forked from metno/snap
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathreadfield_nc.f90
1013 lines (866 loc) · 30.6 KB
/
readfield_nc.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
! SNAP: Servere Nuclear Accident Programme
! Copyright (C) 1992-2017 Norwegian Meteorological Institute
! This file is part of SNAP. SNAP is free software: you can
! redistribute it and/or modify it under the terms of the
! GNU General Public License as published by the
! Free Software Foundation, either version 3 of the License, or
! (at your option) any later version.
! This program 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 General Public License
! along with this program. If not, see <https://www.gnu.org/licenses/>.
module readfield_ncML
USE ftestML, only: ftest
USE om2edotML, only: om2edot
USE milibML, only: mapfield
USE snaptabML, only: t2thetafac
USE netcdf
USE snapdebug, only: iulog, idebug
implicit none
private
public :: readfield_nc, check, nfcheckload, calc_2d_start_length, find_index
public :: compute_vertical_coords
interface nfcheckload
module procedure nfcheckload1d, nfcheckload2d, nfcheckload3d
end interface
contains
!..search in list of available timesteps with model level data
!> Next index to read from, ntav == 0 if no available meteo
integer function find_index(first, backward, itimei, ihr1, ihr2) result(ntav)
USE snapfilML, only: kavail, iavail
USE datetime, only: datetime_t, duration_t
!> Whether this is the first input (which ignores ihr1)
logical, intent(in) :: first
!> Calculate time backwards
logical, value :: backward
!> Last time of reading
type(datetime_t), intent(in) :: itimei
!> bounds in the age of the next time
integer, value :: ihr1, ihr2
integer :: current_index
type(datetime_t) :: test_date, itime(2)
if (first) then
ihr1 = 0
! Search opposite direction to find suitable initial fields
backward = .not.backward
endif
ntav = 0
!..search in list of available timesteps with model level data
if(.not.backward) then
current_index = kavail(1)
itime(1) = itimei + duration_t(ihr1)
itime(2) = itimei + duration_t(ihr2)
else
!..using the backward list
current_index = kavail(2)
itime(1) = itimei - duration_t(ihr1)
itime(2) = itimei - duration_t(ihr2)
end if
if (.not.backward) then
write(iulog,*) '*READFIELD* Requested time: ', itimei
write(iulog,*) ' Time limit: ', itime(1), itime(2)
else
write(iulog,*) '*READFIELD* Requested time: ', itimei
write(iulog,*) ' Time limit: ', itime(2), itime(1)
endif
do while (current_index > 0)
test_date = datetime_t(iavail(current_index)%aYear, &
iavail(current_index)%aMonth, &
iavail(current_index)%aDay, &
iavail(current_index)%aHour) + &
duration_t(iavail(current_index)%fcHour)
!..pointer to next timestep (possibly same time)
if (.not.backward) then
if (test_date >= itime(1) .and. test_date <= itime(2)) then
ntav = current_index
exit
endif
current_index = iavail(current_index)%nAvail
else
if (test_date <= itime(1) .and. test_date >= itime(2)) then
ntav = current_index
exit
endif
current_index = iavail(current_index)%pAvail
end if
end do
end function
!> Read fields from NetCDF files
subroutine readfield_nc(istep, backward, itimei, ihr1, ihr2, &
itimefi,ierror)
USE iso_fortran_env, only: error_unit
USE snapfilML, only: nctype, iavail, filef
USE snapfldML, only: &
xm, ym, u1, u2, v1, v2, w1, w2, t1, t2, ps1, ps2, pmsl1, pmsl2, &
hbl1, hbl2, hlayer1, hlayer2, garea, hlevel1, hlevel2, &
hlayer1, hlayer2, bl1, bl2, enspos, precip, &
t1_abs, t2_abs, field1
USE snapgrdML, only: alevel, blevel, vlevel, ahalf, bhalf, vhalf, &
gparam, kadd, klevel, ivlevel, imslp, igtype, ivlayer, ivcoor
USE snapmetML, only: met_params, requires_precip_deaccumulation
USE snapdimML, only: nx, ny, nk, output_resolution_factor, hres_field
USE datetime, only: datetime_t, duration_t
!> current timestep (always positive), negative istep means reset
integer, intent(in) :: istep
!> whether meteorology should be read backwards
logical, intent(in) :: backward
!> minimal time-offset after itimei
integer, intent(in) :: ihr1
!> maximal time-offset after itimei
integer, intent(in) :: ihr2
!> time since last file input
type(datetime_t), intent(in) :: itimei
!> final time (output)
type(datetime_t), intent(out) :: itimefi
!> error (output)
integer, intent(out) :: ierror
! local variables
integer, save :: ncid = 0
integer, save :: ntav1, ntav2 = 0
character(len=1024), save :: file_name = ""
logical, save :: first_time_read = .true.
integer :: i, j, k, ilevel, i1, i2
integer :: nhdiff, nhdiff_precip
real :: alev(nk), blev(nk), dxgrid, dygrid
integer :: kk
real :: dred, red, p, px, ptop
real :: ptoptmp(1)
integer :: prev_tstep_same_file
integer :: timepos, timeposm1
integer :: start3d(7), start4d(7), count3d(7), count4d(7)
ierror = 0
if (istep < 0) then
! set 'save' variables to default values,
! ncid not needed, will close automatically
ntav1 = 0
ntav2 = 0
end if
!..get time offset in hours (as iavail(n)%oHour)
ntav1 = ntav2
ntav2 = find_index(istep < 0, backward, itimei, ihr1, ihr2)
if(ntav2 == 0) then
write(iulog,*) '*READFIELD* No model level data available'
write(error_unit,*) '*READFIELD* No model level data available'
ierror=1
return
end if
if(idebug == 1) then
write(iulog,*) 'MODEL LEVEL SEARCH LIST. ntav2=',ntav2
write(iulog,*) 'nx,ny,nk: ',nx,ny,nk
write(iulog,*) 'istep: ',istep
write(iulog,*) 'itimei(5), ihr1, ihr2:',itimei,ihr1,ihr2
write(iulog,fmt='(7(1x,i4),1x,i6,2i5)') (iavail(ntav2))
flush(iulog)
end if
! time between two inputs
! open the correct file, if required
if (file_name /= filef(iavail(ntav2)%fileNo)) then
if (ncid /= 0) then
call check(nf90_close(ncid), "close ncid")
end if
file_name = filef(iavail(ntav2)%fileNo)
call check(nf90_open(file_name, NF90_NOWRITE, ncid), file_name)
end if
! set timepos and nhdiff
if (ntav1 /= 0) then
nhdiff = abs(iavail(ntav2)%oHour - iavail(ntav1)%oHour)
else
! Irrelevant time difference for the first timestep
nhdiff = 0
endif
timepos = iavail(ntav2)%timePos
timeposm1 = timepos ! Default: No deaccumulation possible
prev_tstep_same_file = iavail(ntav2)%pavail_same_file
if (prev_tstep_same_file /= 0) then
! previous timestep in same file for deaccumulation, even if not in list
timeposm1 = iavail(prev_tstep_same_file)%timePos
nhdiff_precip = abs(iavail(ntav2)%oHour - iavail(prev_tstep_same_file)%oHour)
else
if (.not.requires_precip_deaccumulation()) then
nhdiff_precip = 0
else
! Figure out if the next timestep belongs to the same forecast
if ((filef(ntav2+1) == filef(ntav2)) .and. (iavail(ntav2+1)%fchour == iavail(ntav2)%fchour)) then
nhdiff_precip = abs(iavail(ntav2+1)%oHour - iavail(ntav2)%oHour)
else
nhdiff_precip = nhdiff
if (nhdiff == 0) then
! Default in case nhdiff not set
nhdiff_precip = 3
endif
write(iulog,'("Deaccumulation of precipitation requires estimate of nhdiff, nhdiff=",I3,"hours")') nhdiff_precip
write(error_unit,'("Deaccumulation of precipitation requires estimate of nhdiff, nhdiff=",I3,"hours")') nhdiff_precip
endif
endif
endif
itimefi = datetime_t(iavail(ntav2)%aYear, &
iavail(ntav2)%aMonth, &
iavail(ntav2)%aDay, &
iavail(ntav2)%aHour)
itimefi = itimefi + duration_t(iavail(ntav2)%fcHour)
if(idebug == 1) then
write(iulog,*) 'READING DATA FROM file=',trim(file_name)
write(iulog,*) 'READING DATA FROM position=',timepos, ' for ', &
itimefi, ', prev. position=',timeposm1,', hours:',nhdiff
end if
if( .TRUE. ) then
!..move data from input time step 2 to 1
u1(:,:,:) = u2
v1(:,:,:) = v2
w1(:,:,:) = w2
t1(:,:,:) = t2
if (allocated(t2_abs)) t1_abs(:,:,:) = t2_abs
hlevel1(:,:,:) = hlevel2
hlayer1(:,:,:) = hlayer2
ps1(:,:) = ps2
bl1(:,:) = bl2
hbl1(:,:) = hbl2
if(imslp /= 0) then
pmsl1(:,:) = pmsl2
end if
end if
ptop = 100.0
do k=nk-kadd,2,-1
!..input model level no.
ilevel=klevel(k)
! dummy-dim only on 2d
call calc_2d_start_length(start4d, count4d, nx, ny, ilevel, &
enspos, timepos, has_2d_dummy_height=.false.)
!..u
! Get the varid of the data variable, based on its name.
call nfcheckload(ncid, met_params%xwindv, start4d, count4d, u2(:,:,k))
!..v
call nfcheckload(ncid, met_params%ywindv, start4d, count4d, v2(:,:,k))
! bug in chernobyl borders from destaggering
where (v2 >= 1e+30)
v2 = 0.0
end where
!..pot.temp. or abs.temp.
call nfcheckload(ncid, met_params%pottempv, start4d, count4d, t2(:,:,k))
! TODO read ptop from file (only needed for sigma), but not in emep data
ptop=100.
! if(ivcoor.eq.2) ptop=idata(19)
!..p0 for hybrid loaded to ptop, ap is a * p0
if (ivcoor /= 2 .AND. .NOT. met_params%ptopv == '') then
call nfcheckload(ncid, met_params%ptopv, (/0/), (/1/), ptoptmp)
ptop = ptoptmp(1)
end if
!..alevel (here) only for eta levels
if ( .NOT. met_params%apv == '') then
call nfcheckload(ncid, met_params%apv, (/ilevel/), (/1/), alev(k:k))
call nfcheckload(ncid, met_params%bv, (/ilevel/), (/1/), blev(k:k))
if (ivcoor /= 2 .AND. .NOT. met_params%ptopv == '') then
!..p0 for hybrid loaded to ptop, ap is a * p0
alev(k) = alev(k) * ptop
end if
! TODO: check unit (here Pa -> hPa
alev(k) = alev(k) / 100
end if
if ( .NOT. met_params%sigmav == '') then
! reusing blev(k) for sigma(k) later
call nfcheckload(ncid, met_params%sigmav, (/ilevel/), (/1/), blev(k:k))
end if
!..sigma_dot/eta_dot (0 at surface)
!..eta: eta_dot (or omega) stored in the same levels as u,v,th.
if (met_params%sigmadotv == '') then
w2 = 0
else
call nfcheckload(ncid, met_params%sigmadotv, &
start4d, count4d, w2(:,:,k))
end if
end do ! k=nk-kadd,2,-1
!..surface pressure, 10m wind and possibly mean sea level pressure,
!..precipitation
call calc_2d_start_length(start3d, count3d, nx, ny, -1, &
enspos, timepos, met_params%has_dummy_dim)
! ps
call nfcheckload(ncid, met_params%psv, start3d, count3d, ps2(:,:))
! input ps, must be hPa, otherwise:
if (nctype == 'arome' .OR. nctype == 'dmi_eps' .OR. &
nctype == 'ec_det' .OR. nctype == 'h12_grib' .OR. &
nctype == "SLIM" .OR. &
nctype == 'gfs_grib_filter_fimex') then
ps2 = ps2*0.01
endif
! u10m
! v10m
if (.not.met_params%use_model_wind_for_10m) then
call nfcheckload(ncid, met_params%xwind10mv, start3d, count3d, u2(:,:,1))
call nfcheckload(ncid, met_params%ywind10mv, start3d, count3d, v2(:,:,1))
else
if (enspos >= 0) then
call nfcheckload(ncid, met_params%xwindv, [1, 1, enspos+1, nk, timepos], &
[nx, ny, 1, 1, 1], u2(:,:,1))
call nfcheckload(ncid, met_params%ywindv, [1, 1, enspos+1, nk, timepos], &
[nx, ny, 1, 1, 1], v2(:,:,1))
else
call nfcheckload(ncid, met_params%xwindv, [1, 1, nk, timepos], &
[nx, ny, 1, 1], u2(:,:,1))
call nfcheckload(ncid, met_params%ywindv, [1, 1, nk, timepos], &
[nx, ny, 1, 1], v2(:,:,1))
endif
endif
!..mean sea level pressure, not used in computations,
!..(only for output to results file)
if(imslp /= 0) then
if ( .NOT. met_params%mslpv == '') then
write(iulog,*) 'Mslp not found. Not important.'
imslp=0
else
call nfcheckload(ncid, met_params%mslpv, start3d, count3d, pmsl2(:,:))
end if
end if
if (met_params%need_precipitation) then
call read_precipitation(ncid, nhdiff_precip, timepos, timeposm1)
else
precip = 0.0
endif
! first time initialized data
if (first_time_read) then
first_time_read = .false.
call compute_vertical_coords(alev, blev, ptop)
!..compute map ratio
call mapfield(1,0,igtype,gparam,nx,ny,xm,ym,&
xm, & ! Ignored when icori = 0
dxgrid,dygrid,ierror)
if(ierror /= 0) then
write(iulog,*) 'MAPFIELD ERROR. ierror= ',ierror
write(error_unit,*) 'MAPFIELD ERROR. ierror= ',ierror
error stop 255
end if
gparam(7)=dxgrid
gparam(8)=dygrid
!..set garea size of each grid square (m**2) in output grid-size
field1 = abs((dxgrid/xm)*(dygrid/ym)) / (output_resolution_factor*output_resolution_factor)
call hres_field(field1, garea, .true.)
! end initialization
end if
if (met_params%temp_is_abs) then
if (allocated(t2_abs)) t2_abs(:,:,:) = t2
!..abs.temp. -> pot.temp.
do k=2,nk-kadd
do j = 1, ny
do i = 1, nx
p = alevel(k) + blevel(k)*ps2(i,j)
t2(i,j,k) = t2(i,j,k)*t2thetafac(p)
end do
end do
end do
else
if (allocated(t2_abs)) then
! pot.temp -> abs.temp
do k=2,nk-kadd
do j = 1, ny
do i = 1, nx
p = alevel(k) + blevel(k)*ps2(i,j)
t2_abs(i,j,k) = t2(i,j,k)/t2thetafac(p)
end do
end do
end do
endif
end if
if (met_params%sigmadot_is_omega) then
!..omega -> etadot, or rather etadot derived from continuity-equation (mean of both)
call om2edot
else if (met_params%sigmadotv == '') then
!..omega -> etadot, or rather etadot derived from continuity-equation
call om2edot
! om2edot take means of omega (=0) and continuity-equation, -> use only continuity equation
w2 = 2.0*w2
end if
!..sigma_dot/eta_dot 0 at surface
w2(:,:,1) = 0.0
!..no temperature at or near surface (not used, yet)
t2(:,:,1) = -999.0
if(kadd > 0) then
!..levels added at the top
dred=0.5/float(kadd)
red=1.
kk=nk-kadd
do k=nk-kadd+1,nk
red=red-dred
u2(:,:,k) = u2(:,:,kk)
v2(:,:,k) = v2(:,:,kk)
w2(:,:,k) = w2(:,:,kk)*red
t2(:,:,k) = t2(:,:,kk)
end do
end if
if(backward) then
! backward-calculation, switch sign of winds
u2 = -u2
v2 = -v2
w2 = -w2
end if
! test---------------------------------------------------------------
write(iulog,*) 'k,k_model,alevel,blevel,vlevel,p,dp:'
px=alevel(nk)+blevel(nk)*1000.
do k=nk,1,-1
p=alevel(k)+blevel(k)*1000.
write(iulog,fmt='(1x,2i5,f9.2,2f9.5,f8.0,f6.0)') &
k,klevel(k),alevel(k),blevel(k),vlevel(k),p,p-px
px=p
end do
! test---------------------------------------------------------------
if(idebug == 1) then
call ftest('u ', u2, reverse_third_dim=.true.)
call ftest('v ', v2, reverse_third_dim=.true.)
call ftest('w ', w2, reverse_third_dim=.true.)
call ftest('t ', t2, reverse_third_dim=.true.)
call ftest('ps ', ps2)
if (istep > 0) &
call ftest('pre', precip(:,:))
end if
if (istep == 0) then
! test---------------------------------------------------------------
write(iulog,*) 'k,ahalf,bhalf,vhalf,p,dp:'
px=ahalf(nk)+bhalf(nk)*1000.
do k=nk,1,-1
p=ahalf(k)+bhalf(k)*1000.
write(iulog,fmt='(1x,i5,f9.2,2f9.5,f8.0,f6.0)') &
k,ahalf(k),bhalf(k),vhalf(k),p,p-px
px=p
end do
! test---------------------------------------------------------------
!..level table for (vertical) interpolation
!..(remember that fields are stored bottom to top
!.. and that all parameters now are in the same levels)
write(iulog,*) 'ivlevel:'
write(iulog,*) 'k,i1,i2,vlevel(k+1),vlevel(k)'
i2=-1
do k=nk-1,1,-1
i1=i2+1
i2=vlevel(k)*10000.
if(k == 1) i2=10000
do i=i1,i2
ivlevel(i)=k
end do
write(iulog,*) k,i1,i2,vlevel(k+1),vlevel(k)
end do
!..level table for concentration in each sigma/eta layer
!..(layers here as in the input model, no '10m' layer,
!.. but ordering bottom to top, reorder at time of output)
write(iulog,*) 'ivlayer:'
write(iulog,*) 'k,i1,i2,vhalf(k+1),vhalf(k)'
i2=-1
do k=nk-1,1,-1
i1=i2+1
i2=nint(vhalf(k)*10000.)
if(k == 1) i2=10000
do i=i1,i2
ivlayer(i)=k
end do
write(iulog,*) k,i1,i2,vhalf(k+1),vhalf(k)
end do
end if
return
end subroutine readfield_nc
!> Reads `units` attribute of the precipitation variable
subroutine read_precip_unit_scale(ncid, varname, unitScale)
use snapmetML, only: precip_units, precip_units_fallback
integer, intent(in) :: ncid
character(len=*), intent(in) :: varname
!> Scaling factor to multiply input value to obtain the value
!> in model units
!> Defaults to 1.0 on error on reading the netCDF file
real, intent(out) :: unitScale
integer :: attr_len
character(len=:), allocatable :: attr
integer :: varid
integer :: nferr
unitScale = 1.0
nferr = nf90_inq_varid(ncid, varname, varid)
if (nferr /= NF90_NOERR) return
nferr = nf90_inquire_attribute(ncid, varid, "units", len=attr_len)
if (nferr /= NF90_NOERR) return
allocate(character(len=attr_len) :: attr)
nferr = nf90_get_att(ncid, varid, "units", attr)
if (nferr /= NF90_NOERR) return
select case (attr)
case ("m")
unitScale = 1000.0
case (precip_units, precip_units_fallback)
unitScale = 1.0
end select
end subroutine
!> read precipitation
subroutine read_precipitation(ncid, nhdiff, timepos, timeposm1)
use iso_fortran_env, only: error_unit
use snapdebug, only: iulog
use snapmetML, only: met_params
use snapfldML, only: field1, field2, field3, field4, precip, &
enspos
use snapdimML, only: nx, ny
USE snapfilML, only: nctype
!> open netcdf file
integer, intent(in) :: ncid
!> time difference in hours between two precip fields
integer, intent(in) :: nhdiff
!> timestep in file
integer, intent(in) :: timepos
!> previous timestep
integer, intent(in) :: timeposm1
integer :: start3d(7), count3d(7)
real :: unitScale
real :: totalprec
if (met_params%precaccumv /= '') then
!..precipitation between input time 't1' and 't2'
if (timepos == 1) then
! Can not deaccumulate using this file only,
! assume first timestep is accumulated from start of run
field1 = 0.0
else
call calc_2d_start_length(start3d, count3d, nx, ny, -1, &
enspos, timeposm1, met_params%has_dummy_dim)
call nfcheckload(ncid, met_params%precaccumv, &
start3d, count3d, field1(:,:))
endif
call calc_2d_start_length(start3d, count3d, nx, ny, -1, &
enspos, timepos, met_params%has_dummy_dim)
call nfcheckload(ncid, met_params%precaccumv, &
start3d, count3d, field2(:,:))
precip(:, :) = (field2 - field1)/nhdiff
else if (met_params%precstratiaccumv /= '') then
! accumulated stratiform and convective precipitation
!..precipitation between input time 't1' and 't2'
call calc_2d_start_length(start3d, count3d, nx, ny, -1, &
enspos, timepos, met_params%has_dummy_dim)
call nfcheckload(ncid, met_params%precstratiaccumv, &
start3d, count3d, field3)
call nfcheckload(ncid, met_params%precconaccumv, &
start3d, count3d, field4)
if (timepos /= 1) then
call calc_2d_start_length(start3d, count3d, nx, ny, -1, &
enspos, timeposm1, met_params%has_dummy_dim)
call nfcheckload(ncid, met_params%precstratiaccumv, &
start3d, count3d, field1)
call nfcheckload(ncid, met_params%precconaccumv, &
start3d, count3d, field2)
else
! assuming empty 0 timestep to deaccumulate precip"
field1 = 0.0
field2 = 0.0
totalprec = sum(field3) + sum(field4)
if (totalprec > 1e-5) then
write(iulog,*) "found precip in first timestep, assuming ", &
"empty 0 timestep to deaccumulate precip"
endif
endif
call read_precip_unit_scale(ncid, met_params%precstratiaccumv, unitScale)
precip(:,:) = (field3 + field4) - (field1 + field2)
precip(:,:) = precip/nhdiff*unitScale
else if (met_params%total_column_rain /= '') then
call calc_2d_start_length(start3d, count3d, nx, ny, 1, &
enspos, timepos, met_params%has_dummy_dim)
call nfcheckload(ncid, met_params%total_column_rain, &
start3d, count3d, field3)
precip(:,:) = field3
write(error_unit, *) "Check precipation correctness"
else
!..non-accumulated emissions in stratiform and convective
call calc_2d_start_length(start3d, count3d, nx, ny, -1, &
enspos, timepos, met_params%has_dummy_dim)
call nfcheckload(ncid, met_params%precstrativrt, &
start3d, count3d, field1(:,:))
if (met_params%precconvrt /= '') then
call nfcheckload(ncid, met_params%precconvrt, &
start3d, count3d, field2(:,:))
else
field2 = 0.
endif
unitScale = 3600.*1000.0 ! m/s -> mm/h
if (nctype == 'gfs_grib_filter_fimex') unitScale = 3600. !kg/m3/s -> mm/h
precip(:,:) = (field1 + field2)*unitScale
end if
where (precip < 0.0)
precip = 0.0
end where
end subroutine
!> calculate the start and length paramters for slicing
!> a 2d field from a 3-5d dataset
subroutine calc_2d_start_length(start, length, nx, ny, zpos, &
enspos, tpos, has_2d_dummy_height)
!> Offset into field
integer, intent (out) :: start(7)
!> Length of each field
integer, intent(out) :: length(7)
!> size (x) of field
integer, intent (in) :: nx
!> size (y) of field
integer, intent(in) :: ny
!> hybrid position
integer, intent(in) :: zpos
!> ensemble member, should be given in C notation,
!> with 0 being the first member. Setting to a negative
!> value disables this.
integer, intent(in) :: enspos
!> time on which to compute
integer, intent(in) :: tpos
!> if set to true, an empty dimension (size 1) has been used
!> for height. Ignored if \p zpos >= 1
logical, intent (in) :: has_2d_dummy_height
integer :: pos
start = 1
length = 1
length(1) = nx
length(2) = ny
pos = 2
! ensemble enspos given in C notation, e.g. first member = 0
if (enspos >= 0) then
pos = pos + 1
start(pos) = enspos+1
end if
! z
if (zpos >= 1) then
pos = pos + 1
start(pos) = zpos
elseif (has_2d_dummy_height) then
pos = pos + 1
end if
! time
pos = pos + 1
start(pos) = tpos
end subroutine calc_2d_start_length
subroutine check(status, errmsg)
use ISO_FORTRAN_ENV, only: OUTPUT_UNIT, ERROR_UNIT
use snapdebug, only: iulog, idebug
integer, intent ( in) :: status
character(len=*), intent(in), optional :: errmsg
if(status /= NF90_NOERR) then
if (present(errmsg)) then
write(OUTPUT_UNIT,*) trim(nf90_strerror(status)), ": ", trim(errmsg)
write(ERROR_UNIT,*) trim(nf90_strerror(status)), ": ", trim(errmsg)
if (idebug == 1) write(iulog,*) trim(nf90_strerror(status)), ": ", trim(errmsg)
else
write(OUTPUT_UNIT, *) trim(nf90_strerror(status))
write(ERROR_UNIT, *) trim(nf90_strerror(status))
if (idebug == 1) write(iulog, *) trim(nf90_strerror(status))
endif
error stop 1
endif
end subroutine check
subroutine fillscaleoffset(ncid, varid, fillvalue, scalefactor, offset, status)
use iso_fortran_env, only: real32
integer, intent(in) :: ncid, varid
real(kind=real32), intent(out) :: fillvalue, scalefactor, offset
integer, intent(out) :: status
status = nf90_get_att(ncid, varid, "_FillValue", fillvalue)
if (status == NF90_ENOTATT) then
fillvalue = NF90_FILL_FLOAT
else if (status /= NF90_NOERR) then
return
endif
status = nf90_get_att(ncid, varid, "scale_factor", scalefactor)
if (status == NF90_ENOTATT) then
scalefactor = 1
else if (status /= NF90_NOERR) then
return
endif
status = nf90_get_att(ncid, varid, "add_offset", offset)
if (status == NF90_ENOTATT) then
offset = 0
status = NF90_NOERR
else if (status /= NF90_NOERR) then
return
endif
end subroutine fillscaleoffset
subroutine nfcheckload1d(ncid, varname, start, length, field, return_status)
use ieee_arithmetic, only: ieee_value, IEEE_QUIET_NAN
use iso_fortran_env, only: real32
integer, intent(in) :: ncid, start(:), length(:)
character(len=*), intent(in) :: varname
real(real32), intent(out) :: field(:)
!> Return status instead of panic
integer, intent(out), optional :: return_status
real(real32) :: factor, offset, fillvalue
integer :: varid, status
if (present(return_status)) return_status = NF90_NOERR
status = nf90_inq_varid(ncid, varname, varid)
if (status /= NF90_NOERR .and. present(return_status)) then
return_status = status
return
endif
call check(status, varname)
write (iulog,*) "reading "//trim(varname)//", dims: ", "start(1):",start, " size:",length
status = nf90_get_var(ncid, varid, field, start=start, count=length)
if (status /= NF90_NOERR .and. present(return_status)) then
return_status = status
return
endif
call check(status, varname)
call fillscaleoffset(ncid, varid, fillvalue, factor, offset, status)
if (status /= NF90_NOERR .and. present(return_status)) then
return_status = status
return
endif
call check(status)
where (field == fillvalue)
field = IEEE_VALUE(fillvalue, IEEE_QUIET_NAN)
end where
if (factor /= 1. .OR. offset /= 0.) then
field = field*factor + offset
end if
end subroutine nfcheckload1d
subroutine nfcheckload2d(ncid, varname, start, length, field, return_status)
use ieee_arithmetic, only: ieee_value, IEEE_QUIET_NAN
use iso_fortran_env, only: real32
integer, intent(in) :: ncid, start(:), length(:)
character(len=*), intent(in) :: varname
real(real32), intent(out) :: field(:,:)
!> Return status instead of panic
integer, intent(out), optional :: return_status
real(real32) :: factor, offset, fillvalue
integer :: varid, status
if (present(return_status)) return_status = NF90_NOERR
status = nf90_inq_varid(ncid, varname, varid)
if (status /= NF90_NOERR .and. present(return_status)) then
return_status = status
return
endif
call check(status, varname)
write (iulog,*) "reading "//trim(varname)//", dims: ", "start(1):",start, " size:",length
status = nf90_get_var(ncid, varid, field, start=start, count=length)
if (status /= NF90_NOERR .and. present(return_status)) then
return_status = status
return
endif
call check(status, varname)
call fillscaleoffset(ncid, varid, fillvalue, factor, offset, status)
if (status /= NF90_NOERR .and. present(return_status)) then
return_status = status
return
endif
call check(status)
where (field == fillvalue)
field = IEEE_VALUE(fillvalue, IEEE_QUIET_NAN)
end where
if (factor /= 1. .OR. offset /= 0.) then
field = field*factor + offset
end if
end subroutine nfcheckload2d
subroutine nfcheckload3d(ncid, varname, start, length, field, return_status)
use ieee_arithmetic, only: ieee_value, IEEE_QUIET_NAN
use iso_fortran_env, only: real32
integer, intent(in) :: ncid, start(:), length(:)
character(len=*), intent(in) :: varname
real(real32), intent(out) :: field(:,:,:)
!> Return status instead of panic
integer, intent(out), optional :: return_status
real(real32) :: factor, offset, fillvalue
integer :: varid, status
if (present(return_status)) return_status = NF90_NOERR
status = nf90_inq_varid(ncid, varname, varid)
if (status /= NF90_NOERR .and. present(return_status)) then
return_status = status
return
endif
call check(status, varname)
write (iulog,*) "reading "//trim(varname)//", dims: ", "start(1):",start, " size:",length
status = nf90_get_var(ncid, varid, field, start=start, count=length)
if (status /= NF90_NOERR .and. present(return_status)) then
return_status = status
return
endif
call check(status, varname)
call fillscaleoffset(ncid, varid, fillvalue, factor, offset, status)
if (status /= NF90_NOERR .and. present(return_status)) then
return_status = status
return
endif
call check(status)
where (field == fillvalue)
field = IEEE_VALUE(fillvalue, IEEE_QUIET_NAN)
end where
if (factor /= 1. .OR. offset /= 0.) then
field = field*factor + offset
end if
end subroutine nfcheckload3d
subroutine compute_vertical_coords(alev, blev, ptop)
use iso_fortran_env, only: error_unit
use snapgrdML, only: alevel, blevel, vlevel, ivcoor, klevel, kadd, &
ahalf, bhalf, vhalf
use snapmetML, only: met_params
use snapdimML, only: nk
use snaptabML, only: standard_atmosphere
real, intent(in) :: alev(:)
real, intent(in) :: blev(:)
real, intent(in) :: ptop
real :: db, dp, p1, p2
integer :: k
do k = 2, nk - kadd
alevel(k) = alev(k)
blevel(k) = blev(k)
end do
if (kadd > 0) then
if (ivcoor == 2) then
!..sigma levels ... blevel=sigma
db = blevel(nk - kadd - 1) - blevel(nk - kadd)
db = max(db, blevel(nk - kadd)/float(kadd))
do k = nk - kadd + 1, nk
blevel(k) = max(blevel(k - 1) - db, 0.)
end do
elseif (ivcoor == 10) then
!..eta (hybrid) levels
p1 = alevel(nk - kadd) + blevel(nk - kadd)*1000.
p2 = alevel(nk - kadd - 1) + blevel(nk - kadd - 1)*1000.
dp = p2 - p1
if (p1 - dp*kadd < 10.) dp = (p1 - 10.)/kadd
db = blevel(nk - kadd - 1) - blevel(nk - kadd)
db = max(db, blevel(nk - kadd)/float(kadd))
do k = nk - kadd + 1, nk
p1 = p1 - dp
blevel(k) = max(blevel(k - 1) - db, 0.)
alevel(k) = p1 - blevel(k)*1000.
end do
else
write (error_unit, *) 'PROGRAM ERROR. ivcoor= ', ivcoor
error stop 255
end if
end if
if (ivcoor == 2) then
!..sigma levels (norlam)
do k = 2, nk
alevel(k) = ptop*(1.-blevel(k))
end do
end if
!..surface
alevel(1) = 0.0
blevel(1) = 1.0
if (ivcoor == 2) then
!..sigma levels ... vlevel=sigma
vlevel(:) = blevel
elseif (ivcoor == 10) then
!..eta (hybrid) levels ... vlevel=eta (eta as defined in Hirlam)
vlevel(:) = alevel/standard_atmosphere + blevel
else
write (error_unit, *) 'PROGRAM ERROR. ivcoor= ', ivcoor
error stop 255
end if
!..half levels where height is found,
!..alevel and blevel are in the middle of each layer
ahalf(1) = alevel(1)
bhalf(1) = blevel(1)
vhalf(1) = vlevel(1)
!..check if subselection of levels
do k = 2, nk - 1
if (klevel(k + 1) /= klevel(k) - 1) then
met_params%manual_level_selection = .TRUE.
endif
end do
do k = 2, nk - 1
if (.NOT. met_params%manual_level_selection) then
ahalf(k) = alevel(k) + (alevel(k) - ahalf(k - 1))
bhalf(k) = blevel(k) + (blevel(k) - bhalf(k - 1))