Thank you very much for the information Dave, and for cross-posting it in the WACCM forum.I read the link that you posted, however it does not entirely answer my question. In the link that you posted it is mentioned that:8. What compsets is the DOCN-SOM used in?"The E compset with fully active atmosphere, land, and sea ice components uses the DOCN-SOM component as does the active ice only compset (D)."Does that meant that it is not at all possible to combine WACCM and SOM? I read somewhere that it is possible to create you own compset, so theoreticall it should be possible since CESM is a "plug and play" software where you can activate/deactivate different components. I would of course need to run the model until it reached an equilibrium before I could make any changes to it for my research. For my simulation I need to the ocean to reach an equilibrium relatively fast, therefore using an active ocean is not an option. It is a tidally locked Earth stratosphere simulation and I need a slab ocean for the model to be self-consistent.