[MITgcm-devel] free drift ice model

[Jinlun Zhang]

Hi Matt,

I tried free drift ice model before - it blew up the code. The reason is 
that there is no constraint along the coast.
I thought the LSR ice dynamics solver (and possibly EVP solver) only 
takes a fraction of the ocean time. I wonder if it is still true.

Jinlun

Matthew Mazloff wrote:

> Hi Dimitris,
>
> thanks for the advice.   Regarding 1 and 2:  communication is 75% of  
> my wallclock time.  I need to minimize exchanges, and though I have  
> not tried it, I am afraid that the ice dynamics solver has too many  
> exchanges.  Switching to EVP would not remedy this but if I could get  
> away from using the solver every timestep that would be great.  My  
> model dt = 900;  Is  SEAICE_deltaTdyn = 3600 feasible.  How do you  
> find the seaice performance burden in the high-res cube results?   
> Regarding 3:  I would love to investigate how the ice moves wrt to  
> ocean in the high-res cube results.  Can you point me towards some  
> files I could analyze?
>
> Thanks,
> Matt
>
>
>
>
>
>
>
> On Nov 30, 2006, at 11:10 AM, Dimitris Menemenlis wrote:
>
>> Matt, a few more options for you to consider:
>>
>> 1) A wonderful recent addition to pkg/seaice, courtesy of Martin,  is 
>> EVP sea-ice dynamic solver, which I suspect would be more  efficient 
>> in your configuration than LSR running at every time step.
>> 2) Another way to speed code in your configuration is to set
>>    SEAICE_deltaTdyn = 3600
>> in data.seaice.  This is because LSR is implicit in everything  
>> except Coriolis.  That way cost of LSR will become negligible  
>> relative to other stuff.
>>
>> 3) For diagnosing how ice moves wrt to ocean, the high-res cube  
>> results may be more appropriate than the coarser-resolution ECCO- 
>> GODAE integrations.
>>
>> D.
>>
>> -- 
>> Dimitris Menemenlis <menemenlis at jpl.nasa.gov>
>> Jet Propulsion Lab, California Institute of Technology
>> MS 300-323, 4800 Oak Grove Dr, Pasadena CA 91109-8099
>> tel: 818-354-1656;  fax: 818-393-6720
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>
>
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-- 

Jinlun Zhang
Polar Science Center, Applied Physics Laboratory
University of Washington, 1013 NE 40th St, Seattle, WA 98105-6698

Phone: (206)-543-5569;  Fax: (206)-616-3142
zhang at apl.washington.edu
http://psc.apl.washington.edu/pscweb2002/Staff/zhang/zhang.html