[MITgcm-support] Time-Dependent Periodic Forcings

[Martin Losch]

Yes, 
the model interpolates linearly between two forcing records. This makes some sense, as a numerical model usually has a harder time reacting to shocks (in the forcing or anything else).

It’s hard to tell, but your plot looks like your forcing and your model output are not at the same times.

For more information you need to share your namelist file(s) (data, data.exf)

M.



> On 3. Jul 2025, at 21:03, Suhani Dalal <suhani.dalal at yale.edu> wrote:
> 
> Hi,
> 
> I have ensured that my input files are correctly being written/formatted, but I'm running into a new problem. The model is basically doing some sort of interpolation – the orange line is what my forcing is and the blue line is what the model is doing. I believe the forcing is offset in time somehow.
> 
> Do you have any suggestions? 
> 
> Thank you,
> Suhani 
> 
> On Wed, Jul 2, 2025 at 1:33 PM Jody Klymak <jklymak at uvic.ca <mailto:jklymak at uvic.ca>> wrote:
>> Hi Suhani
>> 
>>  
>> 
>> You may want to carefully read: https://mitgcm.readthedocs.io/en/latest/getting_started/getting_started.html#mitgcm-input-data-file-format as well.
>> 
>>  
>> 
>> Cheers,   Jody
>> 
>>  
>> 
>> From: MITgcm-support <mitgcm-support-bounces at mitgcm.org <mailto:mitgcm-support-bounces at mitgcm.org>> on behalf of Dimitris Menemenlis <dmenemenlis at gmail.com <mailto:dmenemenlis at gmail.com>>
>> Reply-To: "mitgcm-support at mitgcm.org <mailto:mitgcm-support at mitgcm.org>" <mitgcm-support at mitgcm.org <mailto:mitgcm-support at mitgcm.org>>
>> Date: Wednesday, July 2, 2025 at 10:28 AM
>> To: MITgcm Support <mitgcm-support at mitgcm.org <mailto:mitgcm-support at mitgcm.org>>
>> Subject: Re: [MITgcm-support] Time-Dependent Periodic Forcings
>> 
>>  
>> 
>> You don't often get email from dmenemenlis at gmail.com <mailto:dmenemenlis at gmail.com>. Learn why this is important <https://aka.ms/LearnAboutSenderIdentification> 
>> 
>> The core MITgcm routines  (MITgcm/model) do provide some basic capability for prescribing forcing, see for example:
>> 
>> https://github.com/MITgcm/MITgcm/blob/master/verification/tutorial_global_oce_latlon/input/data
>> 
>>  
>> 
>> But pkg/exf has many more capabilities and flexibility: https://mitgcm.readthedocs.io/en/latest/phys_pkgs/exf.html
>> 
>>  
>> 
>> D.
>> 
>>  
>> 
>> 
>> 
>> 
>> On Jul 2, 2025, at 10:12 AM, Suhani Dalal <suhani.dalal at yale.edu <mailto:suhani.dalal at yale.edu>> wrote:
>> 
>>  
>> 
>> Thank you! Based on these examples, it seems like you need to use the exf package to prescribe the forcing. Is that correct? 
>> 
>>  
>> 
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