[MITgcm-support] [EXTERNAL] Issue with surface ocean currents

[Menemenlis, Dimitris (US 329B)]

Hi Kunal, I will be interested to know what you find, that is, whether it is indeed reflections at the lateral boundaries that cause trouble.
With prescribed boundary conditions, everything that does not match exactly the specified boundary conditions will be reflected.
You can sometimes get away with prescribed boundary conditions when you are downscaling from a simulation with the same forcing.
But this is not your case where the lateral boundary conditions and the atmospheric forcing are not directly related.
Some relaxation at the boundaries might be able to damp these reflections.

Dimitris


On Mar 17, 2022, at 8:07 AM, kunal madkaiker <kunal.madkaiker02 at gmail.com<mailto:kunal.madkaiker02 at gmail.com>> wrote:

Thank you Dimitris for your reply.

Yes, I am prescribing the BCs on 3 sides, and not using a sponge yet.
I'll take a look at your suggestion.

Thanks,
Kunal

On Wed, Mar 16, 2022 at 6:27 AM Menemenlis, Dimitris (US 329B) <dimitris.menemenlis at jpl.nasa.gov<mailto:dimitris.menemenlis at jpl.nasa.gov>> wrote:
Hi Kunal, are you “prescribing” the boundary conditions or do you use a sponge?
If the former, I wonder whether the accumulation of turbulence inside the domain could be caused
the reflection of circulation features generated or evolved inside the domain that then
reach the lateral boundaries and are inconsistent with the prescribed obcs?

Dimitris


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