-
Notifications
You must be signed in to change notification settings - Fork 3
/
Copy pathSIS_parameter_doc.all
610 lines (588 loc) · 45.5 KB
/
SIS_parameter_doc.all
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
! This file was written by the model and records all non-layout or debugging parameters used at run-time.
! === module ice_model ===
SPECIFIED_ICE = False ! [Boolean] default = False
! If true, the ice is specified and there is no dynamics.
CGRID_ICE_DYNAMICS = True ! [Boolean] default = True
! If true, use a C-grid discretization of the sea-ice dynamics; if false use a
! B-grid discretization.
USE_SLAB_ICE = False ! [Boolean] default = False
! If true, use the very old slab-style ice.
SINGLE_ICE_STATE_TYPE = True ! [Boolean] default = True
! If true, the fast and slow portions of the ice use a single common
! ice_state_type. Otherwise they point to different ice_state_types that need
! to be explicitly copied back and forth.
EULERIAN_TSURF = True ! [Boolean] default = True
! If true, use previous calculations of the ice-top surface skin temperature for
! tsurf at the start of atmospheric time stepping, including interpolating
! between tsurf values from other categories in the same location.
ICE_OCEAN_STRESS_STAGGER = "C" ! default = "C"
! A case-insensitive character string to indicate the staggering of the stress
! field on the ocean that is returned to the coupler. Valid values include 'A',
! 'B', or 'C', with a default that follows the value of CGRID_ICE_DYNAMICS.
RHO_OCEAN = 1030.0 ! [kg m-3] default = 1030.0
! The nominal density of sea water as used by SIS.
RHO_ICE = 905.0 ! [kg m-3] default = 905.0
! The nominal density of sea ice as used by SIS.
RHO_SNOW = 330.0 ! [kg m-3] default = 330.0
! The nominal density of snow as used by SIS.
G_EARTH = 9.8 ! [m s-2] default = 9.8
! The gravitational acceleration of the Earth.
MOMENTUM_ROUGH_ICE = 1.0E-04 ! [m] default = 1.0E-04
! The default momentum roughness length scale for the ocean.
HEAT_ROUGH_ICE = 1.0E-04 ! [m] default = 1.0E-04
! The default roughness length scale for the turbulent transfer of heat into the
! ocean.
CONSTANT_COSZEN_IC = -1.0 ! [nondim] default = -1.0
! A constant value to use to initialize the cosine of the solar zenith angle for
! the first radiation step, or a negative number to use the current time and
! astronomy.
DT_RADIATION = 3600.0 ! [s] default = 3600.0
! The time step with which the shortwave radiation and fields like albedos are
! updated. Currently this is only used to initialize albedos when there is no
! restart file.
ICE_KMELT = 240.0 ! [W m-2 K-1] default = 240.0
! A constant giving the proportionality of the ocean/ice base heat flux to the
! tempature difference, given by the product of the heat capacity per unit
! volume of sea water times a molecular diffusive piston velocity.
ICE_BOUNDS_CHECK = True ! [Boolean] default = True
! If true, periodically check the values of ice and snow temperatures and
! thicknesses to ensure that they are sensible, and issue warnings if they are
! not. This does not change answers, but can increase model run time.
FIRST_DIRECTION = 0 ! default = 0
! An integer that indicates which direction goes first in parts of the code that
! use directionally split updates, with even numbers (or 0) used for x- first
! and odd numbers used for y-first.
ICE_SEES_ATMOS_WINDS = True ! [Boolean] default = True
! If true, the sea ice is being given wind stresses with the atmospheric sign
! convention, and need to have their sign changed.
APPLY_SLP_TO_OCEAN = False ! [Boolean] default = False
! If true, apply the atmospheric sea level pressure to the ocean.
PASS_STRESS_MAG_TO_OCEAN = False ! [Boolean] default = False
! If true, provide the time and area weighted mean magnitude of the stresses on
! the ocean to the ocean.
DO_ICEBERGS = False ! [Boolean] default = False
! If true, call the iceberg module.
ADD_DIURNAL_SW = False ! [Boolean] default = False
! If true, add a synthetic diurnal cycle to the shortwave radiation.
DO_SUN_ANGLE_FOR_ALB = False ! [Boolean] default = False
! If true, find the sun angle for calculating the ocean albedo within the sea
! ice model.
DO_RIDGING = True ! [Boolean] default = False
! If true, call the ridging routines.
RESTARTFILE = "ice_model.res.nc" ! default = "ice_model.res.nc"
! The name of the restart file.
FAST_ICE_RESTARTFILE = "ice_model.res.nc" ! default = "ice_model.res.nc"
! The name of the restart file for those elements of the the sea ice that are
! handled by the fast ice PEs.
APPLY_MASKS_AFTER_RESTART = True ! [Boolean] default = True
! If true, applies masks to mH_ice,mH_snow and part_size after a restart.
WRITE_GEOM = 1 ! default = 1
! If =0, never write the geometry and vertical grid files. If =1, write the
! geometry and vertical grid files only for a new simulation. If =2, always
! write the geometry and vertical grid files. Other values are invalid.
INTERPOLATE_FLUXES = True ! [Boolean] default = True
! If true, interpolate a linearized version of the fast fluxes into arealess
! categories.
REDO_FAST_ICE_UPDATE = False ! [Boolean] default = False
! If true, recalculate the thermal updates from the fast dynamics on the slowly
! evolving ice state, rather than copying over the slow ice state to the fast
! ice state.
READ_HLIM_VALS = True ! [Boolean] default = False
! If true, read the lower limits on the ice thicknesscategories.
NCAT_ICE = 5 ! [nondim] default = 5
! The number of sea ice thickness categories.
NK_ICE = 4 ! [nondim] default = 4
! The number of layers within the sea ice.
NK_SNOW = 1 ! [nondim] default = 1
! The number of layers within the snow atop the sea ice.
MIN_OCEAN_PARTSIZE = 0.0 ! [nondim] default = 0.0
! The minimum value for the fractional open-ocean area. This can be 0, but for
! some purposes it may be useful to set this to a miniscule value (like 1e-40)
! that will be lost to roundoff during any sums so that the open ocean fluxes
! can be used in with new categories.
HLIM_VALS = "1.0e-10, 0.1, 0.3, 0.7, 1.1, 1.5, 2.0, 2.5, 3.5, 4.5" ! default = "1.0e-10, 0.1, 0.3, 0.7, 1.1, 1.5, 2.0, 2.5"
! This sets the list of lower limits on the ice thickness categories.
! === module MOM_domains ===
REENTRANT_X = False ! [Boolean] default = True
! If true, the domain is zonally reentrant.
REENTRANT_Y = False ! [Boolean] default = False
! If true, the domain is meridionally reentrant.
TRIPOLAR_N = False ! [Boolean] default = False
! Use tripolar connectivity at the northern edge of the domain. With
! TRIPOLAR_N, NIGLOBAL must be even.
NIGLOBAL = 237 !
! The total number of thickness grid points in the x-direction in the physical
! domain. With STATIC_MEMORY_ this is set in SIS2_memory.h at compile time.
NJGLOBAL = 277 !
! The total number of thickness grid points in the y-direction in the physical
! domain. With STATIC_MEMORY_ this is set in SIS2_memory.h at compile time.
NIHALO = 4 ! default = 4
! The number of halo points on each side in the x-direction. How this is set
! varies with the calling component and static or dynamic memory configuration.
NJHALO = 4 ! default = 4
! The number of halo points on each side in the y-direction. How this is set
! varies with the calling component and static or dynamic memory configuration.
! === module MOM_hor_index ===
! Sets the horizontal array index types.
! === module SIS_restart ===
PARALLEL_RESTARTFILES = False ! [Boolean] default = False
! If true, each processor writes its own restart file, otherwise a single
! restart file is generated
MAX_FIELDS = 100 ! default = 100
! The maximum number of restart fields that can be used.
RESTART_CHECKSUMS_REQUIRED = False ! [Boolean] default = True
! If true, require the restart checksums to match and error out otherwise. Users
! may want to avoid this comparison if for example the restarts are made from a
! run with a different mask_table than the current run, in which case the
! checksums will not match.
! === module SIS_initialize_fixed ===
INPUTDIR = "INPUT" ! default = "."
! The directory in which input files are found.
! === module MOM_grid_init ===
GRID_CONFIG = "mosaic" !
! A character string that determines the method for defining the horizontal
! grid. Current options are:
! mosaic - read the grid from a mosaic (supergrid)
! file set by GRID_FILE.
! cartesian - use a (flat) Cartesian grid.
! spherical - use a simple spherical grid.
! mercator - use a Mercator spherical grid.
GRID_FILE = "ocean_hgrid.nc" !
! Name of the file from which to read horizontal grid data.
USE_TRIPOLAR_GEOLONB_BUG = False ! [Boolean] default = False
! If true, use older code that incorrectly sets the longitude in some points
! along the tripolar fold to be off by 360 degrees.
RAD_EARTH = 6.378E+06 ! [m] default = 6.378E+06
! The radius of the Earth.
TOPO_CONFIG = "file" ! default = "file"
! This specifies how bathymetry is specified:
! file - read bathymetric information from the file
! specified by (TOPO_FILE).
! flat - flat bottom set to MAXIMUM_DEPTH.
! bowl - an analytically specified bowl-shaped basin
! ranging between MAXIMUM_DEPTH and MINIMUM_DEPTH.
! spoon - a similar shape to 'bowl', but with a vertical
! wall at the southern face.
! halfpipe - a zonally uniform channel with a half-sine
! profile in the meridional direction.
TOPO_FILE = "ocean_topog.nc" ! default = "topog.nc"
! The file from which the bathymetry is read.
TOPO_VARNAME = "depth" ! default = "depth"
! The name of the bathymetry variable in TOPO_FILE.
TOPO_EDITS_FILE = "" ! default = ""
! The file from which to read a list of i,j,z topography overrides.
ALLOW_LANDMASK_CHANGES = False ! [Boolean] default = False
! If true, allow topography overrides to change land mask.
MINIMUM_DEPTH = 5.0 ! [m] default = 0.0
! If MASKING_DEPTH is unspecified, then anything shallower than MINIMUM_DEPTH is
! assumed to be land and all fluxes are masked out. If MASKING_DEPTH is
! specified, then all depths shallower than MINIMUM_DEPTH but deeper than
! MASKING_DEPTH are rounded to MINIMUM_DEPTH.
MASKING_DEPTH = 1.0 ! [m] default = -9999.0
! The depth below which to mask points as land points, for which all fluxes are
! zeroed out. MASKING_DEPTH is ignored if it has the special default value.
MAXIMUM_DEPTH = 6500.0 ! [m]
! The maximum depth of the ocean.
! === module SIS_open_boundary ===
! Controls where open boundaries are located, what kind of boundary condition to impose, and what data to apply,
! if any.
OBC_NUMBER_OF_SEGMENTS = 0 ! default = 0
! The number of open boundary segments.
CHANNEL_CONFIG = "none" ! default = "none"
! A parameter that determines which set of channels are restricted to specific
! widths. Options are:
! none - All channels have the grid width.
! global_1deg - Sets 16 specific channels appropriate
! for a 1-degree model, as used in CM2G.
! list - Read the channel locations and widths from a
! text file, like MOM_channel_list in the MOM_SIS
! test case.
! file - Read open face widths everywhere from a
! NetCDF file on the model grid.
ROTATION = "2omegasinlat" ! default = "2omegasinlat"
! This specifies how the Coriolis parameter is specified:
! 2omegasinlat - Use twice the planetary rotation rate
! times the sine of latitude.
! betaplane - Use a beta-plane or f-plane.
! USER - call a user modified routine.
OMEGA = 7.292E-05 ! [s-1] default = 7.2921E-05
! The rotation rate of the earth.
GRID_ROTATION_ANGLE_BUGS = False ! [Boolean] default = False
! If true, use an older algorithm to calculate the sine and cosines needed
! rotate between grid-oriented directions and true north and east. Differences
! arise at the tripolar fold.
! === module hor_grid ===
! Parameters providing information about the lateral grid.
! === module MOM_hor_index ===
! Sets the horizontal array index types.
SIS_AVAILABLE_DIAGS_FILE = "SIS.available_diags" ! default = "SIS.available_diags"
! A file into which to write a list of all available sea ice diagnostics that
! can be included in a diag_table.
! === module SIS2_ice_thm (thermo) ===
! This sub-module calculates ice thermodynamic quantities.
LATENT_HEAT_FUSION = 3.34E+05 ! [J kg-1] default = 3.34E+05
! The latent heat of fusion as used by SIS.
LATENT_HEAT_VAPOR = 2.5E+06 ! [J kg-1] default = 2.5E+06
! The latent heat of vaporization of water at 0C as used by SIS.
CP_ICE = 2100.0 ! [J kg-1 K-1] default = 2100.0
! The heat capacity of fresh ice, approximated as a constant.
CP_SEAWATER = 4200.0 ! [J kg-1 K-1] default = 4200.0
! The heat capacity of sea water, approximated as a constant.
CP_BRINE = 4200.0 ! [J kg-1 K-1] default = 4200.0
! The heat capacity of water in brine pockets within the sea-ice, approximated
! as a constant. CP_BRINE and CP_SEAWATER should be equal, but for
! computational convenience CP_BRINE can be set equal to CP_ICE.
DTFREEZE_DS = -0.054 ! [deg C PSU-1] default = -0.054
! The derivative of the freezing temperature with salinity.
ENTHALPY_LIQUID_0 = 0.0 ! [J kg-1] default = 0.0
! The enthalpy of liquid fresh water at 0 C. The solutions should be physically
! consistent when this is adjusted, because only the relative value is of
! physical meaning, but roundoff errors can change the solution.
SUBLIMATION_BUG = False ! [Boolean] default = False
! If true use an older calculation that omits the latent heat of fusion from the
! latent heat of sublimation. This variable should be obsoleted as soon as
! possible.
! === module SIS_tracer_registry ===
! === module SIS_tracer_flow_control ===
USE_ICE_AGE_TRACER = False ! [Boolean] default = False
! If true, use the concentration based age tracer package.
SIS_FAST_AVAILABLE_DIAGS_FILE = "SIS_fast.available_diags" ! default = "SIS_fast.available_diags"
! A file into which to write a list of all available sea ice diagnostics that
! can be included in a diag_table.
CONCENTRATION_INIT_CONFIG = "latitudes" ! default = "data_override"
! A string that determines how the initial total sea ice concentration is
! initialized for a new run:
! file - read sea ice concentrations from a specified file
! data_override - use the data_override capability or zero everywhere
! zero - there is no sea ice anywhere
! latitudes - initial sea ice concentration is a function of latitude.
ICE_THICKNESS_INIT_CONFIG = "uniform" ! default = "data_override"
! A string that determines how the initial sea ice thickness is initialized for
! a new run:
! file - read sea ice thickesses from a specified file
! data_override - use the data_override capability or zero everywhere
! uniform - sea ice has uniform thickness where the concentration is
! nonzero.
SNOW_THICKNESS_INIT_CONFIG = "data_override" ! default = "data_override"
! A string that determines how the initial total snow thickness is initialized
! for a new run:
! file - read sea ice concentrations from a specified file
! data_override - use the data_override capability or zero everywhere
! uniform - snow has uniform thickness where the concentration is nonzero.
ARCTIC_ICE_EDGE_IC = 72.0 ! [degrees of latitude] default = 91.0
! The southern latitude of Arctic ice in an initial condition.
ANTARCTIC_ICE_EDGE_IC = -91.0 ! [degrees of latitude] default = -91.0
! The northern latitude of Antarctic ice in an initial condition.
ICE_INIT_MASS = 900.0 ! [kg m-2] default = 0.0
! A uniform initial sea ice mass per unit area where there is sea ice.
ICE_SALINITY_INIT_CONFIG = "uniform" ! default = "uniform"
! A string that determines how the sea ice salinity is initialized for a new
! run:
! uniform - Use a constant ice salinity initial condition
! file - Read sea ice salinities from a specified file
! data_override - use the data_override capability or zero everywhere.
ICE_ENTHALPY_INIT_CONFIG = "uniform_temp" ! default = "uniform_temp"
! A string that determines how the sea ice enthalpy is initialized for a new
! run:
! uniform_temp - Use a constant ice temperature initial condition
! relative_temp - Use an ice temperature initial condition with a
! specified depression below the bulk ice freezing point
! file - Read sea ice temperatures or enthalpies from a specified file
! data_override - use the data_override capability or freezing enthalpy
! everywhere.
SNOW_ENTHALPY_INIT_CONFIG = "uniform_temp" ! default = "uniform_temp"
! A string that determines how the snow enthalpy is initialized for a new run:
! uniform_temp - Use a constant ice temperature initial condition
! relative_temp - Use an ice temperature initial condition with a
! specified depression below the bulk ice freezing point
! file - Read sea ice temperatures or enthalpies from a specified file
! data_override - use the data_override capability or freezing enthalpy
! everywhere.
ICE_SALINITY_IC = 4.0 ! [g kg-1] default = 0.0
! The uniform sea ice salinity used for the initial condition
ICE_TEMPERATURE_IC = -4.0 ! [degC] default = -4.0
! The uniform sea ice and snow temperature used for the initial condition
! === module SIS_slow_thermo ===
! This module calculates the slow evolution of the ice mass, heat, and salt budgets.
ICE_BULK_SALINITY = 0.0 ! [g/kg] default = 4.0
! The fixed bulk salinity of sea ice.
ICE_RELATIVE_SALINITY = 0.1 ! [nondim] default = 0.0
! The initial salinity of sea ice as a fraction of the salinity of the seawater
! from which it formed.
SIS2_FILLING_FRAZIL = True ! [Boolean] default = True
! If true, apply frazil to fill as many categories as possible to fill in a
! uniform (minimum) amount of ice in all the thinnest categories. Otherwise the
! frazil is always assigned to a single category.
FILLING_FRAZIL_TIMESCALE = 0.0 ! [s] default = 0.0
! A timescale with which the filling frazil causes the thinest cells to attain
! similar thicknesses, or a negative number to apply the frazil flux uniformly.
APPLY_ICE_LIMIT = False ! [Boolean] default = False
! If true, restore the sea ice state toward climatology.
DO_ICE_RESTORE = False ! [Boolean] default = False
! If true, restore the sea ice state toward climatology.
NUDGE_SEA_ICE = False ! [Boolean] default = False
! If true, constrain the sea ice concentrations using observations.
TRANSMUTE_SEA_ICE = False ! [Boolean] default = False
! If true, allow ice to be transmuted directly into seawater with a spatially
! varying rate as a form of outflow open boundary condition.
DO_BRINE_PLUME = False ! [Boolean] default = False
! If true, split heat and salt fluxes to the ocean into brine plumes and other.
! === module SIS2_ice_thm (updates) ===
! This sub-module does updates of the sea-ice due to thermodynamic changes.
SNOW_CONDUCTIVITY = 0.31 ! [W m-1 K-1] default = 0.31
! The conductivity of heat in snow.
ICE_CONDUCTIVITY = 2.03 ! [W m-1 K-1] default = 2.03
! The conductivity of heat in ice.
MIN_H_FOR_TEMP_CALC = 0.01 ! [m] default = 0.0
! The minimum ice thickness at which to do temperature calculations.
DO_POND = False ! [Boolean] default = False
! If true, calculate melt ponds and use them for shortwave radiation
! calculation.
TDRAIN = -0.8 ! [degC] default = -0.8
! Melt ponds drain to sea level when ice average temp. exceeds TDRAIN (stand-in
! for mushy layer thermo)
R_MIN_POND = 0.15 ! [nondim] default = 0.15
! Minimum retention rate of surface water sources in melt pond (retention scales
! linearly with ice cover)
R_MAX_POND = 0.9 ! [nondim] default = 0.9
! Maximum retention rate of surface water sources in melt pond (retention scales
! linearly with ice cover)
MIN_POND_FRAC = 0.2 ! [nondim] default = 0.2
! Minimum melt pond cover (by ponds at sea level) pond drains to this when ice
! is porous.
MAX_POND_FRAC = 0.5 ! [nondim] default = 0.5
! Maximum melt pond cover - associated with pond volume that suppresses ice top
! to waterline
ICE_TEMP_RANGE_ESTIMATE = 40.0 ! [degC] default = 40.0
! An estimate of the range of snow and ice temperatures that is used to evaluate
! whether an explicit diffusive form of the heat fluxes or an inversion based on
! the layer heat budget is more likely to be more accurate. Setting this to 0
! causes the explicit diffusive form. to always be used.
! === module SIS_dyn_trans ===
! This module updates the ice momentum and does ice transport.
DT_ICE_DYNAMICS = 1200.0 ! [seconds] default = -1.0
! The time step used for the slow ice dynamics, including stepping the
! continuity equation and interactions between the ice mass field and
! velocities. If 0 or negative the coupling time step will be used.
MERGED_CONTINUITY = False ! [Boolean] default = False
! If true, update the continuity equations for the ice, snow, and melt pond
! water together summed across categories, with proportionate fluxes for each
! part. Otherwise the media are updated separately.
NSTEPS_ADV = 1 ! default = 1
! The number of advective iterations for each slow dynamics time step.
ICEBERG_WINDSTRESS_BUG = False ! [Boolean] default = False
! If true, use older code that applied an old ice-ocean stress to the icebergs
! in place of the current air-ocean stress. This option is here for backward
! compatibility, but should be avoided.
WARSAW_SUM_ORDER = True ! [Boolean] default = True
! If true, use the order of sums in the Warsaw version of SIS2. The default is
! the opposite of MERGED_CONTINUITY. This option exists for backward
! compatibilty but may eventually be obsoleted.
TIMEUNIT = 8.64E+04 ! [s] default = 8.64E+04
! The time unit for ICE_STATS_INTERVAL.
ICE_STATS_INTERVAL = 0.0416666666666667 ! [days] default = 1.0
! The interval in units of TIMEUNIT between writes of the globally summed ice
! statistics and conservation checks.
DT_RHEOLOGY = -1.0 ! [seconds] default = -1.0
! The sub-cycling time step for iterating the rheology and ice momentum
! equations. If DT_RHEOLOGY is negative, the time step is set via NSTEPS_DYN.
NSTEPS_DYN = 432 ! default = 432
! The number of iterations of the rheology and ice momentum equations for each
! slow ice time step.
ICE_TDAMP_ELASTIC = -0.2 ! [s or nondim] default = -0.2
! The damping timescale associated with the elastic terms in the sea-ice
! dynamics equations (if positive) or the fraction of DT_ICE_DYNAMICS (if
! negative).
WEAK_LOW_SHEAR_ICE = False ! [Boolean] default = False
! If true, the divergent stresses go toward 0 in the C-grid dynamics when the
! shear magnitudes are very weak. Otherwise they go to -P_ice. This setting is
! temporary.
PROJECT_ICE_DRAG_VEL = True ! [Boolean] default = True
! If true, project forward the ice velocity used in the drag calculation to
! avoid an instability that can occur when a finite stress is applied to thin
! ice moving with the velocity of the ocean.
ICE_YIELD_ELLIPTICITY = 1.5 ! [Nondim] default = 2.0
! The ellipticity coefficient for the plastic yield curve in the sea-ice
! rheology. For an infinite ellipticity (i.e., a cavitating fluid rheology),
! use 0.
ICE_STRENGTH_PSTAR = 2.75E+04 ! [Pa] default = 2.75E+04
! A constant in the expression for the ice strength, P* in Hunke & Dukowicz
! 1997.
ICE_STRENGTH_CSTAR = 20.0 ! [nondim] default = 20.0
! A constant in the exponent of the expression for the ice strength, c* in Hunke
! & Dukowicz 1997.
ICE_CDRAG_WATER = 0.00324 ! [nondim] default = 0.00324
! The drag coefficient between the sea ice and water.
MIN_OCN_INTERTIAL_H = 0.0 ! [m] default = 0.0
! A minimum ocean thickness used to limit the viscous coupling rate implied for
! the ocean by the ice-ocean stress. Only used if positive.
ICE_DEL_SH_MIN_SCALE = 2.0 ! [nondim] default = 2.0
! A scaling factor for the lower bound on the shear rates used in the
! denominator of the stress calculation. This probably needs to be greater than
! 1.
PROJECT_ICE_CONCENTRATION = True ! [Boolean] default = True
! If true, project the evolution of the ice concentration due to the convergence
! or divergence of the ice flow.
VEL_UNDERFLOW = 0.0 ! [m s-1] default = 0.0
! A negligibly small velocity magnitude below which velocity components are set
! to 0. A reasonable value might be 1e-30 m/s, which is less than an Angstrom
! divided by the age of the universe.
STRESS_UNDERFLOW = 0.0 ! [Pa m] default = 0.0
! A negligibly small magnitude below which ice stress tensor components are set
! to 0. A reasonable value might be 1e-15 kg m-1 s-1 times vel_underflow.
CFL_TRUNCATE = 0.5 ! [nondim] default = 0.5
! The value of the CFL number that will cause ice velocity components to be
! truncated; instability can occur past 0.5.
CFL_TRUNC_DYN_ITS = False ! [Boolean] default = False
! If true, check the CFL number for every iteration of the rheology solver;
! otherwise only the final velocities that are used for transport are checked.
LEMIEUX_LANDFAST = False ! [Boolean] default = False
! If true, turn on Lemieux landfast ice parameterization.
ITD_LANDFAST = True ! [Boolean] default = False
! If true, turn on probabilistic landfast ice parameterization.
LEMIEUX_ALPHA_B = 20.0 ! [Nondim] default = 20.0
! The value of a third Lemieux landfast ice tuneable parameter.
LEMIEUX_U0 = 5.0E-05 ! [m s-1] default = 5.0E-05
! Velocity for Lemieux landfast ice.
BASAL_STRESS_MIN_THICK = 0.01 ! [m] default = 0.01
! Minimum ice thickness for grounding in ITD landfast ice.
BASAL_STRESS_MAX_DEPTH = 50.0 ! [m] default = 50.0
! Maximum water depth for grounding in ITD landfast ice.
BASAL_STRESS_MU_S = 0.1 ! [nondim] default = 0.1
! Drag coefficient in ITD landfast ice.
BASAL_STRESS_PUNY = 1.0E-20 ! [nondim] default = 1.0E-20
! Small number in ITD landfast ice.
BASAL_STRESS_SCALE = 1.0 ! [m] default = 1.0
! Scale factor in ITD landfast ice.
BASAL_STRESS_CUTOFF = 1.943 ! [nondim] default = 1.943
! Scale factor in ITD landfast ice.
H2_FILE = "ocean_topoh2.nc" !
! The path to the file containing the sub-grid-scale topographic roughness
! amplitude with ITD_LANDFAST.
BATHY_ROUGHNESS_MIN = 2.5 ! [m] default = 2.5
! Minimum bathymetric roughness.
BATHY_ROUGHNESS_MAX = 2.5 ! [m] default = 2.5
! Maximum bathymetric roughness.
BASAL_STRESS_NCAT_B = 10 ! default = 100
! Number of bathymetric depth categories in landfast ice computation.
BASAL_STRESS_NCAT_I = 100 ! default = 100
! Number of ice thickness categories in landfast ice computation.
RECATEGORIZE_ICE = True ! [Boolean] default = True
! If true, readjust the distribution into ice thickness categories after
! advection.
SEA_ICE_ROLL_FACTOR = 1.0 ! [Nondim] default = 1.0
! A factor by which the propensity of small amounts of thick sea-ice to become
! thinner by rolling is increased or 0 to disable rolling. This can be thought
! of as the minimum number of ice floes in a grid cell divided by the horizontal
! floe aspect ratio. Sensible values are 0 (no rolling) or larger than 1.
ICE_COVER_DISCARD = 1.0E-30 ! [nondim] default = -1.0
! A tiny fractional ice coverage which if positive causes the mass in categories
! with less than this coverage to be discarded.
SIS_THICKNESS_ADVECTION_SCHEME = "PPM:H3" ! default = "UPWIND_2D"
! The horizontal transport scheme for thickness:
! UPWIND_2D - Non-directionally split upwind
! PCM - Directionally split piecewise constant
! PLM - Piecewise Linear Method
! PPM:H3 - Piecewise Parabolic Method (Huyhn 3rd order)
INCONSISTENT_COVER_BUG = False ! [Boolean] default = False
! If true, omit a recalculation of the fractional ice-free areal coverage after
! the adjustment of the ice categories.
SIS_CONTINUITY_SCHEME = "PPM:C2PD" ! default = "UPWIND_2D"
! The horizontal transport scheme used in continuity:
! UPWIND_2D - Non-directionally split upwind
! PCM - Directionally split piecewise constant
! PPM:C2PD - Positive definite PPM with 2nd order edge values
! PPM:C2MO - Monotonic PPM with 2nd order edge values
CONT_PPM_VOLUME_BASED_CFL = False ! [Boolean] default = False
! If true, use the ratio of the open face lengths to the tracer cell areas when
! estimating CFL numbers.
CONTINUITY_H_NEGLECT = 1.0E-28 ! [kg m-2] default = 0.0
! The category ice mass per ocean cell area below which the transport within
! this thickness category of out of a cell is set to zero. A suggested
! non-default value might be of order 3e-32 kg m-2, which is one molecule of ice
! per square kilometer.
CONTINUITY_FRAC_NEGLECT = 1.0E-20 ! [nondim] default = 0.0
! When the total fluxes are distributed between categories with
! MERGED_CONTINUITY, any category whose ice is less than this fraction of the
! total mass contributes no flux. Without MERGED_CONTINUITY, any snow or melt
! pond transport that is less than this fraction of the ice transport is zeroed
! out. A suggested non-default value might be of order 1e-20.
! === module SIS_tracer_advect ===
SIS_TRACER_ADVECTION_SCHEME = "PPM:H3" ! default = "UPWIND_2D"
! The horizontal transport scheme for tracers:
! UPWIND_2D - Non-directionally split upwind
! PCM - Directionally split piecewise constant
! PLM - Piecewise Linear Method
! PPM:H3 - Piecewise Parabolic Method (Huyhn 3rd order)
CFL_MASS_NEGLECT_BUG = False ! [Boolean] default = False
! If true use a globally constant negligible volume in the denominator of the
! tracer advection CFL calculation, reproducing an older incorrect expression,
! rather than using a proper scaling of this negligible mass with cell area.
ADCROFT_ADVECTIVE_CFL = True ! [Boolean] default = False
! If true use the Adcroft reciprocal of the cell mass when calculating the
! advective CFL numbers used in PPM tracer advection schemes, rather than adding
! a small mass in the denominator of the advective CFL ratio.
NEW_RIDGE_PARTICIPATION = False ! [Boolean] default = False
! Participation function used in ridging, .false. for Thorndike et al. 1975
! .true. for Lipscomb et al. 2007
NEW_RIDGE_REDISTRIBUTION = False ! [Boolean] default = False
! Redistribution function used in ridging, .false. for Hibler 1980 .true. for
! Lipscomb et al. 2007
ICEPACK_CLEANUP = False ! [Boolean] default = False
! Tell icepack_step_ridge to call itd_cleanup for us.
ICEPACK_REBIN = False ! [Boolean] default = False
! Tell icepack_step_ridge to call rebin for us.
! === module SIS_sum_output ===
WRITE_STOCKS = True ! [Boolean] default = True
! If true, write the integrated tracer amounts to stdout when the statistics
! files are written.
STDOUT_HEARTBEAT = True ! [Boolean] default = True
! If true, periodically write sea ice statistics to stdout to allow the progress
! to be seen.
MAXTRUNC = 200 ! [truncations save_interval-1] default = 0
! The run will be stopped, and the day set to a very large value if the velocity
! is truncated more than MAXTRUNC times between writing ice statistics. Set
! MAXTRUNC to 0 to stop if there is any truncation of sea ice velocities.
STATISTICS_FILE = "seaice.stats" ! default = "seaice.stats"
! The file to use to write the globally integrated statistics.
! === module SIS_ice_diagnostics ===
! This module handles sea-ice state diagnostics.
! === module SIS_fast_thermo ===
! This module applies rapidly varying heat fluxes to the ice and does an implicit surface temperature
! calculation.
REORDER_0C_HEATFLUX = False ! [Boolean] default = False
! If true, rearrange the calculation of the heat fluxes projected back to 0C to
! work on each contribution separately, so that they can be indentically
! replicated if there is a single fast timestep per coupled timestep and
! REDO_FAST_ICE_UPDATE=True.
MAX_TSKIN_ITT = 10 ! default = 10
! The maximum number of iterations of the skin temperature and optical
! properties during redo_update_ice_model_fast.
! === module SIS2_ice_thm (updates) ===
! This sub-module does updates of the sea-ice due to thermodynamic changes.
! === module SIS_optics ===
! This module calculates the albedo and absorption profiles for shortwave radiation.
DO_DELTA_EDDINGTON_SW = True ! [Boolean] default = True
! If true, a delta-Eddington radiative transfer calculation for the shortwave
! radiation within the sea-ice.
ICE_DELTA_EDD_R_ICE = 1.0 ! [nondimensional] default = 0.0
! A dreadfully documented tuning parameter for the radiative propeties of sea
! ice with the delta-Eddington radiative transfer calculation.
ICE_DELTA_EDD_R_SNOW = 1.0 ! [nondimensional] default = 0.0
! A dreadfully documented tuning parameter for the radiative propeties of snow
! on sea ice with the delta-Eddington radiative transfer calculation.
ICE_DELTA_EDD_R_POND = 1.0 ! [nondimensional] default = 0.0
! A dreadfully documented tuning parameter for the radiative propeties of
! meltwater ponds on sea ice with the delta-Eddington radiative transfer
! calculation.
! === module MOM_file_parser ===
SEND_LOG_TO_STDOUT = False ! [Boolean] default = False
! If true, all log messages are also sent to stdout.
DOCUMENT_FILE = "SIS_parameter_doc" ! default = "SIS_parameter_doc"
! The basename for files where run-time parameters, their settings, units and
! defaults are documented. Blank will disable all parameter documentation.
COMPLETE_DOCUMENTATION = True ! [Boolean] default = True
! If true, all run-time parameters are documented in SIS_parameter_doc.all .
MINIMAL_DOCUMENTATION = True ! [Boolean] default = True
! If true, non-default run-time parameters are documented in
! SIS_parameter_doc.short .