[MITgcm-support] [EXTERNAL] Need assistance for tuning currents in the physical model

[Dimitris Menemenlis]

Hi Kunai, a good starting point is to use parameters and settings that have previously been used by others.
There is many examples here: http://wwwcvs.mitgcm.org/viewvc/MITgcm/MITgcm_contrib/ <http://wwwcvs.mitgcm.org/viewvc/MITgcm/MITgcm_contrib/>
And maybe someone on the list with a similar domain configuration to yours can pitch in with a specific example.

After that, fine-tuning for your specific configuration, boundary conditions, etc., can be done using model sensitivity experiments for the parameters that you want to adjust and then optimizing the value of these parameters relative to observations, as is done here: https://journals.ametsoc.org/mwr/article/133/5/1224/67525/Using-Green-s-Functions-to-Calibrate-an-Ocean <https://journals.ametsoc.org/mwr/article/133/5/1224/67525/Using-Green-s-Functions-to-Calibrate-an-Ocean>

Cheers, Dimitris

> On Jul 8, 2020, at 11:26 AM, kunal madkaiker <kunal.madkaiker02 at gmail.com> wrote:
> 
> Hi Matthew,
> 
> Sorry for not mentioning the details earlier. I have a curvilinear grid of 360 X 780 grid off the West coast of India.
> This is a high resolution, irregular grid i.e. grid point spacing isnt equal in the subgrid. Grid is a closed one.
> 
> - For Sept simulation, I am initializing with Aug Temp and Salinity from WOA
> - U and V currents are from INCOIS GODAS, whereas heat and moisture fluxes are from NCEP.
> - Boundary forcing provided are currents and Sept Temp and Salinity as OBCS files.
> - No Orlanksi scheme is used. KPP used for verical mixing.
> 
> On Wed, Jul 8, 2020 at 8:53 PM Matthew Mazloff <mmazloff at ucsd.edu <mailto:mmazloff at ucsd.edu>> wrote:
> Hi Kunal
> 
> This is too general a question. I don’t know enough about your model setup (e.g. resolution).
> What inputs did you take as a starting point? Was it from a setup I would be aware of?
> 
> Matt
> 
> 
> > On Jul 8, 2020, at 8:18 AM, kunal madkaiker <kunal.madkaiker02 at gmail.com <mailto:kunal.madkaiker02 at gmail.com>> wrote:
> > 
> > Dear MITgcm Users,
> > 
> > I am trying to run MITgcm along the West Coast of India, using a Curvilinear grid for the month of Sept.
> > I have given a climatological profile of Temperature, Salinity from WOA18 and U,V currents as boundary forcing along with heat and moisture fluxes.
> > 
> > After comparing with observation (i.e. WOA18 SST and SSS, OSCAR currents), my simulated currents arent coming right. I am trying to tune the physical model.
> > 
> > Kindly let me know about the parameters (in the INPUT file) that I need to review, for I may have possibly missed out/ skipped on some information. Thanks in advance.
> > 
> > Regards
> > Kunal
> > 
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