Update parameter settings for alpha08e

[iangrooms]

Several updates for alpha08e:

• Update the default resolution scaling function settings so that the viscous coefficient is not scaled and the GM and Redi coefficients are scaled the same way. These are the settings from coupled case 268, which is the latest baseline:

  • RESOLN_SCALED_KH = False This changes the default so that the Laplacian lateral viscosity coefficient is not scaled away using the resolution function.
  • KH_RES_SCALE_COEF = 0.5 This the default value so that the resolution function is applied to GM over a smaller geographical area.
  • VISC_RES_SCALE_COEF = 0.5 This the default value so that the resolution function is applied to Redi over a smaller geographical area.
  • INTERPOLATE_RES_FN = True Since we're using the same resolution function for GM and Redi, this computes the resolution function only once.

• MEKE_GEOMETRIC_ALPHA = 0.07. Reverts the change that appeared in alpha07g; updates it to the current-best value from case 287.

• SMAGORINSKY_KH = False and MAXTRUNC = 1.0E6 Turn off Smag and allow truncations.

• Turn on Leith+E backscatter:

  • Set LEITHY_CK = 1.0 so that we are using Leith+E backscatter by default.
  • TAPER_LEITHY = True
  • LEITH_BI_CONST = 85.0
  • LEITHY_DEPTH = 1000.0
  • LEITHY_WIDTH = 500.0
  • USE_KH_BG_2D = True, KH_BG_2D_VARNAME = "KH", KH_BG_2D_FILENAME = "KH_BG_2D.nc" The file can be found at /glade/u/home/igrooms/jupyter_notebooks/KH_BG_2D.nc. It was created using /glade/u/home/igrooms/jupyter_notebooks/KH_BG_2D.ipynb. The file will need to be copied to the input directory.
  • Add BS_coeff_h to the diag table in the native output file. This is the backscatter coefficient.

• Maybe update so that Bodner is no longer masked in the Lab Sea.

• Set BBL_EFFIC = 0.01 following CM4X. We tried this and it exacerbated the decrease in ACC transport, so we will stick to the default. There is some evidence that it affects Denmark Strait overflow, but we do not have clear evidence that it's an improvement.