CMAQ5.2 and PMFINE emission processing


#1

Hello comunity:
I am trying to simulate Black Carbon and PM2.5 using CMAQ5.2 and I obtain the output file ok, but I am wondering if that is ok because, when I read the .log file I saw this:

The following tables list the emission surrogate species
present in each namelist or in the aerosol data table.

GC Namelist: 45 Species
NO2 NO HONO ALD2
ALDX IOLE FORM CO
PAR MEOH OLE ETH
TOL XYLMN NAPH ISOP
TERP SO2 SULF ETOH
ETHA CL2 HCL BENZENE
SESQ SOAALK FORM_PRIMARY ALD2_PRIMARY
BUTADIENE13 ACROLEIN ACROLEIN TOLU
MXYL OXYL PXYL APIN
BPIN HGNRVA HGIIGAS POC
POC POC POC POC
POC

AeroData Table: 22 Species
PSO4 PNO3 PCL PNH4
PNA PMG PK PCA
PEC PFE PAL PSI
PTI PMN PH2O PMOTHR
PMC POC POC POC
POC POC

NR Namelist: 1 Species
NH3

The following GAS emission surrogate species are
not present from any of the Area, Point, Biogenic,
Marine Gas, or Lightning emissions sources
XYLMN NAPH CL2 HCL SESQ
SOAALK FORM_PRIMARY ALD2_PRIMARY BUTADIENE13 ACROLEIN
ACROLEIN TOLU MXYL OXYL PXYL
APIN BPIN HGIIGAS

The following AEROSOL emission surrogate
species are not present from any of the Area, Point,
Biogenic, Marine Gas, or Lightning emissions sources:
PCL PNH4 PNA PMG PK
PCA PFE PAL PSI PTI
PMN PH2O PMOTHR

*WARNING:
One or more emissions surrogates assigned to model species
are not found in emissions sources but the CTM_EMISCHK
environment variable set to False so simulation will proceed.


ATTENTION: The following emission species are available
from the inputs but are not used: 6 Species
CH4 NVOL PMFINE UNK
UNR XYL

I aused CB05 chemical speciation in SMOKE4.5 and CMAQ5.2. I did not agregate species in the chemical definition or *.nml file.

Should CCTM process emission called PMFINE?? What can I do to process PMFINE and get the total speciation for PM2.5??

Thanks for your time


#2

Have you resolved this?


#3

It appears your emissions were created for an older version of CMAQ (like v4.7.1) and specifically one that uses AERO5. Species such as PCL, PNA, PMG, PFE, PMOTHR that are missing from your input are AERO6 species that replace PMFINE. See https://www.airqualitymodeling.org/index.php/CMAQv5.0_PMother_speciation for more information. Note that the warning indicates you are missing species. Your simulation will likely be missing some PM2.5 components in the output. You could try to map your AERO5 emissions to AERO6 species and rerun CMAQ to get more of the PM2.5 mass into the model. Species definition files located within the code repository and specific to each mechanism (https://github.com/USEPA/CMAQ/tree/5.2.1/CCTM/src/MECHS) provide information on how PM2.5 is computed from model output.