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sbcblk_core.F90 in branches/2013/dev_LOCEAN_CMCC_INGV_2013/NEMOGCM/NEMO/OPA_SRC/SBC – NEMO

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source: branches/2013/dev_LOCEAN_CMCC_INGV_2013/NEMOGCM/NEMO/OPA_SRC/SBC/sbcblk_core.F90 @ 4230

Last change on this file since 4230 was 4230, checked in by cetlod, 10 years ago
dev_LOCEAN_CMCC_INGV_2013 : merge LOCEAN & CMCC_INGV branches, see ticket #1182
Property svn:keywords set to `Id`
File size: 54.4 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	USE lib_fortran ! to use key_nosignedzero
45
46	IMPLICIT NONE
47	PRIVATE
48
49	PUBLIC sbc_blk_core ! routine called in sbcmod module
50	PUBLIC blk_ice_core ! routine called in sbc_ice_lim module
51	PUBLIC turb_core_2z ! routine calles in sbcblk_mfs module
52
53	INTEGER , PARAMETER :: jpfld = 9 ! maximum number of files to read
54	INTEGER , PARAMETER :: jp_wndi = 1 ! index of 10m wind velocity (i-component) (m/s) at T-point
55	INTEGER , PARAMETER :: jp_wndj = 2 ! index of 10m wind velocity (j-component) (m/s) at T-point
56	INTEGER , PARAMETER :: jp_humi = 3 ! index of specific humidity ( % )
57	INTEGER , PARAMETER :: jp_qsr = 4 ! index of solar heat (W/m2)
58	INTEGER , PARAMETER :: jp_qlw = 5 ! index of Long wave (W/m2)
59	INTEGER , PARAMETER :: jp_tair = 6 ! index of 10m air temperature (Kelvin)
60	INTEGER , PARAMETER :: jp_prec = 7 ! index of total precipitation (rain+snow) (Kg/m2/s)
61	INTEGER , PARAMETER :: jp_snow = 8 ! index of snow (solid prcipitation) (kg/m2/s)
62	INTEGER , PARAMETER :: jp_tdif = 9 ! index of tau diff associated to HF tau (N/m2) at T-point
63
64	TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf ! structure of input fields (file informations, fields read)
65
66	! !!! CORE bulk parameters
67	REAL(wp), PARAMETER :: rhoa = 1.22 ! air density
68	REAL(wp), PARAMETER :: cpa = 1000.5 ! specific heat of air
69	REAL(wp), PARAMETER :: Lv = 2.5e6 ! latent heat of vaporization
70	REAL(wp), PARAMETER :: Ls = 2.839e6 ! latent heat of sublimation
71	REAL(wp), PARAMETER :: Stef = 5.67e-8 ! Stefan Boltzmann constant
72	REAL(wp), PARAMETER :: Cice = 1.4e-3 ! iovi 1.63e-3 ! transfer coefficient over ice
73	REAL(wp), PARAMETER :: albo = 0.066 ! ocean albedo assumed to be constant
74
75	! !!* Namelist namsbc_core : CORE bulk parameters
76	LOGICAL :: ln_2m ! logical flag for height of air temp. and hum
77	LOGICAL :: ln_taudif ! logical flag to use the "mean of stress module - module of mean stress" data
78	REAL(wp) :: rn_pfac ! multiplication factor for precipitation
79	REAL(wp) :: rn_efac ! multiplication factor for evaporation (clem)
80	REAL(wp) :: rn_vfac ! multiplication factor for ice/ocean velocity in the calculation of wind stress (clem)
81
82	!! * Substitutions
83	# include "domzgr_substitute.h90"
84	# include "vectopt_loop_substitute.h90"
85	!!----------------------------------------------------------------------
86	!! NEMO/OPA 3.3 , NEMO-consortium (2010)
87	!! $Id$
88	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
89	!!----------------------------------------------------------------------
90	CONTAINS
91
92	SUBROUTINE sbc_blk_core( kt )
93	!!---------------------------------------------------------------------
94	!! * ROUTINE sbc_blk_core *
95	!!
96	!! ** Purpose : provide at each time step the surface ocean fluxes
97	!! (momentum, heat, freshwater and runoff)
98	!!
99	!! ** Method : (1) READ each fluxes in NetCDF files:
100	!! the 10m wind velocity (i-component) (m/s) at T-point
101	!! the 10m wind velocity (j-component) (m/s) at T-point
102	!! the 10m or 2m specific humidity ( % )
103	!! the solar heat (W/m2)
104	!! the Long wave (W/m2)
105	!! the 10m or 2m air temperature (Kelvin)
106	!! the total precipitation (rain+snow) (Kg/m2/s)
107	!! the snow (solid prcipitation) (kg/m2/s)
108	!! the tau diff associated to HF tau (N/m2) at T-point (ln_taudif=T)
109	!! (2) CALL blk_oce_core
110	!!
111	!! C A U T I O N : never mask the surface stress fields
112	!! the stress is assumed to be in the (i,j) mesh referential
113	!!
114	!! ** Action : defined at each time-step at the air-sea interface
115	!! - utau, vtau i- and j-component of the wind stress
116	!! - taum, wndm wind stress and 10m wind modules at T-point
117	!! - qns, qsr non-solar and solar heat fluxes
118	!! - emp upward mass flux (evapo. - precip.)
119	!! - sfx salt flux due to freezing/melting (non-zero only if ice is present)
120	!! (set in limsbc(_2).F90)
121	!!----------------------------------------------------------------------
122	INTEGER, INTENT(in) :: kt ! ocean time step
123	!!
124	INTEGER :: ierror ! return error code
125	INTEGER :: ifpr ! dummy loop indice
126	INTEGER :: jfld ! dummy loop arguments
127	INTEGER :: ios ! Local integer output status for namelist read
128	!!
129	CHARACTER(len=100) :: cn_dir ! Root directory for location of core files
130	TYPE(FLD_N), DIMENSION(jpfld) :: slf_i ! array of namelist informations on the fields to read
131	TYPE(FLD_N) :: sn_wndi, sn_wndj, sn_humi, sn_qsr ! informations about the fields to be read
132	TYPE(FLD_N) :: sn_qlw , sn_tair, sn_prec, sn_snow ! " "
133	TYPE(FLD_N) :: sn_tdif ! " "
134	NAMELIST/namsbc_core/ cn_dir , ln_2m , ln_taudif, rn_pfac, rn_efac, rn_vfac, &
135	& sn_wndi, sn_wndj, sn_humi , sn_qsr , &
136	& sn_qlw , sn_tair, sn_prec , sn_snow, sn_tdif
137	!!---------------------------------------------------------------------
138
139	! ! ====================== !
140	IF( kt == nit000 ) THEN ! First call kt=nit000 !
141	! ! ====================== !
142	!
143	REWIND( numnam_ref ) ! Namelist namsbc_core in reference namelist : CORE bulk parameters
144	READ ( numnam_ref, namsbc_core, IOSTAT = ios, ERR = 901)
145	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_core in reference namelist', lwp )
146
147	REWIND( numnam_cfg ) ! Namelist namsbc_core in configuration namelist : CORE bulk parameters
148	READ ( numnam_cfg, namsbc_core, IOSTAT = ios, ERR = 902 )
149	902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_core in configuration namelist', lwp )
150
151	WRITE ( numond, namsbc_core )
152	! ! check: do we plan to use ln_dm2dc with non-daily forcing?
153	IF( ln_dm2dc .AND. sn_qsr%nfreqh /= 24 ) &
154	& CALL ctl_stop( 'sbc_blk_core: ln_dm2dc can be activated only with daily short-wave forcing' )
155	IF( ln_dm2dc .AND. sn_qsr%ln_tint ) THEN
156	CALL ctl_warn( 'sbc_blk_core: ln_dm2dc is taking care of the temporal interpolation of daily qsr', &
157	& ' ==> We force time interpolation = .false. for qsr' )
158	sn_qsr%ln_tint = .false.
159	ENDIF
160	! ! store namelist information in an array
161	slf_i(jp_wndi) = sn_wndi ; slf_i(jp_wndj) = sn_wndj
162	slf_i(jp_qsr ) = sn_qsr ; slf_i(jp_qlw ) = sn_qlw
163	slf_i(jp_tair) = sn_tair ; slf_i(jp_humi) = sn_humi
164	slf_i(jp_prec) = sn_prec ; slf_i(jp_snow) = sn_snow
165	slf_i(jp_tdif) = sn_tdif
166	!
167	lhftau = ln_taudif ! do we use HF tau information?
168	jfld = jpfld - COUNT( (/.NOT. lhftau/) )
169	!
170	ALLOCATE( sf(jfld), STAT=ierror ) ! set sf structure
171	IF( ierror > 0 ) CALL ctl_stop( 'STOP', 'sbc_blk_core: unable to allocate sf structure' )
172	DO ifpr= 1, jfld
173	ALLOCATE( sf(ifpr)%fnow(jpi,jpj,1) )
174	IF( slf_i(ifpr)%ln_tint ) ALLOCATE( sf(ifpr)%fdta(jpi,jpj,1,2) )
175	END DO
176	! ! fill sf with slf_i and control print
177	CALL fld_fill( sf, slf_i, cn_dir, 'sbc_blk_core', 'flux formulation for ocean surface boundary condition', 'namsbc_core' )
178	!
179	sfx(:,:) = 0._wp ! salt flux; zero unless ice is present (computed in limsbc(_2).F90)
180	!
181	ENDIF
182
183	CALL fld_read( kt, nn_fsbc, sf ) ! input fields provided at the current time-step
184
185	! ! compute the surface ocean fluxes using CORE bulk formulea
186	IF( MOD( kt - 1, nn_fsbc ) == 0 ) CALL blk_oce_core( kt, sf, sst_m, ssu_m, ssv_m )
187
188	#if defined key_cice
189	IF( MOD( kt - 1, nn_fsbc ) == 0 ) THEN
190	qlw_ice(:,:,1) = sf(jp_qlw)%fnow(:,:,1)
191	qsr_ice(:,:,1) = sf(jp_qsr)%fnow(:,:,1)
192	tatm_ice(:,:) = sf(jp_tair)%fnow(:,:,1)
193	qatm_ice(:,:) = sf(jp_humi)%fnow(:,:,1)
194	tprecip(:,:) = sf(jp_prec)%fnow(:,:,1) * rn_pfac
195	sprecip(:,:) = sf(jp_snow)%fnow(:,:,1) * rn_pfac
196	wndi_ice(:,:) = sf(jp_wndi)%fnow(:,:,1)
197	wndj_ice(:,:) = sf(jp_wndj)%fnow(:,:,1)
198	ENDIF
199	#endif
200	!
201	END SUBROUTINE sbc_blk_core
202
203
204	SUBROUTINE blk_oce_core( kt, sf, pst, pu, pv )
205	!!---------------------------------------------------------------------
206	!! * ROUTINE blk_core *
207	!!
208	!! ** Purpose : provide the momentum, heat and freshwater fluxes at
209	!! the ocean surface at each time step
210	!!
211	!! ** Method : CORE bulk formulea for the ocean using atmospheric
212	!! fields read in sbc_read
213	!!
214	!! ** Outputs : - utau : i-component of the stress at U-point (N/m2)
215	!! - vtau : j-component of the stress at V-point (N/m2)
216	!! - taum : Wind stress module at T-point (N/m2)
217	!! - wndm : Wind speed module at T-point (m/s)
218	!! - qsr : Solar heat flux over the ocean (W/m2)
219	!! - qns : Non Solar heat flux over the ocean (W/m2)
220	!! - evap : Evaporation over the ocean (kg/m2/s)
221	!! - emp : evaporation minus precipitation (kg/m2/s)
222	!!
223	!! ** Nota : sf has to be a dummy argument for AGRIF on NEC
224	!!---------------------------------------------------------------------
225	INTEGER , INTENT(in ) :: kt ! time step index
226	TYPE(fld), INTENT(inout), DIMENSION(:) :: sf ! input data
227	REAL(wp) , INTENT(in) , DIMENSION(:,:) :: pst ! surface temperature [Celcius]
228	REAL(wp) , INTENT(in) , DIMENSION(:,:) :: pu ! surface current at U-point (i-component) [m/s]
229	REAL(wp) , INTENT(in) , DIMENSION(:,:) :: pv ! surface current at V-point (j-component) [m/s]
230	!
231	INTEGER :: ji, jj ! dummy loop indices
232	REAL(wp) :: zcoef_qsatw, zztmp ! local variable
233	REAL(wp), DIMENSION(:,:), POINTER :: zwnd_i, zwnd_j ! wind speed components at T-point
234	REAL(wp), DIMENSION(:,:), POINTER :: zqsatw ! specific humidity at pst
235	REAL(wp), DIMENSION(:,:), POINTER :: zqlw, zqsb ! long wave and sensible heat fluxes
236	REAL(wp), DIMENSION(:,:), POINTER :: zqla, zevap ! latent heat fluxes and evaporation
237	REAL(wp), DIMENSION(:,:), POINTER :: Cd ! transfer coefficient for momentum (tau)
238	REAL(wp), DIMENSION(:,:), POINTER :: Ch ! transfer coefficient for sensible heat (Q_sens)
239	REAL(wp), DIMENSION(:,:), POINTER :: Ce ! tansfert coefficient for evaporation (Q_lat)
240	REAL(wp), DIMENSION(:,:), POINTER :: zst ! surface temperature in Kelvin
241	REAL(wp), DIMENSION(:,:), POINTER :: zt_zu ! air temperature at wind speed height
242	REAL(wp), DIMENSION(:,:), POINTER :: zq_zu ! air spec. hum. at wind speed height
243	!!---------------------------------------------------------------------
244	!
245	IF( nn_timing == 1 ) CALL timing_start('blk_oce_core')
246	!
247	CALL wrk_alloc( jpi,jpj, zwnd_i, zwnd_j, zqsatw, zqlw, zqsb, zqla, zevap )
248	CALL wrk_alloc( jpi,jpj, Cd, Ch, Ce, zst, zt_zu, zq_zu )
249	!
250	! local scalars ( place there for vector optimisation purposes)
251	zcoef_qsatw = 0.98 * 640380. / rhoa
252
253	zst(:,:) = pst(:,:) + rt0 ! convert SST from Celcius to Kelvin (and set minimum value far above 0 K)
254
255	! ----------------------------------------------------------------------------- !
256	! 0 Wind components and module at T-point relative to the moving ocean !
257	! ----------------------------------------------------------------------------- !
258
259	! ... components ( U10m - U_oce ) at T-point (unmasked)
260	zwnd_i(:,:) = 0.e0
261	zwnd_j(:,:) = 0.e0
262	#if defined key_cyclone
263	# if defined key_vectopt_loop
264	!CDIR COLLAPSE
265	# endif
266	CALL wnd_cyc( kt, zwnd_i, zwnd_j ) ! add Manu !
267	DO jj = 2, jpjm1
268	DO ji = fs_2, fs_jpim1 ! vect. opt.
269	sf(jp_wndi)%fnow(ji,jj,1) = sf(jp_wndi)%fnow(ji,jj,1) + zwnd_i(ji,jj)
270	sf(jp_wndj)%fnow(ji,jj,1) = sf(jp_wndj)%fnow(ji,jj,1) + zwnd_j(ji,jj)
271	END DO
272	END DO
273	#endif
274	#if defined key_vectopt_loop
275	!CDIR COLLAPSE
276	#endif
277	DO jj = 2, jpjm1
278	DO ji = fs_2, fs_jpim1 ! vect. opt.
279	zwnd_i(ji,jj) = ( sf(jp_wndi)%fnow(ji,jj,1) - rn_vfac * 0.5 * ( pu(ji-1,jj ) + pu(ji,jj) ) )
280	zwnd_j(ji,jj) = ( sf(jp_wndj)%fnow(ji,jj,1) - rn_vfac * 0.5 * ( pv(ji ,jj-1) + pv(ji,jj) ) )
281	END DO
282	END DO
283	CALL lbc_lnk( zwnd_i(:,:) , 'T', -1. )
284	CALL lbc_lnk( zwnd_j(:,:) , 'T', -1. )
285	! ... scalar wind ( = \| U10m - U_oce \| ) at T-point (masked)
286	!CDIR NOVERRCHK
287	!CDIR COLLAPSE
288	wndm(:,:) = SQRT( zwnd_i(:,:) * zwnd_i(:,:) &
289	& + zwnd_j(:,:) * zwnd_j(:,:) ) * tmask(:,:,1)
290
291	! ----------------------------------------------------------------------------- !
292	! I Radiative FLUXES !
293	! ----------------------------------------------------------------------------- !
294
295	! ocean albedo assumed to be constant + modify now Qsr to include the diurnal cycle ! Short Wave
296	zztmp = 1. - albo
297	IF( ln_dm2dc ) THEN ; qsr(:,:) = zztmp * sbc_dcy( sf(jp_qsr)%fnow(:,:,1) ) * tmask(:,:,1)
298	ELSE ; qsr(:,:) = zztmp * sf(jp_qsr)%fnow(:,:,1) * tmask(:,:,1)
299	ENDIF
300	!CDIR COLLAPSE
301	zqlw(:,:) = ( sf(jp_qlw)%fnow(:,:,1) - Stef * zst(:,:)zst(:,:)zst(:,:)zst(:,:) ) tmask(:,:,1) ! Long Wave
302	! ----------------------------------------------------------------------------- !
303	! II Turbulent FLUXES !
304	! ----------------------------------------------------------------------------- !
305
306	! ... specific humidity at SST and IST
307	!CDIR NOVERRCHK
308	!CDIR COLLAPSE
309	zqsatw(:,:) = zcoef_qsatw * EXP( -5107.4 / zst(:,:) )
310
311	! ... NCAR Bulk formulae, computation of Cd, Ch, Ce at T-point :
312	IF( ln_2m ) THEN
313	!! If air temp. and spec. hum. are given at different height (2m) than wind (10m) :
314	CALL TURB_CORE_2Z(2.,10., zst , sf(jp_tair)%fnow, &
315	& zqsatw, sf(jp_humi)%fnow, wndm, &
316	& Cd , Ch , Ce , &
317	& zt_zu , zq_zu )
318	ELSE
319	!! If air temp. and spec. hum. are given at same height than wind (10m) :
320	!gm bug? at the compiling phase, add a copy in temporary arrays... ==> check perf
321	! CALL TURB_CORE_1Z( 10., zst (:,:), sf(jp_tair)%fnow(:,:), &
322	! & zqsatw(:,:), sf(jp_humi)%fnow(:,:), wndm(:,:), &
323	! & Cd (:,:), Ch (:,:), Ce (:,:) )
324	!gm bug
325	! ARPDBG - this won't compile with gfortran. Fix but check performance
326	! as per comment above.
327	CALL TURB_CORE_1Z( 10., zst , sf(jp_tair)%fnow(:,:,1), &
328	& zqsatw, sf(jp_humi)%fnow(:,:,1), wndm, &
329	& Cd , Ch , Ce )
330	ENDIF
331
332	! ... tau module, i and j component
333	DO jj = 1, jpj
334	DO ji = 1, jpi
335	zztmp = rhoa * wndm(ji,jj) * Cd(ji,jj)
336	taum (ji,jj) = zztmp * wndm (ji,jj)
337	zwnd_i(ji,jj) = zztmp * zwnd_i(ji,jj)
338	zwnd_j(ji,jj) = zztmp * zwnd_j(ji,jj)
339	END DO
340	END DO
341
342	! ... add the HF tau contribution to the wind stress module?
343	IF( lhftau ) THEN
344	!CDIR COLLAPSE
345	taum(:,:) = taum(:,:) + sf(jp_tdif)%fnow(:,:,1)
346	ENDIF
347	CALL iom_put( "taum_oce", taum ) ! output wind stress module
348
349	! ... utau, vtau at U- and V_points, resp.
350	! Note the use of 0.5*(2-umask) in order to unmask the stress along coastlines
351	DO jj = 1, jpjm1
352	DO ji = 1, fs_jpim1
353	utau(ji,jj) = 0.5 * ( 2. - umask(ji,jj,1) ) * ( zwnd_i(ji,jj) + zwnd_i(ji+1,jj ) )
354	vtau(ji,jj) = 0.5 * ( 2. - vmask(ji,jj,1) ) * ( zwnd_j(ji,jj) + zwnd_j(ji ,jj+1) )
355	END DO
356	END DO
357	CALL lbc_lnk( utau(:,:), 'U', -1. )
358	CALL lbc_lnk( vtau(:,:), 'V', -1. )
359
360	! Turbulent fluxes over ocean
361	! -----------------------------
362	IF( ln_2m ) THEN
363	! Values of temp. and hum. adjusted to 10m must be used instead of 2m values
364	zevap(:,:) = rn_efac * MAX( 0.e0, rhoa Ce(:,:)( zqsatw(:,:) - zq_zu(:,:) ) * wndm(:,:) ) ! Evaporation
365	zqsb (:,:) = rhoacpaCh(:,:)( zst (:,:) - zt_zu(:,:) ) wndm(:,:) ! Sensible Heat
366	ELSE
367	!CDIR COLLAPSE
368	zevap(:,:) = rn_efac * MAX( 0.e0, rhoa Ce(:,:)( zqsatw(:,:) - sf(jp_humi)%fnow(:,:,1) ) * wndm(:,:) ) ! Evaporation
369	!CDIR COLLAPSE
370	zqsb (:,:) = rhoacpaCh(:,:)( zst (:,:) - sf(jp_tair)%fnow(:,:,1) ) wndm(:,:) ! Sensible Heat
371	ENDIF
372	!CDIR COLLAPSE
373	zqla (:,:) = Lv * zevap(:,:) ! Latent Heat
374
375	IF(ln_ctl) THEN
376	CALL prt_ctl( tab2d_1=zqla , clinfo1=' blk_oce_core: zqla : ', tab2d_2=Ce , clinfo2=' Ce : ' )
377	CALL prt_ctl( tab2d_1=zqsb , clinfo1=' blk_oce_core: zqsb : ', tab2d_2=Ch , clinfo2=' Ch : ' )
378	CALL prt_ctl( tab2d_1=zqlw , clinfo1=' blk_oce_core: zqlw : ', tab2d_2=qsr, clinfo2=' qsr : ' )
379	CALL prt_ctl( tab2d_1=zqsatw, clinfo1=' blk_oce_core: zqsatw : ', tab2d_2=zst, clinfo2=' zst : ' )
380	CALL prt_ctl( tab2d_1=utau , clinfo1=' blk_oce_core: utau : ', mask1=umask, &
381	& tab2d_2=vtau , clinfo2= ' vtau : ' , mask2=vmask )
382	CALL prt_ctl( tab2d_1=wndm , clinfo1=' blk_oce_core: wndm : ')
383	CALL prt_ctl( tab2d_1=zst , clinfo1=' blk_oce_core: zst : ')
384	ENDIF
385
386	! ----------------------------------------------------------------------------- !
387	! III Total FLUXES !
388	! ----------------------------------------------------------------------------- !
389
390	!CDIR COLLAPSE
391	emp (:,:) = ( zevap(:,:) & ! mass flux (evap. - precip.)
392	& - sf(jp_prec)%fnow(:,:,1) * rn_pfac ) * tmask(:,:,1)
393	!CDIR COLLAPSE
394	qns(:,:) = zqlw(:,:) - zqsb(:,:) - zqla(:,:) & ! Downward Non Solar flux
395	& - sf(jp_snow)%fnow(:,:,1) * rn_pfac * lfus & ! remove latent melting heat for solid precip
396	& - zevap(:,:) * pst(:,:) * rcp & ! remove evap heat content at SST
397	& + ( sf(jp_prec)%fnow(:,:,1) - sf(jp_snow)%fnow(:,:,1) ) * rn_pfac & ! add liquid precip heat content at Tair
398	& * ( sf(jp_tair)%fnow(:,:,1) - rt0 ) * rcp &
399	& + sf(jp_snow)%fnow(:,:,1) * rn_pfac & ! add solid precip heat content at min(Tair,Tsnow)
400	& * ( MIN( sf(jp_tair)%fnow(:,:,1), rt0_snow ) - rt0 ) * cpic
401	!
402	CALL iom_put( "qlw_oce", zqlw ) ! output downward longwave heat over the ocean
403	CALL iom_put( "qsb_oce", - zqsb ) ! output downward sensible heat over the ocean
404	CALL iom_put( "qla_oce", - zqla ) ! output downward latent heat over the ocean
405	CALL iom_put( "qhc_oce", qns-zqlw+zqsb+zqla ) ! output downward heat content of E-P over the ocean
406	CALL iom_put( "qns_oce", qns ) ! output downward non solar heat over the ocean
407	!
408	IF(ln_ctl) THEN
409	CALL prt_ctl(tab2d_1=zqsb , clinfo1=' blk_oce_core: zqsb : ', tab2d_2=zqlw , clinfo2=' zqlw : ')
410	CALL prt_ctl(tab2d_1=zqla , clinfo1=' blk_oce_core: zqla : ', tab2d_2=qsr , clinfo2=' qsr : ')
411	CALL prt_ctl(tab2d_1=pst , clinfo1=' blk_oce_core: pst : ', tab2d_2=emp , clinfo2=' emp : ')
412	CALL prt_ctl(tab2d_1=utau , clinfo1=' blk_oce_core: utau : ', mask1=umask, &
413	& tab2d_2=vtau , clinfo2= ' vtau : ' , mask2=vmask )
414	ENDIF
415	!
416	CALL wrk_dealloc( jpi,jpj, zwnd_i, zwnd_j, zqsatw, zqlw, zqsb, zqla, zevap )
417	CALL wrk_dealloc( jpi,jpj, Cd, Ch, Ce, zst, zt_zu, zq_zu )
418	!
419	IF( nn_timing == 1 ) CALL timing_stop('blk_oce_core')
420	!
421	END SUBROUTINE blk_oce_core
422
423
424	SUBROUTINE blk_ice_core( pst , pui , pvi , palb , &
425	& p_taui, p_tauj, p_qns , p_qsr, &
426	& p_qla , p_dqns, p_dqla, &
427	& p_tpr , p_spr , &
428	& p_fr1 , p_fr2 , cd_grid, pdim )
429	!!---------------------------------------------------------------------
430	!! * ROUTINE blk_ice_core *
431	!!
432	!! ** Purpose : provide the surface boundary condition over sea-ice
433	!!
434	!! ** Method : compute momentum, heat and freshwater exchanged
435	!! between atmosphere and sea-ice using CORE bulk
436	!! formulea, ice variables and read atmmospheric fields.
437	!! NB: ice drag coefficient is assumed to be a constant
438	!!
439	!! caution : the net upward water flux has with mm/day unit
440	!!---------------------------------------------------------------------
441	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: pst ! ice surface temperature (>0, =rt0 over land) [Kelvin]
442	REAL(wp), DIMENSION(:,:) , INTENT(in ) :: pui ! ice surface velocity (i- and i- components [m/s]
443	REAL(wp), DIMENSION(:,:) , INTENT(in ) :: pvi ! at I-point (B-grid) or U & V-point (C-grid)
444	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: palb ! ice albedo (clear sky) (alb_ice_cs) [%]
445	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_taui ! i- & j-components of surface ice stress [N/m2]
446	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_tauj ! at I-point (B-grid) or U & V-point (C-grid)
447	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qns ! non solar heat flux over ice (T-point) [W/m2]
448	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qsr ! solar heat flux over ice (T-point) [W/m2]
449	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qla ! latent heat flux over ice (T-point) [W/m2]
450	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_dqns ! non solar heat sensistivity (T-point) [W/m2]
451	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_dqla ! latent heat sensistivity (T-point) [W/m2]
452	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_tpr ! total precipitation (T-point) [Kg/m2/s]
453	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_spr ! solid precipitation (T-point) [Kg/m2/s]
454	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_fr1 ! 1sr fraction of qsr penetration in ice (T-point) [%]
455	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_fr2 ! 2nd fraction of qsr penetration in ice (T-point) [%]
456	CHARACTER(len=1) , INTENT(in ) :: cd_grid ! ice grid ( C or B-grid)
457	INTEGER , INTENT(in ) :: pdim ! number of ice categories
458	!!
459	INTEGER :: ji, jj, jl ! dummy loop indices
460	INTEGER :: ijpl ! number of ice categories (size of 3rd dim of input arrays)
461	REAL(wp) :: zst2, zst3
462	REAL(wp) :: zcoef_wnorm, zcoef_wnorm2, zcoef_dqlw, zcoef_dqla, zcoef_dqsb
463	REAL(wp) :: zztmp ! temporary variable
464	REAL(wp) :: zcoef_frca ! fractional cloud amount
465	REAL(wp) :: zwnorm_f, zwndi_f , zwndj_f ! relative wind module and components at F-point
466	REAL(wp) :: zwndi_t , zwndj_t ! relative wind components at T-point
467	!!
468	REAL(wp), DIMENSION(:,:) , POINTER :: z_wnds_t ! wind speed ( = \| U10m - U_ice \| ) at T-point
469	REAL(wp), DIMENSION(:,:,:), POINTER :: z_qlw ! long wave heat flux over ice
470	REAL(wp), DIMENSION(:,:,:), POINTER :: z_qsb ! sensible heat flux over ice
471	REAL(wp), DIMENSION(:,:,:), POINTER :: z_dqlw ! long wave heat sensitivity over ice
472	REAL(wp), DIMENSION(:,:,:), POINTER :: z_dqsb ! sensible heat sensitivity over ice
473	!!---------------------------------------------------------------------
474	!
475	IF( nn_timing == 1 ) CALL timing_start('blk_ice_core')
476	!
477	CALL wrk_alloc( jpi,jpj, z_wnds_t )
478	CALL wrk_alloc( jpi,jpj,pdim, z_qlw, z_qsb, z_dqlw, z_dqsb )
479
480	ijpl = pdim ! number of ice categories
481
482	! local scalars ( place there for vector optimisation purposes)
483	zcoef_wnorm = rhoa * Cice
484	zcoef_wnorm2 = rhoa * Cice * 0.5
485	zcoef_dqlw = 4.0 * 0.95 * Stef
486	zcoef_dqla = -Ls * Cice * 11637800. * (-5897.8)
487	zcoef_dqsb = rhoa * cpa * Cice
488	zcoef_frca = 1.0 - 0.3
489
490	!!gm brutal....
491	z_wnds_t(:,:) = 0.e0
492	p_taui (:,:) = 0.e0
493	p_tauj (:,:) = 0.e0
494	!!gm end
495
496	#if defined key_lim3
497	tatm_ice(:,:) = sf(jp_tair)%fnow(:,:,1) ! LIM3: make Tair available in sea-ice. WARNING allocated after call to ice_init
498	#endif
499	! ----------------------------------------------------------------------------- !
500	! Wind components and module relative to the moving ocean ( U10m - U_ice ) !
501	! ----------------------------------------------------------------------------- !
502	SELECT CASE( cd_grid )
503	CASE( 'I' ) ! B-grid ice dynamics : I-point (i.e. F-point with sea-ice indexation)
504	! and scalar wind at T-point ( = \| U10m - U_ice \| ) (masked)
505	!CDIR NOVERRCHK
506	DO jj = 2, jpjm1
507	DO ji = 2, jpim1 ! B grid : NO vector opt
508	! ... scalar wind at I-point (fld being at T-point)
509	zwndi_f = 0.25 * ( sf(jp_wndi)%fnow(ji-1,jj ,1) + sf(jp_wndi)%fnow(ji ,jj ,1) &
510	& + sf(jp_wndi)%fnow(ji-1,jj-1,1) + sf(jp_wndi)%fnow(ji ,jj-1,1) ) - rn_vfac * pui(ji,jj)
511	zwndj_f = 0.25 * ( sf(jp_wndj)%fnow(ji-1,jj ,1) + sf(jp_wndj)%fnow(ji ,jj ,1) &
512	& + sf(jp_wndj)%fnow(ji-1,jj-1,1) + sf(jp_wndj)%fnow(ji ,jj-1,1) ) - rn_vfac * pvi(ji,jj)
513	zwnorm_f = zcoef_wnorm * SQRT( zwndi_f * zwndi_f + zwndj_f * zwndj_f )
514	! ... ice stress at I-point
515	p_taui(ji,jj) = zwnorm_f * zwndi_f
516	p_tauj(ji,jj) = zwnorm_f * zwndj_f
517	! ... scalar wind at T-point (fld being at T-point)
518	zwndi_t = sf(jp_wndi)%fnow(ji,jj,1) - rn_vfac * 0.25 * ( pui(ji,jj+1) + pui(ji+1,jj+1) &
519	& + pui(ji,jj ) + pui(ji+1,jj ) )
520	zwndj_t = sf(jp_wndj)%fnow(ji,jj,1) - rn_vfac * 0.25 * ( pvi(ji,jj+1) + pvi(ji+1,jj+1) &
521	& + pvi(ji,jj ) + pvi(ji+1,jj ) )
522	z_wnds_t(ji,jj) = SQRT( zwndi_t * zwndi_t + zwndj_t * zwndj_t ) * tmask(ji,jj,1)
523	END DO
524	END DO
525	CALL lbc_lnk( p_taui , 'I', -1. )
526	CALL lbc_lnk( p_tauj , 'I', -1. )
527	CALL lbc_lnk( z_wnds_t, 'T', 1. )
528	!
529	CASE( 'C' ) ! C-grid ice dynamics : U & V-points (same as ocean)
530	#if defined key_vectopt_loop
531	!CDIR COLLAPSE
532	#endif
533	DO jj = 2, jpj
534	DO ji = fs_2, jpi ! vect. opt.
535	zwndi_t = ( sf(jp_wndi)%fnow(ji,jj,1) - rn_vfac * 0.5 * ( pui(ji-1,jj ) + pui(ji,jj) ) )
536	zwndj_t = ( sf(jp_wndj)%fnow(ji,jj,1) - rn_vfac * 0.5 * ( pvi(ji ,jj-1) + pvi(ji,jj) ) )
537	z_wnds_t(ji,jj) = SQRT( zwndi_t * zwndi_t + zwndj_t * zwndj_t ) * tmask(ji,jj,1)
538	END DO
539	END DO
540	#if defined key_vectopt_loop
541	!CDIR COLLAPSE
542	#endif
543	DO jj = 2, jpjm1
544	DO ji = fs_2, fs_jpim1 ! vect. opt.
545	p_taui(ji,jj) = zcoef_wnorm2 * ( z_wnds_t(ji+1,jj ) + z_wnds_t(ji,jj) ) &
546	& * ( 0.5 * (sf(jp_wndi)%fnow(ji+1,jj,1) + sf(jp_wndi)%fnow(ji,jj,1) ) - rn_vfac * pui(ji,jj) )
547	p_tauj(ji,jj) = zcoef_wnorm2 * ( z_wnds_t(ji,jj+1 ) + z_wnds_t(ji,jj) ) &
548	& * ( 0.5 * (sf(jp_wndj)%fnow(ji,jj+1,1) + sf(jp_wndj)%fnow(ji,jj,1) ) - rn_vfac * pvi(ji,jj) )
549	END DO
550	END DO
551	CALL lbc_lnk( p_taui , 'U', -1. )
552	CALL lbc_lnk( p_tauj , 'V', -1. )
553	CALL lbc_lnk( z_wnds_t, 'T', 1. )
554	!
555	END SELECT
556
557	zztmp = 1. / ( 1. - albo )
558	! ! ========================== !
559	DO jl = 1, ijpl ! Loop over ice categories !
560	! ! ========================== !
561	!CDIR NOVERRCHK
562	!CDIR COLLAPSE
563	DO jj = 1 , jpj
564	!CDIR NOVERRCHK
565	DO ji = 1, jpi
566	! ----------------------------!
567	! I Radiative FLUXES !
568	! ----------------------------!
569	zst2 = pst(ji,jj,jl) * pst(ji,jj,jl)
570	zst3 = pst(ji,jj,jl) * zst2
571	! Short Wave (sw)
572	p_qsr(ji,jj,jl) = zztmp * ( 1. - palb(ji,jj,jl) ) * qsr(ji,jj)
573	! Long Wave (lw)
574	! iovino
575	IF( ff(ji,jj) .GT. 0._wp ) THEN
576	z_qlw(ji,jj,jl) = ( 0.95 * sf(jp_qlw)%fnow(ji,jj,1) - Stef * pst(ji,jj,jl) * zst3 ) * tmask(ji,jj,1)
577	ELSE
578	z_qlw(ji,jj,jl) = 0.95 * ( sf(jp_qlw)%fnow(ji,jj,1) - Stef * pst(ji,jj,jl) * zst3 ) * tmask(ji,jj,1)
579	ENDIF
580	! lw sensitivity
581	z_dqlw(ji,jj,jl) = zcoef_dqlw * zst3
582
583	! ----------------------------!
584	! II Turbulent FLUXES !
585	! ----------------------------!
586
587	! ... turbulent heat fluxes
588	! Sensible Heat
589	z_qsb(ji,jj,jl) = rhoa * cpa * Cice * z_wnds_t(ji,jj) * ( pst(ji,jj,jl) - sf(jp_tair)%fnow(ji,jj,1) )
590	! Latent Heat
591	p_qla(ji,jj,jl) = rn_efac * MAX( 0.e0, rhoa * Ls * Cice * z_wnds_t(ji,jj) &
592	& * ( 11637800. * EXP( -5897.8 / pst(ji,jj,jl) ) / rhoa - sf(jp_humi)%fnow(ji,jj,1) ) )
593	! Latent heat sensitivity for ice (Dqla/Dt)
594	p_dqla(ji,jj,jl) = rn_efac * zcoef_dqla * z_wnds_t(ji,jj) / ( zst2 ) * EXP( -5897.8 / pst(ji,jj,jl) )
595	! Sensible heat sensitivity (Dqsb_ice/Dtn_ice)
596	z_dqsb(ji,jj,jl) = zcoef_dqsb * z_wnds_t(ji,jj)
597
598	! ----------------------------!
599	! III Total FLUXES !
600	! ----------------------------!
601	! Downward Non Solar flux
602	p_qns (ji,jj,jl) = z_qlw (ji,jj,jl) - z_qsb (ji,jj,jl) - p_qla (ji,jj,jl)
603	! Total non solar heat flux sensitivity for ice
604	p_dqns(ji,jj,jl) = - ( z_dqlw(ji,jj,jl) + z_dqsb(ji,jj,jl) + p_dqla(ji,jj,jl) )
605	END DO
606	!
607	END DO
608	!
609	END DO
610	!
611	!--------------------------------------------------------------------
612	! FRACTIONs of net shortwave radiation which is not absorbed in the
613	! thin surface layer and penetrates inside the ice cover
614	! ( Maykut and Untersteiner, 1971 ; Ebert and Curry, 1993 )
615
616	!CDIR COLLAPSE
617	p_fr1(:,:) = ( 0.18 * ( 1.0 - zcoef_frca ) + 0.35 * zcoef_frca )
618	!CDIR COLLAPSE
619	p_fr2(:,:) = ( 0.82 * ( 1.0 - zcoef_frca ) + 0.65 * zcoef_frca )
620
621	!CDIR COLLAPSE
622	p_tpr(:,:) = sf(jp_prec)%fnow(:,:,1) * rn_pfac ! total precipitation [kg/m2/s]
623	!CDIR COLLAPSE
624	p_spr(:,:) = sf(jp_snow)%fnow(:,:,1) * rn_pfac ! solid precipitation [kg/m2/s]
625	CALL iom_put( 'snowpre', p_spr * 86400. ) ! Snow precipitation
626	CALL iom_put( 'precip', p_tpr * 86400. ) ! Total precipitation
627	!
628	IF(ln_ctl) THEN
629	CALL prt_ctl(tab3d_1=p_qla , clinfo1=' blk_ice_core: p_qla : ', tab3d_2=z_qsb , clinfo2=' z_qsb : ', kdim=ijpl)
630	CALL prt_ctl(tab3d_1=z_qlw , clinfo1=' blk_ice_core: z_qlw : ', tab3d_2=p_dqla , clinfo2=' p_dqla : ', kdim=ijpl)
631	CALL prt_ctl(tab3d_1=z_dqsb , clinfo1=' blk_ice_core: z_dqsb : ', tab3d_2=z_dqlw , clinfo2=' z_dqlw : ', kdim=ijpl)
632	CALL prt_ctl(tab3d_1=p_dqns , clinfo1=' blk_ice_core: p_dqns : ', tab3d_2=p_qsr , clinfo2=' p_qsr : ', kdim=ijpl)
633	CALL prt_ctl(tab3d_1=pst , clinfo1=' blk_ice_core: pst : ', tab3d_2=p_qns , clinfo2=' p_qns : ', kdim=ijpl)
634	CALL prt_ctl(tab2d_1=p_tpr , clinfo1=' blk_ice_core: p_tpr : ', tab2d_2=p_spr , clinfo2=' p_spr : ')
635	CALL prt_ctl(tab2d_1=p_taui , clinfo1=' blk_ice_core: p_taui : ', tab2d_2=p_tauj , clinfo2=' p_tauj : ')
636	CALL prt_ctl(tab2d_1=z_wnds_t, clinfo1=' blk_ice_core: z_wnds_t : ')
637	ENDIF
638
639	CALL wrk_dealloc( jpi,jpj, z_wnds_t )
640	CALL wrk_dealloc( jpi,jpj,pdim, z_qlw, z_qsb, z_dqlw, z_dqsb )
641	!
642	IF( nn_timing == 1 ) CALL timing_stop('blk_ice_core')
643	!
644	END SUBROUTINE blk_ice_core
645
646
647	SUBROUTINE TURB_CORE_1Z(zu, sst, T_a, q_sat, q_a, &
648	& dU , Cd , Ch , Ce )
649	!!----------------------------------------------------------------------
650	!! * ROUTINE turb_core *
651	!!
652	!! ** Purpose : Computes turbulent transfert coefficients of surface
653	!! fluxes according to Large & Yeager (2004)
654	!!
655	!! ** 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
656	!! Momentum, Latent and sensible heat exchange coefficients
657	!! Caution: this procedure should only be used in cases when air
658	!! temperature (T_air), air specific humidity (q_air) and wind (dU)
659	!! are provided at the same height 'zzu'!
660	!!
661	!! References : Large & Yeager, 2004 : ???
662	!!----------------------------------------------------------------------
663	REAL(wp) , INTENT(in ) :: zu ! altitude of wind measurement [m]
664	REAL(wp), DIMENSION(:,:), INTENT(in ) :: sst ! sea surface temperature [Kelvin]
665	REAL(wp), DIMENSION(:,:), INTENT(in ) :: T_a ! potential air temperature [Kelvin]
666	REAL(wp), DIMENSION(:,:), INTENT(in ) :: q_sat ! sea surface specific humidity [kg/kg]
667	REAL(wp), DIMENSION(:,:), INTENT(in ) :: q_a ! specific air humidity [kg/kg]
668	REAL(wp), DIMENSION(:,:), INTENT(in ) :: dU ! wind module \|U(zu)-U(0)\| [m/s]
669	REAL(wp), DIMENSION(:,:), INTENT( out) :: Cd ! transfert coefficient for momentum (tau)
670	REAL(wp), DIMENSION(:,:), INTENT( out) :: Ch ! transfert coefficient for temperature (Q_sens)
671	REAL(wp), DIMENSION(:,:), INTENT( out) :: Ce ! transfert coefficient for evaporation (Q_lat)
672	!!
673	INTEGER :: j_itt
674	INTEGER , PARAMETER :: nb_itt = 3
675	REAL(wp), PARAMETER :: grav = 9.8 ! gravity
676	REAL(wp), PARAMETER :: kappa = 0.4 ! von Karman s constant
677
678	REAL(wp), DIMENSION(:,:), POINTER :: dU10 ! dU [m/s]
679	REAL(wp), DIMENSION(:,:), POINTER :: dT ! air/sea temperature differeence [K]
680	REAL(wp), DIMENSION(:,:), POINTER :: dq ! air/sea humidity difference [K]
681	REAL(wp), DIMENSION(:,:), POINTER :: Cd_n10 ! 10m neutral drag coefficient
682	REAL(wp), DIMENSION(:,:), POINTER :: Ce_n10 ! 10m neutral latent coefficient
683	REAL(wp), DIMENSION(:,:), POINTER :: Ch_n10 ! 10m neutral sensible coefficient
684	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd_n10 ! root square of Cd_n10
685	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd ! root square of Cd
686	REAL(wp), DIMENSION(:,:), POINTER :: T_vpot ! virtual potential temperature [K]
687	REAL(wp), DIMENSION(:,:), POINTER :: T_star ! turbulent scale of tem. fluct.
688	REAL(wp), DIMENSION(:,:), POINTER :: q_star ! turbulent humidity of temp. fluct.
689	REAL(wp), DIMENSION(:,:), POINTER :: U_star ! turb. scale of velocity fluct.
690	REAL(wp), DIMENSION(:,:), POINTER :: L ! Monin-Obukov length [m]
691	REAL(wp), DIMENSION(:,:), POINTER :: zeta ! stability parameter at height zu
692	REAL(wp), DIMENSION(:,:), POINTER :: U_n10 ! neutral wind velocity at 10m [m]
693	REAL(wp), DIMENSION(:,:), POINTER :: xlogt, xct, zpsi_h, zpsi_m
694
695	INTEGER , DIMENSION(:,:), POINTER :: stab ! 1st guess stability test integer
696	!!----------------------------------------------------------------------
697	!
698	IF( nn_timing == 1 ) CALL timing_start('TURB_CORE_1Z')
699	!
700	CALL wrk_alloc( jpi,jpj, stab ) ! integer
701	CALL wrk_alloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
702	CALL wrk_alloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta, U_n10, xlogt, xct, zpsi_h, zpsi_m )
703
704	!! * Start
705	!! Air/sea differences
706	dU10 = max(0.5, dU) ! we don't want to fall under 0.5 m/s
707	dT = T_a - sst ! assuming that T_a is allready the potential temp. at zzu
708	dq = q_a - q_sat
709	!!
710	!! Virtual potential temperature
711	T_vpot = T_a(1. + 0.608q_a)
712	!!
713	!! Neutral Drag Coefficient
714	stab = 0.5 + sign(0.5,dT) ! stable : stab = 1 ; unstable : stab = 0
715	IF ( ln_cdgw ) THEN
716	cdn_wave = cdn_wave - rsmall*(tmask(:,:,1)-1)
717	Cd_n10(:,:) = cdn_wave
718	ELSE
719	Cd_n10 = 1E-3 * ( 2.7/dU10 + 0.142 + dU10/13.09 ) ! L & Y eq. (6a)
720	ENDIF
721	sqrt_Cd_n10 = sqrt(Cd_n10)
722	Ce_n10 = 1E-3 * ( 34.6 * sqrt_Cd_n10 ) ! L & Y eq. (6b)
723	Ch_n10 = 1E-3sqrt_Cd_n10(18stab + 32.7(1-stab)) ! L & Y eq. (6c), (6d)
724	!!
725	!! Initializing transfert coefficients with their first guess neutral equivalents :
726	Cd = Cd_n10 ; Ce = Ce_n10 ; Ch = Ch_n10 ; sqrt_Cd = sqrt(Cd)
727
728	!! * Now starting iteration loop
729	DO j_itt=1, nb_itt
730	!! Turbulent scales :
731	U_star = sqrt_Cd*dU10 ! L & Y eq. (7a)
732	T_star = Ch/sqrt_Cd*dT ! L & Y eq. (7b)
733	q_star = Ce/sqrt_Cd*dq ! L & Y eq. (7c)
734
735	!! Estimate the Monin-Obukov length :
736	L = (U_star*2)/( kappagrav*(T_star/T_vpot + q_star/(q_a + 1./0.608)) )
737
738	!! Stability parameters :
739	zeta = zu/L ; zeta = sign( min(abs(zeta),10.0), zeta )
740	zpsi_h = psi_h(zeta)
741	zpsi_m = psi_m(zeta)
742
743	IF ( ln_cdgw ) THEN
744	sqrt_Cd=kappa/((kappa/sqrt_Cd_n10) - zpsi_m) ; Cd=sqrt_Cd*sqrt_Cd;
745	ELSE
746	!! Shifting the wind speed to 10m and neutral stability :
747	U_n10 = dU101./(1. + sqrt_Cd_n10/kappa(log(zu/10.) - zpsi_m)) ! L & Y eq. (9a)
748
749	!! Updating the neutral 10m transfer coefficients :
750	Cd_n10 = 1E-3 * (2.7/U_n10 + 0.142 + U_n10/13.09) ! L & Y eq. (6a)
751	sqrt_Cd_n10 = sqrt(Cd_n10)
752	Ce_n10 = 1E-3 * (34.6 * sqrt_Cd_n10) ! L & Y eq. (6b)
753	stab = 0.5 + sign(0.5,zeta)
754	Ch_n10 = 1E-3sqrt_Cd_n10(18.stab + 32.7(1-stab)) ! L & Y eq. (6c), (6d)
755
756	!! Shifting the neutral 10m transfer coefficients to ( zu , zeta ) :
757	!!
758	xct = 1. + sqrt_Cd_n10/kappa*(log(zu/10) - zpsi_m)
759	Cd = Cd_n10/(xct*xct) ; sqrt_Cd = sqrt(Cd)
760	ENDIF
761	!!
762	xlogt = log(zu/10.) - zpsi_h
763	!!
764	xct = 1. + Ch_n10*xlogt/kappa/sqrt_Cd_n10
765	Ch = Ch_n10*sqrt_Cd/sqrt_Cd_n10/xct
766	!!
767	xct = 1. + Ce_n10*xlogt/kappa/sqrt_Cd_n10
768	Ce = Ce_n10*sqrt_Cd/sqrt_Cd_n10/xct
769	!!
770	END DO
771	!!
772	CALL wrk_dealloc( jpi,jpj, stab ) ! integer
773	CALL wrk_dealloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
774	CALL wrk_dealloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta, U_n10, xlogt, xct, zpsi_h, zpsi_m )
775	!
776	IF( nn_timing == 1 ) CALL timing_stop('TURB_CORE_1Z')
777	!
778	END SUBROUTINE TURB_CORE_1Z
779
780
781	SUBROUTINE TURB_CORE_2Z(zt, zu, sst, T_zt, q_sat, q_zt, dU, Cd, Ch, Ce, T_zu, q_zu)
782	!!----------------------------------------------------------------------
783	!! * ROUTINE turb_core *
784	!!
785	!! ** Purpose : Computes turbulent transfert coefficients of surface
786	!! fluxes according to Large & Yeager (2004).
787	!!
788	!! ** 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
789	!! Momentum, Latent and sensible heat exchange coefficients
790	!! Caution: this procedure should only be used in cases when air
791	!! temperature (T_air) and air specific humidity (q_air) are at 2m
792	!! whereas wind (dU) is at 10m.
793	!!
794	!! References : Large & Yeager, 2004 : ???
795	!!----------------------------------------------------------------------
796	REAL(wp), INTENT(in ) :: zt ! height for T_zt and q_zt [m]
797	REAL(wp), INTENT(in ) :: zu ! height for dU [m]
798	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: sst ! sea surface temperature [Kelvin]
799	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: T_zt ! potential air temperature [Kelvin]
800	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: q_sat ! sea surface specific humidity [kg/kg]
801	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: q_zt ! specific air humidity [kg/kg]
802	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: dU ! relative wind module \|U(zu)-U(0)\| [m/s]
803	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: Cd ! transfer coefficient for momentum (tau)
804	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: Ch ! transfer coefficient for sensible heat (Q_sens)
805	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: Ce ! transfert coefficient for evaporation (Q_lat)
806	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: T_zu ! air temp. shifted at zu [K]
807	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: q_zu ! spec. hum. shifted at zu [kg/kg]
808
809	INTEGER :: j_itt
810	INTEGER , PARAMETER :: nb_itt = 3 ! number of itterations
811	REAL(wp), PARAMETER :: grav = 9.8 ! gravity
812	REAL(wp), PARAMETER :: kappa = 0.4 ! von Karman's constant
813
814	REAL(wp), DIMENSION(:,:), POINTER :: dU10 ! dU [m/s]
815	REAL(wp), DIMENSION(:,:), POINTER :: dT ! air/sea temperature differeence [K]
816	REAL(wp), DIMENSION(:,:), POINTER :: dq ! air/sea humidity difference [K]
817	REAL(wp), DIMENSION(:,:), POINTER :: Cd_n10 ! 10m neutral drag coefficient
818	REAL(wp), DIMENSION(:,:), POINTER :: Ce_n10 ! 10m neutral latent coefficient
819	REAL(wp), DIMENSION(:,:), POINTER :: Ch_n10 ! 10m neutral sensible coefficient
820	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd_n10 ! root square of Cd_n10
821	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd ! root square of Cd
822	REAL(wp), DIMENSION(:,:), POINTER :: T_vpot ! virtual potential temperature [K]
823	REAL(wp), DIMENSION(:,:), POINTER :: T_star ! turbulent scale of tem. fluct.
824	REAL(wp), DIMENSION(:,:), POINTER :: q_star ! turbulent humidity of temp. fluct.
825	REAL(wp), DIMENSION(:,:), POINTER :: U_star ! turb. scale of velocity fluct.
826	REAL(wp), DIMENSION(:,:), POINTER :: L ! Monin-Obukov length [m]
827	REAL(wp), DIMENSION(:,:), POINTER :: zeta_u ! stability parameter at height zu
828	REAL(wp), DIMENSION(:,:), POINTER :: zeta_t ! stability parameter at height zt
829	REAL(wp), DIMENSION(:,:), POINTER :: U_n10 ! neutral wind velocity at 10m [m]
830	REAL(wp), DIMENSION(:,:), POINTER :: xlogt, xct, zpsi_hu, zpsi_ht, zpsi_m
831
832	INTEGER , DIMENSION(:,:), POINTER :: stab ! 1st stability test integer
833	!!----------------------------------------------------------------------
834	!
835	IF( nn_timing == 1 ) CALL timing_start('TURB_CORE_2Z')
836	!
837	CALL wrk_alloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
838	CALL wrk_alloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta_u, zeta_t, U_n10 )
839	CALL wrk_alloc( jpi,jpj, xlogt, xct, zpsi_hu, zpsi_ht, zpsi_m )
840	CALL wrk_alloc( jpi,jpj, stab ) ! interger
841
842	!! Initial air/sea differences
843	dU10 = max(0.5, dU) ! we don't want to fall under 0.5 m/s
844	dT = T_zt - sst
845	dq = q_zt - q_sat
846
847	!! Neutral Drag Coefficient :
848	stab = 0.5 + sign(0.5,dT) ! stab = 1 if dT > 0 -> STABLE
849	IF( ln_cdgw ) THEN
850	cdn_wave = cdn_wave - rsmall*(tmask(:,:,1)-1)
851	Cd_n10(:,:) = cdn_wave
852	ELSE
853	Cd_n10 = 1E-3*( 2.7/dU10 + 0.142 + dU10/13.09 )
854	ENDIF
855	sqrt_Cd_n10 = sqrt(Cd_n10)
856	Ce_n10 = 1E-3( 34.6 sqrt_Cd_n10 )
857	Ch_n10 = 1E-3sqrt_Cd_n10(18stab + 32.7(1 - stab))
858
859	!! Initializing transf. coeff. with their first guess neutral equivalents :
860	Cd = Cd_n10 ; Ce = Ce_n10 ; Ch = Ch_n10 ; sqrt_Cd = sqrt(Cd)
861
862	!! Initializing z_u values with z_t values :
863	T_zu = T_zt ; q_zu = q_zt
864
865	!! * Now starting iteration loop
866	DO j_itt=1, nb_itt
867	dT = T_zu - sst ; dq = q_zu - q_sat ! Updating air/sea differences
868	T_vpot = T_zu(1. + 0.608q_zu) ! Updating virtual potential temperature at zu
869	U_star = sqrt_Cd*dU10 ! Updating turbulent scales : (L & Y eq. (7))
870	T_star = Ch/sqrt_Cd*dT !
871	q_star = Ce/sqrt_Cd*dq !
872	!!
873	L = (U_star*U_star) & ! Estimate the Monin-Obukov length at height zu
874	& / (kappagrav/T_vpot(T_star(1.+0.608q_zu) + 0.608T_zuq_star))
875	!! Stability parameters :
876	zeta_u = zu/L ; zeta_u = sign( min(abs(zeta_u),10.0), zeta_u )
877	zeta_t = zt/L ; zeta_t = sign( min(abs(zeta_t),10.0), zeta_t )
878	zpsi_hu = psi_h(zeta_u)
879	zpsi_ht = psi_h(zeta_t)
880	zpsi_m = psi_m(zeta_u)
881	!!
882	!! Shifting the wind speed to 10m and neutral stability : (L & Y eq.(9a))
883	! U_n10 = dU10/(1. + sqrt_Cd_n10/kappa*(log(zu/10.) - psi_m(zeta_u)))
884	U_n10 = dU10/(1. + sqrt_Cd_n10/kappa*(log(zu/10.) - zpsi_m))
885	!!
886	!! Shifting temperature and humidity at zu : (L & Y eq. (9b-9c))
887	! T_zu = T_zt - T_star/kappa*(log(zt/zu) + psi_h(zeta_u) - psi_h(zeta_t))
888	T_zu = T_zt - T_star/kappa*(log(zt/zu) + zpsi_hu - zpsi_ht)
889	! q_zu = q_zt - q_star/kappa*(log(zt/zu) + psi_h(zeta_u) - psi_h(zeta_t))
890	q_zu = q_zt - q_star/kappa*(log(zt/zu) + zpsi_hu - zpsi_ht)
891	!!
892	!! q_zu cannot have a negative value : forcing 0
893	stab = 0.5 + sign(0.5,q_zu) ; q_zu = stab*q_zu
894	!!
895	IF( ln_cdgw ) THEN
896	sqrt_Cd=kappa/((kappa/sqrt_Cd_n10) - zpsi_m) ; Cd=sqrt_Cd*sqrt_Cd;
897	ELSE
898	!! Updating the neutral 10m transfer coefficients :
899	Cd_n10 = 1E-3 * (2.7/U_n10 + 0.142 + U_n10/13.09) ! L & Y eq. (6a)
900	sqrt_Cd_n10 = sqrt(Cd_n10)
901	Ce_n10 = 1E-3 * (34.6 * sqrt_Cd_n10) ! L & Y eq. (6b)
902	stab = 0.5 + sign(0.5,zeta_u)
903	Ch_n10 = 1E-3sqrt_Cd_n10(18.stab + 32.7(1-stab)) ! L & Y eq. (6c-6d)
904	!!
905	!!
906	!! Shifting the neutral 10m transfer coefficients to (zu,zeta_u) :
907	xct = 1. + sqrt_Cd_n10/kappa*(log(zu/10.) - zpsi_m)
908	Cd = Cd_n10/(xct*xct) ; sqrt_Cd = sqrt(Cd)
909	ENDIF
910	!!
911	xlogt = log(zu/10.) - zpsi_hu
912	!!
913	xct = 1. + Ch_n10*xlogt/kappa/sqrt_Cd_n10
914	Ch = Ch_n10*sqrt_Cd/sqrt_Cd_n10/xct
915	!!
916	xct = 1. + Ce_n10*xlogt/kappa/sqrt_Cd_n10
917	Ce = Ce_n10*sqrt_Cd/sqrt_Cd_n10/xct
918	!!
919	!!
920	END DO
921	!!
922	CALL wrk_dealloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
923	CALL wrk_dealloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta_u, zeta_t, U_n10 )
924	CALL wrk_dealloc( jpi,jpj, xlogt, xct, zpsi_hu, zpsi_ht, zpsi_m )
925	CALL wrk_dealloc( jpi,jpj, stab ) ! interger
926	!
927	IF( nn_timing == 1 ) CALL timing_stop('TURB_CORE_2Z')
928	!
929	END SUBROUTINE TURB_CORE_2Z
930
931
932	FUNCTION psi_m(zta) !! Psis, L & Y eq. (8c), (8d), (8e)
933	!-------------------------------------------------------------------------------
934	REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: zta
935
936	REAL(wp), PARAMETER :: pi = 3.141592653589793_wp
937	REAL(wp), DIMENSION(jpi,jpj) :: psi_m
938	REAL(wp), DIMENSION(:,:), POINTER :: X2, X, stabit
939	!-------------------------------------------------------------------------------
940
941	CALL wrk_alloc( jpi,jpj, X2, X, stabit )
942
943	X2 = sqrt(abs(1. - 16.*zta)) ; X2 = max(X2 , 1.0) ; X = sqrt(X2)
944	stabit = 0.5 + sign(0.5,zta)
945	psi_m = -5.ztastabit & ! Stable
946	& + (1. - stabit)(2log((1. + X)/2) + log((1. + X2)/2) - 2*atan(X) + pi/2) ! Unstable
947
948	CALL wrk_dealloc( jpi,jpj, X2, X, stabit )
949	!
950	END FUNCTION psi_m
951
952
953	FUNCTION psi_h( zta ) !! Psis, L & Y eq. (8c), (8d), (8e)
954	!-------------------------------------------------------------------------------
955	REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: zta
956	!
957	REAL(wp), DIMENSION(jpi,jpj) :: psi_h
958	REAL(wp), DIMENSION(:,:), POINTER :: X2, X, stabit
959	!-------------------------------------------------------------------------------
960
961	CALL wrk_alloc( jpi,jpj, X2, X, stabit )
962
963	X2 = sqrt(abs(1. - 16.*zta)) ; X2 = max(X2 , 1.) ; X = sqrt(X2)
964	stabit = 0.5 + sign(0.5,zta)
965	psi_h = -5.ztastabit & ! Stable
966	& + (1. - stabit)(2.log( (1. + X2)/2. )) ! Unstable
967
968	CALL wrk_dealloc( jpi,jpj, X2, X, stabit )
969	!
970	END FUNCTION psi_h
971
972	!!======================================================================
973	END MODULE sbcblk_core

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