Ocean Modeling Discussion

well, with a max depth of 320m, the external time step should be below 4s but with a baroclinic phase speed of 3m/s, you should be able to use a tracer timestep of up to 80s. Therefore 25s should be fine. i am at loss. My guess would be to verify your baroclinic phase speed calcultion. I may verify ...

25 s for tracer does seem small. what is your spatial resolution and total depth?

your time step may be limited by strong baroclinic effects (not just the external gravity phase speed). Have you tried to compute the baroclinic phase speed for such a stratified system?

Fred.

Yes, it would be desirable and somewhat more intiutive to be able to use Dirichlet boundary condition for elevation. Tidal applications are one reason. (I think someone mentioned this problem already in this forum). Roms has been written with the idea of using spunge layers to enforce the BCs ...

Has anyone tried a testcase similar to the Chapman paper (JPO, 1985) in a 2D/3D setup? (A wind blowing along a shelf break with radiative BCs on both inflow/outflow; north and south bdy closed) From our experience, for the 2D case, the available BCs don't seem to reproduce the desired result. In the ...

Just in case somebody hasn't replied yet (I hope not!), we did compiled and run ROMS using g77 only on a linux box.

Fred
dupontf@mar.dfo-mpo.gc.ca