[MITgcm-support] MITgcm-support Digest, Vol 246, Issue 3

[Alan Gaul]

Hi Martin,

Thanks for clarifying, I hadn't realized kSurfC corresponded to the ice shelf interface.

-Alan
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Subject: MITgcm-support Digest, Vol 246, Issue 3

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Today's Topics:

   1. Question about FRAZIL package (Alan Gaul)
   2. Re: Question about FRAZIL package (Martin Losch)


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Message: 1
Date: Wed, 6 Dec 2023 22:19:55 +0000
From: "Alan Gaul" <agaul at mit.edu>
To: "mitgcm-support at mitgcm.org" <mitgcm-support at mitgcm.org>
Subject: [MITgcm-support] Question about FRAZIL package
Message-ID:
        <PH7PR01MB8026875E160015E57F413BCCAE84A at PH7PR01MB8026.prod.exchangelabs.com>

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Hello everyone,



I am wondering if the FRAZIL package is set up to use in conjunction with the SHELFICE package, or if there is a different way to parameterize the heat flux from refreezing of supercooled water onto the ice shelf interface? The description in frazil_description.tex says "supercooling at depth creates frazil, which rises to the model's surface level in one model time step," so it seems like this probably wouldn't work at the ice shelf interface.



Thank you,

Alan
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Message: 2
Date: Thu, 7 Dec 2023 13:45:13 +0100
From: Martin Losch <Martin.Losch at awi.de>
To: MITgcm Support <mitgcm-support at mitgcm.org>
Subject: Re: [MITgcm-support] Question about FRAZIL package
Message-ID: <31498EE0-CED2-4376-883A-547EE02E0C2D at awi.de>
Content-Type: text/plain; charset="utf-8"

Hi Alan,

I may be wrong about the frazil package, but I think it?s a ?hack? to get rid of supercooled water in the interior by modifying the temperature tendency locally and at the correspoding surface cell, so no freezing done in this package. The exceed heat that made the interiol grid cell supercooled is moved to the surface (instantaneously within one timestep), and then the model does what it does according to the thermodynamics. As far as I can tell, it should also work with pkg/shelfice, i.e the temperature tendendy is applied to the first cell below the ice shelf (kSurcC), and then there can be refreezing according the ice-shelf-ocean interaction.

Martin

> On 6. Dec 2023, at 23:19, Alan Gaul <agaul at mit.edu> wrote:
>
> Hello everyone,
>
> I am wondering if the FRAZIL package is set up to use in conjunction with the SHELFICE package, or if there is a different way to parameterize the heat flux from refreezing of supercooled water onto the ice shelf interface? The description in frazil_description.tex says "supercooling at depth creates frazil, which rises to the model's surface level in one model time step," so it seems like this probably wouldn't work at the ice shelf interface.
>
> Thank you,
> Alan
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End of MITgcm-support Digest, Vol 246, Issue 3
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