CLM3.5-DGVM initial conditions file compabitibility with CCSM3

[ckcastillo@purdue_edu]

Hi! I just want to confirm if the initial conditions files from a CLM3.5-DGVM spin-up run should be compatible as input to a fully-coupled run (compset B) of CCSM3?

The DGVM manual indicates that it is possible to initialize a coupled simulation with an initial or restart file from an offline simulation, but since CLM3.5 is only supported in the offline version, I wondered if this applies.

I was able to run CCSM with DGVM from arbitrary initial conditions in the land component. I tried running CCSM3 with DGVM and an initial conditions files from CLM3.5-DGVM but got a "check_dim / mismatch dimensions" error.

Thanks!

 

[slevis]

Normally a clm.i file from an offline run should work in coupled mode. However, I am not sure whether such files from clm3.5 are backwards compatible with clm3.

The dimensions mismatch error makes me suspect that you're using a different surface dataset (fsurdat in the clm namelist) in the coupled vs. offline runs. If that's true, then I would suggest rerunning the offline run with the surface dataset from the coupled run. Still, I would not wait till the offline run finished to try starting the coupled run, in case a new error arose.

Alternatively you could interpolate the data that's in your clm.i file to make it work in the coupled run. There are a couple of postings about that on this bulletin board in the thread entitled "Errors with input dataset for CLM3.5-DGVM and -CN". In one of these postings I mentioned the interpinic tool which will do what you need, except that I don't think that it will work for DGVM variables. You would need to modify it to work for DGVM variables, and you may find that it's not very straightfwd...

Sam