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

[Killampalli Rajesh]

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

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 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
<rajesh93.cstaff at iitd.ac.in>

 P-Email:  rajesh70530 at gmail.com <rajesh93.cstaff at iitd.ac.in>

 Phone: +91 9492068095.
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