[MITgcm-support] ice package in coupled atmosphere ocean tutorial (cpl_aim+ocn)

[Krishnakumar Rajagopalan]

Hi Jean-Michel,

Thank you so much for the reply. Very much appreciated. Let me now play around with the ad. schemes.

Kris.


________________________________
 From: Jean-Michel Campin <jmc at ocean.mit.edu>
To: mitgcm-support at mitgcm.org 
Sent: Wednesday, April 17, 2013 4:49 PM
Subject: Re: [MITgcm-support] ice package in coupled atmosphere ocean tutorial (cpl_aim+ocn)
 

Hi Kris,

Thanks for persisting in posting to the list (even after not receiving any
answer).
In this coupled set-up, the seaice is entirely done (called from)
the atmosphere component.
But regarding these low temperatures in 2nd level, it's likely
caused by under-shoot of the temperature advection sheme (default =
2nd order, centered in space). I guess if you try a motonicity preserving
avection scheme (33, 77, 7) or one that does not generate so
strong over/under shoot (e.g., 80) but still with low numerical diffusivity,
this will not be so bad.

Cheers,
Jean-Michel

On Wed, Apr 17, 2013 at 07:08:00PM -0700, Krishnakumar Rajagopalan wrote:
> Hi All,
> 
> Further to my last past:
> 
> I plotted the temperature from the first few layers vs time at location  46 degree W, 56.218 degree S. Please take a look at the attached figure. The temperature in layer 1 shows expected behavior which is that the temperature is either equal to or above the freezing temperature. Although the thsice package is only attached to the atmospheric model, it can access the SST (and change them), through the coupler. Is this true?
>  
> 
> The temperature in the 2nd  layer and at times the 3rd layer is below the freezing temperature (although the 3rd layer temperature shows a gradual rise from the 17th year onwards). Is this the expected trend in the initial stages of the model spinup ? And will this trend go away with a longer run? 
> 
> Thanks a lot
> 
> Kris.
> 
> 
> ________________________________
>  From: Krishnakumar Rajagopalan <krishna_raj_2010 at yahoo.com>
> To: "mitgcm-support at mitgcm.org" <mitgcm-support at mitgcm.org> 
> Sent: Thursday, April 11, 2013 3:06 PM
> Subject: [MITgcm-support] ice package in coupled atmosphere ocean tutorial (cpl_aim+ocn)
>  
> 
> 
> Hi All,
> 
> In the coupled atmosphere ocean tutorial (cpl_aim+ocn), the ice package(thsice) is not included in data.pkg in /input_ocn or packages.conf in /code_ocn. Does this mean that the ocean solver does not interact with the ice (although the atmospheric solver does since thsice package is present in /input_atm/data.pkg and /code_atm/packages.conf). After running the coupled model for a few years, the temperature in the second layer of the ocean is seen to be as low as  -5 deg. This appears to be low and unrealistic. I was wondering if someone can give a few pointers on the coupling between ice, ocean and atmosphere. 
> 
> Thanks in advance 
> 
> Best regards
> 
> Krishnakumar
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