Spin-up time for standalone CAM (F compset)

[liptak@umich_edu]

How long does it take the atmosphere to spin up in the standalone CAM4 (i.e., CAM build with prescribed monthly seasonal sea ice and SSTs in F component set) initialized with default climatological conditions?  I recall a reply to a similar query of a couple weeks, but am not sure if this pertains to the standalone CAM.  

 

[hannay]

The atmosphere spins up very quickly in the order of weeks. 

 

[liptak@umich_edu]

Thanks for the speedy reply!  Do you know of a reference for standalone CAM spin-up time (there are several for coupled configurations), or is it simply "common knowledge" among CESM users?  

 

[brianpm]

This paper might be a starting point, at least:Simmonds, I. (1985), Analysis of the “Spinup” of a general circulation model, J. Geophys. Res.,90(D3), 5637–5660, doi:10.1029/JD090iD03p05637.It isn't for CAM, but covers some of the basic issues associated with starting an atmospheric model from stationary, isothermal conditions (which is rarely how CAM gets started).