[MITgcm-support] Ice thickness category diagnostics

[Chris Horvat]

Martin,

Would you happen to know who is working on the multicategory ice
implementation?

Chris

On Fri, Feb 8, 2013 at 10:30 AM, David Huard <david.huard at gmail.com> wrote:

> Ok, thanks, that clears things up.
>
>
> On Fri, Feb 8, 2013 at 10:19 AM, Martin Losch <Martin.Losch at awi.de> wrote:
>
>> The seaice-model is based on Hibler (1979). That means ice growth and
>> melting is done in terms of one ice volume per grid cell (HEFF) and
>> concentration (AREA). The mulitcategory stuff is only used to compute the
>> heat flux. This makes sure that even for very thick ice, there is always a
>> fraction (1/multidim = 1/7 by default) of relatively thin ice. The heat
>> flux through this part of the ice is larger than for the rest, so that the
>> heat flux averaged over all "categories" is non-zero even for very thick
>> ice. This is not much more than a numerical trick, I believe. And yes, it
>> means, that when ice grows, each "category" grows by the same fraction.
>>
>> True multicategory ice with an evolving thickness distribution is in the
>> pipeline, but I don't know the status of that.
>>
>> Martin
>>
>>
>> On Feb 8, 2013, at 3:58 PM, David Huard <david.huard at gmail.com> wrote:
>>
>> > Do you mean that when the model creates new ice, it creates a fixed
>> fraction of ice in each category ? 15 % of thin ice, 15% of thick ice, etc ?
>> >
>> > David
>> >
>> >
>> > On Fri, Feb 8, 2013 at 9:31 AM, Martin Losch <Martin.Losch at awi.de>
>> wrote:
>> > On Feb 8, 2013, at 3:22 PM, David Huard <david.huard at gmail.com> wrote:
>> >
>> > > What about the ice thickness categories ? Is there a way to get those
>> fields individually rather than as a bulk concentration ?
>> >
>> > Are you talking about the "SEAICE_MULTICATEGORY"-code? This code only
>> assumes a fixed distribution (in fact, it is homogeneous) of "actual" ice
>> thicknesses h (as opposed to HEFF = h*AREA), so there is no reason to save
>> the extra fields.
>> > siTICES gives the surface temperatures for each category, if that is of
>> any help.
>> >
>> > Martin
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>>
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>
>
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