[MITgcm-support] useOBCSbalance not working with RBCS for salinity

[Naughten, Kaitlin A.]

Hi Jean-Michel,


I think you're right. I do have useRealFreshWaterFlux=.TRUE. and so the extra freshwater added by the surface salinity restoring is adding volume to the domain. I expect that ice shelf melting and sea ice melting/freezing is also having an effect.


Many thanks,

Kaitlin

________________________________
From: MITgcm-support <mitgcm-support-bounces at mitgcm.org> on behalf of Jean-Michel Campin <jmc at mit.edu>
Sent: 31 July 2018 19:49:38
To: mitgcm-support at mitgcm.org
Subject: Re: [MITgcm-support] useOBCSbalance not working with RBCS for salinity

Hi Kaitlin,

Are you using useRealFreshWaterFlux=.TRUE., with some surface Fresh-Water flux
that depends on the solution (e.g., with bulk-formulae) ?
If this is the case the changes in SSH (eta) could be due to surface Fresh-Water
imbalance (even though the OBC flow is balanced).

Cheers,
Jean-Michel

On Thu, Jul 26, 2018 at 01:45:57PM +0000, Naughten, Kaitlin A. wrote:
> Hello,
>
>
> I recently started using the OBCS transport balancing option (useOBCSbalance) to prevent continued loss of volume from my domain. This worked nicely, and after a few years etaN had dropped in some regions and risen in others, with no obvious total drift.
>
>
> However, I have just switched on surface salinity restoring using RBCS. (I don't want to restore everywhere so RBCS is more appropriate than the EXF option for restoring surface salinity; I'm still using OBCS for the open lateral boundaries). Now the OBCS transport balancing doesn't seem to work any more. After about 10 years, etaN has dropped everywhere in the domain, by about 2 metres on average.
>
>
> This is very weird since I'm not using RBCS for velocities, just for salinity - so why should this interfere with the transport balancing?
>
>
> Many thanks,
>
> Kaitlin
>
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