[MITgcm-devel] more seaice

[Jinlun Zhang]

Martin Losch wrote:

> Hi,
>
> I am pretty certain, that the timestep in growth.F must be
> deltaTtracer, because the heat and fresh water fluxes that are computed
> there need to be in sync with the tracer equations.

Martin, you are right.


> I am not so sure
> about the timestep in lsr and advect. Here, and particularily after

>
> Jinlun's message:
> > I would prefer keeping DELTAT for sea ice in case we want asyncronized
> > runs.
> the timestep should probably be deltaTmom. Or, Jinlun, did I
> misunderstand you and everything should be deltaTmom? But then,
> asynchronous time stepping would be impossible. Does it make sense to
> do asynchronous time stepping in the sea ice model, in a similar way it
> is done in the ocean model? At least for the advection it seem to be
> necessary to have small time step=deltaTmom, doesn't it (CFL)?
> In general, I agree, there should be a deltaTice, but maybe there
> should be two: deltaTice=deltaTtracer and deltaTiceAdvect=deltatTmom?

The LSR solver is semi-implicit, so deltaTiceAdvect can be larger than
deltatTmom if you want save some time.
Jinlun