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use DT_THERM=6*DT and DIABATIC_FIRST = False - COSIMA/access-om3#138
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Revert to 1mo run
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@aekiss @anton-seaice
aekiss authored and anton-seaice committed Aug 21, 2024
1 parent bf90953 commit db244fa
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106 changes: 40 additions & 66 deletions MOM_input
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@@ -1,66 +1,40 @@
! This input file provides the adjustable run-time parameters for version 6 of the Modular Ocean Model (MOM6).

! === module MOM ===
DT = 1800.0
! "[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 = 3600.0
! "[s] default = 3600.0
! 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.
! By default DT_THERM is set to DT.
! The minimum amount of time in seconds between
! calculations of depth-space diagnostics. Making this
! larger than DT_THERM reduces the performance penalty
! of regridding to depth online."

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."

C_P = 3992.0
! "[J kg-1 K-1] default = 3991.86795711963
! The heat capacity of sea water, approximated as a
! constant. This is only used if ENABLE_THERMODYNAMICS is
! true. The default value is from the TEOS-10 definition
! of conservative temperature."

USE_REGRIDDING = True
! "[Boolean] default = False
! If True, use the ALE algorithm (regridding/remapping).
! If False, use the layered isopycnal algorithm."

THICKNESSDIFFUSE = True
! "[Boolean] default = False
! If true, interfaces or isopycnal surfaces are diffused,
! depending on the value of FULL_THICKNESSDIFFUSE."

THICKNESSDIFFUSE_FIRST = True
! "[Boolean] default = False
! If true, do thickness diffusion before dynamics.
! This is only used if THICKNESSDIFFUSE is true."

DTBT_RESET_PERIOD = 0.0
! "[s] default = 7200.0
! 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
! is set by DT_THERM. This is only used if SPLIT is true."

FRAZIL = True
! "[Boolean] default = False
! If true, water freezes if it gets too cold, and the
! the accumulated heat deficit is returned in the
! surface state. FRAZIL is only used if
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_REGRIDDING = True ! [Boolean] default = False
! If True, use the ALE algorithm (regridding/remapping). If False, use the
! layered isopycnal algorithm.
THICKNESSDIFFUSE = True ! [Boolean] default = False
! If true, isopycnal surfaces are diffused with a Laplacian coefficient of KHTH.
THICKNESSDIFFUSE_FIRST = True ! [Boolean] default = False
! If true, do thickness diffusion or interface height smoothing before dynamics.
! This is only used if THICKNESSDIFFUSE or APPLY_INTERFACE_FILTER is true.
DT = 1800.0 ! [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 = 10800.0 ! [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
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 = 10800.0 ! [s] default = 3600.0
! 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
! is set by DT_THERM. This is only used if SPLIT is true.
FRAZIL = True ! [Boolean] default = False
! If true, water freezes if it gets too cold, and the accumulated heat deficit
! is returned in the surface state. FRAZIL is only used if
! ENABLE_THERMODYNAMICS is true.
! If true, apply geothermal heating."

Expand All @@ -74,7 +48,12 @@ BOUND_SALINITY = True
! If true, limit salinity to being positive. (The sea-ice
! model may ask for more salt than is available and
! drive the salinity negative otherwise.)"

C_P = 3992.0
! "[J kg-1 K-1] default = 3991.86795711963
! The heat capacity of sea water, approximated as a
! constant. This is only used if ENABLE_THERMODYNAMICS is
! true. The default value is from the TEOS-10 definition
! of conservative temperature."
USE_PSURF_IN_EOS = True
! "[Boolean] default = True
! If true, always include the surface pressure contributions in equation of
Expand Down Expand Up @@ -406,11 +385,6 @@ USE_LEGACY_DIABATIC_DRIVER = False
! This is temporary and is needed avoid change in answers."

! === module MOM_ocean_model_nuopc ===
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."

OCEAN_SURFACE_STAGGER = A
! "default = 'C'
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2 changes: 1 addition & 1 deletion nuopc.runconfig
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Expand Up @@ -287,7 +287,7 @@ CLOCK_attributes::
history_ymd = -999
ice_cpl_dt = 99999 #not used
lnd_cpl_dt = 99999 #not used
ocn_cpl_dt = 3600
ocn_cpl_dt = 1800 #ignored (coupling timestep set by nuopc.runseq) unless stop_option is nsteps
restart_n = 1
restart_option = ndays
restart_ymd = -999
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2 changes: 1 addition & 1 deletion nuopc.runseq
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@@ -1,5 +1,5 @@
runSeq::
@3600
@1800
MED med_phases_aofluxes_run
MED med_phases_prep_ocn_accum
MED med_phases_ocnalb_run
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