b.e30_alpha07g.B1850C_LTso.ne30_t232_wgx3.285

Compare this case with issue 284, then inspect user_nl_mom in the linked CESM case directory and sandbox. Review the referenced diagnostics and output to determine whether the configuration reduces Lab Sea freezing; done means the case shows the intended behavior without introducing regressions.

Purpose:

Make it less prone to Lab Sea freezing.

Description:

Same as 284 + reverting MLE_DENSITY_DIFF = 0.02

• add to user_nl_mom

MLE%
USE_CR_GRID = False
CR = 0.005               !  Low value to improve Salinity cycle in Southern Ocean, especially Atlantic DMB
%MLE
MLE_DENSITY_DIFF = 0.02  

INPUTDIR = "/glade/derecho/scratch/gmarques/g.e30_a07g.GW1850MARBL_JRA.TL319_t232_wgx3_hycom1_N75.2025.152/run/INPUT"
MEKE_GEOMETRIC_ALPHA = 0.09
SMAGORINSKY_KH = False
MAXTRUNC = 1.0E6

! Leith+E Settings
TAPER_LEITHY = True
LEITH_BI_CONST = 85.0
LEITHY_CK = 1.0
LEITHY_DEPTH = 1000.0
LEITHY_WIDTH = 500.0

! Background KH
USE_KH_BG_2D = True
KH_BG_2D_FILENAME = "KH_BG_2D.nc"
KH_BG_2D_VARNAME = "KH"

! Resolution scaling:
!! GM & Redi the same
!! Don't apply scaling to Laplacian viscosity, which is the 2D background
RESOLN_SCALED_KH = False
RESOLN_SCALED_KHTH = True  ! Already using, here for clarity
RESOLN_SCALED_KHTR = True  ! Already using, here for clarity
KH_RES_SCALE_COEF = 0.5    ! Tighter around the equator
KH_RES_FN_POWER = 6        ! Already using, here for clarity
VISC_RES_SCALE_COEF = 0.5  ! Used for KHTR
VISC_RES_FN_POWER = 6      ! Used for KHTR
INTERPOLATE_RES_FN = True  ! Only computes resolution fn once, then interpolates

THICKNESS_CONFIG = thickness_file
VELOCITY_CONFIG = file
TS_CONFIG = file

INIT_LAYERS_FROM_Z_FILE = False

THICKNESS_FILE = "/glade/derecho/scratch/gmarques/archive/g.e30_a07g.GW_JRA.TL319_t232_wgx3_hycom1_N75.2025.158/rest/0011-01-01-00000/g.e30_a07g.GW_JRA.TL319_t232_wgx3_hycom1_N75.2025.158.mom6.r.0011-01-01-00000.nc"

TS_FILE = "/glade/derecho/scratch/gmarques/archive/g.e30_a07g.GW_JRA.TL319_t232_wgx3_hycom1_N75.2025.158/rest/0011-01-01-00000/g.e30_a07g.GW_JRA.TL319_t232_wgx3_hycom1_N75.2025.158.mom6.r.0011-01-01-00000.nc"
VELOCITY_FILE = "/glade/derecho/scratch/gmarques/archive/g.e30_a07g.GW_JRA.TL319_t232_wgx3_hycom1_N75.2025.158/rest/0011-01-01-00000/g.e30_a07g.GW_JRA.TL319_t232_wgx3_hycom1_N75.2025.158.mom6.r.0011-01-01-00000.nc"

TEMP_IC_VAR = "Temp"
SALT_IC_VAR = "Salt"

Case directory:

• Locally (if still available):
  /glade/campaign/cesm/cesmdata/cseg/runs/cesm2_0/b.e30_alpha07g.B1850C_LTso.ne30_t232_wgx3.285

• On github:
  https://github.com/NCAR/cesm_dev/tree/b.e30_alpha07g.B1850C_LTso.ne30_t232_wgx3.285

Sandbox:

• Locally (if still available): /glade/work/gmarques/cesm.sandboxes/cesm3_0_alpha07g_ww3_diags

• On github: https://github.com/ESCOMP/cesm/tree/cesm3_0_alpha07g_ww3_diags

Diagnostics:

• Diags (if available):
  https://webext.cgd.ucar.edu/BLT1850/b.e30_alpha07g.B1850C_LTso.ne30_t232_wgx3.285/

Output:

• Raw output on derecho (if still available): /glade/derecho/scratch/gmarques/archive/b.e30_alpha07g.B1850C_LTso.ne30_t232_wgx3.285/
• CAM Climos: /glade/campaign/cgd/amp/amwg/climo/b.e30_alpha07g.B1850C_LTso.ne30_t232_wgx3.285

Contacts:
@cecilehannay @dlawrenncar @adamrher @PeterHjortLauritzen @JulioTBacmeister @swrneale @slevis-lmwg @wwieder @olyson @gustavo-marques @iangrooms @fobryan3 @klindsay28 @dabail10 @duvivier @tilmes @mbramberger @dmleung

Extra details: