CMAQ simulation at 36km and 12km

Hello all,

I am pretty new to CMAQ. I am doing a CMAQ simulation at 36km grid resolution. I have all input data (emission, ICBC, and MCIP) for this simulation.

However, I have to do another simulation at 12km grid resolution. I am wondering if you could help me how I could run the model for new grid resolution? Also, whether I should use new input data for 12km or can I use the same input data that I used for 36km?
In general, what is the difference between these two simulation? Which items should I change?

Thank you

To run CMAQ for a 12km grid resolution, you would need to have the WRF meteorology defined for the 12km grid, and also the emissions processed using SMOKE for that grid as well.
I would encourage you to take the CMAQ Online Training that is offered by the CMAS Center to learn more.
https://www.cmascenter.org/training/classes/online-cmaq-class.cfm

Hello,

Thank you for your help.

Just two more questions:
1- I have a working MCIP executable which is compatible with my CMAQ. I also have the GRIDDESC which contains the domain information for MCIP run. However, I need more information regarding how I should run MCIP. Can you please help me in this regard?

2- I have IC/BC for 36 km runs. I need to generate 12 km chemical IC/BC from 36 km runs. Can you please give me some ideas regarding how I can generate them?

Thank you in advance.

Hello,

Thank you for your help.

Just two more questions:
1- I have a working MCIP executable which is compatible with my CMAQ. I also have the GRIDDESC which contains the domain information for MCIP run. However, I need more information regarding how I should run MCIP. Can you please help me in this regard?

2- I have IC/BC for 36 km runs. I need to generate 12 km chemical IC/BC from 36 km runs. Can you please give me some ideas regarding how I can generate them?

Thank you in advance.

To run CMAQ, you need emissions and meteorology for the gridded modeling domain, and you need BCs for the perimeter. Earlier you said you have all the inputs for a 36-km simulation. Have you successfully run CMAQ to produce outputs at 36-km resolution?

If you next want to run CMAQ at 12-km resolution, you need meteorology and emissions inputs at 12-km resolution. You need to run WRF to generate meteorology for your 12-km grid, and you need to run SMOKE to generate emissions for the 12-km grid. MCIP will convert 12-km WRF output to a form that can be read by CMAQ, but it cannot generate 12-km meteorology from 36-km meteorology.

Thank you so much for your response.

Yes, I did. I successfully run CMAQ for 36-km grid resolution.

Now, for 12-km, I am working on WRF to generate met data for 12-km. However, for SMOKE, can you please give me more hint?
regarding MCIP, how can I use to to convert 12-km WRF output for CMAQ format?

Regarding IC/BC, can I use the same IC/BC for both 36-km and 12-km grid resolutions?

Thanks a lot

Depending on your specific application, a 12-km emissions dataset may be available for download from an EPA ftp server or from CMAS. Please check the SMOKE documentation and emissions tutorials. If you have specific questions, please post them in a new thread.