[MITgcm-support] ECCO regrid interpolation

[Martin Losch]

Hi again,

yes, ECCO2 uses a curvilinear grid, but the cell-to-cell variations are very small.

In general, the internal MITgcm averaging and differencing works in the same way (i.e. the gradient of eta at a U-point is actually something like (etaN(i,j)-etaN(i-1,j))*recip_dxC), so I think you are safe doing it like that.

Martin


> On 15. Jan 2020, at 08:28, ESTANISLAO GAVILAN PASCUAL-AHU <e.gavilan at hhu.edu.cn> wrote:
> 
> 
> Hi Martin,
> 
> That what I thought at the beginning. However, the grid since of ECCO2 changes, so I was reluctant to follow that approach.
> 
> Kind regards,
> 
> Estanislao
> 
>> 
>> Dear community,
>> 
>> 
>> I was trying to regridded the sea surface elevation data to the u and v points in order to compute the normal transport across each cell. At the beginning I thought I could use griddata from MATLAB or python. However, since my grid is curvilinear I think I cannot do such thing. Does MITgcm have any kind of tool for regridding this type of data? Thanks in advance for your help
>> 
>> 
>> Kind regards,
>> 
>> 
>> Estanislao
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>> Message: 2
>> Date: Tue, 14 Jan 2020 11:23:12 +0100
>> From: Martin Losch <Martin.Losch at awi.de>
>> To: MITgcm Support <mitgcm-support at mitgcm.org>
>> Subject: Re: [MITgcm-support] ECCO regrid interpolation
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>> 
>> Hi Estanislao,
>> 
>> wouldn?t the natural C-grid way of computing EtaN at U points be 
>> EtaNatU(i,j) = 0.5*(EtaN(i-1,j)+EtaN(i,j))
>> and similarly at V points
>> EtaNatV(i,j) = 0.5*(EtaN(i,j-1)+EtaN(i,j))
>> ?
>> 
>> Martin
>> 
>>> On 14. Jan 2020, at 02:53, ESTANISLAO GAVILAN PASCUAL-AHU <e.gavilan at hhu.edu.cn> wrote:
>>> 
>>> Dear community,
>>> 
>>> I was trying to regridded the sea surface elevation data to the u and v points in order to compute the normal transport across each cell. At the beginning I thought I could use griddata from MATLAB or python. However, since my grid is curvilinear I think I cannot do such thing. Does MITgcm have any kind of tool for regridding this type of data? Thanks in advance for your help
>>> 
>>> Kind regards,
>>> 
>>> Estanislao
>>> _______________________________________________
>>> MITgcm-support mailing list
>>> MITgcm-support at mitgcm.org
>>> http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support
>> 
>> 
>> 
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