[MITgcm-support] sponge layer

[David Wang]

Hello...

I'm going to implement "sponge layers" near artificial domain boundaries 
within which model temperature may be restored to some temperature 
climatology (say Levitus94) at different relaxation timescales. I've 
already checked out the sponge layer option in the obcs pkg, where the 
relaxation temperature is the linear combination of model temperature 
and the prescribed temperature at the boundary. This is not really what 
I want. If I need to write some extra code to achieve my purpose (which 
is not uncommon), could anyone provide any guidelines... or did I miss 
anything?

btw, I did notice the 3-dim relaxation code emerged in the latest 
checkpoint, but its relaxation timescale is set to be spatically constant...

Thanks, David