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

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

sbcblk_core.F90 in branches/2011/dev_UKM0_2011/NEMOGCM/NEMO/OPA_SRC/SBC – NEMO

Context Navigation

source: branches/2011/dev_UKM0_2011/NEMOGCM/NEMO/OPA_SRC/SBC/sbcblk_core.F90 @ 3291

Last change on this file since 3291 was 3066, checked in by rfurner, 13 years ago
ticket #885 adding changes from branches/2011/dev_r2802_UKMO8_cice between r2802 and r3041
Property svn:keywords set to `Id`
File size: 53.1 KB

Line
1	MODULE sbcblk_core
2	!!======================================================================
3	!! * MODULE sbcblk_core *
4	!! Ocean forcing: momentum, heat and freshwater flux formulation
5	!!=====================================================================
6	!! History : 1.0 ! 2004-08 (U. Schweckendiek) Original code
7	!! 2.0 ! 2005-04 (L. Brodeau, A.M. Treguier) additions:
8	!! - new bulk routine for efficiency
9	!! - WINDS ARE NOW ASSUMED TO BE AT T POINTS in input files !!!!
10	!! - file names and file characteristics in namelist
11	!! - Implement reading of 6-hourly fields
12	!! 3.0 ! 2006-06 (G. Madec) sbc rewritting
13	!! - ! 2006-12 (L. Brodeau) Original code for TURB_CORE_2Z
14	!! 3.2 ! 2009-04 (B. Lemaire) Introduce iom_put
15	!! 3.3 ! 2010-10 (S. Masson) add diurnal cycle
16	!! 3.4 ! 2011-11 (C. Harris) Fill arrays required by CICE
17	!!----------------------------------------------------------------------
18
19	!!----------------------------------------------------------------------
20	!! sbc_blk_core : bulk formulation as ocean surface boundary condition
21	!! (forced mode, CORE bulk formulea)
22	!! blk_oce_core : ocean: computes momentum, heat and freshwater fluxes
23	!! blk_ice_core : ice : computes momentum, heat and freshwater fluxes
24	!! turb_core : computes the CORE turbulent transfer coefficients
25	!!----------------------------------------------------------------------
26	USE oce ! ocean dynamics and tracers
27	USE dom_oce ! ocean space and time domain
28	USE phycst ! physical constants
29	USE fldread ! read input fields
30	USE sbc_oce ! Surface boundary condition: ocean fields
31	USE sbcdcy ! surface boundary condition: diurnal cycle
32	USE iom ! I/O manager library
33	USE in_out_manager ! I/O manager
34	USE lib_mpp ! distribued memory computing library
35	USE lbclnk ! ocean lateral boundary conditions (or mpp link)
36	USE prtctl ! Print control
37	#if defined key_lim3 \|\| defined key_cice
38	USE sbc_ice ! Surface boundary condition: ice fields
39	#endif
40
41	IMPLICIT NONE
42	PRIVATE
43
44	PUBLIC sbc_blk_core ! routine called in sbcmod module
45	PUBLIC blk_ice_core ! routine called in sbc_ice_lim module
46
47	INTEGER , PARAMETER :: jpfld = 9 ! maximum number of files to read
48	INTEGER , PARAMETER :: jp_wndi = 1 ! index of 10m wind velocity (i-component) (m/s) at T-point
49	INTEGER , PARAMETER :: jp_wndj = 2 ! index of 10m wind velocity (j-component) (m/s) at T-point
50	INTEGER , PARAMETER :: jp_humi = 3 ! index of specific humidity ( - )
51	INTEGER , PARAMETER :: jp_qsr = 4 ! index of solar heat (W/m2)
52	INTEGER , PARAMETER :: jp_qlw = 5 ! index of Long wave (W/m2)
53	INTEGER , PARAMETER :: jp_tair = 6 ! index of 10m air temperature (Kelvin)
54	INTEGER , PARAMETER :: jp_prec = 7 ! index of total precipitation (rain+snow) (Kg/m2/s)
55	INTEGER , PARAMETER :: jp_snow = 8 ! index of snow (solid prcipitation) (kg/m2/s)
56	INTEGER , PARAMETER :: jp_tdif = 9 ! index of tau diff associated to HF tau (N/m2) at T-point
57
58	TYPE(FLD), ALLOCATABLE, DIMENSION(:) :: sf ! structure of input fields (file informations, fields read)
59
60	! !!! CORE bulk parameters
61	REAL(wp), PARAMETER :: rhoa = 1.22 ! air density
62	REAL(wp), PARAMETER :: cpa = 1000.5 ! specific heat of air
63	REAL(wp), PARAMETER :: Lv = 2.5e6 ! latent heat of vaporization
64	REAL(wp), PARAMETER :: Ls = 2.839e6 ! latent heat of sublimation
65	REAL(wp), PARAMETER :: Stef = 5.67e-8 ! Stefan Boltzmann constant
66	REAL(wp), PARAMETER :: Cice = 1.63e-3 ! transfer coefficient over ice
67	REAL(wp), PARAMETER :: albo = 0.066 ! ocean albedo assumed to be contant
68
69	! !!* Namelist namsbc_core : CORE bulk parameters
70	LOGICAL :: ln_2m = .FALSE. ! logical flag for height of air temp. and hum
71	LOGICAL :: ln_taudif = .FALSE. ! logical flag to use the "mean of stress module - module of mean stress" data
72	REAL(wp) :: rn_pfac = 1. ! multiplication factor for precipitation
73
74	!! * Substitutions
75	# include "domzgr_substitute.h90"
76	# include "vectopt_loop_substitute.h90"
77	!!----------------------------------------------------------------------
78	!! NEMO/OPA 3.3 , NEMO-consortium (2010)
79	!! $Id$
80	!! Software governed by the CeCILL licence (NEMOGCM/NEMO_CeCILL.txt)
81	!!----------------------------------------------------------------------
82	CONTAINS
83
84	SUBROUTINE sbc_blk_core( kt )
85	!!---------------------------------------------------------------------
86	!! * ROUTINE sbc_blk_core *
87	!!
88	!! ** Purpose : provide at each time step the surface ocean fluxes
89	!! (momentum, heat, freshwater and runoff)
90	!!
91	!! ** Method : (1) READ each fluxes in NetCDF files:
92	!! the 10m wind velocity (i-component) (m/s) at T-point
93	!! the 10m wind velocity (j-component) (m/s) at T-point
94	!! the specific humidity ( - )
95	!! the solar heat (W/m2)
96	!! the Long wave (W/m2)
97	!! the 10m air temperature (Kelvin)
98	!! the total precipitation (rain+snow) (Kg/m2/s)
99	!! the snow (solid prcipitation) (kg/m2/s)
100	!! OPTIONAL parameter (see ln_taudif namelist flag):
101	!! the tau diff associated to HF tau (N/m2) at T-point
102	!! (2) CALL blk_oce_core
103	!!
104	!! C A U T I O N : never mask the surface stress fields
105	!! the stress is assumed to be in the mesh referential
106	!! i.e. the (i,j) referential
107	!!
108	!! ** Action : defined at each time-step at the air-sea interface
109	!! - utau, vtau i- and j-component of the wind stress
110	!! - taum wind stress module at T-point
111	!! - wndm 10m wind module at T-point
112	!! - qns, qsr non-slor and solar heat flux
113	!! - emp, emps evaporation minus precipitation
114	!!----------------------------------------------------------------------
115	INTEGER, INTENT(in) :: kt ! ocean time step
116	!!
117	INTEGER :: ierror ! return error code
118	INTEGER :: ifpr ! dummy loop indice
119	INTEGER :: jfld ! dummy loop arguments
120	!!
121	CHARACTER(len=100) :: cn_dir ! Root directory for location of core files
122	TYPE(FLD_N), DIMENSION(jpfld) :: slf_i ! array of namelist informations on the fields to read
123	TYPE(FLD_N) :: sn_wndi, sn_wndj, sn_humi, sn_qsr ! informations about the fields to be read
124	TYPE(FLD_N) :: sn_qlw , sn_tair, sn_prec, sn_snow ! " "
125	TYPE(FLD_N) :: sn_tdif ! " "
126	NAMELIST/namsbc_core/ cn_dir , ln_2m , ln_taudif, rn_pfac, &
127	& sn_wndi, sn_wndj, sn_humi , sn_qsr , &
128	& sn_qlw , sn_tair, sn_prec , sn_snow, sn_tdif
129	!!---------------------------------------------------------------------
130
131	! ! ====================== !
132	IF( kt == nit000 ) THEN ! First call kt=nit000 !
133	! ! ====================== !
134	! set file information (default values)
135	cn_dir = './' ! directory in which the model is executed
136	!
137	! (NB: frequency positive => hours, negative => months)
138	! ! file ! frequency ! variable ! time intep ! clim ! 'yearly' or ! weights ! rotation !
139	! ! name ! (hours) ! name ! (T/F) ! (T/F) ! 'monthly' ! filename ! pairs !
140	sn_wndi = FLD_N( 'uwnd10m', 24 , 'u_10' , .false. , .false. , 'yearly' , '' , '' )
141	sn_wndj = FLD_N( 'vwnd10m', 24 , 'v_10' , .false. , .false. , 'yearly' , '' , '' )
142	sn_qsr = FLD_N( 'qsw' , 24 , 'qsw' , .false. , .false. , 'yearly' , '' , '' )
143	sn_qlw = FLD_N( 'qlw' , 24 , 'qlw' , .false. , .false. , 'yearly' , '' , '' )
144	sn_tair = FLD_N( 'tair10m', 24 , 't_10' , .false. , .false. , 'yearly' , '' , '' )
145	sn_humi = FLD_N( 'humi10m', 24 , 'q_10' , .false. , .false. , 'yearly' , '' , '' )
146	sn_prec = FLD_N( 'precip' , -1 , 'precip' , .true. , .false. , 'yearly' , '' , '' )
147	sn_snow = FLD_N( 'snow' , -1 , 'snow' , .true. , .false. , 'yearly' , '' , '' )
148	sn_tdif = FLD_N( 'taudif' , 24 , 'taudif' , .true. , .false. , 'yearly' , '' , '' )
149	!
150	REWIND( numnam ) ! read in namlist namsbc_core
151	READ ( numnam, namsbc_core )
152	! ! check: do we plan to use ln_dm2dc with non-daily forcing?
153	IF( ln_dm2dc .AND. sn_qsr%nfreqh /= 24 ) &
154	& CALL ctl_stop( 'sbc_blk_core: ln_dm2dc can be activated only with daily short-wave forcing' )
155	IF( ln_dm2dc .AND. sn_qsr%ln_tint ) THEN
156	CALL ctl_warn( 'sbc_blk_core: ln_dm2dc is taking care of the temporal interpolation of daily qsr', &
157	& ' ==> We force time interpolation = .false. for qsr' )
158	sn_qsr%ln_tint = .false.
159	ENDIF
160	! ! store namelist information in an array
161	slf_i(jp_wndi) = sn_wndi ; slf_i(jp_wndj) = sn_wndj
162	slf_i(jp_qsr ) = sn_qsr ; slf_i(jp_qlw ) = sn_qlw
163	slf_i(jp_tair) = sn_tair ; slf_i(jp_humi) = sn_humi
164	slf_i(jp_prec) = sn_prec ; slf_i(jp_snow) = sn_snow
165	slf_i(jp_tdif) = sn_tdif
166	!
167	lhftau = ln_taudif ! do we use HF tau information?
168	jfld = jpfld - COUNT( (/.NOT. lhftau/) )
169	!
170	ALLOCATE( sf(jfld), STAT=ierror ) ! set sf structure
171	IF( ierror > 0 ) CALL ctl_stop( 'STOP', 'sbc_blk_core: unable to allocate sf structure' )
172	DO ifpr= 1, jfld
173	ALLOCATE( sf(ifpr)%fnow(jpi,jpj,1) )
174	IF( slf_i(ifpr)%ln_tint ) ALLOCATE( sf(ifpr)%fdta(jpi,jpj,1,2) )
175	END DO
176	! ! fill sf with slf_i and control print
177	CALL fld_fill( sf, slf_i, cn_dir, 'sbc_blk_core', 'flux formulation for ocean surface boundary condition', 'namsbc_core' )
178	!
179	ENDIF
180
181	CALL fld_read( kt, nn_fsbc, sf ) ! input fields provided at the current time-step
182
183	! ! surface ocean fluxes computed with CLIO bulk formulea
184	IF( MOD( kt - 1, nn_fsbc ) == 0 ) CALL blk_oce_core( sf, sst_m, ssu_m, ssv_m )
185
186	#if defined key_cice
187	IF( MOD( kt - 1, nn_fsbc ) == 0 ) THEN
188	qlw_ice(:,:,1) = sf(jp_qlw)%fnow(:,:,1)
189	qsr_ice(:,:,1) = sf(jp_qsr)%fnow(:,:,1)
190	tatm_ice(:,:) = sf(jp_tair)%fnow(:,:,1)
191	qatm_ice(:,:) = sf(jp_humi)%fnow(:,:,1)
192	tprecip(:,:) = sf(jp_prec)%fnow(:,:,1) * rn_pfac
193	sprecip(:,:) = sf(jp_snow)%fnow(:,:,1) * rn_pfac
194	wndi_ice(:,:) = sf(jp_wndi)%fnow(:,:,1)
195	wndj_ice(:,:) = sf(jp_wndj)%fnow(:,:,1)
196	ENDIF
197	#endif
198	!
199	END SUBROUTINE sbc_blk_core
200
201
202	SUBROUTINE blk_oce_core( sf, pst, pu, pv )
203	!!---------------------------------------------------------------------
204	!! * ROUTINE blk_core *
205	!!
206	!! ** Purpose : provide the momentum, heat and freshwater fluxes at
207	!! the ocean surface at each time step
208	!!
209	!! ** Method : CORE bulk formulea for the ocean using atmospheric
210	!! fields read in sbc_read
211	!!
212	!! ** Outputs : - utau : i-component of the stress at U-point (N/m2)
213	!! - vtau : j-component of the stress at V-point (N/m2)
214	!! - taum : Wind stress module at T-point (N/m2)
215	!! - wndm : Wind speed module at T-point (m/s)
216	!! - qsr : Solar heat flux over the ocean (W/m2)
217	!! - qns : Non Solar heat flux over the ocean (W/m2)
218	!! - evap : Evaporation over the ocean (kg/m2/s)
219	!! - emp(s) : evaporation minus precipitation (kg/m2/s)
220	!!
221	!! ** Nota : sf has to be a dummy argument for AGRIF on NEC
222	!!---------------------------------------------------------------------
223	USE wrk_nemo, ONLY: wrk_in_use, wrk_not_released
224	USE wrk_nemo, ONLY: zwnd_i => wrk_2d_1 , zwnd_j => wrk_2d_2 ! wind speed components at T-point
225	USE wrk_nemo, ONLY: zqsatw => wrk_2d_3 ! specific humidity at pst
226	USE wrk_nemo, ONLY: zqlw => wrk_2d_4 , zqsb => wrk_2d_5 ! long wave and sensible heat fluxes
227	USE wrk_nemo, ONLY: zqla => wrk_2d_6 , zevap => wrk_2d_7 ! latent heat fluxes and evaporation
228	USE wrk_nemo, ONLY: Cd => wrk_2d_8 ! transfer coefficient for momentum (tau)
229	USE wrk_nemo, ONLY: Ch => wrk_2d_9 ! transfer coefficient for sensible heat (Q_sens)
230	USE wrk_nemo, ONLY: Ce => wrk_2d_10 ! transfer coefficient for evaporation (Q_lat)
231	USE wrk_nemo, ONLY: zst => wrk_2d_11 ! surface temperature in Kelvin
232	USE wrk_nemo, ONLY: zt_zu => wrk_2d_12 ! air temperature at wind speed height
233	USE wrk_nemo, ONLY: zq_zu => wrk_2d_13 ! air spec. hum. at wind speed height
234	!
235	TYPE(fld), INTENT(in), DIMENSION(:) :: sf ! input data
236	REAL(wp) , INTENT(in), DIMENSION(:,:) :: pst ! surface temperature [Celcius]
237	REAL(wp) , INTENT(in), DIMENSION(:,:) :: pu ! surface current at U-point (i-component) [m/s]
238	REAL(wp) , INTENT(in), DIMENSION(:,:) :: pv ! surface current at V-point (j-component) [m/s]
239	!
240	INTEGER :: ji, jj ! dummy loop indices
241	REAL(wp) :: zcoef_qsatw, zztmp ! local variable
242	!!---------------------------------------------------------------------
243
244	IF( wrk_in_use(2, 1,2,3,4,5,6,7,8,9,10,11,12,13) ) THEN
245	CALL ctl_stop('blk_oce_core: requested workspace arrays unavailable') ; RETURN
246	ENDIF
247	!
248	! local scalars ( place there for vector optimisation purposes)
249	zcoef_qsatw = 0.98 * 640380. / rhoa
250
251	zst(:,:) = pst(:,:) + rt0 ! converte Celcius to Kelvin (and set minimum value far above 0 K)
252
253	! ----------------------------------------------------------------------------- !
254	! 0 Wind components and module at T-point relative to the moving ocean !
255	! ----------------------------------------------------------------------------- !
256
257	! ... components ( U10m - U_oce ) at T-point (unmasked)
258	zwnd_i(:,:) = 0.e0
259	zwnd_j(:,:) = 0.e0
260	#if defined key_vectopt_loop
261	!CDIR COLLAPSE
262	#endif
263	DO jj = 2, jpjm1
264	DO ji = fs_2, fs_jpim1 ! vect. opt.
265	zwnd_i(ji,jj) = ( sf(jp_wndi)%fnow(ji,jj,1) - 0.5 * ( pu(ji-1,jj ) + pu(ji,jj) ) )
266	zwnd_j(ji,jj) = ( sf(jp_wndj)%fnow(ji,jj,1) - 0.5 * ( pv(ji ,jj-1) + pv(ji,jj) ) )
267	END DO
268	END DO
269	CALL lbc_lnk( zwnd_i(:,:) , 'T', -1. )
270	CALL lbc_lnk( zwnd_j(:,:) , 'T', -1. )
271	! ... scalar wind ( = \| U10m - U_oce \| ) at T-point (masked)
272	!CDIR NOVERRCHK
273	!CDIR COLLAPSE
274	wndm(:,:) = SQRT( zwnd_i(:,:) * zwnd_i(:,:) &
275	& + zwnd_j(:,:) * zwnd_j(:,:) ) * tmask(:,:,1)
276
277	! ----------------------------------------------------------------------------- !
278	! I Radiative FLUXES !
279	! ----------------------------------------------------------------------------- !
280
281	! ocean albedo assumed to be constant + modify now Qsr to include the diurnal cycle ! Short Wave
282	zztmp = 1. - albo
283	IF( ln_dm2dc ) THEN ; qsr(:,:) = zztmp * sbc_dcy( sf(jp_qsr)%fnow(:,:,1) ) * tmask(:,:,1)
284	ELSE ; qsr(:,:) = zztmp * sf(jp_qsr)%fnow(:,:,1) * tmask(:,:,1)
285	ENDIF
286	!CDIR COLLAPSE
287	zqlw(:,:) = ( sf(jp_qlw)%fnow(:,:,1) - Stef * zst(:,:)zst(:,:)zst(:,:)zst(:,:) ) tmask(:,:,1) ! Long Wave
288	! ----------------------------------------------------------------------------- !
289	! II Turbulent FLUXES !
290	! ----------------------------------------------------------------------------- !
291
292	! ... specific humidity at SST and IST
293	!CDIR NOVERRCHK
294	!CDIR COLLAPSE
295	zqsatw(:,:) = zcoef_qsatw * EXP( -5107.4 / zst(:,:) )
296
297	! ... NCAR Bulk formulae, computation of Cd, Ch, Ce at T-point :
298	IF( ln_2m ) THEN
299	!! If air temp. and spec. hum. are given at different height (2m) than wind (10m) :
300	CALL TURB_CORE_2Z(2.,10., zst , sf(jp_tair)%fnow, &
301	& zqsatw, sf(jp_humi)%fnow, wndm, &
302	& Cd , Ch , Ce , &
303	& zt_zu , zq_zu )
304	ELSE
305	!! If air temp. and spec. hum. are given at same height than wind (10m) :
306	!gm bug? at the compiling phase, add a copy in temporary arrays... ==> check perf
307	! CALL TURB_CORE_1Z( 10., zst (:,:), sf(jp_tair)%fnow(:,:), &
308	! & zqsatw(:,:), sf(jp_humi)%fnow(:,:), wndm(:,:), &
309	! & Cd (:,:), Ch (:,:), Ce (:,:) )
310	!gm bug
311	! ARPDBG - this won't compile with gfortran. Fix but check performance
312	! as per comment above.
313	CALL TURB_CORE_1Z( 10., zst , sf(jp_tair)%fnow(:,:,1), &
314	& zqsatw, sf(jp_humi)%fnow(:,:,1), wndm, &
315	& Cd , Ch , Ce )
316	ENDIF
317
318	! ... tau module, i and j component
319	DO jj = 1, jpj
320	DO ji = 1, jpi
321	zztmp = rhoa * wndm(ji,jj) * Cd(ji,jj)
322	taum (ji,jj) = zztmp * wndm (ji,jj)
323	zwnd_i(ji,jj) = zztmp * zwnd_i(ji,jj)
324	zwnd_j(ji,jj) = zztmp * zwnd_j(ji,jj)
325	END DO
326	END DO
327
328	! ... add the HF tau contribution to the wind stress module?
329	IF( lhftau ) THEN
330	!CDIR COLLAPSE
331	taum(:,:) = taum(:,:) + sf(jp_tdif)%fnow(:,:,1)
332	ENDIF
333	CALL iom_put( "taum_oce", taum ) ! output wind stress module
334
335	! ... utau, vtau at U- and V_points, resp.
336	! Note the use of 0.5*(2-umask) in order to unmask the stress along coastlines
337	DO jj = 1, jpjm1
338	DO ji = 1, fs_jpim1
339	utau(ji,jj) = 0.5 * ( 2. - umask(ji,jj,1) ) * ( zwnd_i(ji,jj) + zwnd_i(ji+1,jj ) )
340	vtau(ji,jj) = 0.5 * ( 2. - vmask(ji,jj,1) ) * ( zwnd_j(ji,jj) + zwnd_j(ji ,jj+1) )
341	END DO
342	END DO
343	CALL lbc_lnk( utau(:,:), 'U', -1. )
344	CALL lbc_lnk( vtau(:,:), 'V', -1. )
345
346	! Turbulent fluxes over ocean
347	! -----------------------------
348	IF( ln_2m ) THEN
349	! Values of temp. and hum. adjusted to 10m must be used instead of 2m values
350	zevap(:,:) = MAX( 0.e0, rhoa Ce(:,:)( zqsatw(:,:) - zq_zu(:,:) ) * wndm(:,:) ) ! Evaporation
351	zqsb (:,:) = rhoacpaCh(:,:)( zst (:,:) - zt_zu(:,:) ) wndm(:,:) ! Sensible Heat
352	ELSE
353	!CDIR COLLAPSE
354	zevap(:,:) = MAX( 0.e0, rhoa Ce(:,:)( zqsatw(:,:) - sf(jp_humi)%fnow(:,:,1) ) * wndm(:,:) ) ! Evaporation
355	!CDIR COLLAPSE
356	zqsb (:,:) = rhoacpaCh(:,:)( zst (:,:) - sf(jp_tair)%fnow(:,:,1) ) wndm(:,:) ! Sensible Heat
357	ENDIF
358	!CDIR COLLAPSE
359	zqla (:,:) = Lv * zevap(:,:) ! Latent Heat
360
361	IF(ln_ctl) THEN
362	CALL prt_ctl( tab2d_1=zqla , clinfo1=' blk_oce_core: zqla : ', tab2d_2=Ce , clinfo2=' Ce : ' )
363	CALL prt_ctl( tab2d_1=zqsb , clinfo1=' blk_oce_core: zqsb : ', tab2d_2=Ch , clinfo2=' Ch : ' )
364	CALL prt_ctl( tab2d_1=zqlw , clinfo1=' blk_oce_core: zqlw : ', tab2d_2=qsr, clinfo2=' qsr : ' )
365	CALL prt_ctl( tab2d_1=zqsatw, clinfo1=' blk_oce_core: zqsatw : ', tab2d_2=zst, clinfo2=' zst : ' )
366	CALL prt_ctl( tab2d_1=utau , clinfo1=' blk_oce_core: utau : ', mask1=umask, &
367	& tab2d_2=vtau , clinfo2= ' vtau : ' , mask2=vmask )
368	CALL prt_ctl( tab2d_1=wndm , clinfo1=' blk_oce_core: wndm : ')
369	CALL prt_ctl( tab2d_1=zst , clinfo1=' blk_oce_core: zst : ')
370	ENDIF
371
372	! ----------------------------------------------------------------------------- !
373	! III Total FLUXES !
374	! ----------------------------------------------------------------------------- !
375
376	!CDIR COLLAPSE
377	qns(:,:) = zqlw(:,:) - zqsb(:,:) - zqla(:,:) ! Downward Non Solar flux
378	!CDIR COLLAPSE
379	emp(:,:) = zevap(:,:) - sf(jp_prec)%fnow(:,:,1) * rn_pfac * tmask(:,:,1)
380	!CDIR COLLAPSE
381	emps(:,:) = emp(:,:)
382	!
383	CALL iom_put( "qlw_oce", zqlw ) ! output downward longwave heat over the ocean
384	CALL iom_put( "qsb_oce", - zqsb ) ! output downward sensible heat over the ocean
385	CALL iom_put( "qla_oce", - zqla ) ! output downward latent heat over the ocean
386	CALL iom_put( "qns_oce", qns ) ! output downward non solar heat over the ocean
387	!
388	IF(ln_ctl) THEN
389	CALL prt_ctl(tab2d_1=zqsb , clinfo1=' blk_oce_core: zqsb : ', tab2d_2=zqlw , clinfo2=' zqlw : ')
390	CALL prt_ctl(tab2d_1=zqla , clinfo1=' blk_oce_core: zqla : ', tab2d_2=qsr , clinfo2=' qsr : ')
391	CALL prt_ctl(tab2d_1=pst , clinfo1=' blk_oce_core: pst : ', tab2d_2=emp , clinfo2=' emp : ')
392	CALL prt_ctl(tab2d_1=utau , clinfo1=' blk_oce_core: utau : ', mask1=umask, &
393	& tab2d_2=vtau , clinfo2= ' vtau : ' , mask2=vmask )
394	ENDIF
395	!
396	IF( wrk_not_released(2, 1,2,3,4,5,6,7,8,9,10,11,12,13) ) &
397	CALL ctl_stop('blk_oce_core: failed to release workspace arrays')
398	!
399	END SUBROUTINE blk_oce_core
400
401
402	SUBROUTINE blk_ice_core( pst , pui , pvi , palb , &
403	& p_taui, p_tauj, p_qns , p_qsr, &
404	& p_qla , p_dqns, p_dqla, &
405	& p_tpr , p_spr , &
406	& p_fr1 , p_fr2 , cd_grid, pdim )
407	!!---------------------------------------------------------------------
408	!! * ROUTINE blk_ice_core *
409	!!
410	!! ** Purpose : provide the surface boundary condition over sea-ice
411	!!
412	!! ** Method : compute momentum, heat and freshwater exchanged
413	!! between atmosphere and sea-ice using CORE bulk
414	!! formulea, ice variables and read atmmospheric fields.
415	!! NB: ice drag coefficient is assumed to be a constant
416	!!
417	!! caution : the net upward water flux has with mm/day unit
418	!!---------------------------------------------------------------------
419	USE wrk_nemo, ONLY: wrk_in_use, wrk_not_released
420	USE wrk_nemo, ONLY: z_wnds_t => wrk_2d_1 ! wind speed ( = \| U10m - U_ice \| ) at T-point
421	USE wrk_nemo, ONLY: wrk_3d_4 , wrk_3d_5 , wrk_3d_6 , wrk_3d_7
422	!!
423	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: pst ! ice surface temperature (>0, =rt0 over land) [Kelvin]
424	REAL(wp), DIMENSION(:,:) , INTENT(in ) :: pui ! ice surface velocity (i- and i- components [m/s]
425	REAL(wp), DIMENSION(:,:) , INTENT(in ) :: pvi ! at I-point (B-grid) or U & V-point (C-grid)
426	REAL(wp), DIMENSION(:,:,:), INTENT(in ) :: palb ! ice albedo (clear sky) (alb_ice_cs) [%]
427	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_taui ! i- & j-components of surface ice stress [N/m2]
428	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_tauj ! at I-point (B-grid) or U & V-point (C-grid)
429	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qns ! non solar heat flux over ice (T-point) [W/m2]
430	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qsr ! solar heat flux over ice (T-point) [W/m2]
431	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_qla ! latent heat flux over ice (T-point) [W/m2]
432	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_dqns ! non solar heat sensistivity (T-point) [W/m2]
433	REAL(wp), DIMENSION(:,:,:), INTENT( out) :: p_dqla ! latent heat sensistivity (T-point) [W/m2]
434	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_tpr ! total precipitation (T-point) [Kg/m2/s]
435	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_spr ! solid precipitation (T-point) [Kg/m2/s]
436	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_fr1 ! 1sr fraction of qsr penetration in ice (T-point) [%]
437	REAL(wp), DIMENSION(:,:) , INTENT( out) :: p_fr2 ! 2nd fraction of qsr penetration in ice (T-point) [%]
438	CHARACTER(len=1) , INTENT(in ) :: cd_grid ! ice grid ( C or B-grid)
439	INTEGER , INTENT(in ) :: pdim ! number of ice categories
440	!!
441	INTEGER :: ji, jj, jl ! dummy loop indices
442	INTEGER :: ijpl ! number of ice categories (size of 3rd dim of input arrays)
443	REAL(wp) :: zst2, zst3
444	REAL(wp) :: zcoef_wnorm, zcoef_wnorm2, zcoef_dqlw, zcoef_dqla, zcoef_dqsb
445	REAL(wp) :: zztmp ! temporary variable
446	REAL(wp) :: zcoef_frca ! fractional cloud amount
447	REAL(wp) :: zwnorm_f, zwndi_f , zwndj_f ! relative wind module and components at F-point
448	REAL(wp) :: zwndi_t , zwndj_t ! relative wind components at T-point
449	!!
450	REAL(wp), DIMENSION(:,:,:), POINTER :: z_qlw ! long wave heat flux over ice
451	REAL(wp), DIMENSION(:,:,:), POINTER :: z_qsb ! sensible heat flux over ice
452	REAL(wp), DIMENSION(:,:,:), POINTER :: z_dqlw ! long wave heat sensitivity over ice
453	REAL(wp), DIMENSION(:,:,:), POINTER :: z_dqsb ! sensible heat sensitivity over ice
454	!!---------------------------------------------------------------------
455
456	ijpl = pdim ! number of ice categories
457
458	! Set-up access to workspace arrays
459	IF( wrk_in_use(2, 1) .OR. wrk_in_use(3, 4,5,6,7) ) THEN
460	CALL ctl_stop('blk_ice_core: requested workspace arrays unavailable') ; RETURN
461	ELSE IF(ijpl > jpk) THEN
462	CALL ctl_stop('blk_ice_core: no. of ice categories > jpk so wrk_nemo 3D workspaces cannot be used.')
463	RETURN
464	END IF
465	! Set-up pointers to sub-arrays of workspaces
466	z_qlw => wrk_3d_4(:,:,1:ijpl)
467	z_qsb => wrk_3d_5(:,:,1:ijpl)
468	z_dqlw => wrk_3d_6(:,:,1:ijpl)
469	z_dqsb => wrk_3d_7(:,:,1:ijpl)
470
471	! local scalars ( place there for vector optimisation purposes)
472	zcoef_wnorm = rhoa * Cice
473	zcoef_wnorm2 = rhoa * Cice * 0.5
474	zcoef_dqlw = 4.0 * 0.95 * Stef
475	zcoef_dqla = -Ls * Cice * 11637800. * (-5897.8)
476	zcoef_dqsb = rhoa * cpa * Cice
477	zcoef_frca = 1.0 - 0.3
478
479	!!gm brutal....
480	z_wnds_t(:,:) = 0.e0
481	p_taui (:,:) = 0.e0
482	p_tauj (:,:) = 0.e0
483	!!gm end
484
485	#if defined key_lim3
486	tatm_ice(:,:) = sf(jp_tair)%fnow(:,:,1) ! LIM3: make Tair available in sea-ice. WARNING allocated after call to ice_init
487	#endif
488	! ----------------------------------------------------------------------------- !
489	! Wind components and module relative to the moving ocean ( U10m - U_ice ) !
490	! ----------------------------------------------------------------------------- !
491	SELECT CASE( cd_grid )
492	CASE( 'I' ) ! B-grid ice dynamics : I-point (i.e. F-point with sea-ice indexation)
493	! and scalar wind at T-point ( = \| U10m - U_ice \| ) (masked)
494	!CDIR NOVERRCHK
495	DO jj = 2, jpjm1
496	DO ji = 2, jpim1 ! B grid : NO vector opt
497	! ... scalar wind at I-point (fld being at T-point)
498	zwndi_f = 0.25 * ( sf(jp_wndi)%fnow(ji-1,jj ,1) + sf(jp_wndi)%fnow(ji ,jj ,1) &
499	& + sf(jp_wndi)%fnow(ji-1,jj-1,1) + sf(jp_wndi)%fnow(ji ,jj-1,1) ) - pui(ji,jj)
500	zwndj_f = 0.25 * ( sf(jp_wndj)%fnow(ji-1,jj ,1) + sf(jp_wndj)%fnow(ji ,jj ,1) &
501	& + sf(jp_wndj)%fnow(ji-1,jj-1,1) + sf(jp_wndj)%fnow(ji ,jj-1,1) ) - pvi(ji,jj)
502	zwnorm_f = zcoef_wnorm * SQRT( zwndi_f * zwndi_f + zwndj_f * zwndj_f )
503	! ... ice stress at I-point
504	p_taui(ji,jj) = zwnorm_f * zwndi_f
505	p_tauj(ji,jj) = zwnorm_f * zwndj_f
506	! ... scalar wind at T-point (fld being at T-point)
507	zwndi_t = sf(jp_wndi)%fnow(ji,jj,1) - 0.25 * ( pui(ji,jj+1) + pui(ji+1,jj+1) &
508	& + pui(ji,jj ) + pui(ji+1,jj ) )
509	zwndj_t = sf(jp_wndj)%fnow(ji,jj,1) - 0.25 * ( pvi(ji,jj+1) + pvi(ji+1,jj+1) &
510	& + pvi(ji,jj ) + pvi(ji+1,jj ) )
511	z_wnds_t(ji,jj) = SQRT( zwndi_t * zwndi_t + zwndj_t * zwndj_t ) * tmask(ji,jj,1)
512	END DO
513	END DO
514	CALL lbc_lnk( p_taui , 'I', -1. )
515	CALL lbc_lnk( p_tauj , 'I', -1. )
516	CALL lbc_lnk( z_wnds_t, 'T', 1. )
517	!
518	CASE( 'C' ) ! C-grid ice dynamics : U & V-points (same as ocean)
519	#if defined key_vectopt_loop
520	!CDIR COLLAPSE
521	#endif
522	DO jj = 2, jpj
523	DO ji = fs_2, jpi ! vect. opt.
524	zwndi_t = ( sf(jp_wndi)%fnow(ji,jj,1) - 0.5 * ( pui(ji-1,jj ) + pui(ji,jj) ) )
525	zwndj_t = ( sf(jp_wndj)%fnow(ji,jj,1) - 0.5 * ( pvi(ji ,jj-1) + pvi(ji,jj) ) )
526	z_wnds_t(ji,jj) = SQRT( zwndi_t * zwndi_t + zwndj_t * zwndj_t ) * tmask(ji,jj,1)
527	END DO
528	END DO
529	#if defined key_vectopt_loop
530	!CDIR COLLAPSE
531	#endif
532	DO jj = 2, jpjm1
533	DO ji = fs_2, fs_jpim1 ! vect. opt.
534	p_taui(ji,jj) = zcoef_wnorm2 * ( z_wnds_t(ji+1,jj ) + z_wnds_t(ji,jj) ) &
535	& * ( 0.5 * (sf(jp_wndi)%fnow(ji+1,jj,1) + sf(jp_wndi)%fnow(ji,jj,1) ) - pui(ji,jj) )
536	p_tauj(ji,jj) = zcoef_wnorm2 * ( z_wnds_t(ji,jj+1 ) + z_wnds_t(ji,jj) ) &
537	& * ( 0.5 * (sf(jp_wndj)%fnow(ji,jj+1,1) + sf(jp_wndj)%fnow(ji,jj,1) ) - pvi(ji,jj) )
538	END DO
539	END DO
540	CALL lbc_lnk( p_taui , 'U', -1. )
541	CALL lbc_lnk( p_tauj , 'V', -1. )
542	CALL lbc_lnk( z_wnds_t, 'T', 1. )
543	!
544	END SELECT
545
546	zztmp = 1. / ( 1. - albo )
547	! ! ========================== !
548	DO jl = 1, ijpl ! Loop over ice categories !
549	! ! ========================== !
550	!CDIR NOVERRCHK
551	!CDIR COLLAPSE
552	DO jj = 1 , jpj
553	!CDIR NOVERRCHK
554	DO ji = 1, jpi
555	! ----------------------------!
556	! I Radiative FLUXES !
557	! ----------------------------!
558	zst2 = pst(ji,jj,jl) * pst(ji,jj,jl)
559	zst3 = pst(ji,jj,jl) * zst2
560	! Short Wave (sw)
561	p_qsr(ji,jj,jl) = zztmp * ( 1. - palb(ji,jj,jl) ) * qsr(ji,jj)
562	! Long Wave (lw)
563	z_qlw(ji,jj,jl) = 0.95 * ( sf(jp_qlw)%fnow(ji,jj,1) - Stef * pst(ji,jj,jl) * zst3 ) * tmask(ji,jj,1)
564	! lw sensitivity
565	z_dqlw(ji,jj,jl) = zcoef_dqlw * zst3
566
567	! ----------------------------!
568	! II Turbulent FLUXES !
569	! ----------------------------!
570
571	! ... turbulent heat fluxes
572	! Sensible Heat
573	z_qsb(ji,jj,jl) = rhoa * cpa * Cice * z_wnds_t(ji,jj) * ( pst(ji,jj,jl) - sf(jp_tair)%fnow(ji,jj,1) )
574	! Latent Heat
575	p_qla(ji,jj,jl) = MAX( 0.e0, rhoa * Ls * Cice * z_wnds_t(ji,jj) &
576	& * ( 11637800. * EXP( -5897.8 / pst(ji,jj,jl) ) / rhoa - sf(jp_humi)%fnow(ji,jj,1) ) )
577	! Latent heat sensitivity for ice (Dqla/Dt)
578	p_dqla(ji,jj,jl) = zcoef_dqla * z_wnds_t(ji,jj) / ( zst2 ) * EXP( -5897.8 / pst(ji,jj,jl) )
579	! Sensible heat sensitivity (Dqsb_ice/Dtn_ice)
580	z_dqsb(ji,jj,jl) = zcoef_dqsb * z_wnds_t(ji,jj)
581
582	! ----------------------------!
583	! III Total FLUXES !
584	! ----------------------------!
585	! Downward Non Solar flux
586	p_qns (ji,jj,jl) = z_qlw (ji,jj,jl) - z_qsb (ji,jj,jl) - p_qla (ji,jj,jl)
587	! Total non solar heat flux sensitivity for ice
588	p_dqns(ji,jj,jl) = - ( z_dqlw(ji,jj,jl) + z_dqsb(ji,jj,jl) + p_dqla(ji,jj,jl) )
589	END DO
590	!
591	END DO
592	!
593	END DO
594	!
595	!--------------------------------------------------------------------
596	! FRACTIONs of net shortwave radiation which is not absorbed in the
597	! thin surface layer and penetrates inside the ice cover
598	! ( Maykut and Untersteiner, 1971 ; Ebert and Curry, 1993 )
599
600	!CDIR COLLAPSE
601	p_fr1(:,:) = ( 0.18 * ( 1.0 - zcoef_frca ) + 0.35 * zcoef_frca )
602	!CDIR COLLAPSE
603	p_fr2(:,:) = ( 0.82 * ( 1.0 - zcoef_frca ) + 0.65 * zcoef_frca )
604
605	!CDIR COLLAPSE
606	p_tpr(:,:) = sf(jp_prec)%fnow(:,:,1) * rn_pfac ! total precipitation [kg/m2/s]
607	!CDIR COLLAPSE
608	p_spr(:,:) = sf(jp_snow)%fnow(:,:,1) * rn_pfac ! solid precipitation [kg/m2/s]
609	CALL iom_put( 'snowpre', p_spr ) ! Snow precipitation
610	!
611	IF(ln_ctl) THEN
612	CALL prt_ctl(tab3d_1=p_qla , clinfo1=' blk_ice_core: p_qla : ', tab3d_2=z_qsb , clinfo2=' z_qsb : ', kdim=ijpl)
613	CALL prt_ctl(tab3d_1=z_qlw , clinfo1=' blk_ice_core: z_qlw : ', tab3d_2=p_dqla , clinfo2=' p_dqla : ', kdim=ijpl)
614	CALL prt_ctl(tab3d_1=z_dqsb , clinfo1=' blk_ice_core: z_dqsb : ', tab3d_2=z_dqlw , clinfo2=' z_dqlw : ', kdim=ijpl)
615	CALL prt_ctl(tab3d_1=p_dqns , clinfo1=' blk_ice_core: p_dqns : ', tab3d_2=p_qsr , clinfo2=' p_qsr : ', kdim=ijpl)
616	CALL prt_ctl(tab3d_1=pst , clinfo1=' blk_ice_core: pst : ', tab3d_2=p_qns , clinfo2=' p_qns : ', kdim=ijpl)
617	CALL prt_ctl(tab2d_1=p_tpr , clinfo1=' blk_ice_core: p_tpr : ', tab2d_2=p_spr , clinfo2=' p_spr : ')
618	CALL prt_ctl(tab2d_1=p_taui , clinfo1=' blk_ice_core: p_taui : ', tab2d_2=p_tauj , clinfo2=' p_tauj : ')
619	CALL prt_ctl(tab2d_1=z_wnds_t, clinfo1=' blk_ice_core: z_wnds_t : ')
620	ENDIF
621
622	IF( wrk_not_released(2, 1) .OR. &
623	wrk_not_released(3, 4,5,6,7) ) CALL ctl_stop('blk_ice_core: failed to release workspace arrays')
624	!
625	END SUBROUTINE blk_ice_core
626
627
628	SUBROUTINE TURB_CORE_1Z(zu, sst, T_a, q_sat, q_a, &
629	& dU , Cd , Ch , Ce )
630	!!----------------------------------------------------------------------
631	!! * ROUTINE turb_core *
632	!!
633	!! ** Purpose : Computes turbulent transfert coefficients of surface
634	!! fluxes according to Large & Yeager (2004)
635	!!
636	!! ** 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
637	!! Momentum, Latent and sensible heat exchange coefficients
638	!! Caution: this procedure should only be used in cases when air
639	!! temperature (T_air), air specific humidity (q_air) and wind (dU)
640	!! are provided at the same height 'zzu'!
641	!!
642	!! References : Large & Yeager, 2004 : ???
643	!!----------------------------------------------------------------------
644	USE wrk_nemo, ONLY: wrk_in_use, wrk_not_released, iwrk_in_use, iwrk_not_released
645	USE wrk_nemo, ONLY: dU10 => wrk_2d_14 ! dU [m/s]
646	USE wrk_nemo, ONLY: dT => wrk_2d_15 ! air/sea temperature difference [K]
647	USE wrk_nemo, ONLY: dq => wrk_2d_16 ! air/sea humidity difference [K]
648	USE wrk_nemo, ONLY: Cd_n10 => wrk_2d_17 ! 10m neutral drag coefficient
649	USE wrk_nemo, ONLY: Ce_n10 => wrk_2d_18 ! 10m neutral latent coefficient
650	USE wrk_nemo, ONLY: Ch_n10 => wrk_2d_19 ! 10m neutral sensible coefficient
651	USE wrk_nemo, ONLY: sqrt_Cd_n10 => wrk_2d_20 ! root square of Cd_n10
652	USE wrk_nemo, ONLY: sqrt_Cd => wrk_2d_21 ! root square of Cd
653	USE wrk_nemo, ONLY: T_vpot => wrk_2d_22 ! virtual potential temperature [K]
654	USE wrk_nemo, ONLY: T_star => wrk_2d_23 ! turbulent scale of tem. fluct.
655	USE wrk_nemo, ONLY: q_star => wrk_2d_24 ! turbulent humidity of temp. fluct.
656	USE wrk_nemo, ONLY: U_star => wrk_2d_25 ! turb. scale of velocity fluct.
657	USE wrk_nemo, ONLY: L => wrk_2d_26 ! Monin-Obukov length [m]
658	USE wrk_nemo, ONLY: zeta => wrk_2d_27 ! stability parameter at height zu
659	USE wrk_nemo, ONLY: U_n10 => wrk_2d_28 ! neutral wind velocity at 10m [m]
660	USE wrk_nemo, ONLY: xlogt => wrk_2d_29, xct => wrk_2d_30, &
661	zpsi_h => wrk_2d_31, zpsi_m => wrk_2d_32
662	USE wrk_nemo, ONLY: stab => iwrk_2d_1 ! 1st guess stability test integer
663	!
664	REAL(wp) , INTENT(in ) :: zu ! altitude of wind measurement [m]
665	REAL(wp), DIMENSION(:,:), INTENT(in ) :: sst ! sea surface temperature [Kelvin]
666	REAL(wp), DIMENSION(:,:), INTENT(in ) :: T_a ! potential air temperature [Kelvin]
667	REAL(wp), DIMENSION(:,:), INTENT(in ) :: q_sat ! sea surface specific humidity [kg/kg]
668	REAL(wp), DIMENSION(:,:), INTENT(in ) :: q_a ! specific air humidity [kg/kg]
669	REAL(wp), DIMENSION(:,:), INTENT(in ) :: dU ! wind module \|U(zu)-U(0)\| [m/s]
670	REAL(wp), DIMENSION(:,:), INTENT( out) :: Cd ! transfert coefficient for momentum (tau)
671	REAL(wp), DIMENSION(:,:), INTENT( out) :: Ch ! transfert coefficient for temperature (Q_sens)
672	REAL(wp), DIMENSION(:,:), INTENT( out) :: Ce ! transfert coefficient for evaporation (Q_lat)
673	!!
674	INTEGER :: j_itt
675	INTEGER , PARAMETER :: nb_itt = 3
676	REAL(wp), PARAMETER :: grav = 9.8 ! gravity
677	REAL(wp), PARAMETER :: kappa = 0.4 ! von Karman s constant
678	!!----------------------------------------------------------------------
679
680	IF( wrk_in_use(2, 14,15,16,17,18,19, &
681	20,21,22,23,24,25,26,27,28,29, &
682	30,31,32) .OR. &
683	iwrk_in_use(2, 1) ) THEN
684	CALL ctl_stop('TURB_CORE_1Z: requested workspace arrays unavailable') ; RETURN
685	ENDIF
686
687	!! * Start
688	!! Air/sea differences
689	dU10 = max(0.5, dU) ! we don't want to fall under 0.5 m/s
690	dT = T_a - sst ! assuming that T_a is allready the potential temp. at zzu
691	dq = q_a - q_sat
692	!!
693	!! Virtual potential temperature
694	T_vpot = T_a(1. + 0.608q_a)
695	!!
696	!! Neutral Drag Coefficient
697	stab = 0.5 + sign(0.5,dT) ! stable : stab = 1 ; unstable : stab = 0
698	Cd_n10 = 1E-3 * ( 2.7/dU10 + 0.142 + dU10/13.09 ) ! L & Y eq. (6a)
699	sqrt_Cd_n10 = sqrt(Cd_n10)
700	Ce_n10 = 1E-3 * ( 34.6 * sqrt_Cd_n10 ) ! L & Y eq. (6b)
701	Ch_n10 = 1E-3sqrt_Cd_n10(18stab + 32.7(1-stab)) ! L & Y eq. (6c), (6d)
702	!!
703	!! Initializing transfert coefficients with their first guess neutral equivalents :
704	Cd = Cd_n10 ; Ce = Ce_n10 ; Ch = Ch_n10 ; sqrt_Cd = sqrt(Cd)
705
706	!! * Now starting iteration loop
707	DO j_itt=1, nb_itt
708	!! Turbulent scales :
709	U_star = sqrt_Cd*dU10 ! L & Y eq. (7a)
710	T_star = Ch/sqrt_Cd*dT ! L & Y eq. (7b)
711	q_star = Ce/sqrt_Cd*dq ! L & Y eq. (7c)
712
713	!! Estimate the Monin-Obukov length :
714	L = (U_star*2)/( kappagrav*(T_star/T_vpot + q_star/(q_a + 1./0.608)) )
715
716	!! Stability parameters :
717	zeta = zu/L ; zeta = sign( min(abs(zeta),10.0), zeta )
718	zpsi_h = psi_h(zeta)
719	zpsi_m = psi_m(zeta)
720
721	!! Shifting the wind speed to 10m and neutral stability :
722	U_n10 = dU101./(1. + sqrt_Cd_n10/kappa(log(zu/10.) - zpsi_m)) ! L & Y eq. (9a)
723
724	!! Updating the neutral 10m transfer coefficients :
725	Cd_n10 = 1E-3 * (2.7/U_n10 + 0.142 + U_n10/13.09) ! L & Y eq. (6a)
726	sqrt_Cd_n10 = sqrt(Cd_n10)
727	Ce_n10 = 1E-3 * (34.6 * sqrt_Cd_n10) ! L & Y eq. (6b)
728	stab = 0.5 + sign(0.5,zeta)
729	Ch_n10 = 1E-3sqrt_Cd_n10(18.stab + 32.7(1-stab)) ! L & Y eq. (6c), (6d)
730
731	!! Shifting the neutral 10m transfer coefficients to ( zu , zeta ) :
732	!!
733	xct = 1. + sqrt_Cd_n10/kappa*(log(zu/10) - zpsi_m)
734	Cd = Cd_n10/(xct*xct) ; sqrt_Cd = sqrt(Cd)
735	!!
736	xlogt = log(zu/10.) - zpsi_h
737	!!
738	xct = 1. + Ch_n10*xlogt/kappa/sqrt_Cd_n10
739	Ch = Ch_n10*sqrt_Cd/sqrt_Cd_n10/xct
740	!!
741	xct = 1. + Ce_n10*xlogt/kappa/sqrt_Cd_n10
742	Ce = Ce_n10*sqrt_Cd/sqrt_Cd_n10/xct
743	!!
744	END DO
745	!!
746	IF( wrk_not_released(2, 14,15,16,17,18,19, &
747	& 20,21,22,23,24,25,26,27,28,29, &
748	& 30,31,32 ) .OR. &
749	iwrk_not_released(2, 1) ) &
750	CALL ctl_stop('TURB_CORE_1Z: failed to release workspace arrays')
751	!
752	END SUBROUTINE TURB_CORE_1Z
753
754
755	SUBROUTINE TURB_CORE_2Z(zt, zu, sst, T_zt, q_sat, q_zt, dU, Cd, Ch, Ce, T_zu, q_zu)
756	!!----------------------------------------------------------------------
757	!! * ROUTINE turb_core *
758	!!
759	!! ** Purpose : Computes turbulent transfert coefficients of surface
760	!! fluxes according to Large & Yeager (2004).
761	!!
762	!! ** 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
763	!! Momentum, Latent and sensible heat exchange coefficients
764	!! Caution: this procedure should only be used in cases when air
765	!! temperature (T_air) and air specific humidity (q_air) are at 2m
766	!! whereas wind (dU) is at 10m.
767	!!
768	!! References : Large & Yeager, 2004 : ???
769	!!----------------------------------------------------------------------
770	USE wrk_nemo, ONLY: wrk_in_use, wrk_not_released, iwrk_in_use, iwrk_not_released
771	USE wrk_nemo, ONLY: dU10 => wrk_2d_14 ! dU [m/s]
772	USE wrk_nemo, ONLY: dT => wrk_2d_15 ! air/sea temperature difference [K]
773	USE wrk_nemo, ONLY: dq => wrk_2d_16 ! air/sea humidity difference [K]
774	USE wrk_nemo, ONLY: Cd_n10 => wrk_2d_17 ! 10m neutral drag coefficient
775	USE wrk_nemo, ONLY: Ce_n10 => wrk_2d_18 ! 10m neutral latent coefficient
776	USE wrk_nemo, ONLY: Ch_n10 => wrk_2d_19 ! 10m neutral sensible coefficient
777	USE wrk_nemo, ONLY: sqrt_Cd_n10 => wrk_2d_20 ! root square of Cd_n10
778	USE wrk_nemo, ONLY: sqrt_Cd => wrk_2d_21 ! root square of Cd
779	USE wrk_nemo, ONLY: T_vpot => wrk_2d_22 ! virtual potential temperature [K]
780	USE wrk_nemo, ONLY: T_star => wrk_2d_23 ! turbulent scale of tem. fluct.
781	USE wrk_nemo, ONLY: q_star => wrk_2d_24 ! turbulent humidity of temp. fluct.
782	USE wrk_nemo, ONLY: U_star => wrk_2d_25 ! turb. scale of velocity fluct.
783	USE wrk_nemo, ONLY: L => wrk_2d_26 ! Monin-Obukov length [m]
784	USE wrk_nemo, ONLY: zeta_u => wrk_2d_27 ! stability parameter at height zu
785	USE wrk_nemo, ONLY: zeta_t => wrk_2d_28 ! stability parameter at height zt
786	USE wrk_nemo, ONLY: U_n10 => wrk_2d_29 ! neutral wind velocity at 10m [m]
787	USE wrk_nemo, ONLY: xlogt => wrk_2d_30, xct => wrk_2d_31, zpsi_hu => wrk_2d_32, zpsi_ht => wrk_2d_33, zpsi_m => wrk_2d_34
788	USE wrk_nemo, ONLY: stab => iwrk_2d_1 ! 1st guess stability test integer
789	!!
790	REAL(wp), INTENT(in) :: &
791	zt, & ! height for T_zt and q_zt [m]
792	zu ! height for dU [m]
793	REAL(wp), INTENT(in), DIMENSION(jpi,jpj) :: &
794	sst, & ! sea surface temperature [Kelvin]
795	T_zt, & ! potential air temperature [Kelvin]
796	q_sat, & ! sea surface specific humidity [kg/kg]
797	q_zt, & ! specific air humidity [kg/kg]
798	dU ! relative wind module \|U(zu)-U(0)\| [m/s]
799	REAL(wp), INTENT(out), DIMENSION(jpi,jpj) :: &
800	Cd, & ! transfer coefficient for momentum (tau)
801	Ch, & ! transfer coefficient for sensible heat (Q_sens)
802	Ce, & ! transfert coefficient for evaporation (Q_lat)
803	T_zu, & ! air temp. shifted at zu [K]
804	q_zu ! spec. hum. shifted at zu [kg/kg]
805
806	INTEGER :: j_itt
807	INTEGER, PARAMETER :: nb_itt = 3 ! number of itterations
808	REAL(wp), PARAMETER :: &
809	grav = 9.8, & ! gravity
810	kappa = 0.4 ! von Karman's constant
811	!!----------------------------------------------------------------------
812	!! * Start
813
814	IF( wrk_in_use(2, 14,15,16,17,18,19, &
815	20,21,22,23,24,25,26,27,28,29, &
816	30,31,32,33,34) .OR. &
817	iwrk_in_use(2, 1) ) THEN
818	CALL ctl_stop('TURB_CORE_2Z: requested workspace arrays unavailable') ; RETURN
819	ENDIF
820
821	!! Initial air/sea differences
822	dU10 = max(0.5, dU) ! we don't want to fall under 0.5 m/s
823	dT = T_zt - sst
824	dq = q_zt - q_sat
825
826	!! Neutral Drag Coefficient :
827	stab = 0.5 + sign(0.5,dT) ! stab = 1 if dT > 0 -> STABLE
828	Cd_n10 = 1E-3*( 2.7/dU10 + 0.142 + dU10/13.09 )
829	sqrt_Cd_n10 = sqrt(Cd_n10)
830	Ce_n10 = 1E-3( 34.6 sqrt_Cd_n10 )
831	Ch_n10 = 1E-3sqrt_Cd_n10(18stab + 32.7(1 - stab))
832
833	!! Initializing transf. coeff. with their first guess neutral equivalents :
834	Cd = Cd_n10 ; Ce = Ce_n10 ; Ch = Ch_n10 ; sqrt_Cd = sqrt(Cd)
835
836	!! Initializing z_u values with z_t values :
837	T_zu = T_zt ; q_zu = q_zt
838
839	!! * Now starting iteration loop
840	DO j_itt=1, nb_itt
841	dT = T_zu - sst ; dq = q_zu - q_sat ! Updating air/sea differences
842	T_vpot = T_zu(1. + 0.608q_zu) ! Updating virtual potential temperature at zu
843	U_star = sqrt_Cd*dU10 ! Updating turbulent scales : (L & Y eq. (7))
844	T_star = Ch/sqrt_Cd*dT !
845	q_star = Ce/sqrt_Cd*dq !
846	!!
847	L = (U_star*U_star) & ! Estimate the Monin-Obukov length at height zu
848	& / (kappagrav/T_vpot(T_star(1.+0.608q_zu) + 0.608T_zuq_star))
849	!! Stability parameters :
850	zeta_u = zu/L ; zeta_u = sign( min(abs(zeta_u),10.0), zeta_u )
851	zeta_t = zt/L ; zeta_t = sign( min(abs(zeta_t),10.0), zeta_t )
852	zpsi_hu = psi_h(zeta_u)
853	zpsi_ht = psi_h(zeta_t)
854	zpsi_m = psi_m(zeta_u)
855	!!
856	!! Shifting the wind speed to 10m and neutral stability : (L & Y eq.(9a))
857	! U_n10 = dU10/(1. + sqrt_Cd_n10/kappa*(log(zu/10.) - psi_m(zeta_u)))
858	U_n10 = dU10/(1. + sqrt_Cd_n10/kappa*(log(zu/10.) - zpsi_m))
859	!!
860	!! Shifting temperature and humidity at zu : (L & Y eq. (9b-9c))
861	! T_zu = T_zt - T_star/kappa*(log(zt/zu) + psi_h(zeta_u) - psi_h(zeta_t))
862	T_zu = T_zt - T_star/kappa*(log(zt/zu) + zpsi_hu - zpsi_ht)
863	! q_zu = q_zt - q_star/kappa*(log(zt/zu) + psi_h(zeta_u) - psi_h(zeta_t))
864	q_zu = q_zt - q_star/kappa*(log(zt/zu) + zpsi_hu - zpsi_ht)
865	!!
866	!! q_zu cannot have a negative value : forcing 0
867	stab = 0.5 + sign(0.5,q_zu) ; q_zu = stab*q_zu
868	!!
869	!! Updating the neutral 10m transfer coefficients :
870	Cd_n10 = 1E-3 * (2.7/U_n10 + 0.142 + U_n10/13.09) ! L & Y eq. (6a)
871	sqrt_Cd_n10 = sqrt(Cd_n10)
872	Ce_n10 = 1E-3 * (34.6 * sqrt_Cd_n10) ! L & Y eq. (6b)
873	stab = 0.5 + sign(0.5,zeta_u)
874	Ch_n10 = 1E-3sqrt_Cd_n10(18.stab + 32.7(1-stab)) ! L & Y eq. (6c-6d)
875	!!
876	!!
877	!! Shifting the neutral 10m transfer coefficients to (zu,zeta_u) :
878	! xct = 1. + sqrt_Cd_n10/kappa*(log(zu/10.) - psi_m(zeta_u))
879	xct = 1. + sqrt_Cd_n10/kappa*(log(zu/10.) - zpsi_m)
880	Cd = Cd_n10/(xct*xct) ; sqrt_Cd = sqrt(Cd)
881	!!
882	! xlogt = log(zu/10.) - psi_h(zeta_u)
883	xlogt = log(zu/10.) - zpsi_hu
884	!!
885	xct = 1. + Ch_n10*xlogt/kappa/sqrt_Cd_n10
886	Ch = Ch_n10*sqrt_Cd/sqrt_Cd_n10/xct
887	!!
888	xct = 1. + Ce_n10*xlogt/kappa/sqrt_Cd_n10
889	Ce = Ce_n10*sqrt_Cd/sqrt_Cd_n10/xct
890	!!
891	!!
892	END DO
893	!!
894	IF( wrk_not_released(2, 14,15,16,17,18,19, &
895	& 20,21,22,23,24,25,26,27,28,29, &
896	& 30,31,32,33,34 ) .OR. &
897	iwrk_not_released(2, 1) ) &
898	CALL ctl_stop('TURB_CORE_2Z: failed to release workspace arrays')
899	!
900	END SUBROUTINE TURB_CORE_2Z
901
902
903	FUNCTION psi_m(zta) !! Psis, L & Y eq. (8c), (8d), (8e)
904	!-------------------------------------------------------------------------------
905	USE wrk_nemo, ONLY: wrk_in_use, wrk_not_released
906	USE wrk_nemo, ONLY: X2 => wrk_2d_35
907	USE wrk_nemo, ONLY: X => wrk_2d_36
908	USE wrk_nemo, ONLY: stabit => wrk_2d_37
909	!!
910	REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: zta
911
912	REAL(wp), PARAMETER :: pi = 3.141592653589793_wp
913	REAL(wp), DIMENSION(jpi,jpj) :: psi_m
914	!-------------------------------------------------------------------------------
915
916	IF( wrk_in_use(2, 35,36,37) ) THEN
917	CALL ctl_stop('psi_m: requested workspace arrays unavailable') ; RETURN
918	ENDIF
919
920	X2 = sqrt(abs(1. - 16.*zta)) ; X2 = max(X2 , 1.0) ; X = sqrt(X2)
921	stabit = 0.5 + sign(0.5,zta)
922	psi_m = -5.ztastabit & ! Stable
923	& + (1. - stabit)(2log((1. + X)/2) + log((1. + X2)/2) - 2*atan(X) + pi/2) ! Unstable
924
925	IF( wrk_not_released(2, 35,36,37) ) CALL ctl_stop('psi_m: failed to release workspace arrays')
926	!
927	END FUNCTION psi_m
928
929
930	FUNCTION psi_h( zta ) !! Psis, L & Y eq. (8c), (8d), (8e)
931	!-------------------------------------------------------------------------------
932	USE wrk_nemo, ONLY: wrk_in_use, wrk_not_released
933	USE wrk_nemo, ONLY: X2 => wrk_2d_35
934	USE wrk_nemo, ONLY: X => wrk_2d_36
935	USE wrk_nemo, ONLY: stabit => wrk_2d_37
936	!
937	REAL(wp), DIMENSION(jpi,jpj), INTENT(in) :: zta
938	!
939	REAL(wp), DIMENSION(jpi,jpj) :: psi_h
940	!-------------------------------------------------------------------------------
941
942	IF( wrk_in_use(2, 35,36,37) ) THEN
943	CALL ctl_stop('psi_h: requested workspace arrays unavailable') ; RETURN
944	ENDIF
945
946	X2 = sqrt(abs(1. - 16.*zta)) ; X2 = max(X2 , 1.) ; X = sqrt(X2)
947	stabit = 0.5 + sign(0.5,zta)
948	psi_h = -5.ztastabit & ! Stable
949	& + (1. - stabit)(2.log( (1. + X2)/2. )) ! Unstable
950
951	IF( wrk_not_released(2, 35,36,37) ) CALL ctl_stop('psi_h: failed to release workspace arrays')
952	!
953	END FUNCTION psi_h
954
955	!!======================================================================
956	END MODULE sbcblk_core

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

Download in other formats: