[MITgcm-support] maintaining sea ice coverage over multi-year run on cs32

[Andrew Keats]

Hi Martin,

My ice was disappearing because I made a bad parameter choice that
destabilized the underlying velocity field and forgot to change it
back.  Anyway, that's fixed now, and am doing some long-time runs
using your seaice parameters that Dimitris pointed me towards.  So far
the ice cover looks good, but I have not diagnosed the overturning
circulations (I am also using the CORE forcing).

One more question:  Is anybody out there attempting to couple
ocn+seaice to atmosphere (aim_v23)?  If nobody has it on their plate
then I was thinking to try this out during the first half of 2011.


Thanks for your help,

Andrew


On Wed, Jun 23, 2010 at 8:30 AM, Martin Losch <Martin.Losch at awi.de> wrote:
> Hi Andrew,
>
> we are using the cs32 configuration with seaice (and no thsice) with the forcing as provided with the verifcation experiment and also with an embm (similar to Fanning+Weaver 1996 or the UVic ESM, not public yet) and I do not see the sea ice disappearing. We have a different problem though: the overturning keeps dying pretty quickly (order 50years), which seems to be connected to a too large extend of the sea ice in the northern hemisphere in the case with embm. with the CORE forcing, we still do not quite know.
>
> I do not recommend Ian's code (as Matt suggested), but that's only because I do not understand what's going on in there. Having said that the default thermodynamics code is not bug free either (I need to check in a contribution of ice sublimation to the mass balance).
>
> Martin
>
> On Jun 25, 2010, at 5:31 PM, Menemenlis, Dimitris (3248) wrote:
>
>> They are available here:
>> http://ecco2.jpl.nasa.gov/data1/arctic/output/ceaice/ThSIce/input/
>>
>> Words of caution is that:
>> (i) these are not separately optimized, except that we tried to match the equivalent pkg/seaice parameters as best we could,
>> (ii) the albedo values are unrealistically high to compensate for a known low-cloud/shortwave radiation problem in ERA40, and
>> (iii) we never attempted to use Winton thermodynamics in Antarctica.
>>
>> Dimitris
>>
>> On Jun 25, 2010, at 7:36 AM, Andrew Keats wrote:
>>
>>> Many thanks for the information, Matt and Jean-Michel.
>>>
>>> Are the parameterizations used for the WTD experiment (Sec. 4.4 in
>>> Losch et al., Ocean Modelling, 2010) available online anywhere?
>>>
>>> Andrew
>>
>>
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