[MITgcm-support] help-noise with the internal wave simulation

[JIATONG]

Dear MITgcm,

    First of all I want to wish everyone a happy new year. 
    And here is my question. I am trying to model nonliear internal waves with two open boundaries without free surface (rigid lid) in 2D 
in nonHydrostatic. In the model setup, I input the barotropic tide at west and east boundaries over the bottom topography, and want the 
barotropic tide can evolve into nonlinear internal wave(internal solitary wave). dx is set to 50m and dz is set to 5m. dt is 5s. However, 
the T of the model output is filled with noises and I can not identify the wave signal(its lenght scale is about several hundred meters). 
I've tried to set various dx, dz and dt steps, but  without positive result. And I also tried the Laplacian viscosity coefficient changing 
from 1e-5 to 1e-1, some very small noise have been removed, but there are still some large noises. 
    I put the pictures with contour T plot of the 72 h 's modeling result and the 'data' set in attached. The red line in T.jpg is the bottom topography.
    Could you tell me how should I modify my model setup for  clearing the model? 
    Best regards.


JIATONG
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