[MITgcm-support] Model loosing salt

[Abhisek Chakraborty]

Dear Martin,
Thanks for your prompt response. Surely the atmospheric forcing is adding
up non-zero freshwater flux. I have found the mean salinity is also
decreasing. I am using OBCS_BALANCE with a non-zero sponge layer. I have
tried with and without Orlanski OBC at my southern bounday but the results
are similar. Is it always required to modify the code for balancing the
tracers for a regional configuration of the model despite of using the
standard OBCS package?
With best regards,
Abhisek
On 26-Apr-2016 4:54 PM, "Martin Losch" <Martin.Losch at awi.de> wrote:

> 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
>
>
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