Questions about the Perpetual Mode (perpetual Insolation, SST and Sea ice)

[xiejinbo@mail_iap_ac_cn]

I intend to use cesm1.2.1 to perform a perpetual run with Insolation,sst, and sea ice fixed at the climotological January. I am using the cesm1.2.1, cam4,clm4, docn. This is under the F_2000 compset, and the perpetual run namelist option is set in the user_cam_nml, with perpetual=.true.,perpetual_ymd=00010101. I can see that the model is running, and the results still seem to include a seasonal cycle as the usual annual cycle run. Is this option working in the model, how can I be sure that the model is really working with the perpetual namelist option?

 

[whannah]

I've been interested in this myself, but it seems that option is no longer supported.Check out this previous post: https://bb.cgd.ucar.edu/perpetual-solar-insolation-cam5You can easily set the model to a perpetual equinox by setting the orbital parameters for tilt and eccentricity to zero.

I'd love to have the perpetual option working. I'm going to try looking deeper into this soon.