[MITgcm-support] Time-Dependent Periodic Forcings

[Martin Losch]

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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