[MITgcm-support] Question on Sequential Physics and Biogeochemistry Simulations in MITgcm

[Dimitris Menemenlis]

Yes, this capability does exist, see, e.g.,:
https://mitgcm.readthedocs.io/en/latest/examples/cfc_offline/cfc_offline.html
https://github.com/MITgcm/MITgcm/tree/master/verification/tutorial_cfc_offline

but, I am not sure this will save you a lot of computation time.  Depending on number of passive tracers that you carry forward, the frequency of your offline reads, and the speed of the I/O of your workstation, the gain in compute time could be negligible to negative.

D.

> On Jun 11, 2026, at 9:48 AM, Killampalli Rajesh <rajesh70530 at gmail.com> wrote:
> 
> Dear MITgcm Support,
> I am currently running MITgcm coupled with BLING or DARWIN, where the physical and biogeochemical components are integrated simultaneously. I would like to know whether it is possible to first run the physical model alone and then perform a separate biogeochemical simulation forced by the saved physical fields.
> Such a configuration would be useful for model tuning and sensitivity experiments, and could help reduce computational cost and simplify the simulation workflow.
> Could you please advise whether such a setup is available in MITgcm and point me to any relevant documentation?
> Thank you for your help.
> Best regards,
> Killampalli Rajesh
> 
>  Kind regards
> 
> ```````````````````````````````````````````````
>  Killampalli Rajesh (Research Scholar)
>  Centre For Atmospheric Sciences,
>  Indian Institute of Technology, Delhi
>  Hauz Khas, New Delhi - 110016
>  O-Email: asz238484 at iitd.ac.in
>  P-Email:  rajesh70530 at gmail.com
>  Phone: +91 9492068095.
> ```````````````````````````````````````````````
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