how to create a case with unsurported High resolution

[kaeritai]

Hi dear all,
I am very new to CLM or cesm. Now I want run a case with high resolution ,say 0.05 by 0.05 degree, by CLM5.0.

I have investigated the user guide and many posts on this website(Ask about changing surface data in clm5.0) and found that I should use the command sth like this : /create_newcase --res CLM_USRDAT ......
I notice and guess the option of CLM_USRDAT is used to specify my own resolution; but I do not know how can I make sure that it is at 0.05 by 0.05 degree from the above command? Or how to set this?

I have seen that it is necessnary to make the necessnay surface/damain files (Ask about inputdata download). Thus, after creating the case, I can just use my own forcing data and surface data , which are all at 0.05 by 0.05 degree, instead of the default data? DO I have to do other things to make sure it is running at 0.05 by 0.05 degree (such as env_run.xml)?
since I am running at regional scale, I guess that I should make the surface data first by ./getregional_datasets.pl to obtain my regional surfacedatasets. But I guess the current surface data might be not with the same resolution in my case, right? Does it mean that I should make the surface data by myself (mksurfdata.pl)?

hope I have explianed my questions clearly and thank you in advace.

 

[LiwenWu]

Hi dear all,
I am very new to CLM or cesm. Now I want run a case with high resolution ,say 0.05 by 0.05 degree, by CLM5.0.

I have investigated the user guide and many posts on this website(Ask about changing surface data in clm5.0) and found that I should use the command sth like this : /create_newcase --res CLM_USRDAT ......
I notice and guess the option of CLM_USRDAT is used to specify my own resolution; but I do not know how can I make sure that it is at 0.05 by 0.05 degree from the above command? Or how to set this?

I have seen that it is necessnary to make the necessnay surface/damain files (Ask about inputdata download). Thus, after creating the case, I can just use my own forcing data and surface data , which are all at 0.05 by 0.05 degree, instead of the default data? DO I have to do other things to make sure it is running at 0.05 by 0.05 degree (such as env_run.xml)?
since I am running at regional scale, I guess that I should make the surface data first by ./getregional_datasets.pl to obtain my regional surfacedatasets. But I guess the current surface data might be not with the same resolution in my case, right? Does it mean that I should make the surface data by myself (mksurfdata.pl)?

hope I have explianed my questions clearly and thank you in advace.

Hi kaeritai, I have the same confusion, have you figured it out? How did you set this?

 

[slevis]

The place to start is the documentation here:

1.4. Adding New Resolutions — ctsm release-clm5.0 documentation

 

[Christophe D]

The place to start is the documentation here:

1.4. Adding New Resolutions — ctsm release-clm5.0 documentation

Thank you for your answer.
However this is quite unclear for new users : every component has its own tools for creating and re-mapping data, but I have not found a clear roadmap for changing the grid for a given case, in my case for switching from f09_09_mg17 to f05_05_g17 (FWHIST compset).
The case creation nor setup do not report an error, and I am left with the following error during the build which does not indicate what files are missing :
out=CAM build-namelist - ERROR: No default value found for ncdata

 

[slevis]

I am not a CAM expert, but when you see "no default value found for ..." you may resolve the error by specifying a value for such variable (in this case ncdata) in the namelist (in this case probably user_nl_atm).