Hello everyone, I am looking to interpolate LMDZ-regional output onto the grid of the Mediterranean regional version of NEMO (NEMOMED8) using CDO and bilinear interpolation. I found this well detailed procedure on the NEMO wiki: https://forge.ipsl.jussieu.fr/nemo/wiki/Users/SetupNewConfiguration/…

Your mesh mask does not feature land suppression, so that is not the problem. I am not familiar with that grid, but it kind of folds over land around the Gibraltar strait, which I suspect confuses CDO. It may be worth trying to remap taking into account a destination mask conservative reg…

Hi Tristan, Is it possible that the NEMO (destination) lat/lon fed to CDO are coming from a file (output or mesh_mask) featuring land suppression? Best Charles

Hi Charles, Thanks for your reply. Yes indeed lat/lon comes from the mesh_mask of NEMOMED8 file but I am not sure what you are referring to with “featuring land suppression”, could you explain me ? Best Tristan

If the mesh_mask file has been generated from a run featuring land suppression, see Fig 8.6 on Exchange with neighbouring processors (lbclnk, lib_mpp) Exchange with neighbouring processors (lbclnk, lib_mpp) Then the lat/lon are not meaningful over land subdo…

Sure, here it is: [image] meshmask_med8.nc 1 file sent via WeTransfer, the simplest way to send your files around the world Tristan

I tried with the destination mask method and it looks better (attached figure) ! (though it was a bit tricky to do it, I am thinking to make a tutorial for the potential user). Thanks for the great help Charles. I take not in case of bathymetry or rn_hmin change. Best Tristan [Capture_T.J_2PG]

[image] TristanV: I am thinking to make a tutorial for the potential user Yes it would be very helpfull.

[v2] Interpolation onto the NEMOMED8 curvilinear grid

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cpelletier 6 April 2022 07:08 4

If the mesh_mask file has been generated from a run featuring land suppression, see Fig 8.6 on

Then the lat/lon are not meaningful over land subdomains, and interpolations can go wrong. Could you share that mesh_mask file?

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[v2] Interpolation onto the NEMOMED8 curvilinear grid

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