What's the CISM2-EVOLVE status in CESM 3.0 beta?

[mike_scchen@gmail_com]

Hi,
We're trying to port CESM 3.0 beta versions to our own machine, but I guess this question is not about porting.

CISM is a data model (static) as default, and can be coupled with CLM by using CISM2%XXX-EVOLVE in compset, or by setting XML value CISM_EVOLVE_ICESHEET and CISM_EVOLVE.
(CISM in CESM master document)

But checking the cesm/cime_config/config_compsets.xml in beta05 and beta06 shows that none of the included (short) compset uses CISM; all of them uses DGLC.
Looks like the default CISM2%NOEVOLVE will be replaced by DGLC:
Use data glc model where we used to use CISM2%NOEVOLVE · Issue #1136 · ESCOMP/CTSM

So, what's the CISM2-EVOLVE status in current CESM3 betas, and in future CESM 3 releases?
Thanks!

Mike

 

[gunterl]

Hi Mike,

You can run with an evolving ice sheet in CESM3. We added logic to run with either Greenland and/or Antarctica. (Note that we have not validated evolving Antarctica at this point).
We have created a grid alias name that will include the CISM Greenland but it will be in one of our next CESM tag. In the meantime, you can always use a long name to define the grid and the compset you'd like to use (see documentation here: Create New Case — CESM Tutorial)

For Greenland, the grid reference is gris4.
For the compset you can use a long name such as: 1850C_CAM70%LT_CLM60%BGC-CROP_CICE_MOM6_MOSART_CISM2%GRIS-EVOLVE_WW3
(note that instead of CISM2%EVOLVE, in CESM3 you have to specify which ice sheet you'd like to evolve).

Thanks

Gunter