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limdyn_2.F90 @ 7910

Last change on this file since 7910 was 7910, checked in by timgraham, 7 years ago
All wrk_alloc removed
Property svn:keywords set to `Id`
File size: 14.4 KB

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[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
	30	USE in_out_manager ! I/O manager
	31	USE prtctl ! Print control
[3625]	32	USE lib_fortran ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined)
[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
[7910]	66	REAL(wp), DIMENSION(jpj) :: zind ! i-averaged indicator of sea-ice
	67	REAL(wp), DIMENSION(jpj) :: zmsk ! i-averaged of tmask
	68	REAL(wp), DIMENSION(jpi,jpj) :: zu_io, zv_io ! ice-ocean velocity
[3]	69	!!---------------------------------------------------------------------
	70
[2715]	71
[888]	72	IF( kt == nit000 ) CALL lim_dyn_init_2 ! Initialization (first time-step only)
[3]	73
[888]	74	IF( ln_limdyn ) THEN
	75	!
[3]	76	! Mean ice and snow thicknesses.
	77	hsnm(:,:) = ( 1.0 - frld(:,:) ) * hsnif(:,:)
	78	hicm(:,:) = ( 1.0 - frld(:,:) ) * hicif(:,:)
[888]	79	!
	80	! ! Rheology (ice dynamics)
	81	! ! ========
[76]	82
	83	! Define the j-limits where ice rheology is computed
	84	! ---------------------------------------------------
	85
[7646]	86	IF( lk_mpp ) THEN ! mpp: compute over the whole domain
[76]	87	i_j1 = 1
	88	i_jpj = jpj
[888]	89	IF(ln_ctl) CALL prt_ctl_info( 'lim_dyn : i_j1 = ', ivar1=i_j1, clinfo2=' ij_jpj = ', ivar2=i_jpj )
[2528]	90	IF( lk_lim2_vp ) THEN ; CALL lim_rhg_2( i_j1, i_jpj ) ! VP rheology
	91	ELSE ; CALL lim_rhg ( i_j1, i_jpj ) ! EVP rheology
	92	ENDIF
[888]	93	!
[76]	94	ELSE ! optimization of the computational area
[888]	95	!
[76]	96	DO jj = 1, jpj
[2715]	97	zind(jj) = SUM( frld (:,jj ) ) ! = REAL(jpj) if ocean everywhere on a j-line
	98	zmsk(jj) = SUM( tmask(:,jj,1) ) ! = 0 if land everywhere on a j-line
[76]	99	END DO
[888]	100	!
[76]	101	IF( l_jeq ) THEN ! local domain include both hemisphere
	102	! ! Rheology is computed in each hemisphere
	103	! ! only over the ice cover latitude strip
	104	! Northern hemisphere
	105	i_j1 = njeq
	106	i_jpj = jpj
	107	DO WHILE ( i_j1 <= jpj .AND. zind(i_j1) == FLOAT(jpi) .AND. zmsk(i_j1) /=0 )
	108	i_j1 = i_j1 + 1
	109	END DO
[2528]	110	IF( lk_lim2_vp ) THEN ! VP rheology
	111	i_j1 = MAX( 1, i_j1-1 )
	112	CALL lim_rhg_2( i_j1, i_jpj )
	113	ELSE ! EVP rheology
	114	i_j1 = MAX( 1, i_j1-2 )
	115	CALL lim_rhg( i_j1, i_jpj )
	116	ENDIF
	117	IF(ln_ctl) WRITE(numout,*) 'lim_dyn : NH i_j1 = ', i_j1, 'ij_jpj = ', i_jpj
	118	!
[76]	119	! Southern hemisphere
	120	i_j1 = 1
	121	i_jpj = njeq
	122	DO WHILE ( i_jpj >= 1 .AND. zind(i_jpj) == FLOAT(jpi) .AND. zmsk(i_jpj) /=0 )
	123	i_jpj = i_jpj - 1
	124	END DO
[2528]	125	IF( lk_lim2_vp ) THEN ! VP rheology
	126	i_jpj = MIN( jpj, i_jpj+2 )
	127	CALL lim_rhg_2( i_j1, i_jpj )
	128	ELSE ! EVP rheology
	129	i_jpj = MIN( jpj, i_jpj+1 )
	130	CALL lim_rhg( i_j1, i_jpj )
	131	ENDIF
	132	IF(ln_ctl) WRITE(numout,*) 'lim_dyn : SH i_j1 = ', i_j1, 'ij_jpj = ', i_jpj
	133	!
[76]	134	ELSE ! local domain extends over one hemisphere only
	135	! ! Rheology is computed only over the ice cover
	136	! ! latitude strip
	137	i_j1 = 1
	138	DO WHILE ( i_j1 <= jpj .AND. zind(i_j1) == FLOAT(jpi) .AND. zmsk(i_j1) /=0 )
	139	i_j1 = i_j1 + 1
	140	END DO
	141	i_j1 = MAX( 1, i_j1-1 )
	142
	143	i_jpj = jpj
	144	DO WHILE ( i_jpj >= 1 .AND. zind(i_jpj) == FLOAT(jpi) .AND. zmsk(i_jpj) /=0 )
	145	i_jpj = i_jpj - 1
	146	END DO
[2528]	147	i_jpj = MIN( jpj, i_jpj+2 )
	148	!
	149	IF( lk_lim2_vp ) THEN ! VP rheology
	150	i_jpj = MIN( jpj, i_jpj+2 )
	151	CALL lim_rhg_2( i_j1, i_jpj ) ! VP rheology
	152	ELSE ! EVP rheology
	153	i_j1 = MAX( 1 , i_j1-2 )
	154	i_jpj = MIN( jpj, i_jpj+1 )
	155	CALL lim_rhg ( i_j1, i_jpj ) ! EVP rheology
	156	ENDIF
[258]	157	IF(ln_ctl) WRITE(numout,*) 'lim_dyn : one hemisphere: i_j1 = ', i_j1, ' ij_jpj = ', i_jpj
[888]	158	!
[76]	159	ENDIF
[888]	160	!
[76]	161	ENDIF
	162
[1470]	163	IF(ln_ctl) CALL prt_ctl(tab2d_1=u_ice , clinfo1=' lim_dyn : u_ice :', tab2d_2=v_ice , clinfo2=' v_ice :')
[3]	164
[888]	165	! computation of friction velocity
	166	! --------------------------------
[2528]	167	SELECT CASE( cp_ice_msh ) ! ice-ocean relative velocity at u- & v-pts
	168	CASE( 'C' ) ! EVP : C-grid ice dynamics
	169	zu_io(:,:) = u_ice(:,:) - ssu_m(:,:) ! ice-ocean & ice velocity at ocean velocity points
	170	zv_io(:,:) = v_ice(:,:) - ssv_m(:,:)
	171	CASE( 'I' ) ! VP : B-grid ice dynamics (I-point)
	172	DO jj = 1, jpjm1 ! u_ice v_ice at I-point ; ssu_m, ssv_m at U- & V-points
	173	DO ji = 1, jpim1 ! NO vector opt. !
	174	zu_io(ji,jj) = 0.5_wp * ( u_ice(ji+1,jj+1) + u_ice(ji+1,jj ) ) - ssu_m(ji,jj)
	175	zv_io(ji,jj) = 0.5_wp * ( v_ice(ji+1,jj+1) + v_ice(ji ,jj+1) ) - ssv_m(ji,jj)
	176	END DO
[3]	177	END DO
[2528]	178	END SELECT
	179
[888]	180	! frictional velocity at T-point
[2528]	181	zcoef = 0.5_wp * cw
[3]	182	DO jj = 2, jpjm1
[1694]	183	DO ji = 2, jpim1 ! NO vector opt. because of zu_io
[2528]	184	ust2s(ji,jj) = zcoef * ( zu_io(ji,jj) * zu_io(ji,jj) + zu_io(ji-1,jj) * zu_io(ji-1,jj) &
	185	& + zv_io(ji,jj) * zv_io(ji,jj) + zv_io(ji,jj-1) * zv_io(ji,jj-1) ) * tms(ji,jj)
[3]	186	END DO
	187	END DO
[888]	188	!
	189	ELSE ! no ice dynamics : transmit directly the atmospheric stress to the ocean
	190	!
	191	zcoef = SQRT( 0.5 ) / rau0
	192	DO jj = 2, jpjm1
	193	DO ji = fs_2, fs_jpim1 ! vector opt.
[2528]	194	ust2s(ji,jj) = zcoef * SQRT( utau(ji,jj) * utau(ji,jj) + utau(ji-1,jj) * utau(ji-1,jj) &
	195	& + vtau(ji,jj) * vtau(ji,jj) + vtau(ji,jj-1) * vtau(ji,jj-1) ) * tms(ji,jj)
[3]	196	END DO
	197	END DO
[888]	198	!
[3]	199	ENDIF
[888]	200	!
[3]	201	CALL lbc_lnk( ust2s, 'T', 1. ) ! T-point
[888]	202	!
	203	IF(ln_ctl) CALL prt_ctl(tab2d_1=ust2s , clinfo1=' lim_dyn : ust2s :')
[2528]	204	!
[2715]	205	!
[821]	206	END SUBROUTINE lim_dyn_2
[3]	207
[76]	208
[821]	209	SUBROUTINE lim_dyn_init_2
[3]	210	!!-------------------------------------------------------------------
[821]	211	!! * ROUTINE lim_dyn_init_2 *
[3]	212	!!
[888]	213	!! ** Purpose : Physical constants and parameters linked to the ice
	214	!! dynamics
[3]	215	!!
[888]	216	!! ** Method : Read the namicedyn namelist and check the ice-dynamic
	217	!! parameter values
[3]	218	!!
	219	!! ** input : Namelist namicedyn
	220	!!-------------------------------------------------------------------
[4147]	221	INTEGER :: ios ! Local integer output status for namelist read
[12]	222	NAMELIST/namicedyn/ epsd, alpha, &
[3]	223	& dm, nbiter, nbitdr, om, resl, cw, angvg, pstar, &
[5123]	224	& c_rhg, etamn, rn_creepl, rn_ecc, ahi0, &
	225	& nn_nevp, telast, alphaevp
[3]	226	!!-------------------------------------------------------------------
[4147]	227
	228	REWIND( numnam_ice_ref ) ! Namelist namicedyn in reference namelist : Ice dynamics
	229	READ ( numnam_ice_ref, namicedyn, IOSTAT = ios, ERR = 901)
	230	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namicedyn in reference namelist', lwp )
[3]	231
[4147]	232	REWIND( numnam_ice_cfg ) ! Namelist namicedyn in configuration namelist : Ice dynamics
	233	READ ( numnam_ice_cfg, namicedyn, IOSTAT = ios, ERR = 902 )
	234	902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namicedyn in configuration namelist', lwp )
[4624]	235	IF(lwm) WRITE ( numoni, namicedyn )
[719]	236
[888]	237	IF(lwp) THEN ! Control print
[3]	238	WRITE(numout,*)
[821]	239	WRITE(numout,*) 'lim_dyn_init_2: ice parameters for ice dynamics '
	240	WRITE(numout,*) '~~~~~~~~~~~~~~'
[76]	241	WRITE(numout,*) ' tolerance parameter epsd = ', epsd
	242	WRITE(numout,*) ' coefficient for semi-implicit coriolis alpha = ', alpha
	243	WRITE(numout,*) ' diffusion constant for dynamics dm = ', dm
	244	WRITE(numout,*) ' number of sub-time steps for relaxation nbiter = ', nbiter
	245	WRITE(numout,*) ' maximum number of iterations for relaxation nbitdr = ', nbitdr
	246	WRITE(numout,*) ' relaxation constant om = ', om
	247	WRITE(numout,*) ' maximum value for the residual of relaxation resl = ', resl
	248	WRITE(numout,*) ' drag coefficient for oceanic stress cw = ', cw
[888]	249	WRITE(numout,*) ' turning angle for oceanic stress angvg = ', angvg, ' degrees'
[76]	250	WRITE(numout,*) ' first bulk-rheology parameter pstar = ', pstar
	251	WRITE(numout,*) ' second bulk-rhelogy parameter c_rhg = ', c_rhg
	252	WRITE(numout,*) ' minimun value for viscosity etamn = ', etamn
[5123]	253	WRITE(numout,*) ' creep limit rn_creepl = ', rn_creepl
	254	WRITE(numout,*) ' eccentricity of the elliptical yield curve rn_ecc = ', rn_ecc
[76]	255	WRITE(numout,*) ' horizontal diffusivity coeff. for sea-ice ahi0 = ', ahi0
[5123]	256	WRITE(numout,*) ' number of iterations for subcycling nn_nevp= ', nn_nevp
[2528]	257	WRITE(numout,*) ' timescale for elastic waves telast = ', telast
	258	WRITE(numout,*) ' coefficient for the solution of int. stresses alphaevp = ', alphaevp
[3]	259	ENDIF
[2528]	260	!
	261	IF( angvg /= 0._wp .AND. .NOT.lk_lim2_vp ) THEN
	262	CALL ctl_warn( 'lim_dyn_init_2: turning angle for oceanic stress not properly coded for EVP ', &
	263	& '(see limsbc_2 module). We force angvg = 0._wp' )
	264	angvg = 0._wp
	265	ENDIF
[3]	266
[719]	267	! Initialization
[5123]	268	usecc2 = 1.0 / ( rn_ecc * rn_ecc )
[3]	269	rhoco = rau0 * cw
[888]	270	angvg = angvg * rad ! convert angvg from degree to radian
[3]	271	sangvg = SIN( angvg )
	272	cangvg = COS( angvg )
	273	pstarh = pstar / 2.0
[888]	274	!
	275	ahiu(:,:) = ahi0 * umask(:,:,1) ! Ice eddy Diffusivity coefficients.
[3]	276	ahiv(:,:) = ahi0 * vmask(:,:,1)
[888]	277	!
[821]	278	END SUBROUTINE lim_dyn_init_2
[3]	279
	280	#else
	281	!!----------------------------------------------------------------------
[821]	282	!! Default option Empty module NO LIM 2.0 sea-ice model
[3]	283	!!----------------------------------------------------------------------
	284	CONTAINS
[821]	285	SUBROUTINE lim_dyn_2 ! Empty routine
	286	END SUBROUTINE lim_dyn_2
[3]	287	#endif
	288
	289	!!======================================================================
[821]	290	END MODULE limdyn_2

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source: branches/2017/dev_r7881_no_wrk_alloc/NEMOGCM/NEMO/LIM_SRC_2/limdyn_2.F90 @ 7910

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