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geo2ocean.F90 in NEMO/trunk/src/OCE/SBC – NEMO

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source: NEMO/trunk/src/OCE/SBC/geo2ocean.F90 @ 10455

Last change on this file since 10455 was 10425, checked in by smasson, 5 years ago
trunk: merge back dev_r10164_HPC09_ESIWACE_PREP_MERGE@10424 into the trunk
Property svn:keywords set to `Id`
File size: 22.3 KB

Rev	Line
[3]	1	MODULE geo2ocean
	2	!!======================================================================
	3	!! * MODULE geo2ocean *
[144]	4	!! Ocean mesh : ???
[1218]	5	!!======================================================================
	6	!! History : OPA ! 07-1996 (O. Marti) Original code
[6140]	7	!! NEMO 1.0 ! 06-2006 (G. Madec ) Free form, F90 + opt.
	8	!! ! 04-2007 (S. Masson) angle: Add T, F points and bugfix in cos lateral boundary
	9	!! 3.0 ! 07-2008 (G. Madec) geo2oce suppress lon/lat agruments
	10	!! 3.7 ! 11-2015 (G. Madec) remove the unused repere and repcmo routines
[1218]	11	!!----------------------------------------------------------------------
[3]	12	!!----------------------------------------------------------------------
[6140]	13	!! rot_rep : Rotate the Repere: geographic grid <==> stretched coordinates grid
	14	!! angle :
	15	!! geo2oce :
	16	!! oce2geo :
[3]	17	!!----------------------------------------------------------------------
[6140]	18	USE dom_oce ! mesh and scale factors
	19	USE phycst ! physical constants
	20	!
	21	USE in_out_manager ! I/O manager
	22	USE lbclnk ! ocean lateral boundary conditions (or mpp link)
	23	USE lib_mpp ! MPP library
[3]	24
	25	IMPLICIT NONE
[1218]	26	PRIVATE
[3]	27
[6140]	28	PUBLIC rot_rep ! called in sbccpl, fldread, and cyclone
	29	PUBLIC geo2oce ! called in sbccpl
	30	PUBLIC oce2geo ! called in sbccpl
	31	PUBLIC obs_rot ! called in obs_rot_vel and obs_write
[3]	32
[6140]	33	! ! cos/sin between model grid lines and NP direction
	34	REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: gsint, gcost ! at T point
	35	REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: gsinu, gcosu ! at U point
	36	REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: gsinv, gcosv ! at V point
	37	REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:) :: gsinf, gcosf ! at F point
[2528]	38
[2715]	39	LOGICAL , SAVE, DIMENSION(4) :: linit = .FALSE.
	40	REAL(wp), ALLOCATABLE, SAVE, DIMENSION(:,:,:) :: gsinlon, gcoslon, gsinlat, gcoslat
	41
[6140]	42	LOGICAL :: lmust_init = .TRUE. !: used to initialize the cos/sin variables (see above)
[672]	43
[1218]	44	!! * Substitutions
[3]	45	# include "vectopt_loop_substitute.h90"
[1218]	46	!!----------------------------------------------------------------------
[9598]	47	!! NEMO/OCE 4.0 , NEMO Consortium (2018)
[1226]	48	!! $Id$
[10068]	49	!! Software governed by the CeCILL license (see ./LICENSE)
[1218]	50	!!----------------------------------------------------------------------
[3]	51	CONTAINS
	52
[685]	53	SUBROUTINE rot_rep ( pxin, pyin, cd_type, cdtodo, prot )
[672]	54	!!----------------------------------------------------------------------
	55	!! * ROUTINE rot_rep *
	56	!!
	57	!! ** Purpose : Rotate the Repere: Change vector componantes between
	58	!! geographic grid <--> stretched coordinates grid.
	59	!!----------------------------------------------------------------------
[6140]	60	REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pxin, pyin ! vector componantes
	61	CHARACTER(len=1), INTENT(in ) :: cd_type ! define the nature of pt2d array grid-points
	62	CHARACTER(len=5), INTENT(in ) :: cdtodo ! type of transpormation:
	63	! ! 'en->i' = east-north to i-component
	64	! ! 'en->j' = east-north to j-component
	65	! ! 'ij->e' = (i,j) components to east
	66	! ! 'ij->n' = (i,j) components to north
	67	REAL(wp), DIMENSION(jpi,jpj), INTENT( out) :: prot
[672]	68	!!----------------------------------------------------------------------
[6140]	69	!
	70	IF( lmust_init ) THEN ! at 1st call only: set gsin. & gcos.
[3]	71	IF(lwp) WRITE(numout,*)
[6140]	72	IF(lwp) WRITE(numout,*) ' rot_rep: coordinate transformation : geographic <==> model (i,j)-components'
	73	IF(lwp) WRITE(numout,*) ' ~~~~~~~~ '
[2715]	74	!
[10370]	75	CALL angle( glamt, gphit, glamu, gphiu, glamv, gphiv, glamf, gphif ) ! initialization of the transformation
[672]	76	lmust_init = .FALSE.
[3]	77	ENDIF
[6140]	78	!
	79	SELECT CASE( cdtodo ) ! type of rotation
	80	!
	81	CASE( 'en->i' ) ! east-north to i-component
[672]	82	SELECT CASE (cd_type)
[7753]	83	CASE ('T') ; prot(:,:) = pxin(:,:) * gcost(:,:) + pyin(:,:) * gsint(:,:)
	84	CASE ('U') ; prot(:,:) = pxin(:,:) * gcosu(:,:) + pyin(:,:) * gsinu(:,:)
	85	CASE ('V') ; prot(:,:) = pxin(:,:) * gcosv(:,:) + pyin(:,:) * gsinv(:,:)
	86	CASE ('F') ; prot(:,:) = pxin(:,:) * gcosf(:,:) + pyin(:,:) * gsinf(:,:)
[672]	87	CASE DEFAULT ; CALL ctl_stop( 'Only T, U, V and F grid points are coded' )
	88	END SELECT
[6140]	89	CASE ('en->j') ! east-north to j-component
[672]	90	SELECT CASE (cd_type)
[7753]	91	CASE ('T') ; prot(:,:) = pyin(:,:) * gcost(:,:) - pxin(:,:) * gsint(:,:)
	92	CASE ('U') ; prot(:,:) = pyin(:,:) * gcosu(:,:) - pxin(:,:) * gsinu(:,:)
	93	CASE ('V') ; prot(:,:) = pyin(:,:) * gcosv(:,:) - pxin(:,:) * gsinv(:,:)
	94	CASE ('F') ; prot(:,:) = pyin(:,:) * gcosf(:,:) - pxin(:,:) * gsinf(:,:)
[672]	95	CASE DEFAULT ; CALL ctl_stop( 'Only T, U, V and F grid points are coded' )
	96	END SELECT
[6140]	97	CASE ('ij->e') ! (i,j)-components to east
[672]	98	SELECT CASE (cd_type)
[7753]	99	CASE ('T') ; prot(:,:) = pxin(:,:) * gcost(:,:) - pyin(:,:) * gsint(:,:)
	100	CASE ('U') ; prot(:,:) = pxin(:,:) * gcosu(:,:) - pyin(:,:) * gsinu(:,:)
	101	CASE ('V') ; prot(:,:) = pxin(:,:) * gcosv(:,:) - pyin(:,:) * gsinv(:,:)
	102	CASE ('F') ; prot(:,:) = pxin(:,:) * gcosf(:,:) - pyin(:,:) * gsinf(:,:)
[672]	103	CASE DEFAULT ; CALL ctl_stop( 'Only T, U, V and F grid points are coded' )
	104	END SELECT
[6140]	105	CASE ('ij->n') ! (i,j)-components to north
[672]	106	SELECT CASE (cd_type)
[7753]	107	CASE ('T') ; prot(:,:) = pyin(:,:) * gcost(:,:) + pxin(:,:) * gsint(:,:)
	108	CASE ('U') ; prot(:,:) = pyin(:,:) * gcosu(:,:) + pxin(:,:) * gsinu(:,:)
	109	CASE ('V') ; prot(:,:) = pyin(:,:) * gcosv(:,:) + pxin(:,:) * gsinv(:,:)
	110	CASE ('F') ; prot(:,:) = pyin(:,:) * gcosf(:,:) + pxin(:,:) * gsinf(:,:)
[672]	111	CASE DEFAULT ; CALL ctl_stop( 'Only T, U, V and F grid points are coded' )
	112	END SELECT
	113	CASE DEFAULT ; CALL ctl_stop( 'rot_rep: Syntax Error in the definition of cdtodo' )
[6140]	114	!
[672]	115	END SELECT
[6140]	116	!
[685]	117	END SUBROUTINE rot_rep
[3]	118
	119
[10370]	120	SUBROUTINE angle( plamt, pphit, plamu, pphiu, plamv, pphiv, plamf, pphif )
[3]	121	!!----------------------------------------------------------------------
	122	!! * ROUTINE angle *
	123	!!
[672]	124	!! ** Purpose : Compute angles between model grid lines and the North direction
[3]	125	!!
[6140]	126	!! ** Method : sinus and cosinus of the angle between the north-south axe
	127	!! and the j-direction at t, u, v and f-points
	128	!! dot and cross products are used to obtain cos and sin, resp.
[3]	129	!!
[6140]	130	!! ** Action : - gsint, gcost, gsinu, gcosu, gsinv, gcosv, gsinf, gcosf
[3]	131	!!----------------------------------------------------------------------
[10370]	132	! WARNING: for an unexplained reason, we need to pass all glam, gphi arrays as input parameters in
	133	! order to get AGRIF working with -03 compilation option
	134	REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: plamt, pphit, plamu, pphiu, plamv, pphiv, plamf, pphif
	135	!
[6140]	136	INTEGER :: ji, jj ! dummy loop indices
	137	INTEGER :: ierr ! local integer
	138	REAL(wp) :: zlam, zphi ! local scalars
	139	REAL(wp) :: zlan, zphh ! - -
	140	REAL(wp) :: zxnpt, zynpt, znnpt ! x,y components and norm of the vector: T point to North Pole
	141	REAL(wp) :: zxnpu, zynpu, znnpu ! x,y components and norm of the vector: U point to North Pole
	142	REAL(wp) :: zxnpv, zynpv, znnpv ! x,y components and norm of the vector: V point to North Pole
	143	REAL(wp) :: zxnpf, zynpf, znnpf ! x,y components and norm of the vector: F point to North Pole
	144	REAL(wp) :: zxvvt, zyvvt, znvvt ! x,y components and norm of the vector: between V points below and above a T point
	145	REAL(wp) :: zxffu, zyffu, znffu ! x,y components and norm of the vector: between F points below and above a U point
	146	REAL(wp) :: zxffv, zyffv, znffv ! x,y components and norm of the vector: between F points left and right a V point
	147	REAL(wp) :: zxuuf, zyuuf, znuuf ! x,y components and norm of the vector: between U points below and above a F point
[3]	148	!!----------------------------------------------------------------------
[6140]	149	!
[2715]	150	ALLOCATE( gsint(jpi,jpj), gcost(jpi,jpj), &
	151	& gsinu(jpi,jpj), gcosu(jpi,jpj), &
	152	& gsinv(jpi,jpj), gcosv(jpi,jpj), &
	153	& gsinf(jpi,jpj), gcosf(jpi,jpj), STAT=ierr )
[10425]	154	CALL mpp_sum( 'geo2ocean', ierr )
[6140]	155	IF( ierr /= 0 ) CALL ctl_stop( 'angle: unable to allocate arrays' )
	156	!
[3]	157	! ============================= !
	158	! Compute the cosinus and sinus !
	159	! ============================= !
	160	! (computation done on the north stereographic polar plane)
[6140]	161	!
[672]	162	DO jj = 2, jpjm1
[3]	163	DO ji = fs_2, jpi ! vector opt.
[6140]	164	!
[10370]	165	zlam = plamt(ji,jj) ! north pole direction & modulous (at t-point)
	166	zphi = pphit(ji,jj)
[672]	167	zxnpt = 0. - 2. * COS( radzlam ) TAN( rpi/4. - rad*zphi/2. )
	168	zynpt = 0. - 2. * SIN( radzlam ) TAN( rpi/4. - rad*zphi/2. )
	169	znnpt = zxnptzxnpt + zynptzynpt
[6140]	170	!
[10370]	171	zlam = plamu(ji,jj) ! north pole direction & modulous (at u-point)
	172	zphi = pphiu(ji,jj)
[3]	173	zxnpu = 0. - 2. * COS( radzlam ) TAN( rpi/4. - rad*zphi/2. )
	174	zynpu = 0. - 2. * SIN( radzlam ) TAN( rpi/4. - rad*zphi/2. )
	175	znnpu = zxnpuzxnpu + zynpuzynpu
[6140]	176	!
[10370]	177	zlam = plamv(ji,jj) ! north pole direction & modulous (at v-point)
	178	zphi = pphiv(ji,jj)
[3]	179	zxnpv = 0. - 2. * COS( radzlam ) TAN( rpi/4. - rad*zphi/2. )
	180	zynpv = 0. - 2. * SIN( radzlam ) TAN( rpi/4. - rad*zphi/2. )
	181	znnpv = zxnpvzxnpv + zynpvzynpv
[6140]	182	!
[10370]	183	zlam = plamf(ji,jj) ! north pole direction & modulous (at f-point)
	184	zphi = pphif(ji,jj)
[672]	185	zxnpf = 0. - 2. * COS( radzlam ) TAN( rpi/4. - rad*zphi/2. )
	186	zynpf = 0. - 2. * SIN( radzlam ) TAN( rpi/4. - rad*zphi/2. )
	187	znnpf = zxnpfzxnpf + zynpfzynpf
[6140]	188	!
[10370]	189	zlam = plamv(ji,jj ) ! j-direction: v-point segment direction (around t-point)
	190	zphi = pphiv(ji,jj )
	191	zlan = plamv(ji,jj-1)
	192	zphh = pphiv(ji,jj-1)
[672]	193	zxvvt = 2. * COS( radzlam ) TAN( rpi/4. - rad*zphi/2. ) &
	194	& - 2. * COS( radzlan ) TAN( rpi/4. - rad*zphh/2. )
	195	zyvvt = 2. * SIN( radzlam ) TAN( rpi/4. - rad*zphi/2. ) &
	196	& - 2. * SIN( radzlan ) TAN( rpi/4. - rad*zphh/2. )
	197	znvvt = SQRT( znnpt * ( zxvvtzxvvt + zyvvtzyvvt ) )
	198	znvvt = MAX( znvvt, 1.e-14 )
[6140]	199	!
[10370]	200	zlam = plamf(ji,jj ) ! j-direction: f-point segment direction (around u-point)
	201	zphi = pphif(ji,jj )
	202	zlan = plamf(ji,jj-1)
	203	zphh = pphif(ji,jj-1)
[3]	204	zxffu = 2. * COS( radzlam ) TAN( rpi/4. - rad*zphi/2. ) &
	205	& - 2. * COS( radzlan ) TAN( rpi/4. - rad*zphh/2. )
	206	zyffu = 2. * SIN( radzlam ) TAN( rpi/4. - rad*zphi/2. ) &
	207	& - 2. * SIN( radzlan ) TAN( rpi/4. - rad*zphh/2. )
[672]	208	znffu = SQRT( znnpu * ( zxffuzxffu + zyffuzyffu ) )
	209	znffu = MAX( znffu, 1.e-14 )
[6140]	210	!
[10370]	211	zlam = plamf(ji ,jj) ! i-direction: f-point segment direction (around v-point)
	212	zphi = pphif(ji ,jj)
	213	zlan = plamf(ji-1,jj)
	214	zphh = pphif(ji-1,jj)
[3]	215	zxffv = 2. * COS( radzlam ) TAN( rpi/4. - rad*zphi/2. ) &
	216	& - 2. * COS( radzlan ) TAN( rpi/4. - rad*zphh/2. )
	217	zyffv = 2. * SIN( radzlam ) TAN( rpi/4. - rad*zphi/2. ) &
	218	& - 2. * SIN( radzlan ) TAN( rpi/4. - rad*zphh/2. )
[672]	219	znffv = SQRT( znnpv * ( zxffvzxffv + zyffvzyffv ) )
	220	znffv = MAX( znffv, 1.e-14 )
[6140]	221	!
[10370]	222	zlam = plamu(ji,jj+1) ! j-direction: u-point segment direction (around f-point)
	223	zphi = pphiu(ji,jj+1)
	224	zlan = plamu(ji,jj )
	225	zphh = pphiu(ji,jj )
[672]	226	zxuuf = 2. * COS( radzlam ) TAN( rpi/4. - rad*zphi/2. ) &
	227	& - 2. * COS( radzlan ) TAN( rpi/4. - rad*zphh/2. )
	228	zyuuf = 2. * SIN( radzlam ) TAN( rpi/4. - rad*zphi/2. ) &
	229	& - 2. * SIN( radzlan ) TAN( rpi/4. - rad*zphh/2. )
	230	znuuf = SQRT( znnpf * ( zxuufzxuuf + zyuufzyuuf ) )
	231	znuuf = MAX( znuuf, 1.e-14 )
[6140]	232	!
	233	! ! cosinus and sinus using dot and cross products
[672]	234	gsint(ji,jj) = ( zxnptzyvvt - zynptzxvvt ) / znvvt
	235	gcost(ji,jj) = ( zxnptzxvvt + zynptzyvvt ) / znvvt
[6140]	236	!
[672]	237	gsinu(ji,jj) = ( zxnpuzyffu - zynpuzxffu ) / znffu
	238	gcosu(ji,jj) = ( zxnpuzxffu + zynpuzyffu ) / znffu
[6140]	239	!
[672]	240	gsinf(ji,jj) = ( zxnpfzyuuf - zynpfzxuuf ) / znuuf
	241	gcosf(ji,jj) = ( zxnpfzxuuf + zynpfzyuuf ) / znuuf
[6140]	242	!
[672]	243	gsinv(ji,jj) = ( zxnpvzxffv + zynpvzyffv ) / znffv
[6140]	244	gcosv(ji,jj) =-( zxnpvzyffv - zynpvzxffv ) / znffv ! (caution, rotation of 90 degres)
	245	!
[3]	246	END DO
	247	END DO
	248
	249	! =============== !
	250	! Geographic mesh !
	251	! =============== !
	252
[672]	253	DO jj = 2, jpjm1
[3]	254	DO ji = fs_2, jpi ! vector opt.
[10370]	255	IF( MOD( ABS( plamv(ji,jj) - plamv(ji,jj-1) ), 360. ) < 1.e-8 ) THEN
[672]	256	gsint(ji,jj) = 0.
	257	gcost(ji,jj) = 1.
	258	ENDIF
[10370]	259	IF( MOD( ABS( plamf(ji,jj) - plamf(ji,jj-1) ), 360. ) < 1.e-8 ) THEN
[3]	260	gsinu(ji,jj) = 0.
	261	gcosu(ji,jj) = 1.
	262	ENDIF
[10370]	263	IF( ABS( pphif(ji,jj) - pphif(ji-1,jj) ) < 1.e-8 ) THEN
[3]	264	gsinv(ji,jj) = 0.
	265	gcosv(ji,jj) = 1.
	266	ENDIF
[10370]	267	IF( MOD( ABS( plamu(ji,jj) - plamu(ji,jj+1) ), 360. ) < 1.e-8 ) THEN
[672]	268	gsinf(ji,jj) = 0.
	269	gcosf(ji,jj) = 1.
	270	ENDIF
[3]	271	END DO
	272	END DO
	273
	274	! =========================== !
	275	! Lateral boundary conditions !
	276	! =========================== !
[6140]	277	! ! lateral boundary cond.: T-, U-, V-, F-pts, sgn
[10425]	278	CALL lbc_lnk_multi( 'geo2ocean', gcost, 'T', -1., gsint, 'T', -1., gcosu, 'U', -1., gsinu, 'U', -1., &
[9098]	279	& gcosv, 'V', -1., gsinv, 'V', -1., gcosf, 'F', -1., gsinf, 'F', -1. )
[6140]	280	!
[3]	281	END SUBROUTINE angle
	282
	283
[6140]	284	SUBROUTINE geo2oce ( pxx, pyy, pzz, cgrid, pte, ptn )
[3]	285	!!----------------------------------------------------------------------
	286	!! * ROUTINE geo2oce *
	287	!!
	288	!! ** Purpose :
	289	!!
[6140]	290	!! ** Method : Change a vector from geocentric to east/north
[3]	291	!!
	292	!!----------------------------------------------------------------------
[1218]	293	REAL(wp), DIMENSION(jpi,jpj), INTENT(in ) :: pxx, pyy, pzz
	294	CHARACTER(len=1) , INTENT(in ) :: cgrid
	295	REAL(wp), DIMENSION(jpi,jpj), INTENT( out) :: pte, ptn
[6140]	296	!
[2715]	297	REAL(wp), PARAMETER :: rpi = 3.141592653e0
[88]	298	REAL(wp), PARAMETER :: rad = rpi / 180.e0
[1218]	299	INTEGER :: ig !
[2715]	300	INTEGER :: ierr ! local integer
[1218]	301	!!----------------------------------------------------------------------
[6140]	302	!
[2715]	303	IF( .NOT. ALLOCATED( gsinlon ) ) THEN
	304	ALLOCATE( gsinlon(jpi,jpj,4) , gcoslon(jpi,jpj,4) , &
	305	& gsinlat(jpi,jpj,4) , gcoslat(jpi,jpj,4) , STAT=ierr )
[10425]	306	CALL mpp_sum( 'geo2ocean', ierr )
[4162]	307	IF( ierr /= 0 ) CALL ctl_stop('geo2oce: unable to allocate arrays' )
[2715]	308	ENDIF
[6140]	309	!
[1218]	310	SELECT CASE( cgrid)
[6140]	311	CASE ( 'T' )
	312	ig = 1
	313	IF( .NOT. linit(ig) ) THEN
	314	gsinlon(:,:,ig) = SIN( rad * glamt(:,:) )
	315	gcoslon(:,:,ig) = COS( rad * glamt(:,:) )
	316	gsinlat(:,:,ig) = SIN( rad * gphit(:,:) )
	317	gcoslat(:,:,ig) = COS( rad * gphit(:,:) )
	318	linit(ig) = .TRUE.
	319	ENDIF
	320	CASE ( 'U' )
	321	ig = 2
	322	IF( .NOT. linit(ig) ) THEN
	323	gsinlon(:,:,ig) = SIN( rad * glamu(:,:) )
	324	gcoslon(:,:,ig) = COS( rad * glamu(:,:) )
	325	gsinlat(:,:,ig) = SIN( rad * gphiu(:,:) )
	326	gcoslat(:,:,ig) = COS( rad * gphiu(:,:) )
	327	linit(ig) = .TRUE.
	328	ENDIF
	329	CASE ( 'V' )
	330	ig = 3
	331	IF( .NOT. linit(ig) ) THEN
	332	gsinlon(:,:,ig) = SIN( rad * glamv(:,:) )
	333	gcoslon(:,:,ig) = COS( rad * glamv(:,:) )
	334	gsinlat(:,:,ig) = SIN( rad * gphiv(:,:) )
	335	gcoslat(:,:,ig) = COS( rad * gphiv(:,:) )
	336	linit(ig) = .TRUE.
	337	ENDIF
	338	CASE ( 'F' )
	339	ig = 4
	340	IF( .NOT. linit(ig) ) THEN
	341	gsinlon(:,:,ig) = SIN( rad * glamf(:,:) )
	342	gcoslon(:,:,ig) = COS( rad * glamf(:,:) )
	343	gsinlat(:,:,ig) = SIN( rad * gphif(:,:) )
	344	gcoslat(:,:,ig) = COS( rad * gphif(:,:) )
	345	linit(ig) = .TRUE.
	346	ENDIF
	347	CASE default
	348	WRITE(ctmp1,*) 'geo2oce : bad grid argument : ', cgrid
	349	CALL ctl_stop( ctmp1 )
[1218]	350	END SELECT
[6140]	351	!
[2715]	352	pte = - gsinlon(:,:,ig) * pxx + gcoslon(:,:,ig) * pyy
	353	ptn = - gcoslon(:,:,ig) * gsinlat(:,:,ig) * pxx &
[6140]	354	& - gsinlon(:,:,ig) * gsinlat(:,:,ig) * pyy &
	355	& + gcoslat(:,:,ig) * pzz
[1218]	356	!
	357	END SUBROUTINE geo2oce
	358
[6140]	359
	360	SUBROUTINE oce2geo ( pte, ptn, cgrid, pxx , pyy , pzz )
[1218]	361	!!----------------------------------------------------------------------
	362	!! * ROUTINE oce2geo *
	363	!!
	364	!! ** Purpose :
	365	!!
	366	!! ** Method : Change vector from east/north to geocentric
	367	!!
[6140]	368	!! History : ! (A. Caubel) oce2geo - Original code
[1218]	369	!!----------------------------------------------------------------------
	370	REAL(wp), DIMENSION(jpi,jpj), INTENT( IN ) :: pte, ptn
	371	CHARACTER(len=1) , INTENT( IN ) :: cgrid
	372	REAL(wp), DIMENSION(jpi,jpj), INTENT( OUT ) :: pxx , pyy , pzz
	373	!!
	374	REAL(wp), PARAMETER :: rpi = 3.141592653E0
	375	REAL(wp), PARAMETER :: rad = rpi / 180.e0
[3]	376	INTEGER :: ig !
[2715]	377	INTEGER :: ierr ! local integer
[3]	378	!!----------------------------------------------------------------------
	379
[4162]	380	IF( .NOT. ALLOCATED( gsinlon ) ) THEN
[2715]	381	ALLOCATE( gsinlon(jpi,jpj,4) , gcoslon(jpi,jpj,4) , &
	382	& gsinlat(jpi,jpj,4) , gcoslat(jpi,jpj,4) , STAT=ierr )
[10425]	383	CALL mpp_sum( 'geo2ocean', ierr )
[4162]	384	IF( ierr /= 0 ) CALL ctl_stop('oce2geo: unable to allocate arrays' )
[2715]	385	ENDIF
	386
[3]	387	SELECT CASE( cgrid)
[1226]	388	CASE ( 'T' )
	389	ig = 1
	390	IF( .NOT. linit(ig) ) THEN
[2715]	391	gsinlon(:,:,ig) = SIN( rad * glamt(:,:) )
	392	gcoslon(:,:,ig) = COS( rad * glamt(:,:) )
	393	gsinlat(:,:,ig) = SIN( rad * gphit(:,:) )
	394	gcoslat(:,:,ig) = COS( rad * gphit(:,:) )
[1226]	395	linit(ig) = .TRUE.
	396	ENDIF
	397	CASE ( 'U' )
	398	ig = 2
	399	IF( .NOT. linit(ig) ) THEN
[2715]	400	gsinlon(:,:,ig) = SIN( rad * glamu(:,:) )
	401	gcoslon(:,:,ig) = COS( rad * glamu(:,:) )
	402	gsinlat(:,:,ig) = SIN( rad * gphiu(:,:) )
	403	gcoslat(:,:,ig) = COS( rad * gphiu(:,:) )
[1226]	404	linit(ig) = .TRUE.
	405	ENDIF
	406	CASE ( 'V' )
	407	ig = 3
	408	IF( .NOT. linit(ig) ) THEN
[2715]	409	gsinlon(:,:,ig) = SIN( rad * glamv(:,:) )
	410	gcoslon(:,:,ig) = COS( rad * glamv(:,:) )
	411	gsinlat(:,:,ig) = SIN( rad * gphiv(:,:) )
	412	gcoslat(:,:,ig) = COS( rad * gphiv(:,:) )
[1226]	413	linit(ig) = .TRUE.
	414	ENDIF
	415	CASE ( 'F' )
	416	ig = 4
	417	IF( .NOT. linit(ig) ) THEN
[2715]	418	gsinlon(:,:,ig) = SIN( rad * glamf(:,:) )
	419	gcoslon(:,:,ig) = COS( rad * glamf(:,:) )
	420	gsinlat(:,:,ig) = SIN( rad * gphif(:,:) )
	421	gcoslat(:,:,ig) = COS( rad * gphif(:,:) )
[1226]	422	linit(ig) = .TRUE.
	423	ENDIF
	424	CASE default
	425	WRITE(ctmp1,*) 'geo2oce : bad grid argument : ', cgrid
[474]	426	CALL ctl_stop( ctmp1 )
[1226]	427	END SELECT
[6140]	428	!
	429	pxx = - gsinlon(:,:,ig) * pte - gcoslon(:,:,ig) * gsinlat(:,:,ig) * ptn
	430	pyy = gcoslon(:,:,ig) * pte - gsinlon(:,:,ig) * gsinlat(:,:,ig) * ptn
	431	pzz = gcoslat(:,:,ig) * ptn
	432	!
[1218]	433	END SUBROUTINE oce2geo
[3]	434
	435
[6140]	436	SUBROUTINE obs_rot( psinu, pcosu, psinv, pcosv )
[3]	437	!!----------------------------------------------------------------------
[2528]	438	!! * ROUTINE obs_rot *
	439	!!
	440	!! ** Purpose : Copy gsinu, gcosu, gsinv and gsinv
	441	!! to input data for rotations of
	442	!! current at observation points
	443	!!
[6140]	444	!! History : 9.2 ! 09-02 (K. Mogensen)
[2528]	445	!!----------------------------------------------------------------------
[2715]	446	REAL(wp), DIMENSION(jpi,jpj), INTENT( OUT ):: psinu, pcosu, psinv, pcosv ! copy of data
[2528]	447	!!----------------------------------------------------------------------
[6140]	448	!
[2528]	449	! Initialization of gsin* and gcos* at first call
	450	! -----------------------------------------------
	451	IF( lmust_init ) THEN
	452	IF(lwp) WRITE(numout,*)
	453	IF(lwp) WRITE(numout,*) ' obs_rot : geographic <--> stretched'
	454	IF(lwp) WRITE(numout,*) ' ~~~~~~~ coordinate transformation'
[10370]	455	CALL angle( glamt, gphit, glamu, gphiu, glamv, gphiv, glamf, gphif ) ! initialization of the transformation
[2528]	456	lmust_init = .FALSE.
	457	ENDIF
[6140]	458	!
[2528]	459	psinu(:,:) = gsinu(:,:)
	460	pcosu(:,:) = gcosu(:,:)
	461	psinv(:,:) = gsinv(:,:)
	462	pcosv(:,:) = gcosv(:,:)
[6140]	463	!
[2528]	464	END SUBROUTINE obs_rot
	465
[3]	466	!!======================================================================
	467	END MODULE geo2ocean

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