[MITgcm-support] Required guidance!!

[Martin Losch]

Hi Abhisek,

it's usually better to send these types of questions to the support list, so that you get more input (and others may learn from your questions!).

The figure looks very much as if your SSS restoring fields have the wrong values near the coasts and you are restoring to zero after the exf-interpolation maps the fields to the model grid, please check (diagnostics EXFsss or something like that). If your SSS-field is already properly interpolated to the grid, you can use a flag to tell the model that this field needs no interpolation (in EXF_NML_04 climsss_interpMethod = 0,)

Martin

On Feb 19, 2013, at 3:16 PM, Abhisek Chakraborty <abhisek.sac at gmail.com> wrote:

> Respected Dr. Martin,
> 
> Hope you remember me.
> 
> I'm working with MITgcm for simulation of global ocean circulations with a horizontal resolution of 1 deg and 50 vertical layers.
> 
> I have spun up the model for 500 years using climatological fields. After that I am running the model (hot started) using monthly mean fields from NCEP since January 1948. My configurations are very similar to the global ocean example given in the MITgcm verification (only modified for viscosity and other parameters) . The detailed data files are attached here for your kind perusal. I am using the external forcing package. 
> 
> The problem I have noticed is in the salinity field. I found that the salinity values are unrealistically getting reduced near the coastal areas (figure attached) although the deep ocean features are quite realistic and matching well with climatology. I am not using runoff or precipitation as my forcings and at the same time I am restoring model SST and SSS to the climatology following Griffies 2009 (Ocean Model.).
> 
> Can your good self please explain me what might be the possible cause of so much lower salinity near the coasts?
> 
> Thanking in advance,
> Abhisek
> <data><data.exf><data.pkg><EXF_OPTIONS.h><S_01JAN2000_0000.gif>