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sbcblk_core.F90 in branches/2012/dev_r3385_NOCS04_HAMF/NEMOGCM/NEMO/OPA_SRC/SBC – NEMO

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source: branches/2012/dev_r3385_NOCS04_HAMF/NEMOGCM/NEMO/OPA_SRC/SBC/sbcblk_core.F90 @ 3402

Last change on this file since 3402 was 3402, checked in by acc, 12 years ago
Branch: dev_r3385_NOCS04_HAMF; #665. Stage 2 of 2012 development: suppression of emps array and introduction of sfx (salt flux) array with associated code to setup the options for embedding the seaice into the ocean
Property svn:keywords set to `Id`
File size: 53.8 KB

Line
1	MODULE sbcblk_core
2	!!======================================================================
3	!! * MODULE sbcblk_core *
4	!! Ocean forcing: momentum, heat and freshwater flux formulation
5	!!=====================================================================
6	!! History : 1.0 ! 2004-08 (U. Schweckendiek) Original code
7	!! 2.0 ! 2005-04 (L. Brodeau, A.M. Treguier) additions:
8	!! - new bulk routine for efficiency
9	!! - WINDS ARE NOW ASSUMED TO BE AT T POINTS in input files !!!!
10	!! - file names and file characteristics in namelist
11	!! - Implement reading of 6-hourly fields
12	!! 3.0 ! 2006-06 (G. Madec) sbc rewritting
13	!! - ! 2006-12 (L. Brodeau) Original code for TURB_CORE_2Z
14	!! 3.2 ! 2009-04 (B. Lemaire) Introduce iom_put
15	!! 3.3 ! 2010-10 (S. Masson) add diurnal cycle
16	!! 3.4 ! 2011-11 (C. Harris) Fill arrays required by CICE
17	!!----------------------------------------------------------------------
18
19	!!----------------------------------------------------------------------
20	!! sbc_blk_core : bulk formulation as ocean surface boundary condition
21	!! (forced mode, CORE bulk formulea)
22	!! blk_oce_core : ocean: computes momentum, heat and freshwater fluxes
23	!! blk_ice_core : ice : computes momentum, heat and freshwater fluxes
24	!! turb_core : computes the CORE turbulent transfer coefficients
25	!!----------------------------------------------------------------------
26	USE oce ! ocean dynamics and tracers
27	USE dom_oce ! ocean space and time domain
28	USE phycst ! physical constants
29	USE fldread ! read input fields
30	USE sbc_oce ! Surface boundary condition: ocean fields
31	USE sbcdcy ! surface boundary condition: diurnal cycle
32	USE iom ! I/O manager library
33	USE in_out_manager ! I/O manager
34	USE lib_mpp ! distribued memory computing library
35	USE wrk_nemo ! work arrays
36	USE timing ! Timing
37	USE lbclnk ! ocean lateral boundary conditions (or mpp link)
38	USE prtctl ! Print control
39	USE sbcwave,ONLY : cdn_wave !wave module
40	#if defined key_lim3 \|\| defined key_cice
41	USE sbc_ice ! Surface boundary condition: ice fields
42	#endif
43
44	IMPLICIT NONE
45	PRIVATE
46
47	PUBLIC sbc_blk_core ! routine called in sbcmod module
48	PUBLIC blk_ice_core ! routine called in sbc_ice_lim module
49	PUBLIC turb_core_2z ! routine calles in sbcblk_mfs module
50
51	INTEGER , PARAMETER :: jpfld = 9 ! maximum number of files to read
52	INTEGER , PARAMETER :: jp_wndi = 1 ! index of 10m wind velocity (i-component) (m/s) at T-point
53	INTEGER , PARAMETER :: jp_wndj = 2 ! index of 10m wind velocity (j-component) (m/s) at T-point
54	INTEGER , PARAMETER :: jp_humi = 3 ! index of specific humidity ( % )
55	INTEGER , PARAMETER :: jp_qsr = 4 ! index of solar heat (W/m2)
56	INTEGER , PARAMETER :: jp_qlw = 5 ! index of Long wave (W/m2)
57	INTEGER , PARAMETER :: jp_tair = 6 ! index of 10m air temperature (Kelvin)
58	INTEGER , PARAMETER :: jp_prec = 7 ! index of total precipitation (rain+snow) (Kg/m2/s)
59	INTEGER , PARAMETER :: jp_snow = 8 ! index of snow (solid prcipitation) (kg/m2/s)
60	INTEGER , PARAMETER :: jp_tdif = 9 ! index of tau diff associated to HF tau (N/m2) at T-point
61
62	TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf ! structure of input fields (file informations, fields read)
63
64	! !!! CORE bulk parameters
65	REAL(wp), PARAMETER :: rhoa = 1.22 ! air density
66	REAL(wp), PARAMETER :: cpa = 1000.5 ! specific heat of air
67	REAL(wp), PARAMETER :: Lv = 2.5e6 ! latent heat of vaporization
68	REAL(wp), PARAMETER :: Ls = 2.839e6 ! latent heat of sublimation
69	REAL(wp), PARAMETER :: Stef = 5.67e-8 ! Stefan Boltzmann constant
70	REAL(wp), PARAMETER :: Cice = 1.63e-3 ! transfer coefficient over ice
71	REAL(wp), PARAMETER :: albo = 0.066 ! ocean albedo assumed to be constant
72
73	! !!* Namelist namsbc_core : CORE bulk parameters
74	LOGICAL :: ln_2m = .FALSE. ! logical flag for height of air temp. and hum
75	LOGICAL :: ln_taudif = .FALSE. ! logical flag to use the "mean of stress module - module of mean stress" data
76	REAL(wp) :: rn_pfac = 1. ! multiplication factor for precipitation
77
78	!! * Substitutions
79	# include "domzgr_substitute.h90"
80	# include "vectopt_loop_substitute.h90"
81	!!----------------------------------------------------------------------
82	!! NEMO/OPA 3.3 , NEMO-consortium (2010)
83	!! $Id$
84	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
85	!!----------------------------------------------------------------------
86	CONTAINS
87
88	SUBROUTINE sbc_blk_core( kt )
89	!!---------------------------------------------------------------------
90	!! * ROUTINE sbc_blk_core *
91	!!
92	!! ** Purpose : provide at each time step the surface ocean fluxes
93	!! (momentum, heat, freshwater and runoff)
94	!!
95	!! ** Method : (1) READ each fluxes in NetCDF files:
96	!! the 10m wind velocity (i-component) (m/s) at T-point
97	!! the 10m wind velocity (j-component) (m/s) at T-point
98	!! the 10m or 2m specific humidity ( % )
99	!! the solar heat (W/m2)
100	!! the Long wave (W/m2)
101	!! the 10m or 2m air temperature (Kelvin)
102	!! the total precipitation (rain+snow) (Kg/m2/s)
103	!! the snow (solid prcipitation) (kg/m2/s)
104	!! the tau diff associated to HF tau (N/m2) at T-point (ln_taudif=T)
105	!! (2) CALL blk_oce_core
106	!!
107	!! C A U T I O N : never mask the surface stress fields
108	!! the stress is assumed to be in the (i,j) mesh referential
109	!!
110	!! ** Action : defined at each time-step at the air-sea interface
111	!! - utau, vtau i- and j-component of the wind stress
112	!! - taum, wndm wind stress and 10m wind modules at T-point
113	!! - qns, qsr non-solar and solar heat fluxes
114	!! - emp upward mass flux (evapo. - precip.)
115	!! - sfx salt flux due to freezing/melting (non-zero only if ice is present)
116	!! (set in limsbc(_2).F90)
117	!!----------------------------------------------------------------------
118	INTEGER, INTENT(in) :: kt ! ocean time step
119	!!
120	INTEGER :: ierror ! return error code
121	INTEGER :: ifpr ! dummy loop indice
122	INTEGER :: jfld ! dummy loop arguments
123	!!
124	CHARACTER(len=100) :: cn_dir ! Root directory for location of core files
125	TYPE(FLD_N), DIMENSION(jpfld) :: slf_i ! array of namelist informations on the fields to read
126	TYPE(FLD_N) :: sn_wndi, sn_wndj, sn_humi, sn_qsr ! informations about the fields to be read
127	TYPE(FLD_N) :: sn_qlw , sn_tair, sn_prec, sn_snow, sn_tdif ! - -
128	NAMELIST/namsbc_core/ cn_dir , ln_2m , ln_taudif, rn_pfac, &
129	& sn_wndi, sn_wndj, sn_humi , sn_qsr , &
130	& sn_qlw , sn_tair, sn_prec , sn_snow, sn_tdif
131	!!---------------------------------------------------------------------
132
133	! ! ====================== !
134	IF( kt == nit000 ) THEN ! First call kt=nit000 !
135	! ! ====================== !
136	! set file information (default values)
137	cn_dir = './' ! directory in which the model is executed
138	!
139	! (NB: frequency positive => hours, negative => months)
140	! ! file ! frequency ! variable ! time intep ! clim ! 'yearly' or ! weights ! rotation !
141	! ! name ! (hours) ! name ! (T/F) ! (T/F) ! 'monthly' ! filename ! pairs !
142	sn_wndi = FLD_N( 'uwnd10m', 24 , 'u_10' , .false. , .false. , 'yearly' , '' , '' )
143	sn_wndj = FLD_N( 'vwnd10m', 24 , 'v_10' , .false. , .false. , 'yearly' , '' , '' )
144	sn_qsr = FLD_N( 'qsw' , 24 , 'qsw' , .false. , .false. , 'yearly' , '' , '' )
145	sn_qlw = FLD_N( 'qlw' , 24 , 'qlw' , .false. , .false. , 'yearly' , '' , '' )
146	sn_tair = FLD_N( 'tair10m', 24 , 't_10' , .false. , .false. , 'yearly' , '' , '' )
147	sn_humi = FLD_N( 'humi10m', 24 , 'q_10' , .false. , .false. , 'yearly' , '' , '' )
148	sn_prec = FLD_N( 'precip' , -1 , 'precip' , .true. , .false. , 'yearly' , '' , '' )
149	sn_snow = FLD_N( 'snow' , -1 , 'snow' , .true. , .false. , 'yearly' , '' , '' )
150	sn_tdif = FLD_N( 'taudif' , 24 , 'taudif' , .true. , .false. , 'yearly' , '' , '' )
151	!
152	REWIND( numnam ) ! read in namlist namsbc_core
153	READ ( numnam, namsbc_core )
154	! ! check: do we plan to use ln_dm2dc with non-daily forcing?
155	IF( ln_dm2dc .AND. sn_qsr%nfreqh /= 24 ) &
156	& CALL ctl_stop( 'sbc_blk_core: ln_dm2dc can be activated only with daily short-wave forcing' )
157	IF( ln_dm2dc .AND. sn_qsr%ln_tint ) THEN
158	CALL ctl_warn( 'sbc_blk_core: ln_dm2dc is taking care of the temporal interpolation of daily qsr', &
159	& ' ==> We force time interpolation = .false. for qsr' )
160	sn_qsr%ln_tint = .false.
161	ENDIF
162	! ! store namelist information in an array
163	slf_i(jp_wndi) = sn_wndi ; slf_i(jp_wndj) = sn_wndj
164	slf_i(jp_qsr ) = sn_qsr ; slf_i(jp_qlw ) = sn_qlw
165	slf_i(jp_tair) = sn_tair ; slf_i(jp_humi) = sn_humi
166	slf_i(jp_prec) = sn_prec ; slf_i(jp_snow) = sn_snow
167	slf_i(jp_tdif) = sn_tdif
168	!
169	lhftau = ln_taudif ! do we use HF tau information?
170	jfld = jpfld - COUNT( (/.NOT. lhftau/) )
171	!
172	ALLOCATE( sf(jfld), STAT=ierror ) ! set sf structure
173	IF( ierror > 0 ) CALL ctl_stop( 'STOP', 'sbc_blk_core: unable to allocate sf structure' )
174	DO ifpr= 1, jfld
175	ALLOCATE( sf(ifpr)%fnow(jpi,jpj,1) )
176	IF( slf_i(ifpr)%ln_tint ) ALLOCATE( sf(ifpr)%fdta(jpi,jpj,1,2) )
177	END DO
178	! ! fill sf with slf_i and control print
179	CALL fld_fill( sf, slf_i, cn_dir, 'sbc_blk_core', 'flux formulation for ocean surface boundary condition', 'namsbc_core' )
180	!
181	sfx(:,:) = 0.0_wp ! salt flux; zero unless ice is present (computed in limsbc(_2).F90)
182	!
183	ENDIF
184
185	CALL fld_read( kt, nn_fsbc, sf ) ! input fields provided at the current time-step
186
187	! ! compute the surface ocean fluxes using CORE bulk formulea
188	IF( MOD( kt - 1, nn_fsbc ) == 0 ) CALL blk_oce_core( sf, sst_m, ssu_m, ssv_m )
189
190	#if defined key_cice
191	IF( MOD( kt - 1, nn_fsbc ) == 0 ) THEN
192	qlw_ice(:,:,1) = sf(jp_qlw)%fnow(:,:,1)
193	qsr_ice(:,:,1) = sf(jp_qsr)%fnow(:,:,1)
194	tatm_ice(:,:) = sf(jp_tair)%fnow(:,:,1)
195	qatm_ice(:,:) = sf(jp_humi)%fnow(:,:,1)
196	tprecip(:,:) = sf(jp_prec)%fnow(:,:,1) * rn_pfac
197	sprecip(:,:) = sf(jp_snow)%fnow(:,:,1) * rn_pfac
198	wndi_ice(:,:) = sf(jp_wndi)%fnow(:,:,1)
199	wndj_ice(:,:) = sf(jp_wndj)%fnow(:,:,1)
200	ENDIF
201	#endif
202	!
203	END SUBROUTINE sbc_blk_core
204
205
206	SUBROUTINE blk_oce_core( sf, pst, pu, pv )
207	!!---------------------------------------------------------------------
208	!! * ROUTINE blk_core *
209	!!
210	!! ** Purpose : provide the momentum, heat and freshwater fluxes at
211	!! the ocean surface at each time step
212	!!
213	!! ** Method : CORE bulk formulea for the ocean using atmospheric
214	!! fields read in sbc_read
215	!!
216	!! ** Outputs : - utau : i-component of the stress at U-point (N/m2)
217	!! - vtau : j-component of the stress at V-point (N/m2)
218	!! - taum : Wind stress module at T-point (N/m2)
219	!! - wndm : Wind speed module at T-point (m/s)
220	!! - qsr : Solar heat flux over the ocean (W/m2)
221	!! - qns : Non Solar heat flux over the ocean (W/m2)
222	!! - evap : Evaporation over the ocean (kg/m2/s)
223	!! - emp : evaporation minus precipitation (kg/m2/s)
224	!!
225	!! ** Nota : sf has to be a dummy argument for AGRIF on NEC
226	!!---------------------------------------------------------------------
227	TYPE(fld), INTENT(in), DIMENSION(:) :: sf ! input data
228	REAL(wp) , INTENT(in), DIMENSION(:,:) :: pst ! surface temperature [Celcius]
229	REAL(wp) , INTENT(in), DIMENSION(:,:) :: pu ! surface current at U-point (i-component) [m/s]
230	REAL(wp) , INTENT(in), DIMENSION(:,:) :: pv ! surface current at V-point (j-component) [m/s]
231	!
232	INTEGER :: ji, jj ! dummy loop indices
233	REAL(wp) :: zcoef_qsatw, zztmp ! local variable
234	REAL(wp), DIMENSION(:,:), POINTER :: zwnd_i, zwnd_j ! wind speed components at T-point
235	REAL(wp), DIMENSION(:,:), POINTER :: zqsatw ! specific humidity at pst
236	REAL(wp), DIMENSION(:,:), POINTER :: zqlw, zqsb ! long wave and sensible heat fluxes
237	REAL(wp), DIMENSION(:,:), POINTER :: zqla, zevap ! latent heat fluxes and evaporation
238	REAL(wp), DIMENSION(:,:), POINTER :: Cd ! transfer coefficient for momentum (tau)
239	REAL(wp), DIMENSION(:,:), POINTER :: Ch ! transfer coefficient for sensible heat (Q_sens)
240	REAL(wp), DIMENSION(:,:), POINTER :: Ce ! tansfert coefficient for evaporation (Q_lat)
241	REAL(wp), DIMENSION(:,:), POINTER :: zst ! surface temperature in Kelvin
242	REAL(wp), DIMENSION(:,:), POINTER :: zt_zu ! air temperature at wind speed height
243	REAL(wp), DIMENSION(:,:), POINTER :: zq_zu ! air spec. hum. at wind speed height
244	!!---------------------------------------------------------------------
245	!
246	IF( nn_timing == 1 ) CALL timing_start('blk_oce_core')
247	!
248	CALL wrk_alloc( jpi,jpj, zwnd_i, zwnd_j, zqsatw, zqlw, zqsb, zqla, zevap )
249	CALL wrk_alloc( jpi,jpj, Cd, Ch, Ce, zst, zt_zu, zq_zu )
250	!
251	! local scalars ( place there for vector optimisation purposes)
252	zcoef_qsatw = 0.98 * 640380. / rhoa
253
254	zst(:,:) = pst(:,:) + rt0 ! convert SST from Celcius to Kelvin (and set minimum value far above 0 K)
255
256	! ----------------------------------------------------------------------------- !
257	! 0 Wind components and module at T-point relative to the moving ocean !
258	! ----------------------------------------------------------------------------- !
259
260	! ... components ( U10m - U_oce ) at T-point (unmasked)
261	zwnd_i(:,:) = 0.e0
262	zwnd_j(:,:) = 0.e0
263	#if defined key_vectopt_loop
264	!CDIR COLLAPSE
265	#endif
266	DO jj = 2, jpjm1
267	DO ji = fs_2, fs_jpim1 ! vect. opt.
268	zwnd_i(ji,jj) = ( sf(jp_wndi)%fnow(ji,jj,1) - 0.5 * ( pu(ji-1,jj ) + pu(ji,jj) ) )
269	zwnd_j(ji,jj) = ( sf(jp_wndj)%fnow(ji,jj,1) - 0.5 * ( pv(ji ,jj-1) + pv(ji,jj) ) )
270	END DO
271	END DO
272	CALL lbc_lnk( zwnd_i(:,:) , 'T', -1. )
273	CALL lbc_lnk( zwnd_j(:,:) , 'T', -1. )
274	! ... scalar wind ( = \| U10m - U_oce \| ) at T-point (masked)
275	!CDIR NOVERRCHK
276	!CDIR COLLAPSE
277	wndm(:,:) = SQRT( zwnd_i(:,:) * zwnd_i(:,:) &
278	& + zwnd_j(:,:) * zwnd_j(:,:) ) * tmask(:,:,1)
279
280	! ----------------------------------------------------------------------------- !
281	! I Radiative FLUXES !
282	! ----------------------------------------------------------------------------- !
283
284	! ocean albedo assumed to be constant + modify now Qsr to include the diurnal cycle ! Short Wave
285	zztmp = 1. - albo
286	IF( ln_dm2dc ) THEN ; qsr(:,:) = zztmp * sbc_dcy( sf(jp_qsr)%fnow(:,:,1) ) * tmask(:,:,1)
287	ELSE ; qsr(:,:) = zztmp * sf(jp_qsr)%fnow(:,:,1) * tmask(:,:,1)
288	ENDIF
289	!CDIR COLLAPSE
290	zqlw(:,:) = ( sf(jp_qlw)%fnow(:,:,1) - Stef * zst(:,:)zst(:,:)zst(:,:)zst(:,:) ) tmask(:,:,1) ! Long Wave
291	! ----------------------------------------------------------------------------- !
292	! II Turbulent FLUXES !
293	! ----------------------------------------------------------------------------- !
294
295	! ... specific humidity at SST and IST
296	!CDIR NOVERRCHK
297	!CDIR COLLAPSE
298	zqsatw(:,:) = zcoef_qsatw * EXP( -5107.4 / zst(:,:) )
299
300	! ... NCAR Bulk formulae, computation of Cd, Ch, Ce at T-point :
301	IF( ln_2m ) THEN
302	!! If air temp. and spec. hum. are given at different height (2m) than wind (10m) :
303	CALL TURB_CORE_2Z(2.,10., zst , sf(jp_tair)%fnow, &
304	& zqsatw, sf(jp_humi)%fnow, wndm, &
305	& Cd , Ch , Ce , &
306	& zt_zu , zq_zu )
307	ELSE
308	!! If air temp. and spec. hum. are given at same height than wind (10m) :
309	!gm bug? at the compiling phase, add a copy in temporary arrays... ==> check perf
310	! CALL TURB_CORE_1Z( 10., zst (:,:), sf(jp_tair)%fnow(:,:), &
311	! & zqsatw(:,:), sf(jp_humi)%fnow(:,:), wndm(:,:), &
312	! & Cd (:,:), Ch (:,:), Ce (:,:) )
313	!gm bug
314	! ARPDBG - this won't compile with gfortran. Fix but check performance
315	! as per comment above.
316	CALL TURB_CORE_1Z( 10., zst , sf(jp_tair)%fnow(:,:,1), &
317	& zqsatw, sf(jp_humi)%fnow(:,:,1), wndm, &
318	& Cd , Ch , Ce )
319	ENDIF
320
321	! ... tau module, i and j component
322	DO jj = 1, jpj
323	DO ji = 1, jpi
324	zztmp = rhoa * wndm(ji,jj) * Cd(ji,jj)
325	taum (ji,jj) = zztmp * wndm (ji,jj)
326	zwnd_i(ji,jj) = zztmp * zwnd_i(ji,jj)
327	zwnd_j(ji,jj) = zztmp * zwnd_j(ji,jj)
328	END DO
329	END DO
330
331	! ... add the HF tau contribution to the wind stress module?
332	IF( lhftau ) THEN
333	!CDIR COLLAPSE
334	taum(:,:) = taum(:,:) + sf(jp_tdif)%fnow(:,:,1)
335	ENDIF
336	CALL iom_put( "taum_oce", taum ) ! output wind stress module
337
338	! ... utau, vtau at U- and V_points, resp.
339	! Note the use of 0.5*(2-umask) in order to unmask the stress along coastlines
340	DO jj = 1, jpjm1
341	DO ji = 1, fs_jpim1
342	utau(ji,jj) = 0.5 * ( 2. - umask(ji,jj,1) ) * ( zwnd_i(ji,jj) + zwnd_i(ji+1,jj ) )
343	vtau(ji,jj) = 0.5 * ( 2. - vmask(ji,jj,1) ) * ( zwnd_j(ji,jj) + zwnd_j(ji ,jj+1) )
344	END DO
345	END DO
346	CALL lbc_lnk( utau(:,:), 'U', -1. )
347	CALL lbc_lnk( vtau(:,:), 'V', -1. )
348
349	! Turbulent fluxes over ocean
350	! -----------------------------
351	IF( ln_2m ) THEN
352	! Values of temp. and hum. adjusted to 10m must be used instead of 2m values
353	zevap(:,:) = MAX( 0.e0, rhoa Ce(:,:)( zqsatw(:,:) - zq_zu(:,:) ) * wndm(:,:) ) ! Evaporation
354	zqsb (:,:) = rhoacpaCh(:,:)( zst (:,:) - zt_zu(:,:) ) wndm(:,:) ! Sensible Heat
355	ELSE
356	!CDIR COLLAPSE
357	zevap(:,:) = MAX( 0.e0, rhoa Ce(:,:)( zqsatw(:,:) - sf(jp_humi)%fnow(:,:,1) ) * wndm(:,:) ) ! Evaporation
358	!CDIR COLLAPSE
359	zqsb (:,:) = rhoacpaCh(:,:)( zst (:,:) - sf(jp_tair)%fnow(:,:,1) ) wndm(:,:) ! Sensible Heat
360	ENDIF
361	!CDIR COLLAPSE
362	zqla (:,:) = Lv * zevap(:,:) ! Latent Heat
363
364	IF(ln_ctl) THEN
365	CALL prt_ctl( tab2d_1=zqla , clinfo1=' blk_oce_core: zqla : ', tab2d_2=Ce , clinfo2=' Ce : ' )
366	CALL prt_ctl( tab2d_1=zqsb , clinfo1=' blk_oce_core: zqsb : ', tab2d_2=Ch , clinfo2=' Ch : ' )
367	CALL prt_ctl( tab2d_1=zqlw , clinfo1=' blk_oce_core: zqlw : ', tab2d_2=qsr, clinfo2=' qsr : ' )
368	CALL prt_ctl( tab2d_1=zqsatw, clinfo1=' blk_oce_core: zqsatw : ', tab2d_2=zst, clinfo2=' zst : ' )
369	CALL prt_ctl( tab2d_1=utau , clinfo1=' blk_oce_core: utau : ', mask1=umask, &
370	& tab2d_2=vtau , clinfo2= ' vtau : ' , mask2=vmask )
371	CALL prt_ctl( tab2d_1=wndm , clinfo1=' blk_oce_core: wndm : ')
372	CALL prt_ctl( tab2d_1=zst , clinfo1=' blk_oce_core: zst : ')
373	ENDIF
374
375	! ----------------------------------------------------------------------------- !
376	! III Total FLUXES !
377	! ----------------------------------------------------------------------------- !
378
379	!CDIR COLLAPSE
380	emp (:,:) = ( zevap(:,:) & ! mass flux (evap. - precip.)
381	& - sf(jp_prec)%fnow(:,:,1) * rn_pfac ) * tmask(:,:,1)
382	!CDIR COLLAPSE
383	qns(:,:) = zqlw(:,:) - zqsb(:,:) - zqla(:,:) & ! Downward Non Solar flux
384	& - sf(jp_snow)%fnow(:,:,1) * lfus & ! remove latent melting heat for solid precip
385	& - zevap(:,:) * pst(:,:) * rcp & ! remove evap heat content at SST
386	& + ( sf(jp_prec)%fnow(:,:,1) - sf(jp_snow)%fnow(:,:,1) ) & ! add liquid precip heat content at Tair
387	& * ( sf(jp_tair)%fnow(:,:,1) - rt0 ) * rcp &
388	& + sf(jp_snow)%fnow(:,:,1) & ! add solid precip heat content at min(Tair,Tsnow)
389	& * ( MIN( sf(jp_tair)%fnow(:,:,1), rt0_snow ) - rt0 ) * cpic
390	!
391	CALL iom_put( "qlw_oce", zqlw ) ! output downward longwave heat over the ocean
392	CALL iom_put( "qsb_oce", - zqsb ) ! output downward sensible heat over the ocean
393	CALL iom_put( "qla_oce", - zqla ) ! output downward latent heat over the ocean
394	CALL iom_put( "qns_oce", qns ) ! output downward non solar heat over the ocean
395	!
396	IF(ln_ctl) THEN
397	CALL prt_ctl(tab2d_1=zqsb , clinfo1=' blk_oce_core: zqsb : ', tab2d_2=zqlw , clinfo2=' zqlw : ')
398	CALL prt_ctl(tab2d_1=zqla , clinfo1=' blk_oce_core: zqla : ', tab2d_2=qsr , clinfo2=' qsr : ')
399	CALL prt_ctl(tab2d_1=pst , clinfo1=' blk_oce_core: pst : ', tab2d_2=emp , clinfo2=' emp : ')
400	CALL prt_ctl(tab2d_1=utau , clinfo1=' blk_oce_core: utau : ', mask1=umask, &
401	& tab2d_2=vtau , clinfo2= ' vtau : ' , mask2=vmask )
402	ENDIF
403	!
404	CALL wrk_dealloc( jpi,jpj, zwnd_i, zwnd_j, zqsatw, zqlw, zqsb, zqla, zevap )
405	CALL wrk_dealloc( jpi,jpj, Cd, Ch, Ce, zst, zt_zu, zq_zu )
406	!
407	IF( nn_timing == 1 ) CALL timing_stop('blk_oce_core')
408	!
409	END SUBROUTINE blk_oce_core
410
411
412	SUBROUTINE blk_ice_core( pst , pui , pvi , palb , &
413	& p_taui, p_tauj, p_qns , p_qsr, &
414	& p_qla , p_dqns, p_dqla, &
415	& p_tpr , p_spr , &
416	& p_fr1 , p_fr2 , cd_grid, pdim )
417	!!---------------------------------------------------------------------
418	!! * ROUTINE blk_ice_core *
419	!!
420	!! ** Purpose : provide the surface boundary condition over sea-ice
421	!!
422	!! ** Method : compute momentum, heat and freshwater exchanged
423	!! between atmosphere and sea-ice using CORE bulk
424	!! formulea, ice variables and read atmmospheric fields.
425	!! NB: ice drag coefficient is assumed to be a constant
426	!!
427	!! caution : the net upward water flux has with mm/day unit
428	!!---------------------------------------------------------------------
429	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: pst ! ice surface temperature (>0, =rt0 over land) [Kelvin]
430	REAL(wp), DIMENSION(:,:) , INTENT(in ) :: pui ! ice surface velocity (i- and i- components [m/s]
431	REAL(wp), DIMENSION(:,:) , INTENT(in ) :: pvi ! at I-point (B-grid) or U & V-point (C-grid)
432	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: palb ! ice albedo (clear sky) (alb_ice_cs) [%]
433	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_taui ! i- & j-components of surface ice stress [N/m2]
434	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_tauj ! at I-point (B-grid) or U & V-point (C-grid)
435	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qns ! non solar heat flux over ice (T-point) [W/m2]
436	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qsr ! solar heat flux over ice (T-point) [W/m2]
437	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qla ! latent heat flux over ice (T-point) [W/m2]
438	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_dqns ! non solar heat sensistivity (T-point) [W/m2]
439	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_dqla ! latent heat sensistivity (T-point) [W/m2]
440	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_tpr ! total precipitation (T-point) [Kg/m2/s]
441	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_spr ! solid precipitation (T-point) [Kg/m2/s]
442	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_fr1 ! 1sr fraction of qsr penetration in ice (T-point) [%]
443	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_fr2 ! 2nd fraction of qsr penetration in ice (T-point) [%]
444	CHARACTER(len=1) , INTENT(in ) :: cd_grid ! ice grid ( C or B-grid)
445	INTEGER , INTENT(in ) :: pdim ! number of ice categories
446	!!
447	INTEGER :: ji, jj, jl ! dummy loop indices
448	INTEGER :: ijpl ! number of ice categories (size of 3rd dim of input arrays)
449	REAL(wp) :: zst2, zst3
450	REAL(wp) :: zcoef_wnorm, zcoef_wnorm2, zcoef_dqlw, zcoef_dqla, zcoef_dqsb
451	REAL(wp) :: zztmp ! temporary variable
452	REAL(wp) :: zcoef_frca ! fractional cloud amount
453	REAL(wp) :: zwnorm_f, zwndi_f , zwndj_f ! relative wind module and components at F-point
454	REAL(wp) :: zwndi_t , zwndj_t ! relative wind components at T-point
455	!!
456	REAL(wp), DIMENSION(:,:) , POINTER :: z_wnds_t ! wind speed ( = \| U10m - U_ice \| ) at T-point
457	REAL(wp), DIMENSION(:,:,:), POINTER :: z_qlw ! long wave heat flux over ice
458	REAL(wp), DIMENSION(:,:,:), POINTER :: z_qsb ! sensible heat flux over ice
459	REAL(wp), DIMENSION(:,:,:), POINTER :: z_dqlw ! long wave heat sensitivity over ice
460	REAL(wp), DIMENSION(:,:,:), POINTER :: z_dqsb ! sensible heat sensitivity over ice
461	!!---------------------------------------------------------------------
462	!
463	IF( nn_timing == 1 ) CALL timing_start('blk_ice_core')
464	!
465	CALL wrk_alloc( jpi,jpj, z_wnds_t )
466	CALL wrk_alloc( jpi,jpj,pdim, z_qlw, z_qsb, z_dqlw, z_dqsb )
467
468	ijpl = pdim ! number of ice categories
469
470	! local scalars ( place there for vector optimisation purposes)
471	zcoef_wnorm = rhoa * Cice
472	zcoef_wnorm2 = rhoa * Cice * 0.5
473	zcoef_dqlw = 4.0 * 0.95 * Stef
474	zcoef_dqla = -Ls * Cice * 11637800. * (-5897.8)
475	zcoef_dqsb = rhoa * cpa * Cice
476	zcoef_frca = 1.0 - 0.3
477
478	!!gm brutal....
479	z_wnds_t(:,:) = 0.e0
480	p_taui (:,:) = 0.e0
481	p_tauj (:,:) = 0.e0
482	!!gm end
483
484	#if defined key_lim3
485	tatm_ice(:,:) = sf(jp_tair)%fnow(:,:,1) ! LIM3: make Tair available in sea-ice. WARNING allocated after call to ice_init
486	#endif
487	! ----------------------------------------------------------------------------- !
488	! Wind components and module relative to the moving ocean ( U10m - U_ice ) !
489	! ----------------------------------------------------------------------------- !
490	SELECT CASE( cd_grid )
491	CASE( 'I' ) ! B-grid ice dynamics : I-point (i.e. F-point with sea-ice indexation)
492	! and scalar wind at T-point ( = \| U10m - U_ice \| ) (masked)
493	!CDIR NOVERRCHK
494	DO jj = 2, jpjm1
495	DO ji = 2, jpim1 ! B grid : NO vector opt
496	! ... scalar wind at I-point (fld being at T-point)
497	zwndi_f = 0.25 * ( sf(jp_wndi)%fnow(ji-1,jj ,1) + sf(jp_wndi)%fnow(ji ,jj ,1) &
498	& + sf(jp_wndi)%fnow(ji-1,jj-1,1) + sf(jp_wndi)%fnow(ji ,jj-1,1) ) - pui(ji,jj)
499	zwndj_f = 0.25 * ( sf(jp_wndj)%fnow(ji-1,jj ,1) + sf(jp_wndj)%fnow(ji ,jj ,1) &
500	& + sf(jp_wndj)%fnow(ji-1,jj-1,1) + sf(jp_wndj)%fnow(ji ,jj-1,1) ) - pvi(ji,jj)
501	zwnorm_f = zcoef_wnorm * SQRT( zwndi_f * zwndi_f + zwndj_f * zwndj_f )
502	! ... ice stress at I-point
503	p_taui(ji,jj) = zwnorm_f * zwndi_f
504	p_tauj(ji,jj) = zwnorm_f * zwndj_f
505	! ... scalar wind at T-point (fld being at T-point)
506	zwndi_t = sf(jp_wndi)%fnow(ji,jj,1) - 0.25 * ( pui(ji,jj+1) + pui(ji+1,jj+1) &
507	& + pui(ji,jj ) + pui(ji+1,jj ) )
508	zwndj_t = sf(jp_wndj)%fnow(ji,jj,1) - 0.25 * ( pvi(ji,jj+1) + pvi(ji+1,jj+1) &
509	& + pvi(ji,jj ) + pvi(ji+1,jj ) )
510	z_wnds_t(ji,jj) = SQRT( zwndi_t * zwndi_t + zwndj_t * zwndj_t ) * tmask(ji,jj,1)
511	END DO
512	END DO
513	CALL lbc_lnk( p_taui , 'I', -1. )
514	CALL lbc_lnk( p_tauj , 'I', -1. )
515	CALL lbc_lnk( z_wnds_t, 'T', 1. )
516	!
517	CASE( 'C' ) ! C-grid ice dynamics : U & V-points (same as ocean)
518	#if defined key_vectopt_loop
519	!CDIR COLLAPSE
520	#endif
521	DO jj = 2, jpj
522	DO ji = fs_2, jpi ! vect. opt.
523	zwndi_t = ( sf(jp_wndi)%fnow(ji,jj,1) - 0.5 * ( pui(ji-1,jj ) + pui(ji,jj) ) )
524	zwndj_t = ( sf(jp_wndj)%fnow(ji,jj,1) - 0.5 * ( pvi(ji ,jj-1) + pvi(ji,jj) ) )
525	z_wnds_t(ji,jj) = SQRT( zwndi_t * zwndi_t + zwndj_t * zwndj_t ) * tmask(ji,jj,1)
526	END DO
527	END DO
528	#if defined key_vectopt_loop
529	!CDIR COLLAPSE
530	#endif
531	DO jj = 2, jpjm1
532	DO ji = fs_2, fs_jpim1 ! vect. opt.
533	p_taui(ji,jj) = zcoef_wnorm2 * ( z_wnds_t(ji+1,jj ) + z_wnds_t(ji,jj) ) &
534	& * ( 0.5 * (sf(jp_wndi)%fnow(ji+1,jj,1) + sf(jp_wndi)%fnow(ji,jj,1) ) - pui(ji,jj) )
535	p_tauj(ji,jj) = zcoef_wnorm2 * ( z_wnds_t(ji,jj+1 ) + z_wnds_t(ji,jj) ) &
536	& * ( 0.5 * (sf(jp_wndj)%fnow(ji,jj+1,1) + sf(jp_wndj)%fnow(ji,jj,1) ) - pvi(ji,jj) )
537	END DO
538	END DO
539	CALL lbc_lnk( p_taui , 'U', -1. )
540	CALL lbc_lnk( p_tauj , 'V', -1. )
541	CALL lbc_lnk( z_wnds_t, 'T', 1. )
542	!
543	END SELECT
544
545	zztmp = 1. / ( 1. - albo )
546	! ! ========================== !
547	DO jl = 1, ijpl ! Loop over ice categories !
548	! ! ========================== !
549	!CDIR NOVERRCHK
550	!CDIR COLLAPSE
551	DO jj = 1 , jpj
552	!CDIR NOVERRCHK
553	DO ji = 1, jpi
554	! ----------------------------!
555	! I Radiative FLUXES !
556	! ----------------------------!
557	zst2 = pst(ji,jj,jl) * pst(ji,jj,jl)
558	zst3 = pst(ji,jj,jl) * zst2
559	! Short Wave (sw)
560	p_qsr(ji,jj,jl) = zztmp * ( 1. - palb(ji,jj,jl) ) * qsr(ji,jj)
561	! Long Wave (lw)
562	z_qlw(ji,jj,jl) = 0.95 * ( sf(jp_qlw)%fnow(ji,jj,1) - Stef * pst(ji,jj,jl) * zst3 ) * tmask(ji,jj,1)
563	! lw sensitivity
564	z_dqlw(ji,jj,jl) = zcoef_dqlw * zst3
565
566	! ----------------------------!
567	! II Turbulent FLUXES !
568	! ----------------------------!
569
570	! ... turbulent heat fluxes
571	! Sensible Heat
572	z_qsb(ji,jj,jl) = rhoa * cpa * Cice * z_wnds_t(ji,jj) * ( pst(ji,jj,jl) - sf(jp_tair)%fnow(ji,jj,1) )
573	! Latent Heat
574	p_qla(ji,jj,jl) = MAX( 0.e0, rhoa * Ls * Cice * z_wnds_t(ji,jj) &
575	& * ( 11637800. * EXP( -5897.8 / pst(ji,jj,jl) ) / rhoa - sf(jp_humi)%fnow(ji,jj,1) ) )
576	! Latent heat sensitivity for ice (Dqla/Dt)
577	p_dqla(ji,jj,jl) = zcoef_dqla * z_wnds_t(ji,jj) / ( zst2 ) * EXP( -5897.8 / pst(ji,jj,jl) )
578	! Sensible heat sensitivity (Dqsb_ice/Dtn_ice)
579	z_dqsb(ji,jj,jl) = zcoef_dqsb * z_wnds_t(ji,jj)
580
581	! ----------------------------!
582	! III Total FLUXES !
583	! ----------------------------!
584	! Downward Non Solar flux
585	p_qns (ji,jj,jl) = z_qlw (ji,jj,jl) - z_qsb (ji,jj,jl) - p_qla (ji,jj,jl)
586	! Total non solar heat flux sensitivity for ice
587	p_dqns(ji,jj,jl) = - ( z_dqlw(ji,jj,jl) + z_dqsb(ji,jj,jl) + p_dqla(ji,jj,jl) )
588	END DO
589	!
590	END DO
591	!
592	END DO
593	!
594	!--------------------------------------------------------------------
595	! FRACTIONs of net shortwave radiation which is not absorbed in the
596	! thin surface layer and penetrates inside the ice cover
597	! ( Maykut and Untersteiner, 1971 ; Ebert and Curry, 1993 )
598
599	!CDIR COLLAPSE
600	p_fr1(:,:) = ( 0.18 * ( 1.0 - zcoef_frca ) + 0.35 * zcoef_frca )
601	!CDIR COLLAPSE
602	p_fr2(:,:) = ( 0.82 * ( 1.0 - zcoef_frca ) + 0.65 * zcoef_frca )
603
604	!CDIR COLLAPSE
605	p_tpr(:,:) = sf(jp_prec)%fnow(:,:,1) * rn_pfac ! total precipitation [kg/m2/s]
606	!CDIR COLLAPSE
607	p_spr(:,:) = sf(jp_snow)%fnow(:,:,1) * rn_pfac ! solid precipitation [kg/m2/s]
608	CALL iom_put( 'snowpre', p_spr ) ! Snow precipitation
609	!
610	IF(ln_ctl) THEN
611	CALL prt_ctl(tab3d_1=p_qla , clinfo1=' blk_ice_core: p_qla : ', tab3d_2=z_qsb , clinfo2=' z_qsb : ', kdim=ijpl)
612	CALL prt_ctl(tab3d_1=z_qlw , clinfo1=' blk_ice_core: z_qlw : ', tab3d_2=p_dqla , clinfo2=' p_dqla : ', kdim=ijpl)
613	CALL prt_ctl(tab3d_1=z_dqsb , clinfo1=' blk_ice_core: z_dqsb : ', tab3d_2=z_dqlw , clinfo2=' z_dqlw : ', kdim=ijpl)
614	CALL prt_ctl(tab3d_1=p_dqns , clinfo1=' blk_ice_core: p_dqns : ', tab3d_2=p_qsr , clinfo2=' p_qsr : ', kdim=ijpl)
615	CALL prt_ctl(tab3d_1=pst , clinfo1=' blk_ice_core: pst : ', tab3d_2=p_qns , clinfo2=' p_qns : ', kdim=ijpl)
616	CALL prt_ctl(tab2d_1=p_tpr , clinfo1=' blk_ice_core: p_tpr : ', tab2d_2=p_spr , clinfo2=' p_spr : ')
617	CALL prt_ctl(tab2d_1=p_taui , clinfo1=' blk_ice_core: p_taui : ', tab2d_2=p_tauj , clinfo2=' p_tauj : ')
618	CALL prt_ctl(tab2d_1=z_wnds_t, clinfo1=' blk_ice_core: z_wnds_t : ')
619	ENDIF
620
621	CALL wrk_dealloc( jpi,jpj, z_wnds_t )
622	CALL wrk_dealloc( jpi,jpj,pdim, z_qlw, z_qsb, z_dqlw, z_dqsb )
623	!
624	IF( nn_timing == 1 ) CALL timing_stop('blk_ice_core')
625	!
626	END SUBROUTINE blk_ice_core
627
628
629	SUBROUTINE TURB_CORE_1Z(zu, sst, T_a, q_sat, q_a, &
630	& dU , Cd , Ch , Ce )
631	!!----------------------------------------------------------------------
632	!! * ROUTINE turb_core *
633	!!
634	!! ** Purpose : Computes turbulent transfert coefficients of surface
635	!! fluxes according to Large & Yeager (2004)
636	!!
637	!! ** Method : I N E R T I A L D I S S I P A T I O N M E T H O D
638	!! Momentum, Latent and sensible heat exchange coefficients
639	!! Caution: this procedure should only be used in cases when air
640	!! temperature (T_air), air specific humidity (q_air) and wind (dU)
641	!! are provided at the same height 'zzu'!
642	!!
643	!! References : Large & Yeager, 2004 : ???
644	!!----------------------------------------------------------------------
645	REAL(wp) , INTENT(in ) :: zu ! altitude of wind measurement [m]
646	REAL(wp), DIMENSION(:,:), INTENT(in ) :: sst ! sea surface temperature [Kelvin]
647	REAL(wp), DIMENSION(:,:), INTENT(in ) :: T_a ! potential air temperature [Kelvin]
648	REAL(wp), DIMENSION(:,:), INTENT(in ) :: q_sat ! sea surface specific humidity [kg/kg]
649	REAL(wp), DIMENSION(:,:), INTENT(in ) :: q_a ! specific air humidity [kg/kg]
650	REAL(wp), DIMENSION(:,:), INTENT(in ) :: dU ! wind module \|U(zu)-U(0)\| [m/s]
651	REAL(wp), DIMENSION(:,:), INTENT( out) :: Cd ! transfert coefficient for momentum (tau)
652	REAL(wp), DIMENSION(:,:), INTENT( out) :: Ch ! transfert coefficient for temperature (Q_sens)
653	REAL(wp), DIMENSION(:,:), INTENT( out) :: Ce ! transfert coefficient for evaporation (Q_lat)
654	!!
655	INTEGER :: j_itt
656	INTEGER , PARAMETER :: nb_itt = 3
657	REAL(wp), PARAMETER :: grav = 9.8 ! gravity
658	REAL(wp), PARAMETER :: kappa = 0.4 ! von Karman s constant
659
660	REAL(wp), DIMENSION(:,:), POINTER :: dU10 ! dU [m/s]
661	REAL(wp), DIMENSION(:,:), POINTER :: dT ! air/sea temperature differeence [K]
662	REAL(wp), DIMENSION(:,:), POINTER :: dq ! air/sea humidity difference [K]
663	REAL(wp), DIMENSION(:,:), POINTER :: Cd_n10 ! 10m neutral drag coefficient
664	REAL(wp), DIMENSION(:,:), POINTER :: Ce_n10 ! 10m neutral latent coefficient
665	REAL(wp), DIMENSION(:,:), POINTER :: Ch_n10 ! 10m neutral sensible coefficient
666	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd_n10 ! root square of Cd_n10
667	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd ! root square of Cd
668	REAL(wp), DIMENSION(:,:), POINTER :: T_vpot ! virtual potential temperature [K]
669	REAL(wp), DIMENSION(:,:), POINTER :: T_star ! turbulent scale of tem. fluct.
670	REAL(wp), DIMENSION(:,:), POINTER :: q_star ! turbulent humidity of temp. fluct.
671	REAL(wp), DIMENSION(:,:), POINTER :: U_star ! turb. scale of velocity fluct.
672	REAL(wp), DIMENSION(:,:), POINTER :: L ! Monin-Obukov length [m]
673	REAL(wp), DIMENSION(:,:), POINTER :: zeta ! stability parameter at height zu
674	REAL(wp), DIMENSION(:,:), POINTER :: U_n10 ! neutral wind velocity at 10m [m]
675	REAL(wp), DIMENSION(:,:), POINTER :: xlogt, xct, zpsi_h, zpsi_m
676
677	INTEGER , DIMENSION(:,:), POINTER :: stab ! 1st guess stability test integer
678	!!----------------------------------------------------------------------
679	!
680	IF( nn_timing == 1 ) CALL timing_start('TURB_CORE_1Z')
681	!
682	CALL wrk_alloc( jpi,jpj, stab ) ! integer
683	CALL wrk_alloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
684	CALL wrk_alloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta, U_n10, xlogt, xct, zpsi_h, zpsi_m )
685
686	!! * Start
687	!! Air/sea differences
688	dU10 = max(0.5, dU) ! we don't want to fall under 0.5 m/s
689	dT = T_a - sst ! assuming that T_a is allready the potential temp. at zzu
690	dq = q_a - q_sat
691	!!
692	!! Virtual potential temperature
693	T_vpot = T_a(1. + 0.608q_a)
694	!!
695	!! Neutral Drag Coefficient
696	stab = 0.5 + sign(0.5,dT) ! stable : stab = 1 ; unstable : stab = 0
697	IF ( ln_cdgw ) THEN
698	cdn_wave = cdn_wave - rsmall*(tmask(:,:,1)-1)
699	Cd_n10(:,:) = cdn_wave
700	ELSE
701	Cd_n10 = 1E-3 * ( 2.7/dU10 + 0.142 + dU10/13.09 ) ! L & Y eq. (6a)
702	ENDIF
703	sqrt_Cd_n10 = sqrt(Cd_n10)
704	Ce_n10 = 1E-3 * ( 34.6 * sqrt_Cd_n10 ) ! L & Y eq. (6b)
705	Ch_n10 = 1E-3sqrt_Cd_n10(18stab + 32.7(1-stab)) ! L & Y eq. (6c), (6d)
706	!!
707	!! Initializing transfert coefficients with their first guess neutral equivalents :
708	Cd = Cd_n10 ; Ce = Ce_n10 ; Ch = Ch_n10 ; sqrt_Cd = sqrt(Cd)
709
710	!! * Now starting iteration loop
711	DO j_itt=1, nb_itt
712	!! Turbulent scales :
713	U_star = sqrt_Cd*dU10 ! L & Y eq. (7a)
714	T_star = Ch/sqrt_Cd*dT ! L & Y eq. (7b)
715	q_star = Ce/sqrt_Cd*dq ! L & Y eq. (7c)
716
717	!! Estimate the Monin-Obukov length :
718	L = (U_star*2)/( kappagrav*(T_star/T_vpot + q_star/(q_a + 1./0.608)) )
719
720	!! Stability parameters :
721	zeta = zu/L ; zeta = sign( min(abs(zeta),10.0), zeta )
722	zpsi_h = psi_h(zeta)
723	zpsi_m = psi_m(zeta)
724
725	IF ( ln_cdgw ) THEN
726	sqrt_Cd=kappa/((kappa/sqrt_Cd_n10) - zpsi_m) ; Cd=sqrt_Cd*sqrt_Cd;
727	ELSE
728	!! Shifting the wind speed to 10m and neutral stability :
729	U_n10 = dU101./(1. + sqrt_Cd_n10/kappa(log(zu/10.) - zpsi_m)) ! L & Y eq. (9a)
730
731	!! Updating the neutral 10m transfer coefficients :
732	Cd_n10 = 1E-3 * (2.7/U_n10 + 0.142 + U_n10/13.09) ! L & Y eq. (6a)
733	sqrt_Cd_n10 = sqrt(Cd_n10)
734	Ce_n10 = 1E-3 * (34.6 * sqrt_Cd_n10) ! L & Y eq. (6b)
735	stab = 0.5 + sign(0.5,zeta)
736	Ch_n10 = 1E-3sqrt_Cd_n10(18.stab + 32.7(1-stab)) ! L & Y eq. (6c), (6d)
737
738	!! Shifting the neutral 10m transfer coefficients to ( zu , zeta ) :
739	!!
740	xct = 1. + sqrt_Cd_n10/kappa*(log(zu/10) - zpsi_m)
741	Cd = Cd_n10/(xct*xct) ; sqrt_Cd = sqrt(Cd)
742	ENDIF
743	!!
744	xlogt = log(zu/10.) - zpsi_h
745	!!
746	xct = 1. + Ch_n10*xlogt/kappa/sqrt_Cd_n10
747	Ch = Ch_n10*sqrt_Cd/sqrt_Cd_n10/xct
748	!!
749	xct = 1. + Ce_n10*xlogt/kappa/sqrt_Cd_n10
750	Ce = Ce_n10*sqrt_Cd/sqrt_Cd_n10/xct
751	!!
752	END DO
753	!!
754	CALL wrk_dealloc( jpi,jpj, stab ) ! integer
755	CALL wrk_dealloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
756	CALL wrk_dealloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta, U_n10, xlogt, xct, zpsi_h, zpsi_m )
757	!
758	IF( nn_timing == 1 ) CALL timing_stop('TURB_CORE_1Z')
759	!
760	END SUBROUTINE TURB_CORE_1Z
761
762
763	SUBROUTINE TURB_CORE_2Z(zt, zu, sst, T_zt, q_sat, q_zt, dU, Cd, Ch, Ce, T_zu, q_zu)
764	!!----------------------------------------------------------------------
765	!! * ROUTINE turb_core *
766	!!
767	!! ** Purpose : Computes turbulent transfert coefficients of surface
768	!! fluxes according to Large & Yeager (2004).
769	!!
770	!! ** Method : I N E R T I A L D I S S I P A T I O N M E T H O D
771	!! Momentum, Latent and sensible heat exchange coefficients
772	!! Caution: this procedure should only be used in cases when air
773	!! temperature (T_air) and air specific humidity (q_air) are at 2m
774	!! whereas wind (dU) is at 10m.
775	!!
776	!! References : Large & Yeager, 2004 : ???
777	!!----------------------------------------------------------------------
778	REAL(wp), INTENT(in ) :: zt ! height for T_zt and q_zt [m]
779	REAL(wp), INTENT(in ) :: zu ! height for dU [m]
780	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: sst ! sea surface temperature [Kelvin]
781	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: T_zt ! potential air temperature [Kelvin]
782	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: q_sat ! sea surface specific humidity [kg/kg]
783	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: q_zt ! specific air humidity [kg/kg]
784	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: dU ! relative wind module \|U(zu)-U(0)\| [m/s]
785	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: Cd ! transfer coefficient for momentum (tau)
786	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: Ch ! transfer coefficient for sensible heat (Q_sens)
787	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: Ce ! transfert coefficient for evaporation (Q_lat)
788	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: T_zu ! air temp. shifted at zu [K]
789	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: q_zu ! spec. hum. shifted at zu [kg/kg]
790
791	INTEGER :: j_itt
792	INTEGER , PARAMETER :: nb_itt = 3 ! number of itterations
793	REAL(wp), PARAMETER :: grav = 9.8 ! gravity
794	REAL(wp), PARAMETER :: kappa = 0.4 ! von Karman's constant
795
796	REAL(wp), DIMENSION(:,:), POINTER :: dU10 ! dU [m/s]
797	REAL(wp), DIMENSION(:,:), POINTER :: dT ! air/sea temperature differeence [K]
798	REAL(wp), DIMENSION(:,:), POINTER :: dq ! air/sea humidity difference [K]
799	REAL(wp), DIMENSION(:,:), POINTER :: Cd_n10 ! 10m neutral drag coefficient
800	REAL(wp), DIMENSION(:,:), POINTER :: Ce_n10 ! 10m neutral latent coefficient
801	REAL(wp), DIMENSION(:,:), POINTER :: Ch_n10 ! 10m neutral sensible coefficient
802	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd_n10 ! root square of Cd_n10
803	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd ! root square of Cd
804	REAL(wp), DIMENSION(:,:), POINTER :: T_vpot ! virtual potential temperature [K]
805	REAL(wp), DIMENSION(:,:), POINTER :: T_star ! turbulent scale of tem. fluct.
806	REAL(wp), DIMENSION(:,:), POINTER :: q_star ! turbulent humidity of temp. fluct.
807	REAL(wp), DIMENSION(:,:), POINTER :: U_star ! turb. scale of velocity fluct.
808	REAL(wp), DIMENSION(:,:), POINTER :: L ! Monin-Obukov length [m]
809	REAL(wp), DIMENSION(:,:), POINTER :: zeta_u ! stability parameter at height zu
810	REAL(wp), DIMENSION(:,:), POINTER :: zeta_t ! stability parameter at height zt
811	REAL(wp), DIMENSION(:,:), POINTER :: U_n10 ! neutral wind velocity at 10m [m]
812	REAL(wp), DIMENSION(:,:), POINTER :: xlogt, xct, zpsi_hu, zpsi_ht, zpsi_m
813
814	INTEGER , DIMENSION(:,:), POINTER :: stab ! 1st stability test integer
815	!!----------------------------------------------------------------------
816	!
817	IF( nn_timing == 1 ) CALL timing_start('TURB_CORE_2Z')
818	!
819	CALL wrk_alloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
820	CALL wrk_alloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta_u, zeta_t, U_n10 )
821	CALL wrk_alloc( jpi,jpj, xlogt, xct, zpsi_hu, zpsi_ht, zpsi_m )
822	CALL wrk_alloc( jpi,jpj, stab ) ! interger
823
824	!! Initial air/sea differences
825	dU10 = max(0.5, dU) ! we don't want to fall under 0.5 m/s
826	dT = T_zt - sst
827	dq = q_zt - q_sat
828
829	!! Neutral Drag Coefficient :
830	stab = 0.5 + sign(0.5,dT) ! stab = 1 if dT > 0 -> STABLE
831	IF( ln_cdgw ) THEN
832	cdn_wave = cdn_wave - rsmall*(tmask(:,:,1)-1)
833	Cd_n10(:,:) = cdn_wave
834	ELSE
835	Cd_n10 = 1E-3*( 2.7/dU10 + 0.142 + dU10/13.09 )
836	ENDIF
837	sqrt_Cd_n10 = sqrt(Cd_n10)
838	Ce_n10 = 1E-3( 34.6 sqrt_Cd_n10 )
839	Ch_n10 = 1E-3sqrt_Cd_n10(18stab + 32.7(1 - stab))
840
841	!! Initializing transf. coeff. with their first guess neutral equivalents :
842	Cd = Cd_n10 ; Ce = Ce_n10 ; Ch = Ch_n10 ; sqrt_Cd = sqrt(Cd)
843
844	!! Initializing z_u values with z_t values :
845	T_zu = T_zt ; q_zu = q_zt
846
847	!! * Now starting iteration loop
848	DO j_itt=1, nb_itt
849	dT = T_zu - sst ; dq = q_zu - q_sat ! Updating air/sea differences
850	T_vpot = T_zu(1. + 0.608q_zu) ! Updating virtual potential temperature at zu
851	U_star = sqrt_Cd*dU10 ! Updating turbulent scales : (L & Y eq. (7))
852	T_star = Ch/sqrt_Cd*dT !
853	q_star = Ce/sqrt_Cd*dq !
854	!!
855	L = (U_star*U_star) & ! Estimate the Monin-Obukov length at height zu
856	& / (kappagrav/T_vpot(T_star(1.+0.608q_zu) + 0.608T_zuq_star))
857	!! Stability parameters :
858	zeta_u = zu/L ; zeta_u = sign( min(abs(zeta_u),10.0), zeta_u )
859	zeta_t = zt/L ; zeta_t = sign( min(abs(zeta_t),10.0), zeta_t )
860	zpsi_hu = psi_h(zeta_u)
861	zpsi_ht = psi_h(zeta_t)
862	zpsi_m = psi_m(zeta_u)
863	!!
864	!! Shifting the wind speed to 10m and neutral stability : (L & Y eq.(9a))
865	! U_n10 = dU10/(1. + sqrt_Cd_n10/kappa*(log(zu/10.) - psi_m(zeta_u)))
866	U_n10 = dU10/(1. + sqrt_Cd_n10/kappa*(log(zu/10.) - zpsi_m))
867	!!
868	!! Shifting temperature and humidity at zu : (L & Y eq. (9b-9c))
869	! T_zu = T_zt - T_star/kappa*(log(zt/zu) + psi_h(zeta_u) - psi_h(zeta_t))
870	T_zu = T_zt - T_star/kappa*(log(zt/zu) + zpsi_hu - zpsi_ht)
871	! q_zu = q_zt - q_star/kappa*(log(zt/zu) + psi_h(zeta_u) - psi_h(zeta_t))
872	q_zu = q_zt - q_star/kappa*(log(zt/zu) + zpsi_hu - zpsi_ht)
873	!!
874	!! q_zu cannot have a negative value : forcing 0
875	stab = 0.5 + sign(0.5,q_zu) ; q_zu = stab*q_zu
876	!!
877	IF( ln_cdgw ) THEN
878	sqrt_Cd=kappa/((kappa/sqrt_Cd_n10) - zpsi_m) ; Cd=sqrt_Cd*sqrt_Cd;
879	ELSE
880	!! Updating the neutral 10m transfer coefficients :
881	Cd_n10 = 1E-3 * (2.7/U_n10 + 0.142 + U_n10/13.09) ! L & Y eq. (6a)
882	sqrt_Cd_n10 = sqrt(Cd_n10)
883	Ce_n10 = 1E-3 * (34.6 * sqrt_Cd_n10) ! L & Y eq. (6b)
884	stab = 0.5 + sign(0.5,zeta_u)
885	Ch_n10 = 1E-3sqrt_Cd_n10(18.stab + 32.7(1-stab)) ! L & Y eq. (6c-6d)
886	!!
887	!!
888	!! Shifting the neutral 10m transfer coefficients to (zu,zeta_u) :
889	xct = 1. + sqrt_Cd_n10/kappa*(log(zu/10.) - zpsi_m)
890	Cd = Cd_n10/(xct*xct) ; sqrt_Cd = sqrt(Cd)
891	ENDIF
892	!!
893	xlogt = log(zu/10.) - zpsi_hu
894	!!
895	xct = 1. + Ch_n10*xlogt/kappa/sqrt_Cd_n10
896	Ch = Ch_n10*sqrt_Cd/sqrt_Cd_n10/xct
897	!!
898	xct = 1. + Ce_n10*xlogt/kappa/sqrt_Cd_n10
899	Ce = Ce_n10*sqrt_Cd/sqrt_Cd_n10/xct
900	!!
901	!!
902	END DO
903	!!
904	CALL wrk_dealloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
905	CALL wrk_dealloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta_u, zeta_t, U_n10 )
906	CALL wrk_dealloc( jpi,jpj, xlogt, xct, zpsi_hu, zpsi_ht, zpsi_m )
907	CALL wrk_dealloc( jpi,jpj, stab ) ! interger
908	!
909	IF( nn_timing == 1 ) CALL timing_stop('TURB_CORE_2Z')
910	!
911	END SUBROUTINE TURB_CORE_2Z
912
913
914	FUNCTION psi_m(zta) !! Psis, L & Y eq. (8c), (8d), (8e)
915	!-------------------------------------------------------------------------------
916	REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: zta
917
918	REAL(wp), PARAMETER :: pi = 3.141592653589793_wp
919	REAL(wp), DIMENSION(jpi,jpj) :: psi_m
920	REAL(wp), DIMENSION(:,:), POINTER :: X2, X, stabit
921	!-------------------------------------------------------------------------------
922
923	CALL wrk_alloc( jpi,jpj, X2, X, stabit )
924
925	X2 = sqrt(abs(1. - 16.*zta)) ; X2 = max(X2 , 1.0) ; X = sqrt(X2)
926	stabit = 0.5 + sign(0.5,zta)
927	psi_m = -5.ztastabit & ! Stable
928	& + (1. - stabit)(2log((1. + X)/2) + log((1. + X2)/2) - 2*atan(X) + pi/2) ! Unstable
929
930	CALL wrk_dealloc( jpi,jpj, X2, X, stabit )
931	!
932	END FUNCTION psi_m
933
934
935	FUNCTION psi_h( zta ) !! Psis, L & Y eq. (8c), (8d), (8e)
936	!-------------------------------------------------------------------------------
937	REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: zta
938	!
939	REAL(wp), DIMENSION(jpi,jpj) :: psi_h
940	REAL(wp), DIMENSION(:,:), POINTER :: X2, X, stabit
941	!-------------------------------------------------------------------------------
942
943	CALL wrk_alloc( jpi,jpj, X2, X, stabit )
944
945	X2 = sqrt(abs(1. - 16.*zta)) ; X2 = max(X2 , 1.) ; X = sqrt(X2)
946	stabit = 0.5 + sign(0.5,zta)
947	psi_h = -5.ztastabit & ! Stable
948	& + (1. - stabit)(2.log( (1. + X2)/2. )) ! Unstable
949
950	CALL wrk_dealloc( jpi,jpj, X2, X, stabit )
951	!
952	END FUNCTION psi_h
953
954	!!======================================================================
955	END MODULE sbcblk_core

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