New URL for NEMO forge! http://forge.nemo-ocean.eu

Since March 2022 along with NEMO 4.2 release, the code development moved to a self-hosted GitLab.
This present forge is now archived and remained online for history.

sbcblk_core.F90 in branches/2011/dev_MERCATOR_INGV_2011_MERGE/NEMOGCM/NEMO/OPA_SRC/SBC – NEMO

Context Navigation

source: branches/2011/dev_MERCATOR_INGV_2011_MERGE/NEMOGCM/NEMO/OPA_SRC/SBC/sbcblk_core.F90 @ 3085

Last change on this file since 3085 was 3085, checked in by cbricaud, 12 years ago
commit changes from dev_INGV_2011
Property svn:keywords set to `Id`
File size: 53.0 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	!!----------------------------------------------------------------------
17
18	!!----------------------------------------------------------------------
19	!! sbc_blk_core : bulk formulation as ocean surface boundary condition
20	!! (forced mode, CORE bulk formulea)
21	!! blk_oce_core : ocean: computes momentum, heat and freshwater fluxes
22	!! blk_ice_core : ice : computes momentum, heat and freshwater fluxes
23	!! turb_core : computes the CORE turbulent transfer coefficients
24	!!----------------------------------------------------------------------
25	USE oce ! ocean dynamics and tracers
26	USE dom_oce ! ocean space and time domain
27	USE phycst ! physical constants
28	USE fldread ! read input fields
29	USE sbc_oce ! Surface boundary condition: ocean fields
30	USE sbcdcy ! surface boundary condition: diurnal cycle
31	USE iom ! I/O manager library
32	USE in_out_manager ! I/O manager
33	USE lib_mpp ! distribued memory computing library
34	USE lbclnk ! ocean lateral boundary conditions (or mpp link)
35	USE prtctl ! Print control
36	USE sbcwave,ONLY : cdn_wave !wave module
37	#if defined key_lim3
38	USE sbc_ice ! Surface boundary condition: ice fields
39	#endif
40
41	IMPLICIT NONE
42	PRIVATE
43
44	PUBLIC sbc_blk_core ! routine called in sbcmod module
45	PUBLIC blk_ice_core ! routine called in sbc_ice_lim module
46	PUBLIC turb_core_2z ! routine calles in sbcblk_ecmwf module
47
48	INTEGER , PARAMETER :: jpfld = 9 ! maximum number of files to read
49	INTEGER , PARAMETER :: jp_wndi = 1 ! index of 10m wind velocity (i-component) (m/s) at T-point
50	INTEGER , PARAMETER :: jp_wndj = 2 ! index of 10m wind velocity (j-component) (m/s) at T-point
51	INTEGER , PARAMETER :: jp_humi = 3 ! index of specific humidity ( - )
52	INTEGER , PARAMETER :: jp_qsr = 4 ! index of solar heat (W/m2)
53	INTEGER , PARAMETER :: jp_qlw = 5 ! index of Long wave (W/m2)
54	INTEGER , PARAMETER :: jp_tair = 6 ! index of 10m air temperature (Kelvin)
55	INTEGER , PARAMETER :: jp_prec = 7 ! index of total precipitation (rain+snow) (Kg/m2/s)
56	INTEGER , PARAMETER :: jp_snow = 8 ! index of snow (solid prcipitation) (kg/m2/s)
57	INTEGER , PARAMETER :: jp_tdif = 9 ! index of tau diff associated to HF tau (N/m2) at T-point
58
59	TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf ! structure of input fields (file informations, fields read)
60
61	! !!! CORE bulk parameters
62	REAL(wp), PARAMETER :: rhoa = 1.22 ! air density
63	REAL(wp), PARAMETER :: cpa = 1000.5 ! specific heat of air
64	REAL(wp), PARAMETER :: Lv = 2.5e6 ! latent heat of vaporization
65	REAL(wp), PARAMETER :: Ls = 2.839e6 ! latent heat of sublimation
66	REAL(wp), PARAMETER :: Stef = 5.67e-8 ! Stefan Boltzmann constant
67	REAL(wp), PARAMETER :: Cice = 1.63e-3 ! transfer coefficient over ice
68	REAL(wp), PARAMETER :: albo = 0.066 ! ocean albedo assumed to be contant
69
70	! !!* Namelist namsbc_core : CORE bulk parameters
71	LOGICAL :: ln_2m = .FALSE. ! logical flag for height of air temp. and hum
72	LOGICAL :: ln_taudif = .FALSE. ! logical flag to use the "mean of stress module - module of mean stress" data
73	REAL(wp) :: rn_pfac = 1. ! multiplication factor for precipitation
74
75	!! * Substitutions
76	# include "domzgr_substitute.h90"
77	# include "vectopt_loop_substitute.h90"
78	!!----------------------------------------------------------------------
79	!! NEMO/OPA 3.3 , NEMO-consortium (2010)
80	!! $Id$
81	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
82	!!----------------------------------------------------------------------
83	CONTAINS
84
85	SUBROUTINE sbc_blk_core( kt )
86	!!---------------------------------------------------------------------
87	!! * ROUTINE sbc_blk_core *
88	!!
89	!! ** Purpose : provide at each time step the surface ocean fluxes
90	!! (momentum, heat, freshwater and runoff)
91	!!
92	!! ** Method : (1) READ each fluxes in NetCDF files:
93	!! the 10m wind velocity (i-component) (m/s) at T-point
94	!! the 10m wind velocity (j-component) (m/s) at T-point
95	!! the specific humidity ( - )
96	!! the solar heat (W/m2)
97	!! the Long wave (W/m2)
98	!! the 10m air temperature (Kelvin)
99	!! the total precipitation (rain+snow) (Kg/m2/s)
100	!! the snow (solid prcipitation) (kg/m2/s)
101	!! OPTIONAL parameter (see ln_taudif namelist flag):
102	!! the tau diff associated to HF tau (N/m2) at T-point
103	!! (2) CALL blk_oce_core
104	!!
105	!! C A U T I O N : never mask the surface stress fields
106	!! the stress is assumed to be in the mesh referential
107	!! i.e. the (i,j) referential
108	!!
109	!! ** Action : defined at each time-step at the air-sea interface
110	!! - utau, vtau i- and j-component of the wind stress
111	!! - taum wind stress module at T-point
112	!! - wndm 10m wind module at T-point
113	!! - qns, qsr non-slor and solar heat flux
114	!! - emp, emps evaporation minus precipitation
115	!!----------------------------------------------------------------------
116	INTEGER, INTENT(in) :: kt ! ocean time step
117	!!
118	INTEGER :: ierror ! return error code
119	INTEGER :: ifpr ! dummy loop indice
120	INTEGER :: jfld ! dummy loop arguments
121	!!
122	CHARACTER(len=100) :: cn_dir ! Root directory for location of core files
123	TYPE(FLD_N), DIMENSION(jpfld) :: slf_i ! array of namelist informations on the fields to read
124	TYPE(FLD_N) :: sn_wndi, sn_wndj, sn_humi, sn_qsr ! informations about the fields to be read
125	TYPE(FLD_N) :: sn_qlw , sn_tair, sn_prec, sn_snow ! " "
126	TYPE(FLD_N) :: sn_tdif ! " "
127	NAMELIST/namsbc_core/ cn_dir , ln_2m , ln_taudif, rn_pfac, &
128	& sn_wndi, sn_wndj, sn_humi , sn_qsr , &
129	& sn_qlw , sn_tair, sn_prec , sn_snow, sn_tdif
130	!!---------------------------------------------------------------------
131
132	! ! ====================== !
133	IF( kt == nit000 ) THEN ! First call kt=nit000 !
134	! ! ====================== !
135	! set file information (default values)
136	cn_dir = './' ! directory in which the model is executed
137	!
138	! (NB: frequency positive => hours, negative => months)
139	! ! file ! frequency ! variable ! time intep ! clim ! 'yearly' or ! weights ! rotation !
140	! ! name ! (hours) ! name ! (T/F) ! (T/F) ! 'monthly' ! filename ! pairs !
141	sn_wndi = FLD_N( 'uwnd10m', 24 , 'u_10' , .false. , .false. , 'yearly' , '' , '' )
142	sn_wndj = FLD_N( 'vwnd10m', 24 , 'v_10' , .false. , .false. , 'yearly' , '' , '' )
143	sn_qsr = FLD_N( 'qsw' , 24 , 'qsw' , .false. , .false. , 'yearly' , '' , '' )
144	sn_qlw = FLD_N( 'qlw' , 24 , 'qlw' , .false. , .false. , 'yearly' , '' , '' )
145	sn_tair = FLD_N( 'tair10m', 24 , 't_10' , .false. , .false. , 'yearly' , '' , '' )
146	sn_humi = FLD_N( 'humi10m', 24 , 'q_10' , .false. , .false. , 'yearly' , '' , '' )
147	sn_prec = FLD_N( 'precip' , -1 , 'precip' , .true. , .false. , 'yearly' , '' , '' )
148	sn_snow = FLD_N( 'snow' , -1 , 'snow' , .true. , .false. , 'yearly' , '' , '' )
149	sn_tdif = FLD_N( 'taudif' , 24 , 'taudif' , .true. , .false. , 'yearly' , '' , '' )
150	!
151	REWIND( numnam ) ! read in namlist namsbc_core
152	READ ( numnam, namsbc_core )
153	! ! check: do we plan to use ln_dm2dc with non-daily forcing?
154	IF( ln_dm2dc .AND. sn_qsr%nfreqh /= 24 ) &
155	& CALL ctl_stop( 'sbc_blk_core: ln_dm2dc can be activated only with daily short-wave forcing' )
156	IF( ln_dm2dc .AND. sn_qsr%ln_tint ) THEN
157	CALL ctl_warn( 'sbc_blk_core: ln_dm2dc is taking care of the temporal interpolation of daily qsr', &
158	& ' ==> We force time interpolation = .false. for qsr' )
159	sn_qsr%ln_tint = .false.
160	ENDIF
161	! ! store namelist information in an array
162	slf_i(jp_wndi) = sn_wndi ; slf_i(jp_wndj) = sn_wndj
163	slf_i(jp_qsr ) = sn_qsr ; slf_i(jp_qlw ) = sn_qlw
164	slf_i(jp_tair) = sn_tair ; slf_i(jp_humi) = sn_humi
165	slf_i(jp_prec) = sn_prec ; slf_i(jp_snow) = sn_snow
166	slf_i(jp_tdif) = sn_tdif
167	!
168	lhftau = ln_taudif ! do we use HF tau information?
169	jfld = jpfld - COUNT( (/.NOT. lhftau/) )
170	!
171	ALLOCATE( sf(jfld), STAT=ierror ) ! set sf structure
172	IF( ierror > 0 ) CALL ctl_stop( 'STOP', 'sbc_blk_core: unable to allocate sf structure' )
173	DO ifpr= 1, jfld
174	ALLOCATE( sf(ifpr)%fnow(jpi,jpj,1) )
175	IF( slf_i(ifpr)%ln_tint ) ALLOCATE( sf(ifpr)%fdta(jpi,jpj,1,2) )
176	END DO
177	! ! fill sf with slf_i and control print
178	CALL fld_fill( sf, slf_i, cn_dir, 'sbc_blk_core', 'flux formulation for ocean surface boundary condition', 'namsbc_core' )
179	!
180	ENDIF
181
182	CALL fld_read( kt, nn_fsbc, sf ) ! input fields provided at the current time-step
183
184	! ! surface ocean fluxes computed with CLIO bulk formulea
185	IF( MOD( kt - 1, nn_fsbc ) == 0 ) CALL blk_oce_core( sf, sst_m, ssu_m, ssv_m )
186	!
187	END SUBROUTINE sbc_blk_core
188
189
190	SUBROUTINE blk_oce_core( sf, pst, pu, pv )
191	!!---------------------------------------------------------------------
192	!! * ROUTINE blk_core *
193	!!
194	!! ** Purpose : provide the momentum, heat and freshwater fluxes at
195	!! the ocean surface at each time step
196	!!
197	!! ** Method : CORE bulk formulea for the ocean using atmospheric
198	!! fields read in sbc_read
199	!!
200	!! ** Outputs : - utau : i-component of the stress at U-point (N/m2)
201	!! - vtau : j-component of the stress at V-point (N/m2)
202	!! - taum : Wind stress module at T-point (N/m2)
203	!! - wndm : Wind speed module at T-point (m/s)
204	!! - qsr : Solar heat flux over the ocean (W/m2)
205	!! - qns : Non Solar heat flux over the ocean (W/m2)
206	!! - evap : Evaporation over the ocean (kg/m2/s)
207	!! - emp(s) : evaporation minus precipitation (kg/m2/s)
208	!!
209	!! ** Nota : sf has to be a dummy argument for AGRIF on NEC
210	!!---------------------------------------------------------------------
211	USE wrk_nemo, ONLY: wrk_in_use, wrk_not_released
212	USE wrk_nemo, ONLY: zwnd_i => wrk_2d_1 , zwnd_j => wrk_2d_2 ! wind speed components at T-point
213	USE wrk_nemo, ONLY: zqsatw => wrk_2d_3 ! specific humidity at pst
214	USE wrk_nemo, ONLY: zqlw => wrk_2d_4 , zqsb => wrk_2d_5 ! long wave and sensible heat fluxes
215	USE wrk_nemo, ONLY: zqla => wrk_2d_6 , zevap => wrk_2d_7 ! latent heat fluxes and evaporation
216	USE wrk_nemo, ONLY: Cd => wrk_2d_8 ! transfer coefficient for momentum (tau)
217	USE wrk_nemo, ONLY: Ch => wrk_2d_9 ! transfer coefficient for sensible heat (Q_sens)
218	USE wrk_nemo, ONLY: Ce => wrk_2d_10 ! transfer coefficient for evaporation (Q_lat)
219	USE wrk_nemo, ONLY: zst => wrk_2d_11 ! surface temperature in Kelvin
220	USE wrk_nemo, ONLY: zt_zu => wrk_2d_12 ! air temperature at wind speed height
221	USE wrk_nemo, ONLY: zq_zu => wrk_2d_13 ! air spec. hum. at wind speed height
222	!
223	TYPE(fld), INTENT(in), DIMENSION(:) :: sf ! input data
224	REAL(wp) , INTENT(in), DIMENSION(:,:) :: pst ! surface temperature [Celcius]
225	REAL(wp) , INTENT(in), DIMENSION(:,:) :: pu ! surface current at U-point (i-component) [m/s]
226	REAL(wp) , INTENT(in), DIMENSION(:,:) :: pv ! surface current at V-point (j-component) [m/s]
227	!
228	INTEGER :: ji, jj ! dummy loop indices
229	REAL(wp) :: zcoef_qsatw, zztmp ! local variable
230	!!---------------------------------------------------------------------
231
232	IF( wrk_in_use(2, 1,2,3,4,5,6,7,8,9,10,11,12,13) ) THEN
233	CALL ctl_stop('blk_oce_core: requested workspace arrays unavailable') ; RETURN
234	ENDIF
235	!
236	! local scalars ( place there for vector optimisation purposes)
237	zcoef_qsatw = 0.98 * 640380. / rhoa
238
239	zst(:,:) = pst(:,:) + rt0 ! converte Celcius to Kelvin (and set minimum value far above 0 K)
240
241	! ----------------------------------------------------------------------------- !
242	! 0 Wind components and module at T-point relative to the moving ocean !
243	! ----------------------------------------------------------------------------- !
244
245	! ... components ( U10m - U_oce ) at T-point (unmasked)
246	zwnd_i(:,:) = 0.e0
247	zwnd_j(:,:) = 0.e0
248	#if defined key_vectopt_loop
249	!CDIR COLLAPSE
250	#endif
251	DO jj = 2, jpjm1
252	DO ji = fs_2, fs_jpim1 ! vect. opt.
253	zwnd_i(ji,jj) = ( sf(jp_wndi)%fnow(ji,jj,1) - 0.5 * ( pu(ji-1,jj ) + pu(ji,jj) ) )
254	zwnd_j(ji,jj) = ( sf(jp_wndj)%fnow(ji,jj,1) - 0.5 * ( pv(ji ,jj-1) + pv(ji,jj) ) )
255	END DO
256	END DO
257	CALL lbc_lnk( zwnd_i(:,:) , 'T', -1. )
258	CALL lbc_lnk( zwnd_j(:,:) , 'T', -1. )
259	! ... scalar wind ( = \| U10m - U_oce \| ) at T-point (masked)
260	!CDIR NOVERRCHK
261	!CDIR COLLAPSE
262	wndm(:,:) = SQRT( zwnd_i(:,:) * zwnd_i(:,:) &
263	& + zwnd_j(:,:) * zwnd_j(:,:) ) * tmask(:,:,1)
264
265	! ----------------------------------------------------------------------------- !
266	! I Radiative FLUXES !
267	! ----------------------------------------------------------------------------- !
268
269	! ocean albedo assumed to be constant + modify now Qsr to include the diurnal cycle ! Short Wave
270	zztmp = 1. - albo
271	IF( ln_dm2dc ) THEN ; qsr(:,:) = zztmp * sbc_dcy( sf(jp_qsr)%fnow(:,:,1) ) * tmask(:,:,1)
272	ELSE ; qsr(:,:) = zztmp * sf(jp_qsr)%fnow(:,:,1) * tmask(:,:,1)
273	ENDIF
274	!CDIR COLLAPSE
275	zqlw(:,:) = ( sf(jp_qlw)%fnow(:,:,1) - Stef * zst(:,:)zst(:,:)zst(:,:)zst(:,:) ) tmask(:,:,1) ! Long Wave
276	! ----------------------------------------------------------------------------- !
277	! II Turbulent FLUXES !
278	! ----------------------------------------------------------------------------- !
279
280	! ... specific humidity at SST and IST
281	!CDIR NOVERRCHK
282	!CDIR COLLAPSE
283	zqsatw(:,:) = zcoef_qsatw * EXP( -5107.4 / zst(:,:) )
284
285	! ... NCAR Bulk formulae, computation of Cd, Ch, Ce at T-point :
286	IF( ln_2m ) THEN
287	!! If air temp. and spec. hum. are given at different height (2m) than wind (10m) :
288	CALL TURB_CORE_2Z(2.,10., zst , sf(jp_tair)%fnow, &
289	& zqsatw, sf(jp_humi)%fnow, wndm, &
290	& Cd , Ch , Ce , &
291	& zt_zu , zq_zu )
292	ELSE
293	!! If air temp. and spec. hum. are given at same height than wind (10m) :
294	!gm bug? at the compiling phase, add a copy in temporary arrays... ==> check perf
295	! CALL TURB_CORE_1Z( 10., zst (:,:), sf(jp_tair)%fnow(:,:), &
296	! & zqsatw(:,:), sf(jp_humi)%fnow(:,:), wndm(:,:), &
297	! & Cd (:,:), Ch (:,:), Ce (:,:) )
298	!gm bug
299	! ARPDBG - this won't compile with gfortran. Fix but check performance
300	! as per comment above.
301	CALL TURB_CORE_1Z( 10., zst , sf(jp_tair)%fnow(:,:,1), &
302	& zqsatw, sf(jp_humi)%fnow(:,:,1), wndm, &
303	& Cd , Ch , Ce )
304	ENDIF
305
306	! ... tau module, i and j component
307	DO jj = 1, jpj
308	DO ji = 1, jpi
309	zztmp = rhoa * wndm(ji,jj) * Cd(ji,jj)
310	taum (ji,jj) = zztmp * wndm (ji,jj)
311	zwnd_i(ji,jj) = zztmp * zwnd_i(ji,jj)
312	zwnd_j(ji,jj) = zztmp * zwnd_j(ji,jj)
313	END DO
314	END DO
315
316	! ... add the HF tau contribution to the wind stress module?
317	IF( lhftau ) THEN
318	!CDIR COLLAPSE
319	taum(:,:) = taum(:,:) + sf(jp_tdif)%fnow(:,:,1)
320	ENDIF
321	CALL iom_put( "taum_oce", taum ) ! output wind stress module
322
323	! ... utau, vtau at U- and V_points, resp.
324	! Note the use of 0.5*(2-umask) in order to unmask the stress along coastlines
325	DO jj = 1, jpjm1
326	DO ji = 1, fs_jpim1
327	utau(ji,jj) = 0.5 * ( 2. - umask(ji,jj,1) ) * ( zwnd_i(ji,jj) + zwnd_i(ji+1,jj ) )
328	vtau(ji,jj) = 0.5 * ( 2. - vmask(ji,jj,1) ) * ( zwnd_j(ji,jj) + zwnd_j(ji ,jj+1) )
329	END DO
330	END DO
331	CALL lbc_lnk( utau(:,:), 'U', -1. )
332	CALL lbc_lnk( vtau(:,:), 'V', -1. )
333
334	! Turbulent fluxes over ocean
335	! -----------------------------
336	IF( ln_2m ) THEN
337	! Values of temp. and hum. adjusted to 10m must be used instead of 2m values
338	zevap(:,:) = MAX( 0.e0, rhoa Ce(:,:)( zqsatw(:,:) - zq_zu(:,:) ) * wndm(:,:) ) ! Evaporation
339	zqsb (:,:) = rhoacpaCh(:,:)( zst (:,:) - zt_zu(:,:) ) wndm(:,:) ! Sensible Heat
340	ELSE
341	!CDIR COLLAPSE
342	zevap(:,:) = MAX( 0.e0, rhoa Ce(:,:)( zqsatw(:,:) - sf(jp_humi)%fnow(:,:,1) ) * wndm(:,:) ) ! Evaporation
343	!CDIR COLLAPSE
344	zqsb (:,:) = rhoacpaCh(:,:)( zst (:,:) - sf(jp_tair)%fnow(:,:,1) ) wndm(:,:) ! Sensible Heat
345	ENDIF
346	!CDIR COLLAPSE
347	zqla (:,:) = Lv * zevap(:,:) ! Latent Heat
348
349	IF(ln_ctl) THEN
350	CALL prt_ctl( tab2d_1=zqla , clinfo1=' blk_oce_core: zqla : ', tab2d_2=Ce , clinfo2=' Ce : ' )
351	CALL prt_ctl( tab2d_1=zqsb , clinfo1=' blk_oce_core: zqsb : ', tab2d_2=Ch , clinfo2=' Ch : ' )
352	CALL prt_ctl( tab2d_1=zqlw , clinfo1=' blk_oce_core: zqlw : ', tab2d_2=qsr, clinfo2=' qsr : ' )
353	CALL prt_ctl( tab2d_1=zqsatw, clinfo1=' blk_oce_core: zqsatw : ', tab2d_2=zst, clinfo2=' zst : ' )
354	CALL prt_ctl( tab2d_1=utau , clinfo1=' blk_oce_core: utau : ', mask1=umask, &
355	& tab2d_2=vtau , clinfo2= ' vtau : ' , mask2=vmask )
356	CALL prt_ctl( tab2d_1=wndm , clinfo1=' blk_oce_core: wndm : ')
357	CALL prt_ctl( tab2d_1=zst , clinfo1=' blk_oce_core: zst : ')
358	ENDIF
359
360	! ----------------------------------------------------------------------------- !
361	! III Total FLUXES !
362	! ----------------------------------------------------------------------------- !
363
364	!CDIR COLLAPSE
365	qns(:,:) = zqlw(:,:) - zqsb(:,:) - zqla(:,:) ! Downward Non Solar flux
366	!CDIR COLLAPSE
367	emp(:,:) = zevap(:,:) - sf(jp_prec)%fnow(:,:,1) * rn_pfac * tmask(:,:,1)
368	!CDIR COLLAPSE
369	emps(:,:) = emp(:,:)
370	!
371	CALL iom_put( "qlw_oce", zqlw ) ! output downward longwave heat over the ocean
372	CALL iom_put( "qsb_oce", - zqsb ) ! output downward sensible heat over the ocean
373	CALL iom_put( "qla_oce", - zqla ) ! output downward latent heat over the ocean
374	CALL iom_put( "qns_oce", qns ) ! output downward non solar heat over the ocean
375	!
376	IF(ln_ctl) THEN
377	CALL prt_ctl(tab2d_1=zqsb , clinfo1=' blk_oce_core: zqsb : ', tab2d_2=zqlw , clinfo2=' zqlw : ')
378	CALL prt_ctl(tab2d_1=zqla , clinfo1=' blk_oce_core: zqla : ', tab2d_2=qsr , clinfo2=' qsr : ')
379	CALL prt_ctl(tab2d_1=pst , clinfo1=' blk_oce_core: pst : ', tab2d_2=emp , clinfo2=' emp : ')
380	CALL prt_ctl(tab2d_1=utau , clinfo1=' blk_oce_core: utau : ', mask1=umask, &
381	& tab2d_2=vtau , clinfo2= ' vtau : ' , mask2=vmask )
382	ENDIF
383	!
384	IF( wrk_not_released(2, 1,2,3,4,5,6,7,8,9,10,11,12,13) ) &
385	CALL ctl_stop('blk_oce_core: failed to release workspace arrays')
386	!
387	END SUBROUTINE blk_oce_core
388
389
390	SUBROUTINE blk_ice_core( pst , pui , pvi , palb , &
391	& p_taui, p_tauj, p_qns , p_qsr, &
392	& p_qla , p_dqns, p_dqla, &
393	& p_tpr , p_spr , &
394	& p_fr1 , p_fr2 , cd_grid, pdim )
395	!!---------------------------------------------------------------------
396	!! * ROUTINE blk_ice_core *
397	!!
398	!! ** Purpose : provide the surface boundary condition over sea-ice
399	!!
400	!! ** Method : compute momentum, heat and freshwater exchanged
401	!! between atmosphere and sea-ice using CORE bulk
402	!! formulea, ice variables and read atmmospheric fields.
403	!! NB: ice drag coefficient is assumed to be a constant
404	!!
405	!! caution : the net upward water flux has with mm/day unit
406	!!---------------------------------------------------------------------
407	USE wrk_nemo, ONLY: wrk_in_use, wrk_not_released
408	USE wrk_nemo, ONLY: z_wnds_t => wrk_2d_1 ! wind speed ( = \| U10m - U_ice \| ) at T-point
409	USE wrk_nemo, ONLY: wrk_3d_4 , wrk_3d_5 , wrk_3d_6 , wrk_3d_7
410	!!
411	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: pst ! ice surface temperature (>0, =rt0 over land) [Kelvin]
412	REAL(wp), DIMENSION(:,:) , INTENT(in ) :: pui ! ice surface velocity (i- and i- components [m/s]
413	REAL(wp), DIMENSION(:,:) , INTENT(in ) :: pvi ! at I-point (B-grid) or U & V-point (C-grid)
414	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: palb ! ice albedo (clear sky) (alb_ice_cs) [%]
415	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_taui ! i- & j-components of surface ice stress [N/m2]
416	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_tauj ! at I-point (B-grid) or U & V-point (C-grid)
417	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qns ! non solar heat flux over ice (T-point) [W/m2]
418	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qsr ! solar heat flux over ice (T-point) [W/m2]
419	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qla ! latent heat flux over ice (T-point) [W/m2]
420	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_dqns ! non solar heat sensistivity (T-point) [W/m2]
421	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_dqla ! latent heat sensistivity (T-point) [W/m2]
422	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_tpr ! total precipitation (T-point) [Kg/m2/s]
423	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_spr ! solid precipitation (T-point) [Kg/m2/s]
424	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_fr1 ! 1sr fraction of qsr penetration in ice (T-point) [%]
425	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_fr2 ! 2nd fraction of qsr penetration in ice (T-point) [%]
426	CHARACTER(len=1) , INTENT(in ) :: cd_grid ! ice grid ( C or B-grid)
427	INTEGER , INTENT(in ) :: pdim ! number of ice categories
428	!!
429	INTEGER :: ji, jj, jl ! dummy loop indices
430	INTEGER :: ijpl ! number of ice categories (size of 3rd dim of input arrays)
431	REAL(wp) :: zst2, zst3
432	REAL(wp) :: zcoef_wnorm, zcoef_wnorm2, zcoef_dqlw, zcoef_dqla, zcoef_dqsb
433	REAL(wp) :: zztmp ! temporary variable
434	REAL(wp) :: zcoef_frca ! fractional cloud amount
435	REAL(wp) :: zwnorm_f, zwndi_f , zwndj_f ! relative wind module and components at F-point
436	REAL(wp) :: zwndi_t , zwndj_t ! relative wind components at T-point
437	!!
438	REAL(wp), DIMENSION(:,:,:), POINTER :: z_qlw ! long wave heat flux over ice
439	REAL(wp), DIMENSION(:,:,:), POINTER :: z_qsb ! sensible heat flux over ice
440	REAL(wp), DIMENSION(:,:,:), POINTER :: z_dqlw ! long wave heat sensitivity over ice
441	REAL(wp), DIMENSION(:,:,:), POINTER :: z_dqsb ! sensible heat sensitivity over ice
442	!!---------------------------------------------------------------------
443
444	ijpl = pdim ! number of ice categories
445
446	! Set-up access to workspace arrays
447	IF( wrk_in_use(2, 1) .OR. wrk_in_use(3, 4,5,6,7) ) THEN
448	CALL ctl_stop('blk_ice_core: requested workspace arrays unavailable') ; RETURN
449	ELSE IF(ijpl > jpk) THEN
450	CALL ctl_stop('blk_ice_core: no. of ice categories > jpk so wrk_nemo 3D workspaces cannot be used.')
451	RETURN
452	END IF
453	! Set-up pointers to sub-arrays of workspaces
454	z_qlw => wrk_3d_4(:,:,1:ijpl)
455	z_qsb => wrk_3d_5(:,:,1:ijpl)
456	z_dqlw => wrk_3d_6(:,:,1:ijpl)
457	z_dqsb => wrk_3d_7(:,:,1:ijpl)
458
459	! local scalars ( place there for vector optimisation purposes)
460	zcoef_wnorm = rhoa * Cice
461	zcoef_wnorm2 = rhoa * Cice * 0.5
462	zcoef_dqlw = 4.0 * 0.95 * Stef
463	zcoef_dqla = -Ls * Cice * 11637800. * (-5897.8)
464	zcoef_dqsb = rhoa * cpa * Cice
465	zcoef_frca = 1.0 - 0.3
466
467	!!gm brutal....
468	z_wnds_t(:,:) = 0.e0
469	p_taui (:,:) = 0.e0
470	p_tauj (:,:) = 0.e0
471	!!gm end
472
473	#if defined key_lim3
474	tatm_ice(:,:) = sf(jp_tair)%fnow(:,:,1) ! LIM3: make Tair available in sea-ice. WARNING allocated after call to ice_init
475	#endif
476	! ----------------------------------------------------------------------------- !
477	! Wind components and module relative to the moving ocean ( U10m - U_ice ) !
478	! ----------------------------------------------------------------------------- !
479	SELECT CASE( cd_grid )
480	CASE( 'I' ) ! B-grid ice dynamics : I-point (i.e. F-point with sea-ice indexation)
481	! and scalar wind at T-point ( = \| U10m - U_ice \| ) (masked)
482	!CDIR NOVERRCHK
483	DO jj = 2, jpjm1
484	DO ji = 2, jpim1 ! B grid : NO vector opt
485	! ... scalar wind at I-point (fld being at T-point)
486	zwndi_f = 0.25 * ( sf(jp_wndi)%fnow(ji-1,jj ,1) + sf(jp_wndi)%fnow(ji ,jj ,1) &
487	& + sf(jp_wndi)%fnow(ji-1,jj-1,1) + sf(jp_wndi)%fnow(ji ,jj-1,1) ) - pui(ji,jj)
488	zwndj_f = 0.25 * ( sf(jp_wndj)%fnow(ji-1,jj ,1) + sf(jp_wndj)%fnow(ji ,jj ,1) &
489	& + sf(jp_wndj)%fnow(ji-1,jj-1,1) + sf(jp_wndj)%fnow(ji ,jj-1,1) ) - pvi(ji,jj)
490	zwnorm_f = zcoef_wnorm * SQRT( zwndi_f * zwndi_f + zwndj_f * zwndj_f )
491	! ... ice stress at I-point
492	p_taui(ji,jj) = zwnorm_f * zwndi_f
493	p_tauj(ji,jj) = zwnorm_f * zwndj_f
494	! ... scalar wind at T-point (fld being at T-point)
495	zwndi_t = sf(jp_wndi)%fnow(ji,jj,1) - 0.25 * ( pui(ji,jj+1) + pui(ji+1,jj+1) &
496	& + pui(ji,jj ) + pui(ji+1,jj ) )
497	zwndj_t = sf(jp_wndj)%fnow(ji,jj,1) - 0.25 * ( pvi(ji,jj+1) + pvi(ji+1,jj+1) &
498	& + pvi(ji,jj ) + pvi(ji+1,jj ) )
499	z_wnds_t(ji,jj) = SQRT( zwndi_t * zwndi_t + zwndj_t * zwndj_t ) * tmask(ji,jj,1)
500	END DO
501	END DO
502	CALL lbc_lnk( p_taui , 'I', -1. )
503	CALL lbc_lnk( p_tauj , 'I', -1. )
504	CALL lbc_lnk( z_wnds_t, 'T', 1. )
505	!
506	CASE( 'C' ) ! C-grid ice dynamics : U & V-points (same as ocean)
507	#if defined key_vectopt_loop
508	!CDIR COLLAPSE
509	#endif
510	DO jj = 2, jpj
511	DO ji = fs_2, jpi ! vect. opt.
512	zwndi_t = ( sf(jp_wndi)%fnow(ji,jj,1) - 0.5 * ( pui(ji-1,jj ) + pui(ji,jj) ) )
513	zwndj_t = ( sf(jp_wndj)%fnow(ji,jj,1) - 0.5 * ( pvi(ji ,jj-1) + pvi(ji,jj) ) )
514	z_wnds_t(ji,jj) = SQRT( zwndi_t * zwndi_t + zwndj_t * zwndj_t ) * tmask(ji,jj,1)
515	END DO
516	END DO
517	#if defined key_vectopt_loop
518	!CDIR COLLAPSE
519	#endif
520	DO jj = 2, jpjm1
521	DO ji = fs_2, fs_jpim1 ! vect. opt.
522	p_taui(ji,jj) = zcoef_wnorm2 * ( z_wnds_t(ji+1,jj ) + z_wnds_t(ji,jj) ) &
523	& * ( 0.5 * (sf(jp_wndi)%fnow(ji+1,jj,1) + sf(jp_wndi)%fnow(ji,jj,1) ) - pui(ji,jj) )
524	p_tauj(ji,jj) = zcoef_wnorm2 * ( z_wnds_t(ji,jj+1 ) + z_wnds_t(ji,jj) ) &
525	& * ( 0.5 * (sf(jp_wndj)%fnow(ji,jj+1,1) + sf(jp_wndj)%fnow(ji,jj,1) ) - pvi(ji,jj) )
526	END DO
527	END DO
528	CALL lbc_lnk( p_taui , 'U', -1. )
529	CALL lbc_lnk( p_tauj , 'V', -1. )
530	CALL lbc_lnk( z_wnds_t, 'T', 1. )
531	!
532	END SELECT
533
534	zztmp = 1. / ( 1. - albo )
535	! ! ========================== !
536	DO jl = 1, ijpl ! Loop over ice categories !
537	! ! ========================== !
538	!CDIR NOVERRCHK
539	!CDIR COLLAPSE
540	DO jj = 1 , jpj
541	!CDIR NOVERRCHK
542	DO ji = 1, jpi
543	! ----------------------------!
544	! I Radiative FLUXES !
545	! ----------------------------!
546	zst2 = pst(ji,jj,jl) * pst(ji,jj,jl)
547	zst3 = pst(ji,jj,jl) * zst2
548	! Short Wave (sw)
549	p_qsr(ji,jj,jl) = zztmp * ( 1. - palb(ji,jj,jl) ) * qsr(ji,jj)
550	! Long Wave (lw)
551	z_qlw(ji,jj,jl) = 0.95 * ( sf(jp_qlw)%fnow(ji,jj,1) - Stef * pst(ji,jj,jl) * zst3 ) * tmask(ji,jj,1)
552	! lw sensitivity
553	z_dqlw(ji,jj,jl) = zcoef_dqlw * zst3
554
555	! ----------------------------!
556	! II Turbulent FLUXES !
557	! ----------------------------!
558
559	! ... turbulent heat fluxes
560	! Sensible Heat
561	z_qsb(ji,jj,jl) = rhoa * cpa * Cice * z_wnds_t(ji,jj) * ( pst(ji,jj,jl) - sf(jp_tair)%fnow(ji,jj,1) )
562	! Latent Heat
563	p_qla(ji,jj,jl) = MAX( 0.e0, rhoa * Ls * Cice * z_wnds_t(ji,jj) &
564	& * ( 11637800. * EXP( -5897.8 / pst(ji,jj,jl) ) / rhoa - sf(jp_humi)%fnow(ji,jj,1) ) )
565	! Latent heat sensitivity for ice (Dqla/Dt)
566	p_dqla(ji,jj,jl) = zcoef_dqla * z_wnds_t(ji,jj) / ( zst2 ) * EXP( -5897.8 / pst(ji,jj,jl) )
567	! Sensible heat sensitivity (Dqsb_ice/Dtn_ice)
568	z_dqsb(ji,jj,jl) = zcoef_dqsb * z_wnds_t(ji,jj)
569
570	! ----------------------------!
571	! III Total FLUXES !
572	! ----------------------------!
573	! Downward Non Solar flux
574	p_qns (ji,jj,jl) = z_qlw (ji,jj,jl) - z_qsb (ji,jj,jl) - p_qla (ji,jj,jl)
575	! Total non solar heat flux sensitivity for ice
576	p_dqns(ji,jj,jl) = - ( z_dqlw(ji,jj,jl) + z_dqsb(ji,jj,jl) + p_dqla(ji,jj,jl) )
577	END DO
578	!
579	END DO
580	!
581	END DO
582	!
583	!--------------------------------------------------------------------
584	! FRACTIONs of net shortwave radiation which is not absorbed in the
585	! thin surface layer and penetrates inside the ice cover
586	! ( Maykut and Untersteiner, 1971 ; Ebert and Curry, 1993 )
587
588	!CDIR COLLAPSE
589	p_fr1(:,:) = ( 0.18 * ( 1.0 - zcoef_frca ) + 0.35 * zcoef_frca )
590	!CDIR COLLAPSE
591	p_fr2(:,:) = ( 0.82 * ( 1.0 - zcoef_frca ) + 0.65 * zcoef_frca )
592
593	!CDIR COLLAPSE
594	p_tpr(:,:) = sf(jp_prec)%fnow(:,:,1) * rn_pfac ! total precipitation [kg/m2/s]
595	!CDIR COLLAPSE
596	p_spr(:,:) = sf(jp_snow)%fnow(:,:,1) * rn_pfac ! solid precipitation [kg/m2/s]
597	CALL iom_put( 'snowpre', p_spr ) ! Snow precipitation
598	!
599	IF(ln_ctl) THEN
600	CALL prt_ctl(tab3d_1=p_qla , clinfo1=' blk_ice_core: p_qla : ', tab3d_2=z_qsb , clinfo2=' z_qsb : ', kdim=ijpl)
601	CALL prt_ctl(tab3d_1=z_qlw , clinfo1=' blk_ice_core: z_qlw : ', tab3d_2=p_dqla , clinfo2=' p_dqla : ', kdim=ijpl)
602	CALL prt_ctl(tab3d_1=z_dqsb , clinfo1=' blk_ice_core: z_dqsb : ', tab3d_2=z_dqlw , clinfo2=' z_dqlw : ', kdim=ijpl)
603	CALL prt_ctl(tab3d_1=p_dqns , clinfo1=' blk_ice_core: p_dqns : ', tab3d_2=p_qsr , clinfo2=' p_qsr : ', kdim=ijpl)
604	CALL prt_ctl(tab3d_1=pst , clinfo1=' blk_ice_core: pst : ', tab3d_2=p_qns , clinfo2=' p_qns : ', kdim=ijpl)
605	CALL prt_ctl(tab2d_1=p_tpr , clinfo1=' blk_ice_core: p_tpr : ', tab2d_2=p_spr , clinfo2=' p_spr : ')
606	CALL prt_ctl(tab2d_1=p_taui , clinfo1=' blk_ice_core: p_taui : ', tab2d_2=p_tauj , clinfo2=' p_tauj : ')
607	CALL prt_ctl(tab2d_1=z_wnds_t, clinfo1=' blk_ice_core: z_wnds_t : ')
608	ENDIF
609
610	IF( wrk_not_released(2, 1) .OR. &
611	wrk_not_released(3, 4,5,6,7) ) CALL ctl_stop('blk_ice_core: failed to release workspace arrays')
612	!
613	END SUBROUTINE blk_ice_core
614
615
616	SUBROUTINE TURB_CORE_1Z(zu, sst, T_a, q_sat, q_a, &
617	& dU , Cd , Ch , Ce )
618	!!----------------------------------------------------------------------
619	!! * ROUTINE turb_core *
620	!!
621	!! ** Purpose : Computes turbulent transfert coefficients of surface
622	!! fluxes according to Large & Yeager (2004)
623	!!
624	!! ** 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
625	!! Momentum, Latent and sensible heat exchange coefficients
626	!! Caution: this procedure should only be used in cases when air
627	!! temperature (T_air), air specific humidity (q_air) and wind (dU)
628	!! are provided at the same height 'zzu'!
629	!!
630	!! References : Large & Yeager, 2004 : ???
631	!!----------------------------------------------------------------------
632	USE wrk_nemo, ONLY: wrk_in_use, wrk_not_released, iwrk_in_use, iwrk_not_released
633	USE wrk_nemo, ONLY: dU10 => wrk_2d_14 ! dU [m/s]
634	USE wrk_nemo, ONLY: dT => wrk_2d_15 ! air/sea temperature difference [K]
635	USE wrk_nemo, ONLY: dq => wrk_2d_16 ! air/sea humidity difference [K]
636	USE wrk_nemo, ONLY: Cd_n10 => wrk_2d_17 ! 10m neutral drag coefficient
637	USE wrk_nemo, ONLY: Ce_n10 => wrk_2d_18 ! 10m neutral latent coefficient
638	USE wrk_nemo, ONLY: Ch_n10 => wrk_2d_19 ! 10m neutral sensible coefficient
639	USE wrk_nemo, ONLY: sqrt_Cd_n10 => wrk_2d_20 ! root square of Cd_n10
640	USE wrk_nemo, ONLY: sqrt_Cd => wrk_2d_21 ! root square of Cd
641	USE wrk_nemo, ONLY: T_vpot => wrk_2d_22 ! virtual potential temperature [K]
642	USE wrk_nemo, ONLY: T_star => wrk_2d_23 ! turbulent scale of tem. fluct.
643	USE wrk_nemo, ONLY: q_star => wrk_2d_24 ! turbulent humidity of temp. fluct.
644	USE wrk_nemo, ONLY: U_star => wrk_2d_25 ! turb. scale of velocity fluct.
645	USE wrk_nemo, ONLY: L => wrk_2d_26 ! Monin-Obukov length [m]
646	USE wrk_nemo, ONLY: zeta => wrk_2d_27 ! stability parameter at height zu
647	USE wrk_nemo, ONLY: U_n10 => wrk_2d_28 ! neutral wind velocity at 10m [m]
648	USE wrk_nemo, ONLY: xlogt => wrk_2d_29, xct => wrk_2d_30, &
649	zpsi_h => wrk_2d_31, zpsi_m => wrk_2d_32
650	USE wrk_nemo, ONLY: stab => iwrk_2d_1 ! 1st guess stability test integer
651	!
652	REAL(wp) , INTENT(in ) :: zu ! altitude of wind measurement [m]
653	REAL(wp), DIMENSION(:,:), INTENT(in ) :: sst ! sea surface temperature [Kelvin]
654	REAL(wp), DIMENSION(:,:), INTENT(in ) :: T_a ! potential air temperature [Kelvin]
655	REAL(wp), DIMENSION(:,:), INTENT(in ) :: q_sat ! sea surface specific humidity [kg/kg]
656	REAL(wp), DIMENSION(:,:), INTENT(in ) :: q_a ! specific air humidity [kg/kg]
657	REAL(wp), DIMENSION(:,:), INTENT(in ) :: dU ! wind module \|U(zu)-U(0)\| [m/s]
658	REAL(wp), DIMENSION(:,:), INTENT( out) :: Cd ! transfert coefficient for momentum (tau)
659	REAL(wp), DIMENSION(:,:), INTENT( out) :: Ch ! transfert coefficient for temperature (Q_sens)
660	REAL(wp), DIMENSION(:,:), INTENT( out) :: Ce ! transfert coefficient for evaporation (Q_lat)
661	!!
662	INTEGER :: j_itt
663	INTEGER , PARAMETER :: nb_itt = 3
664	REAL(wp), PARAMETER :: grav = 9.8 ! gravity
665	REAL(wp), PARAMETER :: kappa = 0.4 ! von Karman s constant
666	!!----------------------------------------------------------------------
667
668	IF( wrk_in_use(2, 14,15,16,17,18,19, &
669	20,21,22,23,24,25,26,27,28,29, &
670	30,31,32) .OR. &
671	iwrk_in_use(2, 1) ) THEN
672	CALL ctl_stop('TURB_CORE_1Z: requested workspace arrays unavailable') ; RETURN
673	ENDIF
674
675	!! * Start
676	!! Air/sea differences
677	dU10 = max(0.5, dU) ! we don't want to fall under 0.5 m/s
678	dT = T_a - sst ! assuming that T_a is allready the potential temp. at zzu
679	dq = q_a - q_sat
680	!!
681	!! Virtual potential temperature
682	T_vpot = T_a(1. + 0.608q_a)
683	!!
684	!! Neutral Drag Coefficient
685	stab = 0.5 + sign(0.5,dT) ! stable : stab = 1 ; unstable : stab = 0
686	IF ( ln_cdgw ) THEN
687	cdn_wave = cdn_wave - rsmall*(tmask(:,:,1)-1)
688	Cd_n10(:,:) = cdn_wave
689	ELSE
690	Cd_n10 = 1E-3 * ( 2.7/dU10 + 0.142 + dU10/13.09 ) ! L & Y eq. (6a)
691	ENDIF
692	sqrt_Cd_n10 = sqrt(Cd_n10)
693	Ce_n10 = 1E-3 * ( 34.6 * sqrt_Cd_n10 ) ! L & Y eq. (6b)
694	Ch_n10 = 1E-3sqrt_Cd_n10(18stab + 32.7(1-stab)) ! L & Y eq. (6c), (6d)
695	!!
696	!! Initializing transfert coefficients with their first guess neutral equivalents :
697	Cd = Cd_n10 ; Ce = Ce_n10 ; Ch = Ch_n10 ; sqrt_Cd = sqrt(Cd)
698
699	!! * Now starting iteration loop
700	DO j_itt=1, nb_itt
701	!! Turbulent scales :
702	U_star = sqrt_Cd*dU10 ! L & Y eq. (7a)
703	T_star = Ch/sqrt_Cd*dT ! L & Y eq. (7b)
704	q_star = Ce/sqrt_Cd*dq ! L & Y eq. (7c)
705
706	!! Estimate the Monin-Obukov length :
707	L = (U_star*2)/( kappagrav*(T_star/T_vpot + q_star/(q_a + 1./0.608)) )
708
709	!! Stability parameters :
710	zeta = zu/L ; zeta = sign( min(abs(zeta),10.0), zeta )
711	zpsi_h = psi_h(zeta)
712	zpsi_m = psi_m(zeta)
713
714	IF ( ln_cdgw ) THEN
715	sqrt_Cd=kappa/((kappa/sqrt_Cd_n10) - zpsi_m) ; Cd=sqrt_Cd*sqrt_Cd;
716	ELSE
717	!! Shifting the wind speed to 10m and neutral stability :
718	U_n10 = dU101./(1. + sqrt_Cd_n10/kappa(log(zu/10.) - zpsi_m)) ! L & Y eq. (9a)
719
720	!! Updating the neutral 10m transfer coefficients :
721	Cd_n10 = 1E-3 * (2.7/U_n10 + 0.142 + U_n10/13.09) ! L & Y eq. (6a)
722	sqrt_Cd_n10 = sqrt(Cd_n10)
723	Ce_n10 = 1E-3 * (34.6 * sqrt_Cd_n10) ! L & Y eq. (6b)
724	stab = 0.5 + sign(0.5,zeta)
725	Ch_n10 = 1E-3sqrt_Cd_n10(18.stab + 32.7(1-stab)) ! L & Y eq. (6c), (6d)
726
727	!! Shifting the neutral 10m transfer coefficients to ( zu , zeta ) :
728	!!
729	xct = 1. + sqrt_Cd_n10/kappa*(log(zu/10) - zpsi_m)
730	Cd = Cd_n10/(xct*xct) ; sqrt_Cd = sqrt(Cd)
731	ENDIF
732	!!
733	xlogt = log(zu/10.) - zpsi_h
734	!!
735	xct = 1. + Ch_n10*xlogt/kappa/sqrt_Cd_n10
736	Ch = Ch_n10*sqrt_Cd/sqrt_Cd_n10/xct
737	!!
738	xct = 1. + Ce_n10*xlogt/kappa/sqrt_Cd_n10
739	Ce = Ce_n10*sqrt_Cd/sqrt_Cd_n10/xct
740	!!
741	END DO
742	!!
743	IF( wrk_not_released(2, 14,15,16,17,18,19, &
744	& 20,21,22,23,24,25,26,27,28,29, &
745	& 30,31,32 ) .OR. &
746	iwrk_not_released(2, 1) ) &
747	CALL ctl_stop('TURB_CORE_1Z: failed to release workspace arrays')
748	!
749	END SUBROUTINE TURB_CORE_1Z
750
751
752	SUBROUTINE TURB_CORE_2Z(zt, zu, sst, T_zt, q_sat, q_zt, dU, Cd, Ch, Ce, T_zu, q_zu)
753	!!----------------------------------------------------------------------
754	!! * ROUTINE turb_core *
755	!!
756	!! ** Purpose : Computes turbulent transfert coefficients of surface
757	!! fluxes according to Large & Yeager (2004).
758	!!
759	!! ** 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
760	!! Momentum, Latent and sensible heat exchange coefficients
761	!! Caution: this procedure should only be used in cases when air
762	!! temperature (T_air) and air specific humidity (q_air) are at 2m
763	!! whereas wind (dU) is at 10m.
764	!!
765	!! References : Large & Yeager, 2004 : ???
766	!!----------------------------------------------------------------------
767	USE wrk_nemo, ONLY: wrk_in_use, wrk_not_released, iwrk_in_use, iwrk_not_released
768	USE wrk_nemo, ONLY: dU10 => wrk_2d_14 ! dU [m/s]
769	USE wrk_nemo, ONLY: dT => wrk_2d_15 ! air/sea temperature difference [K]
770	USE wrk_nemo, ONLY: dq => wrk_2d_16 ! air/sea humidity difference [K]
771	USE wrk_nemo, ONLY: Cd_n10 => wrk_2d_17 ! 10m neutral drag coefficient
772	USE wrk_nemo, ONLY: Ce_n10 => wrk_2d_18 ! 10m neutral latent coefficient
773	USE wrk_nemo, ONLY: Ch_n10 => wrk_2d_19 ! 10m neutral sensible coefficient
774	USE wrk_nemo, ONLY: sqrt_Cd_n10 => wrk_2d_20 ! root square of Cd_n10
775	USE wrk_nemo, ONLY: sqrt_Cd => wrk_2d_21 ! root square of Cd
776	USE wrk_nemo, ONLY: T_vpot => wrk_2d_22 ! virtual potential temperature [K]
777	USE wrk_nemo, ONLY: T_star => wrk_2d_23 ! turbulent scale of tem. fluct.
778	USE wrk_nemo, ONLY: q_star => wrk_2d_24 ! turbulent humidity of temp. fluct.
779	USE wrk_nemo, ONLY: U_star => wrk_2d_25 ! turb. scale of velocity fluct.
780	USE wrk_nemo, ONLY: L => wrk_2d_26 ! Monin-Obukov length [m]
781	USE wrk_nemo, ONLY: zeta_u => wrk_2d_27 ! stability parameter at height zu
782	USE wrk_nemo, ONLY: zeta_t => wrk_2d_28 ! stability parameter at height zt
783	USE wrk_nemo, ONLY: U_n10 => wrk_2d_29 ! neutral wind velocity at 10m [m]
784	USE wrk_nemo, ONLY: xlogt => wrk_2d_30, xct => wrk_2d_31, zpsi_hu => wrk_2d_32, zpsi_ht => wrk_2d_33, zpsi_m => wrk_2d_34
785	USE wrk_nemo, ONLY: stab => iwrk_2d_1 ! 1st guess stability test integer
786	!!
787	REAL(wp), INTENT(in) :: &
788	zt, & ! height for T_zt and q_zt [m]
789	zu ! height for dU [m]
790	REAL(wp), INTENT(in), DIMENSION(jpi,jpj) :: &
791	sst, & ! sea surface temperature [Kelvin]
792	T_zt, & ! potential air temperature [Kelvin]
793	q_sat, & ! sea surface specific humidity [kg/kg]
794	q_zt, & ! specific air humidity [kg/kg]
795	dU ! relative wind module \|U(zu)-U(0)\| [m/s]
796	REAL(wp), INTENT(out), DIMENSION(jpi,jpj) :: &
797	Cd, & ! transfer coefficient for momentum (tau)
798	Ch, & ! transfer coefficient for sensible heat (Q_sens)
799	Ce, & ! transfert coefficient for evaporation (Q_lat)
800	T_zu, & ! air temp. shifted at zu [K]
801	q_zu ! spec. hum. shifted at zu [kg/kg]
802
803	INTEGER :: j_itt
804	INTEGER, PARAMETER :: nb_itt = 3 ! number of itterations
805	REAL(wp), PARAMETER :: &
806	grav = 9.8, & ! gravity
807	kappa = 0.4 ! von Karman's constant
808	!!----------------------------------------------------------------------
809	!! * Start
810
811	IF( wrk_in_use(2, 14,15,16,17,18,19, &
812	20,21,22,23,24,25,26,27,28,29, &
813	30,31,32,33,34) .OR. &
814	iwrk_in_use(2, 1) ) THEN
815	CALL ctl_stop('TURB_CORE_2Z: requested workspace arrays unavailable') ; RETURN
816	ENDIF
817
818	!! Initial air/sea differences
819	dU10 = max(0.5, dU) ! we don't want to fall under 0.5 m/s
820	dT = T_zt - sst
821	dq = q_zt - q_sat
822
823	!! Neutral Drag Coefficient :
824	stab = 0.5 + sign(0.5,dT) ! stab = 1 if dT > 0 -> STABLE
825	IF ( ln_cdgw ) THEN
826	cdn_wave = cdn_wave - rsmall*(tmask(:,:,1)-1)
827	Cd_n10(:,:) = cdn_wave
828	ELSE
829	Cd_n10 = 1E-3*( 2.7/dU10 + 0.142 + dU10/13.09 )
830	ENDIF
831	sqrt_Cd_n10 = sqrt(Cd_n10)
832	Ce_n10 = 1E-3( 34.6 sqrt_Cd_n10 )
833	Ch_n10 = 1E-3sqrt_Cd_n10(18stab + 32.7(1 - stab))
834
835	!! Initializing transf. coeff. with their first guess neutral equivalents :
836	Cd = Cd_n10 ; Ce = Ce_n10 ; Ch = Ch_n10 ; sqrt_Cd = sqrt(Cd)
837
838	!! Initializing z_u values with z_t values :
839	T_zu = T_zt ; q_zu = q_zt
840
841	!! * Now starting iteration loop
842	DO j_itt=1, nb_itt
843	dT = T_zu - sst ; dq = q_zu - q_sat ! Updating air/sea differences
844	T_vpot = T_zu(1. + 0.608q_zu) ! Updating virtual potential temperature at zu
845	U_star = sqrt_Cd*dU10 ! Updating turbulent scales : (L & Y eq. (7))
846	T_star = Ch/sqrt_Cd*dT !
847	q_star = Ce/sqrt_Cd*dq !
848	!!
849	L = (U_star*U_star) & ! Estimate the Monin-Obukov length at height zu
850	& / (kappagrav/T_vpot(T_star(1.+0.608q_zu) + 0.608T_zuq_star))
851	!! Stability parameters :
852	zeta_u = zu/L ; zeta_u = sign( min(abs(zeta_u),10.0), zeta_u )
853	zeta_t = zt/L ; zeta_t = sign( min(abs(zeta_t),10.0), zeta_t )
854	zpsi_hu = psi_h(zeta_u)
855	zpsi_ht = psi_h(zeta_t)
856	zpsi_m = psi_m(zeta_u)
857	!!
858	!! Shifting the wind speed to 10m and neutral stability : (L & Y eq.(9a))
859	! U_n10 = dU10/(1. + sqrt_Cd_n10/kappa*(log(zu/10.) - psi_m(zeta_u)))
860	U_n10 = dU10/(1. + sqrt_Cd_n10/kappa*(log(zu/10.) - zpsi_m))
861	!!
862	!! Shifting temperature and humidity at zu : (L & Y eq. (9b-9c))
863	! T_zu = T_zt - T_star/kappa*(log(zt/zu) + psi_h(zeta_u) - psi_h(zeta_t))
864	T_zu = T_zt - T_star/kappa*(log(zt/zu) + zpsi_hu - zpsi_ht)
865	! q_zu = q_zt - q_star/kappa*(log(zt/zu) + psi_h(zeta_u) - psi_h(zeta_t))
866	q_zu = q_zt - q_star/kappa*(log(zt/zu) + zpsi_hu - zpsi_ht)
867	!!
868	!! q_zu cannot have a negative value : forcing 0
869	stab = 0.5 + sign(0.5,q_zu) ; q_zu = stab*q_zu
870	!!
871	IF ( ln_cdgw ) THEN
872	sqrt_Cd=kappa/((kappa/sqrt_Cd_n10) - zpsi_m) ; Cd=sqrt_Cd*sqrt_Cd;
873	ELSE
874	!! Updating the neutral 10m transfer coefficients :
875	Cd_n10 = 1E-3 * (2.7/U_n10 + 0.142 + U_n10/13.09) ! L & Y eq. (6a)
876	sqrt_Cd_n10 = sqrt(Cd_n10)
877	Ce_n10 = 1E-3 * (34.6 * sqrt_Cd_n10) ! L & Y eq. (6b)
878	stab = 0.5 + sign(0.5,zeta_u)
879	Ch_n10 = 1E-3sqrt_Cd_n10(18.stab + 32.7(1-stab)) ! L & Y eq. (6c-6d)
880	!!
881	!!
882	!! Shifting the neutral 10m transfer coefficients to (zu,zeta_u) :
883	xct = 1. + sqrt_Cd_n10/kappa*(log(zu/10.) - zpsi_m)
884	Cd = Cd_n10/(xct*xct) ; sqrt_Cd = sqrt(Cd)
885	ENDIF
886	!!
887	xlogt = log(zu/10.) - zpsi_hu
888	!!
889	xct = 1. + Ch_n10*xlogt/kappa/sqrt_Cd_n10
890	Ch = Ch_n10*sqrt_Cd/sqrt_Cd_n10/xct
891	!!
892	xct = 1. + Ce_n10*xlogt/kappa/sqrt_Cd_n10
893	Ce = Ce_n10*sqrt_Cd/sqrt_Cd_n10/xct
894	!!
895	!!
896	END DO
897	!!
898	IF( wrk_not_released(2, 14,15,16,17,18,19, &
899	& 20,21,22,23,24,25,26,27,28,29, &
900	& 30,31,32,33,34 ) .OR. &
901	iwrk_not_released(2, 1) ) &
902	CALL ctl_stop('TURB_CORE_2Z: failed to release workspace arrays')
903	!
904	END SUBROUTINE TURB_CORE_2Z
905
906
907	FUNCTION psi_m(zta) !! Psis, L & Y eq. (8c), (8d), (8e)
908	!-------------------------------------------------------------------------------
909	USE wrk_nemo, ONLY: wrk_in_use, wrk_not_released
910	USE wrk_nemo, ONLY: X2 => wrk_2d_35
911	USE wrk_nemo, ONLY: X => wrk_2d_36
912	USE wrk_nemo, ONLY: stabit => wrk_2d_37
913	!!
914	REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: zta
915
916	REAL(wp), PARAMETER :: pi = 3.141592653589793_wp
917	REAL(wp), DIMENSION(jpi,jpj) :: psi_m
918	!-------------------------------------------------------------------------------
919
920	IF( wrk_in_use(2, 35,36,37) ) THEN
921	CALL ctl_stop('psi_m: requested workspace arrays unavailable') ; RETURN
922	ENDIF
923
924	X2 = sqrt(abs(1. - 16.*zta)) ; X2 = max(X2 , 1.0) ; X = sqrt(X2)
925	stabit = 0.5 + sign(0.5,zta)
926	psi_m = -5.ztastabit & ! Stable
927	& + (1. - stabit)(2log((1. + X)/2) + log((1. + X2)/2) - 2*atan(X) + pi/2) ! Unstable
928
929	IF( wrk_not_released(2, 35,36,37) ) CALL ctl_stop('psi_m: failed to release workspace arrays')
930	!
931	END FUNCTION psi_m
932
933
934	FUNCTION psi_h( zta ) !! Psis, L & Y eq. (8c), (8d), (8e)
935	!-------------------------------------------------------------------------------
936	USE wrk_nemo, ONLY: wrk_in_use, wrk_not_released
937	USE wrk_nemo, ONLY: X2 => wrk_2d_35
938	USE wrk_nemo, ONLY: X => wrk_2d_36
939	USE wrk_nemo, ONLY: stabit => wrk_2d_37
940	!
941	REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: zta
942	!
943	REAL(wp), DIMENSION(jpi,jpj) :: psi_h
944	!-------------------------------------------------------------------------------
945
946	IF( wrk_in_use(2, 35,36,37) ) THEN
947	CALL ctl_stop('psi_h: requested workspace arrays unavailable') ; RETURN
948	ENDIF
949
950	X2 = sqrt(abs(1. - 16.*zta)) ; X2 = max(X2 , 1.) ; X = sqrt(X2)
951	stabit = 0.5 + sign(0.5,zta)
952	psi_h = -5.ztastabit & ! Stable
953	& + (1. - stabit)(2.log( (1. + X2)/2. )) ! Unstable
954
955	IF( wrk_not_released(2, 35,36,37) ) CALL ctl_stop('psi_h: failed to release workspace arrays')
956	!
957	END FUNCTION psi_h
958
959	!!======================================================================
960	END MODULE sbcblk_core

Note: See TracBrowser for help on using the repository browser.

Download in other formats: