[MITgcm-support] Does the sea ice mass affect the ocean surface pressure?

[Georgy Manucharayan]

Thanks Dimitris,

The z* scheme is very cool!  To enable it do I set CPP-flag 
ATMOSPHERIC_LOADING + useRealFreshWaterFlux=.TRUE. in data, or are there 
other flags that I need to set?

Also, in a simpler case of the 'levitating' sea ice, what is the name of 
the variable for the 'equivalent sea-water pressure'  I'd like to output 
it for my analysis.

Thanks,
Georgy


On 09/28/2016 09:00 AM, mitgcm-support-request at mitgcm.org wrote:
> Message: 1
> Date: Tue, 27 Sep 2016 16:30:46 +0000
> From: "Menemenlis, Dimitris (329C)"<Dimitris.Menemenlis at jpl.nasa.gov>
> To: MITgcm Support<mitgcm-support at mitgcm.org>
> Subject: Re: [MITgcm-support] MITgcm-support Digest, Vol 159, Issue 26
> Message-ID:<0450BC72-82E3-43EA-865C-15F51F9B5656 at jpl.nasa.gov>
> Content-Type: text/plain; charset="utf-8"
>
> 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:
>
> ----------------------------------------------------------------------
>
> 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?

-- 
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