Inquiry Regarding Appropriate chem_opt Selection for CBMZ–MOSAIC with Aqueous Chemistry

[Setareh Rahimi]

Dear WRF-Chem users,

I hope this message finds you well.

I am currently working with WRF-Chem (v4.6.1) to study the interactions between aerosols and clouds. My intention is to use the CBMZ gas-phase chemistry in combination with the MOSAIC aerosol module.

However, I have noticed that there are several available options for chem_opt that include CBMZ with MOSAIC, some of which also include aqueous-phase chemistry (e.g., options 7, 8, 9, 10, 31–34, etc.). While the User’s Guide notes that these configurations differ in their treatment of aqueous reactions, it is not entirely clear what the specific differences are among these options.

Could you please clarify:

1. What are the key distinctions among the chem_opt options that pair CBMZ with MOSAIC and include aqueous chemistry?

2. Which configuration would be most appropriate for simulating aerosol–cloud interactions, particularly when aqueous-phase processes are of interest?

Any additional documentation or guidance regarding the scientific or numerical differences among these chem_opt settings would be greatly appreciated.

Thank you very much for your time and assistance.

Kind regards,