[MITgcm-support] seaice_saltFrac and SEAICE_VARIABLE_SALINITY

[Daniel Goldberg]

thanks martin! sounds like seaice_saltfrac may be the best to use..

best
dan

On Wed, Aug 3, 2022 at 2:45 PM Martin Losch <Martin.Losch at awi.de> wrote:

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> Hi Dan,
>
> I’m afraid, that the sea ice thermodynamics are really not very well
> documented.
>
> I usually spend time reading the code of seaice_growth.F if I need to find
> out how a particular parameter works. I think you are right about
> SEAICE_saltFrac only being used when SEAICE_VARIABLE_SALINITY is defined.
> The parameter determines how much salt is retained in sea ice, when ice
> forms. This salt (variable HSALT) is advected conservatively and released
> when sea ice melts.
>
> In contrast seaice_salt0 is only used when SEAICE_VARIABLE_SALINITY is
> undefined.
>
> Then there are the sea ice tracers where salinity can also be used as a
> tracer. I think that this code is more consistent than the
> SEAICE_VARIABLE_SALINITY code but there’s even less documentation.
>
> Martin
>
>
> On 3. Aug 2022, at 15:19, Daniel Goldberg <dan.goldberg at ed.ac.uk> wrote:
>
> Hello All
>
> I am interested in varying salt retention with pkg/seaice, and am curious
> about the parameter SEAICE_saltFrac. Firstly, it seems from looking at
> seaice_growth.F that setting the parameter has no impact unless
> #define SEAICE_VARIABLE_SALINITY is set -- is this the case? (it is not
> something i can determine from readthedocs.)
>
> Secondly, I just want to make sure that the parameter does what I think it
> does. Readthedocs states it is the "salinity newly formed ice (as fraction
> of ocean surface salinity)" but does not give further detail. Is this
> salinity advected conservatively, and accounted for in the surface salinity
> tendency (or freshwater flux, depending on configuration) when sea ice
> forms, and also when sea ice melts?
>
> Also -- the parameter seaice_salt0 exists -- but is not mentioned in
> Readthedocs. Is it now deprecated?
>
> Many thanks for your time!
> Dan
>
> --
> Daniel Goldberg, PhD (he/him)
> Reader in Glaciology
> School of Geosciences, University of Edinburgh
> Geography Building, Drummond Street, Edinburgh EH8 9XP
>
>
> em: dan.goldberg at ed.ac.uk
> web: https://www.geos.ed.ac.uk/homes/dgoldber
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