[MITgcm-devel] upcoming changes in seaice_growth.F

[Gael Forget]

> Gael, mea culpa.  I did not follow recent pkg/seaice changes very closely and I have not yet tried the EVOLUTION branch.
no worries. 

> My understanding from latest devel list exchange is that areaMin will only be used for regularizing thickness in heat budget computations, i.e., same as in original Jinlun/Hibler code.
the LEGACY branch is the closest to Jiunlun's code.

> Do we need to hang on to the ALLOW_PRECLUDE_INFINITESIMAL_AREA bit of code?
I would like to. Not sure why you are suddenly obsessing about this one.
In the EVOLUTION branch there are quite a few things that deviate
from Jinlun's code in more decisive ways. 

> Thanks for merging/updating the sea ice code.
You are welcome.

Cheers,
Gael

> 
> Dimitris Menemenlis
> 
> On May 27, 2011, at 6:34 AM, Gael Forget wrote:
> 
>> Hi Dimitris,
>> 
>> we are not going to remove areaMin because it is needed in the LEGACY branch.
>> 
>> rev.87 is when I added the merged branch (which I refer to as EVOLUTION) including
>> the set of pathological cases that I thought required some treatment. The one you are referring 
>> to (area=max(area,areaMin) if ice is present) I included based on Martin's comment
>> C     The default of A22 = 0.15 is a common threshold for defining
>> C     the ice edge. This ice concentration usually does not occur
>> C     due to thermodynamics but due to advection.
>> 
>> After I completed this phase of the merging in October, I sent a detailed email to the devel list, entitled
>> 	[MITgcm-devel] wrapping up seaice_growth.F  october 2010 revision
>> where I was referring to this pathological cases part specifically, and suggesting comparison runs. 
>> I don't recall getting much feedback. So, to be on the safe side, SEAICE_GROWTH_LEGACY has 
>> remained the default since then. I am still hoping to get more feedback...
>> 
>> Have you ever tried the EVOLUTION branch? Did you notice any big difference compared 
>> with LEGACY branch results? (I didn't at the time)
>> 
>> Cheers,
>> Gael
>> 
> 
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