MPAS-CMAQ FDDA input file

Hello,

I am a researcher studying air quality in South Korea. I have been exploring the MPAS-CMAQ model and have successfully completed the example simulation following the user guide.

Now, I am attempting to run the model for my specific research period. My goal is to evaluate the MPAS-CMAQ simulation performance for January 2017. I have downloaded all the necessary input data, including emissions, restart files, and FDDA files based on the provided resources.

However, I have a few questions regarding the MPAS-CMAQ process:

Currently, it appears that the provided FDDA files only cover the u, v, T, and q variables.

(1) Generating FDDA files for additional variables:

I would like to perform FDDA for variables other than u, v, T, and q. Could you please guide me on the procedure to achieve this? Would this require using the latest MPAS version (e.g., v8.x) or specific pre-processing tools?

(2) Use of Global Reanalysis Data (FNL/ERA5):

In WRF-CMAQ, it is common to download global reanalysis data (such as FNL or ERA5) to drive the model via nudging. Is a similar workflow required or recommended for running MPAS-CMAQ? I would like to clarify if I need to generate my own nudging fields from global models for my specific period.

Any insights or advice on these points would be greatly appreciated.

Thank you.