[MITgcm-support] Interpolation issue: wet grid-pts with theta=0 identically

[Matthew Mazloff]

Hello

You can see which are wet points as they will have 
hFacC>0 
in the high-res.

Matt


> On Jun 9, 2025, at 10:04 AM, Archie Zhang <zjcxiaobai at gmail.com> wrote:
> 
> Hi matt, 
> 
> Thank you for your response, 
> I am new to MITgcm, could you explain more about how to extrapolate to the wet grid-pts? how can I get the position of the wet grid-pts?
> 
> In my simulation, I only did the extrapolation in horizontal, since I only want to increase the horizontal resolution.
> 
> Thank you !
> 
> On Mon, Jun 9, 2025 at 12:59 PM Matthew Mazloff <mmazloff at ucsd.edu <mailto:mmazloff at ucsd.edu>> wrote:
>> You need to extrapolate the T and S to all wet points. 
>> I usually extrapolate in the vertical first, and then the horizontal. 
>> 
>> You don’t want ICs with T=S=0 in your run.
>> 
>> Matt
>> 
>> 
>>> On Jun 9, 2025, at 9:49 AM, Juncheng Zhang <juncheng.zhang at mail.utoronto.ca <mailto:juncheng.zhang at mail.utoronto.ca>> wrote:
>>> 
>>> Dear all, 
>>>  
>>> I am using MITgcm to run a 1km high-resolution simulation based on the tutorial reentrant channel,
>>> I first run a 5 km simulation, then use the output of 5km run as the initial condition of my 1km run,
>>> However, after I  did the interpolation of 5 km output, and run the model, the error said below:
>>>  
>>> (PID.TID 0000.0001) *** ERROR ***  INI_THETA: found      2891 wet grid-pts with theta=0 identically.
>>> (PID.TID 0000.0001) *** ERROR ***  If this is intentional, you need to set checkIniTemp=.FALSE. in "data", namelist PARM05
>>>  
>>> I know wet grid-pts relates to the parameter hFac? But I don’t know how to fix it,
>>>  
>>> And I tried to ignore this error by adding checkIniTemp=.FALSE., however, the simulation is not stable, and I had weird numerical artifacts appearing.
>>>  
>>> Thank you in advance, I appreciate any help.
>>>  
>>>  
>>> 
>>> Kind Regards
>>> 
>>> Juncheng Zhang
>>> PhD Student, 
>>> 
>>> Earth, Atmospheric, and Planetary Physics
>>> 
>>> Department of Physics
>>> University of Toronto
>>> McLennan Physical Laboratories
>>> 60 St Gorge St
>>> Toronto, Ontario, M5S 1A7
>>> 
>>> juncheng.zhang at mail.utoronto.ca <mailto:juncheng.zhang at mail.utoronto.ca>
>>> 
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>>>  
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