[MITgcm-support] exf interp

[Matthew Mazloff]

Hi Chris,

> Are the surface data sets 1/2 degree res?

1 degree res -- starting at the half degree:
uwind_lon0         = 229.5D0,
uwind_lon_inc      = 1.D0,
uwind_lat0         = 26.5D0,
uwind_lat_inc      = 15*1.D0,

> My guess is it is the piecewise constant in the aTemp/aQ/radiation?

I'm confused, I'm plotting windstress curl, and the wind speed uses  
bicubic interpolation already.
Do you think this is a feedback from buoyancy forcing be linearly  
interploated?  I can check the wind speed to ensure the signal is not  
coming from the (ocean) relative speed in the stress calculation.

> If the spline is done right
> the overshoots should be small in a limited area domain, so you  
> could try that.

You mean trying bicubic for buoyancy components?


Thanks for the help!
-Matt



>
> Chris
>
> On Sat, Oct 17, 2009 at 11:38 AM, Matthew Mazloff <mmazloff at mit.edu>  
> wrote:
>> Hi Dimitris,
>>
>> See the lines at X.5 degrees.  Its not very noticeable in  
>> snapshots, but
>> really stands out in the mean as the signal is accumulated
>>
>> -Matt
>>
>>
>>
>>
>>
>>
>> On Oct 17, 2009, at 7:42 AM, Dimitris Menemenlis wrote:
>>
>>> Matt, could you send an example figure of problem?
>>>
>>> On Oct 17, 2009, at 7:29 AM, Matthew Mazloff wrote:
>>>
>>>> Hi Dimitris,
>>>>
>>>> Ah yes, I see this now.  Very nice.  Unfortunately the gridding is
>>>> still noticeable in my plots of wind speed gradient.  I am able to
>>>> pick out the exact locals where the forcing is prescribed --  
>>>> meaning
>>>> the interpolation is not smooth.  This is not good for plotting  
>>>> wind-
>>>> stress curl. Have you noticed this on your high-res set-ups?  Do  
>>>> you
>>>> think this is a problem?  Should we (can we) try a smoother interp
>>>> method?
>>>>
>>>> -Matt
>>>>
>>>> On Oct 16, 2009, at 5:03 PM, Dimitris Menemenlis wrote:
>>>>
>>>>> Matt, I hardcoded bilinear interpolation for tracer fields because
>>>>> overshoots can be problematic and bicubic for wind velocity (see
>>>>> exf_set_uv.F) for stress fields because the second derivative
>>>>> matters.  I would recommend to leave as is.  Other combinations  
>>>>> can
>>>>> (or did) cause trouble.  Dimitris
>>>>>
>>>>> On Oct 16, 2009, at 3:21 PM, Matthew Mazloff wrote:
>>>>>
>>>>>> Hello,
>>>>>>
>>>>>> It appears the model is equipped to do both bilinear and bicubic
>>>>>> interpolation for exf_interp.F.  Interp_method, however, is  
>>>>>> hardcoded
>>>>>> to bilinear interpolation.  This does matter for my 1/16 degree  
>>>>>> set-
>>>>>> up.  Can anyone confirm that the bicubic interpolation is ok --  
>>>>>> and I
>>>>>> can go ahead and use this option.
>>>>>>
>>>>>> -Thanks,
>>>>>> Matt
>>>
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