Ocean Modeling Discussion

Thank you john.
I think the paper would help .

Hi jc,

Thanks for the reply.I have gone through the link that has been given, however, it doesn't address each module separately nor it mentions a bottom boundary layer. I specifically would like to know what would happen if LMD_BKPP is undefined. Could you help.

Thanks a lot. jay

Hi all,

Could someone tell me what would happen if LMD_BKPP module is undefined while using other modules of LMD scheme?

Also, I would be grateful if you could tell me where can read about all LMD modules.

LMD_SKPP
LMD_BKPP
LMD_RIMIX
LMD_CONVEC
LMD_DDMIX
LMD_NONLOCAL

Thanks in adavance ...

hello Kate,

I am so sorry, I think I have wasted your time for no reason. The blow-up happened was because, the file got corrupted in transfer (there was a small miss match in size). I changed it and its working with out any issues. My apologies and million thanks for your help and suggestions on ...

No, shorter time step is not helping. I was using 2400 sec (res- 0.2-0.25 deg) as time step and I even tried up to 600 sec

I didn't investigate the blow up properly, I have to do that.

Hi Kate,

Thanks for the reply

I have tried with initial conditions extracted from Global model. To my surprise ended up in BLOW-UP on 28th (9*3+1 th year) year. I suspect its the initial conditions.

Jayasankar

HI all,

I have to do a spin-up, and I am trying with a 3 yr simulation (say 1/1990 to 12/1992) in loop such that 10 such loops would give me a 30 year Spin-up.

The boundary files are monthly data from a Global Ocean Model and surface fluxes are of 6-hrs. The global model is in 1 degree resolution ...

Hi,

I am trying not to compromise on the speed, hence i thought about reducing the wind velocities along the boundaries.

I am wondering if anyone had tried this way before, or if this would make noticeable variations in the model predictions in the entire domain.

Thank you.

Hi Kate,

thank you for the suggestion ,

I am trying with time step....

Could you give me an idea about time steps used in various model in general?

Is it normal to use time steps of 600 sec for a model with 0.25 degree grid resolution and maximum depth 5000m.

Also, I'm kind of thinking about ...

Hello All,

My simulations are getting terminated due to blow-up at boundaries, To be specific node like (1,2),(2,2),(1,4) etc...

The wind velocities are very high in this region, around 12±5 m/s.
Grid Resolution is 0.2 to 0.25 degrees, I have tried time steps 1800 sec and 1200 sec.

Thank you ...

Thanks a lot Kate,

The potential density is within range. However the model computed density based on equation of state for seawater(Jackett and McDougall,1995) is around 1045kg/m3 at depths greater than 4000 meters.

Hello All,

My simulation yields very high densities (around 1045 kg/m3) at deeper layers.
There is no model instability though. Is this acceptable? If not what could be the reasons and how it be taken care of?
I have used CFSR datasets for surface fluxes and SODA data for boundary fluxes.
Thanks ...

Is there a thumb rule or an expression for the optimum number of CPUs to be used for a ROMS simulation?

Hi Jvr,

Thanks a lot for the prompt reply.
yes the IC file contains all needed data. The IC file is made by interpolating SODA data.
So as you said it could probably be the geometry of my model.

The model was instable and I found that the density was rising through out the domain.
So I tried to ...

Hi all,
I have been trying to setup a model and it is resulting in BLOW UP in like 10-30 steps depending up on grid configuration and time step. I guess it is because of the initial conditions, temperature and salinity..

How to see if they are unbalanced or not, and how to correct the same?
Could ...