Newer
Older
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
MODULE geo2ocean
!!======================================================================
!! *** MODULE geo2ocean ***
!! Ocean mesh : ???
!!======================================================================
!! History : OPA ! 07-1996 (O. Marti) Original code
!! NEMO 1.0 ! 06-2006 (G. Madec ) Free form, F90 + opt.
!! ! 04-2007 (S. Masson) angle: Add T, F points and bugfix in cos lateral boundary
!! 3.0 ! 07-2008 (G. Madec) geo2oce suppress lon/lat agruments
!! 3.7 ! 11-2015 (G. Madec) remove the unused repere and repcmo routines
!!----------------------------------------------------------------------
!!----------------------------------------------------------------------
!! rot_rep : Rotate the Repere: geographic grid <==> stretched coordinates grid
!! angle :
!! geo2oce :
!! oce2geo :
!!----------------------------------------------------------------------
USE dom_oce ! mesh and scale factors
USE phycst ! physical constants
!
USE in_out_manager ! I/O manager
USE lbclnk ! ocean lateral boundary conditions (or mpp link)
USE lib_mpp ! MPP library
IMPLICIT NONE
PRIVATE
PUBLIC rot_rep ! called in sbccpl, fldread, and cyclone
PUBLIC geo2oce ! called in sbccpl
PUBLIC oce2geo ! called in sbccpl
PUBLIC obs_rot ! called in obs_rot_vel and obs_write
! ! cos/sin between model grid lines and NP direction
REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: gsint, gcost ! at T point
REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: gsinu, gcosu ! at U point
REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: gsinv, gcosv ! at V point
REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: gsinf, gcosf ! at F point
LOGICAL , SAVE, DIMENSION(4) :: linit = .FALSE.
REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: gsinlon, gcoslon, gsinlat, gcoslat
LOGICAL :: lmust_init = .TRUE. !: used to initialize the cos/sin variables (see above)
!! * Substitutions
# include "do_loop_substitute.h90"
!!----------------------------------------------------------------------
!! NEMO/OCE 4.0 , NEMO Consortium (2018)
!! $Id: geo2ocean.F90 14433 2021-02-11 08:06:49Z smasson $
!! Software governed by the CeCILL license (see ./LICENSE)
!!----------------------------------------------------------------------
CONTAINS
SUBROUTINE rot_rep ( pxin, pyin, cd_type, cdtodo, prot )
!!----------------------------------------------------------------------
!! *** ROUTINE rot_rep ***
!!
!! ** Purpose : Rotate the Repere: Change vector componantes between
!! geographic grid <--> stretched coordinates grid.
!!----------------------------------------------------------------------
REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pxin, pyin ! vector componantes
CHARACTER(len=1), INTENT(in ) :: cd_type ! define the nature of pt2d array grid-points
CHARACTER(len=5), INTENT(in ) :: cdtodo ! type of transpormation:
! ! 'en->i' = east-north to i-component
! ! 'en->j' = east-north to j-component
! ! 'ij->e' = (i,j) components to east
! ! 'ij->n' = (i,j) components to north
REAL(wp), DIMENSION(jpi,jpj), INTENT( out) :: prot
!!----------------------------------------------------------------------
!
IF( lmust_init ) THEN ! at 1st call only: set gsin. & gcos.
IF(lwp) WRITE(numout,*)
IF(lwp) WRITE(numout,*) ' rot_rep: coordinate transformation : geographic <==> model (i,j)-components'
IF(lwp) WRITE(numout,*) ' ~~~~~~~~ '
!
CALL angle( glamt, gphit, glamu, gphiu, glamv, gphiv, glamf, gphif ) ! initialization of the transformation
lmust_init = .FALSE.
ENDIF
!
SELECT CASE( cdtodo ) ! type of rotation
!
CASE( 'en->i' ) ! east-north to i-component
SELECT CASE (cd_type)
CASE ('T') ; prot(:,:) = pxin(:,:) * gcost(:,:) + pyin(:,:) * gsint(:,:)
CASE ('U') ; prot(:,:) = pxin(:,:) * gcosu(:,:) + pyin(:,:) * gsinu(:,:)
CASE ('V') ; prot(:,:) = pxin(:,:) * gcosv(:,:) + pyin(:,:) * gsinv(:,:)
CASE ('F') ; prot(:,:) = pxin(:,:) * gcosf(:,:) + pyin(:,:) * gsinf(:,:)
CASE DEFAULT ; CALL ctl_stop( 'Only T, U, V and F grid points are coded' )
END SELECT
CASE ('en->j') ! east-north to j-component
SELECT CASE (cd_type)
CASE ('T') ; prot(:,:) = pyin(:,:) * gcost(:,:) - pxin(:,:) * gsint(:,:)
CASE ('U') ; prot(:,:) = pyin(:,:) * gcosu(:,:) - pxin(:,:) * gsinu(:,:)
CASE ('V') ; prot(:,:) = pyin(:,:) * gcosv(:,:) - pxin(:,:) * gsinv(:,:)
CASE ('F') ; prot(:,:) = pyin(:,:) * gcosf(:,:) - pxin(:,:) * gsinf(:,:)
CASE DEFAULT ; CALL ctl_stop( 'Only T, U, V and F grid points are coded' )
END SELECT
CASE ('ij->e') ! (i,j)-components to east
SELECT CASE (cd_type)
CASE ('T') ; prot(:,:) = pxin(:,:) * gcost(:,:) - pyin(:,:) * gsint(:,:)
CASE ('U') ; prot(:,:) = pxin(:,:) * gcosu(:,:) - pyin(:,:) * gsinu(:,:)
CASE ('V') ; prot(:,:) = pxin(:,:) * gcosv(:,:) - pyin(:,:) * gsinv(:,:)
CASE ('F') ; prot(:,:) = pxin(:,:) * gcosf(:,:) - pyin(:,:) * gsinf(:,:)
CASE DEFAULT ; CALL ctl_stop( 'Only T, U, V and F grid points are coded' )
END SELECT
CASE ('ij->n') ! (i,j)-components to north
SELECT CASE (cd_type)
CASE ('T') ; prot(:,:) = pyin(:,:) * gcost(:,:) + pxin(:,:) * gsint(:,:)
CASE ('U') ; prot(:,:) = pyin(:,:) * gcosu(:,:) + pxin(:,:) * gsinu(:,:)
CASE ('V') ; prot(:,:) = pyin(:,:) * gcosv(:,:) + pxin(:,:) * gsinv(:,:)
CASE ('F') ; prot(:,:) = pyin(:,:) * gcosf(:,:) + pxin(:,:) * gsinf(:,:)
CASE DEFAULT ; CALL ctl_stop( 'Only T, U, V and F grid points are coded' )
END SELECT
CASE DEFAULT ; CALL ctl_stop( 'rot_rep: Syntax Error in the definition of cdtodo' )
!
END SELECT
!
END SUBROUTINE rot_rep
SUBROUTINE angle( plamt, pphit, plamu, pphiu, plamv, pphiv, plamf, pphif )
!!----------------------------------------------------------------------
!! *** ROUTINE angle ***
!!
!! ** Purpose : Compute angles between model grid lines and the North direction
!!
!! ** Method : sinus and cosinus of the angle between the north-south axe
!! and the j-direction at t, u, v and f-points
!! dot and cross products are used to obtain cos and sin, resp.
!!
!! ** Action : - gsint, gcost, gsinu, gcosu, gsinv, gcosv, gsinf, gcosf
!!----------------------------------------------------------------------
! WARNING: for an unexplained reason, we need to pass all glam, gphi arrays as input parameters in
! order to get AGRIF working with -03 compilation option
REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: plamt, pphit, plamu, pphiu, plamv, pphiv, plamf, pphif
!
INTEGER :: ji, jj ! dummy loop indices
INTEGER :: ierr ! local integer
REAL(wp) :: zlam, zphi ! local scalars
REAL(wp) :: zlan, zphh ! - -
REAL(wp) :: zxnpt, zynpt, znnpt ! x,y components and norm of the vector: T point to North Pole
REAL(wp) :: zxnpu, zynpu, znnpu ! x,y components and norm of the vector: U point to North Pole
REAL(wp) :: zxnpv, zynpv, znnpv ! x,y components and norm of the vector: V point to North Pole
REAL(wp) :: zxnpf, zynpf, znnpf ! x,y components and norm of the vector: F point to North Pole
REAL(wp) :: zxvvt, zyvvt, znvvt ! x,y components and norm of the vector: between V points below and above a T point
REAL(wp) :: zxffu, zyffu, znffu ! x,y components and norm of the vector: between F points below and above a U point
REAL(wp) :: zxffv, zyffv, znffv ! x,y components and norm of the vector: between F points left and right a V point
REAL(wp) :: zxuuf, zyuuf, znuuf ! x,y components and norm of the vector: between U points below and above a F point
!!----------------------------------------------------------------------
!
ALLOCATE( gsint(jpi,jpj), gcost(jpi,jpj), &
& gsinu(jpi,jpj), gcosu(jpi,jpj), &
& gsinv(jpi,jpj), gcosv(jpi,jpj), &
& gsinf(jpi,jpj), gcosf(jpi,jpj), STAT=ierr )
CALL mpp_sum( 'geo2ocean', ierr )
IF( ierr /= 0 ) CALL ctl_stop( 'angle: unable to allocate arrays' )
!
! ============================= !
! Compute the cosinus and sinus !
! ============================= !
! (computation done on the north stereographic polar plane)
!
DO_2D( 0, 1, 0, 0 )
!
zlam = plamt(ji,jj) ! north pole direction & modulous (at t-point)
zphi = pphit(ji,jj)
zxnpt = 0._wp- 2._wp* COS( rad*zlam ) * TAN( rpi/4._wp- rad*zphi/2._wp)
zynpt = 0._wp- 2._wp* SIN( rad*zlam ) * TAN( rpi/4._wp- rad*zphi/2._wp)
znnpt = zxnpt*zxnpt + zynpt*zynpt
!
zlam = plamu(ji,jj) ! north pole direction & modulous (at u-point)
zphi = pphiu(ji,jj)
zxnpu = 0._wp- 2._wp* COS( rad*zlam ) * TAN( rpi/4._wp- rad*zphi/2._wp)
zynpu = 0._wp- 2._wp* SIN( rad*zlam ) * TAN( rpi/4._wp- rad*zphi/2._wp)
znnpu = zxnpu*zxnpu + zynpu*zynpu
!
zlam = plamv(ji,jj) ! north pole direction & modulous (at v-point)
zphi = pphiv(ji,jj)
zxnpv = 0._wp- 2._wp* COS( rad*zlam ) * TAN( rpi/4._wp- rad*zphi/2._wp)
zynpv = 0._wp- 2._wp* SIN( rad*zlam ) * TAN( rpi/4._wp- rad*zphi/2._wp)
znnpv = zxnpv*zxnpv + zynpv*zynpv
!
zlam = plamf(ji,jj) ! north pole direction & modulous (at f-point)
zphi = pphif(ji,jj)
zxnpf = 0._wp- 2._wp* COS( rad*zlam ) * TAN( rpi/4._wp- rad*zphi/2._wp)
zynpf = 0._wp- 2._wp* SIN( rad*zlam ) * TAN( rpi/4._wp- rad*zphi/2._wp)
znnpf = zxnpf*zxnpf + zynpf*zynpf
!
zlam = plamv(ji,jj ) ! j-direction: v-point segment direction (around t-point)
zphi = pphiv(ji,jj )
zlan = plamv(ji,jj-1)
zphh = pphiv(ji,jj-1)
zxvvt = 2._wp* COS( rad*zlam ) * TAN( rpi/4._wp- rad*zphi/2._wp) &
& - 2._wp* COS( rad*zlan ) * TAN( rpi/4._wp- rad*zphh/2._wp)
zyvvt = 2._wp* SIN( rad*zlam ) * TAN( rpi/4._wp- rad*zphi/2._wp) &
& - 2._wp* SIN( rad*zlan ) * TAN( rpi/4._wp- rad*zphh/2._wp)
!
zlam = plamf(ji,jj ) ! j-direction: f-point segment direction (around u-point)
zphi = pphif(ji,jj )
zlan = plamf(ji,jj-1)
zphh = pphif(ji,jj-1)
zxffu = 2._wp* COS( rad*zlam ) * TAN( rpi/4._wp- rad*zphi/2._wp) &
& - 2._wp* COS( rad*zlan ) * TAN( rpi/4._wp- rad*zphh/2._wp)
zyffu = 2._wp* SIN( rad*zlam ) * TAN( rpi/4._wp- rad*zphi/2._wp) &
& - 2._wp* SIN( rad*zlan ) * TAN( rpi/4._wp- rad*zphh/2._wp)
!
zlam = plamf(ji ,jj) ! i-direction: f-point segment direction (around v-point)
zphi = pphif(ji ,jj)
zlan = plamf(ji-1,jj)
zphh = pphif(ji-1,jj)
zxffv = 2._wp* COS( rad*zlam ) * TAN( rpi/4._wp- rad*zphi/2._wp) &
& - 2._wp* COS( rad*zlan ) * TAN( rpi/4._wp- rad*zphh/2._wp)
zyffv = 2._wp* SIN( rad*zlam ) * TAN( rpi/4._wp- rad*zphi/2._wp) &
& - 2._wp* SIN( rad*zlan ) * TAN( rpi/4._wp- rad*zphh/2._wp)
!
zlam = plamu(ji,jj+1) ! j-direction: u-point segment direction (around f-point)
zphi = pphiu(ji,jj+1)
zlan = plamu(ji,jj )
zphh = pphiu(ji,jj )
zxuuf = 2._wp* COS( rad*zlam ) * TAN( rpi/4._wp- rad*zphi/2._wp) &
& - 2._wp* COS( rad*zlan ) * TAN( rpi/4._wp- rad*zphh/2._wp)
zyuuf = 2._wp* SIN( rad*zlam ) * TAN( rpi/4._wp- rad*zphi/2._wp) &
& - 2._wp* SIN( rad*zlan ) * TAN( rpi/4._wp- rad*zphh/2._wp)
!
! ! cosinus and sinus using dot and cross products
gsint(ji,jj) = ( zxnpt*zyvvt - zynpt*zxvvt ) / znvvt
gcost(ji,jj) = ( zxnpt*zxvvt + zynpt*zyvvt ) / znvvt
!
gsinu(ji,jj) = ( zxnpu*zyffu - zynpu*zxffu ) / znffu
gcosu(ji,jj) = ( zxnpu*zxffu + zynpu*zyffu ) / znffu
!
gsinf(ji,jj) = ( zxnpf*zyuuf - zynpf*zxuuf ) / znuuf
gcosf(ji,jj) = ( zxnpf*zxuuf + zynpf*zyuuf ) / znuuf
!
gsinv(ji,jj) = ( zxnpv*zxffv + zynpv*zyffv ) / znffv
gcosv(ji,jj) =-( zxnpv*zyffv - zynpv*zxffv ) / znffv ! (caution, rotation of 90 degres)
!
END_2D
! =============== !
! Geographic mesh !
! =============== !
DO_2D( 0, 1, 0, 0 )
IF( MOD( ABS( plamv(ji,jj) - plamv(ji,jj-1) ), 360._wp) < 1.e-8_wp ) THEN
gsint(ji,jj) = 0._wp
gcost(ji,jj) = 1._wp
IF( MOD( ABS( plamf(ji,jj) - plamf(ji,jj-1) ), 360._wp) < 1.e-8_wp ) THEN
gsinu(ji,jj) = 0._wp
gcosu(ji,jj) = 1._wp
IF( ABS( pphif(ji,jj) - pphif(ji-1,jj) ) < 1.e-8_wp ) THEN
gsinv(ji,jj) = 0._wp
IF( MOD( ABS( plamu(ji,jj) - plamu(ji,jj+1) ), 360._wp) < 1.e-8_wp ) THEN
gsinf(ji,jj) = 0._wp
gcosf(ji,jj) = 1._wp
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
ENDIF
END_2D
! =========================== !
! Lateral boundary conditions !
! =========================== !
! ! lateral boundary cond.: T-, U-, V-, F-pts, sgn
CALL lbc_lnk( 'geo2ocean', gcost, 'T', -1.0_wp, gsint, 'T', -1.0_wp, gcosu, 'U', -1.0_wp, gsinu, 'U', -1.0_wp, &
& gcosv, 'V', -1.0_wp, gsinv, 'V', -1.0_wp, gcosf, 'F', -1.0_wp, gsinf, 'F', -1.0_wp )
!
END SUBROUTINE angle
SUBROUTINE geo2oce ( pxx, pyy, pzz, cgrid, pte, ptn )
!!----------------------------------------------------------------------
!! *** ROUTINE geo2oce ***
!!
!! ** Purpose :
!!
!! ** Method : Change a vector from geocentric to east/north
!!
!!----------------------------------------------------------------------
REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pxx, pyy, pzz
CHARACTER(len=1) , INTENT(in ) :: cgrid
REAL(wp), DIMENSION(jpi,jpj), INTENT( out) :: pte, ptn
!
REAL(wp), PARAMETER :: rpi = 3.141592653e0
REAL(wp), PARAMETER :: rad = rpi / 180.e0
INTEGER :: ig !
INTEGER :: ierr ! local integer
!!----------------------------------------------------------------------
!
IF( .NOT. ALLOCATED( gsinlon ) ) THEN
ALLOCATE( gsinlon(jpi,jpj,4) , gcoslon(jpi,jpj,4) , &
& gsinlat(jpi,jpj,4) , gcoslat(jpi,jpj,4) , STAT=ierr )
CALL mpp_sum( 'geo2ocean', ierr )
IF( ierr /= 0 ) CALL ctl_stop('geo2oce: unable to allocate arrays' )
ENDIF
!
SELECT CASE( cgrid)
CASE ( 'T' )
ig = 1
IF( .NOT. linit(ig) ) THEN
gsinlon(:,:,ig) = SIN( rad * glamt(:,:) )
gcoslon(:,:,ig) = COS( rad * glamt(:,:) )
gsinlat(:,:,ig) = SIN( rad * gphit(:,:) )
gcoslat(:,:,ig) = COS( rad * gphit(:,:) )
linit(ig) = .TRUE.
ENDIF
CASE ( 'U' )
ig = 2
IF( .NOT. linit(ig) ) THEN
gsinlon(:,:,ig) = SIN( rad * glamu(:,:) )
gcoslon(:,:,ig) = COS( rad * glamu(:,:) )
gsinlat(:,:,ig) = SIN( rad * gphiu(:,:) )
gcoslat(:,:,ig) = COS( rad * gphiu(:,:) )
linit(ig) = .TRUE.
ENDIF
CASE ( 'V' )
ig = 3
IF( .NOT. linit(ig) ) THEN
gsinlon(:,:,ig) = SIN( rad * glamv(:,:) )
gcoslon(:,:,ig) = COS( rad * glamv(:,:) )
gsinlat(:,:,ig) = SIN( rad * gphiv(:,:) )
gcoslat(:,:,ig) = COS( rad * gphiv(:,:) )
linit(ig) = .TRUE.
ENDIF
CASE ( 'F' )
ig = 4
IF( .NOT. linit(ig) ) THEN
gsinlon(:,:,ig) = SIN( rad * glamf(:,:) )
gcoslon(:,:,ig) = COS( rad * glamf(:,:) )
gsinlat(:,:,ig) = SIN( rad * gphif(:,:) )
gcoslat(:,:,ig) = COS( rad * gphif(:,:) )
linit(ig) = .TRUE.
ENDIF
CASE default
WRITE(ctmp1,*) 'geo2oce : bad grid argument : ', cgrid
CALL ctl_stop( ctmp1 )
END SELECT
!
pte = - gsinlon(:,:,ig) * pxx + gcoslon(:,:,ig) * pyy
ptn = - gcoslon(:,:,ig) * gsinlat(:,:,ig) * pxx &
& - gsinlon(:,:,ig) * gsinlat(:,:,ig) * pyy &
& + gcoslat(:,:,ig) * pzz
!
END SUBROUTINE geo2oce
SUBROUTINE oce2geo ( pte, ptn, cgrid, pxx , pyy , pzz )
!!----------------------------------------------------------------------
!! *** ROUTINE oce2geo ***
!!
!! ** Purpose :
!!
!! ** Method : Change vector from east/north to geocentric
!!
!! History : ! (A. Caubel) oce2geo - Original code
!!----------------------------------------------------------------------
REAL(wp), DIMENSION(jpi,jpj), INTENT( IN ) :: pte, ptn
CHARACTER(len=1) , INTENT( IN ) :: cgrid
REAL(wp), DIMENSION(jpi,jpj), INTENT( OUT ) :: pxx , pyy , pzz
!!
REAL(wp), PARAMETER :: rpi = 3.141592653e0_wp
REAL(wp), PARAMETER :: rad = rpi / 180.e0_wp
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
INTEGER :: ig !
INTEGER :: ierr ! local integer
!!----------------------------------------------------------------------
IF( .NOT. ALLOCATED( gsinlon ) ) THEN
ALLOCATE( gsinlon(jpi,jpj,4) , gcoslon(jpi,jpj,4) , &
& gsinlat(jpi,jpj,4) , gcoslat(jpi,jpj,4) , STAT=ierr )
CALL mpp_sum( 'geo2ocean', ierr )
IF( ierr /= 0 ) CALL ctl_stop('oce2geo: unable to allocate arrays' )
ENDIF
SELECT CASE( cgrid)
CASE ( 'T' )
ig = 1
IF( .NOT. linit(ig) ) THEN
gsinlon(:,:,ig) = SIN( rad * glamt(:,:) )
gcoslon(:,:,ig) = COS( rad * glamt(:,:) )
gsinlat(:,:,ig) = SIN( rad * gphit(:,:) )
gcoslat(:,:,ig) = COS( rad * gphit(:,:) )
linit(ig) = .TRUE.
ENDIF
CASE ( 'U' )
ig = 2
IF( .NOT. linit(ig) ) THEN
gsinlon(:,:,ig) = SIN( rad * glamu(:,:) )
gcoslon(:,:,ig) = COS( rad * glamu(:,:) )
gsinlat(:,:,ig) = SIN( rad * gphiu(:,:) )
gcoslat(:,:,ig) = COS( rad * gphiu(:,:) )
linit(ig) = .TRUE.
ENDIF
CASE ( 'V' )
ig = 3
IF( .NOT. linit(ig) ) THEN
gsinlon(:,:,ig) = SIN( rad * glamv(:,:) )
gcoslon(:,:,ig) = COS( rad * glamv(:,:) )
gsinlat(:,:,ig) = SIN( rad * gphiv(:,:) )
gcoslat(:,:,ig) = COS( rad * gphiv(:,:) )
linit(ig) = .TRUE.
ENDIF
CASE ( 'F' )
ig = 4
IF( .NOT. linit(ig) ) THEN
gsinlon(:,:,ig) = SIN( rad * glamf(:,:) )
gcoslon(:,:,ig) = COS( rad * glamf(:,:) )
gsinlat(:,:,ig) = SIN( rad * gphif(:,:) )
gcoslat(:,:,ig) = COS( rad * gphif(:,:) )
linit(ig) = .TRUE.
ENDIF
CASE default
WRITE(ctmp1,*) 'geo2oce : bad grid argument : ', cgrid
CALL ctl_stop( ctmp1 )
END SELECT
!
pxx = - gsinlon(:,:,ig) * pte - gcoslon(:,:,ig) * gsinlat(:,:,ig) * ptn
pyy = gcoslon(:,:,ig) * pte - gsinlon(:,:,ig) * gsinlat(:,:,ig) * ptn
pzz = gcoslat(:,:,ig) * ptn
!
END SUBROUTINE oce2geo
SUBROUTINE obs_rot( psinu, pcosu, psinv, pcosv )
!!----------------------------------------------------------------------
!! *** ROUTINE obs_rot ***
!!
!! ** Purpose : Copy gsinu, gcosu, gsinv and gsinv
!! to input data for rotations of
!! current at observation points
!!
!! History : 9.2 ! 09-02 (K. Mogensen)
!!----------------------------------------------------------------------
REAL(wp), DIMENSION(jpi,jpj), INTENT( OUT ):: psinu, pcosu, psinv, pcosv ! copy of data
!!----------------------------------------------------------------------
!
! Initialization of gsin* and gcos* at first call
! -----------------------------------------------
IF( lmust_init ) THEN
IF(lwp) WRITE(numout,*)
IF(lwp) WRITE(numout,*) ' obs_rot : geographic <--> stretched'
IF(lwp) WRITE(numout,*) ' ~~~~~~~ coordinate transformation'
CALL angle( glamt, gphit, glamu, gphiu, glamv, gphiv, glamf, gphif ) ! initialization of the transformation
lmust_init = .FALSE.
ENDIF
!
psinu(:,:) = gsinu(:,:)
pcosu(:,:) = gcosu(:,:)
psinv(:,:) = gsinv(:,:)
pcosv(:,:) = gcosv(:,:)
!
END SUBROUTINE obs_rot
!!======================================================================
END MODULE geo2ocean