CMAQ process analysis vertical diffusion and emission

Hi, all!

I’m trying to calculate mass balance of sulfate concentration from Process Analysis with CONC concentration.

I found that EMIS-ASO4 (emissions contribution to sulfate concentration) was too large.
My emission data of SO4 was approximately 900kg/hr but EMIS_ASO4 from Process Analysis was approximately 9000kg/hr.

And also, I found that emission data have been treated in VDIFF routines and saw the routine below from vdiffproc.F:

C read & interpolate emissions data => VDEMIS_DIFF from EMIS_DEFN module
CALL GET_EMIS ( MDATE, MTIME, TSTEP, CGRID )

  IF ( LIPR ) THEN
     DO S = 1, N_SPC_DIFF
        DO L = 1, EMLAYS
           DO R = 1, NROWS
              DO C = 1, NCOLS
                 EMIS_PA( C,R,L,S ) = VDEMIS_DIFF( S,L,C,R )
              END DO
           END DO
        END DO
     END DO
     CALL PA_UPDATE_EMIS ( 'VDIF', EMIS_PA, JDATE, JTIME, TSTEP )
  END IF

So, I think sulfate emission from emission file is treated as ‘VDIF_ASO4’ in process analysis.
Then, where EMIS_ASO4 values come from ??

And I didn’t add VDIF_ASO4 in my process analysis input file.
Then, should I add VDIF_ASO4 in my process analysis input file and VDIF_ASO4 is essential value in process analysis ??

Please let me know any your responses anytime.

Thank you.

HyeonYeong Park