[MITgcm-support] MITgcm-support Digest, Vol 159, Issue 26

[Menemenlis, Dimitris (329C)]

Hi Georgy, a good reference for answering your question is:
http://paoc.mit.edu/paoc/papers/seaiceLoading.pdf

Sea ice pressure load term is never ignored.
It is either included as equivalent sea-water pressure, in the “levitating”
sea ice case, or it is explicitly included as sea ice pressure in the
case of JM’s rescaled vertical coordinate z* scheme.

Dimitris

On Sep 27, 2016, at 8:30 AM, Manucharyan, Georgy E. (Georgy) <gmanuch at caltech.edu> wrote:

Thanks for your advise Martin,

I am curious why the sea ice pressure load term is not included by default in ocean dynamics? Are there any physical arguments for whether or not to include this term or is the runtime flag simply a coding convenience?

Thanks again,
Georgy



On Sep 26, 2016, at 9:00 AM, mitgcm-support-request at mitgcm.org<mailto:mitgcm-support-request at mitgcm.org> wrote:

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Message: 1
Date: Mon, 26 Sep 2016 07:45:28 +0200
From: Martin Losch <Martin.Losch at awi.de<mailto:Martin.Losch at awi.de>>
To: MITgcm Support <mitgcm-support at mitgcm.org<mailto:mitgcm-support at mitgcm.org>>
Subject: Re: [MITgcm-support] Does the sea ice mass affect the ocean
surface pressure?
Message-ID: <ACC605AB-FC7F-4E42-BF28-8F2341608EE4 at awi.de<mailto:ACC605AB-FC7F-4E42-BF28-8F2341608EE4 at awi.de>>
Content-Type: text/plain; charset="us-ascii"

Hi Gregory,

as with many parameterisations in the MITgcm, you can turn this effect on or off.
The CPP-flag ATMOSPHERIC_LOADING needs to be defined to make surface loading available and then you need to use the runtiime flag useRealFreshWaterFlux=.TRUE. in data

Martin

On 24 Sep 2016, at 01:16, Georgy Manucharayan <gmanuch at caltech.edu<mailto:gmanuch at caltech.edu>> wrote:

Hi all,

The momentum equations for the sea ice includes a term that is a gradient of the sea surface height potential \phi(0) = g \eta + p_a/rho_0 + mg/rho_0 with the last term representing the sea ice load.  I am interested if this same potential is used for the ocean equations: i.e. does the ice mass modify the surface ocean pressure? If so, which routine deals with this calculation?


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