question on model spin-up

[Arup]

Hello experts!
I have a question regarding best practice for CLM5 spin-up when changing atmospheric forcing datasets.

My analysis focuses primarily on carbon fluxes. I have successfully completed a full spin-up using GSWP3 atmospheric data. Following the model spin-up, I conducted a transient simulation. Now, I would like to conduct a similar transient simulation while maintaining the same surface file and compset, but using a different atmospheric forcing source, such as CRU.
Is it necessary to conduct a new complete spin-up using the updated atmospheric data? Or is it acceptable to initialize the CRU transient simulation from the previous equilibrium state achieved with GSWP3 data?

Thanks

 

[oleson]

Generally, if the forcing datasets are signficantly different from one another, then separate spinups would likely be recommended.