[MITgcm-support] exf interp

[Chris Hill]

Matt,

 Are the surface data sets 1/2 degree res?
 My guess is it is the piecewise constant in the aTemp/aQ/radiation?
If the spline is done right
 the overshoots should be small in a limited area domain, so you could try that.

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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