[MITgcm-support] momentum dissipation at the surface

[Martin Losch]

Hi Georgy

Resetting surface velocity, say in correction_step.F would probably do it, but I wouldn't do that, because of breaking consistency between flow field and hydrography.

There is the pkg/rbcs that let's you restore tracers and velocity, see here <http://mitgcm.org/public/r2_manual/latest/online_documents/node237.html> for documentation, that does not include the velocity part, but I think you can use RBCS_PARAMS.h to figure out the corresponding parameters.

Martin
PS. sorry for mistyping your name in the last email

On Jan 22, 2012, at 11:37 PM, Georgy Manucharyan wrote:

> Thanks for the advice, Martin.
> I have a follow up question. The fix with increased vertical viscosity would work for me if I would be able to set-up velocity in the top layer to be zero. Do you know in which file should I set it to zero? Alternatively, is there a way if prescribing a restoring term for the surface velocity in order to dissipate it with a certain time scale?
> Thanks in advance for your help,
> Georgy
> 
> mitgcm-support-request at mitgcm.org wrote:
>> Message: 3
>> Date: Thu, 19 Jan 2012 09:31:32 +0100
>> From: Martin Losch <Martin.Losch at awi.de>
>> To: mitgcm-support at mitgcm.org
>> Subject: Re: [MITgcm-support] momentum dissipation at the surface
>> Message-ID: <FF388ED1-4466-4F88-8D80-29D08094710C at awi.de>
>> Content-Type: text/plain; CHARSET=US-ASCII
>> 
>> Gregory,
>> there is a parameter (array) viscArNr(1:Nr) (and diffKrNrT/S) to be specified in data &PARM01 for vertical viscosity.
>> 
>> I do not know of a way of prescribing horizontal viscosity as a function of depth (k-index).
>> As a hack I suggest including some scaling factor in pkg/mom_common/mom_calc_visc.F
>> 
>> Martin
>> 
>> On Jan 18, 2012, at 11:40 PM, Georgy Manucharyan wrote:
>> 
>>  
>>> Hello,
>>> Is there a way of prescribing increased momentum dissipation of at the surface of the ocean? In other words, could I increase the horizontal and vertical viscosity in upper few layers of the ocean?
>>> Thank you for your help,
>>> Georgy
>>> 
>>> _______________________________________________
>>> MITgcm-support mailing list
>>> MITgcm-support at mitgcm.org
>>> http://mitgcm.org/mailman/listinfo/mitgcm-support
>>>    
>> 
>> 
>> 
>> 
>> ------------------------------
>> 
>> _______________________________________________
>> MITgcm-support mailing list
>> MITgcm-support at mitgcm.org
>> http://mitgcm.org/mailman/listinfo/mitgcm-support
>> 
>> 
>> End of MITgcm-support Digest, Vol 103, Issue 13
>> ***********************************************
>> 
>>  
> 
> 
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mitgcm.org/mailman/listinfo/mitgcm-support