[MITgcm-support] MITgcm: Mixing in Vermix Experiment

[Martin Losch]

Hi Martin,

currently “RiLimit” is not a namelist of pkg/pp81. You can just add it in pp81_readparms.F

Similarly you could add a RiMax to the namelist defined in my82_readparms.F

In either case I do not know if modifying these parameters makes physical sense, as they are hard coded in the original implementations (I think it was SPEM a predecessor of ROMS) from which the MITgcm versions are derived.

Martin

> On 4. Dec 2023, at 18:17, Martin COUBARD <martin.coubard at imt-atlantique.net> wrote:
> 
> Hello MITGCM Users,
>  I am implementing the vermix experiment available on Github (https://github.com/MITgcm/MITgcm/tree/master/verification/vermix) and https://mitgcm.readthedocs.io/en/latest/examples/examples.html.
> Everything is running smoothly with the KPP option, and we do see a mixed layer forming over timescales of a few days. Furthermore, a parameter may be tuned to increase/decrease mixing (Rincr, which may be find in data.kpp), which helps tune the model to our expectations.
>  <Capture d’écran 2023-12-04 à 14.59.53.png>
> 
> <Capture d’écran 2023-12-04 à 15.13.24.png>
> <Capture d’écran 2023-12-04 à 15.08.17.png>   However, we have a problem when using the PP81 and MY82 packages, when it comes to manipulating mixing. I changed RiMax in data.my82 and RiLimit in data.pp81, but apparently nothing happens when I adjust these values.
> Do you have any suggestions on how to effectively change these parameters and hence control the mixing in PP81 and MY82 packages?
>  <Capture d’écran 2023-12-04 à 15.09.50.png>
>  If any of you can assist me with this, I would greatly appreciate it.
> 
> Thank you very much.
> 
> Martin Coubard
>  
> --
> 
> Coubard Martin 
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