-
Notifications
You must be signed in to change notification settings - Fork 55
/
ice_model.F90
1343 lines (1169 loc) · 52.8 KB
/
ice_model.F90
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
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
!***********************************************************************
!* GNU Lesser General Public License
!*
!* This file is part of the GFDL Flexible Modeling System (FMS) Coupler.
!*
!* FMS Coupler is free software: you can redistribute it and/or modify
!* it under the terms of the GNU Lesser General Public License as
!* published by the Free Software Foundation, either version 3 of the
!* License, or (at your option) any later version.
!*
!* FMS Coupler is distributed in the hope that it will be useful, but
!* WITHOUT ANY WARRANTY; without even the implied warranty of
!* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
!* General Public License for more details.
!*
!* You should have received a copy of the GNU Lesser General Public
!* License along with FMS Coupler.
!* If not, see <http://www.gnu.org/licenses/>.
!***********************************************************************
!> \file
!> \brief Handles ice component updates and time steps
module ice_model_mod
!! Components
use ice_albedo_mod, only: ice_albedo_init, ice_albedo
use ocean_albedo_mod, only: compute_ocean_albedo_new
use ocean_rough_mod, only: compute_ocean_roughness, fixed_ocean_roughness
!! FMS
use FMS
use FMSconstants, only: HLV, HLF, TFREEZE, pi
implicit none
private
real :: cmin,cmax
public :: ice_data_type, atmos_ice_boundary_type, &
ice_model_init, ice_model_end, update_ice_model_fast, &
update_ice_model_slow
!----------------------------------------------------------------
!--------- NAMELIST INTERFACE ---------
!
! use_climo_ice = use monthly climatological amip ice mask
! use_annual_ice = use annual climatology amip ice mask
! temp_ice_freeze = temperature at which sea ice melts
! heat_capacity_ocean = heat capacity for ocean in simple mixed layer model
!
real :: diff = 2.092
real :: thickness_min = 0.10
real :: specified_ice_thickness = 2.0
real :: heat_capacity_ocean = 1.e07
real :: temp_ice_freeze = -1.66
real :: roughness_ice = 1.e-4
logical :: mixed_layer_ocean = .false.
logical :: use_climo_ice = .false.
logical :: use_annual_ice = .false.
logical :: use_climo_sst = .false.
logical :: use_annual_sst = .false.
character(len=64) :: ice_method = 'prognostic' ! none, uniform, or prognostic
character(len=64) :: sst_method = 'specified' !> specified, uniform, or mixed_layer
!! Additional sst specifications: 'aqua_planet_#' test cases are derived
!! from the 2000 paper by Neale and Hoskins, 'A standard test for AGCMs including
!! their physical parameterizations: I. The proposal, Atmospheric Science Letters'.
!! The 'aqua_planet_1' testcase corresponds to the 'Control' SST test case and
!! provides the pattern which is shifted for the subsequent cases.
!! The test cases Control, and aqua_planet_5N-aqua_planet_60N were documented and used
!! in Burnett et al., 2021, GRL, https://doi.org/10.1029/2020GL091980
!! aqua_planet_1 = Control profile
!! aqua_planet_2 = Peaked
!! aqua_planet_3 = Flat
!! aqua_planet_4 = Qobs
!! aqua_planet_5 = Control shifted by 5N
!! aqua_planet_6 = 1KEQ
!! aqua_planet_7 = 3KEQ
!! aqua_planet_8 = 3KW1
!! aqua_planet_10N = Control shifted by 10N
!! aqua_planet_15N = Control shifted by 15N
!! aqua_planet_20N = Control shifted by 20N
!! aqua_planet_25N = Control shifted by 25N
!! aqua_planet_30N = Control shifted by 20N
!! aqua_planet_35N = Control shifted by 35N
!! aqua_planet_40N = Control shifted by 30N
!! aqua_planet_45N = Control shifted by 45N
!! aqua_planet_50N = Control shifted by 50N
!! aqua_planet_55N = Control shifted by 55N
!! aqua_planet_60N = Control shifted by 60N
!! aqua_planet_65N = Control shifted by 65N
!! aqua_planet_70N = Control shifted by 70N
!! aqua_planet_75N = Control shifted by 75N
!! aqua_planet_80N = Control shifted by 80N
!! aqua_planet_85N = Control shifted by 85N
!! aqua_planet_90N = Control shifted by 90N
real :: temp_ice = 270. ! used when ice_method = 'uniform'
real :: temp_sst = 280. ! used when sst_method = 'uniform'
real :: sst_anom = 0. ! sst perturbation used for sensitivity experiments
character(len=64) :: interp_method = "bilinear" ! conservative or bilinear
logical :: do_netcdf_restart = .true.
namelist /ice_model_nml/ diff, thickness_min, specified_ice_thickness, &
heat_capacity_ocean, temp_ice_freeze, roughness_ice, &
ice_method, use_climo_ice, use_annual_ice, temp_ice, &
sst_method, use_climo_sst, use_annual_sst, temp_sst, &
interp_method, do_netcdf_restart, sst_anom
!----------------------------------------------------------------
type ice_data_type
type(FmsMppDomain2D),pointer :: Domain
real, pointer, dimension(:,:) :: glon_bnd =>NULL(), &
glat_bnd =>NULL(), &
lon_bnd =>NULL() , &
lat_bnd =>NULL()
real, pointer, dimension(:,:) :: glon =>NULL(), &
glat =>NULL(), &
lon =>NULL(), &
lat =>NULL()
logical, pointer, dimension(:,:) :: gmask =>NULL(), &
mask =>NULL(), &
ice_mask =>NULL()
real, pointer, dimension(:,:) :: t_surf =>NULL(), &
albedo =>NULL(), &
albedo_vis_dir =>NULL(), &
albedo_nir_dir =>NULL(), &
albedo_vis_dif =>NULL(), &
albedo_nir_dif =>NULL(), &
rough_mom =>NULL(),&
rough_heat =>NULL(), &
rough_moist =>NULL(), &
thickness =>NULL()
type (FmsTime_type) :: Time_Init, Time, &
Time_step_fast, &
Time_step_slow
end type ice_data_type
!----------------------------------------------------------------
type :: atmos_ice_boundary_type
real, dimension(:,:), pointer :: u_star =>NULL(), &
t_flux =>NULL(), &
q_flux =>NULL(), &
lw_flux =>NULL(), &
sw_flux =>NULL(), &
lprec =>NULL(), &
fprec =>NULL()
real, dimension(:,:), pointer :: dhdt =>NULL(), &
dedt =>NULL(), &
drdt =>NULL(), &
coszen =>NULL(), &
data =>NULL()
integer :: xtype
end type atmos_ice_boundary_type
!----------------------------------------------------------------
integer :: is, ie, js, je
type(FmsAmipInterp_type), save :: Amip_ice, Amip_sst
logical :: module_is_initialized = .false.
character(len=64) :: fname = 'INPUT/ice_model.res.nc'
character(len=128) :: version = '$Id$'
character(len=128) :: tagname = '$Name$'
real, parameter :: LATENT = HLV + HLF
contains
!######################################################################
subroutine update_ice_model_fast( Atmos_boundary, Ice )
type(atmos_ice_boundary_type), intent(in) :: Atmos_boundary
type (ice_data_type), intent(inout) :: Ice
real, dimension(is:ie,js:je) :: ts_new, gamma, flux_i, t_dt_surf, &
flux_t_new, flux_q_new, flux_lw_new, flux_sw_new, &
flux_u_new, flux_v_new, lprec_new, fprec_new, &
deriv
logical, dimension(is:ie,js:je,2) :: mask_ice
real, dimension(is:ie,js:je,2) :: thickness_ice, t_surf_ice, albedo
real, dimension(is:ie,js:je) :: albedo_vis_dir, albedo_nir_dir, &
albedo_vis_dif, albedo_nir_dif
integer :: dt
!-----------------------------------------------------------------------
!
! updates ice model on the atmospheric (fast) time step
! averages input quantities to be seen by the ocean
!
! flux_u = zonal wind stress
! flux_v = meridional wind stress
! flux_sw = net shortwave radiation (down-up)
! flux_sw_vis = net visible shortwave radiation (down-up)
! flux_sw_dir = net direct shortwave radiation (down-up)
! flux_sw_dif = net diffuse shortwave radiation (down-up)
! flux_sw_vis_dir = net visible direct shortwave radiation (down-up)
! flux_sw_vis_dif = net visible diffuse shortwave radiation (down-up)
! flux_lw = net longwave radiation (down-up)
! flux_t = sensible heat flux
! flux_q = specific humidity flux
! lprec = liquid precipitiation rate (kg/m2/s)
! fprec = frozen precipitiation rate (kg/m2/s)
! coszen = cosine of the zenith angle
!
!-----------------------------------------------------------------------
!----- implicit update of ice surface temperature -----
if (trim(ice_method) == 'prognostic') then
where (Ice%ice_mask)
gamma = diff / max(Ice%thickness,thickness_min)
flux_i = gamma * (TFREEZE + temp_ice_freeze - Ice%t_surf)
t_dt_surf = (flux_i + Atmos_boundary%lw_flux + Atmos_boundary%sw_flux - &
Atmos_boundary%t_flux - Atmos_boundary%q_flux*LATENT) &
/ (Atmos_boundary%dhdt + Atmos_boundary%dedt*LATENT + &
Atmos_boundary%drdt + gamma)
ts_new = Ice%t_surf + t_dt_surf
elsewhere
ts_new = 0.
endwhere
! update sea ice temperature
! new temperature cannot be greater than freezing temperature
where (Ice%ice_mask .and. ts_new > TFREEZE )
Ice%t_surf = TFREEZE
endwhere
where (Ice%ice_mask .and. ts_new <= TFREEZE)
Ice%t_surf = ts_new
endwhere
endif
if (trim(ice_method) == 'uniform') then
where (Ice%ice_mask)
!t_dt_surf = temp_ice - Ice%t_surf
Ice%t_surf = temp_ice
endwhere
endif
!-----------------------------------------------------------------------
!----- simple mixed layer ocean ------
if (trim(sst_method) == 'mixed_layer') then
call fms_time_manager_get_time ( Ice%Time_step_slow, dt )
where (Ice%mask .and. .not. Ice%ice_mask)
flux_i = ( Atmos_boundary%lw_flux + Atmos_boundary%sw_flux - &
Atmos_boundary%t_flux - Atmos_boundary%q_flux*HLV - &
Atmos_boundary%fprec*HLF ) * real(dt)/heat_capacity_ocean
deriv = -( Atmos_boundary%dhdt + Atmos_boundary%dedt*HLV + &
Atmos_boundary%drdt) * real(dt)/heat_capacity_ocean
t_dt_surf = flux_i/(1.0 -deriv)
ts_new = Ice%t_surf + t_dt_surf
endwhere
! update sea surface temperature
! note: temperatures allowed below freezing for conservation
where (Ice%mask .and. .not.Ice%ice_mask)
Ice%t_surf = ts_new
endwhere
endif
if (trim(sst_method) == 'uniform') then
where (Ice%mask .and. .not.Ice%ice_mask)
Ice%t_surf = temp_sst
endwhere
endif
!-----------------------------------------------------------------------
!------ update ocean/ice surface parameters --------
!---- over all ocean points (regardless of ice) ----
call compute_ocean_roughness ( Ice%mask, &
Atmos_boundary%u_star(:,:), &
Ice%rough_mom (:,:), &
Ice%rough_heat (:,:), &
Ice%rough_moist(:,:) )
call compute_ocean_albedo_new ( Ice%mask, Atmos_boundary%coszen(:,:), &
albedo_vis_dir, albedo_vis_dif, albedo_nir_dir, albedo_nir_dif, Ice%lat )
!---- over only ice points -----
where (Ice%ice_mask)
Ice%rough_mom = roughness_ice
Ice%rough_heat = roughness_ice
Ice%rough_moist = roughness_ice
endwhere
mask_ice (:,:,2) = Ice%ice_mask
thickness_ice(:,:,2) = Ice%thickness
t_surf_ice (:,:,2) = Ice%t_surf
albedo (:,:,2) = Ice%albedo
albedo (:,:,1) = Ice%albedo
call ice_albedo (mask_ice, thickness_ice, t_surf_ice, albedo)
where (Ice%ice_mask)
Ice%albedo = albedo(:,:,2)
Ice%albedo_vis_dir = albedo(:,:,2)
Ice%albedo_nir_dir = albedo(:,:,2)
Ice%albedo_vis_dif = albedo(:,:,2)
Ice%albedo_nir_dif = albedo(:,:,2)
elsewhere
Ice%albedo = albedo(:,:,1)
Ice%albedo_vis_dir = albedo_vis_dir
Ice%albedo_nir_dir = albedo_vis_dir
Ice%albedo_vis_dif = albedo_vis_dir
Ice%albedo_nir_dif = albedo_vis_dir
endwhere
!-----------------------------------------------------------------------
!--------- advance time -----------------
Ice%Time = Ice%Time + Ice%Time_step_fast
!-----------------------------------------------------------------------
end subroutine update_ice_model_fast
!######################################################################
subroutine update_ice_model_slow( Atmos_boundary, Ice )
type(atmos_ice_boundary_type), intent(in) :: Atmos_boundary
type(ice_data_type), intent(inout) :: Ice
!---- get the specified sea-ice fraction -----
if (trim(ice_method) == 'prognostic' .or. trim(ice_method) == 'uniform') then
call prognostic_ice ( Ice )
endif
!---- get the specified ocean temperature -----
if (trim(sst_method) == 'specified') then
call prognostic_sst ( Ice )
endif
end subroutine update_ice_model_slow
!######################################################################
subroutine prognostic_ice ( Ice )
type(ice_data_type), intent(inout) :: Ice
real, dimension(is:ie, js:je) :: ice_frac
!---- get the specified sea-ice fraction -----
call fms_amip_interp_get_amip_ice (Ice%Time, Amip_ice, ice_frac )
! determine which grid boxes have ice coverage
where ( Ice%mask(:,:) .and. ice_frac > 0.5 )
Ice%thickness(:,:) = specified_ice_thickness
Ice%ice_mask (:,:) = .true.
Ice%t_surf (:,:) = MIN( Ice%t_surf(:,:), TFREEZE )
elsewhere
Ice%thickness(:,:) = 0.0
Ice%ice_mask (:,:) = .false.
Ice%t_surf (:,:) = MAX( Ice%t_surf(:,:), TFREEZE )
endwhere
end subroutine prognostic_ice
!######################################################################
subroutine prognostic_sst ( Ice )
type(ice_data_type), intent(inout) :: Ice
real, dimension(is:ie, js:je) :: sea_temp
!---- get the specified ocean temperature -----
call fms_amip_interp_get_amip_sst (Ice%Time, Amip_sst, sea_temp )
! determine which grid boxes have open ocean coverage ----
where ( Ice%mask(:,:) .and. .not.Ice%ice_mask(:,:))
Ice%t_surf (:,:) = sea_temp
endwhere
end subroutine prognostic_sst
!######################################################################
! subroutine update_ice_model_slow_up ( Ocean_boundary, Ice )
! type(ocean_ice_boundary_type), intent(in) :: Ocean_boundary
! type(ice_data_type), intent(inout) :: Ice
! set temp at open ocean points
! end subroutine update_ice_model_slow_up
!######################################################################
subroutine ice_model_init ( Ice, Time_Init, Time, &
Time_step_fast, Time_step_slow, &
glon_bnd, glat_bnd, Atmos_domain )
type(ice_data_type), intent(inout) :: Ice
type(FmsTime_type) , intent(in) :: Time_Init, Time, &
Time_step_fast, Time_step_slow
real , intent(in) :: glon_bnd(:,:), glat_bnd(:,:)
type(FmsMppDomain2D), intent(in), target :: Atmos_domain
real :: lon0, lond, latd, amp, t_control, dellon, dom_wid, siggy, tempi
integer :: isg, ieg, jsg, jeg
integer :: unit, ierr, io, i, j
integer :: ndim, nvar, natt, ntime, nlon, nlat, mlon, mlat, layout(2)
logical :: need_ic
type(FmsNetcdfDomainFile_t) :: land_mask_fileobj !< Land mask domain decomposed fileobj
type(FmsNetcdfDomainFile_t) :: ice_restart_fileobj !< Ice restart domain decomposed fileobj
if (module_is_initialized) then
return
endif
!< Read the namelist
read (fms_mpp_input_nml_file, nml=ice_model_nml, iostat=io)
ierr = check_nml_error(io, 'ice_model_nml')
do_netcdf_restart = .true. !< Always do netcdf!
call fms_write_version_number (version, tagname)
if ( fms_mpp_pe() == fms_mpp_root_pe() ) then
write (fms_mpp_stdlog(), nml=ice_model_nml)
endif
!---- error checks ----
if ( trim(ice_method) /= 'none' .and. &
trim(ice_method) /= 'uniform' .and. &
trim(ice_method) /= 'prognostic' ) call error_mesg &
('ice_model_init', 'namelist variable ice_method has invalid value', FATAL)
if ( trim(sst_method) /= 'specified' .and. &
trim(sst_method) /= 'uniform' .and. &
trim(sst_method) /= 'aqua_planet_1' .and. &
trim(sst_method) /= 'aqua_planet_2' .and. &
trim(sst_method) /= 'aqua_planet_3' .and. &
trim(sst_method) /= 'aqua_planet_4' .and. &
trim(sst_method) /= 'aqua_planet_5' .and. &
trim(sst_method) /= 'aqua_planet_6' .and. &
trim(sst_method) /= 'aqua_planet_7' .and. &
trim(sst_method) /= 'aqua_planet_8' .and. &
trim(sst_method) /= 'aqua_planet_10N' .and. &
trim(sst_method) /= 'aqua_planet_15N' .and. &
trim(sst_method) /= 'aqua_planet_20N' .and. &
trim(sst_method) /= 'aqua_planet_25N' .and. &
trim(sst_method) /= 'aqua_planet_30N' .and. &
trim(sst_method) /= 'aqua_planet_35N' .and. &
trim(sst_method) /= 'aqua_planet_40N' .and. &
trim(sst_method) /= 'aqua_planet_45N' .and. &
trim(sst_method) /= 'aqua_planet_50N' .and. &
trim(sst_method) /= 'aqua_planet_55N' .and. &
trim(sst_method) /= 'aqua_planet_60N' .and. &
trim(sst_method) /= 'aqua_planet_65N' .and. &
trim(sst_method) /= 'aqua_planet_70N' .and. &
trim(sst_method) /= 'aqua_planet_75N' .and. &
trim(sst_method) /= 'aqua_planet_80N' .and. &
trim(sst_method) /= 'aqua_planet_85N' .and. &
trim(sst_method) /= 'aqua_planet_90N' .and. &
trim(sst_method) /= 'aqua_walker' .and. &
trim(sst_method) /= 'aqua_walker_cos' .and. &
trim(sst_method) /= 'aqua_walker_guass' .and. &
trim(sst_method) /= 'aqua_walker_guass_b' .and. &
trim(sst_method) /= 'aqua_walker_guass_c' .and. &
trim(sst_method) /= 'aqua_walker_guass_d' .and. &
trim(sst_method) /= 'mixed_layer' ) call error_mesg &
('ice_model_init', 'namelist variable sst_method has invalid value', FATAL)
!----------------------------------------------------------
nlon = size(glon_bnd,1)-1
nlat = size(glon_bnd,2)-1
!----------------------------------------------------------
!--- set up domain type ---
! if (present(Atmos_domain)) then
! call mpp_get_layout (Atmos_domain, layout)
! else
! call mpp_define_layout ( (/1,nlon,1,nlat/), fms_mpp_npes(), layout )
! endif
! call mpp_define_domains ( (/1,nlon,1,nlat/), layout, Ice%Domain, &
! name='ice grid')
Ice%Domain => Atmos_domain
!----------------------------------------------------------
! get global domain indices
! this assumes that FmsMppDomain2D type has been assigned
call fms_mpp_domains_get_global_domain ( Ice%Domain, isg, ieg, jsg, jeg )
allocate ( Ice%glon_bnd (isg:ieg+1,jsg:jeg+1), &
Ice%glat_bnd (isg:ieg+1,jsg:jeg+1), &
Ice%glon (isg:ieg,jsg:jeg), &
Ice%glat (isg:ieg,jsg:jeg), &
Ice%gmask (isg:ieg,jsg:jeg) )
!----------------------------------------------------------
!--- read grid info ----
Ice%glon_bnd = glon_bnd
Ice%glat_bnd = glat_bnd
!do j = js, je+1
!do i = is, ie+1
! Ice%glon_bnd(i,j) = glon_bnd(i-isg+1,j-jsg+1)
! Ice%glat_bnd(i,j) = glat_bnd(i-isg+1,j-jsg+1)
!enddo
!enddo
! set io domain if not there in order to check files
if ( .not. associated(fms_mpp_domains_get_io_domain(Ice%domain)) ) then
call fms_mpp_domains_define_io_domain(Ice%domain, (/ 1, 1 /) )
endif
! read the land mask from a file (land=1)
if (fms2_io_open_file(land_mask_fileobj, 'INPUT/land_mask.nc', 'read', Ice%domain)) then
call fms2_io_read_data (land_mask_fileobj, 'land_mask', Ice%glon)
where (Ice%glon > 0.50)
Ice%gmask = .false.
elsewhere
Ice%gmask = .true.
endwhere
call fms2_io_close_file(land_mask_fileobj)
else
Ice%gmask = .true. ! aqua-planet
endif
! mid-point of grid box
!if (is_latlon(glon_bnd,latb_out)) then
! do j = js, je
! do i = is, ie
! Ice%glon(i,j) = (Ice%glon_bnd(i,j )+Ice%glon_bnd(i+1,j )+ &
! Ice%glon_bnd(i,j+1)+Ice%glon_bnd(i+1,j+1))*0.25
! Ice%glat(i,j) = (Ice%glat_bnd(i,j )+Ice%glat_bnd(i+1,j )+ &
! Ice%glat_bnd(i,j+1)+Ice%glat_bnd(i+1,j+1))*0.25
! enddo
! enddo
!else
call get_cell_center (Ice%glon_bnd, Ice%glat_bnd, Ice%glon, Ice%glat)
!endif
!----------------------------------------------------------
! get compute domain indices
call fms_mpp_domains_get_compute_domain ( Ice%Domain, is, ie, js, je )
allocate ( Ice%lon_bnd (is:ie+1,js:je+1), &
Ice%lat_bnd (is:ie+1,js:je+1), &
Ice%lon (is:ie, js:je) , &
Ice%lat (is:ie, js:je) , &
Ice%ice_mask (is:ie, js:je) , &
Ice%t_surf (is:ie, js:je) , &
Ice%albedo (is:ie, js:je) , &
Ice%albedo_vis_dir (is:ie, js:je) , &
Ice%albedo_nir_dir (is:ie, js:je) , &
Ice%albedo_vis_dif (is:ie, js:je) , &
Ice%albedo_nir_dif (is:ie, js:je) , &
Ice%rough_mom (is:ie, js:je) , &
Ice%rough_heat (is:ie, js:je) , &
Ice%rough_moist (is:ie, js:je) , &
Ice%thickness (is:ie, js:je) , &
Ice%mask (is:ie, js:je) )
Ice%lon_bnd = Ice%glon_bnd(is:ie+1,js:je+1)
Ice%lat_bnd = Ice%glat_bnd(is:ie+1,js:je+1)
Ice%lon = Ice%glon(is:ie, js:je)
Ice%lat = Ice%glat(is:ie, js:je)
Ice%mask = Ice%gmask(is:ie, js:je)
Ice%Time = Time
Ice%Time_init = Time_init
Ice%Time_step_fast = Time_step_fast
Ice%Time_step_slow = Time_step_slow
!----------------------------------------------------------
!----------- read restart -------------
need_ic = .false.
if (fms2_io_open_file(ice_restart_fileobj, 'INPUT/ice_model.res.nc', 'read', Ice%domain, is_restart=.true.)) then
if (fms_mpp_pe() == fms_mpp_root_pe()) call error_mesg ('ice_model_mod', &
'Reading NetCDF formatted restart file: INPUT/ice_model.res.nc', NOTE)
call fms2_io_read_data(ice_restart_fileobj, 'mlon', mlon)
call fms2_io_read_data(ice_restart_fileobj, 'mlat', mlat)
if (mlon /= nlon .or. mlat /= nlat ) &
call error_mesg ('ice_model_init', &
'incorrect resolution on restart', FATAL)
call ice_register_restart(ice_restart_fileobj, Ice)
call fms2_io_read_restart(ice_restart_fileobj)
call fms2_io_close_file(ice_restart_fileobj)
else
!--- if no restart then no ice ---
need_ic = .true.
Ice%t_surf = TFREEZE ! + temp_ice_freeze
Ice%thickness = 0.0 ! no ice initially
Ice%albedo = 0.14
Ice%albedo_vis_dir = 0.14
Ice%albedo_nir_dir = 0.14
Ice%albedo_vis_dif = 0.14
Ice%albedo_nir_dif = 0.14
Ice%rough_mom = 0.0004
Ice%rough_heat = 0.0004
Ice%rough_moist = 0.0004
! Ice%ice_mask = .false. ! no ice initially
! fixed roughness
call fixed_ocean_roughness ( Ice%mask, Ice%rough_mom, &
Ice%rough_heat, Ice%rough_moist )
endif
! initialize mask where ice exists
Ice%ice_mask = Ice%mask .and. Ice%thickness .ge. thickness_min
call ice_albedo_init (TFREEZE)
! analytic distribution with no ice
! melt all ice
if (sst_method == "aqua_planet_1") then
ice_method = 'none'
Ice%ice_mask = .false.
where (Ice%mask)
Ice%t_surf = 27.*(1.-sin(max(min(1.5*Ice%lat,pi*0.5),-pi*0.5))**2) + TFREEZE
endwhere
else if (sst_method == "aqua_planet_2") then
ice_method = 'none'
Ice%ice_mask = .false.
where (Ice%mask)
Ice%t_surf = 27.*(1.-min(3.*abs(Ice%lat)/pi,1.)) + TFREEZE
endwhere
else if (sst_method == "aqua_planet_3") then
ice_method = 'none'
Ice%ice_mask = .false.
where (Ice%mask)
Ice%t_surf = 27.*(1.-sin(max(min(1.5*Ice%lat,pi*0.5),-pi*0.5))**4) + TFREEZE
endwhere
else if (sst_method == "aqua_planet_4") then
ice_method = 'none'
Ice%ice_mask = .false.
where (Ice%mask)
Ice%t_surf = max(min(1.5*Ice%lat,pi*0.5),-pi*0.5) ! use t_surf as work array
Ice%t_surf = 27.*(1.-0.5*(sin(Ice%t_surf)**2+sin(Ice%t_surf)**4)) + TFREEZE
endwhere
else if (sst_method == "aqua_planet_5") then
ice_method = 'none'
Ice%ice_mask = .false.
do j = js, je
do i = is, ie
if (Ice%mask(i,j)) then
if (Ice%lat(i,j) > pi/36.) then
Ice%t_surf(i,j) = 27.*(1.-sin(min(90./55.*(Ice%lat(i,j)-pi/36.),pi*0.5))**2) + TFREEZE
else
Ice%t_surf(i,j) = 27.*(1.-sin(max(90./65.*(Ice%lat(i,j)-pi/36.),-pi*0.5))**2) + TFREEZE
endif
endif
enddo
enddo
else if (sst_method == "aqua_planet_6" .or. sst_method == "aqua_planet_7") then
ice_method = 'none'
Ice%ice_mask = .false.
! constants
lon0 = 0.
lond = 30.*pi/180.
latd = 15.*pi/180.
if (sst_method == "aqua_planet_6") amp = 1.
if (sst_method == "aqua_planet_7") amp = 3.
do j = js, je
do i = is, ie
if (Ice%mask(i,j)) then
t_control = 27.*(1.-sin(max(min(1.5*Ice%lat(i,j),pi*0.5),-pi*0.5))**2) + TFREEZE
dellon = Ice%lon(i,j)-lon0
if (dellon > pi) dellon = dellon - 2.*pi
if (dellon < -pi) dellon = dellon + 2.*pi
Ice%t_surf(i,j) = t_control + amp * cos(0.5*pi*min(max(dellon/lond,-1.),1.))**2 * &
cos(0.5*pi*min(max(Ice%lat(i,j)/latd,-1.),1.))**2
endif
enddo
enddo
else if (sst_method == "aqua_walker") then
ice_method = 'none'
Ice%ice_mask = .false.
! constants
lon0 = 0.
!lond = 30.*pi/180.
lond = pi/36. ! multiply original lond by 1/6
latd = 15.*pi/180.
amp = 8.
do j = js, je
do i = is, ie
if (Ice%mask(i,j)) then
dellon = Ice%lon(i,j)-lon0
if (dellon > pi) dellon = dellon - 2.*pi
if (dellon < -pi) dellon = dellon + 2.*pi
!Ice%t_surf(i,j) = 27. + TFREEZE + amp * cos(0.5*pi*min(max(dellon/lond,-1.),1.))**2
Ice%t_surf(i,j) = 297. + amp * cos(0.5*pi*min(max(dellon/lond,-1.),1.))**2
endif
enddo
enddo
else if (sst_method == "aqua_walker_guass") then ! see Wofsy and Kuang
ice_method = 'none'
Ice%ice_mask = .false.
! constants
lon0 = 0.
siggy = (pi/8.)*(1./6.) ! sigma in the guassian distribution
!amp = 1./(siggy*SQRT(2*pi))
amp = 8.
do j = js, je
tempi=real(j)
do i = is, ie
if (Ice%mask(i,j)) then
dellon = Ice%lon(i,j)-lon0
if (dellon > pi) dellon = dellon - 2.*pi
if (dellon < -pi) dellon = dellon + 2.*pi
Ice%t_surf(i,j) = 297. + amp*EXP(-0.5*((dellon)**2.)/(siggy)**2)
endif
enddo
enddo
else if (sst_method == "aqua_walker_guass_b") then ! see Wofsy and Kuang
ice_method = 'none'
Ice%ice_mask = .false.
! constants
lon0 = 0.
siggy = (pi/12.)*(1./6.) ! sigma in the guassian distribution
!amp = 1./(siggy*SQRT(2*pi))
amp = 8.
do j = js, je
tempi=real(j)
do i = is, ie
if (Ice%mask(i,j)) then
dellon = Ice%lon(i,j)-lon0
if (dellon > pi) dellon = dellon - 2.*pi
if (dellon < -pi) dellon = dellon + 2.*pi
Ice%t_surf(i,j) = 297. + amp*EXP(-0.5*((dellon)**2.)/(siggy)**2)
endif
enddo
enddo
else if (sst_method == "aqua_walker_guass_c") then ! see Wofsy and Kuang
ice_method = 'none'
Ice%ice_mask = .false.
! constants
lon0 = 0.
siggy = (pi/16.)*(1./6.) ! sigma in the guassian distribution
!amp = 1./(siggy*SQRT(2*pi))
amp = 8.
do j = js, je
tempi=real(j)
do i = is, ie
if (Ice%mask(i,j)) then
dellon = Ice%lon(i,j)-lon0
if (dellon > pi) dellon = dellon - 2.*pi
if (dellon < -pi) dellon = dellon + 2.*pi
Ice%t_surf(i,j) = 297. + amp*EXP(-0.5*((dellon)**2.)/(siggy)**2)
endif
enddo
enddo
else if (sst_method == "aqua_walker_guass_d") then ! see Wofsy and Kuang
ice_method = 'none'
Ice%ice_mask = .false.
! constants
lon0 = 0.
siggy = (pi/20.)*(1./6.) ! sigma in the guassian distribution
!amp = 1./(siggy*SQRT(2*pi))
amp = 4.
do j = js, je
tempi=real(j)
do i = is, ie
if (Ice%mask(i,j)) then
dellon = Ice%lon(i,j)-lon0
if (dellon > pi) dellon = dellon - 2.*pi
if (dellon < -pi) dellon = dellon + 2.*pi
Ice%t_surf(i,j) = 297. + amp*EXP(-0.5*((dellon)**2.)/(siggy)**2)
endif
enddo
enddo
else if (sst_method == "aqua_walker_cos") then ! see Wofsy and Kuang
ice_method = 'none'
Ice%ice_mask = .false.
! constants
lond = pi/36. ! multiply original lond by 1/6
lon0 = 0.
amp = 8.
dom_wid=Ice%lon(is,js)-Ice%lon(is,je)
!dom_wid=real(ie)-real(is)
do j = js, je
tempi=real(j)
do i = is, ie
if (Ice%mask(i,j)) then
dellon = Ice%lon(i,j)-lon0
if (dellon > pi) dellon = dellon - 2.*pi
if (dellon < -pi) dellon = dellon + 2.*pi
Ice%t_surf(i,j) = 297. - amp * cos(0.5*pi*min(max(dellon/lond,-1.),1.))
endif
enddo
enddo
else if (sst_method == "aqua_planet_8") then
ice_method = 'none'
Ice%ice_mask = .false.
! constants
lon0 = 0.
latd = 30.*pi/180.
amp = 3.
where (Ice%mask)
Ice%t_surf = 27.*(1.-sin(max(min(1.5*Ice%lat,pi*0.5),-pi*0.5))**2) + TFREEZE + &
amp * cos(Ice%lon-lon0) * cos(0.5*pi*min(max(Ice%lat/latd,-1.),1.))**2
endwhere
else if (sst_method == "aqua_planet_10N") then
ice_method = 'none'
Ice%ice_mask = .false.
do j = js, je
do i = is, ie
if (Ice%mask(i,j)) then
if (Ice%lat(i,j) > pi/18.) then
Ice%t_surf(i,j) = 27.*(1.-sin(min(90./55.*(Ice%lat(i,j)-pi/18.),pi*0.5))**2) + TFREEZE
else
Ice%t_surf(i,j) = 27.*(1.-sin(max(90./65.*(Ice%lat(i,j)-pi/18.),-pi*0.5))**2) + TFREEZE
endif
endif
enddo
enddo
else if (sst_method == "aqua_planet_15N") then
ice_method = 'none'
Ice%ice_mask = .false.
do j = js, je
do i = is, ie
if (Ice%mask(i,j)) then
if (Ice%lat(i,j) > pi/12.) then
Ice%t_surf(i,j) = 27.*(1.-sin(min(90./55.*(Ice%lat(i,j)-pi/12.),pi*0.5))**2) + TFREEZE
else
Ice%t_surf(i,j) = 27.*(1.-sin(max(90./65.*(Ice%lat(i,j)-pi/12.),-pi*0.5))**2) + TFREEZE
endif
endif
enddo
enddo
else if (sst_method == "aqua_planet_20N") then
ice_method = 'none'
Ice%ice_mask = .false.
do j = js, je
do i = is, ie
if (Ice%mask(i,j)) then
if (Ice%lat(i,j) > pi/9.) then
Ice%t_surf(i,j) = 27.*(1.-sin(min(90./55.*(Ice%lat(i,j)-pi/9.),pi*0.5))**2) + TFREEZE
else
Ice%t_surf(i,j) = 27.*(1.-sin(max(90./65.*(Ice%lat(i,j)-pi/9.),-pi*0.5))**2) + TFREEZE
endif
endif
enddo
enddo
else if (sst_method == "aqua_planet_25N") then
ice_method = 'none'
Ice%ice_mask = .false.
do j = js, je
do i = is, ie
if (Ice%mask(i,j)) then
if (Ice%lat(i,j) > 5.*pi/36.) then
Ice%t_surf(i,j) = 27.*(1.-sin(min(90./55.*(Ice%lat(i,j)-5.*pi/36.),pi*0.5))**2) + TFREEZE
else
Ice%t_surf(i,j) = 27.*(1.-sin(max(90./65.*(Ice%lat(i,j)-5.*pi/36.),-pi*0.5))**2) + TFREEZE
endif
endif
enddo
enddo
else if (sst_method == "aqua_planet_30N") then
ice_method = 'none'
Ice%ice_mask = .false.
do j = js, je
do i = is, ie
if (Ice%mask(i,j)) then
if (Ice%lat(i,j) > pi/6.) then
Ice%t_surf(i,j) = 27.*(1.-sin(min(90./55.*(Ice%lat(i,j)-pi/6.),pi*0.5))**2) + TFREEZE
else
Ice%t_surf(i,j) = 27.*(1.-sin(max(90./65.*(Ice%lat(i,j)-pi/6.),-pi*0.5))**2) + TFREEZE
endif
endif
enddo
enddo
else if (sst_method == "aqua_planet_35N") then
ice_method = 'none'
Ice%ice_mask = .false.
do j = js, je
do i = is, ie
if (Ice%mask(i,j)) then
if (Ice%lat(i,j) > 7.*pi/36.) then
Ice%t_surf(i,j) = 27.*(1.-sin(min(90./55.*(Ice%lat(i,j)-7.*pi/36.),pi*0.5))**2) + TFREEZE
else
Ice%t_surf(i,j) = 27.*(1.-sin(max(90./65.*(Ice%lat(i,j)-7.*pi/36.),-pi*0.5))**2) + TFREEZE
endif
endif
enddo
enddo
else if (sst_method == "aqua_planet_40N") then
ice_method = 'none'
Ice%ice_mask = .false.
do j = js, je
do i = is, ie
if (Ice%mask(i,j)) then
if (Ice%lat(i,j) > 2.*pi/9.) then
Ice%t_surf(i,j) = 27.*(1.-sin(min(90./55.*(Ice%lat(i,j)-2.*pi/9.),pi*0.5))**2) + TFREEZE
else
Ice%t_surf(i,j) = 27.*(1.-sin(max(90./65.*(Ice%lat(i,j)-2.*pi/9.),-pi*0.5))**2) + TFREEZE
endif
endif
enddo
enddo
else if (sst_method == "aqua_planet_45N") then
ice_method = 'none'
Ice%ice_mask = .false.
do j = js, je
do i = is, ie
if (Ice%mask(i,j)) then
if (Ice%lat(i,j) > pi/4.) then
Ice%t_surf(i,j) = 27.*(1.-sin(min(90./55.*(Ice%lat(i,j)-pi/4.),pi*0.5))**2) + TFREEZE
else
Ice%t_surf(i,j) = 27.*(1.-sin(max(90./65.*(Ice%lat(i,j)-pi/4.),-pi*0.5))**2) + TFREEZE
endif
endif
enddo
enddo
else if (sst_method == "aqua_planet_50N") then
ice_method = 'none'
Ice%ice_mask = .false.
do j = js, je
do i = is, ie
if (Ice%mask(i,j)) then
if (Ice%lat(i,j) > 5.*pi/18.) then
Ice%t_surf(i,j) = 27.*(1.-sin(min(90./55.*(Ice%lat(i,j)-5.*pi/18.),pi*0.5))**2) + TFREEZE
else
Ice%t_surf(i,j) = 27.*(1.-sin(max(90./65.*(Ice%lat(i,j)-5.*pi/18.),-pi*0.5))**2) + TFREEZE
endif
endif
enddo
enddo
else if (sst_method == "aqua_planet_55N") then
ice_method = 'none'
Ice%ice_mask = .false.
do j = js, je
do i = is, ie
if (Ice%mask(i,j)) then
if (Ice%lat(i,j) > 11.*pi/36.) then
Ice%t_surf(i,j) = 27.*(1.-sin(min(90./55.*(Ice%lat(i,j)-11.*pi/36.),pi*0.5))**2) + TFREEZE
else
Ice%t_surf(i,j) = 27.*(1.-sin(max(90./65.*(Ice%lat(i,j)-11.*pi/36.),-pi*0.5))**2) + TFREEZE
endif
endif
enddo
enddo
else if (sst_method == "aqua_planet_60N") then
ice_method = 'none'
Ice%ice_mask = .false.
do j = js, je
do i = is, ie
if (Ice%mask(i,j)) then
if (Ice%lat(i,j) > pi/3.) then
Ice%t_surf(i,j) = 27.*(1.-sin(min(90./55.*(Ice%lat(i,j)-pi/3.),pi*0.5))**2) + TFREEZE
else
Ice%t_surf(i,j) = 27.*(1.-sin(max(90./65.*(Ice%lat(i,j)-pi/3.),-pi*0.5))**2) + TFREEZE
endif
endif
enddo
enddo
else if (sst_method == "aqua_planet_65N") then
ice_method = 'none'
Ice%ice_mask = .false.
do j = js, je
do i = is, ie
if (Ice%mask(i,j)) then
if (Ice%lat(i,j) > 13.*pi/36.) then
Ice%t_surf(i,j) = 27.*(1.-sin(min(90./55.*(Ice%lat(i,j)-13.*pi/36.),pi*0.5))**2) + TFREEZE
else
Ice%t_surf(i,j) = 27.*(1.-sin(max(90./65.*(Ice%lat(i,j)-13.*pi/36.),-pi*0.5))**2) + TFREEZE
endif
endif
enddo
enddo
else if (sst_method == "aqua_planet_70N") then
ice_method = 'none'
Ice%ice_mask = .false.
do j = js, je
do i = is, ie
if (Ice%mask(i,j)) then
if (Ice%lat(i,j) > 7.*pi/18.) then
Ice%t_surf(i,j) = 27.*(1.-sin(min(90./55.*(Ice%lat(i,j)-7.*pi/18.),pi*0.5))**2) + TFREEZE
else
Ice%t_surf(i,j) = 27.*(1.-sin(max(90./65.*(Ice%lat(i,j)-7.*pi/18.),-pi*0.5))**2) + TFREEZE