[MITgcm-support] linear instability

[Samar Khatiwala]

Martin, you will recall our discussion of applying Dirichlet BCs to  
ptracers.
I modified pkg/ptracers, with appropriate hooks in thermodynamics.F and
tracers_correction_step.F to allow this in a fairly general way, but  
the mods
never made it into the CVS repository.

Anyway, I suspect these routines can be readily modified to work on T/ 
S as well.
But its worth trying the restroring hacj before attempting this.

Samar

On Mar 9, 2006, at 2:15 PM, <mlosch at awi-bremerhaven.de> wrote:

> Hi Zoe,
> as far as I know, this (Dirichlet) type of boundary condition for
> temperature is not availble for the top nor the bottom because it
> is not normally used in ocean modeling (it is for open lateral
> boundaries). However, you could hack restoring boundary
> conditions in model/src/external_forcing.F for the bottom (for the
> top they are already coded), so that the temperature is nearly
> your desired values. The alternative is to find all the places in the
> code where the open boundary conditions are applied (call
> obcs_apply_ts and call obcs_apply_t) and apply the Dirichlet
> BCs at the surface and the bottom there.
>
> Martin
>
> Martin Losch
> Alfred Wegener Institute
> Postfach 120161, 27515 Bremerhaven, Germany;
> Tel./Fax: ++49(0471)4831-1872/1797
>
>
>
> ----- Original Message -----
> From: zlr at noc.soton.ac.uk
> Date: Thursday, March 9, 2006 7:24 pm
> Subject: [MITgcm-support] linear instability
>
>> Hello!
>>
>> I have been using MIT as a comparison for a non-hydro. finite
>> element adaptive
>> mesh ocean model.  I am trying to set the top and bottom bcs
> on
>> temp to
>> preserve the initial values eg 0C at the top and 50C at the
> bottom.
>> Any advice
>> would be greatly appreciated.
>>
>> Thanks,
>>
>> Zoe Roberts (PhD student)
>> National Oceanography Centre, Southampton
>> UK
>>
>> --------------------------------------------------------------------
>> ---
>> National Oceanography Centre, Southampton ::
>> http://www.noc.soton.ac.uk
>>
>>
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