Creating data streams - CESM2.2

[nuvolet]

Hi everyone,

I was wondering if the process to create new data streams in CESM2.2 is similar to previous version.

• I found this old documentation (https://www.cesm.ucar.edu/models/cesm1.2/cesm/doc/modelnl/nl_datm.html#stream), and I would like to know if I could use it for new cases in the latest version available?.
• Could I customize a data stream to tell CESM2.2 to read some external AOD files and use them in the running case, and create one such us user_datm.streams.txt.AODs.prescribed?. Are this new streams files plus the data_in be incorporated in the $CASEROOT/CaseDocs?
• Additionally from my understanding the time when user can customize those user.streams are before ./case.submit the case, right?

Thanks in advance

 

[altuntas]

Here is the latest relevant CIME documentation:

7. Customizing your input variables — CIME master documentation

esmci.github.io

Note that in the latest versions of CESM2, data models are encapsulated in a new component called CDEPS. Here is the documentation for this new component:

CDEPS documentation — CDEPS master documentation

Could I customize a data stream to tell CESM2.2 to read some external AOD files and use them in the running case, and create one such us user_datm.streams.txt.AODs.prescribed?

I am not familiar with external AOD files and what they may entail, but you might need to define a new data mode in CDEPS source code if special handling of the data to be read is needed. You can look at the available datm_datamode_*.F90 files as examples of how to create a new data mode: CDEPS/datm at master · ESCOMP/CDEPS

Additionally from my understanding the time when user can customize those user.streams are before

Right.