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/2014/dev_4728_CNRS04_coupled_interface/NEMOGCM/NEMO/OPA_SRC/SBC – NEMO

Context Navigation

source: branches/2014/dev_4728_CNRS04_coupled_interface/NEMOGCM/NEMO/OPA_SRC/SBC/sbcblk_core.F90 @ 4859

Last change on this file since 4859 was 4859, checked in by smasson, 9 years ago
dev_4728_CNRS04_coupled_interface: cleaning of the coupling interface for OASIS3-MCT. 2
Property svn:keywords set to `Id`
File size: 58.6 KB

Line
1	MODULE sbcblk_core
2	!!======================================================================
3	!! * MODULE sbcblk_core *
4	!! Ocean forcing: momentum, heat and freshwater flux formulation
5	!!=====================================================================
6	!! History : 1.0 ! 2004-08 (U. Schweckendiek) Original code
7	!! 2.0 ! 2005-04 (L. Brodeau, A.M. Treguier) additions:
8	!! - new bulk routine for efficiency
9	!! - WINDS ARE NOW ASSUMED TO BE AT T POINTS in input files !!!!
10	!! - file names and file characteristics in namelist
11	!! - Implement reading of 6-hourly fields
12	!! 3.0 ! 2006-06 (G. Madec) sbc rewritting
13	!! - ! 2006-12 (L. Brodeau) Original code for TURB_CORE_2Z
14	!! 3.2 ! 2009-04 (B. Lemaire) Introduce iom_put
15	!! 3.3 ! 2010-10 (S. Masson) add diurnal cycle
16	!! 3.4 ! 2011-11 (C. Harris) Fill arrays required by CICE
17	!!----------------------------------------------------------------------
18
19	!!----------------------------------------------------------------------
20	!! sbc_blk_core : bulk formulation as ocean surface boundary condition
21	!! (forced mode, CORE bulk formulea)
22	!! blk_oce_core : ocean: computes momentum, heat and freshwater fluxes
23	!! blk_ice_core : ice : computes momentum, heat and freshwater fluxes
24	!! turb_core : computes the CORE turbulent transfer coefficients
25	!!----------------------------------------------------------------------
26	USE oce ! ocean dynamics and tracers
27	USE dom_oce ! ocean space and time domain
28	USE phycst ! physical constants
29	USE fldread ! read input fields
30	USE sbc_oce ! Surface boundary condition: ocean fields
31	USE cyclone ! Cyclone 10m wind form trac of cyclone centres
32	USE sbcdcy ! surface boundary condition: diurnal cycle
33	USE iom ! I/O manager library
34	USE in_out_manager ! I/O manager
35	USE lib_mpp ! distribued memory computing library
36	USE wrk_nemo ! work arrays
37	USE timing ! Timing
38	USE lbclnk ! ocean lateral boundary conditions (or mpp link)
39	USE prtctl ! Print control
40	USE sbcwave,ONLY : cdn_wave !wave module
41	USE sbc_ice ! Surface boundary condition: ice fields
42	USE lib_fortran ! to use key_nosignedzero
43
44	IMPLICIT NONE
45	PRIVATE
46
47	PUBLIC sbc_blk_core ! routine called in sbcmod module
48	PUBLIC blk_ice_core ! routine called in sbc_ice_lim module
49	PUBLIC blk_ice_meanqsr ! routine called in sbc_ice_lim module
50	PUBLIC turb_core_2z ! routine calles in sbcblk_mfs module
51
52	INTEGER , PARAMETER :: jpfld = 9 ! maximum number of files to read
53	INTEGER , PARAMETER :: jp_wndi = 1 ! index of 10m wind velocity (i-component) (m/s) at T-point
54	INTEGER , PARAMETER :: jp_wndj = 2 ! index of 10m wind velocity (j-component) (m/s) at T-point
55	INTEGER , PARAMETER :: jp_humi = 3 ! index of specific humidity ( % )
56	INTEGER , PARAMETER :: jp_qsr = 4 ! index of solar heat (W/m2)
57	INTEGER , PARAMETER :: jp_qlw = 5 ! index of Long wave (W/m2)
58	INTEGER , PARAMETER :: jp_tair = 6 ! index of 10m air temperature (Kelvin)
59	INTEGER , PARAMETER :: jp_prec = 7 ! index of total precipitation (rain+snow) (Kg/m2/s)
60	INTEGER , PARAMETER :: jp_snow = 8 ! index of snow (solid prcipitation) (kg/m2/s)
61	INTEGER , PARAMETER :: jp_tdif = 9 ! index of tau diff associated to HF tau (N/m2) at T-point
62
63	TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf ! structure of input fields (file informations, fields read)
64
65	! !!! CORE bulk parameters
66	REAL(wp), PARAMETER :: rhoa = 1.22 ! air density
67	REAL(wp), PARAMETER :: cpa = 1000.5 ! specific heat of air
68	REAL(wp), PARAMETER :: Lv = 2.5e6 ! latent heat of vaporization
69	REAL(wp), PARAMETER :: Ls = 2.839e6 ! latent heat of sublimation
70	REAL(wp), PARAMETER :: Stef = 5.67e-8 ! Stefan Boltzmann constant
71	REAL(wp), PARAMETER :: Cice = 1.4e-3 ! iovi 1.63e-3 ! transfer coefficient over ice
72	REAL(wp), PARAMETER :: albo = 0.066 ! ocean albedo assumed to be constant
73
74	! !!* Namelist namsbc_core : CORE bulk parameters
75	LOGICAL :: ln_2m ! logical flag for height of air temp. and hum
76	LOGICAL :: ln_taudif ! logical flag to use the "mean of stress module - module of mean stress" data
77	REAL(wp) :: rn_pfac ! multiplication factor for precipitation
78	REAL(wp) :: rn_efac ! multiplication factor for evaporation (clem)
79	REAL(wp) :: rn_vfac ! multiplication factor for ice/ocean velocity in the calculation of wind stress (clem)
80	LOGICAL :: ln_bulk2z ! logical flag for case where z(q,t) and z(u) are specified in the namelist
81	REAL(wp) :: rn_zqt ! z(q,t) : height of humidity and temperature measurements
82	REAL(wp) :: rn_zu ! z(u) : height of wind measurements
83
84	!! * Substitutions
85	# include "domzgr_substitute.h90"
86	# include "vectopt_loop_substitute.h90"
87	!!----------------------------------------------------------------------
88	!! NEMO/OPA 3.3 , NEMO-consortium (2010)
89	!! $Id$
90	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
91	!!----------------------------------------------------------------------
92	CONTAINS
93
94	SUBROUTINE sbc_blk_core( kt )
95	!!---------------------------------------------------------------------
96	!! * ROUTINE sbc_blk_core *
97	!!
98	!! ** Purpose : provide at each time step the surface ocean fluxes
99	!! (momentum, heat, freshwater and runoff)
100	!!
101	!! ** Method : (1) READ each fluxes in NetCDF files:
102	!! the 10m wind velocity (i-component) (m/s) at T-point
103	!! the 10m wind velocity (j-component) (m/s) at T-point
104	!! the 10m or 2m specific humidity ( % )
105	!! the solar heat (W/m2)
106	!! the Long wave (W/m2)
107	!! the 10m or 2m air temperature (Kelvin)
108	!! the total precipitation (rain+snow) (Kg/m2/s)
109	!! the snow (solid prcipitation) (kg/m2/s)
110	!! the tau diff associated to HF tau (N/m2) at T-point (ln_taudif=T)
111	!! (2) CALL blk_oce_core
112	!!
113	!! C A U T I O N : never mask the surface stress fields
114	!! the stress is assumed to be in the (i,j) mesh referential
115	!!
116	!! ** Action : defined at each time-step at the air-sea interface
117	!! - utau, vtau i- and j-component of the wind stress
118	!! - taum, wndm wind stress and 10m wind modules at T-point
119	!! - qns, qsr non-solar and solar heat fluxes
120	!! - emp upward mass flux (evapo. - precip.)
121	!! - sfx salt flux due to freezing/melting (non-zero only if ice is present)
122	!! (set in limsbc(_2).F90)
123	!!----------------------------------------------------------------------
124	INTEGER, INTENT(in) :: kt ! ocean time step
125	!!
126	INTEGER :: ierror ! return error code
127	INTEGER :: ifpr ! dummy loop indice
128	INTEGER :: jfld ! dummy loop arguments
129	INTEGER :: ios ! Local integer output status for namelist read
130	!!
131	CHARACTER(len=100) :: cn_dir ! Root directory for location of core files
132	TYPE(FLD_N), DIMENSION(jpfld) :: slf_i ! array of namelist informations on the fields to read
133	TYPE(FLD_N) :: sn_wndi, sn_wndj, sn_humi, sn_qsr ! informations about the fields to be read
134	TYPE(FLD_N) :: sn_qlw , sn_tair, sn_prec, sn_snow ! " "
135	TYPE(FLD_N) :: sn_tdif ! " "
136	NAMELIST/namsbc_core/ cn_dir , ln_2m , ln_taudif, rn_pfac, rn_efac, rn_vfac, &
137	& sn_wndi, sn_wndj, sn_humi , sn_qsr , &
138	& sn_qlw , sn_tair, sn_prec , sn_snow, &
139	& sn_tdif, rn_zqt , ln_bulk2z, rn_zu
140	!!---------------------------------------------------------------------
141
142	! ! ====================== !
143	IF( kt == nit000 ) THEN ! First call kt=nit000 !
144	! ! ====================== !
145	!
146	REWIND( numnam_ref ) ! Namelist namsbc_core in reference namelist : CORE bulk parameters
147	READ ( numnam_ref, namsbc_core, IOSTAT = ios, ERR = 901)
148	901 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_core in reference namelist', lwp )
149
150	REWIND( numnam_cfg ) ! Namelist namsbc_core in configuration namelist : CORE bulk parameters
151	READ ( numnam_cfg, namsbc_core, IOSTAT = ios, ERR = 902 )
152	902 IF( ios /= 0 ) CALL ctl_nam ( ios , 'namsbc_core in configuration namelist', lwp )
153
154	IF(lwm) WRITE ( numond, namsbc_core )
155	! ! check: do we plan to use ln_dm2dc with non-daily forcing?
156	IF( ln_dm2dc .AND. sn_qsr%nfreqh /= 24 ) &
157	& CALL ctl_stop( 'sbc_blk_core: ln_dm2dc can be activated only with daily short-wave forcing' )
158	IF( ln_dm2dc .AND. sn_qsr%ln_tint ) THEN
159	CALL ctl_warn( 'sbc_blk_core: ln_dm2dc is taking care of the temporal interpolation of daily qsr', &
160	& ' ==> We force time interpolation = .false. for qsr' )
161	sn_qsr%ln_tint = .false.
162	ENDIF
163	! ! store namelist information in an array
164	slf_i(jp_wndi) = sn_wndi ; slf_i(jp_wndj) = sn_wndj
165	slf_i(jp_qsr ) = sn_qsr ; slf_i(jp_qlw ) = sn_qlw
166	slf_i(jp_tair) = sn_tair ; slf_i(jp_humi) = sn_humi
167	slf_i(jp_prec) = sn_prec ; slf_i(jp_snow) = sn_snow
168	slf_i(jp_tdif) = sn_tdif
169	!
170	lhftau = ln_taudif ! do we use HF tau information?
171	jfld = jpfld - COUNT( (/.NOT. lhftau/) )
172	!
173	ALLOCATE( sf(jfld), STAT=ierror ) ! set sf structure
174	IF( ierror > 0 ) CALL ctl_stop( 'STOP', 'sbc_blk_core: unable to allocate sf structure' )
175	DO ifpr= 1, jfld
176	ALLOCATE( sf(ifpr)%fnow(jpi,jpj,1) )
177	IF( slf_i(ifpr)%ln_tint ) ALLOCATE( sf(ifpr)%fdta(jpi,jpj,1,2) )
178	END DO
179	! ! fill sf with slf_i and control print
180	CALL fld_fill( sf, slf_i, cn_dir, 'sbc_blk_core', 'flux formulation for ocean surface boundary condition', 'namsbc_core' )
181	!
182	sfx(:,:) = 0._wp ! salt flux; zero unless ice is present (computed in limsbc(_2).F90)
183	!
184	ENDIF
185
186	CALL fld_read( kt, nn_fsbc, sf ) ! input fields provided at the current time-step
187
188	! ! compute the surface ocean fluxes using CORE bulk formulea
189	IF( MOD( kt - 1, nn_fsbc ) == 0 ) CALL blk_oce_core( kt, sf, sst_m, ssu_m, ssv_m )
190
191	! If diurnal cycle is activated, compute a daily mean short waves flux for biogeochemistery
192	IF( ltrcdm2dc ) CALL blk_bio_meanqsr
193
194	#if defined key_cice
195	IF( MOD( kt - 1, nn_fsbc ) == 0 ) THEN
196	qlw_ice(:,:,1) = sf(jp_qlw)%fnow(:,:,1)
197	qsr_ice(:,:,1) = sf(jp_qsr)%fnow(:,:,1)
198	tatm_ice(:,:) = sf(jp_tair)%fnow(:,:,1)
199	qatm_ice(:,:) = sf(jp_humi)%fnow(:,:,1)
200	tprecip(:,:) = sf(jp_prec)%fnow(:,:,1) * rn_pfac
201	sprecip(:,:) = sf(jp_snow)%fnow(:,:,1) * rn_pfac
202	wndi_ice(:,:) = sf(jp_wndi)%fnow(:,:,1)
203	wndj_ice(:,:) = sf(jp_wndj)%fnow(:,:,1)
204	ENDIF
205	#endif
206	!
207	END SUBROUTINE sbc_blk_core
208
209
210	SUBROUTINE blk_oce_core( kt, sf, pst, pu, pv )
211	!!---------------------------------------------------------------------
212	!! * ROUTINE blk_core *
213	!!
214	!! ** Purpose : provide the momentum, heat and freshwater fluxes at
215	!! the ocean surface at each time step
216	!!
217	!! ** Method : CORE bulk formulea for the ocean using atmospheric
218	!! fields read in sbc_read
219	!!
220	!! ** Outputs : - utau : i-component of the stress at U-point (N/m2)
221	!! - vtau : j-component of the stress at V-point (N/m2)
222	!! - taum : Wind stress module at T-point (N/m2)
223	!! - wndm : Wind speed module at T-point (m/s)
224	!! - qsr : Solar heat flux over the ocean (W/m2)
225	!! - qns : Non Solar heat flux over the ocean (W/m2)
226	!! - evap : Evaporation over the ocean (kg/m2/s)
227	!! - emp : evaporation minus precipitation (kg/m2/s)
228	!!
229	!! ** Nota : sf has to be a dummy argument for AGRIF on NEC
230	!!---------------------------------------------------------------------
231	INTEGER , INTENT(in ) :: kt ! time step index
232	TYPE(fld), INTENT(inout), DIMENSION(:) :: sf ! input data
233	REAL(wp) , INTENT(in) , DIMENSION(:,:) :: pst ! surface temperature [Celcius]
234	REAL(wp) , INTENT(in) , DIMENSION(:,:) :: pu ! surface current at U-point (i-component) [m/s]
235	REAL(wp) , INTENT(in) , DIMENSION(:,:) :: pv ! surface current at V-point (j-component) [m/s]
236	!
237	INTEGER :: ji, jj ! dummy loop indices
238	REAL(wp) :: zcoef_qsatw, zztmp ! local variable
239	REAL(wp), DIMENSION(:,:), POINTER :: zwnd_i, zwnd_j ! wind speed components at T-point
240	REAL(wp), DIMENSION(:,:), POINTER :: zqsatw ! specific humidity at pst
241	REAL(wp), DIMENSION(:,:), POINTER :: zqlw, zqsb ! long wave and sensible heat fluxes
242	REAL(wp), DIMENSION(:,:), POINTER :: zqla, zevap ! latent heat fluxes and evaporation
243	REAL(wp), DIMENSION(:,:), POINTER :: Cd ! transfer coefficient for momentum (tau)
244	REAL(wp), DIMENSION(:,:), POINTER :: Ch ! transfer coefficient for sensible heat (Q_sens)
245	REAL(wp), DIMENSION(:,:), POINTER :: Ce ! tansfert coefficient for evaporation (Q_lat)
246	REAL(wp), DIMENSION(:,:), POINTER :: zst ! surface temperature in Kelvin
247	REAL(wp), DIMENSION(:,:), POINTER :: zt_zu ! air temperature at wind speed height
248	REAL(wp), DIMENSION(:,:), POINTER :: zq_zu ! air spec. hum. at wind speed height
249	!!---------------------------------------------------------------------
250	!
251	IF( nn_timing == 1 ) CALL timing_start('blk_oce_core')
252	!
253	CALL wrk_alloc( jpi,jpj, zwnd_i, zwnd_j, zqsatw, zqlw, zqsb, zqla, zevap )
254	CALL wrk_alloc( jpi,jpj, Cd, Ch, Ce, zst, zt_zu, zq_zu )
255	!
256	! local scalars ( place there for vector optimisation purposes)
257	zcoef_qsatw = 0.98 * 640380. / rhoa
258
259	zst(:,:) = pst(:,:) + rt0 ! convert SST from Celcius to Kelvin (and set minimum value far above 0 K)
260
261	! ----------------------------------------------------------------------------- !
262	! 0 Wind components and module at T-point relative to the moving ocean !
263	! ----------------------------------------------------------------------------- !
264
265	! ... components ( U10m - U_oce ) at T-point (unmasked)
266	zwnd_i(:,:) = 0.e0
267	zwnd_j(:,:) = 0.e0
268	#if defined key_cyclone
269	# if defined key_vectopt_loop
270	!CDIR COLLAPSE
271	# endif
272	CALL wnd_cyc( kt, zwnd_i, zwnd_j ) ! add Manu !
273	DO jj = 2, jpjm1
274	DO ji = fs_2, fs_jpim1 ! vect. opt.
275	sf(jp_wndi)%fnow(ji,jj,1) = sf(jp_wndi)%fnow(ji,jj,1) + zwnd_i(ji,jj)
276	sf(jp_wndj)%fnow(ji,jj,1) = sf(jp_wndj)%fnow(ji,jj,1) + zwnd_j(ji,jj)
277	END DO
278	END DO
279	#endif
280	#if defined key_vectopt_loop
281	!CDIR COLLAPSE
282	#endif
283	DO jj = 2, jpjm1
284	DO ji = fs_2, fs_jpim1 ! vect. opt.
285	zwnd_i(ji,jj) = ( sf(jp_wndi)%fnow(ji,jj,1) - rn_vfac * 0.5 * ( pu(ji-1,jj ) + pu(ji,jj) ) )
286	zwnd_j(ji,jj) = ( sf(jp_wndj)%fnow(ji,jj,1) - rn_vfac * 0.5 * ( pv(ji ,jj-1) + pv(ji,jj) ) )
287	END DO
288	END DO
289	CALL lbc_lnk( zwnd_i(:,:) , 'T', -1. )
290	CALL lbc_lnk( zwnd_j(:,:) , 'T', -1. )
291	! ... scalar wind ( = \| U10m - U_oce \| ) at T-point (masked)
292	!CDIR NOVERRCHK
293	!CDIR COLLAPSE
294	wndm(:,:) = SQRT( zwnd_i(:,:) * zwnd_i(:,:) &
295	& + zwnd_j(:,:) * zwnd_j(:,:) ) * tmask(:,:,1)
296
297	! ----------------------------------------------------------------------------- !
298	! I Radiative FLUXES !
299	! ----------------------------------------------------------------------------- !
300
301	! ocean albedo assumed to be constant + modify now Qsr to include the diurnal cycle ! Short Wave
302	zztmp = 1. - albo
303	IF( ln_dm2dc ) THEN ; qsr(:,:) = zztmp * sbc_dcy( sf(jp_qsr)%fnow(:,:,1) ) * tmask(:,:,1)
304	ELSE ; qsr(:,:) = zztmp * sf(jp_qsr)%fnow(:,:,1) * tmask(:,:,1)
305	ENDIF
306	!CDIR COLLAPSE
307	zqlw(:,:) = ( sf(jp_qlw)%fnow(:,:,1) - Stef * zst(:,:)zst(:,:)zst(:,:)zst(:,:) ) tmask(:,:,1) ! Long Wave
308	! ----------------------------------------------------------------------------- !
309	! II Turbulent FLUXES !
310	! ----------------------------------------------------------------------------- !
311
312	! ... specific humidity at SST and IST
313	!CDIR NOVERRCHK
314	!CDIR COLLAPSE
315	zqsatw(:,:) = zcoef_qsatw * EXP( -5107.4 / zst(:,:) )
316
317	! ... NCAR Bulk formulae, computation of Cd, Ch, Ce at T-point :
318	IF( ln_2m ) THEN
319	!! If air temp. and spec. hum. are given at different height (2m) than wind (10m) :
320	CALL TURB_CORE_2Z(2.,10., zst , sf(jp_tair)%fnow, &
321	& zqsatw, sf(jp_humi)%fnow, wndm, &
322	& Cd , Ch , Ce , &
323	& zt_zu , zq_zu )
324	ELSE IF( ln_bulk2z ) THEN
325	!! If the height of the air temp./spec. hum. and wind are to be specified by hand :
326	IF( rn_zqt == rn_zu ) THEN
327	!! If air temp. and spec. hum. are at the same height as wind :
328	CALL TURB_CORE_1Z( rn_zu, zst , sf(jp_tair)%fnow(:,:,1), &
329	& zqsatw, sf(jp_humi)%fnow(:,:,1), wndm, &
330	& Cd , Ch , Ce )
331	ELSE
332	!! If air temp. and spec. hum. are at a different height to wind :
333	CALL TURB_CORE_2Z(rn_zqt, rn_zu , zst , sf(jp_tair)%fnow, &
334	& zqsatw, sf(jp_humi)%fnow, wndm, &
335	& Cd , Ch , Ce , &
336	& zt_zu , zq_zu )
337	ENDIF
338	ELSE
339	!! If air temp. and spec. hum. are given at same height than wind (10m) :
340	!gm bug? at the compiling phase, add a copy in temporary arrays... ==> check perf
341	! CALL TURB_CORE_1Z( 10., zst (:,:), sf(jp_tair)%fnow(:,:), &
342	! & zqsatw(:,:), sf(jp_humi)%fnow(:,:), wndm(:,:), &
343	! & Cd (:,:), Ch (:,:), Ce (:,:) )
344	!gm bug
345	! ARPDBG - this won't compile with gfortran. Fix but check performance
346	! as per comment above.
347	CALL TURB_CORE_1Z( 10., zst , sf(jp_tair)%fnow(:,:,1), &
348	& zqsatw, sf(jp_humi)%fnow(:,:,1), wndm, &
349	& Cd , Ch , Ce )
350	ENDIF
351
352	! ... tau module, i and j component
353	DO jj = 1, jpj
354	DO ji = 1, jpi
355	zztmp = rhoa * wndm(ji,jj) * Cd(ji,jj)
356	taum (ji,jj) = zztmp * wndm (ji,jj)
357	zwnd_i(ji,jj) = zztmp * zwnd_i(ji,jj)
358	zwnd_j(ji,jj) = zztmp * zwnd_j(ji,jj)
359	END DO
360	END DO
361
362	! ... add the HF tau contribution to the wind stress module?
363	IF( lhftau ) THEN
364	!CDIR COLLAPSE
365	taum(:,:) = taum(:,:) + sf(jp_tdif)%fnow(:,:,1)
366	ENDIF
367	CALL iom_put( "taum_oce", taum ) ! output wind stress module
368
369	! ... utau, vtau at U- and V_points, resp.
370	! Note the use of 0.5*(2-umask) in order to unmask the stress along coastlines
371	DO jj = 1, jpjm1
372	DO ji = 1, fs_jpim1
373	utau(ji,jj) = 0.5 * ( 2. - umask(ji,jj,1) ) * ( zwnd_i(ji,jj) + zwnd_i(ji+1,jj ) )
374	vtau(ji,jj) = 0.5 * ( 2. - vmask(ji,jj,1) ) * ( zwnd_j(ji,jj) + zwnd_j(ji ,jj+1) )
375	END DO
376	END DO
377	CALL lbc_lnk( utau(:,:), 'U', -1. )
378	CALL lbc_lnk( vtau(:,:), 'V', -1. )
379
380	! Turbulent fluxes over ocean
381	! -----------------------------
382	IF( ln_2m .OR. ( ln_bulk2z .AND. rn_zqt /= rn_zu ) ) THEN
383	! Values of temp. and hum. adjusted to height of wind must be used
384	zevap(:,:) = rn_efac * MAX( 0.e0, rhoa Ce(:,:)( zqsatw(:,:) - zq_zu(:,:) ) * wndm(:,:) ) ! Evaporation
385	zqsb (:,:) = rhoacpaCh(:,:)( zst (:,:) - zt_zu(:,:) ) wndm(:,:) ! Sensible Heat
386	ELSE
387	!CDIR COLLAPSE
388	zevap(:,:) = rn_efac * MAX( 0.e0, rhoa Ce(:,:)( zqsatw(:,:) - sf(jp_humi)%fnow(:,:,1) ) * wndm(:,:) ) ! Evaporation
389	!CDIR COLLAPSE
390	zqsb (:,:) = rhoacpaCh(:,:)( zst (:,:) - sf(jp_tair)%fnow(:,:,1) ) wndm(:,:) ! Sensible Heat
391	ENDIF
392	!CDIR COLLAPSE
393	zqla (:,:) = Lv * zevap(:,:) ! Latent Heat
394
395	IF(ln_ctl) THEN
396	CALL prt_ctl( tab2d_1=zqla , clinfo1=' blk_oce_core: zqla : ', tab2d_2=Ce , clinfo2=' Ce : ' )
397	CALL prt_ctl( tab2d_1=zqsb , clinfo1=' blk_oce_core: zqsb : ', tab2d_2=Ch , clinfo2=' Ch : ' )
398	CALL prt_ctl( tab2d_1=zqlw , clinfo1=' blk_oce_core: zqlw : ', tab2d_2=qsr, clinfo2=' qsr : ' )
399	CALL prt_ctl( tab2d_1=zqsatw, clinfo1=' blk_oce_core: zqsatw : ', tab2d_2=zst, clinfo2=' zst : ' )
400	CALL prt_ctl( tab2d_1=utau , clinfo1=' blk_oce_core: utau : ', mask1=umask, &
401	& tab2d_2=vtau , clinfo2= ' vtau : ' , mask2=vmask )
402	CALL prt_ctl( tab2d_1=wndm , clinfo1=' blk_oce_core: wndm : ')
403	CALL prt_ctl( tab2d_1=zst , clinfo1=' blk_oce_core: zst : ')
404	ENDIF
405
406	! ----------------------------------------------------------------------------- !
407	! III Total FLUXES !
408	! ----------------------------------------------------------------------------- !
409
410	!CDIR COLLAPSE
411	emp (:,:) = ( zevap(:,:) & ! mass flux (evap. - precip.)
412	& - sf(jp_prec)%fnow(:,:,1) * rn_pfac ) * tmask(:,:,1)
413	!CDIR COLLAPSE
414	qns(:,:) = zqlw(:,:) - zqsb(:,:) - zqla(:,:) & ! Downward Non Solar flux
415	& - sf(jp_snow)%fnow(:,:,1) * rn_pfac * lfus & ! remove latent melting heat for solid precip
416	& - zevap(:,:) * pst(:,:) * rcp & ! remove evap heat content at SST
417	& + ( sf(jp_prec)%fnow(:,:,1) - sf(jp_snow)%fnow(:,:,1) ) * rn_pfac & ! add liquid precip heat content at Tair
418	& * ( sf(jp_tair)%fnow(:,:,1) - rt0 ) * rcp &
419	& + sf(jp_snow)%fnow(:,:,1) * rn_pfac & ! add solid precip heat content at min(Tair,Tsnow)
420	& * ( MIN( sf(jp_tair)%fnow(:,:,1), rt0_snow ) - rt0 ) * cpic
421	!
422	CALL iom_put( "qlw_oce", zqlw ) ! output downward longwave heat over the ocean
423	CALL iom_put( "qsb_oce", - zqsb ) ! output downward sensible heat over the ocean
424	CALL iom_put( "qla_oce", - zqla ) ! output downward latent heat over the ocean
425	CALL iom_put( "qhc_oce", qns-zqlw+zqsb+zqla ) ! output downward heat content of E-P over the ocean
426	CALL iom_put( "qns_oce", qns ) ! output downward non solar heat over the ocean
427	!
428	IF(ln_ctl) THEN
429	CALL prt_ctl(tab2d_1=zqsb , clinfo1=' blk_oce_core: zqsb : ', tab2d_2=zqlw , clinfo2=' zqlw : ')
430	CALL prt_ctl(tab2d_1=zqla , clinfo1=' blk_oce_core: zqla : ', tab2d_2=qsr , clinfo2=' qsr : ')
431	CALL prt_ctl(tab2d_1=pst , clinfo1=' blk_oce_core: pst : ', tab2d_2=emp , clinfo2=' emp : ')
432	CALL prt_ctl(tab2d_1=utau , clinfo1=' blk_oce_core: utau : ', mask1=umask, &
433	& tab2d_2=vtau , clinfo2= ' vtau : ' , mask2=vmask )
434	ENDIF
435	!
436	CALL wrk_dealloc( jpi,jpj, zwnd_i, zwnd_j, zqsatw, zqlw, zqsb, zqla, zevap )
437	CALL wrk_dealloc( jpi,jpj, Cd, Ch, Ce, zst, zt_zu, zq_zu )
438	!
439	IF( nn_timing == 1 ) CALL timing_stop('blk_oce_core')
440	!
441	END SUBROUTINE blk_oce_core
442
443	SUBROUTINE blk_bio_meanqsr
444	!!---------------------------------------------------------------------
445	!! *** ROUTINE blk_bio_meanqsr
446	!!
447	!! ** Purpose : provide daily qsr_mean for PISCES when
448	!! analytic diurnal cycle is applied in physic
449	!!
450	!! ** Method : add part where there is no ice
451	!!
452	!!---------------------------------------------------------------------
453	IF( nn_timing == 1 ) CALL timing_start('blk_bio_meanqsr')
454
455	qsr_mean(:,:) = (1. - albo ) * sf(jp_qsr)%fnow(:,:,1)
456
457	IF( nn_timing == 1 ) CALL timing_stop('blk_bio_meanqsr')
458
459	END SUBROUTINE blk_bio_meanqsr
460
461
462	SUBROUTINE blk_ice_meanqsr(palb,p_qsr_mean,pdim)
463	!!---------------------------------------------------------------------
464	!!
465	!! ** Purpose : provide the daily qsr_mean over sea_ice for PISCES when
466	!! analytic diurnal cycle is applied in physic
467	!!
468	!! ** Method : compute qsr
469	!!
470	!!---------------------------------------------------------------------
471	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: palb ! ice albedo (clear sky) (alb_ice_cs) [%]
472	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qsr_mean ! solar heat flux over ice (T-point) [W/m2]
473	INTEGER , INTENT(in ) :: pdim ! number of ice categories
474	!!
475	INTEGER :: ijpl ! number of ice categories (size of 3rd dim of input arrays)
476	INTEGER :: ji, jj, jl ! dummy loop indices
477	REAL(wp) :: zztmp ! temporary variable
478	!!---------------------------------------------------------------------
479	IF( nn_timing == 1 ) CALL timing_start('blk_ice_meanqsr')
480	!
481	ijpl = pdim ! number of ice categories
482	zztmp = 1. / ( 1. - albo )
483	! ! ========================== !
484	DO jl = 1, ijpl ! Loop over ice categories !
485	! ! ========================== !
486	DO jj = 1 , jpj
487	DO ji = 1, jpi
488	p_qsr_mean(ji,jj,jl) = zztmp * ( 1. - palb(ji,jj,jl) ) * qsr_mean(ji,jj)
489	END DO
490	END DO
491	END DO
492	!
493	IF( nn_timing == 1 ) CALL timing_stop('blk_ice_meanqsr')
494	!
495	END SUBROUTINE blk_ice_meanqsr
496
497
498	SUBROUTINE blk_ice_core( pst , pui , pvi , palb , &
499	& p_taui, p_tauj, p_qns , p_qsr, &
500	& p_qla , p_dqns, p_dqla, &
501	& p_tpr , p_spr , &
502	& p_fr1 , p_fr2 , cd_grid, pdim )
503	!!---------------------------------------------------------------------
504	!! * ROUTINE blk_ice_core *
505	!!
506	!! ** Purpose : provide the surface boundary condition over sea-ice
507	!!
508	!! ** Method : compute momentum, heat and freshwater exchanged
509	!! between atmosphere and sea-ice using CORE bulk
510	!! formulea, ice variables and read atmmospheric fields.
511	!! NB: ice drag coefficient is assumed to be a constant
512	!!
513	!! caution : the net upward water flux has with mm/day unit
514	!!---------------------------------------------------------------------
515	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: pst ! ice surface temperature (>0, =rt0 over land) [Kelvin]
516	REAL(wp), DIMENSION(:,:) , INTENT(in ) :: pui ! ice surface velocity (i- and i- components [m/s]
517	REAL(wp), DIMENSION(:,:) , INTENT(in ) :: pvi ! at I-point (B-grid) or U & V-point (C-grid)
518	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: palb ! ice albedo (all skies) [%]
519	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_taui ! i- & j-components of surface ice stress [N/m2]
520	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_tauj ! at I-point (B-grid) or U & V-point (C-grid)
521	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qns ! non solar heat flux over ice (T-point) [W/m2]
522	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qsr ! solar heat flux over ice (T-point) [W/m2]
523	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qla ! latent heat flux over ice (T-point) [W/m2]
524	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_dqns ! non solar heat sensistivity (T-point) [W/m2]
525	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_dqla ! latent heat sensistivity (T-point) [W/m2]
526	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_tpr ! total precipitation (T-point) [Kg/m2/s]
527	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_spr ! solid precipitation (T-point) [Kg/m2/s]
528	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_fr1 ! 1sr fraction of qsr penetration in ice (T-point) [%]
529	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_fr2 ! 2nd fraction of qsr penetration in ice (T-point) [%]
530	CHARACTER(len=1) , INTENT(in ) :: cd_grid ! ice grid ( C or B-grid)
531	INTEGER , INTENT(in ) :: pdim ! number of ice categories
532	!!
533	INTEGER :: ji, jj, jl ! dummy loop indices
534	INTEGER :: ijpl ! number of ice categories (size of 3rd dim of input arrays)
535	REAL(wp) :: zst2, zst3
536	REAL(wp) :: zcoef_wnorm, zcoef_wnorm2, zcoef_dqlw, zcoef_dqla, zcoef_dqsb
537	REAL(wp) :: zztmp ! temporary variable
538	REAL(wp) :: zwnorm_f, zwndi_f , zwndj_f ! relative wind module and components at F-point
539	REAL(wp) :: zwndi_t , zwndj_t ! relative wind components at T-point
540	!!
541	REAL(wp), DIMENSION(:,:) , POINTER :: z_wnds_t ! wind speed ( = \| U10m - U_ice \| ) at T-point
542	REAL(wp), DIMENSION(:,:,:), POINTER :: z_qlw ! long wave heat flux over ice
543	REAL(wp), DIMENSION(:,:,:), POINTER :: z_qsb ! sensible heat flux over ice
544	REAL(wp), DIMENSION(:,:,:), POINTER :: z_dqlw ! long wave heat sensitivity over ice
545	REAL(wp), DIMENSION(:,:,:), POINTER :: z_dqsb ! sensible heat sensitivity over ice
546	!!---------------------------------------------------------------------
547	!
548	IF( nn_timing == 1 ) CALL timing_start('blk_ice_core')
549	!
550	CALL wrk_alloc( jpi,jpj, z_wnds_t )
551	CALL wrk_alloc( jpi,jpj,pdim, z_qlw, z_qsb, z_dqlw, z_dqsb )
552
553	ijpl = pdim ! number of ice categories
554
555	! local scalars ( place there for vector optimisation purposes)
556	zcoef_wnorm = rhoa * Cice
557	zcoef_wnorm2 = rhoa * Cice * 0.5
558	zcoef_dqlw = 4.0 * 0.95 * Stef
559	zcoef_dqla = -Ls * Cice * 11637800. * (-5897.8)
560	zcoef_dqsb = rhoa * cpa * Cice
561
562	!!gm brutal....
563	z_wnds_t(:,:) = 0.e0
564	p_taui (:,:) = 0.e0
565	p_tauj (:,:) = 0.e0
566	!!gm end
567
568	#if defined key_lim3
569	tatm_ice(:,:) = sf(jp_tair)%fnow(:,:,1) ! LIM3: make Tair available in sea-ice. WARNING allocated after call to ice_init
570	#endif
571	! ----------------------------------------------------------------------------- !
572	! Wind components and module relative to the moving ocean ( U10m - U_ice ) !
573	! ----------------------------------------------------------------------------- !
574	SELECT CASE( cd_grid )
575	CASE( 'I' ) ! B-grid ice dynamics : I-point (i.e. F-point with sea-ice indexation)
576	! and scalar wind at T-point ( = \| U10m - U_ice \| ) (masked)
577	!CDIR NOVERRCHK
578	DO jj = 2, jpjm1
579	DO ji = 2, jpim1 ! B grid : NO vector opt
580	! ... scalar wind at I-point (fld being at T-point)
581	zwndi_f = 0.25 * ( sf(jp_wndi)%fnow(ji-1,jj ,1) + sf(jp_wndi)%fnow(ji ,jj ,1) &
582	& + sf(jp_wndi)%fnow(ji-1,jj-1,1) + sf(jp_wndi)%fnow(ji ,jj-1,1) ) - rn_vfac * pui(ji,jj)
583	zwndj_f = 0.25 * ( sf(jp_wndj)%fnow(ji-1,jj ,1) + sf(jp_wndj)%fnow(ji ,jj ,1) &
584	& + sf(jp_wndj)%fnow(ji-1,jj-1,1) + sf(jp_wndj)%fnow(ji ,jj-1,1) ) - rn_vfac * pvi(ji,jj)
585	zwnorm_f = zcoef_wnorm * SQRT( zwndi_f * zwndi_f + zwndj_f * zwndj_f )
586	! ... ice stress at I-point
587	p_taui(ji,jj) = zwnorm_f * zwndi_f
588	p_tauj(ji,jj) = zwnorm_f * zwndj_f
589	! ... scalar wind at T-point (fld being at T-point)
590	zwndi_t = sf(jp_wndi)%fnow(ji,jj,1) - rn_vfac * 0.25 * ( pui(ji,jj+1) + pui(ji+1,jj+1) &
591	& + pui(ji,jj ) + pui(ji+1,jj ) )
592	zwndj_t = sf(jp_wndj)%fnow(ji,jj,1) - rn_vfac * 0.25 * ( pvi(ji,jj+1) + pvi(ji+1,jj+1) &
593	& + pvi(ji,jj ) + pvi(ji+1,jj ) )
594	z_wnds_t(ji,jj) = SQRT( zwndi_t * zwndi_t + zwndj_t * zwndj_t ) * tmask(ji,jj,1)
595	END DO
596	END DO
597	CALL lbc_lnk( p_taui , 'I', -1. )
598	CALL lbc_lnk( p_tauj , 'I', -1. )
599	CALL lbc_lnk( z_wnds_t, 'T', 1. )
600	!
601	CASE( 'C' ) ! C-grid ice dynamics : U & V-points (same as ocean)
602	#if defined key_vectopt_loop
603	!CDIR COLLAPSE
604	#endif
605	DO jj = 2, jpj
606	DO ji = fs_2, jpi ! vect. opt.
607	zwndi_t = ( sf(jp_wndi)%fnow(ji,jj,1) - rn_vfac * 0.5 * ( pui(ji-1,jj ) + pui(ji,jj) ) )
608	zwndj_t = ( sf(jp_wndj)%fnow(ji,jj,1) - rn_vfac * 0.5 * ( pvi(ji ,jj-1) + pvi(ji,jj) ) )
609	z_wnds_t(ji,jj) = SQRT( zwndi_t * zwndi_t + zwndj_t * zwndj_t ) * tmask(ji,jj,1)
610	END DO
611	END DO
612	#if defined key_vectopt_loop
613	!CDIR COLLAPSE
614	#endif
615	DO jj = 2, jpjm1
616	DO ji = fs_2, fs_jpim1 ! vect. opt.
617	p_taui(ji,jj) = zcoef_wnorm2 * ( z_wnds_t(ji+1,jj ) + z_wnds_t(ji,jj) ) &
618	& * ( 0.5 * (sf(jp_wndi)%fnow(ji+1,jj,1) + sf(jp_wndi)%fnow(ji,jj,1) ) - rn_vfac * pui(ji,jj) )
619	p_tauj(ji,jj) = zcoef_wnorm2 * ( z_wnds_t(ji,jj+1 ) + z_wnds_t(ji,jj) ) &
620	& * ( 0.5 * (sf(jp_wndj)%fnow(ji,jj+1,1) + sf(jp_wndj)%fnow(ji,jj,1) ) - rn_vfac * pvi(ji,jj) )
621	END DO
622	END DO
623	CALL lbc_lnk( p_taui , 'U', -1. )
624	CALL lbc_lnk( p_tauj , 'V', -1. )
625	CALL lbc_lnk( z_wnds_t, 'T', 1. )
626	!
627	END SELECT
628
629	zztmp = 1. / ( 1. - albo )
630	! ! ========================== !
631	DO jl = 1, ijpl ! Loop over ice categories !
632	! ! ========================== !
633	!CDIR NOVERRCHK
634	!CDIR COLLAPSE
635	DO jj = 1 , jpj
636	!CDIR NOVERRCHK
637	DO ji = 1, jpi
638	! ----------------------------!
639	! I Radiative FLUXES !
640	! ----------------------------!
641	zst2 = pst(ji,jj,jl) * pst(ji,jj,jl)
642	zst3 = pst(ji,jj,jl) * zst2
643	! Short Wave (sw)
644	p_qsr(ji,jj,jl) = zztmp * ( 1. - palb(ji,jj,jl) ) * qsr(ji,jj)
645	! Long Wave (lw)
646	z_qlw(ji,jj,jl) = 0.95 * ( sf(jp_qlw)%fnow(ji,jj,1) - Stef * pst(ji,jj,jl) * zst3 ) * tmask(ji,jj,1)
647	! lw sensitivity
648	z_dqlw(ji,jj,jl) = zcoef_dqlw * zst3
649
650	! ----------------------------!
651	! II Turbulent FLUXES !
652	! ----------------------------!
653
654	! ... turbulent heat fluxes
655	! Sensible Heat
656	z_qsb(ji,jj,jl) = rhoa * cpa * Cice * z_wnds_t(ji,jj) * ( pst(ji,jj,jl) - sf(jp_tair)%fnow(ji,jj,1) )
657	! Latent Heat
658	p_qla(ji,jj,jl) = rn_efac * MAX( 0.e0, rhoa * Ls * Cice * z_wnds_t(ji,jj) &
659	& * ( 11637800. * EXP( -5897.8 / pst(ji,jj,jl) ) / rhoa - sf(jp_humi)%fnow(ji,jj,1) ) )
660	! Latent heat sensitivity for ice (Dqla/Dt)
661	! MV we also have to cap the sensitivity if the flux is zero
662	IF ( p_qla(ji,jj,jl) .GT. 0.0 ) THEN
663	p_dqla(ji,jj,jl) = rn_efac * zcoef_dqla * z_wnds_t(ji,jj) / ( zst2 ) * EXP( -5897.8 / pst(ji,jj,jl) )
664	ELSE
665	p_dqla(ji,jj,jl) = 0.0
666	ENDIF
667
668	! Sensible heat sensitivity (Dqsb_ice/Dtn_ice)
669	z_dqsb(ji,jj,jl) = zcoef_dqsb * z_wnds_t(ji,jj)
670
671	! ----------------------------!
672	! III Total FLUXES !
673	! ----------------------------!
674	! Downward Non Solar flux
675	p_qns (ji,jj,jl) = z_qlw (ji,jj,jl) - z_qsb (ji,jj,jl) - p_qla (ji,jj,jl)
676	! Total non solar heat flux sensitivity for ice
677	p_dqns(ji,jj,jl) = - ( z_dqlw(ji,jj,jl) + z_dqsb(ji,jj,jl) + p_dqla(ji,jj,jl) )
678	END DO
679	!
680	END DO
681	!
682	END DO
683	!
684	!--------------------------------------------------------------------
685	! FRACTIONs of net shortwave radiation which is not absorbed in the
686	! thin surface layer and penetrates inside the ice cover
687	! ( Maykut and Untersteiner, 1971 ; Ebert and Curry, 1993 )
688
689	!CDIR COLLAPSE
690	p_fr1(:,:) = ( 0.18 * ( 1.0 - cldf_ice ) + 0.35 * cldf_ice )
691	!CDIR COLLAPSE
692	p_fr2(:,:) = ( 0.82 * ( 1.0 - cldf_ice ) + 0.65 * cldf_ice )
693
694	!CDIR COLLAPSE
695	p_tpr(:,:) = sf(jp_prec)%fnow(:,:,1) * rn_pfac ! total precipitation [kg/m2/s]
696	!CDIR COLLAPSE
697	p_spr(:,:) = sf(jp_snow)%fnow(:,:,1) * rn_pfac ! solid precipitation [kg/m2/s]
698	CALL iom_put( 'snowpre', p_spr * 86400. ) ! Snow precipitation
699	CALL iom_put( 'precip', p_tpr * 86400. ) ! Total precipitation
700	!
701	IF(ln_ctl) THEN
702	CALL prt_ctl(tab3d_1=p_qla , clinfo1=' blk_ice_core: p_qla : ', tab3d_2=z_qsb , clinfo2=' z_qsb : ', kdim=ijpl)
703	CALL prt_ctl(tab3d_1=z_qlw , clinfo1=' blk_ice_core: z_qlw : ', tab3d_2=p_dqla , clinfo2=' p_dqla : ', kdim=ijpl)
704	CALL prt_ctl(tab3d_1=z_dqsb , clinfo1=' blk_ice_core: z_dqsb : ', tab3d_2=z_dqlw , clinfo2=' z_dqlw : ', kdim=ijpl)
705	CALL prt_ctl(tab3d_1=p_dqns , clinfo1=' blk_ice_core: p_dqns : ', tab3d_2=p_qsr , clinfo2=' p_qsr : ', kdim=ijpl)
706	CALL prt_ctl(tab3d_1=pst , clinfo1=' blk_ice_core: pst : ', tab3d_2=p_qns , clinfo2=' p_qns : ', kdim=ijpl)
707	CALL prt_ctl(tab2d_1=p_tpr , clinfo1=' blk_ice_core: p_tpr : ', tab2d_2=p_spr , clinfo2=' p_spr : ')
708	CALL prt_ctl(tab2d_1=p_taui , clinfo1=' blk_ice_core: p_taui : ', tab2d_2=p_tauj , clinfo2=' p_tauj : ')
709	CALL prt_ctl(tab2d_1=z_wnds_t, clinfo1=' blk_ice_core: z_wnds_t : ')
710	ENDIF
711
712	CALL wrk_dealloc( jpi,jpj, z_wnds_t )
713	CALL wrk_dealloc( jpi,jpj,pdim, z_qlw, z_qsb, z_dqlw, z_dqsb )
714	!
715	IF( nn_timing == 1 ) CALL timing_stop('blk_ice_core')
716	!
717	END SUBROUTINE blk_ice_core
718
719
720	SUBROUTINE TURB_CORE_1Z(zu, sst, T_a, q_sat, q_a, &
721	& dU , Cd , Ch , Ce )
722	!!----------------------------------------------------------------------
723	!! * ROUTINE turb_core *
724	!!
725	!! ** Purpose : Computes turbulent transfert coefficients of surface
726	!! fluxes according to Large & Yeager (2004)
727	!!
728	!! ** 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
729	!! Momentum, Latent and sensible heat exchange coefficients
730	!! Caution: this procedure should only be used in cases when air
731	!! temperature (T_air), air specific humidity (q_air) and wind (dU)
732	!! are provided at the same height 'zzu'!
733	!!
734	!! References : Large & Yeager, 2004 : ???
735	!!----------------------------------------------------------------------
736	REAL(wp) , INTENT(in ) :: zu ! altitude of wind measurement [m]
737	REAL(wp), DIMENSION(:,:), INTENT(in ) :: sst ! sea surface temperature [Kelvin]
738	REAL(wp), DIMENSION(:,:), INTENT(in ) :: T_a ! potential air temperature [Kelvin]
739	REAL(wp), DIMENSION(:,:), INTENT(in ) :: q_sat ! sea surface specific humidity [kg/kg]
740	REAL(wp), DIMENSION(:,:), INTENT(in ) :: q_a ! specific air humidity [kg/kg]
741	REAL(wp), DIMENSION(:,:), INTENT(in ) :: dU ! wind module \|U(zu)-U(0)\| [m/s]
742	REAL(wp), DIMENSION(:,:), INTENT( out) :: Cd ! transfert coefficient for momentum (tau)
743	REAL(wp), DIMENSION(:,:), INTENT( out) :: Ch ! transfert coefficient for temperature (Q_sens)
744	REAL(wp), DIMENSION(:,:), INTENT( out) :: Ce ! transfert coefficient for evaporation (Q_lat)
745	!!
746	INTEGER :: j_itt
747	INTEGER , PARAMETER :: nb_itt = 3
748	REAL(wp), PARAMETER :: grav = 9.8 ! gravity
749	REAL(wp), PARAMETER :: kappa = 0.4 ! von Karman s constant
750
751	REAL(wp), DIMENSION(:,:), POINTER :: dU10 ! dU [m/s]
752	REAL(wp), DIMENSION(:,:), POINTER :: dT ! air/sea temperature differeence [K]
753	REAL(wp), DIMENSION(:,:), POINTER :: dq ! air/sea humidity difference [K]
754	REAL(wp), DIMENSION(:,:), POINTER :: Cd_n10 ! 10m neutral drag coefficient
755	REAL(wp), DIMENSION(:,:), POINTER :: Ce_n10 ! 10m neutral latent coefficient
756	REAL(wp), DIMENSION(:,:), POINTER :: Ch_n10 ! 10m neutral sensible coefficient
757	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd_n10 ! root square of Cd_n10
758	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd ! root square of Cd
759	REAL(wp), DIMENSION(:,:), POINTER :: T_vpot ! virtual potential temperature [K]
760	REAL(wp), DIMENSION(:,:), POINTER :: T_star ! turbulent scale of tem. fluct.
761	REAL(wp), DIMENSION(:,:), POINTER :: q_star ! turbulent humidity of temp. fluct.
762	REAL(wp), DIMENSION(:,:), POINTER :: U_star ! turb. scale of velocity fluct.
763	REAL(wp), DIMENSION(:,:), POINTER :: L ! Monin-Obukov length [m]
764	REAL(wp), DIMENSION(:,:), POINTER :: zeta ! stability parameter at height zu
765	REAL(wp), DIMENSION(:,:), POINTER :: U_n10 ! neutral wind velocity at 10m [m]
766	REAL(wp), DIMENSION(:,:), POINTER :: xlogt, xct, zpsi_h, zpsi_m
767
768	INTEGER , DIMENSION(:,:), POINTER :: stab ! 1st guess stability test integer
769	!!----------------------------------------------------------------------
770	!
771	IF( nn_timing == 1 ) CALL timing_start('TURB_CORE_1Z')
772	!
773	CALL wrk_alloc( jpi,jpj, stab ) ! integer
774	CALL wrk_alloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
775	CALL wrk_alloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta, U_n10, xlogt, xct, zpsi_h, zpsi_m )
776
777	!! * Start
778	!! Air/sea differences
779	dU10 = max(0.5, dU) ! we don't want to fall under 0.5 m/s
780	dT = T_a - sst ! assuming that T_a is allready the potential temp. at zzu
781	dq = q_a - q_sat
782	!!
783	!! Virtual potential temperature
784	T_vpot = T_a(1. + 0.608q_a)
785	!!
786	!! Neutral Drag Coefficient
787	stab = 0.5 + sign(0.5,dT) ! stable : stab = 1 ; unstable : stab = 0
788	IF ( ln_cdgw ) THEN
789	cdn_wave = cdn_wave - rsmall*(tmask(:,:,1)-1)
790	Cd_n10(:,:) = cdn_wave
791	ELSE
792	Cd_n10 = 1.e-3 * ( 2.7/dU10 + 0.142 + dU10/13.09 ) ! L & Y eq. (6a)
793	ENDIF
794	sqrt_Cd_n10 = sqrt(Cd_n10)
795	Ce_n10 = 1.e-3 * ( 34.6 * sqrt_Cd_n10 ) ! L & Y eq. (6b)
796	Ch_n10 = 1.e-3sqrt_Cd_n10(18.stab + 32.7(1.-stab)) ! L & Y eq. (6c), (6d)
797	!!
798	!! Initializing transfert coefficients with their first guess neutral equivalents :
799	Cd = Cd_n10 ; Ce = Ce_n10 ; Ch = Ch_n10 ; sqrt_Cd = sqrt(Cd)
800
801	!! * Now starting iteration loop
802	DO j_itt=1, nb_itt
803	!! Turbulent scales :
804	U_star = sqrt_Cd*dU10 ! L & Y eq. (7a)
805	T_star = Ch/sqrt_Cd*dT ! L & Y eq. (7b)
806	q_star = Ce/sqrt_Cd*dq ! L & Y eq. (7c)
807
808	!! Estimate the Monin-Obukov length :
809	L = (U_star*2)/( kappagrav*(T_star/T_vpot + q_star/(q_a + 1./0.608)) )
810
811	!! Stability parameters :
812	zeta = zu/L ; zeta = sign( min(abs(zeta),10.0), zeta )
813	zpsi_h = psi_h(zeta)
814	zpsi_m = psi_m(zeta)
815
816	IF ( ln_cdgw ) THEN
817	sqrt_Cd=kappa/((kappa/sqrt_Cd_n10) - zpsi_m) ; Cd=sqrt_Cd*sqrt_Cd;
818	ELSE
819	!! Shifting the wind speed to 10m and neutral stability : L & Y eq. (9a)
820	! In very rare low-wind conditions, the old way of estimating the
821	! neutral wind speed at 10m leads to a negative value that causes the code
822	! to crash. To prevent this a threshold of 0.25m/s is now imposed.
823	U_n10 = MAX( 0.25 , dU10/(1. + sqrt_Cd_n10/kappa*(log(zu/10.) - zpsi_m)) )
824
825	!! Updating the neutral 10m transfer coefficients :
826	Cd_n10 = 1.e-3 * (2.7/U_n10 + 0.142 + U_n10/13.09) ! L & Y eq. (6a)
827	sqrt_Cd_n10 = sqrt(Cd_n10)
828	Ce_n10 = 1.e-3 * (34.6 * sqrt_Cd_n10) ! L & Y eq. (6b)
829	stab = 0.5 + sign(0.5,zeta)
830	Ch_n10 = 1.e-3sqrt_Cd_n10(18.stab + 32.7(1.-stab)) ! L & Y eq. (6c), (6d)
831
832	!! Shifting the neutral 10m transfer coefficients to ( zu , zeta ) :
833	!!
834	xct = 1. + sqrt_Cd_n10/kappa*(log(zu/10) - zpsi_m)
835	Cd = Cd_n10/(xct*xct) ; sqrt_Cd = sqrt(Cd)
836	ENDIF
837	!!
838	xlogt = log(zu/10.) - zpsi_h
839	!!
840	xct = 1. + Ch_n10*xlogt/kappa/sqrt_Cd_n10
841	Ch = Ch_n10*sqrt_Cd/sqrt_Cd_n10/xct
842	!!
843	xct = 1. + Ce_n10*xlogt/kappa/sqrt_Cd_n10
844	Ce = Ce_n10*sqrt_Cd/sqrt_Cd_n10/xct
845	!!
846	END DO
847	!!
848	CALL wrk_dealloc( jpi,jpj, stab ) ! integer
849	CALL wrk_dealloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
850	CALL wrk_dealloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta, U_n10, xlogt, xct, zpsi_h, zpsi_m )
851	!
852	IF( nn_timing == 1 ) CALL timing_stop('TURB_CORE_1Z')
853	!
854	END SUBROUTINE TURB_CORE_1Z
855
856
857	SUBROUTINE TURB_CORE_2Z(zt, zu, sst, T_zt, q_sat, q_zt, dU, Cd, Ch, Ce, T_zu, q_zu)
858	!!----------------------------------------------------------------------
859	!! * ROUTINE turb_core *
860	!!
861	!! ** Purpose : Computes turbulent transfert coefficients of surface
862	!! fluxes according to Large & Yeager (2004).
863	!!
864	!! ** 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
865	!! Momentum, Latent and sensible heat exchange coefficients
866	!! Caution: this procedure should only be used in cases when air
867	!! temperature (T_air) and air specific humidity (q_air) are at a
868	!! different height to wind (dU).
869	!!
870	!! References : Large & Yeager, 2004 : ???
871	!!----------------------------------------------------------------------
872	REAL(wp), INTENT(in ) :: zt ! height for T_zt and q_zt [m]
873	REAL(wp), INTENT(in ) :: zu ! height for dU [m]
874	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: sst ! sea surface temperature [Kelvin]
875	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: T_zt ! potential air temperature [Kelvin]
876	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: q_sat ! sea surface specific humidity [kg/kg]
877	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: q_zt ! specific air humidity [kg/kg]
878	REAL(wp), INTENT(in ), DIMENSION(jpi,jpj) :: dU ! relative wind module \|U(zu)-U(0)\| [m/s]
879	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: Cd ! transfer coefficient for momentum (tau)
880	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: Ch ! transfer coefficient for sensible heat (Q_sens)
881	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: Ce ! transfert coefficient for evaporation (Q_lat)
882	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: T_zu ! air temp. shifted at zu [K]
883	REAL(wp), INTENT( out), DIMENSION(jpi,jpj) :: q_zu ! spec. hum. shifted at zu [kg/kg]
884
885	INTEGER :: j_itt
886	INTEGER , PARAMETER :: nb_itt = 5 ! number of itterations
887	REAL(wp), PARAMETER :: grav = 9.8 ! gravity
888	REAL(wp), PARAMETER :: kappa = 0.4 ! von Karman's constant
889
890	REAL(wp), DIMENSION(:,:), POINTER :: dU10 ! dU [m/s]
891	REAL(wp), DIMENSION(:,:), POINTER :: dT ! air/sea temperature differeence [K]
892	REAL(wp), DIMENSION(:,:), POINTER :: dq ! air/sea humidity difference [K]
893	REAL(wp), DIMENSION(:,:), POINTER :: Cd_n10 ! 10m neutral drag coefficient
894	REAL(wp), DIMENSION(:,:), POINTER :: Ce_n10 ! 10m neutral latent coefficient
895	REAL(wp), DIMENSION(:,:), POINTER :: Ch_n10 ! 10m neutral sensible coefficient
896	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd_n10 ! root square of Cd_n10
897	REAL(wp), DIMENSION(:,:), POINTER :: sqrt_Cd ! root square of Cd
898	REAL(wp), DIMENSION(:,:), POINTER :: T_vpot ! virtual potential temperature [K]
899	REAL(wp), DIMENSION(:,:), POINTER :: T_star ! turbulent scale of tem. fluct.
900	REAL(wp), DIMENSION(:,:), POINTER :: q_star ! turbulent humidity of temp. fluct.
901	REAL(wp), DIMENSION(:,:), POINTER :: U_star ! turb. scale of velocity fluct.
902	REAL(wp), DIMENSION(:,:), POINTER :: L ! Monin-Obukov length [m]
903	REAL(wp), DIMENSION(:,:), POINTER :: zeta_u ! stability parameter at height zu
904	REAL(wp), DIMENSION(:,:), POINTER :: zeta_t ! stability parameter at height zt
905	REAL(wp), DIMENSION(:,:), POINTER :: U_n10 ! neutral wind velocity at 10m [m]
906	REAL(wp), DIMENSION(:,:), POINTER :: xlogt, xct, zpsi_hu, zpsi_ht, zpsi_m
907
908	INTEGER , DIMENSION(:,:), POINTER :: stab ! 1st stability test integer
909	!!----------------------------------------------------------------------
910	!
911	IF( nn_timing == 1 ) CALL timing_start('TURB_CORE_2Z')
912	!
913	CALL wrk_alloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
914	CALL wrk_alloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta_u, zeta_t, U_n10 )
915	CALL wrk_alloc( jpi,jpj, xlogt, xct, zpsi_hu, zpsi_ht, zpsi_m )
916	CALL wrk_alloc( jpi,jpj, stab ) ! interger
917
918	!! Initial air/sea differences
919	dU10 = max(0.5, dU) ! we don't want to fall under 0.5 m/s
920	dT = T_zt - sst
921	dq = q_zt - q_sat
922
923	!! Neutral Drag Coefficient :
924	stab = 0.5 + sign(0.5,dT) ! stab = 1 if dT > 0 -> STABLE
925	IF( ln_cdgw ) THEN
926	cdn_wave = cdn_wave - rsmall*(tmask(:,:,1)-1)
927	Cd_n10(:,:) = cdn_wave
928	ELSE
929	Cd_n10 = 1.e-3*( 2.7/dU10 + 0.142 + dU10/13.09 )
930	ENDIF
931	sqrt_Cd_n10 = sqrt(Cd_n10)
932	Ce_n10 = 1.e-3( 34.6 sqrt_Cd_n10 )
933	Ch_n10 = 1.e-3sqrt_Cd_n10(18.stab + 32.7(1. - stab))
934
935	!! Initializing transf. coeff. with their first guess neutral equivalents :
936	Cd = Cd_n10 ; Ce = Ce_n10 ; Ch = Ch_n10 ; sqrt_Cd = sqrt(Cd)
937
938	!! Initializing z_u values with z_t values :
939	T_zu = T_zt ; q_zu = q_zt
940
941	!! * Now starting iteration loop
942	DO j_itt=1, nb_itt
943	dT = T_zu - sst ; dq = q_zu - q_sat ! Updating air/sea differences
944	T_vpot = T_zu(1. + 0.608q_zu) ! Updating virtual potential temperature at zu
945	U_star = sqrt_Cd*dU10 ! Updating turbulent scales : (L & Y eq. (7))
946	T_star = Ch/sqrt_Cd*dT !
947	q_star = Ce/sqrt_Cd*dq !
948	!!
949	L = (U_star*U_star) & ! Estimate the Monin-Obukov length at height zu
950	& / (kappagrav/T_vpot(T_star(1.+0.608q_zu) + 0.608T_zuq_star))
951	!! Stability parameters :
952	zeta_u = zu/L ; zeta_u = sign( min(abs(zeta_u),10.0), zeta_u )
953	zeta_t = zt/L ; zeta_t = sign( min(abs(zeta_t),10.0), zeta_t )
954	zpsi_hu = psi_h(zeta_u)
955	zpsi_ht = psi_h(zeta_t)
956	zpsi_m = psi_m(zeta_u)
957	!!
958	!! Shifting the wind speed to 10m and neutral stability : L & Y eq.(9a)
959	! In very rare low-wind conditions, the old way of estimating the
960	! neutral wind speed at 10m leads to a negative value that causes the code
961	! to crash. To prevent this a threshold of 0.25m/s is now imposed.
962	U_n10 = MAX( 0.25 , dU10/(1. + sqrt_Cd_n10/kappa*(log(zu/10.) - zpsi_m)) )
963	!!
964	!! Shifting temperature and humidity at zu : (L & Y eq. (9b-9c))
965	! T_zu = T_zt - T_star/kappa*(log(zt/zu) + psi_h(zeta_u) - psi_h(zeta_t))
966	T_zu = T_zt - T_star/kappa*(log(zt/zu) + zpsi_hu - zpsi_ht)
967	! q_zu = q_zt - q_star/kappa*(log(zt/zu) + psi_h(zeta_u) - psi_h(zeta_t))
968	q_zu = q_zt - q_star/kappa*(log(zt/zu) + zpsi_hu - zpsi_ht)
969	!!
970	!! q_zu cannot have a negative value : forcing 0
971	stab = 0.5 + sign(0.5,q_zu) ; q_zu = stab*q_zu
972	!!
973	IF( ln_cdgw ) THEN
974	sqrt_Cd=kappa/((kappa/sqrt_Cd_n10) - zpsi_m) ; Cd=sqrt_Cd*sqrt_Cd;
975	ELSE
976	!! Updating the neutral 10m transfer coefficients :
977	Cd_n10 = 1.e-3 * (2.7/U_n10 + 0.142 + U_n10/13.09) ! L & Y eq. (6a)
978	sqrt_Cd_n10 = sqrt(Cd_n10)
979	Ce_n10 = 1.e-3 * (34.6 * sqrt_Cd_n10) ! L & Y eq. (6b)
980	stab = 0.5 + sign(0.5,zeta_u)
981	Ch_n10 = 1.e-3sqrt_Cd_n10(18.stab + 32.7(1.-stab)) ! L & Y eq. (6c-6d)
982	!!
983	!!
984	!! Shifting the neutral 10m transfer coefficients to (zu,zeta_u) :
985	xct = 1. + sqrt_Cd_n10/kappa*(log(zu/10.) - zpsi_m) ! L & Y eq. (10a)
986	Cd = Cd_n10/(xct*xct) ; sqrt_Cd = sqrt(Cd)
987	ENDIF
988	!!
989	xlogt = log(zu/10.) - zpsi_hu
990	!!
991	xct = 1. + Ch_n10*xlogt/kappa/sqrt_Cd_n10 ! L & Y eq. (10b)
992	Ch = Ch_n10*sqrt_Cd/sqrt_Cd_n10/xct
993	!!
994	xct = 1. + Ce_n10*xlogt/kappa/sqrt_Cd_n10 ! L & Y eq. (10c)
995	Ce = Ce_n10*sqrt_Cd/sqrt_Cd_n10/xct
996	!!
997	!!
998	END DO
999	!!
1000	CALL wrk_dealloc( jpi,jpj, dU10, dT, dq, Cd_n10, Ce_n10, Ch_n10, sqrt_Cd_n10, sqrt_Cd, L )
1001	CALL wrk_dealloc( jpi,jpj, T_vpot, T_star, q_star, U_star, zeta_u, zeta_t, U_n10 )
1002	CALL wrk_dealloc( jpi,jpj, xlogt, xct, zpsi_hu, zpsi_ht, zpsi_m )
1003	CALL wrk_dealloc( jpi,jpj, stab ) ! interger
1004	!
1005	IF( nn_timing == 1 ) CALL timing_stop('TURB_CORE_2Z')
1006	!
1007	END SUBROUTINE TURB_CORE_2Z
1008
1009
1010	FUNCTION psi_m(zta) !! Psis, L & Y eq. (8c), (8d), (8e)
1011	!-------------------------------------------------------------------------------
1012	REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: zta
1013
1014	REAL(wp), PARAMETER :: pi = 3.141592653589793_wp
1015	REAL(wp), DIMENSION(jpi,jpj) :: psi_m
1016	REAL(wp), DIMENSION(:,:), POINTER :: X2, X, stabit
1017	!-------------------------------------------------------------------------------
1018
1019	CALL wrk_alloc( jpi,jpj, X2, X, stabit )
1020
1021	X2 = sqrt(abs(1. - 16.*zta)) ; X2 = max(X2 , 1.0) ; X = sqrt(X2)
1022	stabit = 0.5 + sign(0.5,zta)
1023	psi_m = -5.ztastabit & ! Stable
1024	& + (1. - stabit)(2log((1. + X)/2) + log((1. + X2)/2) - 2*atan(X) + pi/2) ! Unstable
1025
1026	CALL wrk_dealloc( jpi,jpj, X2, X, stabit )
1027	!
1028	END FUNCTION psi_m
1029
1030
1031	FUNCTION psi_h( zta ) !! Psis, L & Y eq. (8c), (8d), (8e)
1032	!-------------------------------------------------------------------------------
1033	REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: zta
1034	!
1035	REAL(wp), DIMENSION(jpi,jpj) :: psi_h
1036	REAL(wp), DIMENSION(:,:), POINTER :: X2, X, stabit
1037	!-------------------------------------------------------------------------------
1038
1039	CALL wrk_alloc( jpi,jpj, X2, X, stabit )
1040
1041	X2 = sqrt(abs(1. - 16.*zta)) ; X2 = max(X2 , 1.) ; X = sqrt(X2)
1042	stabit = 0.5 + sign(0.5,zta)
1043	psi_h = -5.ztastabit & ! Stable
1044	& + (1. - stabit)(2.log( (1. + X2)/2. )) ! Unstable
1045
1046	CALL wrk_dealloc( jpi,jpj, X2, X, stabit )
1047	!
1048	END FUNCTION psi_h
1049
1050	!!======================================================================
1051	END MODULE sbcblk_core

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

Download in other formats: