Should TRP1 in Emission File Be Changed to TERP for CMAQ Processing?

CMAQ
1

Hello everyone, In my emission input file, the species name for terpenes is written as TRP1.
I would like to know whether CMAQ automatically maps TRP1 to TERP during the model execution according to the chemical mechanism settings, or if I need to manually change TRP1 to TERP in the emission file. i use CMAQ 5.3.2

2

Hello,

Yes, you will need to map TRP1 to TERP in your emission input namelist. Here’s an example for the CB6 mechanism for CMAQv5.3.2: CMAQ/CCTM/src/MECHS/cb6r3_ae6_aq/EmissCtrl_cb6r3_ae6_aq.nml at 5.3.2 · USEPA/CMAQ · GitHub

You would modify the third column in line 136 to read ‘TRP1’ instead of ‘TERP’. A better suggestion is actually to duplicate line 136 so that you have two rules, one which maps TERP to TERP and one which maps TRP1 to TERP. This way you are covered in case any of your emission files have TERP or in case you run BEIS or MEGAN online for biogenic emissions.

Best wishes,
Ben Murphy

3

Thank you.
Then, if the mechanism (mech) specified in my CCTM run script is saprc07tc_ae6_aq, should I modify the corresponding EmissCtrl file located in the CCTM/src/MECHS/ directory?

I will attach both the run script for CCTM and the EmissCtrl_saprc07tc_ae6_aq file (before and after modification) for your reference.

run_cctm mech
run_cctm mech593×170 18.4 KB

before
EMissCtrl_saprc07tc_ae6_aq_before

after
EMissCtrl_saprc07tc_ae6_aq_after

4

Yes, I think that makes sense based on what you have sent.
-Ben

5

Thank you so much for your help.

6

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