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/2015/dev_r5218_CNRS17_coupling/NEMOGCM/NEMO/OPA_SRC/SBC – NEMO

Context Navigation

source: branches/2015/dev_r5218_CNRS17_coupling/NEMOGCM/NEMO/OPA_SRC/SBC/sbcblk_core.F90 @ 5376

Last change on this file since 5376 was 5376, checked in by smasson, 9 years ago
dev_r5218_CNRS17_coupling: bugfix for SAS-OPA coupling
Property svn:keywords set to `Id`
File size: 52.5 KB

Line
1	MODULE sbcblk_core
2	!!======================================================================
3	!! * MODULE sbcblk_core *
4	!! Ocean forcing: momentum, heat and freshwater flux formulation
5	!!=====================================================================
6	!! History : 1.0 ! 2004-08 (U. Schweckendiek) Original code
7	!! 2.0 ! 2005-04 (L. Brodeau, A.M. Treguier) additions:
8	!! - new bulk routine for efficiency
9	!! - WINDS ARE NOW ASSUMED TO BE AT T POINTS in input files !!!!
10	!! - file names and file characteristics in namelist
11	!! - Implement reading of 6-hourly fields
12	!! 3.0 ! 2006-06 (G. Madec) sbc rewritting
13	!! - ! 2006-12 (L. Brodeau) Original code for turb_core_2z
14	!! 3.2 ! 2009-04 (B. Lemaire) Introduce iom_put
15	!! 3.3 ! 2010-10 (S. Masson) add diurnal cycle
16	!! 3.4 ! 2011-11 (C. Harris) Fill arrays required by CICE
17	!! 3.7 ! 2014-06 (L. Brodeau) simplification and optimization of CORE bulk
18	!!----------------------------------------------------------------------
19
20	!!----------------------------------------------------------------------
21	!! sbc_blk_core : bulk formulation as ocean surface boundary condition (forced mode, CORE bulk formulea)
22	!! blk_oce_core : computes momentum, heat and freshwater fluxes over ocean
23	!! blk_ice_core : computes momentum, heat and freshwater fluxes over ice
24	!! blk_bio_meanqsr : compute daily mean short wave radiation over the ocean
25	!! blk_ice_meanqsr : compute daily mean short wave radiation over the ice
26	!! turb_core_2z : Computes turbulent transfert coefficients
27	!! cd_neutral_10m : Estimate of the neutral drag coefficient at 10m
28	!! psi_m : universal profile stability function for momentum
29	!! psi_h : universal profile stability function for temperature and humidity
30	!!----------------------------------------------------------------------
31	USE oce ! ocean dynamics and tracers
32	USE dom_oce ! ocean space and time domain
33	USE phycst ! physical constants
34	USE fldread ! read input fields
35	USE sbc_oce ! Surface boundary condition: ocean fields
36	USE cyclone ! Cyclone 10m wind form trac of cyclone centres
37	USE sbcdcy ! surface boundary condition: diurnal cycle
38	USE iom ! I/O manager library
39	USE in_out_manager ! I/O manager
40	USE lib_mpp ! distribued memory computing library
41	USE wrk_nemo ! work arrays
42	USE timing ! Timing
43	USE lbclnk ! ocean lateral boundary conditions (or mpp link)
44	USE prtctl ! Print control
45	USE sbcwave, ONLY : cdn_wave ! wave module
46	USE sbc_ice ! Surface boundary condition: ice fields
47	USE lib_fortran ! to use key_nosignedzero
48	#if defined key_lim3
49	USE ice, ONLY : u_ice, v_ice, jpl, pfrld, a_i_b
50	USE limthd_dh ! for CALL lim_thd_snwblow
51	#elif defined key_lim2
52	USE ice_2, ONLY : u_ice, v_ice
53	USE par_ice_2
54	#endif
55
56	IMPLICIT NONE
57	PRIVATE
58
59	PUBLIC sbc_blk_core ! routine called in sbcmod module
60	#if defined key_lim2 \|\| defined key_lim3
61	PUBLIC blk_ice_core_tau ! routine called in sbc_ice_lim module
62	PUBLIC blk_ice_core_flx ! routine called in sbc_ice_lim module
63	#endif
64	PUBLIC blk_ice_meanqsr ! routine called in sbc_ice_lim module
65	PUBLIC turb_core_2z ! routine calles in sbcblk_mfs module
66
67	INTEGER , PARAMETER :: jpfld = 9 ! maximum number of files to read
68	INTEGER , PARAMETER :: jp_wndi = 1 ! index of 10m wind velocity (i-component) (m/s) at T-point
69	INTEGER , PARAMETER :: jp_wndj = 2 ! index of 10m wind velocity (j-component) (m/s) at T-point
70	INTEGER , PARAMETER :: jp_humi = 3 ! index of specific humidity ( % )
71	INTEGER , PARAMETER :: jp_qsr = 4 ! index of solar heat (W/m2)
72	INTEGER , PARAMETER :: jp_qlw = 5 ! index of Long wave (W/m2)
73	INTEGER , PARAMETER :: jp_tair = 6 ! index of 10m air temperature (Kelvin)
74	INTEGER , PARAMETER :: jp_prec = 7 ! index of total precipitation (rain+snow) (Kg/m2/s)
75	INTEGER , PARAMETER :: jp_snow = 8 ! index of snow (solid prcipitation) (kg/m2/s)
76	INTEGER , PARAMETER :: jp_tdif = 9 ! index of tau diff associated to HF tau (N/m2) at T-point
77
78	TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf ! structure of input fields (file informations, fields read)
79
80	! !!! CORE bulk parameters
81	REAL(wp), PARAMETER :: rhoa = 1.22 ! air density
82	REAL(wp), PARAMETER :: cpa = 1000.5 ! specific heat of air
83	REAL(wp), PARAMETER :: Lv = 2.5e6 ! latent heat of vaporization
84	REAL(wp), PARAMETER :: Ls = 2.839e6 ! latent heat of sublimation
85	REAL(wp), PARAMETER :: Stef = 5.67e-8 ! Stefan Boltzmann constant
86	REAL(wp), PARAMETER :: Cice = 1.4e-3 ! iovi 1.63e-3 ! transfer coefficient over ice
87	REAL(wp), PARAMETER :: albo = 0.066 ! ocean albedo assumed to be constant
88
89	! !!* Namelist namsbc_core : CORE bulk parameters
90	LOGICAL :: ln_taudif ! logical flag to use the "mean of stress module - module of mean stress" data
91	REAL(wp) :: rn_pfac ! multiplication factor for precipitation
92	REAL(wp) :: rn_efac ! multiplication factor for evaporation (clem)
93	REAL(wp) :: rn_vfac ! multiplication factor for ice/ocean velocity in the calculation of wind stress (clem)
94	REAL(wp) :: rn_zqt ! z(q,t) : height of humidity and temperature measurements
95	REAL(wp) :: rn_zu ! z(u) : height of wind measurements
96
97	!! * Substitutions
98	# include "domzgr_substitute.h90"
99	# include "vectopt_loop_substitute.h90"
100	!!----------------------------------------------------------------------
101	!! NEMO/OPA 3.7 , NEMO-consortium (2014)
102	!! $Id$
103	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
104	!!----------------------------------------------------------------------
105	CONTAINS
106
107	SUBROUTINE sbc_blk_core( kt )
108	!!---------------------------------------------------------------------
109	!! * ROUTINE sbc_blk_core *
110	!!
111	!! ** Purpose : provide at each time step the surface ocean fluxes
112	!! (momentum, heat, freshwater and runoff)
113	!!
114	!! ** Method : (1) READ each fluxes in NetCDF files:
115	!! the 10m wind velocity (i-component) (m/s) at T-point
116	!! the 10m wind velocity (j-component) (m/s) at T-point
117	!! the 10m or 2m specific humidity ( % )
118	!! the solar heat (W/m2)
119	!! the Long wave (W/m2)
120	!! the 10m or 2m air temperature (Kelvin)
121	!! the total precipitation (rain+snow) (Kg/m2/s)
122	!! the snow (solid prcipitation) (kg/m2/s)
123	!! the tau diff associated to HF tau (N/m2) at T-point (ln_taudif=T)
124	!! (2) CALL blk_oce_core
125	!!
126	!! C A U T I O N : never mask the surface stress fields
127	!! the stress is assumed to be in the (i,j) mesh referential
128	!!
129	!! ** Action : defined at each time-step at the air-sea interface
130	!! - utau, vtau i- and j-component of the wind stress
131	!! - taum wind stress module at T-point
132	!! - wndm wind speed module at T-point over free ocean or leads in presence of sea-ice
133	!! - qns, qsr non-solar and solar heat fluxes
134	!! - emp upward mass flux (evapo. - precip.)
135	!! - sfx salt flux due to freezing/melting (non-zero only if ice is present)
136	!! (set in limsbc(_2).F90)
137	!!
138	!! ** References : Large & Yeager, 2004 / Large & Yeager, 2008
139	!! Brodeau et al. Ocean Modelling 2010
140	!!----------------------------------------------------------------------
141	INTEGER, INTENT(in) :: kt ! ocean time step
142	!
143	INTEGER :: ierror ! return error code
144	INTEGER :: ifpr ! dummy loop indice
145	INTEGER :: jfld ! dummy loop arguments
146	INTEGER :: ios ! Local integer output status for namelist read
147	!
148	CHARACTER(len=100) :: cn_dir ! Root directory for location of core files
149	TYPE(FLD_N), DIMENSION(jpfld) :: slf_i ! array of namelist informations on the fields to read
150	TYPE(FLD_N) :: sn_wndi, sn_wndj, sn_humi, sn_qsr ! informations about the fields to be read
151	TYPE(FLD_N) :: sn_qlw , sn_tair, sn_prec, sn_snow ! " "
152	TYPE(FLD_N) :: sn_tdif ! " "
153	NAMELIST/namsbc_core/ cn_dir , ln_taudif, rn_pfac, rn_efac, rn_vfac, &
154	& sn_wndi, sn_wndj, sn_humi , sn_qsr , &
155	& sn_qlw , sn_tair, sn_prec , sn_snow, &
156	& sn_tdif, rn_zqt, rn_zu
157	!!---------------------------------------------------------------------
158	!
159	! ! ====================== !
160	IF( kt == nit000 ) THEN ! First call kt=nit000 !
161	! ! ====================== !
162	!
163	REWIND( numnam_ref ) ! Namelist namsbc_core in reference namelist : CORE bulk parameters
164	READ ( numnam_ref, namsbc_core, IOSTAT = ios, ERR = 901)
165	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_core in reference namelist', lwp )
166	!
167	REWIND( numnam_cfg ) ! Namelist namsbc_core in configuration namelist : CORE bulk parameters
168	READ ( numnam_cfg, namsbc_core, IOSTAT = ios, ERR = 902 )
169	902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_core in configuration namelist', lwp )
170
171	IF(lwm) WRITE( numond, namsbc_core )
172	! ! check: do we plan to use ln_dm2dc with non-daily forcing?
173	IF( ln_dm2dc .AND. sn_qsr%nfreqh /= 24 ) &
174	& CALL ctl_stop( 'sbc_blk_core: ln_dm2dc can be activated only with daily short-wave forcing' )
175	IF( ln_dm2dc .AND. sn_qsr%ln_tint ) THEN
176	CALL ctl_warn( 'sbc_blk_core: ln_dm2dc is taking care of the temporal interpolation of daily qsr', &
177	& ' ==> We force time interpolation = .false. for qsr' )
178	sn_qsr%ln_tint = .false.
179	ENDIF
180	! ! store namelist information in an array
181	slf_i(jp_wndi) = sn_wndi ; slf_i(jp_wndj) = sn_wndj
182	slf_i(jp_qsr ) = sn_qsr ; slf_i(jp_qlw ) = sn_qlw
183	slf_i(jp_tair) = sn_tair ; slf_i(jp_humi) = sn_humi
184	slf_i(jp_prec) = sn_prec ; slf_i(jp_snow) = sn_snow
185	slf_i(jp_tdif) = sn_tdif
186	!
187	lhftau = ln_taudif ! do we use HF tau information?
188	jfld = jpfld - COUNT( (/.NOT. lhftau/) )
189	!
190	ALLOCATE( sf(jfld), STAT=ierror ) ! set sf structure
191	IF( ierror > 0 ) CALL ctl_stop( 'STOP', 'sbc_blk_core: unable to allocate sf structure' )
192	DO ifpr= 1, jfld
193	ALLOCATE( sf(ifpr)%fnow(jpi,jpj,1) )
194	IF( slf_i(ifpr)%ln_tint ) ALLOCATE( sf(ifpr)%fdta(jpi,jpj,1,2) )
195	END DO
196	! ! fill sf with slf_i and control print
197	CALL fld_fill( sf, slf_i, cn_dir, 'sbc_blk_core', 'flux formulation for ocean surface boundary condition', 'namsbc_core' )
198	!
199	sfx(:,:) = 0._wp ! salt flux; zero unless ice is present (computed in limsbc(_2).F90)
200	!
201	ENDIF
202
203	CALL fld_read( kt, nn_fsbc, sf ) ! input fields provided at the current time-step
204
205	! ! compute the surface ocean fluxes using CORE bulk formulea
206	IF( MOD( kt - 1, nn_fsbc ) == 0 ) CALL blk_oce_core( kt, sf, sst_m, ssu_m, ssv_m )
207
208	! If diurnal cycle is activated, compute a daily mean short waves flux for biogeochemistery
209	IF( ltrcdm2dc ) CALL blk_bio_meanqsr
210
211	#if defined key_cice
212	IF( MOD( kt - 1, nn_fsbc ) == 0 ) THEN
213	qlw_ice(:,:,1) = sf(jp_qlw)%fnow(:,:,1)
214	qsr_ice(:,:,1) = sf(jp_qsr)%fnow(:,:,1)
215	tatm_ice(:,:) = sf(jp_tair)%fnow(:,:,1)
216	qatm_ice(:,:) = sf(jp_humi)%fnow(:,:,1)
217	tprecip(:,:) = sf(jp_prec)%fnow(:,:,1) * rn_pfac
218	sprecip(:,:) = sf(jp_snow)%fnow(:,:,1) * rn_pfac
219	wndi_ice(:,:) = sf(jp_wndi)%fnow(:,:,1)
220	wndj_ice(:,:) = sf(jp_wndj)%fnow(:,:,1)
221	ENDIF
222	#endif
223	!
224	END SUBROUTINE sbc_blk_core
225
226
227	SUBROUTINE blk_oce_core( kt, sf, pst, pu, pv )
228	!!---------------------------------------------------------------------
229	!! * ROUTINE blk_core *
230	!!
231	!! ** Purpose : provide the momentum, heat and freshwater fluxes at
232	!! the ocean surface at each time step
233	!!
234	!! ** Method : CORE bulk formulea for the ocean using atmospheric
235	!! fields read in sbc_read
236	!!
237	!! ** Outputs : - utau : i-component of the stress at U-point (N/m2)
238	!! - vtau : j-component of the stress at V-point (N/m2)
239	!! - taum : Wind stress module at T-point (N/m2)
240	!! - wndm : Wind speed module at T-point (m/s)
241	!! - qsr : Solar heat flux over the ocean (W/m2)
242	!! - qns : Non Solar heat flux over the ocean (W/m2)
243	!! - emp : evaporation minus precipitation (kg/m2/s)
244	!!
245	!! ** Nota : sf has to be a dummy argument for AGRIF on NEC
246	!!---------------------------------------------------------------------
247	INTEGER , INTENT(in ) :: kt ! time step index
248	TYPE(fld), INTENT(inout), DIMENSION(:) :: sf ! input data
249	REAL(wp) , INTENT(in) , DIMENSION(:,:) :: pst ! surface temperature [Celcius]
250	REAL(wp) , INTENT(in) , DIMENSION(:,:) :: pu ! surface current at U-point (i-component) [m/s]
251	REAL(wp) , INTENT(in) , DIMENSION(:,:) :: pv ! surface current at V-point (j-component) [m/s]
252	!
253	INTEGER :: ji, jj ! dummy loop indices
254	REAL(wp) :: zcoef_qsatw, zztmp ! local variable
255	REAL(wp), DIMENSION(:,:), POINTER :: zwnd_i, zwnd_j ! wind speed components at T-point
256	REAL(wp), DIMENSION(:,:), POINTER :: zqsatw ! specific humidity at pst
257	REAL(wp), DIMENSION(:,:), POINTER :: zqlw, zqsb ! long wave and sensible heat fluxes
258	REAL(wp), DIMENSION(:,:), POINTER :: zqla, zevap ! latent heat fluxes and evaporation
259	REAL(wp), DIMENSION(:,:), POINTER :: Cd ! transfer coefficient for momentum (tau)
260	REAL(wp), DIMENSION(:,:), POINTER :: Ch ! transfer coefficient for sensible heat (Q_sens)
261	REAL(wp), DIMENSION(:,:), POINTER :: Ce ! tansfert coefficient for evaporation (Q_lat)
262	REAL(wp), DIMENSION(:,:), POINTER :: zst ! surface temperature in Kelvin
263	REAL(wp), DIMENSION(:,:), POINTER :: zt_zu ! air temperature at wind speed height
264	REAL(wp), DIMENSION(:,:), POINTER :: zq_zu ! air spec. hum. at wind speed height
265	!!---------------------------------------------------------------------
266	!
267	IF( nn_timing == 1 ) CALL timing_start('blk_oce_core')
268	!
269	CALL wrk_alloc( jpi,jpj, zwnd_i, zwnd_j, zqsatw, zqlw, zqsb, zqla, zevap )
270	CALL wrk_alloc( jpi,jpj, Cd, Ch, Ce, zst, zt_zu, zq_zu )
271	!
272	! local scalars ( place there for vector optimisation purposes)
273	zcoef_qsatw = 0.98 * 640380. / rhoa
274
275	zst(:,:) = pst(:,:) + rt0 ! convert SST from Celcius to Kelvin (and set minimum value far above 0 K)
276
277	! ----------------------------------------------------------------------------- !
278	! 0 Wind components and module at T-point relative to the moving ocean !
279	! ----------------------------------------------------------------------------- !
280
281	! ... components ( U10m - U_oce ) at T-point (unmasked)
282	zwnd_i(:,:) = 0.e0
283	zwnd_j(:,:) = 0.e0
284	#if defined key_cyclone
285	CALL wnd_cyc( kt, zwnd_i, zwnd_j ) ! add analytical tropical cyclone (Vincent et al. JGR 2012)
286	DO jj = 2, jpjm1
287	DO ji = fs_2, fs_jpim1 ! vect. opt.
288	sf(jp_wndi)%fnow(ji,jj,1) = sf(jp_wndi)%fnow(ji,jj,1) + zwnd_i(ji,jj)
289	sf(jp_wndj)%fnow(ji,jj,1) = sf(jp_wndj)%fnow(ji,jj,1) + zwnd_j(ji,jj)
290	END DO
291	END DO
292	#endif
293	DO jj = 2, jpjm1
294	DO ji = fs_2, fs_jpim1 ! vect. opt.
295	zwnd_i(ji,jj) = ( sf(jp_wndi)%fnow(ji,jj,1) - rn_vfac * 0.5 * ( pu(ji-1,jj ) + pu(ji,jj) ) )
296	zwnd_j(ji,jj) = ( sf(jp_wndj)%fnow(ji,jj,1) - rn_vfac * 0.5 * ( pv(ji ,jj-1) + pv(ji,jj) ) )
297	END DO
298	END DO
299	CALL lbc_lnk( zwnd_i(:,:) , 'T', -1. )
300	CALL lbc_lnk( zwnd_j(:,:) , 'T', -1. )
301	! ... scalar wind ( = \| U10m - U_oce \| ) at T-point (masked)
302	wndm(:,:) = SQRT( zwnd_i(:,:) * zwnd_i(:,:) &
303	& + zwnd_j(:,:) * zwnd_j(:,:) ) * tmask(:,:,1)
304
305	! ----------------------------------------------------------------------------- !
306	! I Radiative FLUXES !
307	! ----------------------------------------------------------------------------- !
308
309	! ocean albedo assumed to be constant + modify now Qsr to include the diurnal cycle ! Short Wave
310	zztmp = 1. - albo
311	IF( ln_dm2dc ) THEN ; qsr(:,:) = zztmp * sbc_dcy( sf(jp_qsr)%fnow(:,:,1) ) * tmask(:,:,1)
312	ELSE ; qsr(:,:) = zztmp * sf(jp_qsr)%fnow(:,:,1) * tmask(:,:,1)
313	ENDIF
314	zqlw(:,:) = ( sf(jp_qlw)%fnow(:,:,1) - Stef * zst(:,:)zst(:,:)zst(:,:)zst(:,:) ) tmask(:,:,1) ! Long Wave
315	! ----------------------------------------------------------------------------- !
316	! II Turbulent FLUXES !
317	! ----------------------------------------------------------------------------- !
318
319	! ... specific humidity at SST and IST
320	zqsatw(:,:) = zcoef_qsatw * EXP( -5107.4 / zst(:,:) )
321
322	! ... NCAR Bulk formulae, computation of Cd, Ch, Ce at T-point :
323	CALL turb_core_2z( rn_zqt, rn_zu, zst, sf(jp_tair)%fnow, zqsatw, sf(jp_humi)%fnow, wndm, &
324	& Cd, Ch, Ce, zt_zu, zq_zu )
325
326	! ... tau module, i and j component
327	DO jj = 1, jpj
328	DO ji = 1, jpi
329	zztmp = rhoa * wndm(ji,jj) * Cd(ji,jj)
330	taum (ji,jj) = zztmp * wndm (ji,jj)
331	zwnd_i(ji,jj) = zztmp * zwnd_i(ji,jj)
332	zwnd_j(ji,jj) = zztmp * zwnd_j(ji,jj)
333	END DO
334	END DO
335
336	! ... add the HF tau contribution to the wind stress module?
337	IF( lhftau ) THEN
338	taum(:,:) = taum(:,:) + sf(jp_tdif)%fnow(:,:,1)
339	ENDIF
340	CALL iom_put( "taum_oce", taum ) ! output wind stress module
341
342	! ... utau, vtau at U- and V_points, resp.
343	! Note the use of 0.5*(2-umask) in order to unmask the stress along coastlines
344	! Note the use of MAX(tmask(i,j),tmask(i+1,j) is to mask tau over ice shelves
345	DO jj = 1, jpjm1
346	DO ji = 1, fs_jpim1
347	utau(ji,jj) = 0.5 * ( 2. - umask(ji,jj,1) ) * ( zwnd_i(ji,jj) + zwnd_i(ji+1,jj ) ) &
348	& * MAX(tmask(ji,jj,1),tmask(ji+1,jj,1))
349	vtau(ji,jj) = 0.5 * ( 2. - vmask(ji,jj,1) ) * ( zwnd_j(ji,jj) + zwnd_j(ji ,jj+1) ) &
350	& * MAX(tmask(ji,jj,1),tmask(ji,jj+1,1))
351	END DO
352	END DO
353	CALL lbc_lnk( utau(:,:), 'U', -1. )
354	CALL lbc_lnk( vtau(:,:), 'V', -1. )
355
356
357	! Turbulent fluxes over ocean
358	! -----------------------------
359	IF( ABS( rn_zu - rn_zqt) < 0.01_wp ) THEN
360	!! q_air and t_air are (or "are almost") given at 10m (wind reference height)
361	zevap(:,:) = rn_efacMAX( 0._wp, rhoaCe(:,:)( zqsatw(:,:) - sf(jp_humi)%fnow(:,:,1) )wndm(:,:) ) ! Evaporation
362	zqsb (:,:) = cparhoaCh(:,:)( zst (:,:) - sf(jp_tair)%fnow(:,:,1) )wndm(:,:) ! Sensible Heat
363	ELSE
364	!! q_air and t_air are not given at 10m (wind reference height)
365	! Values of temp. and hum. adjusted to height of wind during bulk algorithm iteration must be used!!!
366	zevap(:,:) = rn_efacMAX( 0._wp, rhoaCe(:,:)( zqsatw(:,:) - zq_zu(:,:) )wndm(:,:) ) ! Evaporation
367	zqsb (:,:) = cparhoaCh(:,:)( zst (:,:) - zt_zu(:,:) )wndm(:,:) ! Sensible Heat
368	ENDIF
369	zqla (:,:) = Lv * zevap(:,:) ! Latent Heat
370
371	IF(ln_ctl) THEN
372	CALL prt_ctl( tab2d_1=zqla , clinfo1=' blk_oce_core: zqla : ', tab2d_2=Ce , clinfo2=' Ce : ' )
373	CALL prt_ctl( tab2d_1=zqsb , clinfo1=' blk_oce_core: zqsb : ', tab2d_2=Ch , clinfo2=' Ch : ' )
374	CALL prt_ctl( tab2d_1=zqlw , clinfo1=' blk_oce_core: zqlw : ', tab2d_2=qsr, clinfo2=' qsr : ' )
375	CALL prt_ctl( tab2d_1=zqsatw, clinfo1=' blk_oce_core: zqsatw : ', tab2d_2=zst, clinfo2=' zst : ' )
376	CALL prt_ctl( tab2d_1=utau , clinfo1=' blk_oce_core: utau : ', mask1=umask, &
377	& tab2d_2=vtau , clinfo2= ' vtau : ' , mask2=vmask )
378	CALL prt_ctl( tab2d_1=wndm , clinfo1=' blk_oce_core: wndm : ')
379	CALL prt_ctl( tab2d_1=zst , clinfo1=' blk_oce_core: zst : ')
380	ENDIF
381
382	! ----------------------------------------------------------------------------- !
383	! III Total FLUXES !
384	! ----------------------------------------------------------------------------- !
385	!
386	emp (:,:) = ( zevap(:,:) & ! mass flux (evap. - precip.)
387	& - sf(jp_prec)%fnow(:,:,1) * rn_pfac ) * tmask(:,:,1)
388	!
389	qns(:,:) = zqlw(:,:) - zqsb(:,:) - zqla(:,:) & ! Downward Non Solar
390	& - sf(jp_snow)%fnow(:,:,1) * rn_pfac * lfus & ! remove latent melting heat for solid precip
391	& - zevap(:,:) * pst(:,:) * rcp & ! remove evap heat content at SST
392	& + ( sf(jp_prec)%fnow(:,:,1) - sf(jp_snow)%fnow(:,:,1) ) * rn_pfac & ! add liquid precip heat content at Tair
393	& * ( sf(jp_tair)%fnow(:,:,1) - rt0 ) * rcp &
394	& + sf(jp_snow)%fnow(:,:,1) * rn_pfac & ! add solid precip heat content at min(Tair,Tsnow)
395	& * ( MIN( sf(jp_tair)%fnow(:,:,1), rt0_snow ) - rt0 ) * cpic * tmask(:,:,1)
396	!
397	#if defined key_lim3
398	qns_oce(:,:) = zqlw(:,:) - zqsb(:,:) - zqla(:,:) ! non solar without emp (only needed by LIM3)
399	qsr_oce(:,:) = qsr(:,:)
400	#endif
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	CALL iom_put( "qsr_oce", qsr ) ! output downward solar heat over the ocean
408	CALL iom_put( "qt_oce" , qns+qsr ) ! output total downward heat over the ocean
409	!
410	IF(ln_ctl) THEN
411	CALL prt_ctl(tab2d_1=zqsb , clinfo1=' blk_oce_core: zqsb : ', tab2d_2=zqlw , clinfo2=' zqlw : ')
412	CALL prt_ctl(tab2d_1=zqla , clinfo1=' blk_oce_core: zqla : ', tab2d_2=qsr , clinfo2=' qsr : ')
413	CALL prt_ctl(tab2d_1=pst , clinfo1=' blk_oce_core: pst : ', tab2d_2=emp , clinfo2=' emp : ')
414	CALL prt_ctl(tab2d_1=utau , clinfo1=' blk_oce_core: utau : ', mask1=umask, &
415	& tab2d_2=vtau , clinfo2= ' vtau : ' , mask2=vmask )
416	ENDIF
417	!
418	CALL wrk_dealloc( jpi,jpj, zwnd_i, zwnd_j, zqsatw, zqlw, zqsb, zqla, zevap )
419	CALL wrk_dealloc( jpi,jpj, Cd, Ch, Ce, zst, zt_zu, zq_zu )
420	!
421	IF( nn_timing == 1 ) CALL timing_stop('blk_oce_core')
422	!
423	END SUBROUTINE blk_oce_core
424
425
426	#if defined key_lim2 \|\| defined key_lim3
427	SUBROUTINE blk_ice_core_tau
428	!!---------------------------------------------------------------------
429	!! * ROUTINE blk_ice_core_tau *
430	!!
431	!! ** Purpose : provide the surface boundary condition over sea-ice
432	!!
433	!! ** Method : compute momentum using CORE bulk
434	!! formulea, ice variables and read atmospheric fields.
435	!! NB: ice drag coefficient is assumed to be a constant
436	!!---------------------------------------------------------------------
437	INTEGER :: ji, jj ! dummy loop indices
438	REAL(wp) :: zcoef_wnorm, zcoef_wnorm2
439	REAL(wp) :: zwnorm_f, zwndi_f , zwndj_f ! relative wind module and components at F-point
440	REAL(wp) :: zwndi_t , zwndj_t ! relative wind components at T-point
441	!!---------------------------------------------------------------------
442	!
443	IF( nn_timing == 1 ) CALL timing_start('blk_ice_core_tau')
444	!
445	! local scalars ( place there for vector optimisation purposes)
446	zcoef_wnorm = rhoa * Cice
447	zcoef_wnorm2 = rhoa * Cice * 0.5
448
449	!!gm brutal....
450	utau_ice (:,:) = 0._wp
451	vtau_ice (:,:) = 0._wp
452	wndm_ice (:,:) = 0._wp
453	!!gm end
454
455	! ----------------------------------------------------------------------------- !
456	! Wind components and module relative to the moving ocean ( U10m - U_ice ) !
457	! ----------------------------------------------------------------------------- !
458	SELECT CASE( cp_ice_msh )
459	CASE( 'I' ) ! B-grid ice dynamics : I-point (i.e. F-point with sea-ice indexation)
460	! and scalar wind at T-point ( = \| U10m - U_ice \| ) (masked)
461	DO jj = 2, jpjm1
462	DO ji = 2, jpim1 ! B grid : NO vector opt
463	! ... scalar wind at I-point (fld being at T-point)
464	zwndi_f = 0.25 * ( sf(jp_wndi)%fnow(ji-1,jj ,1) + sf(jp_wndi)%fnow(ji ,jj ,1) &
465	& + sf(jp_wndi)%fnow(ji-1,jj-1,1) + sf(jp_wndi)%fnow(ji ,jj-1,1) ) - rn_vfac * u_ice(ji,jj)
466	zwndj_f = 0.25 * ( sf(jp_wndj)%fnow(ji-1,jj ,1) + sf(jp_wndj)%fnow(ji ,jj ,1) &
467	& + sf(jp_wndj)%fnow(ji-1,jj-1,1) + sf(jp_wndj)%fnow(ji ,jj-1,1) ) - rn_vfac * v_ice(ji,jj)
468	zwnorm_f = zcoef_wnorm * SQRT( zwndi_f * zwndi_f + zwndj_f * zwndj_f )
469	! ... ice stress at I-point
470	utau_ice(ji,jj) = zwnorm_f * zwndi_f
471	vtau_ice(ji,jj) = zwnorm_f * zwndj_f
472	! ... scalar wind at T-point (fld being at T-point)
473	zwndi_t = sf(jp_wndi)%fnow(ji,jj,1) - rn_vfac * 0.25 * ( u_ice(ji,jj+1) + u_ice(ji+1,jj+1) &
474	& + u_ice(ji,jj ) + u_ice(ji+1,jj ) )
475	zwndj_t = sf(jp_wndj)%fnow(ji,jj,1) - rn_vfac * 0.25 * ( v_ice(ji,jj+1) + v_ice(ji+1,jj+1) &
476	& + v_ice(ji,jj ) + v_ice(ji+1,jj ) )
477	wndm_ice(ji,jj) = SQRT( zwndi_t * zwndi_t + zwndj_t * zwndj_t ) * tmask(ji,jj,1)
478	END DO
479	END DO
480	CALL lbc_lnk( utau_ice, 'I', -1. )
481	CALL lbc_lnk( vtau_ice, 'I', -1. )
482	CALL lbc_lnk( wndm_ice, 'T', 1. )
483	!
484	CASE( 'C' ) ! C-grid ice dynamics : U & V-points (same as ocean)
485	DO jj = 2, jpj
486	DO ji = fs_2, jpi ! vect. opt.
487	zwndi_t = ( sf(jp_wndi)%fnow(ji,jj,1) - rn_vfac * 0.5 * ( u_ice(ji-1,jj ) + u_ice(ji,jj) ) )
488	zwndj_t = ( sf(jp_wndj)%fnow(ji,jj,1) - rn_vfac * 0.5 * ( v_ice(ji ,jj-1) + v_ice(ji,jj) ) )
489	wndm_ice(ji,jj) = SQRT( zwndi_t * zwndi_t + zwndj_t * zwndj_t ) * tmask(ji,jj,1)
490	END DO
491	END DO
492	DO jj = 2, jpjm1
493	DO ji = fs_2, fs_jpim1 ! vect. opt.
494	utau_ice(ji,jj) = zcoef_wnorm2 * ( wndm_ice(ji+1,jj ) + wndm_ice(ji,jj) ) &
495	& * ( 0.5 * (sf(jp_wndi)%fnow(ji+1,jj,1) + sf(jp_wndi)%fnow(ji,jj,1) ) - rn_vfac * u_ice(ji,jj) )
496	vtau_ice(ji,jj) = zcoef_wnorm2 * ( wndm_ice(ji,jj+1 ) + wndm_ice(ji,jj) ) &
497	& * ( 0.5 * (sf(jp_wndj)%fnow(ji,jj+1,1) + sf(jp_wndj)%fnow(ji,jj,1) ) - rn_vfac * v_ice(ji,jj) )
498	END DO
499	END DO
500	CALL lbc_lnk( utau_ice, 'U', -1. )
501	CALL lbc_lnk( vtau_ice, 'V', -1. )
502	CALL lbc_lnk( wndm_ice, 'T', 1. )
503	!
504	END SELECT
505
506	IF(ln_ctl) THEN
507	CALL prt_ctl(tab2d_1=utau_ice , clinfo1=' blk_ice_core: utau_ice : ', tab2d_2=vtau_ice , clinfo2=' vtau_ice : ')
508	CALL prt_ctl(tab2d_1=wndm_ice , clinfo1=' blk_ice_core: wndm_ice : ')
509	ENDIF
510
511	IF( nn_timing == 1 ) CALL timing_stop('blk_ice_core_tau')
512
513	END SUBROUTINE blk_ice_core_tau
514
515
516	SUBROUTINE blk_ice_core_flx( ptsu, palb )
517	!!---------------------------------------------------------------------
518	!! * ROUTINE blk_ice_core_flx *
519	!!
520	!! ** Purpose : provide the surface boundary condition over sea-ice
521	!!
522	!! ** Method : compute heat and freshwater exchanged
523	!! between atmosphere and sea-ice using CORE bulk
524	!! formulea, ice variables and read atmmospheric fields.
525	!!
526	!! caution : the net upward water flux has with mm/day unit
527	!!---------------------------------------------------------------------
528	REAL(wp), DIMENSION(:,:,:), INTENT(in) :: ptsu ! sea ice surface temperature
529	REAL(wp), DIMENSION(:,:,:), INTENT(in) :: palb ! ice albedo (all skies)
530	!!
531	INTEGER :: ji, jj, jl ! dummy loop indices
532	REAL(wp) :: zst2, zst3
533	REAL(wp) :: zcoef_dqlw, zcoef_dqla, zcoef_dqsb
534	REAL(wp) :: zztmp, z1_lsub ! temporary variable
535	!!
536	REAL(wp), DIMENSION(:,:,:), POINTER :: z_qlw ! long wave heat flux over ice
537	REAL(wp), DIMENSION(:,:,:), POINTER :: z_qsb ! sensible heat flux over ice
538	REAL(wp), DIMENSION(:,:,:), POINTER :: z_dqlw ! long wave heat sensitivity over ice
539	REAL(wp), DIMENSION(:,:,:), POINTER :: z_dqsb ! sensible heat sensitivity over ice
540	REAL(wp), DIMENSION(:,:) , POINTER :: zevap, zsnw ! evaporation and snw distribution after wind blowing (LIM3)
541	!!---------------------------------------------------------------------
542	!
543	IF( nn_timing == 1 ) CALL timing_start('blk_ice_core_flx')
544	!
545	CALL wrk_alloc( jpi,jpj,jpl, z_qlw, z_qsb, z_dqlw, z_dqsb )
546
547	! local scalars ( place there for vector optimisation purposes)
548	zcoef_dqlw = 4.0 * 0.95 * Stef
549	zcoef_dqla = -Ls * Cice * 11637800. * (-5897.8)
550	zcoef_dqsb = rhoa * cpa * Cice
551
552	zztmp = 1. / ( 1. - albo )
553	! ! ========================== !
554	DO jl = 1, jpl ! Loop over ice categories !
555	! ! ========================== !
556	DO jj = 1 , jpj
557	DO ji = 1, jpi
558	! ----------------------------!
559	! I Radiative FLUXES !
560	! ----------------------------!
561	zst2 = ptsu(ji,jj,jl) * ptsu(ji,jj,jl)
562	zst3 = ptsu(ji,jj,jl) * zst2
563	! Short Wave (sw)
564	qsr_ice(ji,jj,jl) = zztmp * ( 1. - palb(ji,jj,jl) ) * qsr(ji,jj)
565	! Long Wave (lw)
566	z_qlw(ji,jj,jl) = 0.95 * ( sf(jp_qlw)%fnow(ji,jj,1) - Stef * ptsu(ji,jj,jl) * zst3 ) * tmask(ji,jj,1)
567	! lw sensitivity
568	z_dqlw(ji,jj,jl) = zcoef_dqlw * zst3
569
570	! ----------------------------!
571	! II Turbulent FLUXES !
572	! ----------------------------!
573
574	! ... turbulent heat fluxes
575	! Sensible Heat
576	z_qsb(ji,jj,jl) = rhoa * cpa * Cice * wndm_ice(ji,jj) * ( ptsu(ji,jj,jl) - sf(jp_tair)%fnow(ji,jj,1) )
577	! Latent Heat
578	qla_ice(ji,jj,jl) = rn_efac * MAX( 0.e0, rhoa * Ls * Cice * wndm_ice(ji,jj) &
579	& * ( 11637800. * EXP( -5897.8 / ptsu(ji,jj,jl) ) / rhoa - sf(jp_humi)%fnow(ji,jj,1) ) )
580	! Latent heat sensitivity for ice (Dqla/Dt)
581	IF( qla_ice(ji,jj,jl) > 0._wp ) THEN
582	dqla_ice(ji,jj,jl) = rn_efac * zcoef_dqla * wndm_ice(ji,jj) / ( zst2 ) * EXP( -5897.8 / ptsu(ji,jj,jl) )
583	ELSE
584	dqla_ice(ji,jj,jl) = 0._wp
585	ENDIF
586
587	! Sensible heat sensitivity (Dqsb_ice/Dtn_ice)
588	z_dqsb(ji,jj,jl) = zcoef_dqsb * wndm_ice(ji,jj)
589
590	! ----------------------------!
591	! III Total FLUXES !
592	! ----------------------------!
593	! Downward Non Solar flux
594	qns_ice (ji,jj,jl) = z_qlw (ji,jj,jl) - z_qsb (ji,jj,jl) - qla_ice (ji,jj,jl)
595	! Total non solar heat flux sensitivity for ice
596	dqns_ice(ji,jj,jl) = - ( z_dqlw(ji,jj,jl) + z_dqsb(ji,jj,jl) + dqla_ice(ji,jj,jl) )
597	END DO
598	!
599	END DO
600	!
601	END DO
602	!
603	tprecip(:,:) = sf(jp_prec)%fnow(:,:,1) * rn_pfac ! total precipitation [kg/m2/s]
604	sprecip(:,:) = sf(jp_snow)%fnow(:,:,1) * rn_pfac ! solid precipitation [kg/m2/s]
605	CALL iom_put( 'snowpre', sprecip * 86400. ) ! Snow precipitation
606	CALL iom_put( 'precip' , tprecip * 86400. ) ! Total precipitation
607
608	#if defined key_lim3
609	CALL wrk_alloc( jpi,jpj, zevap, zsnw )
610
611	! --- evaporation --- !
612	z1_lsub = 1._wp / Lsub
613	evap_ice (:,:,:) = qla_ice (:,:,:) * z1_lsub ! sublimation
614	devap_ice(:,:,:) = dqla_ice(:,:,:) * z1_lsub
615	zevap (:,:) = emp(:,:) + tprecip(:,:) ! evaporation over ocean
616
617	! --- evaporation minus precipitation --- !
618	CALL lim_thd_snwblow( pfrld, zsnw ) ! snow distribution over ice after wind blowing
619	emp_oce(:,:) = pfrld(:,:) * zevap(:,:) - ( tprecip(:,:) - sprecip(:,:) ) - sprecip(:,:) * (1._wp - zsnw )
620	emp_ice(:,:) = SUM( a_i_b(:,:,:) * evap_ice(:,:,:), dim=3 ) - sprecip(:,:) * zsnw
621	emp_tot(:,:) = emp_oce(:,:) + emp_ice(:,:)
622
623	! --- heat flux associated with emp --- !
624	qemp_oce(:,:) = - pfrld(:,:) * zevap(:,:) * sst_m(:,:) * rcp & ! evap at sst
625	& + ( tprecip(:,:) - sprecip(:,:) ) * ( sf(jp_tair)%fnow(:,:,1) - rt0 ) * rcp & ! liquid precip at Tair
626	& + sprecip(:,:) * ( 1._wp - zsnw ) * & ! solid precip at min(Tair,Tsnow)
627	& ( ( MIN( sf(jp_tair)%fnow(:,:,1), rt0_snow ) - rt0 ) * cpic * tmask(:,:,1) - lfus )
628	qemp_ice(:,:) = sprecip(:,:) * zsnw * & ! solid precip (only)
629	& ( ( MIN( sf(jp_tair)%fnow(:,:,1), rt0_snow ) - rt0 ) * cpic * tmask(:,:,1) - lfus )
630
631	! --- total solar and non solar fluxes --- !
632	qns_tot(:,:) = pfrld(:,:) * qns_oce(:,:) + SUM( a_i_b(:,:,:) * qns_ice(:,:,:), dim=3 ) + qemp_ice(:,:) + qemp_oce(:,:)
633	qsr_tot(:,:) = pfrld(:,:) * qsr_oce(:,:) + SUM( a_i_b(:,:,:) * qsr_ice(:,:,:), dim=3 )
634
635	! --- heat content of precip over ice in J/m3 (to be used in 1D-thermo) --- !
636	qprec_ice(:,:) = rhosn * ( ( MIN( sf(jp_tair)%fnow(:,:,1), rt0_snow ) - rt0 ) * cpic * tmask(:,:,1) - lfus )
637
638	CALL wrk_dealloc( jpi,jpj, zevap, zsnw )
639	#endif
640
641	!--------------------------------------------------------------------
642	! FRACTIONs of net shortwave radiation which is not absorbed in the
643	! thin surface layer and penetrates inside the ice cover
644	! ( Maykut and Untersteiner, 1971 ; Ebert and Curry, 1993 )
645	!
646	fr1_i0(:,:) = ( 0.18 * ( 1.0 - cldf_ice ) + 0.35 * cldf_ice )
647	fr2_i0(:,:) = ( 0.82 * ( 1.0 - cldf_ice ) + 0.65 * cldf_ice )
648	!
649	!
650	IF(ln_ctl) THEN
651	CALL prt_ctl(tab3d_1=qla_ice , clinfo1=' blk_ice_core: qla_ice : ', tab3d_2=z_qsb , clinfo2=' z_qsb : ', kdim=jpl)
652	CALL prt_ctl(tab3d_1=z_qlw , clinfo1=' blk_ice_core: z_qlw : ', tab3d_2=dqla_ice, clinfo2=' dqla_ice : ', kdim=jpl)
653	CALL prt_ctl(tab3d_1=z_dqsb , clinfo1=' blk_ice_core: z_dqsb : ', tab3d_2=z_dqlw , clinfo2=' z_dqlw : ', kdim=jpl)
654	CALL prt_ctl(tab3d_1=dqns_ice, clinfo1=' blk_ice_core: dqns_ice : ', tab3d_2=qsr_ice , clinfo2=' qsr_ice : ', kdim=jpl)
655	CALL prt_ctl(tab3d_1=ptsu , clinfo1=' blk_ice_core: ptsu : ', tab3d_2=qns_ice , clinfo2=' qns_ice : ', kdim=jpl)
656	CALL prt_ctl(tab2d_1=tprecip , clinfo1=' blk_ice_core: tprecip : ', tab2d_2=sprecip , clinfo2=' sprecip : ')
657	ENDIF
658
659	CALL wrk_dealloc( jpi,jpj,jpl, z_qlw, z_qsb, z_dqlw, z_dqsb )
660	!
661	IF( nn_timing == 1 ) CALL timing_stop('blk_ice_core_flx')
662
663	END SUBROUTINE blk_ice_core_flx
664	#endif
665
666
667	SUBROUTINE blk_bio_meanqsr
668	!!---------------------------------------------------------------------
669	!! *** ROUTINE blk_bio_meanqsr
670	!!
671	!! ** Purpose : provide daily qsr_mean for PISCES when
672	!! analytic diurnal cycle is applied in physic
673	!!
674	!! ** Method : add part where there is no ice
675	!!
676	!!---------------------------------------------------------------------
677	IF( nn_timing == 1 ) CALL timing_start('blk_bio_meanqsr')
678	!
679	qsr_mean(:,:) = (1. - albo ) * sf(jp_qsr)%fnow(:,:,1)
680	!
681	IF( nn_timing == 1 ) CALL timing_stop('blk_bio_meanqsr')
682	!
683	END SUBROUTINE blk_bio_meanqsr
684
685
686	SUBROUTINE blk_ice_meanqsr( palb, p_qsr_mean, pdim )
687	!!---------------------------------------------------------------------
688	!!
689	!! ** Purpose : provide the daily qsr_mean over sea_ice for PISCES when
690	!! analytic diurnal cycle is applied in physic
691	!!
692	!! ** Method : compute qsr
693	!!
694	!!---------------------------------------------------------------------
695	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: palb ! ice albedo (clear sky) (alb_ice_cs) [%]
696	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qsr_mean ! solar heat flux over ice (T-point) [W/m2]
697	INTEGER , INTENT(in ) :: pdim ! number of ice categories
698	!
699	INTEGER :: ijpl ! number of ice categories (size of 3rd dim of input arrays)
700	INTEGER :: ji, jj, jl ! dummy loop indices
701	REAL(wp) :: zztmp ! temporary variable
702	!!---------------------------------------------------------------------
703	IF( nn_timing == 1 ) CALL timing_start('blk_ice_meanqsr')
704	!
705	ijpl = pdim ! number of ice categories
706	zztmp = 1. / ( 1. - albo )
707	! ! ========================== !
708	DO jl = 1, ijpl ! Loop over ice categories !
709	! ! ========================== !
710	DO jj = 1 , jpj
711	DO ji = 1, jpi
712	p_qsr_mean(ji,jj,jl) = zztmp * ( 1. - palb(ji,jj,jl) ) * qsr_mean(ji,jj)
713	END DO
714	END DO
715	END DO
716	!
717	IF( nn_timing == 1 ) CALL timing_stop('blk_ice_meanqsr')
718	!
719	END SUBROUTINE blk_ice_meanqsr
720
721
722	SUBROUTINE turb_core_2z( zt, zu, sst, T_zt, q_sat, q_zt, dU, &
723	& Cd, Ch, Ce , T_zu, q_zu )
724	!!----------------------------------------------------------------------
725	!! * ROUTINE turb_core *
726	!!
727	!! ** Purpose : Computes turbulent transfert coefficients of surface
728	!! fluxes according to Large & Yeager (2004) and Large & Yeager (2008)
729	!! If relevant (zt /= zu), adjust temperature and humidity from height zt to zu
730	!!
731	!! ** Method : Monin Obukhov Similarity Theory
732	!! + Large & Yeager (2004,2008) closure: CD_n10 = f(U_n10)
733	!!
734	!! ** References : Large & Yeager, 2004 / Large & Yeager, 2008
735	!!
736	!! ** Last update: Laurent Brodeau, June 2014:
737	!! - handles both cases zt=zu and zt/=zu
738	!! - optimized: less 2D arrays allocated and less operations
739	!! - better first guess of stability by checking air-sea difference of virtual temperature
740	!! rather than temperature difference only...
741	!! - added function "cd_neutral_10m" that uses the improved parametrization of
742	!! Large & Yeager 2008. Drag-coefficient reduction for Cyclone conditions!
743	!! - using code-wide physical constants defined into "phycst.mod" rather than redifining them
744	!! => 'vkarmn' and 'grav'
745	!!----------------------------------------------------------------------
746	REAL(wp), INTENT(in ) :: zt ! height for T_zt and q_zt [m]
747	REAL(wp), INTENT(in ) :: zu ! height for dU [m]
748	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: sst ! sea surface temperature [Kelvin]
749	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: T_zt ! potential air temperature [Kelvin]
750	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: q_sat ! sea surface specific humidity [kg/kg]
751	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: q_zt ! specific air humidity [kg/kg]
752	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: dU ! relative wind module at zu [m/s]
753	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: Cd ! transfer coefficient for momentum (tau)
754	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: Ch ! transfer coefficient for sensible heat (Q_sens)
755	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: Ce ! transfert coefficient for evaporation (Q_lat)
756	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: T_zu ! air temp. shifted at zu [K]
757	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: q_zu ! spec. hum. shifted at zu [kg/kg]
758	!
759	INTEGER :: j_itt
760	INTEGER , PARAMETER :: nb_itt = 5 ! number of itterations
761	LOGICAL :: l_zt_equal_zu = .FALSE. ! if q and t are given at different height than U
762	!
763	REAL(wp), DIMENSION(:,:), POINTER :: U_zu ! relative wind at zu [m/s]
764	REAL(wp), DIMENSION(:,:), POINTER :: Ce_n10 ! 10m neutral latent coefficient
765	REAL(wp), DIMENSION(:,:), POINTER :: Ch_n10 ! 10m neutral sensible coefficient
766	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd_n10 ! root square of Cd_n10
767	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd ! root square of Cd
768	REAL(wp), DIMENSION(:,:), POINTER :: zeta_u ! stability parameter at height zu
769	REAL(wp), DIMENSION(:,:), POINTER :: zeta_t ! stability parameter at height zt
770	REAL(wp), DIMENSION(:,:), POINTER :: zpsi_h_u, zpsi_m_u
771	REAL(wp), DIMENSION(:,:), POINTER :: ztmp0, ztmp1, ztmp2
772	REAL(wp), DIMENSION(:,:), POINTER :: stab ! 1st stability test integer
773	!!----------------------------------------------------------------------
774
775	IF( nn_timing == 1 ) CALL timing_start('turb_core_2z')
776
777	CALL wrk_alloc( jpi,jpj, U_zu, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd )
778	CALL wrk_alloc( jpi,jpj, zeta_u, stab )
779	CALL wrk_alloc( jpi,jpj, zpsi_h_u, zpsi_m_u, ztmp0, ztmp1, ztmp2 )
780
781	l_zt_equal_zu = .FALSE.
782	IF( ABS(zu - zt) < 0.01 ) l_zt_equal_zu = .TRUE. ! testing "zu == zt" is risky with double precision
783
784	IF( .NOT. l_zt_equal_zu ) CALL wrk_alloc( jpi,jpj, zeta_t )
785
786	U_zu = MAX( 0.5 , dU ) ! relative wind speed at zu (normally 10m), we don't want to fall under 0.5 m/s
787
788	!! First guess of stability:
789	ztmp0 = T_zt(1. + 0.608q_zt) - sst(1. + 0.608q_sat) ! air-sea difference of virtual pot. temp. at zt
790	stab = 0.5 + sign(0.5,ztmp0) ! stab = 1 if dTv > 0 => STABLE, 0 if unstable
791
792	!! Neutral coefficients at 10m:
793	IF( ln_cdgw ) THEN ! wave drag case
794	cdn_wave(:,:) = cdn_wave(:,:) + rsmall * ( 1._wp - tmask(:,:,1) )
795	ztmp0 (:,:) = cdn_wave(:,:)
796	ELSE
797	ztmp0 = cd_neutral_10m( U_zu )
798	ENDIF
799	sqrt_Cd_n10 = SQRT( ztmp0 )
800	Ce_n10 = 1.e-3( 34.6 sqrt_Cd_n10 )
801	Ch_n10 = 1.e-3sqrt_Cd_n10(18.stab + 32.7(1. - stab))
802
803	!! Initializing transf. coeff. with their first guess neutral equivalents :
804	Cd = ztmp0 ; Ce = Ce_n10 ; Ch = Ch_n10 ; sqrt_Cd = sqrt_Cd_n10
805
806	!! Initializing values at z_u with z_t values:
807	T_zu = T_zt ; q_zu = q_zt
808
809	!! * Now starting iteration loop
810	DO j_itt=1, nb_itt
811	!
812	ztmp1 = T_zu - sst ! Updating air/sea differences
813	ztmp2 = q_zu - q_sat
814
815	! Updating turbulent scales : (L&Y 2004 eq. (7))
816	ztmp1 = Ch/sqrt_Cdztmp1 ! theta
817	ztmp2 = Ce/sqrt_Cdztmp2 ! q
818
819	ztmp0 = T_zu(1. + 0.608q_zu) ! virtual potential temperature at zu
820
821	! Estimate the inverse of Monin-Obukov length (1/L) at height zu:
822	ztmp0 = (vkarmngrav/ztmp0(ztmp1(1.+0.608q_zu) + 0.608T_zuztmp2)) / (CdU_zuU_zu)
823	! ( CdU_zuU_zu is U*^2 at zu)
824
825	!! Stability parameters :
826	zeta_u = zu*ztmp0 ; zeta_u = sign( min(abs(zeta_u),10.0), zeta_u )
827	zpsi_h_u = psi_h( zeta_u )
828	zpsi_m_u = psi_m( zeta_u )
829
830	!! Shifting temperature and humidity at zu (L&Y 2004 eq. (9b-9c))
831	IF ( .NOT. l_zt_equal_zu ) THEN
832	zeta_t = zt*ztmp0 ; zeta_t = sign( min(abs(zeta_t),10.0), zeta_t )
833	stab = LOG(zu/zt) - zpsi_h_u + psi_h(zeta_t) ! stab just used as temp array!!!
834	T_zu = T_zt + ztmp1/vkarmnstab ! ztmp1 is still theta
835	q_zu = q_zt + ztmp2/vkarmnstab ! ztmp2 is still q
836	q_zu = max(0., q_zu)
837	END IF
838
839	IF( ln_cdgw ) THEN ! surface wave case
840	sqrt_Cd = vkarmn / ( vkarmn / sqrt_Cd_n10 - zpsi_m_u )
841	Cd = sqrt_Cd * sqrt_Cd
842	ELSE
843	! Update neutral wind speed at 10m and neutral Cd at 10m (L&Y 2004 eq. 9a)...
844	! In very rare low-wind conditions, the old way of estimating the
845	! neutral wind speed at 10m leads to a negative value that causes the code
846	! to crash. To prevent this a threshold of 0.25m/s is imposed.
847	ztmp0 = MAX( 0.25 , U_zu/(1. + sqrt_Cd_n10/vkarmn*(LOG(zu/10.) - zpsi_m_u)) ) ! U_n10
848	ztmp0 = cd_neutral_10m(ztmp0) ! Cd_n10
849	sqrt_Cd_n10 = sqrt(ztmp0)
850
851	Ce_n10 = 1.e-3 * (34.6 * sqrt_Cd_n10) ! L&Y 2004 eq. (6b)
852	stab = 0.5 + sign(0.5,zeta_u) ! update stability
853	Ch_n10 = 1.e-3sqrt_Cd_n10(18.stab + 32.7(1. - stab)) ! L&Y 2004 eq. (6c-6d)
854
855	!! Update of transfer coefficients:
856	ztmp1 = 1. + sqrt_Cd_n10/vkarmn*(LOG(zu/10.) - zpsi_m_u) ! L&Y 2004 eq. (10a)
857	Cd = ztmp0 / ( ztmp1*ztmp1 )
858	sqrt_Cd = SQRT( Cd )
859	ENDIF
860	!
861	ztmp0 = (LOG(zu/10.) - zpsi_h_u) / vkarmn / sqrt_Cd_n10
862	ztmp2 = sqrt_Cd / sqrt_Cd_n10
863	ztmp1 = 1. + Ch_n10*ztmp0
864	Ch = Ch_n10*ztmp2 / ztmp1 ! L&Y 2004 eq. (10b)
865	!
866	ztmp1 = 1. + Ce_n10*ztmp0
867	Ce = Ce_n10*ztmp2 / ztmp1 ! L&Y 2004 eq. (10c)
868	!
869	END DO
870
871	CALL wrk_dealloc( jpi,jpj, U_zu, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd )
872	CALL wrk_dealloc( jpi,jpj, zeta_u, stab )
873	CALL wrk_dealloc( jpi,jpj, zpsi_h_u, zpsi_m_u, ztmp0, ztmp1, ztmp2 )
874
875	IF( .NOT. l_zt_equal_zu ) CALL wrk_dealloc( jpi,jpj, zeta_t )
876
877	IF( nn_timing == 1 ) CALL timing_stop('turb_core_2z')
878	!
879	END SUBROUTINE turb_core_2z
880
881
882	FUNCTION cd_neutral_10m( zw10 )
883	!!----------------------------------------------------------------------
884	!! Estimate of the neutral drag coefficient at 10m as a function
885	!! of neutral wind speed at 10m
886	!!
887	!! Origin: Large & Yeager 2008 eq.(11a) and eq.(11b)
888	!!
889	!! Author: L. Brodeau, june 2014
890	!!----------------------------------------------------------------------
891	REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: zw10 ! scalar wind speed at 10m (m/s)
892	REAL(wp), DIMENSION(jpi,jpj) :: cd_neutral_10m
893	!
894	REAL(wp), DIMENSION(:,:), POINTER :: rgt33
895	!!----------------------------------------------------------------------
896	!
897	CALL wrk_alloc( jpi,jpj, rgt33 )
898	!
899	!! When wind speed > 33 m/s => Cyclone conditions => special treatment
900	rgt33 = 0.5_wp + SIGN( 0.5_wp, (zw10 - 33._wp) ) ! If zw10 < 33. => 0, else => 1
901	cd_neutral_10m = 1.e-3 * ( &
902	& (1._wp - rgt33)( 2.7_wp/zw10 + 0.142_wp + zw10/13.09_wp - 3.14807E-10zw10**6) & ! zw10< 33.
903	& + rgt33 * 2.34 ) ! zw10 >= 33.
904	!
905	CALL wrk_dealloc( jpi,jpj, rgt33)
906	!
907	END FUNCTION cd_neutral_10m
908
909
910	FUNCTION psi_m(pta) !! Psis, L&Y 2004 eq. (8c), (8d), (8e)
911	!-------------------------------------------------------------------------------
912	! universal profile stability function for momentum
913	!-------------------------------------------------------------------------------
914	REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: pta
915	!
916	REAL(wp), DIMENSION(jpi,jpj) :: psi_m
917	REAL(wp), DIMENSION(:,:), POINTER :: X2, X, stabit
918	!-------------------------------------------------------------------------------
919	!
920	CALL wrk_alloc( jpi,jpj, X2, X, stabit )
921	!
922	X2 = SQRT( ABS( 1. - 16.*pta ) ) ; X2 = MAX( X2 , 1. ) ; X = SQRT( X2 )
923	stabit = 0.5 + SIGN( 0.5 , pta )
924	psi_m = -5.ptastabit & ! Stable
925	& + (1. - stabit)(2.LOG((1. + X)0.5) + LOG((1. + X2)0.5) - 2.ATAN(X) + rpi0.5) ! Unstable
926	!
927	CALL wrk_dealloc( jpi,jpj, X2, X, stabit )
928	!
929	END FUNCTION psi_m
930
931
932	FUNCTION psi_h( pta ) !! Psis, L&Y 2004 eq. (8c), (8d), (8e)
933	!-------------------------------------------------------------------------------
934	! universal profile stability function for temperature and humidity
935	!-------------------------------------------------------------------------------
936	REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: pta
937	!
938	REAL(wp), DIMENSION(jpi,jpj) :: psi_h
939	REAL(wp), DIMENSION(:,:), POINTER :: X2, X, stabit
940	!-------------------------------------------------------------------------------
941	!
942	CALL wrk_alloc( jpi,jpj, X2, X, stabit )
943	!
944	X2 = SQRT( ABS( 1. - 16.*pta ) ) ; X2 = MAX( X2 , 1. ) ; X = SQRT( X2 )
945	stabit = 0.5 + SIGN( 0.5 , pta )
946	psi_h = -5.ptastabit & ! Stable
947	& + (1. - stabit)(2.LOG( (1. + X2)*0.5 )) ! Unstable
948	!
949	CALL wrk_dealloc( jpi,jpj, X2, X, stabit )
950	!
951	END FUNCTION psi_h
952
953	!!======================================================================
954	END MODULE sbcblk_core

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

Download in other formats: