[MITgcm-support] filter for cubesphere-grid-corners

[Yuan Lian]

Hi, Andrea,

I tested the cube sphere grid with three new options you suggested:
 useAbsVorticity=.TRUE.,
 SadournyCoriolis=.TRUE.,
 selectKEscheme=3,

The atmospheric model works much better now. There are still corner 
effects (wave number 4 structures) at the beginnning of the simulation 
but they will be gone fairly soon. The corner effects in my simulation 
now perform as initial perturbations which can break zonal symmetry.

Thanks!

Yuan
Yuan Lian wrote:

> Hi, Andrea,
>
> I just compared the tile files. Those that are used in 
> fizhi-cs-aqualev20 are different from what I generated from matlab 
> codes. Could you please tell me how to generate the new grids with 
> location of corners changed? Or could you please generate C64 and C128 
> tile files since I need some high resoultion grids?
>
> Thanks a lot!
>
> Yuan Lian wrote:
>
>> Hi, Andrea,
>>
>> Thanks for the tips. I am still using old tiles which were generated 
>> by the matlab codes. I will try these configurations and report the 
>> results here.
>>
>> Yuan
>>
>> Andrea Molod wrote:
>>
>>> hi yuan,
>>>
>>> this issue at the corners was addressed by jean-michel by changing
>>> the locations of some of the corner grid points and by changing
>>> some options in the numerics. it only showed up as something we 
>>> could see in atmospheric simulations with no stationary waves to 
>>> speak of. his change made the 'corner' issue go away for us.
>>>
>>> i don't know if you have the 'new' tile files or not, but you can
>>> find them for sure in the fizhi aqualev20 verification experiment.
>>> just check to see if they match what you are using, if not, grab
>>> them. also take a look in the 'data' file for this experiment, you
>>> will see:
>>>  useAbsVorticity=.TRUE.,
>>>  SadournyCoriolis=.TRUE.,
>>>  selectKEscheme=3,
>>> hope this makes the need for a 'corner filter' go away....
>>> good luck.
>>> andrea
>>>
>>> ----------------------------------------------------------------
>>> Andrea M. Molod, PhD.
>>> Department of Earth, Atmospheric & Planetary Sciences
>>> MIT
>>> Tel: (617) 253-5458, Email: amolod at mit.edu
>>> WWW:http://paoc.mit.edu/paoc/people/person.asp?position=Postdoc&who=molod 
>>>
>>> ----------------------------------------------------------------
>>>
>>>
>>> On Fri, 22 Sep 2006, Yuan Lian wrote:
>>>
>>>> Hi, Ed
>>>>
>>>> I am trying to add an extra corner filter (like zonal filter as a 
>>>> polar filter) to the eight cubesphere-grid corners. I am thinking 
>>>> to add this filter as a subroutine so its strength is adjustable. 
>>>> The reason why I will do this is because I found the corner effect 
>>>> is very obvious in my atmospheric model. Could you please give me 
>>>> some instructions to do this? Thanks a lot!
>>>>
>>>> Yuan
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>>
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