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[0.25deg] Change MOM6 tracer timestep #76

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[0.25deg] Change MOM6 tracer timestep #76

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41c6e75
Change the MOM6 tracer timestep within the MOM module so that the cur…
minghangli-uni Jun 21, 2024
f199607
diabatic_first needs to be turned off if cpl_dt differs from ocn ther…
minghangli-uni Jul 5, 2024
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12 changes: 7 additions & 5 deletions MOM_input
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Original file line number Diff line number Diff line change
@@ -1,9 +1,6 @@
! This file was written by the model and records the non-default parameters used at run-time.

! === module MOM ===
DIABATIC_FIRST = True ! [Boolean] default = False
! If true, apply diabatic and thermodynamic processes, including buoyancy
! forcing and mass gain or loss, before stepping the dynamics forward.
USE_REGRIDDING = True ! [Boolean] default = False
! If True, use the ALE algorithm (regridding/remapping). If False, use the
! layered isopycnal algorithm.
Expand All @@ -16,17 +13,22 @@ DT = 1350.0 ! [s]
! The (baroclinic) dynamics time step. The time-step that is actually used will
! be an integer fraction of the forcing time-step (DT_FORCING in ocean-only mode
! or the coupling timestep in coupled mode.)
DT_THERM = 1350.0 ! [s] default = 1800.0
DT_THERM = 8100.0 ! [s] default = 1800.0
! The thermodynamic and tracer advection time step. Ideally DT_THERM should be
! an integer multiple of DT and less than the forcing or coupling time-step,
! unless THERMO_SPANS_COUPLING is true, in which case DT_THERM can be an integer
! multiple of the coupling timestep. By default DT_THERM is set to DT.
THERMO_SPANS_COUPLING = True ! [Boolean] default = False
! If true, the MOM will take thermodynamic and tracer timesteps that can be
! longer than the coupling timestep. The actual thermodynamic timestep that is
! used in this case is the largest integer multiple of the coupling timestep
! that is less than or equal to DT_THERM.
HFREEZE = 10.0 ! [m] default = -1.0
! If HFREEZE > 0, melt potential will be computed. The actual depth over which
! melt potential is computed will be min(HFREEZE, OBLD), where OBLD is the
! boundary layer depth. If HFREEZE <= 0 (default), melt potential will not be
! computed.
DTBT_RESET_PERIOD = 0.0 ! [s] default = 3600.0
DTBT_RESET_PERIOD = 8100.0 ! [s] default = 1350.0 !default is set by DT_THERM
! The period between recalculations of DTBT (if DTBT <= 0). If DTBT_RESET_PERIOD
! is negative, DTBT is set based only on information available at
! initialization. If 0, DTBT will be set every dynamics time step. The default
Expand Down
8 changes: 4 additions & 4 deletions docs/MOM_parameter_doc.all
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Expand Up @@ -11,7 +11,7 @@ ENABLE_THERMODYNAMICS = True ! [Boolean] default = True
USE_EOS = True ! [Boolean] default = True
! If true, density is calculated from temperature and salinity with an equation
! of state. If USE_EOS is true, ENABLE_THERMODYNAMICS must be true as well.
DIABATIC_FIRST = True ! [Boolean] default = False
DIABATIC_FIRST = False ! [Boolean] default = False
! If true, apply diabatic and thermodynamic processes, including buoyancy
! forcing and mass gain or loss, before stepping the dynamics forward.
USE_CONTEMP_ABSSAL = False ! [Boolean] default = False
Expand Down Expand Up @@ -64,12 +64,12 @@ DT = 1350.0 ! [s]
! The (baroclinic) dynamics time step. The time-step that is actually used will
! be an integer fraction of the forcing time-step (DT_FORCING in ocean-only mode
! or the coupling timestep in coupled mode.)
DT_THERM = 1350.0 ! [s] default = 1350.0
DT_THERM = 8100.0 ! [s] default = 1350.0
! The thermodynamic and tracer advection time step. Ideally DT_THERM should be
! an integer multiple of DT and less than the forcing or coupling time-step,
! unless THERMO_SPANS_COUPLING is true, in which case DT_THERM can be an integer
! multiple of the coupling timestep. By default DT_THERM is set to DT.
THERMO_SPANS_COUPLING = False ! [Boolean] default = False
THERMO_SPANS_COUPLING = True ! [Boolean] default = False
! If true, the MOM will take thermodynamic and tracer timesteps that can be
! longer than the coupling timestep. The actual thermodynamic timestep that is
! used in this case is the largest integer multiple of the coupling timestep
Expand All @@ -90,7 +90,7 @@ HFREEZE = 10.0 ! [m] default = -1.0
INTERPOLATE_P_SURF = False ! [Boolean] default = False
! If true, linearly interpolate the surface pressure over the coupling time
! step, using the specified value at the end of the step.
DTBT_RESET_PERIOD = 0.0 ! [s] default = 1350.0
DTBT_RESET_PERIOD = 8100.0 ! [s] default = 1350.0 !default is set by DT_THERM
! The period between recalculations of DTBT (if DTBT <= 0). If DTBT_RESET_PERIOD
! is negative, DTBT is set based only on information available at
! initialization. If 0, DTBT will be set every dynamics time step. The default
Expand Down