How to output integrated reaction rate (IRR) for ANO3 and ANH4

CMAQ
1

Hello. I want to output the integrated raction rate (IRR) for seconday formed ANO3 and ANH4. For example, reaction NH3+HNO3 <-> NH4NO3. However, I can not find the reaction label in the mech_cb6r3_ae7_aq.def file. How could I get the reaction labels of the chemical reactions for ANO3 and ANH4?

2

IRR is for gas-phase chemistry only. You need to use Integrated Process Rate (IPR) analysis instead. Ammonium nitrate condensation is an aerosol process, so your process analysis control file should include something like this:

DEFINE FAMILY ANO3 = ANO3I + ANO3J;
DEFINE FAMILY ANH4 = ANH4I + ANH4J;
IPR_OUTPUT ANO3 = AERO;
IPR_OUTPUT ANH4 = AERO;

If you want to look at aerosol subprocesses, then substitute COND + COAG + NPF + GROW for AERO. You could also include other physical processes if you want to examine the effect of each; see Table 9-2 in the User Guide.

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3

Thank you for your answer.