files on the 4 x 5 GCAP grid for the wkend_avg_an.199903.gcap.4x5 following species: wkend_avg_an.199904.gcap.4x5 wkend_avg_an.199905.gcap.4x5 NOx, CO, ALK4, ACET, MEK, PRPE, wkend_avg_an.199906.gcap.4x5 C2H6, C3H8, CH2O, SO2, SO4, NH3 wkend_avg_an.199907.gcap.4x5 wkend_avg_an.199908.gcap.4x5 wkend_avg_an.199909.gcap.4x5 wkend_avg_an.199910.gcap.4x5 wkend_avg_an.199911.gcap.4x5 wkend_avg_an.199912.gcap.4x5 %%%%%%%%%%%%% MODIFICATION TO EPA-NEI99 emissions %%%%%%%%%%%%%%%%%%%%%%%%%%%%% 10 Aug 2007 Philippe Le Sager phs@io.as.harvard.edu Filenames are the same as the previous NEI99 anthropogenic emissions files. The new emissions have been updated to account for transport emissions in California, which were missing from the 1999 EPA inventory. The monthly_average_2001_ai_mb.us36b.***.ncf files are anthropogenic emissions due to transport from 2001 inventory. They are 1x1 data set over USA. Details are in the netCDF attributes. wk***_avg_an.1999**.geos.1x1 are the original anthropogenic emissions files used in GEOS-Chem (see original README hereafter). Procedure to update the emissions includes: ------------------------------------------- (1) A mask was created to keep only the California transport emissions from the 2001 inventory. (2) The speciation of PARaffin, a 2001 category that is separated into C2H6, C3H8, ALK4+, and ACET in the 1999 inventory has been estimated from the original NEI99 inventory for consistency. (3) Data have been regridded to conform with GEOS-Chem 1x1 grid. (4) Units conversion (2001 inventory is in moles/s/box). (5) Once masked and separated into their corresponding 1999 species, the 2001 mobile emissions are added to the orignal NEI99 data. (5) Further regridding is done to get 4x5 and 2x2.5 data. (6) Finally, emissions are cut to get 1x1 North American grid data. IDL routines to process 2001 emissions and add them to the original files can be found in ~phs/IDL/dvpt/EPA. Results ------- The following emissions in California are increased: NOx, CO, ALK4, PRPE, C3H8, C2H6, SO2, SO4, and NH3 %%%%%%%%%%%%%%%%%%%%% ORIGINAL README FOLLOWS BELOW %%%%%%%%%%%%%%%%%%%%%%%%%% NEI99 Emission Inventory README (rch 11/1/04) 1) These files were created from NEI99 regridded emissions originally at .25X.25 resolution. These files can be found /data/epa_data Please see README file in this directory for original file info. The following emission types are included in the NEI99 inventory. Anthropogenic ------------- cow/ household_solvents/ power/ aircraft/ fertilizer/ industrial/ fowl/ industrial_solvents/ residential_fossil/ hogs/ other/ transport/ Biofuel ------- residential_biomass/ Not updated but available in inventory -------------------------------------- biogenic/ biomass/ Procedures Document for Emission Inventory can be found in the group library 2) The files are large and as such were preprocessed into hourly files using extract_epa.pro of the format: e.g., temp_cow_average.1999jul.wkend_avg.24.gz These files can be found at /data/epa_data/EPA_TEMP/ 3) These files were then summed over a day, summed over each source type and converted into molec/cm2/s --> to get anthropogenic and biofuel emissions for each month and regridded to 1X1 using read_regrid_epa.pro 4) These files were then scaled. All emissions were kept as is except for the following anthropogenice emissions (not biofuel): ;Propane(19), Ethane(21), and Acetone(9) are scaled by X6.4, X2.5, and X3 ;respectively to match prior emissions if tracerin(i) eq 19 then scalefactor = 6.4d0 if tracerin(i) eq 21 then scalefactor = 2.5d0 if tracerin(i) eq 9 then scalefactor = 3.0d0 It is well-known that this inventory likely underestimates many VOCs. This scaling was done using scale_to_geos_anthro.pro and scale_to_geos_bf_new.pro 5) These emissions were then regridded using regrid_biofuel.pro and regrid_anthro.pro to create the files in 2X25 and 4X5 6) A mask over the U.S.(1=in U.S. and 0=not in U.S.) is used to implement these emissions since we do not have original global emission files. NEI99 is used in boxes exclusively U.S., those boxes which have Canadian and Mexican emissions are left as previous 1998 emissions. 7) NEI99 includes both weekend and weekday emissions and those are implemented here. Diurnal scaling is done as before in GEOS-CHEM.