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limdyn_2.F90 in trunk/NEMOGCM/NEMO/LIM_SRC_2 – NEMO

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source: trunk/NEMOGCM/NEMO/LIM_SRC_2/limdyn_2.F90 @ 3432

Last change on this file since 3432 was 3294, checked in by rblod, 12 years ago
Merge of 3.4beta into the trunk
Property svn:keywords set to `Id`
File size: 14.0 KB

Rev	Line
[821]	1	MODULE limdyn_2
[3]	2	!!======================================================================
[821]	3	!! * MODULE limdyn_2 *
[3]	4	!! Sea-Ice dynamics :
	5	!!======================================================================
[2528]	6	!! History : 1.0 ! 2001-04 (LIM) Original code
	7	!! 2.0 ! 2002-08 (C. Ethe, G. Madec) F90, mpp
	8	!! 2.0 ! 2003-08 (C. Ethe) add lim_dyn_init
	9	!! 2.0 ! 2006-07 (G. Madec) Surface module
	10	!! 3.3 ! 2009-05 (G. Garric, C. Bricaud) addition of the lim2_evp case
[888]	11	!!---------------------------------------------------------------------
[821]	12	#if defined key_lim2
[3]	13	!!----------------------------------------------------------------------
[821]	14	!! 'key_lim2' : LIM 2.0 sea-ice model
[3]	15	!!----------------------------------------------------------------------
[821]	16	!! lim_dyn_2 : computes ice velocities
	17	!! lim_dyn_init_2 : initialization and namelist read
[3]	18	!!----------------------------------------------------------------------
[2528]	19	USE dom_oce ! ocean space and time domain
	20	USE sbc_oce ! ocean surface boundary condition
	21	USE phycst ! physical constant
	22	USE ice_2 ! LIM-2: ice variables
	23	USE sbc_ice ! Surface boundary condition: sea-ice fields
	24	USE dom_ice_2 ! LIM-2: ice domain
	25	USE limistate_2 ! LIM-2: initial state
	26	USE limrhg_2 ! LIM-2: VP ice rheology
	27	USE limrhg ! LIM : EVP ice rheology
	28	USE lbclnk ! lateral boundary condition - MPP link
	29	USE lib_mpp ! MPP library
[3294]	30	USE wrk_nemo ! work arrays
[2528]	31	USE in_out_manager ! I/O manager
	32	USE prtctl ! Print control
[3]	33
	34	IMPLICIT NONE
	35	PRIVATE
	36
[2528]	37	PUBLIC lim_dyn_2 ! routine called by sbc_ice_lim
[3]	38
[2528]	39	!! * Substitutions
[888]	40	# include "vectopt_loop_substitute.h90"
[3]	41	!!----------------------------------------------------------------------
[2528]	42	!! NEMO/LIM2 3.3 , UCL - NEMO Consortium (2010)
[1156]	43	!! $Id$
[2528]	44	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
[3]	45	!!----------------------------------------------------------------------
	46	CONTAINS
	47
[821]	48	SUBROUTINE lim_dyn_2( kt )
[3]	49	!!-------------------------------------------------------------------
[821]	50	!! * ROUTINE lim_dyn_2 *
[3]	51	!!
[888]	52	!! ** Purpose : compute ice velocity and ocean-ice friction velocity
[3]	53	!!
	54	!! ** Method :
	55	!!
	56	!! ** Action : - Initialisation
	57	!! - Call of the dynamic routine for each hemisphere
[888]	58	!! - computation of the friction velocity at the sea-ice base
[3]	59	!! - treatment of the case if no ice dynamic
	60	!!---------------------------------------------------------------------
[508]	61	INTEGER, INTENT(in) :: kt ! number of iteration
[888]	62	!!
	63	INTEGER :: ji, jj ! dummy loop indices
	64	INTEGER :: i_j1, i_jpj ! Starting/ending j-indices for rheology
	65	REAL(wp) :: zcoef ! temporary scalar
[3294]	66	REAL(wp), POINTER, DIMENSION(: ) :: zind ! i-averaged indicator of sea-ice
	67	REAL(wp), POINTER, DIMENSION(: ) :: zmsk ! i-averaged of tmask
	68	REAL(wp), POINTER, DIMENSION(:,:) :: zu_io, zv_io ! ice-ocean velocity
[3]	69	!!---------------------------------------------------------------------
	70
[3294]	71	CALL wrk_alloc( jpi, jpj, zu_io, zv_io )
	72	CALL wrk_alloc( jpj, zind , zmsk )
[2715]	73
[888]	74	IF( kt == nit000 ) CALL lim_dyn_init_2 ! Initialization (first time-step only)
[3]	75
[888]	76	IF( ln_limdyn ) THEN
	77	!
[3]	78	! Mean ice and snow thicknesses.
	79	hsnm(:,:) = ( 1.0 - frld(:,:) ) * hsnif(:,:)
	80	hicm(:,:) = ( 1.0 - frld(:,:) ) * hicif(:,:)
[888]	81	!
	82	! ! Rheology (ice dynamics)
	83	! ! ========
[76]	84
	85	! Define the j-limits where ice rheology is computed
	86	! ---------------------------------------------------
	87
[2528]	88	IF( lk_mpp .OR. lk_mpp_rep ) THEN ! mpp: compute over the whole domain
[76]	89	i_j1 = 1
	90	i_jpj = jpj
[888]	91	IF(ln_ctl) CALL prt_ctl_info( 'lim_dyn : i_j1 = ', ivar1=i_j1, clinfo2=' ij_jpj = ', ivar2=i_jpj )
[2528]	92	IF( lk_lim2_vp ) THEN ; CALL lim_rhg_2( i_j1, i_jpj ) ! VP rheology
	93	ELSE ; CALL lim_rhg ( i_j1, i_jpj ) ! EVP rheology
	94	ENDIF
[888]	95	!
[76]	96	ELSE ! optimization of the computational area
[888]	97	!
[76]	98	DO jj = 1, jpj
[2715]	99	zind(jj) = SUM( frld (:,jj ) ) ! = REAL(jpj) if ocean everywhere on a j-line
	100	zmsk(jj) = SUM( tmask(:,jj,1) ) ! = 0 if land everywhere on a j-line
[76]	101	END DO
[888]	102	!
[76]	103	IF( l_jeq ) THEN ! local domain include both hemisphere
	104	! ! Rheology is computed in each hemisphere
	105	! ! only over the ice cover latitude strip
	106	! Northern hemisphere
	107	i_j1 = njeq
	108	i_jpj = jpj
	109	DO WHILE ( i_j1 <= jpj .AND. zind(i_j1) == FLOAT(jpi) .AND. zmsk(i_j1) /=0 )
	110	i_j1 = i_j1 + 1
	111	END DO
[2528]	112	IF( lk_lim2_vp ) THEN ! VP rheology
	113	i_j1 = MAX( 1, i_j1-1 )
	114	CALL lim_rhg_2( i_j1, i_jpj )
	115	ELSE ! EVP rheology
	116	i_j1 = MAX( 1, i_j1-2 )
	117	CALL lim_rhg( i_j1, i_jpj )
	118	ENDIF
	119	IF(ln_ctl) WRITE(numout,*) 'lim_dyn : NH i_j1 = ', i_j1, 'ij_jpj = ', i_jpj
	120	!
[76]	121	! Southern hemisphere
	122	i_j1 = 1
	123	i_jpj = njeq
	124	DO WHILE ( i_jpj >= 1 .AND. zind(i_jpj) == FLOAT(jpi) .AND. zmsk(i_jpj) /=0 )
	125	i_jpj = i_jpj - 1
	126	END DO
[2528]	127	IF( lk_lim2_vp ) THEN ! VP rheology
	128	i_jpj = MIN( jpj, i_jpj+2 )
	129	CALL lim_rhg_2( i_j1, i_jpj )
	130	ELSE ! EVP rheology
	131	i_jpj = MIN( jpj, i_jpj+1 )
	132	CALL lim_rhg( i_j1, i_jpj )
	133	ENDIF
	134	IF(ln_ctl) WRITE(numout,*) 'lim_dyn : SH i_j1 = ', i_j1, 'ij_jpj = ', i_jpj
	135	!
[76]	136	ELSE ! local domain extends over one hemisphere only
	137	! ! Rheology is computed only over the ice cover
	138	! ! latitude strip
	139	i_j1 = 1
	140	DO WHILE ( i_j1 <= jpj .AND. zind(i_j1) == FLOAT(jpi) .AND. zmsk(i_j1) /=0 )
	141	i_j1 = i_j1 + 1
	142	END DO
	143	i_j1 = MAX( 1, i_j1-1 )
	144
	145	i_jpj = jpj
	146	DO WHILE ( i_jpj >= 1 .AND. zind(i_jpj) == FLOAT(jpi) .AND. zmsk(i_jpj) /=0 )
	147	i_jpj = i_jpj - 1
	148	END DO
[2528]	149	i_jpj = MIN( jpj, i_jpj+2 )
	150	!
	151	IF( lk_lim2_vp ) THEN ! VP rheology
	152	i_jpj = MIN( jpj, i_jpj+2 )
	153	CALL lim_rhg_2( i_j1, i_jpj ) ! VP rheology
	154	ELSE ! EVP rheology
	155	i_j1 = MAX( 1 , i_j1-2 )
	156	i_jpj = MIN( jpj, i_jpj+1 )
	157	CALL lim_rhg ( i_j1, i_jpj ) ! EVP rheology
	158	ENDIF
[258]	159	IF(ln_ctl) WRITE(numout,*) 'lim_dyn : one hemisphere: i_j1 = ', i_j1, ' ij_jpj = ', i_jpj
[888]	160	!
[76]	161	ENDIF
[888]	162	!
[76]	163	ENDIF
	164
[1470]	165	IF(ln_ctl) CALL prt_ctl(tab2d_1=u_ice , clinfo1=' lim_dyn : u_ice :', tab2d_2=v_ice , clinfo2=' v_ice :')
[3]	166
[888]	167	! computation of friction velocity
	168	! --------------------------------
[2528]	169	SELECT CASE( cp_ice_msh ) ! ice-ocean relative velocity at u- & v-pts
	170	CASE( 'C' ) ! EVP : C-grid ice dynamics
	171	zu_io(:,:) = u_ice(:,:) - ssu_m(:,:) ! ice-ocean & ice velocity at ocean velocity points
	172	zv_io(:,:) = v_ice(:,:) - ssv_m(:,:)
	173	CASE( 'I' ) ! VP : B-grid ice dynamics (I-point)
	174	DO jj = 1, jpjm1 ! u_ice v_ice at I-point ; ssu_m, ssv_m at U- & V-points
	175	DO ji = 1, jpim1 ! NO vector opt. !
	176	zu_io(ji,jj) = 0.5_wp * ( u_ice(ji+1,jj+1) + u_ice(ji+1,jj ) ) - ssu_m(ji,jj)
	177	zv_io(ji,jj) = 0.5_wp * ( v_ice(ji+1,jj+1) + v_ice(ji ,jj+1) ) - ssv_m(ji,jj)
	178	END DO
[3]	179	END DO
[2528]	180	END SELECT
	181
[888]	182	! frictional velocity at T-point
[2528]	183	zcoef = 0.5_wp * cw
[3]	184	DO jj = 2, jpjm1
[1694]	185	DO ji = 2, jpim1 ! NO vector opt. because of zu_io
[2528]	186	ust2s(ji,jj) = zcoef * ( zu_io(ji,jj) * zu_io(ji,jj) + zu_io(ji-1,jj) * zu_io(ji-1,jj) &
	187	& + zv_io(ji,jj) * zv_io(ji,jj) + zv_io(ji,jj-1) * zv_io(ji,jj-1) ) * tms(ji,jj)
[3]	188	END DO
	189	END DO
[888]	190	!
	191	ELSE ! no ice dynamics : transmit directly the atmospheric stress to the ocean
	192	!
	193	zcoef = SQRT( 0.5 ) / rau0
	194	DO jj = 2, jpjm1
	195	DO ji = fs_2, fs_jpim1 ! vector opt.
[2528]	196	ust2s(ji,jj) = zcoef * SQRT( utau(ji,jj) * utau(ji,jj) + utau(ji-1,jj) * utau(ji-1,jj) &
	197	& + vtau(ji,jj) * vtau(ji,jj) + vtau(ji,jj-1) * vtau(ji,jj-1) ) * tms(ji,jj)
[3]	198	END DO
	199	END DO
[888]	200	!
[3]	201	ENDIF
[888]	202	!
[3]	203	CALL lbc_lnk( ust2s, 'T', 1. ) ! T-point
[888]	204	!
	205	IF(ln_ctl) CALL prt_ctl(tab2d_1=ust2s , clinfo1=' lim_dyn : ust2s :')
[2528]	206	!
[3294]	207	CALL wrk_dealloc( jpi, jpj, zu_io, zv_io )
	208	CALL wrk_dealloc( jpj, zind , zmsk )
[2715]	209	!
[821]	210	END SUBROUTINE lim_dyn_2
[3]	211
[76]	212
[821]	213	SUBROUTINE lim_dyn_init_2
[3]	214	!!-------------------------------------------------------------------
[821]	215	!! * ROUTINE lim_dyn_init_2 *
[3]	216	!!
[888]	217	!! ** Purpose : Physical constants and parameters linked to the ice
	218	!! dynamics
[3]	219	!!
[888]	220	!! ** Method : Read the namicedyn namelist and check the ice-dynamic
	221	!! parameter values
[3]	222	!!
	223	!! ** input : Namelist namicedyn
	224	!!-------------------------------------------------------------------
[12]	225	NAMELIST/namicedyn/ epsd, alpha, &
[3]	226	& dm, nbiter, nbitdr, om, resl, cw, angvg, pstar, &
[2528]	227	& c_rhg, etamn, creepl, ecc, ahi0, &
	228	& nevp, telast,alphaevp
[3]	229	!!-------------------------------------------------------------------
	230
[888]	231	REWIND ( numnam_ice ) ! Read Namelist namicedyn
	232	READ ( numnam_ice , namicedyn )
[719]	233
[888]	234	IF(lwp) THEN ! Control print
[3]	235	WRITE(numout,*)
[821]	236	WRITE(numout,*) 'lim_dyn_init_2: ice parameters for ice dynamics '
	237	WRITE(numout,*) '~~~~~~~~~~~~~~'
[76]	238	WRITE(numout,*) ' tolerance parameter epsd = ', epsd
	239	WRITE(numout,*) ' coefficient for semi-implicit coriolis alpha = ', alpha
	240	WRITE(numout,*) ' diffusion constant for dynamics dm = ', dm
	241	WRITE(numout,*) ' number of sub-time steps for relaxation nbiter = ', nbiter
	242	WRITE(numout,*) ' maximum number of iterations for relaxation nbitdr = ', nbitdr
	243	WRITE(numout,*) ' relaxation constant om = ', om
	244	WRITE(numout,*) ' maximum value for the residual of relaxation resl = ', resl
	245	WRITE(numout,*) ' drag coefficient for oceanic stress cw = ', cw
[888]	246	WRITE(numout,*) ' turning angle for oceanic stress angvg = ', angvg, ' degrees'
[76]	247	WRITE(numout,*) ' first bulk-rheology parameter pstar = ', pstar
	248	WRITE(numout,*) ' second bulk-rhelogy parameter c_rhg = ', c_rhg
	249	WRITE(numout,*) ' minimun value for viscosity etamn = ', etamn
	250	WRITE(numout,*) ' creep limit creepl = ', creepl
	251	WRITE(numout,*) ' eccentricity of the elliptical yield curve ecc = ', ecc
	252	WRITE(numout,*) ' horizontal diffusivity coeff. for sea-ice ahi0 = ', ahi0
[2528]	253	WRITE(numout,*) ' number of iterations for subcycling nevp = ', nevp
	254	WRITE(numout,*) ' timescale for elastic waves telast = ', telast
	255	WRITE(numout,*) ' coefficient for the solution of int. stresses alphaevp = ', alphaevp
[3]	256	ENDIF
[2528]	257	!
	258	IF( angvg /= 0._wp .AND. .NOT.lk_lim2_vp ) THEN
	259	CALL ctl_warn( 'lim_dyn_init_2: turning angle for oceanic stress not properly coded for EVP ', &
	260	& '(see limsbc_2 module). We force angvg = 0._wp' )
	261	angvg = 0._wp
	262	ENDIF
[3]	263
[719]	264	! Initialization
[3]	265	usecc2 = 1.0 / ( ecc * ecc )
	266	rhoco = rau0 * cw
[888]	267	angvg = angvg * rad ! convert angvg from degree to radian
[3]	268	sangvg = SIN( angvg )
	269	cangvg = COS( angvg )
	270	pstarh = pstar / 2.0
[888]	271	!
	272	ahiu(:,:) = ahi0 * umask(:,:,1) ! Ice eddy Diffusivity coefficients.
[3]	273	ahiv(:,:) = ahi0 * vmask(:,:,1)
[888]	274	!
[821]	275	END SUBROUTINE lim_dyn_init_2
[3]	276
	277	#else
	278	!!----------------------------------------------------------------------
[821]	279	!! Default option Empty module NO LIM 2.0 sea-ice model
[3]	280	!!----------------------------------------------------------------------
	281	CONTAINS
[821]	282	SUBROUTINE lim_dyn_2 ! Empty routine
	283	END SUBROUTINE lim_dyn_2
[3]	284	#endif
	285
	286	!!======================================================================
[821]	287	END MODULE limdyn_2

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