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sbcblk_core.F90 in branches/2012/dev_MERGE_2012/NEMOGCM/NEMO/OPA_SRC/SBC – NEMO

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source: branches/2012/dev_MERGE_2012/NEMOGCM/NEMO/OPA_SRC/SBC/sbcblk_core.F90 @ 3772

Last change on this file since 3772 was 3772, checked in by cbricaud, 11 years ago
add mutliplication by rn_pfac in qns computation for sf(jp_prec)%fnow(:,:,1) and sf(jp_snow)%fnow(:,:,1) ; see ticket 1048
Property svn:keywords set to `Id`
File size: 54.5 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 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	!!
125	CHARACTER(len=100) :: cn_dir ! Root directory for location of core files
126	TYPE(FLD_N), DIMENSION(jpfld) :: slf_i ! array of namelist informations on the fields to read
127	TYPE(FLD_N) :: sn_wndi, sn_wndj, sn_humi, sn_qsr ! informations about the fields to be read
128	TYPE(FLD_N) :: sn_qlw , sn_tair, sn_prec, sn_snow, sn_tdif ! - -
129	NAMELIST/namsbc_core/ cn_dir , ln_2m , ln_taudif, rn_pfac, &
130	& sn_wndi, sn_wndj, sn_humi , sn_qsr , &
131	& sn_qlw , sn_tair, sn_prec , sn_snow, sn_tdif
132	!!---------------------------------------------------------------------
133
134	! ! ====================== !
135	IF( kt == nit000 ) THEN ! First call kt=nit000 !
136	! ! ====================== !
137	! set file information (default values)
138	cn_dir = './' ! directory in which the model is executed
139	!
140	! (NB: frequency positive => hours, negative => months)
141	! ! file ! frequency ! variable ! time intep ! clim ! 'yearly' or ! weights ! rotation !
142	! ! name ! (hours) ! name ! (T/F) ! (T/F) ! 'monthly' ! filename ! pairs !
143	sn_wndi = FLD_N( 'uwnd10m', 24 , 'u_10' , .false. , .false. , 'yearly' , '' , '' )
144	sn_wndj = FLD_N( 'vwnd10m', 24 , 'v_10' , .false. , .false. , 'yearly' , '' , '' )
145	sn_qsr = FLD_N( 'qsw' , 24 , 'qsw' , .false. , .false. , 'yearly' , '' , '' )
146	sn_qlw = FLD_N( 'qlw' , 24 , 'qlw' , .false. , .false. , 'yearly' , '' , '' )
147	sn_tair = FLD_N( 'tair10m', 24 , 't_10' , .false. , .false. , 'yearly' , '' , '' )
148	sn_humi = FLD_N( 'humi10m', 24 , 'q_10' , .false. , .false. , 'yearly' , '' , '' )
149	sn_prec = FLD_N( 'precip' , -1 , 'precip' , .true. , .false. , 'yearly' , '' , '' )
150	sn_snow = FLD_N( 'snow' , -1 , 'snow' , .true. , .false. , 'yearly' , '' , '' )
151	sn_tdif = FLD_N( 'taudif' , 24 , 'taudif' , .true. , .false. , 'yearly' , '' , '' )
152	!
153	REWIND( numnam ) ! read in namlist namsbc_core
154	READ ( numnam, namsbc_core )
155	! ! check: do we plan to use ln_dm2dc with non-daily forcing?
156	IF( ln_dm2dc .AND. sn_qsr%nfreqh /= 24 ) &
157	& CALL ctl_stop( 'sbc_blk_core: ln_dm2dc can be activated only with daily short-wave forcing' )
158	IF( ln_dm2dc .AND. sn_qsr%ln_tint ) THEN
159	CALL ctl_warn( 'sbc_blk_core: ln_dm2dc is taking care of the temporal interpolation of daily qsr', &
160	& ' ==> We force time interpolation = .false. for qsr' )
161	sn_qsr%ln_tint = .false.
162	ENDIF
163	! ! store namelist information in an array
164	slf_i(jp_wndi) = sn_wndi ; slf_i(jp_wndj) = sn_wndj
165	slf_i(jp_qsr ) = sn_qsr ; slf_i(jp_qlw ) = sn_qlw
166	slf_i(jp_tair) = sn_tair ; slf_i(jp_humi) = sn_humi
167	slf_i(jp_prec) = sn_prec ; slf_i(jp_snow) = sn_snow
168	slf_i(jp_tdif) = sn_tdif
169	!
170	lhftau = ln_taudif ! do we use HF tau information?
171	jfld = jpfld - COUNT( (/.NOT. lhftau/) )
172	!
173	ALLOCATE( sf(jfld), STAT=ierror ) ! set sf structure
174	IF( ierror > 0 ) CALL ctl_stop( 'STOP', 'sbc_blk_core: unable to allocate sf structure' )
175	DO ifpr= 1, jfld
176	ALLOCATE( sf(ifpr)%fnow(jpi,jpj,1) )
177	IF( slf_i(ifpr)%ln_tint ) ALLOCATE( sf(ifpr)%fdta(jpi,jpj,1,2) )
178	END DO
179	! ! fill sf with slf_i and control print
180	CALL fld_fill( sf, slf_i, cn_dir, 'sbc_blk_core', 'flux formulation for ocean surface boundary condition', 'namsbc_core' )
181	!
182	sfx(:,:) = 0._wp ! salt flux; zero unless ice is present (computed in limsbc(_2).F90)
183	!
184	ENDIF
185
186	CALL fld_read( kt, nn_fsbc, sf ) ! input fields provided at the current time-step
187
188	! ! compute the surface ocean fluxes using CORE bulk formulea
189	IF( MOD( kt - 1, nn_fsbc ) == 0 ) CALL blk_oce_core( kt, sf, sst_m, ssu_m, ssv_m )
190
191	#if defined key_cice
192	IF( MOD( kt - 1, nn_fsbc ) == 0 ) THEN
193	qlw_ice(:,:,1) = sf(jp_qlw)%fnow(:,:,1)
194	qsr_ice(:,:,1) = sf(jp_qsr)%fnow(:,:,1)
195	tatm_ice(:,:) = sf(jp_tair)%fnow(:,:,1)
196	qatm_ice(:,:) = sf(jp_humi)%fnow(:,:,1)
197	tprecip(:,:) = sf(jp_prec)%fnow(:,:,1) * rn_pfac
198	sprecip(:,:) = sf(jp_snow)%fnow(:,:,1) * rn_pfac
199	wndi_ice(:,:) = sf(jp_wndi)%fnow(:,:,1)
200	wndj_ice(:,:) = sf(jp_wndj)%fnow(:,:,1)
201	ENDIF
202	#endif
203	!
204	END SUBROUTINE sbc_blk_core
205
206
207	SUBROUTINE blk_oce_core( kt, sf, pst, pu, pv )
208	!!---------------------------------------------------------------------
209	!! * ROUTINE blk_core *
210	!!
211	!! ** Purpose : provide the momentum, heat and freshwater fluxes at
212	!! the ocean surface at each time step
213	!!
214	!! ** Method : CORE bulk formulea for the ocean using atmospheric
215	!! fields read in sbc_read
216	!!
217	!! ** Outputs : - utau : i-component of the stress at U-point (N/m2)
218	!! - vtau : j-component of the stress at V-point (N/m2)
219	!! - taum : Wind stress module at T-point (N/m2)
220	!! - wndm : Wind speed module at T-point (m/s)
221	!! - qsr : Solar heat flux over the ocean (W/m2)
222	!! - qns : Non Solar heat flux over the ocean (W/m2)
223	!! - evap : Evaporation over the ocean (kg/m2/s)
224	!! - emp : evaporation minus precipitation (kg/m2/s)
225	!!
226	!! ** Nota : sf has to be a dummy argument for AGRIF on NEC
227	!!---------------------------------------------------------------------
228	INTEGER , INTENT(in ) :: kt ! time step index
229	TYPE(fld), INTENT(inout), DIMENSION(:) :: sf ! input data
230	REAL(wp) , INTENT(in) , DIMENSION(:,:) :: pst ! surface temperature [Celcius]
231	REAL(wp) , INTENT(in) , DIMENSION(:,:) :: pu ! surface current at U-point (i-component) [m/s]
232	REAL(wp) , INTENT(in) , DIMENSION(:,:) :: pv ! surface current at V-point (j-component) [m/s]
233	!
234	INTEGER :: ji, jj ! dummy loop indices
235	REAL(wp) :: zcoef_qsatw, zztmp ! local variable
236	REAL(wp), DIMENSION(:,:), POINTER :: zwnd_i, zwnd_j ! wind speed components at T-point
237	REAL(wp), DIMENSION(:,:), POINTER :: zqsatw ! specific humidity at pst
238	REAL(wp), DIMENSION(:,:), POINTER :: zqlw, zqsb ! long wave and sensible heat fluxes
239	REAL(wp), DIMENSION(:,:), POINTER :: zqla, zevap ! latent heat fluxes and evaporation
240	REAL(wp), DIMENSION(:,:), POINTER :: Cd ! transfer coefficient for momentum (tau)
241	REAL(wp), DIMENSION(:,:), POINTER :: Ch ! transfer coefficient for sensible heat (Q_sens)
242	REAL(wp), DIMENSION(:,:), POINTER :: Ce ! tansfert coefficient for evaporation (Q_lat)
243	REAL(wp), DIMENSION(:,:), POINTER :: zst ! surface temperature in Kelvin
244	REAL(wp), DIMENSION(:,:), POINTER :: zt_zu ! air temperature at wind speed height
245	REAL(wp), DIMENSION(:,:), POINTER :: zq_zu ! air spec. hum. at wind speed height
246	!!---------------------------------------------------------------------
247	!
248	IF( nn_timing == 1 ) CALL timing_start('blk_oce_core')
249	!
250	CALL wrk_alloc( jpi,jpj, zwnd_i, zwnd_j, zqsatw, zqlw, zqsb, zqla, zevap )
251	CALL wrk_alloc( jpi,jpj, Cd, Ch, Ce, zst, zt_zu, zq_zu )
252	!
253	! local scalars ( place there for vector optimisation purposes)
254	zcoef_qsatw = 0.98 * 640380. / rhoa
255
256	zst(:,:) = pst(:,:) + rt0 ! convert SST from Celcius to Kelvin (and set minimum value far above 0 K)
257
258	! ----------------------------------------------------------------------------- !
259	! 0 Wind components and module at T-point relative to the moving ocean !
260	! ----------------------------------------------------------------------------- !
261
262	! ... components ( U10m - U_oce ) at T-point (unmasked)
263	zwnd_i(:,:) = 0.e0
264	zwnd_j(:,:) = 0.e0
265	#if defined key_cyclone
266	# if defined key_vectopt_loop
267	!CDIR COLLAPSE
268	# endif
269	CALL wnd_cyc( kt, zwnd_i, zwnd_j ) ! add Manu !
270	DO jj = 2, jpjm1
271	DO ji = fs_2, fs_jpim1 ! vect. opt.
272	sf(jp_wndi)%fnow(ji,jj,1) = sf(jp_wndi)%fnow(ji,jj,1) + zwnd_i(ji,jj)
273	sf(jp_wndj)%fnow(ji,jj,1) = sf(jp_wndj)%fnow(ji,jj,1) + zwnd_j(ji,jj)
274	END DO
275	END DO
276	#endif
277	#if defined key_vectopt_loop
278	!CDIR COLLAPSE
279	#endif
280	DO jj = 2, jpjm1
281	DO ji = fs_2, fs_jpim1 ! vect. opt.
282	zwnd_i(ji,jj) = ( sf(jp_wndi)%fnow(ji,jj,1) - 0.5 * ( pu(ji-1,jj ) + pu(ji,jj) ) )
283	zwnd_j(ji,jj) = ( sf(jp_wndj)%fnow(ji,jj,1) - 0.5 * ( pv(ji ,jj-1) + pv(ji,jj) ) )
284	END DO
285	END DO
286	CALL lbc_lnk( zwnd_i(:,:) , 'T', -1. )
287	CALL lbc_lnk( zwnd_j(:,:) , 'T', -1. )
288	! ... scalar wind ( = \| U10m - U_oce \| ) at T-point (masked)
289	!CDIR NOVERRCHK
290	!CDIR COLLAPSE
291	wndm(:,:) = SQRT( zwnd_i(:,:) * zwnd_i(:,:) &
292	& + zwnd_j(:,:) * zwnd_j(:,:) ) * tmask(:,:,1)
293
294	! ----------------------------------------------------------------------------- !
295	! I Radiative FLUXES !
296	! ----------------------------------------------------------------------------- !
297
298	! ocean albedo assumed to be constant + modify now Qsr to include the diurnal cycle ! Short Wave
299	zztmp = 1. - albo
300	IF( ln_dm2dc ) THEN ; qsr(:,:) = zztmp * sbc_dcy( sf(jp_qsr)%fnow(:,:,1) ) * tmask(:,:,1)
301	ELSE ; qsr(:,:) = zztmp * sf(jp_qsr)%fnow(:,:,1) * tmask(:,:,1)
302	ENDIF
303	!CDIR COLLAPSE
304	zqlw(:,:) = ( sf(jp_qlw)%fnow(:,:,1) - Stef * zst(:,:)zst(:,:)zst(:,:)zst(:,:) ) tmask(:,:,1) ! Long Wave
305	! ----------------------------------------------------------------------------- !
306	! II Turbulent FLUXES !
307	! ----------------------------------------------------------------------------- !
308
309	! ... specific humidity at SST and IST
310	!CDIR NOVERRCHK
311	!CDIR COLLAPSE
312	zqsatw(:,:) = zcoef_qsatw * EXP( -5107.4 / zst(:,:) )
313
314	! ... NCAR Bulk formulae, computation of Cd, Ch, Ce at T-point :
315	IF( ln_2m ) THEN
316	!! If air temp. and spec. hum. are given at different height (2m) than wind (10m) :
317	CALL TURB_CORE_2Z(2.,10., zst , sf(jp_tair)%fnow, &
318	& zqsatw, sf(jp_humi)%fnow, wndm, &
319	& Cd , Ch , Ce , &
320	& zt_zu , zq_zu )
321	ELSE
322	!! If air temp. and spec. hum. are given at same height than wind (10m) :
323	!gm bug? at the compiling phase, add a copy in temporary arrays... ==> check perf
324	! CALL TURB_CORE_1Z( 10., zst (:,:), sf(jp_tair)%fnow(:,:), &
325	! & zqsatw(:,:), sf(jp_humi)%fnow(:,:), wndm(:,:), &
326	! & Cd (:,:), Ch (:,:), Ce (:,:) )
327	!gm bug
328	! ARPDBG - this won't compile with gfortran. Fix but check performance
329	! as per comment above.
330	CALL TURB_CORE_1Z( 10., zst , sf(jp_tair)%fnow(:,:,1), &
331	& zqsatw, sf(jp_humi)%fnow(:,:,1), wndm, &
332	& Cd , Ch , Ce )
333	ENDIF
334
335	! ... tau module, i and j component
336	DO jj = 1, jpj
337	DO ji = 1, jpi
338	zztmp = rhoa * wndm(ji,jj) * Cd(ji,jj)
339	taum (ji,jj) = zztmp * wndm (ji,jj)
340	zwnd_i(ji,jj) = zztmp * zwnd_i(ji,jj)
341	zwnd_j(ji,jj) = zztmp * zwnd_j(ji,jj)
342	END DO
343	END DO
344
345	! ... add the HF tau contribution to the wind stress module?
346	IF( lhftau ) THEN
347	!CDIR COLLAPSE
348	taum(:,:) = taum(:,:) + sf(jp_tdif)%fnow(:,:,1)
349	ENDIF
350	CALL iom_put( "taum_oce", taum ) ! output wind stress module
351
352	! ... utau, vtau at U- and V_points, resp.
353	! Note the use of 0.5*(2-umask) in order to unmask the stress along coastlines
354	DO jj = 1, jpjm1
355	DO ji = 1, fs_jpim1
356	utau(ji,jj) = 0.5 * ( 2. - umask(ji,jj,1) ) * ( zwnd_i(ji,jj) + zwnd_i(ji+1,jj ) )
357	vtau(ji,jj) = 0.5 * ( 2. - vmask(ji,jj,1) ) * ( zwnd_j(ji,jj) + zwnd_j(ji ,jj+1) )
358	END DO
359	END DO
360	CALL lbc_lnk( utau(:,:), 'U', -1. )
361	CALL lbc_lnk( vtau(:,:), 'V', -1. )
362
363	! Turbulent fluxes over ocean
364	! -----------------------------
365	IF( ln_2m ) THEN
366	! Values of temp. and hum. adjusted to 10m must be used instead of 2m values
367	zevap(:,:) = MAX( 0.e0, rhoa Ce(:,:)( zqsatw(:,:) - zq_zu(:,:) ) * wndm(:,:) ) ! Evaporation
368	zqsb (:,:) = rhoacpaCh(:,:)( zst (:,:) - zt_zu(:,:) ) wndm(:,:) ! Sensible Heat
369	ELSE
370	!CDIR COLLAPSE
371	zevap(:,:) = MAX( 0.e0, rhoa Ce(:,:)( zqsatw(:,:) - sf(jp_humi)%fnow(:,:,1) ) * wndm(:,:) ) ! Evaporation
372	!CDIR COLLAPSE
373	zqsb (:,:) = rhoacpaCh(:,:)( zst (:,:) - sf(jp_tair)%fnow(:,:,1) ) wndm(:,:) ! Sensible Heat
374	ENDIF
375	!CDIR COLLAPSE
376	zqla (:,:) = Lv * zevap(:,:) ! Latent Heat
377
378	IF(ln_ctl) THEN
379	CALL prt_ctl( tab2d_1=zqla , clinfo1=' blk_oce_core: zqla : ', tab2d_2=Ce , clinfo2=' Ce : ' )
380	CALL prt_ctl( tab2d_1=zqsb , clinfo1=' blk_oce_core: zqsb : ', tab2d_2=Ch , clinfo2=' Ch : ' )
381	CALL prt_ctl( tab2d_1=zqlw , clinfo1=' blk_oce_core: zqlw : ', tab2d_2=qsr, clinfo2=' qsr : ' )
382	CALL prt_ctl( tab2d_1=zqsatw, clinfo1=' blk_oce_core: zqsatw : ', tab2d_2=zst, clinfo2=' zst : ' )
383	CALL prt_ctl( tab2d_1=utau , clinfo1=' blk_oce_core: utau : ', mask1=umask, &
384	& tab2d_2=vtau , clinfo2= ' vtau : ' , mask2=vmask )
385	CALL prt_ctl( tab2d_1=wndm , clinfo1=' blk_oce_core: wndm : ')
386	CALL prt_ctl( tab2d_1=zst , clinfo1=' blk_oce_core: zst : ')
387	ENDIF
388
389	! ----------------------------------------------------------------------------- !
390	! III Total FLUXES !
391	! ----------------------------------------------------------------------------- !
392
393	!CDIR COLLAPSE
394	emp (:,:) = ( zevap(:,:) & ! mass flux (evap. - precip.)
395	& - sf(jp_prec)%fnow(:,:,1) * rn_pfac ) * tmask(:,:,1)
396	!CDIR COLLAPSE
397	qns(:,:) = zqlw(:,:) - zqsb(:,:) - zqla(:,:) & ! Downward Non Solar flux
398	& - sf(jp_snow)%fnow(:,:,1) * rn_pfac * lfus & ! remove latent melting heat for solid precip
399	& - zevap(:,:) * pst(:,:) * rcp & ! remove evap heat content at SST
400	& + ( sf(jp_prec)%fnow(:,:,1) - sf(jp_snow)%fnow(:,:,1) ) * rn_pfac & ! add liquid precip heat content at Tair
401	& * ( sf(jp_tair)%fnow(:,:,1) - rt0 ) * rcp &
402	& + sf(jp_snow)%fnow(:,:,1) * rn_pfac & ! add solid precip heat content at min(Tair,Tsnow)
403	& * ( MIN( sf(jp_tair)%fnow(:,:,1), rt0_snow ) - rt0 ) * cpic
404	!
405	CALL iom_put( "qlw_oce", zqlw ) ! output downward longwave heat over the ocean
406	CALL iom_put( "qsb_oce", - zqsb ) ! output downward sensible heat over the ocean
407	CALL iom_put( "qla_oce", - zqla ) ! output downward latent heat over the ocean
408	CALL iom_put( "qhc_oce", qns-zqlw+zqsb+zqla ) ! output downward heat content of E-P over the ocean
409	CALL iom_put( "qns_oce", qns ) ! output downward non solar heat over the ocean
410	!
411	IF(ln_ctl) THEN
412	CALL prt_ctl(tab2d_1=zqsb , clinfo1=' blk_oce_core: zqsb : ', tab2d_2=zqlw , clinfo2=' zqlw : ')
413	CALL prt_ctl(tab2d_1=zqla , clinfo1=' blk_oce_core: zqla : ', tab2d_2=qsr , clinfo2=' qsr : ')
414	CALL prt_ctl(tab2d_1=pst , clinfo1=' blk_oce_core: pst : ', tab2d_2=emp , clinfo2=' emp : ')
415	CALL prt_ctl(tab2d_1=utau , clinfo1=' blk_oce_core: utau : ', mask1=umask, &
416	& tab2d_2=vtau , clinfo2= ' vtau : ' , mask2=vmask )
417	ENDIF
418	!
419	CALL wrk_dealloc( jpi,jpj, zwnd_i, zwnd_j, zqsatw, zqlw, zqsb, zqla, zevap )
420	CALL wrk_dealloc( jpi,jpj, Cd, Ch, Ce, zst, zt_zu, zq_zu )
421	!
422	IF( nn_timing == 1 ) CALL timing_stop('blk_oce_core')
423	!
424	END SUBROUTINE blk_oce_core
425
426
427	SUBROUTINE blk_ice_core( pst , pui , pvi , palb , &
428	& p_taui, p_tauj, p_qns , p_qsr, &
429	& p_qla , p_dqns, p_dqla, &
430	& p_tpr , p_spr , &
431	& p_fr1 , p_fr2 , cd_grid, pdim )
432	!!---------------------------------------------------------------------
433	!! * ROUTINE blk_ice_core *
434	!!
435	!! ** Purpose : provide the surface boundary condition over sea-ice
436	!!
437	!! ** Method : compute momentum, heat and freshwater exchanged
438	!! between atmosphere and sea-ice using CORE bulk
439	!! formulea, ice variables and read atmmospheric fields.
440	!! NB: ice drag coefficient is assumed to be a constant
441	!!
442	!! caution : the net upward water flux has with mm/day unit
443	!!---------------------------------------------------------------------
444	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: pst ! ice surface temperature (>0, =rt0 over land) [Kelvin]
445	REAL(wp), DIMENSION(:,:) , INTENT(in ) :: pui ! ice surface velocity (i- and i- components [m/s]
446	REAL(wp), DIMENSION(:,:) , INTENT(in ) :: pvi ! at I-point (B-grid) or U & V-point (C-grid)
447	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: palb ! ice albedo (clear sky) (alb_ice_cs) [%]
448	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_taui ! i- & j-components of surface ice stress [N/m2]
449	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_tauj ! at I-point (B-grid) or U & V-point (C-grid)
450	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qns ! non solar heat flux over ice (T-point) [W/m2]
451	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qsr ! solar heat flux over ice (T-point) [W/m2]
452	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qla ! latent heat flux over ice (T-point) [W/m2]
453	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_dqns ! non solar heat sensistivity (T-point) [W/m2]
454	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_dqla ! latent heat sensistivity (T-point) [W/m2]
455	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_tpr ! total precipitation (T-point) [Kg/m2/s]
456	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_spr ! solid precipitation (T-point) [Kg/m2/s]
457	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_fr1 ! 1sr fraction of qsr penetration in ice (T-point) [%]
458	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_fr2 ! 2nd fraction of qsr penetration in ice (T-point) [%]
459	CHARACTER(len=1) , INTENT(in ) :: cd_grid ! ice grid ( C or B-grid)
460	INTEGER , INTENT(in ) :: pdim ! number of ice categories
461	!!
462	INTEGER :: ji, jj, jl ! dummy loop indices
463	INTEGER :: ijpl ! number of ice categories (size of 3rd dim of input arrays)
464	REAL(wp) :: zst2, zst3
465	REAL(wp) :: zcoef_wnorm, zcoef_wnorm2, zcoef_dqlw, zcoef_dqla, zcoef_dqsb
466	REAL(wp) :: zztmp ! temporary variable
467	REAL(wp) :: zcoef_frca ! fractional cloud amount
468	REAL(wp) :: zwnorm_f, zwndi_f , zwndj_f ! relative wind module and components at F-point
469	REAL(wp) :: zwndi_t , zwndj_t ! relative wind components at T-point
470	!!
471	REAL(wp), DIMENSION(:,:) , POINTER :: z_wnds_t ! wind speed ( = \| U10m - U_ice \| ) at T-point
472	REAL(wp), DIMENSION(:,:,:), POINTER :: z_qlw ! long wave heat flux over ice
473	REAL(wp), DIMENSION(:,:,:), POINTER :: z_qsb ! sensible heat flux over ice
474	REAL(wp), DIMENSION(:,:,:), POINTER :: z_dqlw ! long wave heat sensitivity over ice
475	REAL(wp), DIMENSION(:,:,:), POINTER :: z_dqsb ! sensible heat sensitivity over ice
476	!!---------------------------------------------------------------------
477	!
478	IF( nn_timing == 1 ) CALL timing_start('blk_ice_core')
479	!
480	CALL wrk_alloc( jpi,jpj, z_wnds_t )
481	CALL wrk_alloc( jpi,jpj,pdim, z_qlw, z_qsb, z_dqlw, z_dqsb )
482
483	ijpl = pdim ! number of ice categories
484
485	! local scalars ( place there for vector optimisation purposes)
486	zcoef_wnorm = rhoa * Cice
487	zcoef_wnorm2 = rhoa * Cice * 0.5
488	zcoef_dqlw = 4.0 * 0.95 * Stef
489	zcoef_dqla = -Ls * Cice * 11637800. * (-5897.8)
490	zcoef_dqsb = rhoa * cpa * Cice
491	zcoef_frca = 1.0 - 0.3
492
493	!!gm brutal....
494	z_wnds_t(:,:) = 0.e0
495	p_taui (:,:) = 0.e0
496	p_tauj (:,:) = 0.e0
497	!!gm end
498
499	#if defined key_lim3
500	tatm_ice(:,:) = sf(jp_tair)%fnow(:,:,1) ! LIM3: make Tair available in sea-ice. WARNING allocated after call to ice_init
501	#endif
502	! ----------------------------------------------------------------------------- !
503	! Wind components and module relative to the moving ocean ( U10m - U_ice ) !
504	! ----------------------------------------------------------------------------- !
505	SELECT CASE( cd_grid )
506	CASE( 'I' ) ! B-grid ice dynamics : I-point (i.e. F-point with sea-ice indexation)
507	! and scalar wind at T-point ( = \| U10m - U_ice \| ) (masked)
508	!CDIR NOVERRCHK
509	DO jj = 2, jpjm1
510	DO ji = 2, jpim1 ! B grid : NO vector opt
511	! ... scalar wind at I-point (fld being at T-point)
512	zwndi_f = 0.25 * ( sf(jp_wndi)%fnow(ji-1,jj ,1) + sf(jp_wndi)%fnow(ji ,jj ,1) &
513	& + sf(jp_wndi)%fnow(ji-1,jj-1,1) + sf(jp_wndi)%fnow(ji ,jj-1,1) ) - pui(ji,jj)
514	zwndj_f = 0.25 * ( sf(jp_wndj)%fnow(ji-1,jj ,1) + sf(jp_wndj)%fnow(ji ,jj ,1) &
515	& + sf(jp_wndj)%fnow(ji-1,jj-1,1) + sf(jp_wndj)%fnow(ji ,jj-1,1) ) - pvi(ji,jj)
516	zwnorm_f = zcoef_wnorm * SQRT( zwndi_f * zwndi_f + zwndj_f * zwndj_f )
517	! ... ice stress at I-point
518	p_taui(ji,jj) = zwnorm_f * zwndi_f
519	p_tauj(ji,jj) = zwnorm_f * zwndj_f
520	! ... scalar wind at T-point (fld being at T-point)
521	zwndi_t = sf(jp_wndi)%fnow(ji,jj,1) - 0.25 * ( pui(ji,jj+1) + pui(ji+1,jj+1) &
522	& + pui(ji,jj ) + pui(ji+1,jj ) )
523	zwndj_t = sf(jp_wndj)%fnow(ji,jj,1) - 0.25 * ( pvi(ji,jj+1) + pvi(ji+1,jj+1) &
524	& + pvi(ji,jj ) + pvi(ji+1,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	CALL lbc_lnk( p_taui , 'I', -1. )
529	CALL lbc_lnk( p_tauj , 'I', -1. )
530	CALL lbc_lnk( z_wnds_t, 'T', 1. )
531	!
532	CASE( 'C' ) ! C-grid ice dynamics : U & V-points (same as ocean)
533	#if defined key_vectopt_loop
534	!CDIR COLLAPSE
535	#endif
536	DO jj = 2, jpj
537	DO ji = fs_2, jpi ! vect. opt.
538	zwndi_t = ( sf(jp_wndi)%fnow(ji,jj,1) - 0.5 * ( pui(ji-1,jj ) + pui(ji,jj) ) )
539	zwndj_t = ( sf(jp_wndj)%fnow(ji,jj,1) - 0.5 * ( pvi(ji ,jj-1) + pvi(ji,jj) ) )
540	z_wnds_t(ji,jj) = SQRT( zwndi_t * zwndi_t + zwndj_t * zwndj_t ) * tmask(ji,jj,1)
541	END DO
542	END DO
543	#if defined key_vectopt_loop
544	!CDIR COLLAPSE
545	#endif
546	DO jj = 2, jpjm1
547	DO ji = fs_2, fs_jpim1 ! vect. opt.
548	p_taui(ji,jj) = zcoef_wnorm2 * ( z_wnds_t(ji+1,jj ) + z_wnds_t(ji,jj) ) &
549	& * ( 0.5 * (sf(jp_wndi)%fnow(ji+1,jj,1) + sf(jp_wndi)%fnow(ji,jj,1) ) - pui(ji,jj) )
550	p_tauj(ji,jj) = zcoef_wnorm2 * ( z_wnds_t(ji,jj+1 ) + z_wnds_t(ji,jj) ) &
551	& * ( 0.5 * (sf(jp_wndj)%fnow(ji,jj+1,1) + sf(jp_wndj)%fnow(ji,jj,1) ) - pvi(ji,jj) )
552	END DO
553	END DO
554	CALL lbc_lnk( p_taui , 'U', -1. )
555	CALL lbc_lnk( p_tauj , 'V', -1. )
556	CALL lbc_lnk( z_wnds_t, 'T', 1. )
557	!
558	END SELECT
559
560	zztmp = 1. / ( 1. - albo )
561	! ! ========================== !
562	DO jl = 1, ijpl ! Loop over ice categories !
563	! ! ========================== !
564	!CDIR NOVERRCHK
565	!CDIR COLLAPSE
566	DO jj = 1 , jpj
567	!CDIR NOVERRCHK
568	DO ji = 1, jpi
569	! ----------------------------!
570	! I Radiative FLUXES !
571	! ----------------------------!
572	zst2 = pst(ji,jj,jl) * pst(ji,jj,jl)
573	zst3 = pst(ji,jj,jl) * zst2
574	! Short Wave (sw)
575	p_qsr(ji,jj,jl) = zztmp * ( 1. - palb(ji,jj,jl) ) * qsr(ji,jj)
576	! Long Wave (lw)
577	z_qlw(ji,jj,jl) = 0.95 * ( sf(jp_qlw)%fnow(ji,jj,1) - Stef * pst(ji,jj,jl) * zst3 ) * tmask(ji,jj,1)
578	! lw sensitivity
579	z_dqlw(ji,jj,jl) = zcoef_dqlw * zst3
580
581	! ----------------------------!
582	! II Turbulent FLUXES !
583	! ----------------------------!
584
585	! ... turbulent heat fluxes
586	! Sensible Heat
587	z_qsb(ji,jj,jl) = rhoa * cpa * Cice * z_wnds_t(ji,jj) * ( pst(ji,jj,jl) - sf(jp_tair)%fnow(ji,jj,1) )
588	! Latent Heat
589	p_qla(ji,jj,jl) = MAX( 0.e0, rhoa * Ls * Cice * z_wnds_t(ji,jj) &
590	& * ( 11637800. * EXP( -5897.8 / pst(ji,jj,jl) ) / rhoa - sf(jp_humi)%fnow(ji,jj,1) ) )
591	! Latent heat sensitivity for ice (Dqla/Dt)
592	p_dqla(ji,jj,jl) = zcoef_dqla * z_wnds_t(ji,jj) / ( zst2 ) * EXP( -5897.8 / pst(ji,jj,jl) )
593	! Sensible heat sensitivity (Dqsb_ice/Dtn_ice)
594	z_dqsb(ji,jj,jl) = zcoef_dqsb * z_wnds_t(ji,jj)
595
596	! ----------------------------!
597	! III Total FLUXES !
598	! ----------------------------!
599	! Downward Non Solar flux
600	p_qns (ji,jj,jl) = z_qlw (ji,jj,jl) - z_qsb (ji,jj,jl) - p_qla (ji,jj,jl)
601	! Total non solar heat flux sensitivity for ice
602	p_dqns(ji,jj,jl) = - ( z_dqlw(ji,jj,jl) + z_dqsb(ji,jj,jl) + p_dqla(ji,jj,jl) )
603	END DO
604	!
605	END DO
606	!
607	END DO
608	!
609	!--------------------------------------------------------------------
610	! FRACTIONs of net shortwave radiation which is not absorbed in the
611	! thin surface layer and penetrates inside the ice cover
612	! ( Maykut and Untersteiner, 1971 ; Ebert and Curry, 1993 )
613
614	!CDIR COLLAPSE
615	p_fr1(:,:) = ( 0.18 * ( 1.0 - zcoef_frca ) + 0.35 * zcoef_frca )
616	!CDIR COLLAPSE
617	p_fr2(:,:) = ( 0.82 * ( 1.0 - zcoef_frca ) + 0.65 * zcoef_frca )
618
619	!CDIR COLLAPSE
620	p_tpr(:,:) = sf(jp_prec)%fnow(:,:,1) * rn_pfac ! total precipitation [kg/m2/s]
621	!CDIR COLLAPSE
622	p_spr(:,:) = sf(jp_snow)%fnow(:,:,1) * rn_pfac ! solid precipitation [kg/m2/s]
623	CALL iom_put( 'snowpre', p_spr ) ! Snow precipitation
624	!
625	IF(ln_ctl) THEN
626	CALL prt_ctl(tab3d_1=p_qla , clinfo1=' blk_ice_core: p_qla : ', tab3d_2=z_qsb , clinfo2=' z_qsb : ', kdim=ijpl)
627	CALL prt_ctl(tab3d_1=z_qlw , clinfo1=' blk_ice_core: z_qlw : ', tab3d_2=p_dqla , clinfo2=' p_dqla : ', kdim=ijpl)
628	CALL prt_ctl(tab3d_1=z_dqsb , clinfo1=' blk_ice_core: z_dqsb : ', tab3d_2=z_dqlw , clinfo2=' z_dqlw : ', kdim=ijpl)
629	CALL prt_ctl(tab3d_1=p_dqns , clinfo1=' blk_ice_core: p_dqns : ', tab3d_2=p_qsr , clinfo2=' p_qsr : ', kdim=ijpl)
630	CALL prt_ctl(tab3d_1=pst , clinfo1=' blk_ice_core: pst : ', tab3d_2=p_qns , clinfo2=' p_qns : ', kdim=ijpl)
631	CALL prt_ctl(tab2d_1=p_tpr , clinfo1=' blk_ice_core: p_tpr : ', tab2d_2=p_spr , clinfo2=' p_spr : ')
632	CALL prt_ctl(tab2d_1=p_taui , clinfo1=' blk_ice_core: p_taui : ', tab2d_2=p_tauj , clinfo2=' p_tauj : ')
633	CALL prt_ctl(tab2d_1=z_wnds_t, clinfo1=' blk_ice_core: z_wnds_t : ')
634	ENDIF
635
636	CALL wrk_dealloc( jpi,jpj, z_wnds_t )
637	CALL wrk_dealloc( jpi,jpj,pdim, z_qlw, z_qsb, z_dqlw, z_dqsb )
638	!
639	IF( nn_timing == 1 ) CALL timing_stop('blk_ice_core')
640	!
641	END SUBROUTINE blk_ice_core
642
643
644	SUBROUTINE TURB_CORE_1Z(zu, sst, T_a, q_sat, q_a, &
645	& dU , Cd , Ch , Ce )
646	!!----------------------------------------------------------------------
647	!! * ROUTINE turb_core *
648	!!
649	!! ** Purpose : Computes turbulent transfert coefficients of surface
650	!! fluxes according to Large & Yeager (2004)
651	!!
652	!! ** 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
653	!! Momentum, Latent and sensible heat exchange coefficients
654	!! Caution: this procedure should only be used in cases when air
655	!! temperature (T_air), air specific humidity (q_air) and wind (dU)
656	!! are provided at the same height 'zzu'!
657	!!
658	!! References : Large & Yeager, 2004 : ???
659	!!----------------------------------------------------------------------
660	REAL(wp) , INTENT(in ) :: zu ! altitude of wind measurement [m]
661	REAL(wp), DIMENSION(:,:), INTENT(in ) :: sst ! sea surface temperature [Kelvin]
662	REAL(wp), DIMENSION(:,:), INTENT(in ) :: T_a ! potential air temperature [Kelvin]
663	REAL(wp), DIMENSION(:,:), INTENT(in ) :: q_sat ! sea surface specific humidity [kg/kg]
664	REAL(wp), DIMENSION(:,:), INTENT(in ) :: q_a ! specific air humidity [kg/kg]
665	REAL(wp), DIMENSION(:,:), INTENT(in ) :: dU ! wind module \|U(zu)-U(0)\| [m/s]
666	REAL(wp), DIMENSION(:,:), INTENT( out) :: Cd ! transfert coefficient for momentum (tau)
667	REAL(wp), DIMENSION(:,:), INTENT( out) :: Ch ! transfert coefficient for temperature (Q_sens)
668	REAL(wp), DIMENSION(:,:), INTENT( out) :: Ce ! transfert coefficient for evaporation (Q_lat)
669	!!
670	INTEGER :: j_itt
671	INTEGER , PARAMETER :: nb_itt = 3
672	REAL(wp), PARAMETER :: grav = 9.8 ! gravity
673	REAL(wp), PARAMETER :: kappa = 0.4 ! von Karman s constant
674
675	REAL(wp), DIMENSION(:,:), POINTER :: dU10 ! dU [m/s]
676	REAL(wp), DIMENSION(:,:), POINTER :: dT ! air/sea temperature differeence [K]
677	REAL(wp), DIMENSION(:,:), POINTER :: dq ! air/sea humidity difference [K]
678	REAL(wp), DIMENSION(:,:), POINTER :: Cd_n10 ! 10m neutral drag coefficient
679	REAL(wp), DIMENSION(:,:), POINTER :: Ce_n10 ! 10m neutral latent coefficient
680	REAL(wp), DIMENSION(:,:), POINTER :: Ch_n10 ! 10m neutral sensible coefficient
681	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd_n10 ! root square of Cd_n10
682	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd ! root square of Cd
683	REAL(wp), DIMENSION(:,:), POINTER :: T_vpot ! virtual potential temperature [K]
684	REAL(wp), DIMENSION(:,:), POINTER :: T_star ! turbulent scale of tem. fluct.
685	REAL(wp), DIMENSION(:,:), POINTER :: q_star ! turbulent humidity of temp. fluct.
686	REAL(wp), DIMENSION(:,:), POINTER :: U_star ! turb. scale of velocity fluct.
687	REAL(wp), DIMENSION(:,:), POINTER :: L ! Monin-Obukov length [m]
688	REAL(wp), DIMENSION(:,:), POINTER :: zeta ! stability parameter at height zu
689	REAL(wp), DIMENSION(:,:), POINTER :: U_n10 ! neutral wind velocity at 10m [m]
690	REAL(wp), DIMENSION(:,:), POINTER :: xlogt, xct, zpsi_h, zpsi_m
691
692	INTEGER , DIMENSION(:,:), POINTER :: stab ! 1st guess stability test integer
693	!!----------------------------------------------------------------------
694	!
695	IF( nn_timing == 1 ) CALL timing_start('TURB_CORE_1Z')
696	!
697	CALL wrk_alloc( jpi,jpj, stab ) ! integer
698	CALL wrk_alloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
699	CALL wrk_alloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta, U_n10, xlogt, xct, zpsi_h, zpsi_m )
700
701	!! * Start
702	!! Air/sea differences
703	dU10 = max(0.5, dU) ! we don't want to fall under 0.5 m/s
704	dT = T_a - sst ! assuming that T_a is allready the potential temp. at zzu
705	dq = q_a - q_sat
706	!!
707	!! Virtual potential temperature
708	T_vpot = T_a(1. + 0.608q_a)
709	!!
710	!! Neutral Drag Coefficient
711	stab = 0.5 + sign(0.5,dT) ! stable : stab = 1 ; unstable : stab = 0
712	IF ( ln_cdgw ) THEN
713	cdn_wave = cdn_wave - rsmall*(tmask(:,:,1)-1)
714	Cd_n10(:,:) = cdn_wave
715	ELSE
716	Cd_n10 = 1E-3 * ( 2.7/dU10 + 0.142 + dU10/13.09 ) ! L & Y eq. (6a)
717	ENDIF
718	sqrt_Cd_n10 = sqrt(Cd_n10)
719	Ce_n10 = 1E-3 * ( 34.6 * sqrt_Cd_n10 ) ! L & Y eq. (6b)
720	Ch_n10 = 1E-3sqrt_Cd_n10(18stab + 32.7(1-stab)) ! L & Y eq. (6c), (6d)
721	!!
722	!! Initializing transfert coefficients with their first guess neutral equivalents :
723	Cd = Cd_n10 ; Ce = Ce_n10 ; Ch = Ch_n10 ; sqrt_Cd = sqrt(Cd)
724
725	!! * Now starting iteration loop
726	DO j_itt=1, nb_itt
727	!! Turbulent scales :
728	U_star = sqrt_Cd*dU10 ! L & Y eq. (7a)
729	T_star = Ch/sqrt_Cd*dT ! L & Y eq. (7b)
730	q_star = Ce/sqrt_Cd*dq ! L & Y eq. (7c)
731
732	!! Estimate the Monin-Obukov length :
733	L = (U_star*2)/( kappagrav*(T_star/T_vpot + q_star/(q_a + 1./0.608)) )
734
735	!! Stability parameters :
736	zeta = zu/L ; zeta = sign( min(abs(zeta),10.0), zeta )
737	zpsi_h = psi_h(zeta)
738	zpsi_m = psi_m(zeta)
739
740	IF ( ln_cdgw ) THEN
741	sqrt_Cd=kappa/((kappa/sqrt_Cd_n10) - zpsi_m) ; Cd=sqrt_Cd*sqrt_Cd;
742	ELSE
743	!! Shifting the wind speed to 10m and neutral stability :
744	U_n10 = dU101./(1. + sqrt_Cd_n10/kappa(log(zu/10.) - zpsi_m)) ! L & Y eq. (9a)
745
746	!! Updating the neutral 10m transfer coefficients :
747	Cd_n10 = 1E-3 * (2.7/U_n10 + 0.142 + U_n10/13.09) ! L & Y eq. (6a)
748	sqrt_Cd_n10 = sqrt(Cd_n10)
749	Ce_n10 = 1E-3 * (34.6 * sqrt_Cd_n10) ! L & Y eq. (6b)
750	stab = 0.5 + sign(0.5,zeta)
751	Ch_n10 = 1E-3sqrt_Cd_n10(18.stab + 32.7(1-stab)) ! L & Y eq. (6c), (6d)
752
753	!! Shifting the neutral 10m transfer coefficients to ( zu , zeta ) :
754	!!
755	xct = 1. + sqrt_Cd_n10/kappa*(log(zu/10) - zpsi_m)
756	Cd = Cd_n10/(xct*xct) ; sqrt_Cd = sqrt(Cd)
757	ENDIF
758	!!
759	xlogt = log(zu/10.) - zpsi_h
760	!!
761	xct = 1. + Ch_n10*xlogt/kappa/sqrt_Cd_n10
762	Ch = Ch_n10*sqrt_Cd/sqrt_Cd_n10/xct
763	!!
764	xct = 1. + Ce_n10*xlogt/kappa/sqrt_Cd_n10
765	Ce = Ce_n10*sqrt_Cd/sqrt_Cd_n10/xct
766	!!
767	END DO
768	!!
769	CALL wrk_dealloc( jpi,jpj, stab ) ! integer
770	CALL wrk_dealloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
771	CALL wrk_dealloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta, U_n10, xlogt, xct, zpsi_h, zpsi_m )
772	!
773	IF( nn_timing == 1 ) CALL timing_stop('TURB_CORE_1Z')
774	!
775	END SUBROUTINE TURB_CORE_1Z
776
777
778	SUBROUTINE TURB_CORE_2Z(zt, zu, sst, T_zt, q_sat, q_zt, dU, Cd, Ch, Ce, T_zu, q_zu)
779	!!----------------------------------------------------------------------
780	!! * ROUTINE turb_core *
781	!!
782	!! ** Purpose : Computes turbulent transfert coefficients of surface
783	!! fluxes according to Large & Yeager (2004).
784	!!
785	!! ** 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
786	!! Momentum, Latent and sensible heat exchange coefficients
787	!! Caution: this procedure should only be used in cases when air
788	!! temperature (T_air) and air specific humidity (q_air) are at 2m
789	!! whereas wind (dU) is at 10m.
790	!!
791	!! References : Large & Yeager, 2004 : ???
792	!!----------------------------------------------------------------------
793	REAL(wp), INTENT(in ) :: zt ! height for T_zt and q_zt [m]
794	REAL(wp), INTENT(in ) :: zu ! height for dU [m]
795	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: sst ! sea surface temperature [Kelvin]
796	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: T_zt ! potential air temperature [Kelvin]
797	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: q_sat ! sea surface specific humidity [kg/kg]
798	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: q_zt ! specific air humidity [kg/kg]
799	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: dU ! relative wind module \|U(zu)-U(0)\| [m/s]
800	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: Cd ! transfer coefficient for momentum (tau)
801	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: Ch ! transfer coefficient for sensible heat (Q_sens)
802	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: Ce ! transfert coefficient for evaporation (Q_lat)
803	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: T_zu ! air temp. shifted at zu [K]
804	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: q_zu ! spec. hum. shifted at zu [kg/kg]
805
806	INTEGER :: j_itt
807	INTEGER , PARAMETER :: nb_itt = 3 ! number of itterations
808	REAL(wp), PARAMETER :: grav = 9.8 ! gravity
809	REAL(wp), PARAMETER :: kappa = 0.4 ! von Karman's constant
810
811	REAL(wp), DIMENSION(:,:), POINTER :: dU10 ! dU [m/s]
812	REAL(wp), DIMENSION(:,:), POINTER :: dT ! air/sea temperature differeence [K]
813	REAL(wp), DIMENSION(:,:), POINTER :: dq ! air/sea humidity difference [K]
814	REAL(wp), DIMENSION(:,:), POINTER :: Cd_n10 ! 10m neutral drag coefficient
815	REAL(wp), DIMENSION(:,:), POINTER :: Ce_n10 ! 10m neutral latent coefficient
816	REAL(wp), DIMENSION(:,:), POINTER :: Ch_n10 ! 10m neutral sensible coefficient
817	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd_n10 ! root square of Cd_n10
818	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd ! root square of Cd
819	REAL(wp), DIMENSION(:,:), POINTER :: T_vpot ! virtual potential temperature [K]
820	REAL(wp), DIMENSION(:,:), POINTER :: T_star ! turbulent scale of tem. fluct.
821	REAL(wp), DIMENSION(:,:), POINTER :: q_star ! turbulent humidity of temp. fluct.
822	REAL(wp), DIMENSION(:,:), POINTER :: U_star ! turb. scale of velocity fluct.
823	REAL(wp), DIMENSION(:,:), POINTER :: L ! Monin-Obukov length [m]
824	REAL(wp), DIMENSION(:,:), POINTER :: zeta_u ! stability parameter at height zu
825	REAL(wp), DIMENSION(:,:), POINTER :: zeta_t ! stability parameter at height zt
826	REAL(wp), DIMENSION(:,:), POINTER :: U_n10 ! neutral wind velocity at 10m [m]
827	REAL(wp), DIMENSION(:,:), POINTER :: xlogt, xct, zpsi_hu, zpsi_ht, zpsi_m
828
829	INTEGER , DIMENSION(:,:), POINTER :: stab ! 1st stability test integer
830	!!----------------------------------------------------------------------
831	!
832	IF( nn_timing == 1 ) CALL timing_start('TURB_CORE_2Z')
833	!
834	CALL wrk_alloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
835	CALL wrk_alloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta_u, zeta_t, U_n10 )
836	CALL wrk_alloc( jpi,jpj, xlogt, xct, zpsi_hu, zpsi_ht, zpsi_m )
837	CALL wrk_alloc( jpi,jpj, stab ) ! interger
838
839	!! Initial air/sea differences
840	dU10 = max(0.5, dU) ! we don't want to fall under 0.5 m/s
841	dT = T_zt - sst
842	dq = q_zt - q_sat
843
844	!! Neutral Drag Coefficient :
845	stab = 0.5 + sign(0.5,dT) ! stab = 1 if dT > 0 -> STABLE
846	IF( ln_cdgw ) THEN
847	cdn_wave = cdn_wave - rsmall*(tmask(:,:,1)-1)
848	Cd_n10(:,:) = cdn_wave
849	ELSE
850	Cd_n10 = 1E-3*( 2.7/dU10 + 0.142 + dU10/13.09 )
851	ENDIF
852	sqrt_Cd_n10 = sqrt(Cd_n10)
853	Ce_n10 = 1E-3( 34.6 sqrt_Cd_n10 )
854	Ch_n10 = 1E-3sqrt_Cd_n10(18stab + 32.7(1 - stab))
855
856	!! Initializing transf. coeff. with their first guess neutral equivalents :
857	Cd = Cd_n10 ; Ce = Ce_n10 ; Ch = Ch_n10 ; sqrt_Cd = sqrt(Cd)
858
859	!! Initializing z_u values with z_t values :
860	T_zu = T_zt ; q_zu = q_zt
861
862	!! * Now starting iteration loop
863	DO j_itt=1, nb_itt
864	dT = T_zu - sst ; dq = q_zu - q_sat ! Updating air/sea differences
865	T_vpot = T_zu(1. + 0.608q_zu) ! Updating virtual potential temperature at zu
866	U_star = sqrt_Cd*dU10 ! Updating turbulent scales : (L & Y eq. (7))
867	T_star = Ch/sqrt_Cd*dT !
868	q_star = Ce/sqrt_Cd*dq !
869	!!
870	L = (U_star*U_star) & ! Estimate the Monin-Obukov length at height zu
871	& / (kappagrav/T_vpot(T_star(1.+0.608q_zu) + 0.608T_zuq_star))
872	!! Stability parameters :
873	zeta_u = zu/L ; zeta_u = sign( min(abs(zeta_u),10.0), zeta_u )
874	zeta_t = zt/L ; zeta_t = sign( min(abs(zeta_t),10.0), zeta_t )
875	zpsi_hu = psi_h(zeta_u)
876	zpsi_ht = psi_h(zeta_t)
877	zpsi_m = psi_m(zeta_u)
878	!!
879	!! Shifting the wind speed to 10m and neutral stability : (L & Y eq.(9a))
880	! U_n10 = dU10/(1. + sqrt_Cd_n10/kappa*(log(zu/10.) - psi_m(zeta_u)))
881	U_n10 = dU10/(1. + sqrt_Cd_n10/kappa*(log(zu/10.) - zpsi_m))
882	!!
883	!! Shifting temperature and humidity at zu : (L & Y eq. (9b-9c))
884	! T_zu = T_zt - T_star/kappa*(log(zt/zu) + psi_h(zeta_u) - psi_h(zeta_t))
885	T_zu = T_zt - T_star/kappa*(log(zt/zu) + zpsi_hu - zpsi_ht)
886	! q_zu = q_zt - q_star/kappa*(log(zt/zu) + psi_h(zeta_u) - psi_h(zeta_t))
887	q_zu = q_zt - q_star/kappa*(log(zt/zu) + zpsi_hu - zpsi_ht)
888	!!
889	!! q_zu cannot have a negative value : forcing 0
890	stab = 0.5 + sign(0.5,q_zu) ; q_zu = stab*q_zu
891	!!
892	IF( ln_cdgw ) THEN
893	sqrt_Cd=kappa/((kappa/sqrt_Cd_n10) - zpsi_m) ; Cd=sqrt_Cd*sqrt_Cd;
894	ELSE
895	!! Updating the neutral 10m transfer coefficients :
896	Cd_n10 = 1E-3 * (2.7/U_n10 + 0.142 + U_n10/13.09) ! L & Y eq. (6a)
897	sqrt_Cd_n10 = sqrt(Cd_n10)
898	Ce_n10 = 1E-3 * (34.6 * sqrt_Cd_n10) ! L & Y eq. (6b)
899	stab = 0.5 + sign(0.5,zeta_u)
900	Ch_n10 = 1E-3sqrt_Cd_n10(18.stab + 32.7(1-stab)) ! L & Y eq. (6c-6d)
901	!!
902	!!
903	!! Shifting the neutral 10m transfer coefficients to (zu,zeta_u) :
904	xct = 1. + sqrt_Cd_n10/kappa*(log(zu/10.) - zpsi_m)
905	Cd = Cd_n10/(xct*xct) ; sqrt_Cd = sqrt(Cd)
906	ENDIF
907	!!
908	xlogt = log(zu/10.) - zpsi_hu
909	!!
910	xct = 1. + Ch_n10*xlogt/kappa/sqrt_Cd_n10
911	Ch = Ch_n10*sqrt_Cd/sqrt_Cd_n10/xct
912	!!
913	xct = 1. + Ce_n10*xlogt/kappa/sqrt_Cd_n10
914	Ce = Ce_n10*sqrt_Cd/sqrt_Cd_n10/xct
915	!!
916	!!
917	END DO
918	!!
919	CALL wrk_dealloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
920	CALL wrk_dealloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta_u, zeta_t, U_n10 )
921	CALL wrk_dealloc( jpi,jpj, xlogt, xct, zpsi_hu, zpsi_ht, zpsi_m )
922	CALL wrk_dealloc( jpi,jpj, stab ) ! interger
923	!
924	IF( nn_timing == 1 ) CALL timing_stop('TURB_CORE_2Z')
925	!
926	END SUBROUTINE TURB_CORE_2Z
927
928
929	FUNCTION psi_m(zta) !! Psis, L & Y eq. (8c), (8d), (8e)
930	!-------------------------------------------------------------------------------
931	REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: zta
932
933	REAL(wp), PARAMETER :: pi = 3.141592653589793_wp
934	REAL(wp), DIMENSION(jpi,jpj) :: psi_m
935	REAL(wp), DIMENSION(:,:), POINTER :: X2, X, stabit
936	!-------------------------------------------------------------------------------
937
938	CALL wrk_alloc( jpi,jpj, X2, X, stabit )
939
940	X2 = sqrt(abs(1. - 16.*zta)) ; X2 = max(X2 , 1.0) ; X = sqrt(X2)
941	stabit = 0.5 + sign(0.5,zta)
942	psi_m = -5.ztastabit & ! Stable
943	& + (1. - stabit)(2log((1. + X)/2) + log((1. + X2)/2) - 2*atan(X) + pi/2) ! Unstable
944
945	CALL wrk_dealloc( jpi,jpj, X2, X, stabit )
946	!
947	END FUNCTION psi_m
948
949
950	FUNCTION psi_h( zta ) !! Psis, L & Y eq. (8c), (8d), (8e)
951	!-------------------------------------------------------------------------------
952	REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: zta
953	!
954	REAL(wp), DIMENSION(jpi,jpj) :: psi_h
955	REAL(wp), DIMENSION(:,:), POINTER :: X2, X, stabit
956	!-------------------------------------------------------------------------------
957
958	CALL wrk_alloc( jpi,jpj, X2, X, stabit )
959
960	X2 = sqrt(abs(1. - 16.*zta)) ; X2 = max(X2 , 1.) ; X = sqrt(X2)
961	stabit = 0.5 + sign(0.5,zta)
962	psi_h = -5.ztastabit & ! Stable
963	& + (1. - stabit)(2.log( (1. + X2)/2. )) ! Unstable
964
965	CALL wrk_dealloc( jpi,jpj, X2, X, stabit )
966	!
967	END FUNCTION psi_h
968
969	!!======================================================================
970	END MODULE sbcblk_core

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