[MITgcm-support] Re: single layer run

[Martin Losch]

Hi,

I guess I have to give in (o:
If there were only no dissipation ...

Martin

On May 13, 2005, at 4:45 PM, Jason Goodman wrote:

> On May 13, 2005, at 10:15 AM, Dimitris Menemenlis wrote:
>
>> Martin wrote:
>>
>>> I am convinced that even in the case of constant (in time) pressure
>>> forcing you should end up with a steady state that is non-zero, also
>>> in the case of a single layer.
>>>
>>
>> Martin and Sergey, I have been following your discussion with some 
>> interest.  I don't understand why a constant in time surface pressure 
>> forcing would establish a non-zero circulation at steady state.  
>> Isn't the inverse barometer adjustment meant to insure that there is 
>> no such circulation, i.e., that (for a flat ocean) the pressure at 
>> the bottom of be constant?
>
> I'd say so.  Martin's equation
>
> f*v + g*d(ssh)/dx + (1/rho0)*dp/dx = 0
>
> leaves out the bottom drag term.  While it is true that a transient 
> circulation parallel to atmospheric pressure contours should occur at 
> first, the inclusion of a bottom-drag term means the flow will have a 
> small down-pressure-gradient component.  Thus, water will pile up in 
> the low-atmospheric-pressure zones, until the second two terms in 
> Martin's equation balance and the flow goes to zero.  This is a stable 
> solution.
>
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