[MITgcm-support] Input of warm water in depth

Martin Losch Martin.Losch at awi.de
Thu Oct 19 10:48:20 EDT 2017

Hi Hadar,

I think you are on the right track with obcs. If you provide your namelist file(s), it would be easier to help.

It’s not clear to me, what you mean by “higher effect than should be”.
The obcs package in its simplest form just prescribes values for u,v,t,s explicitly. Even if the velocity normal to the boundary is zero, the avection schemes with a stencil larger than 2 or the horizontal diffusion will use the  tracer values and hence diffuse some information from the boundary into the interior. You can test that by using the advection scheme 2 for tracers and by turning of diffusion (diffKhT=0). This will be numerically unstable eventually, but initially you should have no effect of the boundaries.

For any other advice, I am afraid, I would need to have a look at your namelist files.


> On 18. Oct 2017, at 15:16, Hadar Berman <hadarberman at gmail.com> wrote:
> Dear all,
> I am using the MITgcm with specified heat and water fluxes and relaxation for the region of the Gulf of Elat. 
> I would like to check how an input of warmer water entering in different depths from the boundary can effect the surrounding water. 
> I have tried using the obcs pkg, but specifying the temperature in the boundary seems to have a higher effect then should be, and it is not correlated with the discharge (or velocities) entering though the boundary (even when specifying velocities of zero, I still see a great effect due to the temperature of the boundary). 
> As far as I can tell, since I need to check the effect of the water entering in differing depths (and not only on the surface), I can not use the surface forcing via evaporation minus precipitation (EmPmRFile) or the external forcing package (runoffFile). 
> Any ideas?
> Thanks,
> Hadar Berman.
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support

More information about the MITgcm-support mailing list