[MITgcm-support] Model loosing salt

[Martin Losch]

Abhisek,

as far as I can see, you have an open boundary and you use atmospheric 
surface forcing. Both of them will most likely have non-zero freshwater 
flux that will change your mean salinity (btw, does the mean salinity 
also change, or only the surface salinity as shown in your plots?). You 
could balance the surface freshwater flux with a flag 
(balanceEmPmR=.TRUE.) at each timestep, but you'd have to code balancing 
the freshwater flux (implied salinity flux, salt*vVel) through the open 
boundary yourself.

Martin

On 04/26/2016 11:53 AM, Abhisek Chakraborty wrote:
> Dear All,
>
> I am trying to configure Mitgcm (version 65r) for Bay of Bengal with a
> constant horizontal resolution of 2km. After 3 years of model runs
> (2013-2015) using daily ERA forcing, I found the model is losing
> salinity. The domain averaged salinity shows a decreasing trend. The
> trend is more prominent for the head Bay. I am using yearly run off
> climatology. A figure is attached to show my model domain and salinity
> trend.
>
> The relevant data files are also attached.  Can anybody please help me
> pointing out the possible causes of this decreasing salinity trend?
>
> Thanking in advance,
> Abhisek
>
>
>
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-- 
Martin Losch
Alfred Wegener Institute for Polar and Marine Research
Postfach 120161, 27515 Bremerhaven, Germany;
Tel./Fax: ++49(0471)4831-1872/1797