Mediterranean Sea Model setup advises

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ThanosG
Posts: 14
Joined: Mon May 27, 2013 11:02 pm

Mediterranean Sea Model setup advises

#1 Post by ThanosG » Wed Apr 09, 2014 2:01 pm

Dear ROMS users,

I am trying to set up an experiment for the Mediterranean Sea. The model setup is based on the Fjord experiment with numerous changes. For the time being, I use monthly T and S boundary and initial conditions based on Medatlas. My setup can be seen in the .h and .in files that I attach.
What I can see after a 3 months run, is that I cannot increase the time step more than 240s because it blows up, so my current set up must be unstable.
Another thing is the circulation pattern. After a three months run, I can’t get the eastward circulation at the southern part of the Med. It is like that the eastward current does not circulate with consistency. It is way too weak at the point to have counter currents. I could attach some figures for assistance.
So I suspect that it is a matter of Physics and by that I mean that either my definitions (.h) are not correct, or it just doesn't read correctly the boundary conditions.
So dear users, every help is more than welcome.

Best regards,
Thanos
Attachments
fjord_med.h
(1.32 KiB) Downloaded 162 times
ocean_fjord_med.in
(110.81 KiB) Downloaded 166 times

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jivica
Posts: 122
Joined: Mon May 05, 2003 2:41 pm
Location: The University of Western Australia, Perth, Australia

Re: Mediterranean Sea Model setup advises

#2 Post by jivica » Thu Apr 10, 2014 6:59 am

From your .h file I can see that you do not have realistic atmo forcing, you do not have river forcing, etc ...
It is hard to expect model to reproduce physical features if not using physical assumptions.
To get correct dynamics in the Adriatic I use 39 river sources, realistic as possible atmo forcing, boundary conditions etc...
Check on the MyOcean and see MFS...
Cheers,
Ivica

ThanosG
Posts: 14
Joined: Mon May 27, 2013 11:02 pm

Re: Mediterranean Sea Model setup advises

#3 Post by ThanosG » Thu Apr 10, 2014 7:14 am

Dear Ivica,

Thanks for your prompt reply! But why when using POM model, with only boundary and initial conditions from medatlas, I get the classic features of the Med circulation after a month’s run? My forcing fields are just zeros and I have no river inputs indeed. I would like to proceed step by step.
You didn’t notice any bad physics in my setup, something that slips my mind and that could cause very slow advection and diffusion? I would also like to state that I have changed the SmagorCoef from 0.1 to 1.0.

Best,
Thanos

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jivica
Posts: 122
Joined: Mon May 05, 2003 2:41 pm
Location: The University of Western Australia, Perth, Australia

Re: Mediterranean Sea Model setup advises

#4 Post by jivica » Thu Apr 10, 2014 7:33 am

OK, looking into .h more deeply I can notice that
you use central 2nd order for advection, why not standard upwind 3rd order is there some specific reason for C2?
you can add diffusion and/or viscosity within ocean.in...
If you want more/less temp/salt conservative then use MPDATA, I do not use smagorinsky at all,
to speed up things I can send you .h file that I use and then just strip down forcing part.
Send me email.
Ivica

ThanosG
Posts: 14
Joined: Mon May 27, 2013 11:02 pm

Re: Mediterranean Sea Model setup advises

#5 Post by ThanosG » Thu Apr 10, 2014 7:45 am

Dear Ivica,

I appreciate your help! My email is thganasos@hcmr.gr

Thanks once again,
Thanos

ThanosG
Posts: 14
Joined: Mon May 27, 2013 11:02 pm

Re: Mediterranean Sea Model setup advises

#6 Post by ThanosG » Fri Apr 11, 2014 9:38 am

Dear Ivica,

Your help was enormous. Thank you for your time and patience!

Best regards,
Thanos

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