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limflx.F90 in branches/dev_002_LIM/NEMO/LIM_SRC_3 – NEMO

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source: branches/dev_002_LIM/NEMO/LIM_SRC_3/limflx.F90 @ 830

Last change on this file since 830 was 825, checked in by ctlod, 16 years ago
dev_002_LIM : add the LIM 3.0 component, see ticketr: #71
File size: 17.0 KB

Line
1	MODULE limflx
2	!!======================================================================
3	!! * MODULE limflx *
4	!! computation of the flux at the sea ice/ocean interface
5	!!======================================================================
6	#if defined key_lim3
7	!!----------------------------------------------------------------------
8	!! 'key_lim3' LIM sea-ice model
9	!!----------------------------------------------------------------------
10	!! lim_flx : flux at the ice / ocean interface
11	!! * Modules used
12	USE par_oce
13	USE phycst
14	USE ocfzpt
15	USE ice_oce
16	USE flx_oce
17	USE dom_oce
18	USE ice
19	USE flxblk
20	USE lbclnk
21	USE in_out_manager
22	USE albedo
23	USE limicepoints
24	USE par_ice
25	USE prtctl ! Print control
26
27	IMPLICIT NONE
28	PRIVATE
29
30	!! * Routine accessibility
31	PUBLIC lim_flx ! called by lim_step
32
33	!! * Module variables
34	REAL(wp) :: & ! constant values
35	epsi16 = 1e-16 , &
36	rzero = 0.0 , &
37	rone = 1.0
38	!! * Substitutions
39	# include "vectopt_loop_substitute.h90"
40	!!----------------------------------------------------------------------
41	!! LIM 2.0, UCL-LOCEAN-IPSL (2005)
42	!! $Header: /home/opalod/NEMOCVSROOT/NEMO/LIM_SRC/limflx.F90,v 1.6 2005/03/27 18:34:41 opalod Exp $
43	!! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt
44	!!----------------------------------------------------------------------
45	CONTAINS
46
47	SUBROUTINE lim_flx
48	!!-------------------------------------------------------------------
49	!! * ROUTINE lim_flx *
50	!!
51	!!
52	!! ** Purpose : Computes the mass and heat fluxes to the ocean
53	!!
54	!! ** Action : - Initialisation of some variables
55	!! - comput. of the fluxes at the sea ice/ocean interface
56	!!
57	!! ** Outputs : - fsolar : solar heat flux at sea ice/ocean interface
58	!! - fnsolar : non solar heat flux
59	!! - fsalt : salt flux at sea ice/ocean interface
60	!! - fmass : freshwater flux at sea ice/ocean interface
61	!!
62	!!
63	!! ** References :
64	!! H. Goosse et al. 1996, Bul. Soc. Roy. Sc. Liege, 65, 87-90
65	!! original : 00-01 (LIM)
66	!! addition : 02-07 (C. Ethe, G. Madec)
67	!!---------------------------------------------------------------------
68
69	!! * Modules used
70	!! * Local variables
71	INTEGER :: ji, jj, jl ! dummy loop indices
72
73	INTEGER :: &
74	ifvt, i1mfr, idfr , & ! some switches
75	iflt, ial, iadv, ifral, ifrdv
76
77	REAL(wp) :: &
78	zinda , & ! switch for testing the values of ice concentration
79	!! zfcm1 , & ! solar heat fluxes
80	!! zfcm2 , & ! non solar heat fluxes
81	zfold , &
82	zdfseqv, & ! increment to the ice salt flux
83	#if defined key_lim_fdd
84	zfons, & ! salt exchanges at the ice/ocean interface
85	zpme ! freshwater exchanges at the ice/ocean interface
86	#else
87	zprs , zfons, & ! salt exchanges at the ice/ocean interface
88	zpmess ! freshwater exchanges at the ice/ocean interface
89	#endif
90	REAL(wp), DIMENSION(jpi,jpj) :: &
91	zfcm1 , & ! solar heat fluxes
92	zfcm2 ! non solar heat fluxes
93	#if defined key_coupled
94	REAL(wp), DIMENSION(jpi,jpj) :: &
95	zalb , & ! albedo of ice under overcast sky
96	zalcn , & ! albedo of ocean under overcast sky
97	zalbp , & ! albedo of ice under clear sky
98	zaldum ! albedo of ocean under clear sky
99	#endif
100	!!---------------------------------------------------------------------
101
102	!---------------------------------!
103	! Sea ice/ocean interface !
104	!---------------------------------!
105
106	! heat flux at the ocean surface
107	!-------------------------------------------------------
108	! pfrld is the lead fraction at the previous time step (actually between TRP and THD)
109	! changed to old_frld and old ht_i
110
111	DO jj = 1, jpj
112	DO ji = 1, jpi
113	zinda = 1.0 - MAX( rzero , SIGN( rone , - ( 1.0 - pfrld(ji,jj) ) ) )
114	ifvt = zinda * MAX( rzero , SIGN( rone, -phicif (ji,jj) ) ) !subscripts are bad here
115	i1mfr = 1.0 - MAX( rzero , SIGN( rone , - ( at_i(ji,jj) ) ) )
116	idfr = 1.0 - MAX( rzero , SIGN( rone , ( 1.0 - at_i(ji,jj) ) - pfrld(ji,jj) ) )
117	iflt = zinda * (1 - i1mfr) * (1 - ifvt )
118	ial = ifvt * i1mfr + ( 1 - ifvt ) * idfr
119	iadv = ( 1 - i1mfr ) * zinda
120	ifral = ( 1 - i1mfr * ( 1 - ial ) )
121	ifrdv = ( 1 - ifral * ( 1 - ial ) ) * iadv
122
123	! switch --- 1.0 ---------------- 0.0 --------------------
124	! ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
125	! zinda \| if pfrld = 1 \| if pfrld < 1 \|
126	! -> ifvt\| if pfrld old_ht_i
127	! i1mfr \| if frld = 1 \| if frld < 1 \|
128	! idfr \| if frld <= pfrld \| if frld > pfrld \|
129	! iflt \|
130	! ial \|
131	! iadv \|
132	! ifral
133	! ifrdv
134
135	! computation the solar flux at ocean surface
136	zfcm1(ji,jj) = pfrld(ji,jj) * qsr_oce(ji,jj) + ( 1. - pfrld(ji,jj) ) * fstric(ji,jj)
137	! fstric Solar flux transmitted trough the ice
138	! qsr_oce Net short wave heat flux on free ocean
139	! new line
140	fscmbq(ji,jj) = ( 1.0 - pfrld(ji,jj) ) * fstric(ji,jj)
141
142	! computation the non solar heat flux at ocean surface
143	zfcm2(ji,jj) = - zfcm1(ji,jj) &
144	& + iflt * ( fscmbq(ji,jj) ) & ! total abl -> fscmbq is given to the ocean
145	! fscmbq and ffltbif are obsolete
146	! & + iflt * ffltbif(ji,jj) !!! only if one category is used
147	& + ifral * ( ial * qcmif(ji,jj) + (1 - ial) * qldif(ji,jj) ) / rdt_ice &
148	& + ifrdv * ( qfvbq(ji,jj) + qdtcn(ji,jj) ) / rdt_ice &
149	& + fhmec(ji,jj) & ! new contribution due to snow melt in ridging!!
150	& + fheat_rpo(ji,jj) & ! contribution from ridge formation
151	& + fheat_res(ji,jj)
152	! fscmbq Part of the solar radiation transmitted through the ice and going to the ocean
153	! computed in limthd_zdf.F90
154	! ffltbif Total heat content of the ice (brine pockets+ice) / delta_t
155	! qcmif Energy needed to bring the ocean surface layer until its freezing (ok)
156	! qldif heat balance of the lead (or of the open ocean)
157	! qfvbq i think this is wrong!
158	! ---> Array used to store energy in case of total lateral ablation
159	! qfvbq latent heat uptake/release after accretion/ablation
160	! qdtcn Energy from the turbulent oceanic heat flux heat flux coming in the lead
161
162	IF ( num_sal .EQ. 2 ) zfcm2(ji,jj) = zfcm2(ji,jj) + &
163	fhbri(ji,jj) ! new contribution due to brine drainage
164
165	! bottom radiative component is sent to the computation of the
166	! oceanic heat flux
167	fsbbq(ji,jj) = ( 1.0 - ( ifvt + iflt ) ) * fscmbq(ji,jj)
168
169	! used to compute the oceanic heat flux at the next time step
170	fsolar (ji,jj) = zfcm1(ji,jj) ! solar heat flux
171	fnsolar(ji,jj) = zfcm2(ji,jj) - fdtcn(ji,jj) ! non solar heat flux
172	! ! fdtcn : turbulent oceanic heat flux
173
174
175	IF ( ( ji .EQ. jiindex ) .AND. ( jj .EQ. jjindex) ) THEN
176	WRITE(numout,*) ' lim_flx : heat fluxes '
177	WRITE(numout,*) ' fsolar : ', fsolar(jiindex,jjindex)
178	WRITE(numout,*) ' zfcm1 : ', zfcm1(jiindex,jjindex)
179	WRITE(numout,*) ' pfrld : ', pfrld(jiindex,jjindex)
180	WRITE(numout,*) ' qsr_oce : ', qsr_oce(jiindex,jjindex)
181	WRITE(numout,*) ' fstric : ', fstric (jiindex,jjindex)
182	WRITE(numout,*)
183	WRITE(numout,*) ' fnsolar : ', fnsolar(jiindex,jjindex)
184	WRITE(numout,*) ' zfcm2 : ', zfcm2(jiindex,jjindex)
185	WRITE(numout,*) ' zfcm1 : ', zfcm1(jiindex,jjindex)
186	WRITE(numout,*) ' ifral : ', ifral
187	WRITE(numout,*) ' ial : ', ial
188	WRITE(numout,*) ' qcmif : ', qcmif(jiindex,jjindex)
189	WRITE(numout,*) ' qldif : ', qldif(jiindex,jjindex)
190	WRITE(numout,*) ' qcmif / dt: ', qcmif(jiindex,jjindex) / rdt_ice
191	WRITE(numout,*) ' qldif / dt: ', qldif(jiindex,jjindex) / rdt_ice
192	WRITE(numout,*) ' ifrdv : ', ifrdv
193	WRITE(numout,*) ' qfvbq : ', qfvbq(jiindex,jjindex)
194	WRITE(numout,*) ' qdtcn : ', qdtcn(jiindex,jjindex)
195	WRITE(numout,*) ' qfvbq / dt: ', qfvbq(jiindex,jjindex) / rdt_ice
196	WRITE(numout,*) ' qdtcn / dt: ', qdtcn(jiindex,jjindex) / rdt_ice
197	WRITE(numout,*) ' '
198	WRITE(numout,*) ' fdtcn : ', fdtcn(jiindex,jjindex)
199	WRITE(numout,*) ' fhmec : ', fhmec(jiindex,jjindex)
200	WRITE(numout,*) ' fheat_rpo : ', fheat_rpo(jiindex,jjindex)
201	WRITE(numout,*) ' fhbri : ', fhbri(jiindex,jjindex)
202	WRITE(numout,*) ' fheat_res : ', fheat_res(jiindex,jjindex)
203	ENDIF
204	END DO
205	END DO
206
207	! mass flux at the ocean surface
208	!-------------------------------------------------------
209	! DO jl = 1, jpl
210	! DO jj = 1, jpj
211	! DO ji = 1, jpi
212	! ! this is probably wrong since rdmicif has already been computed
213	! rdmicif(ji,jj) = rdmicif(ji,jj) + rhoic*d_v_i_thd(ji,jj,jl)
214	! END DO
215	! END DO
216	! END DO
217
218	DO jj = 1, jpj
219	DO ji = 1, jpi
220	#if defined key_lim_fdd
221	! case of realistic freshwater flux (Tartinville et al., 2001) (presently ACTIVATED)
222	! -------------------------------------------------------------------------------------
223	! The idea of this approach is that the system that we consider is the ICE-OCEAN system
224	! Thus FW flux = External ( E-P+snow melt)
225	! Salt flux = Exchanges in the ice-ocean system then converted into FW
226	! Associated to Ice formation AND Ice melting
227	! Even if i see Ice melting as a FW and SALT flux
228	!
229
230	! computing freshwater exchanges at the ice/ocean interface
231	zpme = - evap(ji,jj) * ( 1.0 - at_i(ji,jj) ) & ! evaporation over oceanic fraction
232	& + tprecip(ji,jj) & ! total precipitation
233	! old fashioned way
234	! & - sprecip(ji,jj) * ( 1. - pfrld(ji,jj) ) & ! remov. snow precip over ice
235	& - sprecip(ji,jj) * ( 1. - (pfrld(ji,jj)**betas) ) & ! remov. snow precip over ice
236	& - rdmsnif(ji,jj) / rdt_ice & ! freshwaterflux due to snow melting
237	! new contribution from snow falling when ridging
238	& + fmmec(ji,jj)
239
240	! computing salt exchanges at the ice/ocean interface
241	! sice should be the same as computed with the ice model
242	zfons = ( soce - sice ) * ( rdmicif(ji,jj) / rdt_ice )
243	! SOCE
244	zfons = ( sss_io(ji,jj) - sice ) * ( rdmicif(ji,jj) / rdt_ice )
245
246	! salt flux for constant salinity
247	fsalt(ji,jj) = zfons / ( sss_io(ji,jj) + epsi16 ) + fsalt_res(ji,jj)
248	zfold = fsalt(ji,jj)
249
250	! salt flux for variable salinity
251	zinda = 1.0 - MAX( rzero , SIGN( rone , - ( 1.0 - pfrld(ji,jj) ) ) )
252	!correcting brine and salt fluxes
253	fsbri(ji,jj) = zinda*fsbri(ji,jj)
254	! converting the salt fluxes from ice to a freshwater flux from ocean
255	fsalt_res(ji,jj) = fsalt_res(ji,jj) / ( sss_io(ji,jj) + epsi16 )
256	fseqv(ji,jj) = fseqv(ji,jj) / ( sss_io(ji,jj) + epsi16 )
257	fsbri(ji,jj) = fsbri(ji,jj) / ( sss_io(ji,jj) + epsi16 )
258	fsalt_rpo(ji,jj) = fsalt_rpo(ji,jj) / ( sss_io(ji,jj) + epsi16 )
259
260	! freshwater mass exchange (positive to the ice, negative for the ocean ?)
261	! actually it's a salt flux (so it's minus freshwater flux)
262	! if sea ice grows, zfons is positive, fsalt also
263	! POSITIVE SALT FLUX FROM THE ICE TO THE OCEAN
264	! POSITIVE FRESHWATER FLUX FROM THE OCEAN TO THE ICE [kg.m-2.s-1]
265
266	fmass(ji,jj) = - zpme
267
268	#else
269	!+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
270	! ON S'EN TAPE hhhhhhaaaaaaaaaaaaaaaaaahahahahahahahahahahahaha
271	!+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
272	! case of freshwater flux equivalent as salt flux
273	! dilution effect due to evaporation and precipitation
274	zprs = ( tprecip(ji,jj) - sprecip(ji,jj) * ( 1. - pfrld(ji,jj) ) ) * soce
275	!SOCE
276	zprs = ( tprecip(ji,jj) - sprecip(ji,jj) * ( 1. - pfrld(ji,jj) ) ) * sss_io(ji,jj)
277	! freshwater flux
278	zfons = rdmicif(ji,jj) * ( soce - sice ) & ! fwf : ice formation and melting
279	& - dmgwi(ji,jj) * sice & ! fwf : salt flx needed to bring the fresh snow to sea/ice salinity
280	& + rdmsnif(ji,jj) * soce ! fwf to ocean due to snow melting
281	!SOCE
282	zfons = rdmicif(ji,jj) * ( sss_io(ji,jj) - sice ) & ! fwf : ice formation and melting
283	& - dmgwi(ji,jj) * sice & ! fwf : salt flx needed to bring the fresh snow to sea/ice salinity
284	& + rdmsnif(ji,jj) * sss_io(ji,jj) ! fwf to ocean due to snow melting
285	! salt exchanges at the ice/ocean interface
286	zpmess = zprs - zfons / rdt_ice - evap(ji,jj) * soce * ( 1.0 - at_i(ji,jj) )
287	!SOCE
288	zpmess = zprs - zfons / rdt_ice - evap(ji,jj) * sss_io(ji,jj) * ( 1.0 - at_i(ji,jj) )
289
290	fsalt(ji,jj) = - zpmess
291	#endif
292	!+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
293
294	END DO
295	END DO
296
297	fsalt(:,:) = fseqv(:,:) + fsalt_res(:,:) + fsalt_rpo(:,:)
298	IF (num_sal.eq.2) THEN
299	!In case of variable salinity the salt flux has to be accounted for differently
300	! Brine drainage has to be added
301	fsalt(:,:) = fsbri(:,:) + fseqv(:,:) + fsalt_res(:,:) + fsalt_rpo(:,:)
302	ENDIF
303
304	!-------------------------------------------------------------------!
305	! computation of others transmitting variables from ice to ocean !
306	!------------------------------------------ ------------------------!
307
308	!-----------------------------------------------!
309	! Storing the transmitted variables !
310	!-----------------------------------------------!
311
312	ftaux (:,:) = - tio_u(:,:) * rau0 ! taux ( ice: N/m2/rau0, ocean: N/m2 )
313	ftauy (:,:) = - tio_v(:,:) * rau0 ! tauy ( ice: N/m2/rau0, ocean: N/m2 )
314	freeze(:,:) = at_i(:,:) ! Sea ice cover
315	tn_ice(:,:,:) = t_su(:,:,:)
316
317	#if defined key_coupled
318	zalb (:,:) = 0.e0
319	zalcn (:,:) = 0.e0
320	zalbp (:,:) = 0.e0
321	zaldum(:,:) = 0.e0
322
323	!------------------------------------------------!
324	! 2) Computation of snow/ice and ocean albedo !
325	!------------------------------------------------!
326	CALL flx_blk_albedo( zalb, zalcn, zalbp, zaldum )
327
328	alb_ice(:,:) = 0.5 * zalbp(:,:) + 0.5 * zalb (:,:) ! Ice albedo
329	#endif
330
331	IF(ln_ctl) THEN
332	CALL prt_ctl(tab2d_1=fsolar, clinfo1=' lim_flx: fsolar : ', tab2d_2=fnsolar, clinfo2=' fnsolar : ')
333	CALL prt_ctl(tab2d_1=fmass , clinfo1=' lim_flx: fmass : ', tab2d_2=fsalt , clinfo2=' fsalt : ')
334	CALL prt_ctl(tab2d_1=ftaux , clinfo1=' lim_flx: ftaux : ', tab2d_2=ftauy , clinfo2=' ftauy : ')
335	CALL prt_ctl(tab2d_1=freeze, clinfo1=' lim_flx: freeze : ')
336	CALL prt_ctl(tab3d_1=tn_ice, clinfo1=' lim_flx: tn_ice : ', kdim=jpl)
337	ENDIF
338
339	END SUBROUTINE lim_flx
340
341	#else
342	!!----------------------------------------------------------------------
343	!! Default option : Empty module NO LIM sea-ice model
344	!!----------------------------------------------------------------------
345	CONTAINS
346	SUBROUTINE lim_flx ! Empty routine
347	END SUBROUTINE lim_flx
348	#endif
349
350	END MODULE limflx

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