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

[Martin Losch]

Hi Georgy,

(1) historical reasons (this functionality was added later)
(2) “levitating” sea ice is very convenient (and does not really change the ocean circulation, because “non-levitating” seaice is in hydrostatic balance with the ocean, remember Archimedes’ principle), because too thick ice does not “dry” ocean surface cells.

I generally use the loading terms.

Martin

> On 27 Sep 2016, at 17:30, 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 wrote:
>> 
>> ----------------------------------------------------------------------
>> 
>> Message: 1
>> Date: Mon, 26 Sep 2016 07:45:28 +0200
>> From: Martin Losch <Martin.Losch at awi.de>
>> To: MITgcm Support <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>
>> 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> 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?
>>> 
>>> Thank for your help,
>>> Georgy
>>> 
>>> -- 
>>> Georgy Manucharyan,
>>> Stanback Postdoctoral Scholar,
>>> Environmental Science and Engineering,
>>> California Institute of Technology,
>>> MS 131-24, 1200 California Blvd,
>>> Pasadena, CA, 91125
>>> 
>>> Office: L+R, Room 226; Tel: (626) 395-8715
>>> Web: http://www.its.caltech.edu/~gmanuch
>>> 
>>> 
>>> 
>>> _______________________________________________
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>>> MITgcm-support at mitgcm.org
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>> 
> 
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