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sbcblk_core.F90 in branches/2013/dev_r3853_CNRS9_ConfSetting/NEMOGCM/NEMO/OPA_SRC/SBC – NEMO

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source: branches/2013/dev_r3853_CNRS9_ConfSetting/NEMOGCM/NEMO/OPA_SRC/SBC/sbcblk_core.F90 @ 3875

Last change on this file since 3875 was 3875, checked in by clevy, 11 years ago
Configuration Setting/Step? 1, see ticket:#1074
Property svn:keywords set to `Id`
File size: 55.0 KB

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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 cyclone ! Cyclone 10m wind form trac of cyclone centres
32	USE sbcdcy ! surface boundary condition: diurnal cycle
33	USE iom ! I/O manager library
34	USE in_out_manager ! I/O manager
35	USE lib_mpp ! distribued memory computing library
36	USE wrk_nemo ! work arrays
37	USE timing ! Timing
38	USE lbclnk ! ocean lateral boundary conditions (or mpp link)
39	USE prtctl ! Print control
40	USE sbcwave,ONLY : cdn_wave !wave module
41	#if defined key_lim3 \|\| defined key_cice
42	USE sbc_ice ! Surface boundary condition: ice fields
43	#endif
44
45	IMPLICIT NONE
46	PRIVATE
47
48	PUBLIC sbc_blk_core ! routine called in sbcmod module
49	PUBLIC blk_ice_core ! routine called in sbc_ice_lim module
50	PUBLIC turb_core_2z ! routine calles in sbcblk_mfs module
51
52	INTEGER , PARAMETER :: jpfld = 9 ! maximum number of files to read
53	INTEGER , PARAMETER :: jp_wndi = 1 ! index of 10m wind velocity (i-component) (m/s) at T-point
54	INTEGER , PARAMETER :: jp_wndj = 2 ! index of 10m wind velocity (j-component) (m/s) at T-point
55	INTEGER , PARAMETER :: jp_humi = 3 ! index of specific humidity ( % )
56	INTEGER , PARAMETER :: jp_qsr = 4 ! index of solar heat (W/m2)
57	INTEGER , PARAMETER :: jp_qlw = 5 ! index of Long wave (W/m2)
58	INTEGER , PARAMETER :: jp_tair = 6 ! index of 10m air temperature (Kelvin)
59	INTEGER , PARAMETER :: jp_prec = 7 ! index of total precipitation (rain+snow) (Kg/m2/s)
60	INTEGER , PARAMETER :: jp_snow = 8 ! index of snow (solid prcipitation) (kg/m2/s)
61	INTEGER , PARAMETER :: jp_tdif = 9 ! index of tau diff associated to HF tau (N/m2) at T-point
62
63	TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf ! structure of input fields (file informations, fields read)
64
65	! !!! CORE bulk parameters
66	REAL(wp), PARAMETER :: rhoa = 1.22 ! air density
67	REAL(wp), PARAMETER :: cpa = 1000.5 ! specific heat of air
68	REAL(wp), PARAMETER :: Lv = 2.5e6 ! latent heat of vaporization
69	REAL(wp), PARAMETER :: Ls = 2.839e6 ! latent heat of sublimation
70	REAL(wp), PARAMETER :: Stef = 5.67e-8 ! Stefan Boltzmann constant
71	REAL(wp), PARAMETER :: Cice = 1.63e-3 ! transfer coefficient over ice
72	REAL(wp), PARAMETER :: albo = 0.066 ! ocean albedo assumed to be constant
73
74	! !!* Namelist namsbc_core : CORE bulk parameters
75	LOGICAL :: ln_2m = .FALSE. ! logical flag for height of air temp. and hum
76	LOGICAL :: ln_taudif = .FALSE. ! logical flag to use the "mean of stress module - module of mean stress" data
77	REAL(wp) :: rn_pfac = 1. ! multiplication factor for precipitation
78
79	!! * Substitutions
80	# include "domzgr_substitute.h90"
81	# include "vectopt_loop_substitute.h90"
82	!!----------------------------------------------------------------------
83	!! NEMO/OPA 3.3 , NEMO-consortium (2010)
84	!! $Id$
85	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
86	!!----------------------------------------------------------------------
87	CONTAINS
88
89	SUBROUTINE sbc_blk_core( kt )
90	!!---------------------------------------------------------------------
91	!! * ROUTINE sbc_blk_core *
92	!!
93	!! ** Purpose : provide at each time step the surface ocean fluxes
94	!! (momentum, heat, freshwater and runoff)
95	!!
96	!! ** Method : (1) READ each fluxes in NetCDF files:
97	!! the 10m wind velocity (i-component) (m/s) at T-point
98	!! the 10m wind velocity (j-component) (m/s) at T-point
99	!! the 10m or 2m specific humidity ( % )
100	!! the solar heat (W/m2)
101	!! the Long wave (W/m2)
102	!! the 10m or 2m air temperature (Kelvin)
103	!! the total precipitation (rain+snow) (Kg/m2/s)
104	!! the snow (solid prcipitation) (kg/m2/s)
105	!! the tau diff associated to HF tau (N/m2) at T-point (ln_taudif=T)
106	!! (2) CALL blk_oce_core
107	!!
108	!! C A U T I O N : never mask the surface stress fields
109	!! the stress is assumed to be in the (i,j) mesh referential
110	!!
111	!! ** Action : defined at each time-step at the air-sea interface
112	!! - utau, vtau i- and j-component of the wind stress
113	!! - taum, wndm wind stress and 10m wind modules at T-point
114	!! - qns, qsr non-solar and solar heat fluxes
115	!! - emp upward mass flux (evapo. - precip.)
116	!! - sfx salt flux due to freezing/melting (non-zero only if ice is present)
117	!! (set in limsbc(_2).F90)
118	!!----------------------------------------------------------------------
119	INTEGER, INTENT(in) :: kt ! ocean time step
120	!!
121	INTEGER :: ierror ! return error code
122	INTEGER :: ifpr ! dummy loop indice
123	INTEGER :: jfld ! dummy loop arguments
124	INTEGER :: ios ! Local integer output status for namelist read
125	!!
126	CHARACTER(len=100) :: cn_dir ! Root directory for location of core files
127	TYPE(FLD_N), DIMENSION(jpfld) :: slf_i ! array of namelist informations on the fields to read
128	TYPE(FLD_N) :: sn_wndi, sn_wndj, sn_humi, sn_qsr ! informations about the fields to be read
129	TYPE(FLD_N) :: sn_qlw , sn_tair, sn_prec, sn_snow, sn_tdif ! - -
130	NAMELIST/namsbc_core/ cn_dir , ln_2m , ln_taudif, rn_pfac, &
131	& sn_wndi, sn_wndj, sn_humi , sn_qsr , &
132	& sn_qlw , sn_tair, sn_prec , sn_snow, sn_tdif
133	!!---------------------------------------------------------------------
134
135	! ! ====================== !
136	IF( kt == nit000 ) THEN ! First call kt=nit000 !
137	! ! ====================== !
138	! set file information (default values)
139	cn_dir = './' ! directory in which the model is executed
140	!
141	! (NB: frequency positive => hours, negative => months)
142	! ! file ! frequency ! variable ! time intep ! clim ! 'yearly' or ! weights ! rotation !
143	! ! name ! (hours) ! name ! (T/F) ! (T/F) ! 'monthly' ! filename ! pairs !
144	sn_wndi = FLD_N( 'uwnd10m', 24 , 'u_10' , .false. , .false. , 'yearly' , '' , '' )
145	sn_wndj = FLD_N( 'vwnd10m', 24 , 'v_10' , .false. , .false. , 'yearly' , '' , '' )
146	sn_qsr = FLD_N( 'qsw' , 24 , 'qsw' , .false. , .false. , 'yearly' , '' , '' )
147	sn_qlw = FLD_N( 'qlw' , 24 , 'qlw' , .false. , .false. , 'yearly' , '' , '' )
148	sn_tair = FLD_N( 'tair10m', 24 , 't_10' , .false. , .false. , 'yearly' , '' , '' )
149	sn_humi = FLD_N( 'humi10m', 24 , 'q_10' , .false. , .false. , 'yearly' , '' , '' )
150	sn_prec = FLD_N( 'precip' , -1 , 'precip' , .true. , .false. , 'yearly' , '' , '' )
151	sn_snow = FLD_N( 'snow' , -1 , 'snow' , .true. , .false. , 'yearly' , '' , '' )
152	sn_tdif = FLD_N( 'taudif' , 24 , 'taudif' , .true. , .false. , 'yearly' , '' , '' )
153	!
154
155	REWIND( numnam_ref ) ! Namelist namsbc_core in reference namelist : CORE bulk parameters
156	READ ( numnam_ref, namsbc_core, IOSTAT = ios, ERR = 901)
157	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_core in reference namelist', lwp )
158
159	REWIND( numnam_cfg ) ! Namelist namsbc_core in configuration namelist : CORE bulk parameters
160	READ ( numnam_cfg, namsbc_core, IOSTAT = ios, ERR = 902 )
161	902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_core in configuration namelist', lwp )
162	WRITE ( numond, namsbc_core )
163	! ! check: do we plan to use ln_dm2dc with non-daily forcing?
164	IF( ln_dm2dc .AND. sn_qsr%nfreqh /= 24 ) &
165	& CALL ctl_stop( 'sbc_blk_core: ln_dm2dc can be activated only with daily short-wave forcing' )
166	IF( ln_dm2dc .AND. sn_qsr%ln_tint ) THEN
167	CALL ctl_warn( 'sbc_blk_core: ln_dm2dc is taking care of the temporal interpolation of daily qsr', &
168	& ' ==> We force time interpolation = .false. for qsr' )
169	sn_qsr%ln_tint = .false.
170	ENDIF
171	! ! store namelist information in an array
172	slf_i(jp_wndi) = sn_wndi ; slf_i(jp_wndj) = sn_wndj
173	slf_i(jp_qsr ) = sn_qsr ; slf_i(jp_qlw ) = sn_qlw
174	slf_i(jp_tair) = sn_tair ; slf_i(jp_humi) = sn_humi
175	slf_i(jp_prec) = sn_prec ; slf_i(jp_snow) = sn_snow
176	slf_i(jp_tdif) = sn_tdif
177	!
178	lhftau = ln_taudif ! do we use HF tau information?
179	jfld = jpfld - COUNT( (/.NOT. lhftau/) )
180	!
181	ALLOCATE( sf(jfld), STAT=ierror ) ! set sf structure
182	IF( ierror > 0 ) CALL ctl_stop( 'STOP', 'sbc_blk_core: unable to allocate sf structure' )
183	DO ifpr= 1, jfld
184	ALLOCATE( sf(ifpr)%fnow(jpi,jpj,1) )
185	IF( slf_i(ifpr)%ln_tint ) ALLOCATE( sf(ifpr)%fdta(jpi,jpj,1,2) )
186	END DO
187	! ! fill sf with slf_i and control print
188	CALL fld_fill( sf, slf_i, cn_dir, 'sbc_blk_core', 'flux formulation for ocean surface boundary condition', 'namsbc_core' )
189	!
190	sfx(:,:) = 0._wp ! salt flux; zero unless ice is present (computed in limsbc(_2).F90)
191	!
192	ENDIF
193
194	CALL fld_read( kt, nn_fsbc, sf ) ! input fields provided at the current time-step
195
196	! ! compute the surface ocean fluxes using CORE bulk formulea
197	IF( MOD( kt - 1, nn_fsbc ) == 0 ) CALL blk_oce_core( kt, sf, sst_m, ssu_m, ssv_m )
198
199	#if defined key_cice
200	IF( MOD( kt - 1, nn_fsbc ) == 0 ) THEN
201	qlw_ice(:,:,1) = sf(jp_qlw)%fnow(:,:,1)
202	qsr_ice(:,:,1) = sf(jp_qsr)%fnow(:,:,1)
203	tatm_ice(:,:) = sf(jp_tair)%fnow(:,:,1)
204	qatm_ice(:,:) = sf(jp_humi)%fnow(:,:,1)
205	tprecip(:,:) = sf(jp_prec)%fnow(:,:,1) * rn_pfac
206	sprecip(:,:) = sf(jp_snow)%fnow(:,:,1) * rn_pfac
207	wndi_ice(:,:) = sf(jp_wndi)%fnow(:,:,1)
208	wndj_ice(:,:) = sf(jp_wndj)%fnow(:,:,1)
209	ENDIF
210	#endif
211	!
212	END SUBROUTINE sbc_blk_core
213
214
215	SUBROUTINE blk_oce_core( kt, sf, pst, pu, pv )
216	!!---------------------------------------------------------------------
217	!! * ROUTINE blk_core *
218	!!
219	!! ** Purpose : provide the momentum, heat and freshwater fluxes at
220	!! the ocean surface at each time step
221	!!
222	!! ** Method : CORE bulk formulea for the ocean using atmospheric
223	!! fields read in sbc_read
224	!!
225	!! ** Outputs : - utau : i-component of the stress at U-point (N/m2)
226	!! - vtau : j-component of the stress at V-point (N/m2)
227	!! - taum : Wind stress module at T-point (N/m2)
228	!! - wndm : Wind speed module at T-point (m/s)
229	!! - qsr : Solar heat flux over the ocean (W/m2)
230	!! - qns : Non Solar heat flux over the ocean (W/m2)
231	!! - evap : Evaporation over the ocean (kg/m2/s)
232	!! - emp : evaporation minus precipitation (kg/m2/s)
233	!!
234	!! ** Nota : sf has to be a dummy argument for AGRIF on NEC
235	!!---------------------------------------------------------------------
236	INTEGER , INTENT(in ) :: kt ! time step index
237	TYPE(fld), INTENT(inout), DIMENSION(:) :: sf ! input data
238	REAL(wp) , INTENT(in) , DIMENSION(:,:) :: pst ! surface temperature [Celcius]
239	REAL(wp) , INTENT(in) , DIMENSION(:,:) :: pu ! surface current at U-point (i-component) [m/s]
240	REAL(wp) , INTENT(in) , DIMENSION(:,:) :: pv ! surface current at V-point (j-component) [m/s]
241	!
242	INTEGER :: ji, jj ! dummy loop indices
243	REAL(wp) :: zcoef_qsatw, zztmp ! local variable
244	REAL(wp), DIMENSION(:,:), POINTER :: zwnd_i, zwnd_j ! wind speed components at T-point
245	REAL(wp), DIMENSION(:,:), POINTER :: zqsatw ! specific humidity at pst
246	REAL(wp), DIMENSION(:,:), POINTER :: zqlw, zqsb ! long wave and sensible heat fluxes
247	REAL(wp), DIMENSION(:,:), POINTER :: zqla, zevap ! latent heat fluxes and evaporation
248	REAL(wp), DIMENSION(:,:), POINTER :: Cd ! transfer coefficient for momentum (tau)
249	REAL(wp), DIMENSION(:,:), POINTER :: Ch ! transfer coefficient for sensible heat (Q_sens)
250	REAL(wp), DIMENSION(:,:), POINTER :: Ce ! tansfert coefficient for evaporation (Q_lat)
251	REAL(wp), DIMENSION(:,:), POINTER :: zst ! surface temperature in Kelvin
252	REAL(wp), DIMENSION(:,:), POINTER :: zt_zu ! air temperature at wind speed height
253	REAL(wp), DIMENSION(:,:), POINTER :: zq_zu ! air spec. hum. at wind speed height
254	!!---------------------------------------------------------------------
255	!
256	IF( nn_timing == 1 ) CALL timing_start('blk_oce_core')
257	!
258	CALL wrk_alloc( jpi,jpj, zwnd_i, zwnd_j, zqsatw, zqlw, zqsb, zqla, zevap )
259	CALL wrk_alloc( jpi,jpj, Cd, Ch, Ce, zst, zt_zu, zq_zu )
260	!
261	! local scalars ( place there for vector optimisation purposes)
262	zcoef_qsatw = 0.98 * 640380. / rhoa
263
264	zst(:,:) = pst(:,:) + rt0 ! convert SST from Celcius to Kelvin (and set minimum value far above 0 K)
265
266	! ----------------------------------------------------------------------------- !
267	! 0 Wind components and module at T-point relative to the moving ocean !
268	! ----------------------------------------------------------------------------- !
269
270	! ... components ( U10m - U_oce ) at T-point (unmasked)
271	zwnd_i(:,:) = 0.e0
272	zwnd_j(:,:) = 0.e0
273	#if defined key_cyclone
274	# if defined key_vectopt_loop
275	!CDIR COLLAPSE
276	# endif
277	CALL wnd_cyc( kt, zwnd_i, zwnd_j ) ! add Manu !
278	DO jj = 2, jpjm1
279	DO ji = fs_2, fs_jpim1 ! vect. opt.
280	sf(jp_wndi)%fnow(ji,jj,1) = sf(jp_wndi)%fnow(ji,jj,1) + zwnd_i(ji,jj)
281	sf(jp_wndj)%fnow(ji,jj,1) = sf(jp_wndj)%fnow(ji,jj,1) + zwnd_j(ji,jj)
282	END DO
283	END DO
284	#endif
285	#if defined key_vectopt_loop
286	!CDIR COLLAPSE
287	#endif
288	DO jj = 2, jpjm1
289	DO ji = fs_2, fs_jpim1 ! vect. opt.
290	zwnd_i(ji,jj) = ( sf(jp_wndi)%fnow(ji,jj,1) - 0.5 * ( pu(ji-1,jj ) + pu(ji,jj) ) )
291	zwnd_j(ji,jj) = ( sf(jp_wndj)%fnow(ji,jj,1) - 0.5 * ( pv(ji ,jj-1) + pv(ji,jj) ) )
292	END DO
293	END DO
294	CALL lbc_lnk( zwnd_i(:,:) , 'T', -1. )
295	CALL lbc_lnk( zwnd_j(:,:) , 'T', -1. )
296	! ... scalar wind ( = \| U10m - U_oce \| ) at T-point (masked)
297	!CDIR NOVERRCHK
298	!CDIR COLLAPSE
299	wndm(:,:) = SQRT( zwnd_i(:,:) * zwnd_i(:,:) &
300	& + zwnd_j(:,:) * zwnd_j(:,:) ) * tmask(:,:,1)
301
302	! ----------------------------------------------------------------------------- !
303	! I Radiative FLUXES !
304	! ----------------------------------------------------------------------------- !
305
306	! ocean albedo assumed to be constant + modify now Qsr to include the diurnal cycle ! Short Wave
307	zztmp = 1. - albo
308	IF( ln_dm2dc ) THEN ; qsr(:,:) = zztmp * sbc_dcy( sf(jp_qsr)%fnow(:,:,1) ) * tmask(:,:,1)
309	ELSE ; qsr(:,:) = zztmp * sf(jp_qsr)%fnow(:,:,1) * tmask(:,:,1)
310	ENDIF
311	!CDIR COLLAPSE
312	zqlw(:,:) = ( sf(jp_qlw)%fnow(:,:,1) - Stef * zst(:,:)zst(:,:)zst(:,:)zst(:,:) ) tmask(:,:,1) ! Long Wave
313	! ----------------------------------------------------------------------------- !
314	! II Turbulent FLUXES !
315	! ----------------------------------------------------------------------------- !
316
317	! ... specific humidity at SST and IST
318	!CDIR NOVERRCHK
319	!CDIR COLLAPSE
320	zqsatw(:,:) = zcoef_qsatw * EXP( -5107.4 / zst(:,:) )
321
322	! ... NCAR Bulk formulae, computation of Cd, Ch, Ce at T-point :
323	IF( ln_2m ) THEN
324	!! If air temp. and spec. hum. are given at different height (2m) than wind (10m) :
325	CALL TURB_CORE_2Z(2.,10., zst , sf(jp_tair)%fnow, &
326	& zqsatw, sf(jp_humi)%fnow, wndm, &
327	& Cd , Ch , Ce , &
328	& zt_zu , zq_zu )
329	ELSE
330	!! If air temp. and spec. hum. are given at same height than wind (10m) :
331	!gm bug? at the compiling phase, add a copy in temporary arrays... ==> check perf
332	! CALL TURB_CORE_1Z( 10., zst (:,:), sf(jp_tair)%fnow(:,:), &
333	! & zqsatw(:,:), sf(jp_humi)%fnow(:,:), wndm(:,:), &
334	! & Cd (:,:), Ch (:,:), Ce (:,:) )
335	!gm bug
336	! ARPDBG - this won't compile with gfortran. Fix but check performance
337	! as per comment above.
338	CALL TURB_CORE_1Z( 10., zst , sf(jp_tair)%fnow(:,:,1), &
339	& zqsatw, sf(jp_humi)%fnow(:,:,1), wndm, &
340	& Cd , Ch , Ce )
341	ENDIF
342
343	! ... tau module, i and j component
344	DO jj = 1, jpj
345	DO ji = 1, jpi
346	zztmp = rhoa * wndm(ji,jj) * Cd(ji,jj)
347	taum (ji,jj) = zztmp * wndm (ji,jj)
348	zwnd_i(ji,jj) = zztmp * zwnd_i(ji,jj)
349	zwnd_j(ji,jj) = zztmp * zwnd_j(ji,jj)
350	END DO
351	END DO
352
353	! ... add the HF tau contribution to the wind stress module?
354	IF( lhftau ) THEN
355	!CDIR COLLAPSE
356	taum(:,:) = taum(:,:) + sf(jp_tdif)%fnow(:,:,1)
357	ENDIF
358	CALL iom_put( "taum_oce", taum ) ! output wind stress module
359
360	! ... utau, vtau at U- and V_points, resp.
361	! Note the use of 0.5*(2-umask) in order to unmask the stress along coastlines
362	DO jj = 1, jpjm1
363	DO ji = 1, fs_jpim1
364	utau(ji,jj) = 0.5 * ( 2. - umask(ji,jj,1) ) * ( zwnd_i(ji,jj) + zwnd_i(ji+1,jj ) )
365	vtau(ji,jj) = 0.5 * ( 2. - vmask(ji,jj,1) ) * ( zwnd_j(ji,jj) + zwnd_j(ji ,jj+1) )
366	END DO
367	END DO
368	CALL lbc_lnk( utau(:,:), 'U', -1. )
369	CALL lbc_lnk( vtau(:,:), 'V', -1. )
370
371	! Turbulent fluxes over ocean
372	! -----------------------------
373	IF( ln_2m ) THEN
374	! Values of temp. and hum. adjusted to 10m must be used instead of 2m values
375	zevap(:,:) = MAX( 0.e0, rhoa Ce(:,:)( zqsatw(:,:) - zq_zu(:,:) ) * wndm(:,:) ) ! Evaporation
376	zqsb (:,:) = rhoacpaCh(:,:)( zst (:,:) - zt_zu(:,:) ) wndm(:,:) ! Sensible Heat
377	ELSE
378	!CDIR COLLAPSE
379	zevap(:,:) = MAX( 0.e0, rhoa Ce(:,:)( zqsatw(:,:) - sf(jp_humi)%fnow(:,:,1) ) * wndm(:,:) ) ! Evaporation
380	!CDIR COLLAPSE
381	zqsb (:,:) = rhoacpaCh(:,:)( zst (:,:) - sf(jp_tair)%fnow(:,:,1) ) wndm(:,:) ! Sensible Heat
382	ENDIF
383	!CDIR COLLAPSE
384	zqla (:,:) = Lv * zevap(:,:) ! Latent Heat
385
386	IF(ln_ctl) THEN
387	CALL prt_ctl( tab2d_1=zqla , clinfo1=' blk_oce_core: zqla : ', tab2d_2=Ce , clinfo2=' Ce : ' )
388	CALL prt_ctl( tab2d_1=zqsb , clinfo1=' blk_oce_core: zqsb : ', tab2d_2=Ch , clinfo2=' Ch : ' )
389	CALL prt_ctl( tab2d_1=zqlw , clinfo1=' blk_oce_core: zqlw : ', tab2d_2=qsr, clinfo2=' qsr : ' )
390	CALL prt_ctl( tab2d_1=zqsatw, clinfo1=' blk_oce_core: zqsatw : ', tab2d_2=zst, clinfo2=' zst : ' )
391	CALL prt_ctl( tab2d_1=utau , clinfo1=' blk_oce_core: utau : ', mask1=umask, &
392	& tab2d_2=vtau , clinfo2= ' vtau : ' , mask2=vmask )
393	CALL prt_ctl( tab2d_1=wndm , clinfo1=' blk_oce_core: wndm : ')
394	CALL prt_ctl( tab2d_1=zst , clinfo1=' blk_oce_core: zst : ')
395	ENDIF
396
397	! ----------------------------------------------------------------------------- !
398	! III Total FLUXES !
399	! ----------------------------------------------------------------------------- !
400
401	!CDIR COLLAPSE
402	emp (:,:) = ( zevap(:,:) & ! mass flux (evap. - precip.)
403	& - sf(jp_prec)%fnow(:,:,1) * rn_pfac ) * tmask(:,:,1)
404	!CDIR COLLAPSE
405	qns(:,:) = zqlw(:,:) - zqsb(:,:) - zqla(:,:) & ! Downward Non Solar flux
406	& - sf(jp_snow)%fnow(:,:,1) * rn_pfac * lfus & ! remove latent melting heat for solid precip
407	& - zevap(:,:) * pst(:,:) * rcp & ! remove evap heat content at SST
408	& + ( sf(jp_prec)%fnow(:,:,1) - sf(jp_snow)%fnow(:,:,1) ) * rn_pfac & ! add liquid precip heat content at Tair
409	& * ( sf(jp_tair)%fnow(:,:,1) - rt0 ) * rcp &
410	& + sf(jp_snow)%fnow(:,:,1) * rn_pfac & ! add solid precip heat content at min(Tair,Tsnow)
411	& * ( MIN( sf(jp_tair)%fnow(:,:,1), rt0_snow ) - rt0 ) * cpic
412	!
413	CALL iom_put( "qlw_oce", zqlw ) ! output downward longwave heat over the ocean
414	CALL iom_put( "qsb_oce", - zqsb ) ! output downward sensible heat over the ocean
415	CALL iom_put( "qla_oce", - zqla ) ! output downward latent heat over the ocean
416	CALL iom_put( "qhc_oce", qns-zqlw+zqsb+zqla ) ! output downward heat content of E-P over the ocean
417	CALL iom_put( "qns_oce", qns ) ! output downward non solar heat over the ocean
418	!
419	IF(ln_ctl) THEN
420	CALL prt_ctl(tab2d_1=zqsb , clinfo1=' blk_oce_core: zqsb : ', tab2d_2=zqlw , clinfo2=' zqlw : ')
421	CALL prt_ctl(tab2d_1=zqla , clinfo1=' blk_oce_core: zqla : ', tab2d_2=qsr , clinfo2=' qsr : ')
422	CALL prt_ctl(tab2d_1=pst , clinfo1=' blk_oce_core: pst : ', tab2d_2=emp , clinfo2=' emp : ')
423	CALL prt_ctl(tab2d_1=utau , clinfo1=' blk_oce_core: utau : ', mask1=umask, &
424	& tab2d_2=vtau , clinfo2= ' vtau : ' , mask2=vmask )
425	ENDIF
426	!
427	CALL wrk_dealloc( jpi,jpj, zwnd_i, zwnd_j, zqsatw, zqlw, zqsb, zqla, zevap )
428	CALL wrk_dealloc( jpi,jpj, Cd, Ch, Ce, zst, zt_zu, zq_zu )
429	!
430	IF( nn_timing == 1 ) CALL timing_stop('blk_oce_core')
431	!
432	END SUBROUTINE blk_oce_core
433
434
435	SUBROUTINE blk_ice_core( pst , pui , pvi , palb , &
436	& p_taui, p_tauj, p_qns , p_qsr, &
437	& p_qla , p_dqns, p_dqla, &
438	& p_tpr , p_spr , &
439	& p_fr1 , p_fr2 , cd_grid, pdim )
440	!!---------------------------------------------------------------------
441	!! * ROUTINE blk_ice_core *
442	!!
443	!! ** Purpose : provide the surface boundary condition over sea-ice
444	!!
445	!! ** Method : compute momentum, heat and freshwater exchanged
446	!! between atmosphere and sea-ice using CORE bulk
447	!! formulea, ice variables and read atmmospheric fields.
448	!! NB: ice drag coefficient is assumed to be a constant
449	!!
450	!! caution : the net upward water flux has with mm/day unit
451	!!---------------------------------------------------------------------
452	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: pst ! ice surface temperature (>0, =rt0 over land) [Kelvin]
453	REAL(wp), DIMENSION(:,:) , INTENT(in ) :: pui ! ice surface velocity (i- and i- components [m/s]
454	REAL(wp), DIMENSION(:,:) , INTENT(in ) :: pvi ! at I-point (B-grid) or U & V-point (C-grid)
455	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: palb ! ice albedo (clear sky) (alb_ice_cs) [%]
456	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_taui ! i- & j-components of surface ice stress [N/m2]
457	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_tauj ! at I-point (B-grid) or U & V-point (C-grid)
458	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qns ! non solar heat flux over ice (T-point) [W/m2]
459	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qsr ! solar heat flux over ice (T-point) [W/m2]
460	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qla ! latent heat flux over ice (T-point) [W/m2]
461	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_dqns ! non solar heat sensistivity (T-point) [W/m2]
462	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_dqla ! latent heat sensistivity (T-point) [W/m2]
463	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_tpr ! total precipitation (T-point) [Kg/m2/s]
464	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_spr ! solid precipitation (T-point) [Kg/m2/s]
465	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_fr1 ! 1sr fraction of qsr penetration in ice (T-point) [%]
466	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_fr2 ! 2nd fraction of qsr penetration in ice (T-point) [%]
467	CHARACTER(len=1) , INTENT(in ) :: cd_grid ! ice grid ( C or B-grid)
468	INTEGER , INTENT(in ) :: pdim ! number of ice categories
469	!!
470	INTEGER :: ji, jj, jl ! dummy loop indices
471	INTEGER :: ijpl ! number of ice categories (size of 3rd dim of input arrays)
472	REAL(wp) :: zst2, zst3
473	REAL(wp) :: zcoef_wnorm, zcoef_wnorm2, zcoef_dqlw, zcoef_dqla, zcoef_dqsb
474	REAL(wp) :: zztmp ! temporary variable
475	REAL(wp) :: zcoef_frca ! fractional cloud amount
476	REAL(wp) :: zwnorm_f, zwndi_f , zwndj_f ! relative wind module and components at F-point
477	REAL(wp) :: zwndi_t , zwndj_t ! relative wind components at T-point
478	!!
479	REAL(wp), DIMENSION(:,:) , POINTER :: z_wnds_t ! wind speed ( = \| U10m - U_ice \| ) at T-point
480	REAL(wp), DIMENSION(:,:,:), POINTER :: z_qlw ! long wave heat flux over ice
481	REAL(wp), DIMENSION(:,:,:), POINTER :: z_qsb ! sensible heat flux over ice
482	REAL(wp), DIMENSION(:,:,:), POINTER :: z_dqlw ! long wave heat sensitivity over ice
483	REAL(wp), DIMENSION(:,:,:), POINTER :: z_dqsb ! sensible heat sensitivity over ice
484	!!---------------------------------------------------------------------
485	!
486	IF( nn_timing == 1 ) CALL timing_start('blk_ice_core')
487	!
488	CALL wrk_alloc( jpi,jpj, z_wnds_t )
489	CALL wrk_alloc( jpi,jpj,pdim, z_qlw, z_qsb, z_dqlw, z_dqsb )
490
491	ijpl = pdim ! number of ice categories
492
493	! local scalars ( place there for vector optimisation purposes)
494	zcoef_wnorm = rhoa * Cice
495	zcoef_wnorm2 = rhoa * Cice * 0.5
496	zcoef_dqlw = 4.0 * 0.95 * Stef
497	zcoef_dqla = -Ls * Cice * 11637800. * (-5897.8)
498	zcoef_dqsb = rhoa * cpa * Cice
499	zcoef_frca = 1.0 - 0.3
500
501	!!gm brutal....
502	z_wnds_t(:,:) = 0.e0
503	p_taui (:,:) = 0.e0
504	p_tauj (:,:) = 0.e0
505	!!gm end
506
507	#if defined key_lim3
508	tatm_ice(:,:) = sf(jp_tair)%fnow(:,:,1) ! LIM3: make Tair available in sea-ice. WARNING allocated after call to ice_init
509	#endif
510	! ----------------------------------------------------------------------------- !
511	! Wind components and module relative to the moving ocean ( U10m - U_ice ) !
512	! ----------------------------------------------------------------------------- !
513	SELECT CASE( cd_grid )
514	CASE( 'I' ) ! B-grid ice dynamics : I-point (i.e. F-point with sea-ice indexation)
515	! and scalar wind at T-point ( = \| U10m - U_ice \| ) (masked)
516	!CDIR NOVERRCHK
517	DO jj = 2, jpjm1
518	DO ji = 2, jpim1 ! B grid : NO vector opt
519	! ... scalar wind at I-point (fld being at T-point)
520	zwndi_f = 0.25 * ( sf(jp_wndi)%fnow(ji-1,jj ,1) + sf(jp_wndi)%fnow(ji ,jj ,1) &
521	& + sf(jp_wndi)%fnow(ji-1,jj-1,1) + sf(jp_wndi)%fnow(ji ,jj-1,1) ) - pui(ji,jj)
522	zwndj_f = 0.25 * ( sf(jp_wndj)%fnow(ji-1,jj ,1) + sf(jp_wndj)%fnow(ji ,jj ,1) &
523	& + sf(jp_wndj)%fnow(ji-1,jj-1,1) + sf(jp_wndj)%fnow(ji ,jj-1,1) ) - pvi(ji,jj)
524	zwnorm_f = zcoef_wnorm * SQRT( zwndi_f * zwndi_f + zwndj_f * zwndj_f )
525	! ... ice stress at I-point
526	p_taui(ji,jj) = zwnorm_f * zwndi_f
527	p_tauj(ji,jj) = zwnorm_f * zwndj_f
528	! ... scalar wind at T-point (fld being at T-point)
529	zwndi_t = sf(jp_wndi)%fnow(ji,jj,1) - 0.25 * ( pui(ji,jj+1) + pui(ji+1,jj+1) &
530	& + pui(ji,jj ) + pui(ji+1,jj ) )
531	zwndj_t = sf(jp_wndj)%fnow(ji,jj,1) - 0.25 * ( pvi(ji,jj+1) + pvi(ji+1,jj+1) &
532	& + pvi(ji,jj ) + pvi(ji+1,jj ) )
533	z_wnds_t(ji,jj) = SQRT( zwndi_t * zwndi_t + zwndj_t * zwndj_t ) * tmask(ji,jj,1)
534	END DO
535	END DO
536	CALL lbc_lnk( p_taui , 'I', -1. )
537	CALL lbc_lnk( p_tauj , 'I', -1. )
538	CALL lbc_lnk( z_wnds_t, 'T', 1. )
539	!
540	CASE( 'C' ) ! C-grid ice dynamics : U & V-points (same as ocean)
541	#if defined key_vectopt_loop
542	!CDIR COLLAPSE
543	#endif
544	DO jj = 2, jpj
545	DO ji = fs_2, jpi ! vect. opt.
546	zwndi_t = ( sf(jp_wndi)%fnow(ji,jj,1) - 0.5 * ( pui(ji-1,jj ) + pui(ji,jj) ) )
547	zwndj_t = ( sf(jp_wndj)%fnow(ji,jj,1) - 0.5 * ( pvi(ji ,jj-1) + pvi(ji,jj) ) )
548	z_wnds_t(ji,jj) = SQRT( zwndi_t * zwndi_t + zwndj_t * zwndj_t ) * tmask(ji,jj,1)
549	END DO
550	END DO
551	#if defined key_vectopt_loop
552	!CDIR COLLAPSE
553	#endif
554	DO jj = 2, jpjm1
555	DO ji = fs_2, fs_jpim1 ! vect. opt.
556	p_taui(ji,jj) = zcoef_wnorm2 * ( z_wnds_t(ji+1,jj ) + z_wnds_t(ji,jj) ) &
557	& * ( 0.5 * (sf(jp_wndi)%fnow(ji+1,jj,1) + sf(jp_wndi)%fnow(ji,jj,1) ) - pui(ji,jj) )
558	p_tauj(ji,jj) = zcoef_wnorm2 * ( z_wnds_t(ji,jj+1 ) + z_wnds_t(ji,jj) ) &
559	& * ( 0.5 * (sf(jp_wndj)%fnow(ji,jj+1,1) + sf(jp_wndj)%fnow(ji,jj,1) ) - pvi(ji,jj) )
560	END DO
561	END DO
562	CALL lbc_lnk( p_taui , 'U', -1. )
563	CALL lbc_lnk( p_tauj , 'V', -1. )
564	CALL lbc_lnk( z_wnds_t, 'T', 1. )
565	!
566	END SELECT
567
568	zztmp = 1. / ( 1. - albo )
569	! ! ========================== !
570	DO jl = 1, ijpl ! Loop over ice categories !
571	! ! ========================== !
572	!CDIR NOVERRCHK
573	!CDIR COLLAPSE
574	DO jj = 1 , jpj
575	!CDIR NOVERRCHK
576	DO ji = 1, jpi
577	! ----------------------------!
578	! I Radiative FLUXES !
579	! ----------------------------!
580	zst2 = pst(ji,jj,jl) * pst(ji,jj,jl)
581	zst3 = pst(ji,jj,jl) * zst2
582	! Short Wave (sw)
583	p_qsr(ji,jj,jl) = zztmp * ( 1. - palb(ji,jj,jl) ) * qsr(ji,jj)
584	! Long Wave (lw)
585	z_qlw(ji,jj,jl) = 0.95 * ( sf(jp_qlw)%fnow(ji,jj,1) - Stef * pst(ji,jj,jl) * zst3 ) * tmask(ji,jj,1)
586	! lw sensitivity
587	z_dqlw(ji,jj,jl) = zcoef_dqlw * zst3
588
589	! ----------------------------!
590	! II Turbulent FLUXES !
591	! ----------------------------!
592
593	! ... turbulent heat fluxes
594	! Sensible Heat
595	z_qsb(ji,jj,jl) = rhoa * cpa * Cice * z_wnds_t(ji,jj) * ( pst(ji,jj,jl) - sf(jp_tair)%fnow(ji,jj,1) )
596	! Latent Heat
597	p_qla(ji,jj,jl) = MAX( 0.e0, rhoa * Ls * Cice * z_wnds_t(ji,jj) &
598	& * ( 11637800. * EXP( -5897.8 / pst(ji,jj,jl) ) / rhoa - sf(jp_humi)%fnow(ji,jj,1) ) )
599	! Latent heat sensitivity for ice (Dqla/Dt)
600	p_dqla(ji,jj,jl) = zcoef_dqla * z_wnds_t(ji,jj) / ( zst2 ) * EXP( -5897.8 / pst(ji,jj,jl) )
601	! Sensible heat sensitivity (Dqsb_ice/Dtn_ice)
602	z_dqsb(ji,jj,jl) = zcoef_dqsb * z_wnds_t(ji,jj)
603
604	! ----------------------------!
605	! III Total FLUXES !
606	! ----------------------------!
607	! Downward Non Solar flux
608	p_qns (ji,jj,jl) = z_qlw (ji,jj,jl) - z_qsb (ji,jj,jl) - p_qla (ji,jj,jl)
609	! Total non solar heat flux sensitivity for ice
610	p_dqns(ji,jj,jl) = - ( z_dqlw(ji,jj,jl) + z_dqsb(ji,jj,jl) + p_dqla(ji,jj,jl) )
611	END DO
612	!
613	END DO
614	!
615	END DO
616	!
617	!--------------------------------------------------------------------
618	! FRACTIONs of net shortwave radiation which is not absorbed in the
619	! thin surface layer and penetrates inside the ice cover
620	! ( Maykut and Untersteiner, 1971 ; Ebert and Curry, 1993 )
621
622	!CDIR COLLAPSE
623	p_fr1(:,:) = ( 0.18 * ( 1.0 - zcoef_frca ) + 0.35 * zcoef_frca )
624	!CDIR COLLAPSE
625	p_fr2(:,:) = ( 0.82 * ( 1.0 - zcoef_frca ) + 0.65 * zcoef_frca )
626
627	!CDIR COLLAPSE
628	p_tpr(:,:) = sf(jp_prec)%fnow(:,:,1) * rn_pfac ! total precipitation [kg/m2/s]
629	!CDIR COLLAPSE
630	p_spr(:,:) = sf(jp_snow)%fnow(:,:,1) * rn_pfac ! solid precipitation [kg/m2/s]
631	CALL iom_put( 'snowpre', p_spr ) ! Snow precipitation
632	!
633	IF(ln_ctl) THEN
634	CALL prt_ctl(tab3d_1=p_qla , clinfo1=' blk_ice_core: p_qla : ', tab3d_2=z_qsb , clinfo2=' z_qsb : ', kdim=ijpl)
635	CALL prt_ctl(tab3d_1=z_qlw , clinfo1=' blk_ice_core: z_qlw : ', tab3d_2=p_dqla , clinfo2=' p_dqla : ', kdim=ijpl)
636	CALL prt_ctl(tab3d_1=z_dqsb , clinfo1=' blk_ice_core: z_dqsb : ', tab3d_2=z_dqlw , clinfo2=' z_dqlw : ', kdim=ijpl)
637	CALL prt_ctl(tab3d_1=p_dqns , clinfo1=' blk_ice_core: p_dqns : ', tab3d_2=p_qsr , clinfo2=' p_qsr : ', kdim=ijpl)
638	CALL prt_ctl(tab3d_1=pst , clinfo1=' blk_ice_core: pst : ', tab3d_2=p_qns , clinfo2=' p_qns : ', kdim=ijpl)
639	CALL prt_ctl(tab2d_1=p_tpr , clinfo1=' blk_ice_core: p_tpr : ', tab2d_2=p_spr , clinfo2=' p_spr : ')
640	CALL prt_ctl(tab2d_1=p_taui , clinfo1=' blk_ice_core: p_taui : ', tab2d_2=p_tauj , clinfo2=' p_tauj : ')
641	CALL prt_ctl(tab2d_1=z_wnds_t, clinfo1=' blk_ice_core: z_wnds_t : ')
642	ENDIF
643
644	CALL wrk_dealloc( jpi,jpj, z_wnds_t )
645	CALL wrk_dealloc( jpi,jpj,pdim, z_qlw, z_qsb, z_dqlw, z_dqsb )
646	!
647	IF( nn_timing == 1 ) CALL timing_stop('blk_ice_core')
648	!
649	END SUBROUTINE blk_ice_core
650
651
652	SUBROUTINE TURB_CORE_1Z(zu, sst, T_a, q_sat, q_a, &
653	& dU , Cd , Ch , Ce )
654	!!----------------------------------------------------------------------
655	!! * ROUTINE turb_core *
656	!!
657	!! ** Purpose : Computes turbulent transfert coefficients of surface
658	!! fluxes according to Large & Yeager (2004)
659	!!
660	!! ** 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
661	!! Momentum, Latent and sensible heat exchange coefficients
662	!! Caution: this procedure should only be used in cases when air
663	!! temperature (T_air), air specific humidity (q_air) and wind (dU)
664	!! are provided at the same height 'zzu'!
665	!!
666	!! References : Large & Yeager, 2004 : ???
667	!!----------------------------------------------------------------------
668	REAL(wp) , INTENT(in ) :: zu ! altitude of wind measurement [m]
669	REAL(wp), DIMENSION(:,:), INTENT(in ) :: sst ! sea surface temperature [Kelvin]
670	REAL(wp), DIMENSION(:,:), INTENT(in ) :: T_a ! potential air temperature [Kelvin]
671	REAL(wp), DIMENSION(:,:), INTENT(in ) :: q_sat ! sea surface specific humidity [kg/kg]
672	REAL(wp), DIMENSION(:,:), INTENT(in ) :: q_a ! specific air humidity [kg/kg]
673	REAL(wp), DIMENSION(:,:), INTENT(in ) :: dU ! wind module \|U(zu)-U(0)\| [m/s]
674	REAL(wp), DIMENSION(:,:), INTENT( out) :: Cd ! transfert coefficient for momentum (tau)
675	REAL(wp), DIMENSION(:,:), INTENT( out) :: Ch ! transfert coefficient for temperature (Q_sens)
676	REAL(wp), DIMENSION(:,:), INTENT( out) :: Ce ! transfert coefficient for evaporation (Q_lat)
677	!!
678	INTEGER :: j_itt
679	INTEGER , PARAMETER :: nb_itt = 3
680	REAL(wp), PARAMETER :: grav = 9.8 ! gravity
681	REAL(wp), PARAMETER :: kappa = 0.4 ! von Karman s constant
682
683	REAL(wp), DIMENSION(:,:), POINTER :: dU10 ! dU [m/s]
684	REAL(wp), DIMENSION(:,:), POINTER :: dT ! air/sea temperature differeence [K]
685	REAL(wp), DIMENSION(:,:), POINTER :: dq ! air/sea humidity difference [K]
686	REAL(wp), DIMENSION(:,:), POINTER :: Cd_n10 ! 10m neutral drag coefficient
687	REAL(wp), DIMENSION(:,:), POINTER :: Ce_n10 ! 10m neutral latent coefficient
688	REAL(wp), DIMENSION(:,:), POINTER :: Ch_n10 ! 10m neutral sensible coefficient
689	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd_n10 ! root square of Cd_n10
690	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd ! root square of Cd
691	REAL(wp), DIMENSION(:,:), POINTER :: T_vpot ! virtual potential temperature [K]
692	REAL(wp), DIMENSION(:,:), POINTER :: T_star ! turbulent scale of tem. fluct.
693	REAL(wp), DIMENSION(:,:), POINTER :: q_star ! turbulent humidity of temp. fluct.
694	REAL(wp), DIMENSION(:,:), POINTER :: U_star ! turb. scale of velocity fluct.
695	REAL(wp), DIMENSION(:,:), POINTER :: L ! Monin-Obukov length [m]
696	REAL(wp), DIMENSION(:,:), POINTER :: zeta ! stability parameter at height zu
697	REAL(wp), DIMENSION(:,:), POINTER :: U_n10 ! neutral wind velocity at 10m [m]
698	REAL(wp), DIMENSION(:,:), POINTER :: xlogt, xct, zpsi_h, zpsi_m
699
700	INTEGER , DIMENSION(:,:), POINTER :: stab ! 1st guess stability test integer
701	!!----------------------------------------------------------------------
702	!
703	IF( nn_timing == 1 ) CALL timing_start('TURB_CORE_1Z')
704	!
705	CALL wrk_alloc( jpi,jpj, stab ) ! integer
706	CALL wrk_alloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
707	CALL wrk_alloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta, U_n10, xlogt, xct, zpsi_h, zpsi_m )
708
709	!! * Start
710	!! Air/sea differences
711	dU10 = max(0.5, dU) ! we don't want to fall under 0.5 m/s
712	dT = T_a - sst ! assuming that T_a is allready the potential temp. at zzu
713	dq = q_a - q_sat
714	!!
715	!! Virtual potential temperature
716	T_vpot = T_a(1. + 0.608q_a)
717	!!
718	!! Neutral Drag Coefficient
719	stab = 0.5 + sign(0.5,dT) ! stable : stab = 1 ; unstable : stab = 0
720	IF ( ln_cdgw ) THEN
721	cdn_wave = cdn_wave - rsmall*(tmask(:,:,1)-1)
722	Cd_n10(:,:) = cdn_wave
723	ELSE
724	Cd_n10 = 1E-3 * ( 2.7/dU10 + 0.142 + dU10/13.09 ) ! L & Y eq. (6a)
725	ENDIF
726	sqrt_Cd_n10 = sqrt(Cd_n10)
727	Ce_n10 = 1E-3 * ( 34.6 * sqrt_Cd_n10 ) ! L & Y eq. (6b)
728	Ch_n10 = 1E-3sqrt_Cd_n10(18stab + 32.7(1-stab)) ! L & Y eq. (6c), (6d)
729	!!
730	!! Initializing transfert coefficients with their first guess neutral equivalents :
731	Cd = Cd_n10 ; Ce = Ce_n10 ; Ch = Ch_n10 ; sqrt_Cd = sqrt(Cd)
732
733	!! * Now starting iteration loop
734	DO j_itt=1, nb_itt
735	!! Turbulent scales :
736	U_star = sqrt_Cd*dU10 ! L & Y eq. (7a)
737	T_star = Ch/sqrt_Cd*dT ! L & Y eq. (7b)
738	q_star = Ce/sqrt_Cd*dq ! L & Y eq. (7c)
739
740	!! Estimate the Monin-Obukov length :
741	L = (U_star*2)/( kappagrav*(T_star/T_vpot + q_star/(q_a + 1./0.608)) )
742
743	!! Stability parameters :
744	zeta = zu/L ; zeta = sign( min(abs(zeta),10.0), zeta )
745	zpsi_h = psi_h(zeta)
746	zpsi_m = psi_m(zeta)
747
748	IF ( ln_cdgw ) THEN
749	sqrt_Cd=kappa/((kappa/sqrt_Cd_n10) - zpsi_m) ; Cd=sqrt_Cd*sqrt_Cd;
750	ELSE
751	!! Shifting the wind speed to 10m and neutral stability :
752	U_n10 = dU101./(1. + sqrt_Cd_n10/kappa(log(zu/10.) - zpsi_m)) ! L & Y eq. (9a)
753
754	!! Updating the neutral 10m transfer coefficients :
755	Cd_n10 = 1E-3 * (2.7/U_n10 + 0.142 + U_n10/13.09) ! L & Y eq. (6a)
756	sqrt_Cd_n10 = sqrt(Cd_n10)
757	Ce_n10 = 1E-3 * (34.6 * sqrt_Cd_n10) ! L & Y eq. (6b)
758	stab = 0.5 + sign(0.5,zeta)
759	Ch_n10 = 1E-3sqrt_Cd_n10(18.stab + 32.7(1-stab)) ! L & Y eq. (6c), (6d)
760
761	!! Shifting the neutral 10m transfer coefficients to ( zu , zeta ) :
762	!!
763	xct = 1. + sqrt_Cd_n10/kappa*(log(zu/10) - zpsi_m)
764	Cd = Cd_n10/(xct*xct) ; sqrt_Cd = sqrt(Cd)
765	ENDIF
766	!!
767	xlogt = log(zu/10.) - zpsi_h
768	!!
769	xct = 1. + Ch_n10*xlogt/kappa/sqrt_Cd_n10
770	Ch = Ch_n10*sqrt_Cd/sqrt_Cd_n10/xct
771	!!
772	xct = 1. + Ce_n10*xlogt/kappa/sqrt_Cd_n10
773	Ce = Ce_n10*sqrt_Cd/sqrt_Cd_n10/xct
774	!!
775	END DO
776	!!
777	CALL wrk_dealloc( jpi,jpj, stab ) ! integer
778	CALL wrk_dealloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
779	CALL wrk_dealloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta, U_n10, xlogt, xct, zpsi_h, zpsi_m )
780	!
781	IF( nn_timing == 1 ) CALL timing_stop('TURB_CORE_1Z')
782	!
783	END SUBROUTINE TURB_CORE_1Z
784
785
786	SUBROUTINE TURB_CORE_2Z(zt, zu, sst, T_zt, q_sat, q_zt, dU, Cd, Ch, Ce, T_zu, q_zu)
787	!!----------------------------------------------------------------------
788	!! * ROUTINE turb_core *
789	!!
790	!! ** Purpose : Computes turbulent transfert coefficients of surface
791	!! fluxes according to Large & Yeager (2004).
792	!!
793	!! ** 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
794	!! Momentum, Latent and sensible heat exchange coefficients
795	!! Caution: this procedure should only be used in cases when air
796	!! temperature (T_air) and air specific humidity (q_air) are at 2m
797	!! whereas wind (dU) is at 10m.
798	!!
799	!! References : Large & Yeager, 2004 : ???
800	!!----------------------------------------------------------------------
801	REAL(wp), INTENT(in ) :: zt ! height for T_zt and q_zt [m]
802	REAL(wp), INTENT(in ) :: zu ! height for dU [m]
803	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: sst ! sea surface temperature [Kelvin]
804	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: T_zt ! potential air temperature [Kelvin]
805	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: q_sat ! sea surface specific humidity [kg/kg]
806	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: q_zt ! specific air humidity [kg/kg]
807	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: dU ! relative wind module \|U(zu)-U(0)\| [m/s]
808	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: Cd ! transfer coefficient for momentum (tau)
809	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: Ch ! transfer coefficient for sensible heat (Q_sens)
810	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: Ce ! transfert coefficient for evaporation (Q_lat)
811	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: T_zu ! air temp. shifted at zu [K]
812	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: q_zu ! spec. hum. shifted at zu [kg/kg]
813
814	INTEGER :: j_itt
815	INTEGER , PARAMETER :: nb_itt = 3 ! number of itterations
816	REAL(wp), PARAMETER :: grav = 9.8 ! gravity
817	REAL(wp), PARAMETER :: kappa = 0.4 ! von Karman's constant
818
819	REAL(wp), DIMENSION(:,:), POINTER :: dU10 ! dU [m/s]
820	REAL(wp), DIMENSION(:,:), POINTER :: dT ! air/sea temperature differeence [K]
821	REAL(wp), DIMENSION(:,:), POINTER :: dq ! air/sea humidity difference [K]
822	REAL(wp), DIMENSION(:,:), POINTER :: Cd_n10 ! 10m neutral drag coefficient
823	REAL(wp), DIMENSION(:,:), POINTER :: Ce_n10 ! 10m neutral latent coefficient
824	REAL(wp), DIMENSION(:,:), POINTER :: Ch_n10 ! 10m neutral sensible coefficient
825	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd_n10 ! root square of Cd_n10
826	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd ! root square of Cd
827	REAL(wp), DIMENSION(:,:), POINTER :: T_vpot ! virtual potential temperature [K]
828	REAL(wp), DIMENSION(:,:), POINTER :: T_star ! turbulent scale of tem. fluct.
829	REAL(wp), DIMENSION(:,:), POINTER :: q_star ! turbulent humidity of temp. fluct.
830	REAL(wp), DIMENSION(:,:), POINTER :: U_star ! turb. scale of velocity fluct.
831	REAL(wp), DIMENSION(:,:), POINTER :: L ! Monin-Obukov length [m]
832	REAL(wp), DIMENSION(:,:), POINTER :: zeta_u ! stability parameter at height zu
833	REAL(wp), DIMENSION(:,:), POINTER :: zeta_t ! stability parameter at height zt
834	REAL(wp), DIMENSION(:,:), POINTER :: U_n10 ! neutral wind velocity at 10m [m]
835	REAL(wp), DIMENSION(:,:), POINTER :: xlogt, xct, zpsi_hu, zpsi_ht, zpsi_m
836
837	INTEGER , DIMENSION(:,:), POINTER :: stab ! 1st stability test integer
838	!!----------------------------------------------------------------------
839	!
840	IF( nn_timing == 1 ) CALL timing_start('TURB_CORE_2Z')
841	!
842	CALL wrk_alloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
843	CALL wrk_alloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta_u, zeta_t, U_n10 )
844	CALL wrk_alloc( jpi,jpj, xlogt, xct, zpsi_hu, zpsi_ht, zpsi_m )
845	CALL wrk_alloc( jpi,jpj, stab ) ! interger
846
847	!! Initial air/sea differences
848	dU10 = max(0.5, dU) ! we don't want to fall under 0.5 m/s
849	dT = T_zt - sst
850	dq = q_zt - q_sat
851
852	!! Neutral Drag Coefficient :
853	stab = 0.5 + sign(0.5,dT) ! stab = 1 if dT > 0 -> STABLE
854	IF( ln_cdgw ) THEN
855	cdn_wave = cdn_wave - rsmall*(tmask(:,:,1)-1)
856	Cd_n10(:,:) = cdn_wave
857	ELSE
858	Cd_n10 = 1E-3*( 2.7/dU10 + 0.142 + dU10/13.09 )
859	ENDIF
860	sqrt_Cd_n10 = sqrt(Cd_n10)
861	Ce_n10 = 1E-3( 34.6 sqrt_Cd_n10 )
862	Ch_n10 = 1E-3sqrt_Cd_n10(18stab + 32.7(1 - stab))
863
864	!! Initializing transf. coeff. with their first guess neutral equivalents :
865	Cd = Cd_n10 ; Ce = Ce_n10 ; Ch = Ch_n10 ; sqrt_Cd = sqrt(Cd)
866
867	!! Initializing z_u values with z_t values :
868	T_zu = T_zt ; q_zu = q_zt
869
870	!! * Now starting iteration loop
871	DO j_itt=1, nb_itt
872	dT = T_zu - sst ; dq = q_zu - q_sat ! Updating air/sea differences
873	T_vpot = T_zu(1. + 0.608q_zu) ! Updating virtual potential temperature at zu
874	U_star = sqrt_Cd*dU10 ! Updating turbulent scales : (L & Y eq. (7))
875	T_star = Ch/sqrt_Cd*dT !
876	q_star = Ce/sqrt_Cd*dq !
877	!!
878	L = (U_star*U_star) & ! Estimate the Monin-Obukov length at height zu
879	& / (kappagrav/T_vpot(T_star(1.+0.608q_zu) + 0.608T_zuq_star))
880	!! Stability parameters :
881	zeta_u = zu/L ; zeta_u = sign( min(abs(zeta_u),10.0), zeta_u )
882	zeta_t = zt/L ; zeta_t = sign( min(abs(zeta_t),10.0), zeta_t )
883	zpsi_hu = psi_h(zeta_u)
884	zpsi_ht = psi_h(zeta_t)
885	zpsi_m = psi_m(zeta_u)
886	!!
887	!! Shifting the wind speed to 10m and neutral stability : (L & Y eq.(9a))
888	! U_n10 = dU10/(1. + sqrt_Cd_n10/kappa*(log(zu/10.) - psi_m(zeta_u)))
889	U_n10 = dU10/(1. + sqrt_Cd_n10/kappa*(log(zu/10.) - zpsi_m))
890	!!
891	!! Shifting temperature and humidity at zu : (L & Y eq. (9b-9c))
892	! T_zu = T_zt - T_star/kappa*(log(zt/zu) + psi_h(zeta_u) - psi_h(zeta_t))
893	T_zu = T_zt - T_star/kappa*(log(zt/zu) + zpsi_hu - zpsi_ht)
894	! q_zu = q_zt - q_star/kappa*(log(zt/zu) + psi_h(zeta_u) - psi_h(zeta_t))
895	q_zu = q_zt - q_star/kappa*(log(zt/zu) + zpsi_hu - zpsi_ht)
896	!!
897	!! q_zu cannot have a negative value : forcing 0
898	stab = 0.5 + sign(0.5,q_zu) ; q_zu = stab*q_zu
899	!!
900	IF( ln_cdgw ) THEN
901	sqrt_Cd=kappa/((kappa/sqrt_Cd_n10) - zpsi_m) ; Cd=sqrt_Cd*sqrt_Cd;
902	ELSE
903	!! Updating the neutral 10m transfer coefficients :
904	Cd_n10 = 1E-3 * (2.7/U_n10 + 0.142 + U_n10/13.09) ! L & Y eq. (6a)
905	sqrt_Cd_n10 = sqrt(Cd_n10)
906	Ce_n10 = 1E-3 * (34.6 * sqrt_Cd_n10) ! L & Y eq. (6b)
907	stab = 0.5 + sign(0.5,zeta_u)
908	Ch_n10 = 1E-3sqrt_Cd_n10(18.stab + 32.7(1-stab)) ! L & Y eq. (6c-6d)
909	!!
910	!!
911	!! Shifting the neutral 10m transfer coefficients to (zu,zeta_u) :
912	xct = 1. + sqrt_Cd_n10/kappa*(log(zu/10.) - zpsi_m)
913	Cd = Cd_n10/(xct*xct) ; sqrt_Cd = sqrt(Cd)
914	ENDIF
915	!!
916	xlogt = log(zu/10.) - zpsi_hu
917	!!
918	xct = 1. + Ch_n10*xlogt/kappa/sqrt_Cd_n10
919	Ch = Ch_n10*sqrt_Cd/sqrt_Cd_n10/xct
920	!!
921	xct = 1. + Ce_n10*xlogt/kappa/sqrt_Cd_n10
922	Ce = Ce_n10*sqrt_Cd/sqrt_Cd_n10/xct
923	!!
924	!!
925	END DO
926	!!
927	CALL wrk_dealloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
928	CALL wrk_dealloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta_u, zeta_t, U_n10 )
929	CALL wrk_dealloc( jpi,jpj, xlogt, xct, zpsi_hu, zpsi_ht, zpsi_m )
930	CALL wrk_dealloc( jpi,jpj, stab ) ! interger
931	!
932	IF( nn_timing == 1 ) CALL timing_stop('TURB_CORE_2Z')
933	!
934	END SUBROUTINE TURB_CORE_2Z
935
936
937	FUNCTION psi_m(zta) !! Psis, L & Y eq. (8c), (8d), (8e)
938	!-------------------------------------------------------------------------------
939	REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: zta
940
941	REAL(wp), PARAMETER :: pi = 3.141592653589793_wp
942	REAL(wp), DIMENSION(jpi,jpj) :: psi_m
943	REAL(wp), DIMENSION(:,:), POINTER :: X2, X, stabit
944	!-------------------------------------------------------------------------------
945
946	CALL wrk_alloc( jpi,jpj, X2, X, stabit )
947
948	X2 = sqrt(abs(1. - 16.*zta)) ; X2 = max(X2 , 1.0) ; X = sqrt(X2)
949	stabit = 0.5 + sign(0.5,zta)
950	psi_m = -5.ztastabit & ! Stable
951	& + (1. - stabit)(2log((1. + X)/2) + log((1. + X2)/2) - 2*atan(X) + pi/2) ! Unstable
952
953	CALL wrk_dealloc( jpi,jpj, X2, X, stabit )
954	!
955	END FUNCTION psi_m
956
957
958	FUNCTION psi_h( zta ) !! Psis, L & Y eq. (8c), (8d), (8e)
959	!-------------------------------------------------------------------------------
960	REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: zta
961	!
962	REAL(wp), DIMENSION(jpi,jpj) :: psi_h
963	REAL(wp), DIMENSION(:,:), POINTER :: X2, X, stabit
964	!-------------------------------------------------------------------------------
965
966	CALL wrk_alloc( jpi,jpj, X2, X, stabit )
967
968	X2 = sqrt(abs(1. - 16.*zta)) ; X2 = max(X2 , 1.) ; X = sqrt(X2)
969	stabit = 0.5 + sign(0.5,zta)
970	psi_h = -5.ztastabit & ! Stable
971	& + (1. - stabit)(2.log( (1. + X2)/2. )) ! Unstable
972
973	CALL wrk_dealloc( jpi,jpj, X2, X, stabit )
974	!
975	END FUNCTION psi_h
976
977	!!======================================================================
978	END MODULE sbcblk_core

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