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

[yang.zhang]

Hi, Mike
I think your guess is right. The eddy is just in a local geostrophic
balance (almost stationary).
For only one layer, do you have any suggestion to make the eddy advected?
Thank you very much!
yang


On Thu, Feb 27, 2014 at 1:22 PM, Michael Spall <mspall at whoi.edu> wrote:

> 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
>>>>
>>>> _______________________________________________
>>>> MITgcm-support mailing list
>>>> MITgcm-support at mitgcm.org
>>>> http://mitgcm.org/mailman/listinfo/mitgcm-support
>>>>
>>>>
>>>
>>>
>>> --
>>>
>>> Peng ZHAN
>>>
>>> ______________________________
>>> PhD Student
>>> Earth Science & Engineering (ErSE)
>>> King Abdullah University of Science and Technology (KAUST)
>>> Bldg 1, Lv 4, 4700 KAUST, Thuwal 23955-6900, Jeddah, Saudi Arabia
>>> Mobile: +966 544701621
>>> Email: *peng.zhan at kaust.edu.sa <peng.zhan at kaust.edu.sa>*
>>>
>>>
>>> ------------------------------
>>> This message and its contents, including attachments are intended solely
>>> for the original recipient. If you are not the intended recipient or have
>>> received this message in error, please notify me immediately and delete
>>> this message from your computer system. Any unauthorized use or
>>> distribution is prohibited. Please consider the environment before printing
>>> this email.
>>> _______________________________________________
>>> MITgcm-support mailing list
>>> MITgcm-support at mitgcm.org
>>> http://mitgcm.org/mailman/listinfo/mitgcm-support
>>>
>>>
>>
> <54408.png>
>
> <56808.png>
>
> _______________________________________________
> 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
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mitgcm.org/pipermail/mitgcm-support/attachments/20140301/18a9f53f/attachment.htm>