[MITgcm-support] GM Visbeck
Olivier Arzel
Olivier.Arzel at univ-brest.fr
Thu Mar 24 06:22:01 EDT 2016
Hi
I am doing some quick tests to see how the model stores quantities
associated with the GM parameterization (with GM_AdvForm=.TRUE.)
When I run the model with constant Kgm and zero Redi diffusion, the
diffusive tracers fluxes are indeed zero (bolus transport and eulerian
mean combined to
form the residual mean). Here is my data.gmredi for this case.
&GM_PARM01
GM_AdvForm = .TRUE.,
GM_AdvSeparate = .FALSE.,
GM_background_K = 1000.0,
GM_isopycK = 0.0,
GM_taper_scheme = 'gkw91',
GM_maxSlope = 1.e-2,
GM_Kmin_horiz = 0.,
GM_Scrit = 4.e-3,
GM_Sd = 1.e-3,
# GM_Visbeck_alpha = 0.,
# GM_Visbeck_length = 2.e+5,
# GM_Visbeck_depth = 1.e+3,
# GM_Visbeck_maxval_K= 2.5e+3,
&
However when I run the same experiment but using a variable Kgm
(Visbeck), the diffusive terms become non-zero. I do not see why this
should be the case.
Here is the data.gmredi that I use. (I also use in all experiments
implicitDiffusion=.TRUE.)
&GM_PARM01
GM_AdvForm = .TRUE.,
GM_AdvSeparate = .FALSE.,
GM_background_K = 0.0,
GM_isopycK = 0.0,
GM_taper_scheme = 'gkw91',
GM_maxSlope = 1.e-2,
GM_Kmin_horiz = 0.,
GM_Scrit = 4.e-3,
GM_Sd = 1.e-3,
GM_Visbeck_alpha = 0.07,
GM_Visbeck_length = 5.e+4,
GM_Visbeck_depth = 2.e+3,
GM_Visbeck_maxval_K= 1.e+3,
&
Any help would be greatly appreciated
Thanks
Olivier
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