[MITgcm-support] Negative temperature

[Martin Losch]

Rahele,

the model conserves temperature and salinity, so what goes into a grid cell box also comes out or accumulates. If your forcing is negative near the coasts (e.g. heat flux out of the the ocean), then temperature will decrease, and if there is not enough warm water flowing in, then the temperatures will continue to drop indefinitely (unless you have an ice model). Usually this happens when the grid cells are closed on three sides (and the bottom) that there this no way for a circulation into the grid cell (only diffusion, which is usually to slow) that would balance the heat loss in the cell.

M.

> On 29. Dec 2017, at 12:02, rahele shafiee <rahele_shafiee at yahoo.com> wrote:
> 
> Hello everyone
> 
> I runed my model in an area with net heat flux(qnet), evaporation minus Precipitation(emp), wind stress and temperature data, salinity, current, and tide at open boundaries.
> 
> In the near the land, the temperature and salinity are very small and in some places the temperature becomes negative.
> 
> Is it possible to guide me what did i make wrong?
> 
> Regards Raheleh
> 
> 
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