[MITgcm-support] How to restore the surface currents for accurate simulation of submisoscale eddies.

[Martin Losch]

Hi Killampalli,

you can use pkg/rbcs for that, there’s even some documentation: https://mitgcm.readthedocs.io/en/latest/phys_pkgs/rbcs.html

pkg/ctrl cannot be used for restoring.

Martin

> On 7. Apr 2026, at 07:43, Killampalli Rajesh <rajesh70530 at gmail.com> wrote:
> 
> Dear MITgcm Support Team,
> 
> I am running a regional MITgcm simulation (~3 km resolution) with time-varying GLORYS boundary conditions (U, V, T, S, SSH). I observe bias in surface currents (magnitude and direction), and mesoscale/submesoscale eddies are not well captured in the interannual simulations.
> 
> I initially considered applying relaxation (nudging) the SST and SSS (e.g., via climatological relaxation or using boundary-driven constraints in data.obcs). However, I understand that this not improving in the surface currents.
> 
> I am considering whether surface current nudging (similar to SST/SSS) is possible or advisable. Specifically:
> 
> Can pkg/ctrl be used to weakly/daily constrain surface currents or SSH?
> Is there any recommended approach to improve surface currents without suppressing eddies?
> Any guidance would be appreciated.
> 
>  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
>  <mailto:rajesh93.cstaff at iitd.ac.in>
>  P-Email:  rajesh70530 at gmail.com <mailto:rajesh93.cstaff at iitd.ac.in>
>  Phone: +91 9492068095.
> 
> ```````````````````````````````````````````````
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