[MITgcm-support] Time-Dependent Periodic Forcings

[Suhani Dalal]

Thank you! Based on these examples, it seems like you need to use the exf
package to prescribe the forcing. Is that correct?

On Wed, Jul 2, 2025 at 10:24 AM Martin Losch <Martin.Losch at awi.de> wrote:

> It should work.
> There are a few examples in verification, how to do this in matlab, e.g.,
> offline_exf_seaice/input/gendata.m (x,y,t)
> and python, e.g.,
> seaice_itd/input/gendata.py [t,y,x]
>
> The format should be ieee-be unblocked, with the fasted dimension (x)
> first (the “fortran” way).
>
> Make sure via diagnostics, that your forcing fields look as expected.
> Often scrambled forcing fields give you a clue, where things went south.
>
> Martin
>
>
> On 2. Jul 2025, at 16:07, Suhani Dalal <suhani.dalal at yale.edu> wrote:
>
> Hello,
>
> I am trying to implement a time-dependent wind forcing in my model. Based
> on documentation here,
> https://mitgcm.readthedocs.io/en/latest/getting_started/getting_started.html
> <https://mitgcm.readthedocs.io/en/latest/getting_started/getting_started.html,>,
> it seems like the zonal and meridional wind files have to be 2D. But based
> on prior examples, like in tutorial_global_oce_biogeo, and previous
> documentation here,
> https://mitgcm.org/public/r2_manual/latest/online_documents/node104.html,
> the 3D configuration seems possible using periodicExternalForcing. I
> followed the example and documentation for the time-dependent forcing
> exactly, formatting it as (x,y,t), yet I am seeing numerical instabilities.
>
> Does the model still support time-dependent periodic forcings? And if so,
> could you explain the format of the input file/any other variations
> required in the data file?
>
> Thank you so much!
>
> Best,
> Suhani
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