[MITgcm-support] ECCO regrid interpolation

[Ryan Abernathey]

This sort of grid interpolation / difference application is precisely what
our software package xgcm is for:
https://xgcm.readthedocs.io/en/latest/

Here is an example of using it with ECCOv4:
https://xgcm.readthedocs.io/en/latest/example_eccov4.html

Perhaps this will be helpful to you.

On Wed, Jan 15, 2020 at 7:18 AM Martin Losch <Martin.Losch at awi.de> wrote:

> 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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> >> ------------------------------
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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
> >> Message-ID: <BB97573C-E6FD-4A1A-8BEA-4890AAE003F0 at awi.de>
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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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