[MITgcm-devel] free drift ice model

[Patrick Heimbach]

Hi there,

just some small comments:

On Nov 29, 2006, at 6:40 PM, Dimitris Menemenlis wrote:

> Matt, I am going to guess that free drift is probably a good  
> estimate for most
> of Southern Ocean, except close to coastlines.  I don't know what  
> your A and B
> numbers should be, they would depend on drag coefficients, etc.   
> Look for papers
> by Miles McPhee on topic.  Although most of his work is for Arctic  
> Ocean, I
> think that his estimates over first year ice should be applicable  
> for Southern
> Ocean.

Should maybe be a bit careful re. applicability of Arctic numbers
for Antarctic sea-ice (latter seems more "loose", so more in free  
drift).
But maybe ok as first guess.

>> I believe in the current model set up the wind stress acts on the  
>> ocean as if
>> the ice wasn't there.
>
> Not true anymore.  Martin's magic C-grid formulation makes ice- 
> affected ocean stress possible.  We need to write it up.   
> Apparently it's a big deal for sea-ice models.  Trying to iron out  
> residual problems with growth, etc., first.

Maybe again be careful in stating what works when.
Matt probably still has B-grid code enabled for which
his assumption is correct.
But good to hear, the C-grid code has it.
Might be worth switching then if it's "well" tested. Is it?

BTW,
I ran v3.iter0 with latest growth code.
Seaice concentration misfits is reduced by 2/3, not bad.
Still unclear re. fin.diff. sensitivities.
Question is, which part of the code did it.

-p.




> Cheers, 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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Dr Patrick Heimbach | heimbach at mit.edu | http://www.mit.edu/~heimbach
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