[MITgcm-support] Natural Boundary Conditions

[Martin Losch]

Gianmaria,

I am not quite sure what you mean by "cg2d slowly increases". When you 
use "real" fresh water flux, your mean surface height will change 
according to the net amount of water that you add at the surface, so if 
your fresh water fluxes are a significant net source (or sink), this 
will change your mean sea surface height.

You'll have to provide a few more details of your set-up ...

Martin

check your fresh water flux values
On Jul 11, 2005, at 4:20 PM, Gianmaria Sannino wrote:

> ciao Martin,
>
> thanks, but I've alread seen that exp.
> What actually happens is that cg2d slowly increases to values that are 
> > 0. I'm using also the exact conservation option.
> When the freshwaterflux is FALSE the cg2d is 10^-13 !!
>
> do you have other ideas??
>
> a presto
> gm
>
>
> ----- Original Message ----- From: "Martin Losch" 
> <mlosch at awi-bremerhaven.de>
> To: <mitgcm-support at mitgcm.org>
> Sent: Monday, July 11, 2005 8:52 AM
> Subject: Re: [MITgcm-support] Natural Boundary Conditions
>
>
>> HI Gianmaria,
>>
>> have a look at, e.g., verification/global_ocean.90x40x15/ (an 
>> experiment which uses "realFreshWaterFlux=.true.") and compare the 
>> data-files and CPP-Flags etc with your set-up. Maybe that can give 
>> your a clue, why your run is blowing up (is it really blowing up?)
>>
>> Martin
>>
>> On Jul 10, 2005, at 5:38 PM, Gianmaria Sannino wrote:
>>
>>> Dear all,
>>>
>>> I'm trying to use the Natural Boundary Conditions in the MITgcm.
>>> To do this I've set useRealFreshWaterFlux to TRUE in the data file, 
>>> but after that the cg2d variable increases toward unstable values 
>>> respect to the simulation with useRealFreshWaterFlux set to FALSE. 
>>> I've also used the non linear free surface option.
>>> Is there anyone can help me?
>>>
>>> thanks
>>> gianmaria
>>>
>>>
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>>
>>
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