[MITgcm-support] seaice_salinity

[Matthew Mazloff]

Hello,

OK, so I was only able to make the seaice dynamics stable by turning  
down the drags ( I was able to run with SEAICE_WaterDrag = 5 and  
SEAICE_drag = 0.001) and turning down the SEAICE_strength (to a value  
of 5e-3) and turning down the lsr error to 1e-5.

I am concerned because a very small SEAICE_drag is likely unrealistic  
for the SO's largely rough first year ice, and (perhaps more  
importantly) because if the winds increase during optimization it may  
drive the model back unstable.

I am also disappointed in that running with seaice diagnostics on and  
LSR_error = 1e-5 has about doubled the runtime...making using seaice  
dynamics not very practical.

So any advice...options.  Would coding a simple free drift model be  
more stable (and perhaps somewhat realistic).  Any ideas?

Thanks a lot,
Matt




On Nov 11, 2008, at 8:13 PM, Dimitris Menemenlis wrote:

> The CS510 solution also has some very saline water in narrow fjords  
> around Antarctica.  I think what might be happening is that ice is  
> acting as a salinity pump, taking freshwater out of the fjord, when  
> ice dynamics are turned on, but there is no mechanism for flushing  
> the salty water out in the model ocean.  Let me know what you  
> find.  D.
>
> On Nov 11, 2008, at 7:49 PM, Matthew Mazloff wrote:
>
>> Hi Dimitris,
>>
>> The extremes are happening over narrow fjords.  But with seaice  
>> dynamics off they dont occur.  The coldest it gets is -3.14.
>>
>> And yes, I have  SEAICE_gamma_t     = 259200.
>>
>> Thanks for the help,
>> -Matt
>
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mitgcm.org/mailman/listinfo/mitgcm-support