1 | MODULE limthd_sal |
---|
2 | !!---------------------------------------------------------------------- |
---|
3 | !! 'key_lim3' LIM3 sea-ice model |
---|
4 | !!---------------------------------------------------------------------- |
---|
5 | !!====================================================================== |
---|
6 | !! *** MODULE limthd_sal *** |
---|
7 | !! computation salinity variations in |
---|
8 | !! the ice |
---|
9 | !!====================================================================== |
---|
10 | #if defined key_lim3 |
---|
11 | !!---------------------------------------------------------------------- |
---|
12 | !! lim_thd_sal : salinity variations in the ice |
---|
13 | !! * Modules used |
---|
14 | USE par_oce ! ocean parameters |
---|
15 | USE phycst ! physical constants (ocean directory) |
---|
16 | USE sbc_oce ! Surface boundary condition: ocean fields |
---|
17 | USE thd_ice |
---|
18 | USE iceini |
---|
19 | USE ice |
---|
20 | USE limistate |
---|
21 | USE in_out_manager |
---|
22 | USE limvar |
---|
23 | USE par_ice |
---|
24 | |
---|
25 | IMPLICIT NONE |
---|
26 | PRIVATE |
---|
27 | |
---|
28 | !! * Routine accessibility |
---|
29 | PUBLIC lim_thd_sal ! called by lim_thd |
---|
30 | PUBLIC lim_thd_sal_init ! called by lim_thd |
---|
31 | |
---|
32 | !! * Module variables |
---|
33 | REAL(wp) :: & ! constant values |
---|
34 | epsi20 = 1e-20 , & |
---|
35 | epsi13 = 1e-13 , & |
---|
36 | zzero = 0.e0 , & |
---|
37 | zone = 1.e0 |
---|
38 | |
---|
39 | !!---------------------------------------------------------------------- |
---|
40 | !! LIM 3.0, UCL-ASTR-LOCEAN-IPSL (2008) |
---|
41 | !! $Id$ |
---|
42 | !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt) |
---|
43 | !!---------------------------------------------------------------------- |
---|
44 | |
---|
45 | CONTAINS |
---|
46 | |
---|
47 | SUBROUTINE lim_thd_sal(kideb,kiut) |
---|
48 | !!------------------------------------------------------------------- |
---|
49 | !! *** ROUTINE lim_thd_sal *** |
---|
50 | !! ** Purpose : |
---|
51 | !! This routine computes new salinities in the ice |
---|
52 | !! |
---|
53 | !! ** Method : 4 possibilities |
---|
54 | !! -> num_sal = 1 -> constant salinity for z,t |
---|
55 | !! -> num_sal = 2 -> S = S(z,t) [simple Vancoppenolle et al 2005] |
---|
56 | !! -> num_sal = 3 -> S = S(z) [multiyear ice] |
---|
57 | !! -> num_sal = 4 -> S = S(h) [Cox and Weeks 74] |
---|
58 | !! |
---|
59 | !! ** Steps |
---|
60 | !! |
---|
61 | !! ** Arguments |
---|
62 | !! |
---|
63 | !! ** Inputs / Outputs |
---|
64 | !! |
---|
65 | !! ** External |
---|
66 | !! |
---|
67 | !! ** References |
---|
68 | !! |
---|
69 | !! ** History : |
---|
70 | !! |
---|
71 | !! "Je ne suis pour l'instant qu'a 80% de ma condition, mais c'est |
---|
72 | !! les 30% qui restent qui seront les plus difficiles" |
---|
73 | !! E. Mpenza |
---|
74 | !! |
---|
75 | !!------------------------------------------------------------------- |
---|
76 | !! History : |
---|
77 | !! ori ! 03-05 M. Vancoppenolle UCL-ASTR first coding for LIM-1D |
---|
78 | !! 3.0 ! 05-12 Routine rewritten for the 3-D version |
---|
79 | !!--------------------------------------------------------------------- |
---|
80 | !! |
---|
81 | !! * Local variables |
---|
82 | INTEGER, INTENT(in) :: & |
---|
83 | kideb, kiut !: thickness category index |
---|
84 | |
---|
85 | INTEGER :: & |
---|
86 | ji, jk , & !: geographic and layer index |
---|
87 | zji, zjj |
---|
88 | |
---|
89 | REAL(wp) :: & |
---|
90 | zsold, & !: old salinity |
---|
91 | zeps=1.0e-06 , & !: very small |
---|
92 | iflush , & !: flushing (1) or not (0) |
---|
93 | iaccrbo , & !: bottom accretion (1) or not (0) |
---|
94 | igravdr , & !: gravity drainage or not |
---|
95 | isnowic , & !: gravity drainage or not |
---|
96 | i_ice_switch , & !: ice thickness above a certain treshold or not |
---|
97 | ztmelts , & !: freezing point of sea ice |
---|
98 | zaaa , & !: dummy factor |
---|
99 | zbbb , & !: dummy factor |
---|
100 | zccc , & !: dummy factor |
---|
101 | zdiscrim !: dummy factor |
---|
102 | |
---|
103 | REAL(wp), DIMENSION(jpij) :: & |
---|
104 | ze_init , & !initial total enthalpy |
---|
105 | zhiold , & |
---|
106 | zsiold |
---|
107 | |
---|
108 | !!--------------------------------------------------------------------- |
---|
109 | |
---|
110 | !------------------------------------------------------------------------------| |
---|
111 | ! 1) Constant salinity, constant in time | |
---|
112 | !------------------------------------------------------------------------------| |
---|
113 | |
---|
114 | IF (num_sal.eq.1) THEN |
---|
115 | |
---|
116 | ! WRITE(numout,*) |
---|
117 | ! WRITE(numout,*) 'lim_thd_sal : Ice salinity computation module ', & |
---|
118 | ! num_sal |
---|
119 | ! WRITE(numout,*) '~~~~~~~~~~~~' |
---|
120 | |
---|
121 | DO jk = 1, nlay_i |
---|
122 | DO ji = kideb, kiut |
---|
123 | s_i_b(ji,jk) = bulk_sal |
---|
124 | END DO ! ji |
---|
125 | END DO ! jk |
---|
126 | |
---|
127 | DO ji = kideb, kiut |
---|
128 | sm_i_b(ji) = bulk_sal |
---|
129 | END DO ! ji |
---|
130 | |
---|
131 | ENDIF ! num_sal .EQ. 1 |
---|
132 | |
---|
133 | !------------------------------------------------------------------------------| |
---|
134 | ! Module 2 : Constant salinity varying in time | |
---|
135 | !------------------------------------------------------------------------------| |
---|
136 | |
---|
137 | IF ( ( num_sal .EQ. 2 ) .OR. ( num_sal .EQ. 4 ) ) THEN |
---|
138 | |
---|
139 | ! WRITE(numout,*) |
---|
140 | ! WRITE(numout,*) 'lim_thd_sal : Ice salinity computation module ', & |
---|
141 | ! num_sal |
---|
142 | ! WRITE(numout,*) '~~~~~~~~~~~' |
---|
143 | ! WRITE(numout,*) |
---|
144 | |
---|
145 | !--------------------------------- |
---|
146 | ! Thickness at previous time step |
---|
147 | !--------------------------------- |
---|
148 | DO ji = kideb, kiut |
---|
149 | zhiold(ji) = ht_i_b(ji) - dh_i_bott(ji) - dh_snowice(ji) - & |
---|
150 | dh_i_surf(ji) |
---|
151 | END DO ! ji |
---|
152 | |
---|
153 | !--------------------- |
---|
154 | ! Global heat content |
---|
155 | !--------------------- |
---|
156 | |
---|
157 | ze_init(:) = 0.0 |
---|
158 | DO jk = 1, nlay_i |
---|
159 | DO ji = kideb, kiut |
---|
160 | ze_init(ji) = ze_init(ji) + q_i_b(ji,jk) * ht_i_b(ji) / nlay_i |
---|
161 | END DO ! ji |
---|
162 | END DO ! jk |
---|
163 | |
---|
164 | DO ji = kideb, kiut |
---|
165 | |
---|
166 | !---------- |
---|
167 | ! Switches |
---|
168 | !---------- |
---|
169 | |
---|
170 | ! iflush : 1 if summer |
---|
171 | iflush = MAX( 0.0 , SIGN ( 1.0 , t_su_b(ji) - rtt ) ) |
---|
172 | ! igravdr : 1 if t_su lt t_bo |
---|
173 | igravdr = MAX( 0.0 , SIGN ( 1.0 , t_bo_b(ji) - t_su_b(ji) ) ) |
---|
174 | ! iaccrbo : 1 if bottom accretion |
---|
175 | iaccrbo = MAX( 0.0 , SIGN ( 1.0 , dh_i_bott(ji) ) ) |
---|
176 | ! isnowic : 1 if snow ice formation |
---|
177 | i_ice_switch = 1.0 - MAX ( 0.0 , SIGN ( 1.0 , - ht_i_b(ji) + 1.0e-2 ) ) |
---|
178 | isnowic = 1.0 - MAX ( 0.0 , SIGN ( 1.0 , - dh_snowice(ji) ) ) * & |
---|
179 | i_ice_switch |
---|
180 | |
---|
181 | !--------------------- |
---|
182 | ! Salinity tendencies |
---|
183 | !--------------------- |
---|
184 | |
---|
185 | ! drainage by gravity drainage |
---|
186 | dsm_i_gd_1d(ji) = - igravdr * & |
---|
187 | MAX( sm_i_b(ji) - sal_G , 0.0 ) / & |
---|
188 | time_G * rdt_ice |
---|
189 | |
---|
190 | ! drainage by flushing |
---|
191 | dsm_i_fl_1d(ji) = - iflush * & |
---|
192 | MAX( sm_i_b(ji) - sal_F , 0.0 ) / & |
---|
193 | time_F * rdt_ice |
---|
194 | |
---|
195 | !----------------- |
---|
196 | ! Update salinity |
---|
197 | !----------------- |
---|
198 | |
---|
199 | ! only drainage terms ( gravity drainage and flushing ) |
---|
200 | ! snow ice / bottom sources are added in lim_thd_ent |
---|
201 | ! to conserve energy |
---|
202 | zsiold(ji) = sm_i_b(ji) |
---|
203 | sm_i_b(ji) = sm_i_b(ji) & |
---|
204 | + dsm_i_fl_1d(ji) + dsm_i_gd_1d(ji) ! & |
---|
205 | |
---|
206 | ! if no ice, salinity eq 0.1 |
---|
207 | i_ice_switch = 1.0 - MAX ( 0.0, SIGN (1.0 , - ht_i_b(ji) ) ) |
---|
208 | sm_i_b(ji) = i_ice_switch*sm_i_b(ji) + s_i_min * ( 1.0 - & |
---|
209 | i_ice_switch ) |
---|
210 | END DO ! ji |
---|
211 | |
---|
212 | ! Salinity profile |
---|
213 | CALL lim_var_salprof1d(kideb,kiut) |
---|
214 | |
---|
215 | !---------------------------- |
---|
216 | ! Heat flux - brine drainage |
---|
217 | !---------------------------- |
---|
218 | |
---|
219 | DO ji = kideb, kiut |
---|
220 | ! iflush : 1 if summer |
---|
221 | iflush = MAX( 0.0 , SIGN ( 1.0 , t_su_b(ji) - rtt ) ) |
---|
222 | ! igravdr : 1 if t_su lt t_bo |
---|
223 | igravdr = MAX( 0.0 , SIGN ( 1.0 , t_bo_b(ji) - t_su_b(ji) ) ) |
---|
224 | ! iaccrbo : 1 if bottom accretion |
---|
225 | iaccrbo = MAX( 0.0 , SIGN ( 1.0 , dh_i_bott(ji) ) ) |
---|
226 | |
---|
227 | fhbri_1d(ji) = 0.0 |
---|
228 | END DO ! ji |
---|
229 | |
---|
230 | !---------------------------- |
---|
231 | ! Salt flux - brine drainage |
---|
232 | !---------------------------- |
---|
233 | DO ji = kideb, kiut |
---|
234 | i_ice_switch = 1.0 - MAX ( 0.0, SIGN (1.0 , - ht_i_b(ji) ) ) |
---|
235 | fsbri_1d(ji) = fsbri_1d(ji) - & |
---|
236 | i_ice_switch * rhoic * a_i_b(ji) * ht_i_b(ji) * & |
---|
237 | ( MAX(dsm_i_gd_1d(ji) + dsm_i_fl_1d(ji), & |
---|
238 | sm_i_b(ji) - zsiold(ji) ) ) / rdt_ice |
---|
239 | IF ( num_sal .EQ. 4 ) fsbri_1d(ji) = 0.0 |
---|
240 | |
---|
241 | END DO ! ji |
---|
242 | |
---|
243 | ! Only necessary for conservation check since salinity is modified |
---|
244 | !-------------------- |
---|
245 | ! Temperature update |
---|
246 | !-------------------- |
---|
247 | DO jk = 1, nlay_i |
---|
248 | |
---|
249 | DO ji = kideb, kiut |
---|
250 | |
---|
251 | ztmelts = -tmut*s_i_b(ji,jk) + rtt |
---|
252 | !Conversion q(S,T) -> T (second order equation) |
---|
253 | zaaa = cpic |
---|
254 | zbbb = ( rcp - cpic ) * ( ztmelts - rtt ) + & |
---|
255 | q_i_b(ji,jk) / rhoic - lfus |
---|
256 | zccc = lfus * ( ztmelts - rtt ) |
---|
257 | zdiscrim = SQRT( MAX(zbbb*zbbb - 4.0*zaaa*zccc,0.0) ) |
---|
258 | t_i_b(ji,jk) = rtt - ( zbbb + zdiscrim ) / & |
---|
259 | ( 2.0 *zaaa ) |
---|
260 | END DO !ji |
---|
261 | |
---|
262 | END DO !jk |
---|
263 | |
---|
264 | ENDIF ! num_sal .EQ. 2 |
---|
265 | |
---|
266 | !------------------------------------------------------------------------------| |
---|
267 | ! Module 3 : Profile of salinity, constant in time | |
---|
268 | !------------------------------------------------------------------------------| |
---|
269 | |
---|
270 | IF ( num_sal .EQ. 3 ) THEN |
---|
271 | |
---|
272 | WRITE(numout,*) |
---|
273 | WRITE(numout,*) 'lim_thd_sal : Ice salinity computation module ', & |
---|
274 | num_sal |
---|
275 | WRITE(numout,*) '~~~~~~~~~~~~' |
---|
276 | |
---|
277 | CALL lim_var_salprof1d(kideb,kiut) |
---|
278 | |
---|
279 | ENDIF ! num_sal .EQ. 3 |
---|
280 | |
---|
281 | !------------------------------------------------------------------------------| |
---|
282 | ! Module 4 : Constant salinity varying in time | |
---|
283 | !------------------------------------------------------------------------------| |
---|
284 | |
---|
285 | ! Cox and Weeks, 1974 |
---|
286 | IF (num_sal.eq.5) THEN |
---|
287 | |
---|
288 | WRITE(numout,*) |
---|
289 | WRITE(numout,*) 'lim_thd_sal : Ice salinity computation module ', & |
---|
290 | num_sal |
---|
291 | WRITE(numout,*) '~~~~~~~~~~~~' |
---|
292 | |
---|
293 | DO ji = kideb, kiut |
---|
294 | |
---|
295 | zsold = sm_i_b(ji) |
---|
296 | |
---|
297 | IF (ht_i_b(ji).lt.0.4) THEN |
---|
298 | sm_i_b(ji) = 14.24 - 19.39*ht_i_b(ji) |
---|
299 | ELSE |
---|
300 | sm_i_b(ji) = 7.88 - 1.59*ht_i_b(ji) |
---|
301 | sm_i_b(ji) = MIN(sm_i_b(ji),zsold) |
---|
302 | ENDIF |
---|
303 | |
---|
304 | IF ( ht_i_b(ji) .GT. 3.06918239 ) THEN |
---|
305 | sm_i_b(ji) = 3.0 |
---|
306 | ENDIF |
---|
307 | |
---|
308 | DO jk = 1, nlay_i |
---|
309 | s_i_b(ji,jk) = sm_i_b(ji) |
---|
310 | END DO |
---|
311 | |
---|
312 | END DO ! ji |
---|
313 | |
---|
314 | ENDIF ! num_sal |
---|
315 | |
---|
316 | !------------------------------------------------------------------------------| |
---|
317 | ! 5) Computation of salt flux due to Bottom growth |
---|
318 | !------------------------------------------------------------------------------| |
---|
319 | |
---|
320 | IF ( num_sal .EQ. 4 ) THEN |
---|
321 | DO ji = kideb, kiut |
---|
322 | zji = MOD( npb(ji) - 1, jpi ) + 1 |
---|
323 | zjj = ( npb(ji) - 1 ) / jpi + 1 |
---|
324 | fseqv_1d(ji) = fseqv_1d(ji) + & |
---|
325 | ( sss_m(zji,zjj) - bulk_sal ) * & |
---|
326 | rhoic * a_i_b(ji) * & |
---|
327 | MAX( dh_i_bott(ji) , 0.0 ) / rdt_ice |
---|
328 | END DO |
---|
329 | ELSE |
---|
330 | DO ji = kideb, kiut |
---|
331 | zji = MOD( npb(ji) - 1, jpi ) + 1 |
---|
332 | zjj = ( npb(ji) - 1 ) / jpi + 1 |
---|
333 | fseqv_1d(ji) = fseqv_1d(ji) + & |
---|
334 | ( sss_m(zji,zjj) - s_i_new(ji) ) * & |
---|
335 | rhoic * a_i_b(ji) * & |
---|
336 | MAX( dh_i_bott(ji) , 0.0 ) / rdt_ice |
---|
337 | END DO ! ji |
---|
338 | ENDIF |
---|
339 | |
---|
340 | !-- End of salinity computations |
---|
341 | END SUBROUTINE lim_thd_sal |
---|
342 | !============================================================================== |
---|
343 | |
---|
344 | SUBROUTINE lim_thd_sal_init |
---|
345 | !!------------------------------------------------------------------- |
---|
346 | !! *** ROUTINE lim_thd_sal_init *** |
---|
347 | !! |
---|
348 | !! ** Purpose : initialization of ice salinity parameters |
---|
349 | !! |
---|
350 | !! ** Method : Read the namicesal namelist and check the parameter |
---|
351 | !! values called at the first timestep (nit000) |
---|
352 | !! |
---|
353 | !! ** input : Namelist namicesal |
---|
354 | !! |
---|
355 | !! history : |
---|
356 | !! 3.0 ! July 2005 M. Vancoppenolle Original code |
---|
357 | !!------------------------------------------------------------------- |
---|
358 | NAMELIST/namicesal/ num_sal, bulk_sal, sal_G, time_G, sal_F, time_F, & |
---|
359 | s_i_max, s_i_min, s_i_0, s_i_1 |
---|
360 | !!------------------------------------------------------------------- |
---|
361 | |
---|
362 | ! Read Namelist namicesal |
---|
363 | REWIND ( numnam_ice ) |
---|
364 | READ ( numnam_ice , namicesal ) |
---|
365 | IF(lwp) THEN |
---|
366 | WRITE(numout,*) |
---|
367 | WRITE(numout,*) 'lim_thd_sal_init : Ice parameters for salinity ' |
---|
368 | WRITE(numout,*) '~~~~~~~~~~~~~~~~' |
---|
369 | WRITE(numout,*) ' switch for salinity num_sal : ', num_sal |
---|
370 | WRITE(numout,*) ' bulk salinity value if num_sal = 1 : ', bulk_sal |
---|
371 | WRITE(numout,*) ' restoring salinity for GD : ', sal_G |
---|
372 | WRITE(numout,*) ' restoring time for GD : ', time_G |
---|
373 | WRITE(numout,*) ' restoring salinity for flushing : ', sal_F |
---|
374 | WRITE(numout,*) ' restoring time for flushing : ', time_F |
---|
375 | WRITE(numout,*) ' Maximum tolerated ice salinity : ', s_i_max |
---|
376 | WRITE(numout,*) ' Minimum tolerated ice salinity : ', s_i_min |
---|
377 | WRITE(numout,*) ' 1st salinity for salinity profile : ', s_i_0 |
---|
378 | WRITE(numout,*) ' 2nd salinity for salinity profile : ', s_i_1 |
---|
379 | ENDIF |
---|
380 | |
---|
381 | END SUBROUTINE lim_thd_sal_init |
---|
382 | |
---|
383 | #else |
---|
384 | !!---------------------------------------------------------------------- |
---|
385 | !! Default option Empty Module No sea-ice model |
---|
386 | !!---------------------------------------------------------------------- |
---|
387 | CONTAINS |
---|
388 | SUBROUTINE lim_thd_sal ! Empty routine |
---|
389 | END SUBROUTINE lim_thd_sal |
---|
390 | #endif |
---|
391 | !!====================================================================== |
---|
392 | END MODULE limthd_sal |
---|