[MITgcm-support] how to compute water flow through ocean sections with gmredi / kpp ?

[Alexandre Pohl]

Hi David,

Thank you for your answer.

> GM has a zero net contribution because the streamfunction is zero at top and bottom.

Actually, I want to compute the water flow (in Sv) through arbitrary sections (E-W, N-S, SE-NW…), at each level of the ocean. If I understand well, the depth-integrated contribution of GM is null, but it has an impact throughout the water column. Am I wrong ? If not, is it possible to compute the latter based on the diagnostics provided by the model ?

> Last remark, the interpolated/rotated velocities are not appropriate to compute the net flux, it is very inaccurate. The computation must to be done on the native grid.

Thanks for mentioning this. Now I avoid interpolating U and V on grid cells centres. Computed depth-integrated fluxes seem to be much more robust, that’s great. However, I did not find any way to skip the rotation. I have to quantify the flux which is eastward or northward, and it does not seem easy to do without rotating the fields. Any idea is welcome :)

Best,
Alexandre
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