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sbcblk_core.F90 in branches/2011/dev_NEMO_MERGE_2011/NEMOGCM/NEMO/OPA_SRC/SBC – NEMO

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source: branches/2011/dev_NEMO_MERGE_2011/NEMOGCM/NEMO/OPA_SRC/SBC/sbcblk_core.F90 @ 3186

Last change on this file since 3186 was 3186, checked in by smasson, 12 years ago
dev_NEMO_MERGE_2011: replace the old wrk_nemo with the new wrk_nemo
Property svn:keywords set to `Id`
File size: 52.4 KB

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

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