When the special keyword “COMBO” is used as a speciation profile code in the Section 8.5.4, “GSREF: Speciation cross-reference file”, all sources matching the cross-reference entry should use a combination speciation profile. The combination speciation profiles
file (GSPRO_COMBO) contains a combination of multiple speciation profiles that combine multiple speciation profiles with a weight for each
profile to support a mixture of fuel profiles to specific counties, when users have information to provide about market penetration
of each fuel and have speciation profiles for each of these fuels available. The format of the GSPRO_COMBO file is shown in Table 8.40, “Format for GSPRO_COMBO”.
Table 8.40. Format for GSPRO_COMBO
| Position | Name | Description |
|---|---|---|
| A | POLID | Pollutant ID (Char 16) (required, should be MODE__POLLUTANT for entries that are mode-pollutant combinations). |
| B | FIPS | FIPS code for country, state and county (Char(5)) (required) |
| C | PERIOD | Period number( e.g., month number)(integer) (required). Need to match SPCMAT_PERIOD settting in script for data that are not period specific, use 1 as default. |
| D | NPROF | Number of profiles in the combination (integer) (required). Values less than or equal to 0 will cause record to be skipped. The maximum number of profiles allowed is 10. |
| E | PROF[1] | First speciation profile code (Char 5 ) (requied). Must match profile code in GSPRO file for pollutant ID.
|
| F | FRAC[1] | Fraction of the first speciation profile code to be used in combination (Real) (required) |
| G | PROF[2] | Second speciation profile code (Char 5 ) (requied). See note on PROF[1]. |
| H | FRAC[2] | Fraction of the second speciation profile code to be used in combination (Real) |
| I,K,etc | PROF[NPROF] | Third through NPROF speciation profile codes (Char 5 ) (requied). See note on PROF[1] |
| J,L,etc | FRAC[NPROF] | Fraction of the third through NPROF speciation profile code to be used in combination (Real) |
An example of a two-entry GSPRO_COMBO file is as follows:
EXH__VOC 001001 1 3 8170 0.50 8171 0.20 8172 0.30
EVP__VOC 001001 1 3 8174 0.50 8175 0.20 8176 0.30
This file would do the following:
For county 01001 in period=1 (e.g., SPCMAT_PERIOD set to 1 ), Exhaust mode VOC would use 3 profiles ( 50% profile 8170, 20% profile 8171, and 30% profile 8172).
For county 01001 in period=1 (e.g., SPCMAT_PERIOD set to 1 ), Evaporative mode VOC would use 3 profiles ( 50% profile 8174, 20% profile 8175, and 30% profile 8176).