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sbcice_lim.F90 in branches/2015/dev_r5044_CNRS_LIM3CLEAN/NEMOGCM/NEMO/OPA_SRC/SBC – NEMO

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source: branches/2015/dev_r5044_CNRS_LIM3CLEAN/NEMOGCM/NEMO/OPA_SRC/SBC/sbcice_lim.F90 @ 5078

Last change on this file since 5078 was 5078, checked in by clem, 9 years ago
LIM3: cosmetic changes to increase readability and performance
Property svn:keywords set to `Id`
File size: 31.0 KB

Line
1	MODULE sbcice_lim
2	!!======================================================================
3	!! * MODULE sbcice_lim *
4	!! Surface module : update the ocean surface boundary condition over ice
5	!! & covered area using LIM sea-ice model
6	!! Sea-Ice model : LIM-3 Sea ice model time-stepping
7	!!=====================================================================
8	!! History : 2.0 ! 2006-12 (M. Vancoppenolle) Original code
9	!! 3.0 ! 2008-02 (C. Talandier) Surface module from icestp.F90
10	!! - ! 2008-04 (G. Madec) sltyle and lim_ctl routine
11	!! 3.3 ! 2010-11 (G. Madec) ice-ocean stress always computed at each ocean time-step
12	!! 3.4 ! 2011-01 (A Porter) dynamical allocation
13	!! - ! 2012-10 (C. Rousset) add lim_diahsb
14	!! 3.6 ! 2014-07 (M. Vancoppenolle, G. Madec, O. Marti) revise coupled interface
15	!!----------------------------------------------------------------------
16	#if defined key_lim3
17	!!----------------------------------------------------------------------
18	!! 'key_lim3' : LIM 3.0 sea-ice model
19	!!----------------------------------------------------------------------
20	!! sbc_ice_lim : sea-ice model time-stepping and update ocean sbc over ice-covered area
21	!!----------------------------------------------------------------------
22	USE oce ! ocean dynamics and tracers
23	USE dom_oce ! ocean space and time domain
24	USE ice ! LIM-3: ice variables
25	USE thd_ice ! LIM-3: thermodynamical variables
26	USE dom_ice ! LIM-3: ice domain
27
28	USE sbc_oce ! Surface boundary condition: ocean fields
29	USE sbc_ice ! Surface boundary condition: ice fields
30	USE sbcblk_core ! Surface boundary condition: CORE bulk
31	USE sbcblk_clio ! Surface boundary condition: CLIO bulk
32	USE sbccpl ! Surface boundary condition: coupled interface
33	USE albedo ! ocean & ice albedo
34
35	USE phycst ! Define parameters for the routines
36	USE eosbn2 ! equation of state
37	USE limdyn ! Ice dynamics
38	USE limtrp ! Ice transport
39	USE limthd ! Ice thermodynamics
40	USE limitd_me ! Mechanics on ice thickness distribution
41	USE limsbc ! sea surface boundary condition
42	USE limdiahsb ! Ice budget diagnostics
43	USE limwri ! Ice outputs
44	USE limrst ! Ice restarts
45	USE limupdate1 ! update of global variables
46	USE limupdate2 ! update of global variables
47	USE limvar ! Ice variables switch
48
49	USE limmsh ! LIM mesh
50	USE limistate ! LIM initial state
51	USE limthd_sal ! LIM ice thermodynamics: salinity
52
53	USE c1d ! 1D vertical configuration
54	USE lbclnk ! lateral boundary condition - MPP link
55	USE lib_mpp ! MPP library
56	USE wrk_nemo ! work arrays
57	USE timing ! Timing
58	USE iom ! I/O manager library
59	USE in_out_manager ! I/O manager
60	USE prtctl ! Print control
61	USE lib_fortran !
62	USE limctl
63
64	#if defined key_bdy
65	USE bdyice_lim ! unstructured open boundary data (bdy_ice_lim routine)
66	#endif
67
68	IMPLICIT NONE
69	PRIVATE
70
71	PUBLIC sbc_ice_lim ! routine called by sbcmod.F90
72	PUBLIC sbc_lim_init ! routine called by sbcmod.F90
73
74	!! * Substitutions
75	# include "domzgr_substitute.h90"
76	# include "vectopt_loop_substitute.h90"
77	!!----------------------------------------------------------------------
78	!! NEMO/OPA 4.0 , UCL NEMO Consortium (2011)
79	!! $Id$
80	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
81	!!----------------------------------------------------------------------
82	CONTAINS
83
84	!!======================================================================
85
86	SUBROUTINE sbc_ice_lim( kt, kblk )
87	!!---------------------------------------------------------------------
88	!! * ROUTINE sbc_ice_lim *
89	!!
90	!! ** Purpose : update the ocean surface boundary condition via the
91	!! Louvain la Neuve Sea Ice Model time stepping
92	!!
93	!! ** Method : ice model time stepping
94	!! - call the ice dynamics routine
95	!! - call the ice advection/diffusion routine
96	!! - call the ice thermodynamics routine
97	!! - call the routine that computes mass and
98	!! heat fluxes at the ice/ocean interface
99	!! - save the outputs
100	!! - save the outputs for restart when necessary
101	!!
102	!! ** Action : - time evolution of the LIM sea-ice model
103	!! - update all sbc variables below sea-ice:
104	!! utau, vtau, taum, wndm, qns , qsr, emp , sfx
105	!!---------------------------------------------------------------------
106	INTEGER, INTENT(in) :: kt ! ocean time step
107	INTEGER, INTENT(in) :: kblk ! type of bulk (=3 CLIO, =4 CORE, =5 COUPLED)
108	!!
109	INTEGER :: jl ! dummy loop index
110	REAL(wp), POINTER, DIMENSION(:,:,:) :: zalb_os, zalb_cs ! ice albedo under overcast/clear sky
111	REAL(wp), POINTER, DIMENSION(:,:,:) :: zalb_ice ! mean ice albedo (for coupled)
112	!!----------------------------------------------------------------------
113
114	IF( nn_timing == 1 ) CALL timing_start('sbc_ice_lim')
115
116	IF( MOD( kt-1, nn_fsbc ) == 0 ) THEN ! Ice time-step only
117	!-----------------------!
118	! --- Bulk Formulae --- !
119	!-----------------------!
120	u_oce(:,:) = ssu_m(:,:) * umask(:,:,1) ! mean surface ocean current at ice velocity point
121	v_oce(:,:) = ssv_m(:,:) * vmask(:,:,1) ! (C-grid dynamics : U- & V-points as the ocean)
122
123	! masked sea surface freezing temperature [Kelvin] (set to rt0 over land)
124	t_bo(:,:) = ( eos_fzp( sss_m ) + rt0 ) * tmask(:,:,1) + rt0 * ( 1._wp - tmask(:,:,1) )
125	!
126	! Ice albedo
127	CALL wrk_alloc( jpi,jpj,jpl, zalb_os, zalb_cs, zalb_ice )
128	CALL albedo_ice( t_su, ht_i, ht_s, zalb_cs, zalb_os ) ! cloud-sky and overcast-sky ice albedos
129
130	! CORE and COUPLED bulk formulations
131	SELECT CASE( kblk )
132	CASE( jp_core , jp_cpl )
133
134	! albedo depends on cloud fraction because of non-linear spectral effects
135	zalb_ice(:,:,:) = ( 1. - cldf_ice ) * zalb_cs(:,:,:) + cldf_ice * zalb_os(:,:,:)
136	! In CLIO the cloud fraction is read in the climatology and the all-sky albedo
137	! (zalb_ice) is computed within the bulk routine
138
139	END SELECT
140
141	! Mask sea ice surface temperature (set to rt0 over land)
142	DO jl = 1, jpl
143	t_su(:,:,jl) = t_su(:,:,jl) * tmask(:,:,1) + rt0 * ( 1._wp - tmask(:,:,1) )
144	END DO
145
146	! Bulk formulae - provides the following fields:
147	! utau_ice, vtau_ice : surface ice stress (U- & V-points) [N/m2]
148	! qsr_ice , qns_ice : solar & non solar heat flux over ice (T-point) [W/m2]
149	! qla_ice : latent heat flux over ice (T-point) [W/m2]
150	! dqns_ice, dqla_ice : non solar & latent heat sensistivity (T-point) [W/m2]
151	! tprecip , sprecip : total & solid precipitation (T-point) [Kg/m2/s]
152	! fr1_i0 , fr2_i0 : 1sr & 2nd fraction of qsr penetration in ice [%]
153	!
154	SELECT CASE( kblk )
155	CASE( jp_clio ) ! CLIO bulk formulation
156	CALL blk_ice_clio( t_su , zalb_cs , zalb_os , zalb_ice , &
157	& utau_ice , vtau_ice , qns_ice , qsr_ice , &
158	& qla_ice , dqns_ice , dqla_ice , &
159	& tprecip , sprecip , &
160	& fr1_i0 , fr2_i0 , cp_ice_msh, jpl )
161	!
162	IF( nn_limflx /= 2 ) CALL ice_lim_flx( t_su, zalb_ice, qns_ice, qsr_ice , &
163	& dqns_ice, qla_ice, dqla_ice, nn_limflx )
164
165	CASE( jp_core ) ! CORE bulk formulation
166	CALL blk_ice_core( t_su , u_ice , v_ice , zalb_ice , &
167	& utau_ice , vtau_ice , qns_ice , qsr_ice , &
168	& qla_ice , dqns_ice , dqla_ice , &
169	& tprecip , sprecip , &
170	& fr1_i0 , fr2_i0 , cp_ice_msh, jpl )
171	!
172	IF( nn_limflx /= 2 ) CALL ice_lim_flx( t_su, zalb_ice, qns_ice, qsr_ice , &
173	& dqns_ice, qla_ice, dqla_ice, nn_limflx )
174	!
175	CASE ( jp_cpl )
176
177	CALL sbc_cpl_ice_tau( utau_ice , vtau_ice )
178
179	END SELECT
180
181	!------------------------------!
182	! --- LIM-3 main time-step --- !
183	!------------------------------!
184	numit = numit + nn_fsbc ! Ice model time step
185	!
186	CALL sbc_lim_update ! Store previous ice values
187
188	CALL sbc_lim_diag0 ! set diag of mass, heat and salt fluxes to 0
189
190	CALL lim_rst_opn( kt ) ! Open Ice restart file
191	!
192	! ----------------------------------------------
193	! ice dynamics and transport (except in 1D case)
194	! ----------------------------------------------
195	IF( .NOT. lk_c1d ) THEN
196
197	CALL lim_dyn( kt ) ! Ice dynamics ( rheology/dynamics )
198
199	CALL lim_trp( kt ) ! Ice transport ( Advection/diffusion )
200
201	IF( nn_monocat /= 2 ) CALL lim_itd_me ! Mechanical redistribution ! (ridging/rafting)
202
203	#if defined key_bdy
204	CALL lim_var_glo2eqv
205	CALL bdy_ice_lim( kt ) ! bdy ice thermo
206	CALL lim_var_zapsmall
207	CALL lim_var_agg(1)
208	IF( ln_nicep ) CALL lim_prt( kt, jiindx, jjindx, 1, ' - ice thermo bdy - ' )
209	#endif
210	CALL lim_update1( kt )
211
212	ENDIF
213
214	CALL sbc_lim_update ! Store previous ice values
215
216	! ----------------------------------------------
217	! ice thermodynamics
218	! ----------------------------------------------
219	CALL lim_var_glo2eqv
220	CALL lim_var_agg(1)
221
222	! previous lead fraction and ice volume for flux calculations
223	pfrld(:,:) = 1._wp - at_i(:,:)
224	phicif(:,:) = vt_i(:,:)
225
226	SELECT CASE( kblk )
227	CASE ( jp_cpl )
228	CALL sbc_cpl_ice_flx( p_frld=pfrld, palbi=zalb_ice, psst=sst_m, pist=t_su )
229	IF( nn_limflx == 2 ) CALL ice_lim_flx( t_su, zalb_ice, qns_ice, qsr_ice , &
230	& dqns_ice, qla_ice, dqla_ice, nn_limflx )
231	! Latent heat flux is forced to 0 in coupled: it is included in qns (non-solar heat flux)
232	qla_ice (:,:,:) = 0._wp
233	dqla_ice (:,:,:) = 0._wp
234	END SELECT
235	!
236	CALL lim_thd( kt ) ! Ice thermodynamics
237
238	CALL lim_update2( kt ) ! Corrections
239	!
240	CALL lim_sbc_flx( kt ) ! Update surface ocean mass, heat and salt fluxes
241	!
242	IF(ln_limdiaout) CALL lim_diahsb ! Diagnostics and outputs
243
244	CALL lim_wri( 1 ) ! Ice outputs
245
246	IF( kt == nit000 .AND. ln_rstart ) &
247	& CALL iom_close( numrir ) ! close input ice restart file
248	!
249	IF( lrst_ice ) CALL lim_rst_write( kt ) ! Ice restart file
250	CALL lim_var_glo2eqv ! ???
251	!
252	IF( ln_nicep ) CALL lim_ctl( kt ) ! alerts in case of model crash
253	!
254	CALL wrk_dealloc( jpi,jpj,jpl, zalb_os, zalb_cs, zalb_ice )
255	!
256	ENDIF ! End sea-ice time step only
257
258	!--------------------------------!
259	! --- at all ocean time step --- !
260	!--------------------------------!
261	! Update surface ocean stresses (only in ice-dynamic case)
262	! otherwise the atm.-ocean stresses are used everywhere
263	IF( ln_limdyn ) CALL lim_sbc_tau( kt, ub(:,:,1), vb(:,:,1) ) ! using before instantaneous surf. currents
264	!!gm remark, the ocean-ice stress is not saved in ice diag call above ..... find a solution!!!
265	!
266	IF( nn_timing == 1 ) CALL timing_stop('sbc_ice_lim')
267	!
268	END SUBROUTINE sbc_ice_lim
269
270
271	SUBROUTINE sbc_lim_init
272	!!----------------------------------------------------------------------
273	!! * ROUTINE sbc_lim_init *
274	!!
275	!! ** purpose : Allocate all the dynamic arrays of the LIM-3 modules
276	!!----------------------------------------------------------------------
277	INTEGER :: ierr
278	!!----------------------------------------------------------------------
279	IF(lwp) WRITE(numout,*)
280	IF(lwp) WRITE(numout,*) 'sbc_ice_lim : update ocean surface boudary condition'
281	IF(lwp) WRITE(numout,*) '~~~~~~~~~~~ via Louvain la Neuve Ice Model (LIM-3) time stepping'
282	!
283	! Open the reference and configuration namelist files and namelist output file
284	CALL ctl_opn( numnam_ice_ref, 'namelist_ice_ref', 'OLD', 'FORMATTED', 'SEQUENTIAL', -1, numout, lwp )
285	CALL ctl_opn( numnam_ice_cfg, 'namelist_ice_cfg', 'OLD', 'FORMATTED', 'SEQUENTIAL', -1, numout, lwp )
286	IF(lwm) CALL ctl_opn( numoni, 'output.namelist.ice', 'UNKNOWN', 'FORMATTED', 'SEQUENTIAL', -1, numout, lwp, 1 )
287
288	CALL ice_run ! set some ice run parameters
289	!
290	! ! Allocate the ice arrays
291	ierr = ice_alloc () ! ice variables
292	ierr = ierr + dom_ice_alloc () ! domain
293	ierr = ierr + sbc_ice_alloc () ! surface forcing
294	ierr = ierr + thd_ice_alloc () ! thermodynamics
295	ierr = ierr + lim_itd_me_alloc () ! ice thickness distribution - mechanics
296	!
297	IF( lk_mpp ) CALL mpp_sum( ierr )
298	IF( ierr /= 0 ) CALL ctl_stop('STOP', 'sbc_lim_init : unable to allocate ice arrays')
299	!
300	! ! adequation jpk versus ice/snow layers/categories
301	IF( jpl > jpk .OR. (nlay_i+1) > jpk .OR. nlay_s > jpk ) &
302	& CALL ctl_stop( 'STOP', &
303	& 'sbc_lim_init: the 3rd dimension of workspace arrays is too small.', &
304	& 'use more ocean levels or less ice/snow layers/categories.' )
305	!
306	CALL lim_itd_init ! ice thickness distribution initialization
307	!
308	CALL lim_thd_init ! set ice thermodynics parameters
309	!
310	CALL lim_thd_sal_init ! set ice salinity parameters
311	!
312	CALL lim_msh ! ice mesh initialization
313	!
314	CALL lim_itd_me_init ! ice thickness distribution initialization for mecanical deformation
315	! ! Initial sea-ice state
316	IF( .NOT. ln_rstart ) THEN ! start from rest: sea-ice deduced from sst
317	numit = 0
318	numit = nit000 - 1
319	CALL lim_istate
320	ELSE ! start from a restart file
321	CALL lim_rst_read
322	numit = nit000 - 1
323	ENDIF
324	CALL lim_var_agg(1)
325	CALL lim_var_glo2eqv
326	!
327	CALL lim_sbc_init ! ice surface boundary condition
328	!
329	fr_i(:,:) = at_i(:,:) ! initialisation of sea-ice fraction
330	tn_ice(:,:,:) = t_su(:,:,:) ! initialisation of surface temp for coupled simu
331	!
332	nstart = numit + nn_fsbc
333	nitrun = nitend - nit000 + 1
334	nlast = numit + nitrun
335	!
336	IF( nstock == 0 ) nstock = nlast + 1
337	!
338	END SUBROUTINE sbc_lim_init
339
340
341	SUBROUTINE ice_run
342	!!-------------------------------------------------------------------
343	!! * ROUTINE ice_run *
344	!!
345	!! ** Purpose : Definition some run parameter for ice model
346	!!
347	!! ** Method : Read the namicerun namelist and check the parameter
348	!! values called at the first timestep (nit000)
349	!!
350	!! ** input : Namelist namicerun
351	!!-------------------------------------------------------------------
352	INTEGER :: ios ! Local integer output status for namelist read
353	NAMELIST/namicerun/ jpl, nlay_i, nlay_s, cn_icerst_in, cn_icerst_out, &
354	& ln_limdyn, rn_amax, ln_nicep, ln_limdiahsb, ln_limdiaout
355	!!-------------------------------------------------------------------
356	!
357	REWIND( numnam_ice_ref ) ! Namelist namicerun in reference namelist : Parameters for ice
358	READ ( numnam_ice_ref, namicerun, IOSTAT = ios, ERR = 901)
359	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namicerun in reference namelist', lwp )
360
361	REWIND( numnam_ice_cfg ) ! Namelist namicerun in configuration namelist : Parameters for ice
362	READ ( numnam_ice_cfg, namicerun, IOSTAT = ios, ERR = 902 )
363	902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namicerun in configuration namelist', lwp )
364	IF(lwm) WRITE ( numoni, namicerun )
365	!
366	!
367	IF(lwp) THEN ! control print
368	WRITE(numout,*)
369	WRITE(numout,*) 'ice_run : ice share parameters for dynamics/advection/thermo of sea-ice'
370	WRITE(numout,*) ' ~~~~~~'
371	WRITE(numout,*) ' number of ice categories = ', jpl
372	WRITE(numout,*) ' number of ice layers = ', nlay_i
373	WRITE(numout,*) ' number of snow layers = ', nlay_s
374	WRITE(numout,*) ' switch for ice dynamics (1) or not (0) ln_limdyn = ', ln_limdyn
375	WRITE(numout,*) ' maximum ice concentration = ', rn_amax
376	WRITE(numout,*) ' Several ice points in the ice or not in ocean.output = ', ln_nicep
377	WRITE(numout,*) ' Diagnose heat/salt budget or not ln_limdiahsb = ', ln_limdiahsb
378	WRITE(numout,*) ' Output heat/salt budget or not ln_limdiaout = ', ln_limdiaout
379	ENDIF
380	!
381	!IF( lk_mpp .AND. ln_nicep ) THEN
382	! ln_nicep = .FALSE.
383	! CALL ctl_warn( 'ice_run : specific control print for LIM3 desactivated with MPI' )
384	!ENDIF
385	IF( ln_nicep ) THEN ! control print at a given point
386	jiindx = 15 ; jjindx = 44
387	IF(lwp) WRITE(numout,*) ' The debugging point is : jiindx : ',jiindx, ' jjindx : ',jjindx
388	ENDIF
389	!
390	! sea-ice timestep and inverse
391	rdt_ice = nn_fsbc * rdttra(1)
392	r1_rdtice = 1._wp / rdt_ice
393
394	! inverse of nlay_i and nlay_s
395	r1_nlay_i = 1._wp / REAL( nlay_i, wp )
396	r1_nlay_s = 1._wp / REAL( nlay_s, wp )
397	!
398	END SUBROUTINE ice_run
399
400
401	SUBROUTINE lim_itd_init
402	!!------------------------------------------------------------------
403	!! * ROUTINE lim_itd_init *
404	!!
405	!! ** Purpose : Initializes the ice thickness distribution
406	!! ** Method : ...
407	!! ** input : Namelist namiceitd
408	!!-------------------------------------------------------------------
409	INTEGER :: ios ! Local integer output status for namelist read
410	NAMELIST/namiceitd/ nn_catbnd, rn_himean
411	!
412	INTEGER :: jl ! dummy loop index
413	REAL(wp) :: zc1, zc2, zc3, zx1 ! local scalars
414	REAL(wp) :: zhmax, znum, zden, zalpha !
415	!!------------------------------------------------------------------
416	!
417	REWIND( numnam_ice_ref ) ! Namelist namiceitd in reference namelist : Parameters for ice
418	READ ( numnam_ice_ref, namiceitd, IOSTAT = ios, ERR = 903)
419	903 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namiceitd in reference namelist', lwp )
420
421	REWIND( numnam_ice_cfg ) ! Namelist namiceitd in configuration namelist : Parameters for ice
422	READ ( numnam_ice_cfg, namiceitd, IOSTAT = ios, ERR = 904 )
423	904 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namiceitd in configuration namelist', lwp )
424	IF(lwm) WRITE ( numoni, namiceitd )
425	!
426	!
427	IF(lwp) THEN ! control print
428	WRITE(numout,*)
429	WRITE(numout,*) 'ice_itd : ice cat distribution'
430	WRITE(numout,*) ' ~~~~~~'
431	WRITE(numout,*) ' shape of ice categories distribution nn_catbnd = ', nn_catbnd
432	WRITE(numout,*) ' mean ice thickness in the domain (only active if nn_catbnd=2) rn_himean = ', rn_himean
433	ENDIF
434
435	!----------------------------------
436	!- Thickness categories boundaries
437	!----------------------------------
438	IF(lwp) WRITE(numout,*)
439	IF(lwp) WRITE(numout,*) 'lim_itd_init : Initialization of ice cat distribution '
440	IF(lwp) WRITE(numout,*) '~~~~~~~~~~~~'
441
442	hi_max(:) = 0._wp
443
444	SELECT CASE ( nn_catbnd )
445	!----------------------
446	CASE (1) ! tanh function (CICE)
447	!----------------------
448	zc1 = 3._wp / REAL( jpl, wp )
449	zc2 = 10._wp * zc1
450	zc3 = 3._wp
451
452	DO jl = 1, jpl
453	zx1 = REAL( jl-1, wp ) / REAL( jpl, wp )
454	hi_max(jl) = hi_max(jl-1) + zc1 + zc2 * (1._wp + TANH( zc3 * (zx1 - 1._wp ) ) )
455	END DO
456
457	!----------------------
458	CASE (2) ! h^(-alpha) function
459	!----------------------
460	zalpha = 0.05 ! exponent of the transform function
461
462	zhmax = 3.*rn_himean
463
464	DO jl = 1, jpl
465	znum = jpl * ( zhmax+1 )**zalpha
466	zden = ( jpl - jl ) * ( zhmax+1 )**zalpha + jl
467	hi_max(jl) = ( znum / zden )**(1./zalpha) - 1
468	END DO
469
470	END SELECT
471
472	DO jl = 1, jpl
473	hi_mean(jl) = ( hi_max(jl) + hi_max(jl-1) ) * 0.5_wp
474	END DO
475
476	! Set hi_max(jpl) to a big value to ensure that all ice is thinner than hi_max(jpl)
477	hi_max(jpl) = 99._wp
478
479	IF(lwp) WRITE(numout,*) ' Thickness category boundaries '
480	IF(lwp) WRITE(numout,*) ' hi_max ', hi_max(0:jpl)
481	!
482	END SUBROUTINE lim_itd_init
483
484
485	SUBROUTINE ice_lim_flx( ptn_ice, palb_ice, pqns_ice, pqsr_ice, &
486	& pdqn_ice, pqla_ice, pdql_ice, k_limflx )
487	!!---------------------------------------------------------------------
488	!! * ROUTINE ice_lim_flx *
489	!!
490	!! ** Purpose : update the ice surface boundary condition by averaging and / or
491	!! redistributing fluxes on ice categories
492	!!
493	!! ** Method : average then redistribute
494	!!
495	!! ** Action :
496	!!---------------------------------------------------------------------
497	INTEGER , INTENT(in ) :: k_limflx ! =-1 do nothing; =0 average ;
498	! =1 average and redistribute ; =2 redistribute
499	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: ptn_ice ! ice surface temperature
500	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: palb_ice ! ice albedo
501	REAL(wp), DIMENSION(:,:,:), INTENT(inout) :: pqns_ice ! non solar flux
502	REAL(wp), DIMENSION(:,:,:), INTENT(inout) :: pqsr_ice ! net solar flux
503	REAL(wp), DIMENSION(:,:,:), INTENT(inout) :: pdqn_ice ! non solar flux sensitivity
504	REAL(wp), DIMENSION(:,:,:), INTENT(inout) :: pqla_ice ! latent heat flux
505	REAL(wp), DIMENSION(:,:,:), INTENT(inout) :: pdql_ice ! latent heat flux sensitivity
506	!
507	INTEGER :: jl ! dummy loop index
508	!
509	REAL(wp), POINTER, DIMENSION(:,:) :: zalb_m ! Mean albedo over all categories
510	REAL(wp), POINTER, DIMENSION(:,:) :: ztem_m ! Mean temperature over all categories
511	!
512	REAL(wp), POINTER, DIMENSION(:,:) :: z_qsr_m ! Mean solar heat flux over all categories
513	REAL(wp), POINTER, DIMENSION(:,:) :: z_qns_m ! Mean non solar heat flux over all categories
514	REAL(wp), POINTER, DIMENSION(:,:) :: z_qla_m ! Mean latent heat flux over all categories
515	REAL(wp), POINTER, DIMENSION(:,:) :: z_dqn_m ! Mean d(qns)/dT over all categories
516	REAL(wp), POINTER, DIMENSION(:,:) :: z_dql_m ! Mean d(qla)/dT over all categories
517	!!----------------------------------------------------------------------
518
519	IF( nn_timing == 1 ) CALL timing_start('ice_lim_flx')
520	!
521	!
522	SELECT CASE( k_limflx ) !== averaged on all ice categories ==!
523	CASE( 0 , 1 )
524	CALL wrk_alloc( jpi,jpj, z_qsr_m, z_qns_m, z_qla_m, z_dqn_m, z_dql_m)
525	!
526	z_qns_m(:,:) = fice_ice_ave ( pqns_ice (:,:,:) )
527	z_qsr_m(:,:) = fice_ice_ave ( pqsr_ice (:,:,:) )
528	z_dqn_m(:,:) = fice_ice_ave ( pdqn_ice (:,:,:) )
529	z_qla_m(:,:) = fice_ice_ave ( pqla_ice (:,:,:) )
530	z_dql_m(:,:) = fice_ice_ave ( pdql_ice (:,:,:) )
531	DO jl = 1, jpl
532	pdqn_ice(:,:,jl) = z_dqn_m(:,:)
533	pdql_ice(:,:,jl) = z_dql_m(:,:)
534	END DO
535	!
536	DO jl = 1, jpl
537	pqns_ice(:,:,jl) = z_qns_m(:,:)
538	pqsr_ice(:,:,jl) = z_qsr_m(:,:)
539	pqla_ice(:,:,jl) = z_qla_m(:,:)
540	END DO
541	!
542	CALL wrk_dealloc( jpi,jpj, z_qsr_m, z_qns_m, z_qla_m, z_dqn_m, z_dql_m)
543	END SELECT
544
545	SELECT CASE( k_limflx ) !== redistribution on all ice categories ==!
546	CASE( 1 , 2 )
547	CALL wrk_alloc( jpi,jpj, zalb_m, ztem_m )
548	!
549	zalb_m(:,:) = fice_ice_ave ( palb_ice (:,:,:) )
550	ztem_m(:,:) = fice_ice_ave ( ptn_ice (:,:,:) )
551	DO jl = 1, jpl
552	pqns_ice(:,:,jl) = pqns_ice(:,:,jl) + pdqn_ice(:,:,jl) * (ptn_ice(:,:,jl) - ztem_m(:,:))
553	pqla_ice(:,:,jl) = pqla_ice(:,:,jl) + pdql_ice(:,:,jl) * (ptn_ice(:,:,jl) - ztem_m(:,:))
554	pqsr_ice(:,:,jl) = pqsr_ice(:,:,jl) * ( 1._wp - palb_ice(:,:,jl) ) / ( 1._wp - zalb_m(:,:) )
555	END DO
556	!
557	CALL wrk_dealloc( jpi,jpj, zalb_m, ztem_m )
558	END SELECT
559	!
560	IF( nn_timing == 1 ) CALL timing_stop('ice_lim_flx')
561	!
562	END SUBROUTINE ice_lim_flx
563
564	SUBROUTINE sbc_lim_update
565	!!----------------------------------------------------------------------
566	!! * ROUTINE sbc_lim_update *
567	!!
568	!! ** purpose : store ice variables at "before" time step
569	!!----------------------------------------------------------------------
570	a_i_b (:,:,:) = a_i (:,:,:) ! ice area
571	e_i_b (:,:,:,:) = e_i (:,:,:,:) ! ice thermal energy
572	v_i_b (:,:,:) = v_i (:,:,:) ! ice volume
573	v_s_b (:,:,:) = v_s (:,:,:) ! snow volume
574	e_s_b (:,:,:,:) = e_s (:,:,:,:) ! snow thermal energy
575	smv_i_b(:,:,:) = smv_i(:,:,:) ! salt content
576	oa_i_b (:,:,:) = oa_i (:,:,:) ! areal age content
577	u_ice_b(:,:) = u_ice(:,:)
578	v_ice_b(:,:) = v_ice(:,:)
579
580	END SUBROUTINE sbc_lim_update
581
582	SUBROUTINE sbc_lim_diag0
583	!!----------------------------------------------------------------------
584	!! * ROUTINE sbc_lim_diag0 *
585	!!
586	!! ** purpose : set ice-ocean and ice-atm. fluxes to zeros at the beggining
587	!! of the time step
588	!!----------------------------------------------------------------------
589	sfx (:,:) = 0._wp ;
590	sfx_bri(:,:) = 0._wp ;
591	sfx_sni(:,:) = 0._wp ; sfx_opw(:,:) = 0._wp
592	sfx_bog(:,:) = 0._wp ; sfx_dyn(:,:) = 0._wp
593	sfx_bom(:,:) = 0._wp ; sfx_sum(:,:) = 0._wp
594	sfx_res(:,:) = 0._wp
595
596	wfx_snw(:,:) = 0._wp ; wfx_ice(:,:) = 0._wp
597	wfx_sni(:,:) = 0._wp ; wfx_opw(:,:) = 0._wp
598	wfx_bog(:,:) = 0._wp ; wfx_dyn(:,:) = 0._wp
599	wfx_bom(:,:) = 0._wp ; wfx_sum(:,:) = 0._wp
600	wfx_res(:,:) = 0._wp ; wfx_sub(:,:) = 0._wp
601	wfx_spr(:,:) = 0._wp ;
602
603	hfx_in (:,:) = 0._wp ; hfx_out(:,:) = 0._wp
604	hfx_thd(:,:) = 0._wp ;
605	hfx_snw(:,:) = 0._wp ; hfx_opw(:,:) = 0._wp
606	hfx_bog(:,:) = 0._wp ; hfx_dyn(:,:) = 0._wp
607	hfx_bom(:,:) = 0._wp ; hfx_sum(:,:) = 0._wp
608	hfx_res(:,:) = 0._wp ; hfx_sub(:,:) = 0._wp
609	hfx_spr(:,:) = 0._wp ; hfx_dif(:,:) = 0._wp
610	hfx_err(:,:) = 0._wp ; hfx_err_rem(:,:) = 0._wp
611
612	afx_tot(:,:) = 0._wp ;
613	afx_dyn(:,:) = 0._wp ; afx_thd(:,:) = 0._wp
614
615	diag_heat_dhc(:,:) = 0._wp ;
616
617	END SUBROUTINE sbc_lim_diag0
618
619	FUNCTION fice_cell_ave ( ptab )
620	!!--------------------------------------------------------------------------
621	!! * Compute average over categories, for grid cell (ice covered and free ocean)
622	!!--------------------------------------------------------------------------
623	REAL (wp), DIMENSION (jpi,jpj) :: fice_cell_ave
624	REAL (wp), DIMENSION (jpi,jpj,jpl), INTENT (in) :: ptab
625	INTEGER :: jl ! Dummy loop index
626
627	fice_cell_ave (:,:) = 0.0_wp
628
629	DO jl = 1, jpl
630	fice_cell_ave (:,:) = fice_cell_ave (:,:) + a_i (:,:,jl) * ptab (:,:,jl)
631	END DO
632
633	END FUNCTION fice_cell_ave
634
635
636	FUNCTION fice_ice_ave ( ptab )
637	!!--------------------------------------------------------------------------
638	!! * Compute average over categories, for ice covered part of grid cell
639	!!--------------------------------------------------------------------------
640	REAL (kind=wp), DIMENSION (jpi,jpj) :: fice_ice_ave
641	REAL (kind=wp), DIMENSION (jpi,jpj,jpl), INTENT(in) :: ptab
642
643	fice_ice_ave (:,:) = 0.0_wp
644	WHERE ( at_i (:,:) .GT. 0.0_wp ) fice_ice_ave (:,:) = fice_cell_ave ( ptab (:,:,:)) / at_i (:,:)
645
646	END FUNCTION fice_ice_ave
647
648
649	#else
650	!!----------------------------------------------------------------------
651	!! Default option Dummy module NO LIM 3.0 sea-ice model
652	!!----------------------------------------------------------------------
653	CONTAINS
654	SUBROUTINE sbc_ice_lim ( kt, kblk ) ! Dummy routine
655	WRITE(,) 'sbc_ice_lim: You should not have seen this print! error?', kt, kblk
656	END SUBROUTINE sbc_ice_lim
657	#endif
658
659	!!======================================================================
660	END MODULE sbcice_lim

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