[MITgcm-support] eddy transported by mean flow barotropic gyre

[Michael Spall]

My guess is that the eddy is not advected because it is in geostrophic balance 
so v dot grad h =0.  A barotropic flow could advect a baroclinic eddy but for a 
single layer I think you will have this geostrophic degeneracy problem.

Mike

Sent from my iPad

> On Feb 26, 2014, at 11:06 AM, "yang.zhang" <yang.zhang at mun.ca> wrote:
> 
> Here are some pictures, I add the eddy at the 375 day.
> 
> 
>> On Wed, Feb 26, 2014 at 4:49 PM, yang.zhang <yang.zhang at mun.ca> wrote:
>> It is a barotropic case which has only 1 layer 
>> 
>> 
>>> On Wed, Feb 26, 2014 at 4:42 PM, Peng Zhan <peng.zhan at kaust.edu.sa> wrote:
>>> Hi Yang,
>>> I suppose that you added the eddy by adjusting the wind stress would only affect the surface/ near-surface current, for which the EKE is not high enough for propagation. Have you checked how deep is your strong small eddy?
>>> Peng
>>> 
>>> 
>>>> On Wed, Feb 26, 2014 at 9:47 AM, yang.zhang <yang.zhang at mun.ca> wrote:
>>>> Hi, all
>>>> 
>>>> I am using MITgcm barotropic gyre  to generate a background mean flow, then when the flow is stable,  I suddenly add a strong small eddy (with radius smaller than Rossby deformation radius) by adjusting wind stress at some time point,
>>>> 
>>>> I am expecting to see :
>>>> this edyy will be transported by the mean flow and evolves with it.
>>>> 
>>>> However, the eddy is just sitting there and distort the local stream for a while then the flow field restored back to the previous stable state.
>>>> 
>>>> I am using a  closed basin , free-slip boundary condition, with the horizontal diffusion coefficient Ah=0 for the momemtum equation.
>>>> 500m water depth
>>>> 256x256 horizontal grid.
>>>> 
>>>> 
>>>> Any suggestion ?
>>>> 
>>>> Thank you!
>>>> yang
>>>> 
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>>>> 
>>> 
>>> 
>>> 
>>> -- 
>>> Peng ZHAN
>>> 
>>>  
>>> ______________________________
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>>> Email: peng.zhan at kaust.edu.sa
>>>  
>>> 
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>> 
> 
> <54408.png>
> <56808.png>
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