[MITgcm-support] [EXTERNAL] How to start from given initial conditions without restarting the simulation

[Dimitris Menemenlis]

Sorry, I misunderstood your question.  What you describe below is fine.
The correct atmospheric conditions and open boundary conditions will be selected
automatically based on niter0.  I don’t understand where you get stuck.

> On Apr 2, 2020, at 10:08 AM, Shevchenko, Igor <i.shevchenko at imperial.ac.uk> wrote:
> 
> Dear Dimitris,
> 
> Thank you very much for your reply.
> I am aware of MITgcm restart-pickup capabilities, but as far as I understand it, one can start a simulation from a pickup file (and this file should be consistent with the previous time step to seamlessly continue the integration), while I would like to have multiple pickups (which are not related to the previous time step) in order to pick them up on the fly at different moments in time and then use them as initial conditions for the next step of the simulation.
> 
> Best regards,
> Igor
> 
> ________________________________________
> From: MITgcm-support <mitgcm-support-bounces at mitgcm.org> on behalf of Dimitris Menemenlis <dmenemenlis at gmail.com>
> Sent: 02 April 2020 17:20
> To: MITgcm Support
> Subject: Re: [MITgcm-support] [EXTERNAL] How to start from given initial conditions without restarting the simulation
> 
> 
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> Yes of course.  In the MITgcm manual, search for “pickup”.  There is several examples how to restart the model without restarting the whole simulation.
> 
>> On Apr 2, 2020, at 9:00 AM, Shevchenko, Igor <i.shevchenko at imperial.ac.uk> wrote:
>> 
>> Dear MITgcm users,
>> 
>> I am trying to figure out how to start MITgcm from given initial conditions without restarting the whole simulation (the task seems relatively simple, and I likely missed it in the user manual). The initial conditions I use is essentially the solution of the model taken at given times and then modified. For now, I run the whole simulation, save the solution at given times, modify it and then
>> run the model again from each new initial condition for a period of time. The problem is that the model is forced by atmospheric forcing and uses open boundary conditions for the ocean. This makes the process of preparing new initial conditions extremely laborious and very prone to errors which can come from inaccurate and inconsistent approximations of forcing terms and open boundary conditions.
>> 
>> I am curious, does MITgcm have a capability of picking up a given solution at a given time without restarting the whole simulation so that one could avoid preparing forcing and boundary data for each particular moment in time?
>> 
>> Best regards,
>> Igor