CARBON_APPORTIONMENT - 6 January 2010 CMAQv4.7.1 includes an optional diagnostic model configuration that provides detailed information on the source origin of primary carbonaceous aerosol. This model version, referred to as the CMAQ Carbon Apportionment Model, tracks the contributions of elemental carbon and primary organic carbon from 15 different source categories or source regions. A pre-release version of this model has been described and evaluated by Bhave et al. (2007). In order to build the carbon apportionment version of the CTM executable program, several different modules, a different chemical mechanism, and a different IOAPI library must be specified in the model build script. You can modify the bldit.cctm.linux script as follows and build the carbon apportionment version of the CCTM: 43c43 < set APPL = e3a --- > set APPL = ce3a 96c96 < set ModVdiff = ( module acm2_inline $Revision; ) --- > set ModVdiff = ( module acm2_inline_carb $Revision; ) 112c112 < set ModAero = ( module aero5 $Revision; ) --- > set ModAero = ( module aero5_carb $Revision; ) 115c115 < set ModAdepv = ( module aero_depv2 $Revision; ) --- > set ModAdepv = ( module aero_depv2_carb $Revision; ) 130c130 < set Mechanism = cb05cl_ae5_aq --- > set Mechanism = cb05cl_ae5ca_aq 132c132 < #set Mechanism = saprc99_ae5_aq --- > #set Mechanism = saprc99_ae5ca_aq Next, modify the run script as follows: 7c7 < # Usage: run.cctm >&! cctm_e3a.log & # --- > # Usage: run.cctm >&! cctm_ce3a.log & # 22,23c22,23 < set APPL = e3a < set CFG = e3a --- > set APPL = ce3a > set CFG = ce3a 119,120c119,120 < set EMISpath = $M3DATA/emis/2001 < set EMISfile = emis3d.20010722.US36_40X44.ncf --- > set EMISpath = $M3DATA/emis/2001/carb > set EMISfile = emis3d.20010722.US36_40X44.carb.ncf Note: You can change the default scripts by using the Unix "patch" utility. Cut the indented section listed above into a file, say "mod." Then type, for example, "patch run.cctm mod." The carbon apportionment model will work with the same IC and BC files available for use with the standard CMAQ model. However, special processing is required to generate the emission input files. In addition to the standard list of emitted species, the model-ready emission files must contain the following variables: POC01, POC02, ... , POC15, PEC01, PEC02, ... , and PEC15. Note that these variables do not replace POC and PEC; they are additional variables. In the model, POC01 through POC15 represent primary organic carbon from fifteen distinct source categories (or source regions) that the user wishes to track. POC represents primary organic carbon from other miscellaneous source categories (or source regions). To yield results that are consistent with a standard CMAQ run, the sum of POC01 + POC02 + ... + POC15 + POC should be equal to POC in a standard CMAQ emission file. Similar statements apply for PEC01, PEC02, ..., PEC15, and PEC, which represent elemental carbon emissions. To track primary carbonaceous aerosol concentrations from different source categories, users may modify the GSPRO and GSREF files and rerun SMOKE in a manner similar to that described by Bhave et al. (2007). To track primary carbonaceous aerosol concentrations from different source regions, users must create their own emission processing procedure. In the run script created above, replace the EMISpath and EMISfile definitions to point to the newly-generated emission file. The carbon apportionment model may be operated in any combination of CB05 and SAPRC99 chemical mechanisms with the AERO5 aerosol module. Reference: Bhave, P.V., G.A. Pouliot, and M. Zheng, 2007, Diagnostic model evaluation for carbonaceous PM2.5 using organic markers measured in the southeastern U.S. Environ. Sci. Technol., 41:1577-1583.