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asminc.F90 @ 6140

Last change on this file since 6140 was 6140, checked in by timgraham, 8 years ago

Merge of branches/2015/dev_merge_2015 back into trunk. Merge excludes NEMOGCM/TOOLS/OBSTOOLS/ for now due to issues with the change of file type. Will sort these manually with further commits.

Branch merged as follows:
In the working copy of branch ran:
svn merge svn+ssh://forge.ipsl.jussieu.fr/ipsl/forge/projets/nemo/svn/trunk@HEAD
Small conflicts due to bug fixes applied to trunk since the dev_merge_2015 was copied. Bug fixes were applied to the branch as well so these were easy to resolve.
Branch committed at this stage

In working copy run:
svn switch svn+ssh://forge.ipsl.jussieu.fr/ipsl/forge/projets/nemo/svn/trunk
to switch working copy

Run:
svn merge --reintegrate svn+ssh://forge.ipsl.jussieu.fr/ipsl/forge/projets/nemo/svn/branches/2015/dev_merge_2015
to merge the branch into the trunk and then commit - no conflicts at this stage.

Property svn:keywords set to Id

File size: 44.8 KB

Line
1	MODULE asminc
2	!!======================================================================
3	!! * MODULE asminc *
4	!! Assimilation increment : Apply an increment generated by data
5	!! assimilation
6	!!======================================================================
7	!! History : ! 2007-03 (M. Martin) Met Office version
8	!! ! 2007-04 (A. Weaver) calc_date original code
9	!! ! 2007-04 (A. Weaver) Merge with OPAVAR/NEMOVAR
10	!! NEMO 3.3 ! 2010-05 (D. Lea) Update to work with NEMO v3.2
11	!! - ! 2010-05 (D. Lea) add calc_month_len routine based on day_init
12	!! 3.4 ! 2012-10 (A. Weaver and K. Mogensen) Fix for direct initialization
13	!! ! 2014-09 (D. Lea) Local calc_date removed use routine from OBS
14	!! ! 2015-11 (D. Lea) Handle non-zero initial time of day
15	!!----------------------------------------------------------------------
16
17	!!----------------------------------------------------------------------
18	!! asm_inc_init : Initialize the increment arrays and IAU weights
19	!! tra_asm_inc : Apply the tracer (T and S) increments
20	!! dyn_asm_inc : Apply the dynamic (u and v) increments
21	!! ssh_asm_inc : Apply the SSH increment
22	!! seaice_asm_inc : Apply the seaice increment
23	!!----------------------------------------------------------------------
24	USE wrk_nemo ! Memory Allocation
25	USE par_oce ! Ocean space and time domain variables
26	USE dom_oce ! Ocean space and time domain
27	USE domvvl ! domain: variable volume level
28	USE oce ! Dynamics and active tracers defined in memory
29	USE ldfdyn ! lateral diffusion: eddy viscosity coefficients
30	USE eosbn2 ! Equation of state - in situ and potential density
31	USE zpshde ! Partial step : Horizontal Derivative
32	USE iom ! Library to read input files
33	USE asmpar ! Parameters for the assmilation interface
34	USE c1d ! 1D initialization
35	USE in_out_manager ! I/O manager
36	USE lib_mpp ! MPP library
37	#if defined key_lim2
38	USE ice_2 ! LIM2
39	#endif
40	USE sbc_oce ! Surface boundary condition variables.
41	USE diaobs, ONLY: calc_date ! Compute the calendar date on a given step
42
43	IMPLICIT NONE
44	PRIVATE
45
46	PUBLIC asm_inc_init !: Initialize the increment arrays and IAU weights
47	PUBLIC tra_asm_inc !: Apply the tracer (T and S) increments
48	PUBLIC dyn_asm_inc !: Apply the dynamic (u and v) increments
49	PUBLIC ssh_asm_inc !: Apply the SSH increment
50	PUBLIC seaice_asm_inc !: Apply the seaice increment
51
52	#if defined key_asminc
53	LOGICAL, PUBLIC, PARAMETER :: lk_asminc = .TRUE. !: Logical switch for assimilation increment interface
54	#else
55	LOGICAL, PUBLIC, PARAMETER :: lk_asminc = .FALSE. !: No assimilation increments
56	#endif
57	LOGICAL, PUBLIC :: ln_bkgwri !: No output of the background state fields
58	LOGICAL, PUBLIC :: ln_asmiau !: No applying forcing with an assimilation increment
59	LOGICAL, PUBLIC :: ln_asmdin !: No direct initialization
60	LOGICAL, PUBLIC :: ln_trainc !: No tracer (T and S) assimilation increments
61	LOGICAL, PUBLIC :: ln_dyninc !: No dynamics (u and v) assimilation increments
62	LOGICAL, PUBLIC :: ln_sshinc !: No sea surface height assimilation increment
63	LOGICAL, PUBLIC :: ln_seaiceinc !: No sea ice concentration increment
64	LOGICAL, PUBLIC :: ln_salfix !: Apply minimum salinity check
65	LOGICAL, PUBLIC :: ln_temnofreeze = .FALSE. !: Don't allow the temperature to drop below freezing
66	INTEGER, PUBLIC :: nn_divdmp !: Apply divergence damping filter nn_divdmp times
67
68	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: t_bkg , s_bkg !: Background temperature and salinity
69	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: u_bkg , v_bkg !: Background u- & v- velocity components
70	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: t_bkginc, s_bkginc !: Increment to the background T & S
71	REAL(wp), PUBLIC, DIMENSION(:,:,:), ALLOCATABLE :: u_bkginc, v_bkginc !: Increment to the u- & v-components
72	REAL(wp), PUBLIC, DIMENSION(:) , ALLOCATABLE :: wgtiau !: IAU weights for each time step
73	#if defined key_asminc
74	REAL(wp), PUBLIC, DIMENSION(:,:), ALLOCATABLE :: ssh_iau !: IAU-weighted sea surface height increment
75	#endif
76	! !!! time steps relative to the cycle interval [0,nitend-nit000-1]
77	INTEGER , PUBLIC :: nitbkg !: Time step of the background state used in the Jb term
78	INTEGER , PUBLIC :: nitdin !: Time step of the background state for direct initialization
79	INTEGER , PUBLIC :: nitiaustr !: Time step of the start of the IAU interval
80	INTEGER , PUBLIC :: nitiaufin !: Time step of the end of the IAU interval
81	!
82	INTEGER , PUBLIC :: niaufn !: Type of IAU weighing function: = 0 Constant weighting
83	! !: = 1 Linear hat-like, centred in middle of IAU interval
84	REAL(wp), PUBLIC :: salfixmin !: Ensure that the salinity is larger than this value if (ln_salfix)
85
86	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: ssh_bkg, ssh_bkginc ! Background sea surface height and its increment
87	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: seaice_bkginc ! Increment to the background sea ice conc
88
89	!! * Substitutions
90	# include "vectopt_loop_substitute.h90"
91	!!----------------------------------------------------------------------
92	!! NEMO/OPA 3.7 , NEMO Consortium (2015)
93	!! $Id$
94	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
95	!!----------------------------------------------------------------------
96	CONTAINS
97
98	SUBROUTINE asm_inc_init
99	!!----------------------------------------------------------------------
100	!! * ROUTINE asm_inc_init *
101	!!
102	!! ** Purpose : Initialize the assimilation increment and IAU weights.
103	!!
104	!! ** Method : Initialize the assimilation increment and IAU weights.
105	!!
106	!! ** Action :
107	!!----------------------------------------------------------------------
108	INTEGER :: ji, jj, jk, jt ! dummy loop indices
109	INTEGER :: imid, inum ! local integers
110	INTEGER :: ios ! Local integer output status for namelist read
111	INTEGER :: iiauper ! Number of time steps in the IAU period
112	INTEGER :: icycper ! Number of time steps in the cycle
113	REAL(KIND=dp) :: ditend_date ! Date YYYYMMDD.HHMMSS of final time step
114	REAL(KIND=dp) :: ditbkg_date ! Date YYYYMMDD.HHMMSS of background time step for Jb term
115	REAL(KIND=dp) :: ditdin_date ! Date YYYYMMDD.HHMMSS of background time step for DI
116	REAL(KIND=dp) :: ditiaustr_date ! Date YYYYMMDD.HHMMSS of IAU interval start time step
117	REAL(KIND=dp) :: ditiaufin_date ! Date YYYYMMDD.HHMMSS of IAU interval final time step
118
119	REAL(wp) :: znorm ! Normalization factor for IAU weights
120	REAL(wp) :: ztotwgt ! Value of time-integrated IAU weights (should be equal to one)
121	REAL(wp) :: z_inc_dateb ! Start date of interval on which increment is valid
122	REAL(wp) :: z_inc_datef ! End date of interval on which increment is valid
123	REAL(wp) :: zdate_bkg ! Date in background state file for DI
124	REAL(wp) :: zdate_inc ! Time axis in increments file
125	!
126	REAL(wp), POINTER, DIMENSION(:,:) :: hdiv ! 2D workspace
127	!!
128	NAMELIST/nam_asminc/ ln_bkgwri, &
129	& ln_trainc, ln_dyninc, ln_sshinc, &
130	& ln_asmdin, ln_asmiau, &
131	& nitbkg, nitdin, nitiaustr, nitiaufin, niaufn, &
132	& ln_salfix, salfixmin, nn_divdmp
133	!!----------------------------------------------------------------------
134
135	!-----------------------------------------------------------------------
136	! Read Namelist nam_asminc : assimilation increment interface
137	!-----------------------------------------------------------------------
138	ln_seaiceinc = .FALSE.
139	ln_temnofreeze = .FALSE.
140
141	REWIND( numnam_ref ) ! Namelist nam_asminc in reference namelist : Assimilation increment
142	READ ( numnam_ref, nam_asminc, IOSTAT = ios, ERR = 901)
143	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nam_asminc in reference namelist', lwp )
144
145	REWIND( numnam_cfg ) ! Namelist nam_asminc in configuration namelist : Assimilation increment
146	READ ( numnam_cfg, nam_asminc, IOSTAT = ios, ERR = 902 )
147	902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'nam_asminc in configuration namelist', lwp )
148	IF(lwm) WRITE ( numond, nam_asminc )
149
150	! Control print
151	IF(lwp) THEN
152	WRITE(numout,*)
153	WRITE(numout,*) 'asm_inc_init : Assimilation increment initialization :'
154	WRITE(numout,*) '~~~~~~~~~~~~'
155	WRITE(numout,*) ' Namelist namasm : set assimilation increment parameters'
156	WRITE(numout,*) ' Logical switch for writing out background state ln_bkgwri = ', ln_bkgwri
157	WRITE(numout,*) ' Logical switch for applying tracer increments ln_trainc = ', ln_trainc
158	WRITE(numout,*) ' Logical switch for applying velocity increments ln_dyninc = ', ln_dyninc
159	WRITE(numout,*) ' Logical switch for applying SSH increments ln_sshinc = ', ln_sshinc
160	WRITE(numout,*) ' Logical switch for Direct Initialization (DI) ln_asmdin = ', ln_asmdin
161	WRITE(numout,*) ' Logical switch for applying sea ice increments ln_seaiceinc = ', ln_seaiceinc
162	WRITE(numout,*) ' Logical switch for Incremental Analysis Updating (IAU) ln_asmiau = ', ln_asmiau
163	WRITE(numout,*) ' Timestep of background in [0,nitend-nit000-1] nitbkg = ', nitbkg
164	WRITE(numout,*) ' Timestep of background for DI in [0,nitend-nit000-1] nitdin = ', nitdin
165	WRITE(numout,*) ' Timestep of start of IAU interval in [0,nitend-nit000-1] nitiaustr = ', nitiaustr
166	WRITE(numout,*) ' Timestep of end of IAU interval in [0,nitend-nit000-1] nitiaufin = ', nitiaufin
167	WRITE(numout,*) ' Type of IAU weighting function niaufn = ', niaufn
168	WRITE(numout,*) ' Logical switch for ensuring that the sa > salfixmin ln_salfix = ', ln_salfix
169	WRITE(numout,*) ' Minimum salinity after applying the increments salfixmin = ', salfixmin
170	ENDIF
171
172	nitbkg_r = nitbkg + nit000 - 1 ! Background time referenced to nit000
173	nitdin_r = nitdin + nit000 - 1 ! Background time for DI referenced to nit000
174	nitiaustr_r = nitiaustr + nit000 - 1 ! Start of IAU interval referenced to nit000
175	nitiaufin_r = nitiaufin + nit000 - 1 ! End of IAU interval referenced to nit000
176
177	iiauper = nitiaufin_r - nitiaustr_r + 1 ! IAU interval length
178	icycper = nitend - nit000 + 1 ! Cycle interval length
179
180	! Date of final time step
181	CALL calc_date( nitend, ditend_date )
182
183	! Background time for Jb referenced to ndate0
184	CALL calc_date( nitbkg_r, ditbkg_date )
185
186	! Background time for DI referenced to ndate0
187	CALL calc_date( nitdin_r, ditdin_date )
188
189	! IAU start time referenced to ndate0
190	CALL calc_date( nitiaustr_r, ditiaustr_date )
191
192	! IAU end time referenced to ndate0
193	CALL calc_date( nitiaufin_r, ditiaufin_date )
194
195	IF(lwp) THEN
196	WRITE(numout,*)
197	WRITE(numout,*) ' Time steps referenced to current cycle:'
198	WRITE(numout,*) ' iitrst = ', nit000 - 1
199	WRITE(numout,*) ' nit000 = ', nit000
200	WRITE(numout,*) ' nitend = ', nitend
201	WRITE(numout,*) ' nitbkg_r = ', nitbkg_r
202	WRITE(numout,*) ' nitdin_r = ', nitdin_r
203	WRITE(numout,*) ' nitiaustr_r = ', nitiaustr_r
204	WRITE(numout,*) ' nitiaufin_r = ', nitiaufin_r
205	WRITE(numout,*)
206	WRITE(numout,*) ' Dates referenced to current cycle:'
207	WRITE(numout,*) ' ndastp = ', ndastp
208	WRITE(numout,*) ' ndate0 = ', ndate0
209	WRITE(numout,*) ' nn_time0 = ', nn_time0
210	WRITE(numout,*) ' ditend_date = ', ditend_date
211	WRITE(numout,*) ' ditbkg_date = ', ditbkg_date
212	WRITE(numout,*) ' ditdin_date = ', ditdin_date
213	WRITE(numout,*) ' ditiaustr_date = ', ditiaustr_date
214	WRITE(numout,*) ' ditiaufin_date = ', ditiaufin_date
215	ENDIF
216
217
218	IF ( ( ln_asmdin ).AND.( ln_asmiau ) ) &
219	& CALL ctl_stop( ' ln_asmdin and ln_asmiau :', &
220	& ' Choose Direct Initialization OR Incremental Analysis Updating')
221
222	IF ( ( ( .NOT. ln_asmdin ).AND.( .NOT. ln_asmiau ) ) &
223	.AND.( ( ln_trainc ).OR.( ln_dyninc ).OR.( ln_sshinc ) .OR. ( ln_seaiceinc) )) &
224	& CALL ctl_stop( ' One or more of ln_trainc, ln_dyninc, ln_sshinc and ln_seaiceinc is set to .true.', &
225	& ' but ln_asmdin and ln_asmiau are both set to .false. :', &
226	& ' Inconsistent options')
227
228	IF ( ( niaufn /= 0 ).AND.( niaufn /= 1 ) ) &
229	& CALL ctl_stop( ' niaufn /= 0 or niaufn /=1 :', &
230	& ' Type IAU weighting function is invalid')
231
232	IF ( ( .NOT. ln_trainc ).AND.( .NOT. ln_dyninc ).AND.( .NOT. ln_sshinc ).AND.( .NOT. ln_seaiceinc ) &
233	& ) &
234	& CALL ctl_warn( ' ln_trainc, ln_dyninc, ln_sshinc and ln_seaiceinc are set to .false. :', &
235	& ' The assimilation increments are not applied')
236
237	IF ( ( ln_asmiau ).AND.( nitiaustr == nitiaufin ) ) &
238	& CALL ctl_stop( ' nitiaustr = nitiaufin :', &
239	& ' IAU interval is of zero length')
240
241	IF ( ( ln_asmiau ).AND.( ( nitiaustr_r < nit000 ).OR.( nitiaufin_r > nitend ) ) ) &
242	& CALL ctl_stop( ' nitiaustr or nitiaufin :', &
243	& ' IAU starting or final time step is outside the cycle interval', &
244	& ' Valid range nit000 to nitend')
245
246	IF ( ( nitbkg_r < nit000 - 1 ).OR.( nitbkg_r > nitend ) ) &
247	& CALL ctl_stop( ' nitbkg :', &
248	& ' Background time step is outside the cycle interval')
249
250	IF ( ( nitdin_r < nit000 - 1 ).OR.( nitdin_r > nitend ) ) &
251	& CALL ctl_stop( ' nitdin :', &
252	& ' Background time step for Direct Initialization is outside', &
253	& ' the cycle interval')
254
255	IF ( nstop > 0 ) RETURN ! if there are any errors then go no further
256
257	!--------------------------------------------------------------------
258	! Initialize the Incremental Analysis Updating weighting function
259	!--------------------------------------------------------------------
260
261	IF ( ln_asmiau ) THEN
262
263	ALLOCATE( wgtiau( icycper ) )
264
265	wgtiau(:) = 0.0
266
267	IF ( niaufn == 0 ) THEN
268
269	!---------------------------------------------------------
270	! Constant IAU forcing
271	!---------------------------------------------------------
272
273	DO jt = 1, iiauper
274	wgtiau(jt+nitiaustr-1) = 1.0 / REAL( iiauper )
275	END DO
276
277	ELSEIF ( niaufn == 1 ) THEN
278
279	!---------------------------------------------------------
280	! Linear hat-like, centred in middle of IAU interval
281	!---------------------------------------------------------
282
283	! Compute the normalization factor
284	znorm = 0.0
285	IF ( MOD( iiauper, 2 ) == 0 ) THEN ! Even number of time steps in IAU interval
286	imid = iiauper / 2
287	DO jt = 1, imid
288	znorm = znorm + REAL( jt )
289	END DO
290	znorm = 2.0 * znorm
291	ELSE ! Odd number of time steps in IAU interval
292	imid = ( iiauper + 1 ) / 2
293	DO jt = 1, imid - 1
294	znorm = znorm + REAL( jt )
295	END DO
296	znorm = 2.0 * znorm + REAL( imid )
297	ENDIF
298	znorm = 1.0 / znorm
299
300	DO jt = 1, imid - 1
301	wgtiau(jt+nitiaustr-1) = REAL( jt ) * znorm
302	END DO
303	DO jt = imid, iiauper
304	wgtiau(jt+nitiaustr-1) = REAL( iiauper - jt + 1 ) * znorm
305	END DO
306
307	ENDIF
308
309	! Test that the integral of the weights over the weighting interval equals 1
310	IF(lwp) THEN
311	WRITE(numout,*)
312	WRITE(numout,*) 'asm_inc_init : IAU weights'
313	WRITE(numout,*) '~~~~~~~~~~~~'
314	WRITE(numout,*) ' time step IAU weight'
315	WRITE(numout,*) ' ========= ====================='
316	ztotwgt = 0.0
317	DO jt = 1, icycper
318	ztotwgt = ztotwgt + wgtiau(jt)
319	WRITE(numout,*) ' ', jt, ' ', wgtiau(jt)
320	END DO
321	WRITE(numout,*) ' ==================================='
322	WRITE(numout,*) ' Time-integrated weight = ', ztotwgt
323	WRITE(numout,*) ' ==================================='
324	ENDIF
325
326	ENDIF
327
328	!--------------------------------------------------------------------
329	! Allocate and initialize the increment arrays
330	!--------------------------------------------------------------------
331
332	ALLOCATE( t_bkginc(jpi,jpj,jpk) )
333	ALLOCATE( s_bkginc(jpi,jpj,jpk) )
334	ALLOCATE( u_bkginc(jpi,jpj,jpk) )
335	ALLOCATE( v_bkginc(jpi,jpj,jpk) )
336	ALLOCATE( ssh_bkginc(jpi,jpj) )
337	ALLOCATE( seaice_bkginc(jpi,jpj))
338	#if defined key_asminc
339	ALLOCATE( ssh_iau(jpi,jpj) )
340	#endif
341	t_bkginc(:,:,:) = 0.0
342	s_bkginc(:,:,:) = 0.0
343	u_bkginc(:,:,:) = 0.0
344	v_bkginc(:,:,:) = 0.0
345	ssh_bkginc(:,:) = 0.0
346	seaice_bkginc(:,:) = 0.0
347	#if defined key_asminc
348	ssh_iau(:,:) = 0.0
349	#endif
350	IF ( ( ln_trainc ).OR.( ln_dyninc ).OR.( ln_sshinc ).OR.( ln_seaiceinc ) ) THEN
351
352	!--------------------------------------------------------------------
353	! Read the increments from file
354	!--------------------------------------------------------------------
355
356	CALL iom_open( c_asminc, inum )
357
358	CALL iom_get( inum, 'time', zdate_inc )
359
360	CALL iom_get( inum, 'z_inc_dateb', z_inc_dateb )
361	CALL iom_get( inum, 'z_inc_datef', z_inc_datef )
362	z_inc_dateb = zdate_inc
363	z_inc_datef = zdate_inc
364
365	IF(lwp) THEN
366	WRITE(numout,*)
367	WRITE(numout,*) 'asm_inc_init : Assimilation increments valid ', &
368	& ' between dates ', z_inc_dateb,' and ', &
369	& z_inc_datef
370	WRITE(numout,*) '~~~~~~~~~~~~'
371	ENDIF
372
373	IF ( ( z_inc_dateb < ndastp + nn_time0*0.0001_wp ) &
374	& .OR.( z_inc_datef > ditend_date ) ) &
375	& CALL ctl_warn( ' Validity time of assimilation increments is ', &
376	& ' outside the assimilation interval' )
377
378	IF ( ( ln_asmdin ).AND.( zdate_inc /= ditdin_date ) ) &
379	& CALL ctl_warn( ' Validity time of assimilation increments does ', &
380	& ' not agree with Direct Initialization time' )
381
382	IF ( ln_trainc ) THEN
383	CALL iom_get( inum, jpdom_autoglo, 'bckint', t_bkginc, 1 )
384	CALL iom_get( inum, jpdom_autoglo, 'bckins', s_bkginc, 1 )
385	! Apply the masks
386	t_bkginc(:,:,:) = t_bkginc(:,:,:) * tmask(:,:,:)
387	s_bkginc(:,:,:) = s_bkginc(:,:,:) * tmask(:,:,:)
388	! Set missing increments to 0.0 rather than 1e+20
389	! to allow for differences in masks
390	WHERE( ABS( t_bkginc(:,:,:) ) > 1.0e+10 ) t_bkginc(:,:,:) = 0.0
391	WHERE( ABS( s_bkginc(:,:,:) ) > 1.0e+10 ) s_bkginc(:,:,:) = 0.0
392	ENDIF
393
394	IF ( ln_dyninc ) THEN
395	CALL iom_get( inum, jpdom_autoglo, 'bckinu', u_bkginc, 1 )
396	CALL iom_get( inum, jpdom_autoglo, 'bckinv', v_bkginc, 1 )
397	! Apply the masks
398	u_bkginc(:,:,:) = u_bkginc(:,:,:) * umask(:,:,:)
399	v_bkginc(:,:,:) = v_bkginc(:,:,:) * vmask(:,:,:)
400	! Set missing increments to 0.0 rather than 1e+20
401	! to allow for differences in masks
402	WHERE( ABS( u_bkginc(:,:,:) ) > 1.0e+10 ) u_bkginc(:,:,:) = 0.0
403	WHERE( ABS( v_bkginc(:,:,:) ) > 1.0e+10 ) v_bkginc(:,:,:) = 0.0
404	ENDIF
405
406	IF ( ln_sshinc ) THEN
407	CALL iom_get( inum, jpdom_autoglo, 'bckineta', ssh_bkginc, 1 )
408	! Apply the masks
409	ssh_bkginc(:,:) = ssh_bkginc(:,:) * tmask(:,:,1)
410	! Set missing increments to 0.0 rather than 1e+20
411	! to allow for differences in masks
412	WHERE( ABS( ssh_bkginc(:,:) ) > 1.0e+10 ) ssh_bkginc(:,:) = 0.0
413	ENDIF
414
415	IF ( ln_seaiceinc ) THEN
416	CALL iom_get( inum, jpdom_autoglo, 'bckinseaice', seaice_bkginc, 1 )
417	! Apply the masks
418	seaice_bkginc(:,:) = seaice_bkginc(:,:) * tmask(:,:,1)
419	! Set missing increments to 0.0 rather than 1e+20
420	! to allow for differences in masks
421	WHERE( ABS( seaice_bkginc(:,:) ) > 1.0e+10 ) seaice_bkginc(:,:) = 0.0
422	ENDIF
423
424	CALL iom_close( inum )
425
426	ENDIF
427
428	!-----------------------------------------------------------------------
429	! Apply divergence damping filter
430	!-----------------------------------------------------------------------
431
432	IF ( ln_dyninc .AND. nn_divdmp > 0 ) THEN
433	!
434	CALL wrk_alloc( jpi,jpj, hdiv )
435	!
436	DO jt = 1, nn_divdmp
437	!
438	DO jk = 1, jpkm1 ! hdiv = e1e1 * div
439	hdiv(:,:) = 0._wp
440	DO jj = 2, jpjm1
441	DO ji = fs_2, fs_jpim1 ! vector opt.
442	hdiv(ji,jj) = ( e2u(ji ,jj) * e3u_n(ji ,jj,jk) * u_bkginc(ji ,jj,jk) &
443	& - e2u(ji-1,jj) * e3u_n(ji-1,jj,jk) * u_bkginc(ji-1,jj,jk) &
444	& + e1v(ji,jj ) * e3v_n(ji,jj ,jk) * v_bkginc(ji,jj ,jk) &
445	& - e1v(ji,jj-1) * e3v_n(ji,jj-1,jk) * v_bkginc(ji,jj-1,jk) ) / e3t_n(ji,jj,jk)
446	END DO
447	END DO
448	CALL lbc_lnk( hdiv, 'T', 1. ) ! lateral boundary cond. (no sign change)
449	!
450	DO jj = 2, jpjm1
451	DO ji = fs_2, fs_jpim1 ! vector opt.
452	u_bkginc(ji,jj,jk) = u_bkginc(ji,jj,jk) &
453	& + 0.2_wp * ( hdiv(ji+1,jj) - hdiv(ji ,jj) ) * r1_e1u(ji,jj) * umask(ji,jj,jk)
454	v_bkginc(ji,jj,jk) = v_bkginc(ji,jj,jk) &
455	& + 0.2_wp * ( hdiv(ji,jj+1) - hdiv(ji,jj ) ) * r1_e2v(ji,jj) * vmask(ji,jj,jk)
456	END DO
457	END DO
458	END DO
459	!
460	END DO
461	!
462	CALL wrk_dealloc( jpi,jpj, hdiv )
463	!
464	ENDIF
465
466	!-----------------------------------------------------------------------
467	! Allocate and initialize the background state arrays
468	!-----------------------------------------------------------------------
469
470	IF ( ln_asmdin ) THEN
471	!
472	ALLOCATE( t_bkg(jpi,jpj,jpk) )
473	ALLOCATE( s_bkg(jpi,jpj,jpk) )
474	ALLOCATE( u_bkg(jpi,jpj,jpk) )
475	ALLOCATE( v_bkg(jpi,jpj,jpk) )
476	ALLOCATE( ssh_bkg(jpi,jpj) )
477	!
478	t_bkg(:,:,:) = 0._wp
479	s_bkg(:,:,:) = 0._wp
480	u_bkg(:,:,:) = 0._wp
481	v_bkg(:,:,:) = 0._wp
482	ssh_bkg(:,:) = 0._wp
483	!
484	!--------------------------------------------------------------------
485	! Read from file the background state at analysis time
486	!--------------------------------------------------------------------
487	!
488	CALL iom_open( c_asmdin, inum )
489	!
490	CALL iom_get( inum, 'rdastp', zdate_bkg )
491	!
492	IF(lwp) THEN
493	WRITE(numout,*)
494	WRITE(numout,*) 'asm_inc_init : Assimilation background state valid at : ', &
495	& zdate_bkg
496	WRITE(numout,*) '~~~~~~~~~~~~'
497	ENDIF
498	!
499	IF ( zdate_bkg /= ditdin_date ) &
500	& CALL ctl_warn( ' Validity time of assimilation background state does', &
501	& ' not agree with Direct Initialization time' )
502	!
503	IF ( ln_trainc ) THEN
504	CALL iom_get( inum, jpdom_autoglo, 'tn', t_bkg )
505	CALL iom_get( inum, jpdom_autoglo, 'sn', s_bkg )
506	t_bkg(:,:,:) = t_bkg(:,:,:) * tmask(:,:,:)
507	s_bkg(:,:,:) = s_bkg(:,:,:) * tmask(:,:,:)
508	ENDIF
509	!
510	IF ( ln_dyninc ) THEN
511	CALL iom_get( inum, jpdom_autoglo, 'un', u_bkg )
512	CALL iom_get( inum, jpdom_autoglo, 'vn', v_bkg )
513	u_bkg(:,:,:) = u_bkg(:,:,:) * umask(:,:,:)
514	v_bkg(:,:,:) = v_bkg(:,:,:) * vmask(:,:,:)
515	ENDIF
516	!
517	IF ( ln_sshinc ) THEN
518	CALL iom_get( inum, jpdom_autoglo, 'sshn', ssh_bkg )
519	ssh_bkg(:,:) = ssh_bkg(:,:) * tmask(:,:,1)
520	ENDIF
521	!
522	CALL iom_close( inum )
523	!
524	ENDIF
525	!
526	END SUBROUTINE asm_inc_init
527	SUBROUTINE tra_asm_inc( kt )
528	!!----------------------------------------------------------------------
529	!! * ROUTINE tra_asm_inc *
530	!!
531	!! ** Purpose : Apply the tracer (T and S) assimilation increments
532	!!
533	!! ** Method : Direct initialization or Incremental Analysis Updating
534	!!
535	!! ** Action :
536	!!----------------------------------------------------------------------
537	INTEGER, INTENT(IN) :: kt ! Current time step
538	!
539	INTEGER :: ji, jj, jk
540	INTEGER :: it
541	REAL(wp) :: zincwgt ! IAU weight for current time step
542	REAL (wp), DIMENSION(jpi,jpj,jpk) :: fzptnz ! 3d freezing point values
543	!!----------------------------------------------------------------------
544	!
545	! freezing point calculation taken from oc_fz_pt (but calculated for all depths)
546	! used to prevent the applied increments taking the temperature below the local freezing point
547	DO jk = 1, jpkm1
548	CALL eos_fzp( tsn(:,:,jk,jp_sal), fzptnz(:,:,jk), gdept_n(:,:,jk) )
549	END DO
550	!
551	! !--------------------------------------
552	IF ( ln_asmiau ) THEN ! Incremental Analysis Updating
553	! !--------------------------------------
554	!
555	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
556	!
557	it = kt - nit000 + 1
558	zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step
559	!
560	IF(lwp) THEN
561	WRITE(numout,*)
562	WRITE(numout,*) 'tra_asm_inc : Tracer IAU at time step = ', kt,' with IAU weight = ', wgtiau(it)
563	WRITE(numout,*) '~~~~~~~~~~~~'
564	ENDIF
565	!
566	! Update the tracer tendencies
567	DO jk = 1, jpkm1
568	IF (ln_temnofreeze) THEN
569	! Do not apply negative increments if the temperature will fall below freezing
570	WHERE(t_bkginc(:,:,jk) > 0.0_wp .OR. &
571	& tsn(:,:,jk,jp_tem) + tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * wgtiau(it) > fzptnz(:,:,jk) )
572	tsa(:,:,jk,jp_tem) = tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * zincwgt
573	END WHERE
574	ELSE
575	tsa(:,:,jk,jp_tem) = tsa(:,:,jk,jp_tem) + t_bkginc(:,:,jk) * zincwgt
576	ENDIF
577	IF (ln_salfix) THEN
578	! Do not apply negative increments if the salinity will fall below a specified
579	! minimum value salfixmin
580	WHERE(s_bkginc(:,:,jk) > 0.0_wp .OR. &
581	& tsn(:,:,jk,jp_sal) + tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * wgtiau(it) > salfixmin )
582	tsa(:,:,jk,jp_sal) = tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * zincwgt
583	END WHERE
584	ELSE
585	tsa(:,:,jk,jp_sal) = tsa(:,:,jk,jp_sal) + s_bkginc(:,:,jk) * zincwgt
586	ENDIF
587	END DO
588	!
589	ENDIF
590	!
591	IF ( kt == nitiaufin_r + 1 ) THEN ! For bias crcn to work
592	DEALLOCATE( t_bkginc )
593	DEALLOCATE( s_bkginc )
594	ENDIF
595	! !--------------------------------------
596	ELSEIF ( ln_asmdin ) THEN ! Direct Initialization
597	! !--------------------------------------
598	!
599	IF ( kt == nitdin_r ) THEN
600	!
601	neuler = 0 ! Force Euler forward step
602	!
603	! Initialize the now fields with the background + increment
604	IF (ln_temnofreeze) THEN
605	! Do not apply negative increments if the temperature will fall below freezing
606	WHERE( t_bkginc(:,:,:) > 0.0_wp .OR. tsn(:,:,:,jp_tem) + t_bkginc(:,:,:) > fzptnz(:,:,:) )
607	tsn(:,:,:,jp_tem) = t_bkg(:,:,:) + t_bkginc(:,:,:)
608	END WHERE
609	ELSE
610	tsn(:,:,:,jp_tem) = t_bkg(:,:,:) + t_bkginc(:,:,:)
611	ENDIF
612	IF (ln_salfix) THEN
613	! Do not apply negative increments if the salinity will fall below a specified
614	! minimum value salfixmin
615	WHERE( s_bkginc(:,:,:) > 0.0_wp .OR. tsn(:,:,:,jp_sal) + s_bkginc(:,:,:) > salfixmin )
616	tsn(:,:,:,jp_sal) = s_bkg(:,:,:) + s_bkginc(:,:,:)
617	END WHERE
618	ELSE
619	tsn(:,:,:,jp_sal) = s_bkg(:,:,:) + s_bkginc(:,:,:)
620	ENDIF
621
622	tsb(:,:,:,:) = tsn(:,:,:,:) ! Update before fields
623
624	CALL eos( tsb, rhd, rhop, gdept_0(:,:,:) ) ! Before potential and in situ densities
625	!!gm fabien
626	! CALL eos( tsb, rhd, rhop ) ! Before potential and in situ densities
627	!!gm
628
629	IF( ln_zps .AND. .NOT. lk_c1d .AND. .NOT. ln_isfcav) &
630	& CALL zps_hde ( kt, jpts, tsb, gtsu, gtsv, & ! Partial steps: before horizontal gradient
631	& rhd, gru , grv ) ! of t, s, rd at the last ocean level
632	IF( ln_zps .AND. .NOT. lk_c1d .AND. ln_isfcav) &
633	& CALL zps_hde_isf( nit000, jpts, tsb, gtsu, gtsv, gtui, gtvi, & ! Partial steps for top cell (ISF)
634	& rhd, gru , grv , grui, grvi ) ! of t, s, rd at the last ocean level
635
636	DEALLOCATE( t_bkginc )
637	DEALLOCATE( s_bkginc )
638	DEALLOCATE( t_bkg )
639	DEALLOCATE( s_bkg )
640	ENDIF
641	!
642	ENDIF
643	! Perhaps the following call should be in step
644	IF ( ln_seaiceinc ) CALL seaice_asm_inc ( kt ) ! apply sea ice concentration increment
645	!
646	END SUBROUTINE tra_asm_inc
647
648
649	SUBROUTINE dyn_asm_inc( kt )
650	!!----------------------------------------------------------------------
651	!! * ROUTINE dyn_asm_inc *
652	!!
653	!! ** Purpose : Apply the dynamics (u and v) assimilation increments.
654	!!
655	!! ** Method : Direct initialization or Incremental Analysis Updating.
656	!!
657	!! ** Action :
658	!!----------------------------------------------------------------------
659	INTEGER, INTENT(IN) :: kt ! Current time step
660	!
661	INTEGER :: jk
662	INTEGER :: it
663	REAL(wp) :: zincwgt ! IAU weight for current time step
664	!!----------------------------------------------------------------------
665	!
666	! !--------------------------------------------
667	IF ( ln_asmiau ) THEN ! Incremental Analysis Updating
668	! !--------------------------------------------
669	!
670	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
671	!
672	it = kt - nit000 + 1
673	zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step
674	!
675	IF(lwp) THEN
676	WRITE(numout,*)
677	WRITE(numout,*) 'dyn_asm_inc : Dynamics IAU at time step = ', kt,' with IAU weight = ', wgtiau(it)
678	WRITE(numout,*) '~~~~~~~~~~~~'
679	ENDIF
680	!
681	! Update the dynamic tendencies
682	DO jk = 1, jpkm1
683	ua(:,:,jk) = ua(:,:,jk) + u_bkginc(:,:,jk) * zincwgt
684	va(:,:,jk) = va(:,:,jk) + v_bkginc(:,:,jk) * zincwgt
685	END DO
686	!
687	IF ( kt == nitiaufin_r ) THEN
688	DEALLOCATE( u_bkginc )
689	DEALLOCATE( v_bkginc )
690	ENDIF
691	!
692	ENDIF
693	! !-----------------------------------------
694	ELSEIF ( ln_asmdin ) THEN ! Direct Initialization
695	! !-----------------------------------------
696	!
697	IF ( kt == nitdin_r ) THEN
698	!
699	neuler = 0 ! Force Euler forward step
700	!
701	! Initialize the now fields with the background + increment
702	un(:,:,:) = u_bkg(:,:,:) + u_bkginc(:,:,:)
703	vn(:,:,:) = v_bkg(:,:,:) + v_bkginc(:,:,:)
704	!
705	ub(:,:,:) = un(:,:,:) ! Update before fields
706	vb(:,:,:) = vn(:,:,:)
707	!
708	DEALLOCATE( u_bkg )
709	DEALLOCATE( v_bkg )
710	DEALLOCATE( u_bkginc )
711	DEALLOCATE( v_bkginc )
712	ENDIF
713	!
714	ENDIF
715	!
716	END SUBROUTINE dyn_asm_inc
717
718
719	SUBROUTINE ssh_asm_inc( kt )
720	!!----------------------------------------------------------------------
721	!! * ROUTINE ssh_asm_inc *
722	!!
723	!! ** Purpose : Apply the sea surface height assimilation increment.
724	!!
725	!! ** Method : Direct initialization or Incremental Analysis Updating.
726	!!
727	!! ** Action :
728	!!----------------------------------------------------------------------
729	INTEGER, INTENT(IN) :: kt ! Current time step
730	!
731	INTEGER :: it
732	INTEGER :: jk
733	REAL(wp) :: zincwgt ! IAU weight for current time step
734	!!----------------------------------------------------------------------
735	!
736	! !-----------------------------------------
737	IF ( ln_asmiau ) THEN ! Incremental Analysis Updating
738	! !-----------------------------------------
739	!
740	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
741	!
742	it = kt - nit000 + 1
743	zincwgt = wgtiau(it) / rdt ! IAU weight for the current time step
744	!
745	IF(lwp) THEN
746	WRITE(numout,*)
747	WRITE(numout,*) 'ssh_asm_inc : SSH IAU at time step = ', &
748	& kt,' with IAU weight = ', wgtiau(it)
749	WRITE(numout,*) '~~~~~~~~~~~~'
750	ENDIF
751	!
752	! Save the tendency associated with the IAU weighted SSH increment
753	! (applied in dynspg.*)
754	#if defined key_asminc
755	ssh_iau(:,:) = ssh_bkginc(:,:) * zincwgt
756	#endif
757	IF ( kt == nitiaufin_r ) THEN
758	DEALLOCATE( ssh_bkginc )
759	ENDIF
760	!
761	ENDIF
762	! !-----------------------------------------
763	ELSEIF ( ln_asmdin ) THEN ! Direct Initialization
764	! !-----------------------------------------
765	!
766	IF ( kt == nitdin_r ) THEN
767	!
768	neuler = 0 ! Force Euler forward step
769	!
770	sshn(:,:) = ssh_bkg(:,:) + ssh_bkginc(:,:) ! Initialize the now fields the background + increment
771	!
772	sshb(:,:) = sshn(:,:) ! Update before fields
773	e3t_b(:,:,:) = e3t_n(:,:,:)
774	!!gm why not e3u_b, e3v_b, gdept_b ????
775	!
776	DEALLOCATE( ssh_bkg )
777	DEALLOCATE( ssh_bkginc )
778	!
779	ENDIF
780	!
781	ENDIF
782	!
783	END SUBROUTINE ssh_asm_inc
784
785
786	SUBROUTINE seaice_asm_inc( kt, kindic )
787	!!----------------------------------------------------------------------
788	!! * ROUTINE seaice_asm_inc *
789	!!
790	!! ** Purpose : Apply the sea ice assimilation increment.
791	!!
792	!! ** Method : Direct initialization or Incremental Analysis Updating.
793	!!
794	!! ** Action :
795	!!
796	!!----------------------------------------------------------------------
797	INTEGER, INTENT(in) :: kt ! Current time step
798	INTEGER, INTENT(in), OPTIONAL :: kindic ! flag for disabling the deallocation
799	!
800	INTEGER :: it
801	REAL(wp) :: zincwgt ! IAU weight for current time step
802	#if defined key_lim2
803	REAL(wp), DIMENSION(jpi,jpj) :: zofrld, zohicif, zseaicendg, zhicifinc ! LIM
804	REAL(wp) :: zhicifmin = 0.5_wp ! ice minimum depth in metres
805	#endif
806	!!----------------------------------------------------------------------
807	!
808	! !-----------------------------------------
809	IF ( ln_asmiau ) THEN ! Incremental Analysis Updating
810	! !-----------------------------------------
811	!
812	IF ( ( kt >= nitiaustr_r ).AND.( kt <= nitiaufin_r ) ) THEN
813	!
814	it = kt - nit000 + 1
815	zincwgt = wgtiau(it) ! IAU weight for the current time step
816	! note this is not a tendency so should not be divided by rdt (as with the tracer and other increments)
817	!
818	IF(lwp) THEN
819	WRITE(numout,*)
820	WRITE(numout,*) 'seaice_asm_inc : sea ice conc IAU at time step = ', kt,' with IAU weight = ', wgtiau(it)
821	WRITE(numout,*) '~~~~~~~~~~~~'
822	ENDIF
823	!
824	! Sea-ice : LIM-3 case (to add)
825	!
826	#if defined key_lim2
827	! Sea-ice : LIM-2 case
828	zofrld (:,:) = frld(:,:)
829	zohicif(:,:) = hicif(:,:)
830	!
831	frld = MIN( MAX( frld (:,:) - seaice_bkginc(:,:) * zincwgt, 0.0_wp), 1.0_wp)
832	pfrld = MIN( MAX( pfrld(:,:) - seaice_bkginc(:,:) * zincwgt, 0.0_wp), 1.0_wp)
833	fr_i(:,:) = 1.0_wp - frld(:,:) ! adjust ice fraction
834	!
835	zseaicendg(:,:) = zofrld(:,:) - frld(:,:) ! find out actual sea ice nudge applied
836	!
837	! Nudge sea ice depth to bring it up to a required minimum depth
838	WHERE( zseaicendg(:,:) > 0.0_wp .AND. hicif(:,:) < zhicifmin )
839	zhicifinc(:,:) = (zhicifmin - hicif(:,:)) * zincwgt
840	ELSEWHERE
841	zhicifinc(:,:) = 0.0_wp
842	END WHERE
843	!
844	! nudge ice depth
845	hicif (:,:) = hicif (:,:) + zhicifinc(:,:)
846	phicif(:,:) = phicif(:,:) + zhicifinc(:,:)
847	!
848	! seaice salinity balancing (to add)
849	#endif
850
851	#if defined key_cice && defined key_asminc
852	! Sea-ice : CICE case. Pass ice increment tendency into CICE
853	ndaice_da(:,:) = seaice_bkginc(:,:) * zincwgt / rdt
854	#endif
855
856	IF ( kt == nitiaufin_r ) THEN
857	DEALLOCATE( seaice_bkginc )
858	ENDIF
859
860	ELSE
861
862	#if defined key_cice && defined key_asminc
863	ndaice_da(:,:) = 0._wp ! Sea-ice : CICE case. Zero ice increment tendency into CICE
864	#endif
865
866	ENDIF
867	! !-----------------------------------------
868	ELSEIF ( ln_asmdin ) THEN ! Direct Initialization
869	! !-----------------------------------------
870	!
871	IF ( kt == nitdin_r ) THEN
872	!
873	neuler = 0 ! Force Euler forward step
874	!
875	! Sea-ice : LIM-3 case (to add)
876	!
877	#if defined key_lim2
878	! Sea-ice : LIM-2 case.
879	zofrld(:,:)=frld(:,:)
880	zohicif(:,:)=hicif(:,:)
881	!
882	! Initialize the now fields the background + increment
883	frld (:,:) = MIN( MAX( frld(:,:) - seaice_bkginc(:,:), 0.0_wp), 1.0_wp)
884	pfrld(:,:) = frld(:,:)
885	fr_i (:,:) = 1.0_wp - frld(:,:) ! adjust ice fraction
886	zseaicendg(:,:) = zofrld(:,:) - frld(:,:) ! find out actual sea ice nudge applied
887	!
888	! Nudge sea ice depth to bring it up to a required minimum depth
889	WHERE( zseaicendg(:,:) > 0.0_wp .AND. hicif(:,:) < zhicifmin )
890	zhicifinc(:,:) = (zhicifmin - hicif(:,:)) * zincwgt
891	ELSEWHERE
892	zhicifinc(:,:) = 0._wp
893	END WHERE
894	!
895	! nudge ice depth
896	hicif (:,:) = hicif (:,:) + zhicifinc(:,:)
897	phicif(:,:) = phicif(:,:)
898	!
899	! seaice salinity balancing (to add)
900	#endif
901	!
902	#if defined key_cice && defined key_asminc
903	! Sea-ice : CICE case. Pass ice increment tendency into CICE
904	ndaice_da(:,:) = seaice_bkginc(:,:) / rdt
905	#endif
906	IF ( .NOT. PRESENT(kindic) ) THEN
907	DEALLOCATE( seaice_bkginc )
908	END IF
909	!
910	ELSE
911	!
912	#if defined key_cice && defined key_asminc
913	ndaice_da(:,:) = 0._wp ! Sea-ice : CICE case. Zero ice increment tendency into CICE
914
915	#endif
916	!
917	ENDIF
918
919	!#if defined defined key_lim2 \|\| defined key_cice
920	!
921	! IF (ln_seaicebal ) THEN
922	! !! balancing salinity increments
923	! !! simple case from limflx.F90 (doesn't include a mass flux)
924	! !! assumption is that as ice concentration is reduced or increased
925	! !! the snow and ice depths remain constant
926	! !! note that snow is being created where ice concentration is being increased
927	! !! - could be more sophisticated and
928	! !! not do this (but would need to alter h_snow)
929	!
930	! usave(:,:,:)=sb(:,:,:) ! use array as a temporary store
931	!
932	! DO jj = 1, jpj
933	! DO ji = 1, jpi
934	! ! calculate change in ice and snow mass per unit area
935	! ! positive values imply adding salt to the ocean (results from ice formation)
936	! ! fwf : ice formation and melting
937	!
938	! zfons = ( -nfresh_da(ji,jj)soce + nfsalt_da(ji,jj) )rdt
939	!
940	! ! change salinity down to mixed layer depth
941	! mld=hmld_kara(ji,jj)
942	!
943	! ! prevent small mld
944	! ! less than 10m can cause salinity instability
945	! IF (mld < 10) mld=10
946	!
947	! ! set to bottom of a level
948	! DO jk = jpk-1, 2, -1
949	! IF ((mld > gdepw(ji,jj,jk)) .and. (mld < gdepw(ji,jj,jk+1))) THEN
950	! mld=gdepw(ji,jj,jk+1)
951	! jkmax=jk
952	! ENDIF
953	! ENDDO
954	!
955	! ! avoid applying salinity balancing in shallow water or on land
956	! !
957	!
958	! ! dsal_ocn (psu kg m^-2) / (kg m^-3 * m)
959	!
960	! dsal_ocn=0.0_wp
961	! sal_thresh=5.0_wp ! minimum salinity threshold for salinity balancing
962	!
963	! if (tmask(ji,jj,1) > 0 .AND. tmask(ji,jj,jkmax) > 0 ) &
964	! dsal_ocn = zfons / (rhop(ji,jj,1) * mld)
965	!
966	! ! put increments in for levels in the mixed layer
967	! ! but prevent salinity below a threshold value
968	!
969	! DO jk = 1, jkmax
970	!
971	! IF (dsal_ocn > 0.0_wp .or. sb(ji,jj,jk)+dsal_ocn > sal_thresh) THEN
972	! sb(ji,jj,jk) = sb(ji,jj,jk) + dsal_ocn
973	! sn(ji,jj,jk) = sn(ji,jj,jk) + dsal_ocn
974	! ENDIF
975	!
976	! ENDDO
977	!
978	! ! ! salt exchanges at the ice/ocean interface
979	! ! zpmess = zfons / rdt_ice ! rdt_ice is ice timestep
980	! !
981	! !! Adjust fsalt. A +ve fsalt means adding salt to ocean
982	! !! fsalt(ji,jj) = fsalt(ji,jj) + zpmess ! adjust fsalt
983	! !!
984	! !! emps(ji,jj) = emps(ji,jj) + zpmess ! or adjust emps (see icestp1d)
985	! !! ! E-P (kg m-2 s-2)
986	! ! emp(ji,jj) = emp(ji,jj) + zpmess ! E-P (kg m-2 s-2)
987	! ENDDO !ji
988	! ENDDO !jj!
989	!
990	! ENDIF !ln_seaicebal
991	!
992	!#endif
993	!
994	ENDIF
995	!
996	END SUBROUTINE seaice_asm_inc
997
998	!!======================================================================
999	END MODULE asminc

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