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

[Martin Losch]

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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