CARBON_APPORTIONMENT - 28 September 2006


 CMAQv4.6 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 10 different source categories or source regions.  A pre-release
 version of this model has been described and evaluated by Bhave et al.
 (2004).

 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
      94,95c94,95
      < #set ModVdiff  = ( module eddy               $Revision; )
      <  set ModVdiff  = ( module acm2               $Revision; )
      ---
      > #set ModVdiff  = ( module eddy_carb          $Revision; )
      >  set ModVdiff  = ( module acm2_carb          $Revision; )
      112,113c112,113
      < #set ModAero   = ( module aero3              $Revision; )
      <  set ModAero   = ( module aero4              $Revision; )
      ---
      > #set ModAero   = ( module aero3_carb         $Revision; )
      >  set ModAero   = ( module aero4_carb         $Revision; )
      116c116
      <  set ModAdepv  = ( module aero_depv2         $Revision; )
      ---
      >  set ModAdepv  = ( module aero_depv2_carb    $Revision; )
      130,134c130,134
      < #set Mechanism = cb4_ae3_aq
      < #set Mechanism = cb4_ae4_aq
      <  set Mechanism = cb05_ae4_aq
      < #set Mechanism = saprc99_ae3_aq
      < #set Mechanism = saprc99_ae4_aq
      ---
      > #set Mechanism = cb4_ae3ca_aq
      > #set Mechanism = cb4_ae4ca_aq
      >  set Mechanism = cb05_ae4ca_aq
      > #set Mechanism = saprc99_ae3ca_aq
      > #set Mechanism = saprc99_ae4ca_aq
      170,171c170,171
      <  set IOAPI  = "${M3LIB}/ioapi_3/${BLD_OS}2_x86pg -lioapi"
      <  set ICL_IOAPI = ${M3LIB}/ioapi_3/ioapi/fixed_src
      ---
      >  set IOAPI  = "${M3LIB}/ioapi_3/${BLD_OS}2_x86pg -lioapi"
      >  set ICL_IOAPI = ${M3LIB}/ioapi_3/ioapi/fixed_src

 NOTE: You must use the I/O API version 3.1beta or newer to support the larger
 number of variables required by the Multipollutant version of CMAQ.

 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
      113,114c113,114
      <  set EMISpath  = $M3DATA/emis/2001
      <  set EMISfile  = emis3d.2001_ah.us36b.20010722.wndw.ncf
      ---
      >  set EMISpath  = $M3DATA/emis/2001carb
      >  set EMISfile  = emis3d.2001_ah.carb.us36b.20010722.wndw.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: POA1, POA2, ... , POA9, PEC1, PEC2,
 ... , and PEC9.  Note that these variables do not replace POA and PEC;
 they are additional variables.

 In the model, POA1 through POA9 represent primary organic aerosol from
 nine distinct source categories (or source regions) that the user wishes
 to track.  POA represents primary organic aerosol from other miscellaneous
 source categories (or source regions).  To yield results that are
 consistent with a standard CMAQ run, the sum of POA1 + POA2 + ... + POA9 +
 POA should be equal to POA in a standard CMAQ emission file.  Similar
 statements apply for PEC1, PEC2, ..., PEC9, 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. (2005).  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 with any combination of CB4
 and SAPRC99 chemical mechanisms, and AERO3 and AERO4 aerosol modules.
 Mechanism files for the combination of CB05 and AERO4 are also available.
 However, only the combination of CB4 & AERO4 and was tested prior to the
 release of CMAQv4.6.


 Reference:

    Bhave, P.V., G.A. Pouliot, and M. Zheng, 2004, Source apportionment of
    primary carbonaceous aerosol using the Community Multiscale Air Quality
    model.  Preprints, 27th NATO/CCMS International Technical Meeting on
    Air Pollution Modeling and its Applications, October 24-29, 2004,
    Banff, Alberta, Canada.  NATO/CCMS, 25-32.