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coare30_flux_cnrm_mod.F90 @ 5144

Last change on this file since 5144 was 5144, checked in by abarral, 3 months ago
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1	!SFX_LIC Copyright 1994-2014 CNRS, Meteo-France and Universite Paul Sabatier
2	!SFX_LIC This is part of the SURFEX software governed by the CeCILL-C licence
3	!SFX_LIC version 1. See LICENSE, CeCILL-C_V1-en.txt and CeCILL-C_V1-fr.txt
4	!SFX_LIC for details. version 1.
5	! #########
6
7	module coare30_flux_cnrm_mod
8	IMPLICIT NONE
9	PRIVATE
10	public COARE30_FLUX_CNRM
11
12	CONTAINS
13
14
15	SUBROUTINE COARE30_FLUX_CNRM(PZ0SEA, PTA, PSST, PQA, &
16	PVMOD, PZREF, PUREF, PPS, PQSATA, PQSAT, PSFTH, PSFTQ, PUSTAR, PCD, PCDN, PCH, PCE, PRI, &
17	PRESA, PRAIN, PPA, PZ0HSEA, LPRECIP, LPWG, coeffs)
18	! #######################################################################
19
20
21	!!**** COARE25_FLUX
22	!!
23	!! PURPOSE
24	!! -------
25	! Calculate the surface fluxes of heat, moisture, and momentum over
26	! sea surface with bulk algorithm COARE3.0.
27
28	!!** METHOD
29	!! ------
30	! transfer coefficients were obtained using a dataset which combined COARE
31	! data with those from three other ETL field experiments, and reanalysis of
32	! the HEXMAX data (DeCosmos et al. 1996).
33	! ITERMAX=3
34	! Take account of the surface gravity waves on the velocity roughness and
35	! hence the momentum transfer coefficient
36	! NGRVWAVES=0 no gravity waves action (Charnock) !default value
37	! NGRVWAVES=1 wave age parameterization of Oost et al. 2002
38	! NGRVWAVES=2 model of Taylor and Yelland 2001
39
40	!! EXTERNAL
41	!! --------
42	!!
43	!! IMPLICIT ARGUMENTS
44	!! ------------------
45	!!
46	!! REFERENCE
47	!! ---------
48	!! Fairall et al (2003), J. of Climate, vol. 16, 571-591
49	!! Fairall et al (1996), JGR, 3747-3764
50	!! Gosnell et al (1995), JGR, 437-442
51	!! Fairall et al (1996), JGR, 1295-1308
52	!!
53	!! AUTHOR
54	!! ------
55	!! C. Lebeaupin Météo-France (adapted from C. Fairall's code)
56	!!
57	!! MODIFICATIONS
58	!! -------------
59	!! Original 1/06/2006
60	!! B. Decharme 06/2009 limitation of Ri
61	!! B. Decharme 09/2012 Bug in Ri calculation and limitation of Ri in surface_ri.F90
62	!! B. Decharme 06/2013 bug in z0 (output) computation
63	!! J.Escobar 06/2013 for REAL4/8 add EPSILON management
64	!! C. Lebeaupin 03/2014 bug if PTA=PSST and PEXNA=PEXNS: set a minimum value
65	!! add abort if no convergence
66	!-------------------------------------------------------------------------------
67
68	!* 0. DECLARATIONS
69	! ------------
70
71
72	!USE MODD_SEAFLUX_n, ONLY: SEAFLUX_t
73
74	!----------Rajout Olive ---------
75	USE dimphy
76	USE indice_sol_mod
77	USE coare_cp_mod, ONLY: PSIFCTT => psit_30, PSIFCTU => psiuo
78
79	!--------------------------------
80
81	USE MODD_CSTS, ONLY: XKARMAN, XG, XSTEFAN, XRD, XRV, XPI, &
82	XLVTT, XCL, XCPD, XCPV, XRHOLW, XTT, &
83	XP00
84	USE lmdz_abort_physic, ONLY: abort_physic
85	USE lmdz_clesphys
86	USE lmdz_yomcst
87
88	!USE MODD_SURF_ATM, ONLY: XVZ0CM
89
90	!USE MODD_SURF_PAR, ONLY: XUNDEF, XSURF_EPSILON
91	!USE MODD_WATER_PAR
92
93	!USE MODI_SURFACE_RI
94	!USE MODI_WIND_THRESHOLD
95	!USE MODE_COARE30_PSI
96
97	!USE MODE_THERMOS
98
99	!USE MODI_ABOR1_SFX
100
101	!USE YOMHOOK ,ONLY: LHOOK, DR_HOOK
102	!USE PARKIND1 ,ONLY: JPRB
103
104	IMPLICIT NONE
105
106	!* 0.1 declarations of arguments
107
108
109
110	!TYPE(SEAFLUX_t), INTENT(INOUT) :: S
111
112	REAL, DIMENSION(klon), INTENT(IN) :: PTA ! air temperature at atm. level (K)
113	REAL, DIMENSION(klon), INTENT(IN) :: PQA ! air humidity at atm. level (kg/kg)
114	!REAL, DIMENSION(:), INTENT(IN) :: PEXNA ! Exner function at atm. level
115	!REAL, DIMENSION(:), INTENT(IN) :: PRHOA ! air density at atm. level
116	REAL, DIMENSION(klon), INTENT(IN) :: PVMOD ! module of wind at atm. wind level (m/s)
117	REAL, DIMENSION(klon), INTENT(IN) :: PZREF ! atm. level for temp. and humidity (m)
118	REAL, DIMENSION(klon), INTENT(IN) :: PUREF ! atm. level for wind (m)
119	REAL, DIMENSION(klon), INTENT(IN) :: PSST ! Sea Surface Temperature (K)
120	!REAL, DIMENSION(:), INTENT(IN) :: PEXNS ! Exner function at sea surface
121	REAL, DIMENSION(klon), INTENT(IN) :: PPS ! air pressure at sea surface (Pa)
122	REAL, DIMENSION(klon), INTENT(IN) :: PRAIN !precipitation rate (kg/s/m2)
123	REAL, DIMENSION(klon), INTENT(IN) :: PPA ! air pressure at atm level (Pa)
124	REAL, DIMENSION(klon), INTENT(IN) :: PQSATA ! air pressure at atm level (Pa)
125
126	REAL, DIMENSION(klon), INTENT(INOUT) :: PZ0SEA! roughness length over the ocean
127
128	! surface fluxes : latent heat, sensible heat, friction fluxes
129	REAL, DIMENSION(klon), INTENT(OUT) :: PSFTH ! heat flux (W/m2)
130	REAL, DIMENSION(klon), INTENT(OUT) :: PSFTQ ! water flux (kg/m2/s)
131	REAL, DIMENSION(klon), INTENT(OUT) :: PUSTAR! friction velocity (m/s)
132
133	! diagnostics
134	REAL, DIMENSION(klon), INTENT(OUT) :: PQSAT ! humidity at saturation
135	REAL, DIMENSION(klon), INTENT(OUT) :: PCD ! heat drag coefficient
136	REAL, DIMENSION(klon), INTENT(OUT) :: PCDN ! momentum drag coefficient
137	REAL, DIMENSION(klon), INTENT(OUT) :: PCH ! neutral momentum drag coefficient
138	REAL, DIMENSION(klon), INTENT(OUT) :: PCE !transfer coef. for latent heat flux
139	REAL, DIMENSION(klon), INTENT(OUT) :: PRI ! Richardson number
140	REAL, DIMENSION(klon), INTENT(OUT) :: PRESA ! aerodynamical resistance
141	REAL, DIMENSION(klon), INTENT(OUT) :: PZ0HSEA ! heat roughness length
142
143	LOGICAL, INTENT(IN) :: LPRECIP !
144	LOGICAL, INTENT(IN) :: LPWG !
145	REAL, DIMENSION(3), INTENT(INOUT) :: coeffs
146
147
148	!* 0.2 declarations of local variables
149
150	REAL, DIMENSION(SIZE(PTA)) :: ZVMOD ! wind intensity
151	REAL, DIMENSION(SIZE(PTA)) :: ZPA ! Pressure at atm. level
152	REAL, DIMENSION(SIZE(PTA)) :: ZTA ! Temperature at atm. level
153	REAL, DIMENSION(SIZE(PTA)) :: ZQASAT ! specific humidity at saturation at atm. level (kg/kg)
154
155	!rajout
156	REAL, DIMENSION(SIZE(PTA)) :: PEXNA ! Exner function at atm level
157	REAL, DIMENSION(SIZE(PTA)) :: PEXNS ! Exner function at atm level
158
159	REAL, DIMENSION(SIZE(PTA)) :: ZO ! rougness length ref
160	REAL, DIMENSION(SIZE(PTA)) :: ZWG ! gustiness factor (m/s)
161
162	REAL, DIMENSION(SIZE(PTA)) :: ZDU, ZDT, ZDQ, ZDUWG !differences
163
164	REAL, DIMENSION(SIZE(PTA)) :: ZUSR !velocity scaling parameter "ustar" (m/s) = friction velocity
165	REAL, DIMENSION(SIZE(PTA)) :: ZTSR !temperature sacling parameter "tstar" (degC)
166	REAL, DIMENSION(SIZE(PTA)) :: ZQSR !humidity scaling parameter "qstar" (kg/kg)
167
168	REAL, DIMENSION(SIZE(PTA)) :: ZU10, ZT10 !vertical profils (10-m height)
169	REAL, DIMENSION(SIZE(PTA)) :: ZVISA !kinematic viscosity of dry air
170	REAL, DIMENSION(SIZE(PTA)) :: ZO10, ZOT10 !roughness length at 10m
171	REAL, DIMENSION(SIZE(PTA)) :: ZCD, ZCT, ZCC
172	REAL, DIMENSION(SIZE(PTA)) :: ZCD10, ZCT10 !transfer coef. at 10m
173	REAL, DIMENSION(SIZE(PTA)) :: ZRIBU, ZRIBCU
174	REAL, DIMENSION(SIZE(PTA)) :: ZETU, ZL10
175
176	REAL, DIMENSION(SIZE(PTA)) :: ZCHARN !Charnock number depends on wind module
177	REAL, DIMENSION(SIZE(PTA)) :: ZTWAVE, ZHWAVE, ZCWAVE, ZLWAVE !to compute gravity waves' impact
178
179	REAL, DIMENSION(SIZE(PTA)) :: ZZL, ZZTL!,ZZQL !Obukhovs stability
180	!param. z/l for u,T,q
181	REAL, DIMENSION(SIZE(PTA)) :: ZRR
182	REAL, DIMENSION(SIZE(PTA)) :: ZOT, ZOQ !rougness length ref
183	REAL, DIMENSION(SIZE(PTA)) :: ZPUZ, ZPTZ, ZPQZ !PHI funct. for u,T,q
184
185	REAL, DIMENSION(SIZE(PTA)) :: ZBF !constants to compute gustiness factor
186
187	REAL, DIMENSION(SIZE(PTA)) :: ZTAU !momentum flux (W/m2)
188	REAL, DIMENSION(SIZE(PTA)) :: ZHF !sensible heat flux (W/m2)
189	REAL, DIMENSION(SIZE(PTA)) :: ZEF !latent heat flux (W/m2)
190	REAL, DIMENSION(SIZE(PTA)) :: ZWBAR !diag for webb correction but not used here after
191	REAL, DIMENSION(SIZE(PTA)) :: ZTAUR !momentum flux due to rain (W/m2)
192	REAL, DIMENSION(SIZE(PTA)) :: ZRF !sensible heat flux due to rain (W/m2)
193	REAL, DIMENSION(SIZE(PTA)) :: ZCHN, ZCEN !neutral coef. for heat and vapor
194
195	REAL, DIMENSION(SIZE(PTA)) :: ZLV !latent heat constant
196
197	REAL, DIMENSION(SIZE(PTA)) :: ZTAC, ZDQSDT, ZDTMP, ZDWAT, ZALFAC ! for precipitation impact
198	REAL, DIMENSION(SIZE(PTA)) :: ZXLR ! vaporisation heat at a given temperature
199	REAL, DIMENSION(SIZE(PTA)) :: ZCPLW ! specific heat for water at a given temperature
200
201	REAL, DIMENSION(SIZE(PTA)) :: ZUSTAR2 ! square of friction velocity
202
203	REAL, DIMENSION(SIZE(PTA)) :: ZDIRCOSZW! orography slope cosine (=1 on water!)
204	REAL, DIMENSION(SIZE(PTA)) :: ZAC ! Aerodynamical conductance
205
206	INTEGER, DIMENSION(SIZE(PTA)) :: ITERMAX ! maximum number of iterations
207
208	REAL :: ZRVSRDM1, ZRDSRV, ZR2 ! thermodynamic constants
209	REAL :: ZBETAGUST !gustiness factor
210	REAL :: ZZBL !atm. boundary layer depth (m)
211	REAL :: ZVISW !m2/s kinematic viscosity of water
212	REAL :: ZS !height of rougness length ref
213	REAL :: ZCH10 !transfer coef. at 10m
214
215	REAL :: QSAT_SEAWATER
216	REAL :: QSATSEAW_1D
217
218	INTEGER :: J, JLOOP !loop indice
219	!REAL(KIND=JPRB) :: ZHOOK_HANDLE
220
221	!--------- Modif Olive -----------------
222	REAL, DIMENSION(SIZE(PTA)) :: PRHOA
223	REAL, PARAMETER :: XUNDEF = 1.E+20
224
225	REAL :: XVCHRNK = 0.021
226	REAL :: XVZ0CM = 1.0E-5
227	!REAL :: XRIMAX
228
229	INTEGER :: PREF ! reference pressure for exner function
230	INTEGER :: NGRVWAVES ! Pour le choix du z0
231
232	!--------------------------------------
233
234	PRHOA(:) = PPS(:) / (287.1 * PTA(:) * (1. + .61 * PQA(:)))
235
236	PREF = 100000. ! = 1000 hPa
237	NGRVWAVES = 1
238
239	PEXNA = (PPA / PREF)**(RD / RCPD)
240	PEXNS = (PPS / PREF)**(RD / RCPD)
241
242	!-------------------------------------------------------------------------------
243
244	! 1. Initializations
245	! ---------------
246
247	! 1.1 Constants and parameters
248
249	!IF (LHOOK) CALL DR_HOOK('COARE30_FLUX',0,ZHOOK_HANDLE)
250
251	ZRVSRDM1 = XRV / XRD - 1. ! 0.607766
252	ZRDSRV = XRD / XRV ! 0.62198
253	ZR2 = 1. - ZRDSRV ! pas utilisé dans cette routine
254	ZBETAGUST = 1.2 ! value based on TOGA-COARE experiment
255	ZZBL = 600. ! Set a default value for boundary layer depth
256	ZS = 10. ! Standard heigth =10m
257	ZCH10 = 0.00115
258
259	ZVISW = 1.E-6
260
261	! 1.2 Array initialization by undefined values
262
263	PSFTH (:) = XUNDEF
264	PSFTQ (:) = XUNDEF
265	PUSTAR(:) = XUNDEF
266
267	PCD(:) = XUNDEF
268	PCDN(:) = XUNDEF
269	PCH(:) = XUNDEF
270	PCE(:) = XUNDEF
271	PRI(:) = XUNDEF
272
273	PRESA(:) = XUNDEF
274
275	!-------------------------------------------------------------------------------
276	! 2. INITIAL GUESS FOR THE ITERATIVE METHOD
277	! -------------------------------------
278
279	! 2.0 Temperature
280
281	! Set a non-zero value for the temperature gradient
282
283	WHERE((PTA(:) * PEXNS(:) / PEXNA(:) - PSST(:))==0.)
284	ZTA(:) = PTA(:) - 1E-3
285	ELSEWHERE
286	ZTA(:) = PTA(:)
287	ENDWHERE
288
289	! 2.1 Wind and humidity
290
291	! Sea surface specific humidity
292
293	!PQSAT(:)=QSAT_SEAWATER(PSST(:),PPS(:))
294	PQSAT(:) = QSATSEAW_1D(PSST(:), PPS(:))
295
296	! Set a minimum value to wind
297
298	!ZVMOD(:) = WIND_THRESHOLD(PVMOD(:),PUREF(:))
299
300	ZVMOD = MAX(PVMOD, 0.1 * MIN(10., PUREF)) !set a minimum value to wind
301	!ZVMOD = PVMOD !set a minimum value to wind
302
303	! Specific humidity at saturation at the atm. level
304
305	ZPA(:) = XP00 * (PEXNA(:)**(XCPD / XRD))
306	!ZQASAT(:) = QSAT_SEAWATER(ZTA(:),ZPA(:))
307	ZQASAT = QSATSEAW_1D(ZTA(:), ZPA(:))
308
309	ZO(:) = 0.0001
310	ZWG(:) = 0.
311	IF (LPWG) ZWG(:) = 0.5
312
313	ZCHARN(:) = 0.011
314
315	DO J = 1, SIZE(PTA)
316
317	! 2.2 initial guess
318
319	ZDU(J) = ZVMOD(J) !wind speed difference with surface current(=0) (m/s)
320	!initial guess for gustiness factor
321	ZDT(J) = -(ZTA(J) / PEXNA(J)) + (PSST(J) / PEXNS(J)) !potential temperature difference
322	ZDQ(J) = PQSAT(J) - PQA(J) !specific humidity difference
323
324	ZDUWG(J) = SQRT(ZDU(J)2 + ZWG(J)2) !wind speed difference including gustiness ZWG
325
326	! 2.3 initialization of neutral coefficients
327
328	ZU10(J) = ZDUWG(J) * LOG(ZS / ZO(J)) / LOG(PUREF(J) / ZO(J))
329	ZUSR(J) = 0.035 * ZU10(J)
330	ZVISA(J) = 1.326E-5 * (1. + 6.542E-3 * (ZTA(J) - XTT) + &
331	8.301E-6 * (ZTA(J) - XTT)*2 - 4.84E-9 (ZTA(J) - XTT)**3) !Andrea (1989) CRREL Rep. 89-11
332
333	ZO10(J) = ZCHARN(J) * ZUSR(J) * ZUSR(J) / XG + 0.11 * ZVISA(J) / ZUSR(J)
334	ZCD(J) = (XKARMAN / LOG(PUREF(J) / ZO10(J)))**2 !drag coefficient
335	ZCD10(J) = (XKARMAN / LOG(ZS / ZO10(J)))**2
336	ZCT10(J) = ZCH10 / SQRT(ZCD10(J))
337	ZOT10(J) = ZS / EXP(XKARMAN / ZCT10(J))
338
339	!-------------------------------------------------------------------------------
340	! Grachev and Fairall (JAM, 1997)
341	ZCT(J) = XKARMAN / LOG(PZREF(J) / ZOT10(J)) !temperature transfer coefficient
342	ZCC(J) = XKARMAN * ZCT(J) / ZCD(J) !z/L vs Rib linear coef.
343
344	ZRIBCU(J) = -PUREF(J) / (ZZBL * 0.004 * ZBETAGUST**3) !saturation or plateau Rib
345	!ZRIBU(J) =-XGPUREF(J)(ZDT(J)+ZRVSRDM1(ZTA(J)-XTT)ZDQ)/&
346	! &((ZTA(J)-XTT)ZDUWG(J)*2)
347	ZRIBU(J) = -XG * PUREF(J) * (ZDT(J) + ZRVSRDM1 * ZTA(J) * ZDQ(J)) / &
348	(ZTA(J) * ZDUWG(J)**2)
349
350	IF (ZRIBU(J)<0.) THEN
351	ZETU(J) = ZCC(J) * ZRIBU(J) / (1. + ZRIBU(J) / ZRIBCU(J)) !Unstable G and F
352	ELSE
353	ZETU(J) = ZCC(J) * ZRIBU(J) / (1. + 27. / 9. * ZRIBU(J) / ZCC(J))!Stable
354	ENDIF
355
356	ZL10(J) = PUREF(J) / ZETU(J) !MO length
357
358	ENDDO
359
360	! First guess M-O stability dependent scaling params. (u,T,q*) to estimate ZO and z/L (ZZL)
361	ZUSR(:) = ZDUWG(:) * XKARMAN / (LOG(PUREF(:) / ZO10(:)) - PSIFCTU(PUREF(1) / ZL10(1)))
362	ZTSR(:) = -ZDT(:) * XKARMAN / (LOG(PZREF(:) / ZOT10(:)) - PSIFCTT(PZREF(1) / ZL10(1)))
363	ZQSR(:) = -ZDQ(:) * XKARMAN / (LOG(PZREF(:) / ZOT10(:)) - PSIFCTT(PZREF(1) / ZL10(1)))
364
365	ZZL(:) = 0.0
366
367	DO J = 1, SIZE(PTA)
368
369	IF (ZETU(J)>50.) THEN
370	ITERMAX(J) = 1
371	ELSE
372	ITERMAX(J) = 3 !number of iterations
373	ENDIF
374
375	!then modify Charnork for high wind speeds Chris Fairall's data
376	IF (ZDUWG(J)>10.) ZCHARN(J) = 0.011 + (0.018 - 0.011) * (ZDUWG(J) - 10.) / (18. - 10.)
377	IF (ZDUWG(J)>18.) ZCHARN(J) = 0.018
378
379	! 3. ITERATIVE LOOP TO COMPUTE USR, TSR, QSR
380	! -------------------------------------------
381
382	ZHWAVE(J) = 0.018 * ZVMOD(J) * ZVMOD(J) * (1. + 0.015 * ZVMOD(J))
383	ZTWAVE(J) = 0.729 * ZVMOD(J)
384	ZCWAVE(J) = XG * ZTWAVE(J) / (2. * XPI)
385	ZLWAVE(J) = ZTWAVE(J) * ZCWAVE(J)
386
387	ENDDO
388
389	DO JLOOP = 1, MAXVAL(ITERMAX) ! begin of iterative loop
390
391	DO J = 1, SIZE(PTA)
392
393	IF (JLOOP>ITERMAX(J)) CYCLE
394
395	IF (NGRVWAVES==0) THEN
396	ZO(J) = ZCHARN(J) * ZUSR(J) * ZUSR(J) / XG + 0.11 * ZVISA(J) / ZUSR(J) !Smith 1988
397	ELSE IF (NGRVWAVES==1) THEN
398	ZO(J) = (50. / (2. * XPI)) * ZLWAVE(J) * (ZUSR(J) / ZCWAVE(J))**4.5 &
399	+ 0.11 * ZVISA(J) / ZUSR(J) !Oost et al. 2002
400	ELSE IF (NGRVWAVES==2) THEN
401	ZO(J) = 1200. * ZHWAVE(J) * (ZHWAVE(J) / ZLWAVE(J))**4.5 &
402	+ 0.11 * ZVISA(J) / ZUSR(J) !Taulor and Yelland 2001
403	ENDIF
404
405	ZRR(J) = ZO(J) * ZUSR(J) / ZVISA(J)
406	ZOQ(J) = MIN(1.15E-4, 5.5E-5 / ZRR(J)**0.6)
407	ZOT(J) = ZOQ(J)
408
409	ZZL(J) = XKARMAN * XG * PUREF(J) * &
410	(ZTSR(J) * (1. + ZRVSRDM1 * PQA(J)) + ZRVSRDM1 * ZTA(J) * ZQSR(J)) / &
411	(ZTA(J) * ZUSR(J) * ZUSR(J) * (1. + ZRVSRDM1 * PQA(J)))
412	ZZTL(J) = ZZL(J) * PZREF(J) / PUREF(J) ! for T
413	! ZZQL(J)=ZZL(J)*PZREF(J)/PUREF(J) ! for Q
414	ENDDO
415
416	ZPUZ(:) = PSIFCTU(ZZL(1))
417	ZPTZ(:) = PSIFCTT(ZZTL(1))
418
419	DO J = 1, SIZE(PTA)
420
421	! ZPQZ(J)=PSIFCTT(ZZQL(J))
422	ZPQZ(J) = ZPTZ(J)
423
424	! 3.1 scale parameters
425
426	ZUSR(J) = ZDUWG(J) * XKARMAN / (LOG(PUREF(J) / ZO(J)) - ZPUZ(J))
427	ZTSR(J) = -ZDT(J) * XKARMAN / (LOG(PZREF(J) / ZOT(J)) - ZPTZ(J))
428	ZQSR(J) = -ZDQ(J) * XKARMAN / (LOG(PZREF(J) / ZOQ(J)) - ZPQZ(J))
429
430	! 3.2 Gustiness factor (ZWG)
431
432	IF(LPWG) THEN
433	ZBF(J) = -XG / ZTA(J) * ZUSR(J) * (ZTSR(J) + ZRVSRDM1 * ZTA(J) * ZQSR(J))
434	IF (ZBF(J)>0.) THEN
435	ZWG(J) = ZBETAGUST * (ZBF(J) * ZZBL)**(1. / 3.)
436	ELSE
437	ZWG(J) = 0.2
438	ENDIF
439	ENDIF
440	ZDUWG(J) = SQRT(ZVMOD(J)2 + ZWG(J)2)
441
442	ENDDO
443
444	ENDDO
445	!-------------------------------------------------------------------------------
446
447	! 4. COMPUTE transfer coefficients PCD, PCH, ZCE and SURFACE FLUXES
448	! --------------------------------------------------------------
449
450	ZTAU(:) = XUNDEF
451	ZHF(:) = XUNDEF
452	ZEF(:) = XUNDEF
453
454	ZWBAR(:) = 0.
455	ZTAUR(:) = 0.
456	ZRF(:) = 0.
457
458	DO J = 1, SIZE(PTA)
459
460
461	! 4. transfert coefficients PCD, PCH and PCE
462	! and neutral PCDN, ZCHN, ZCEN
463
464	PCD(J) = (ZUSR(J) / ZDUWG(J))**2.
465	PCH(J) = ZUSR(J) * ZTSR(J) / (ZDUWG(J) * (ZTA(J) * PEXNS(J) / PEXNA(J) - PSST(J)))
466	PCE(J) = ZUSR(J) * ZQSR(J) / (ZDUWG(J) * (PQA(J) - PQSAT(J)))
467
468	PCDN(J) = (XKARMAN / LOG(ZS / ZO(J)))**2.
469	ZCHN(J) = (XKARMAN / LOG(ZS / ZO(J))) * (XKARMAN / LOG(ZS / ZOT(J)))
470	ZCEN(J) = (XKARMAN / LOG(ZS / ZO(J))) * (XKARMAN / LOG(ZS / ZOQ(J)))
471
472	ZLV(J) = XLVTT + (XCPV - XCL) * (PSST(J) - XTT)
473
474	! 4. 2 surface fluxes
475
476	IF (ABS(PCDN(J))>1.E-2) THEN !!!! secure COARE3.0 CODE
477	WRITE(, ) 'pb PCDN in COARE30: ', PCDN(J)
478	WRITE(, ) 'point: ', J, "/", SIZE(PTA)
479	WRITE(, ) 'roughness: ', ZO(J)
480	WRITE(, ) 'ustar: ', ZUSR(J)
481	WRITE(, ) 'wind: ', ZDUWG(J)
482	CALL abort_physic('COARE30', ': PCDN too large -> no convergence', 1)
483	ELSE
484	ZTSR(J) = -ZTSR(J)
485	ZQSR(J) = -ZQSR(J)
486	ZTAU(J) = -PRHOA(J) * ZUSR(J) * ZUSR(J) * ZVMOD(J) / ZDUWG(J)
487	ZHF(J) = PRHOA(J) * XCPD * ZUSR(J) * ZTSR(J)
488	ZEF(J) = PRHOA(J) * ZLV(J) * ZUSR(J) * ZQSR(J)
489
490	! 4.3 Contributions to surface fluxes due to rainfall
491
492	! SB: a priori, le facteur ZRDSRV=XRD/XRV est introduit pour
493	! adapter la formule de Clausius-Clapeyron (pour l'air
494	! sec) au cas humide.
495	IF (LPRECIP) THEN
496
497	! heat surface fluxes
498
499	ZTAC(J) = ZTA(J) - XTT
500
501	ZXLR(J) = XLVTT + (XCPV - XCL) * ZTAC(J) ! latent heat of rain vaporization
502	ZDQSDT(J) = ZQASAT(J) * ZXLR(J) / (XRD * ZTA(J)**2) ! Clausius-Clapeyron relation
503	ZDTMP(J) = (1.0 + 3.309e-3 * ZTAC(J) - 1.44e-6 * ZTAC(J) * ZTAC(J)) * & !heat diffusivity
504	0.02411 / (PRHOA(J) * XCPD)
505
506	ZDWAT(J) = 2.11e-5 * (XP00 / ZPA(J)) * (ZTA(J) / XTT)**1.94 ! water vapour diffusivity from eq (13.3)
507	! ! of Pruppacher and Klett (1978)
508	ZALFAC(J) = 1.0 / (1.0 + & ! Eq.11 in GoF95
509	ZRDSRV * ZDQSDT(J) * ZXLR(J) * ZDWAT(J) / (ZDTMP(J) * XCPD)) ! ZALFAC=wet-bulb factor (sans dim)
510	ZCPLW(J) = 4224.8482 + ZTAC(J) * &
511	(-4.707 + ZTAC(J) * &
512	(0.08499 + ZTAC(J) * &
513	(1.2826e-3 + ZTAC(J) * &
514	(4.7884e-5 - 2.0027e-6 * ZTAC(J))))) ! specific heat
515
516	ZRF(J) = PRAIN(J) * ZCPLW(J) * ZALFAC(J) * & !Eq.12 in GoF95 !SIGNE?
517	(PSST(J) - ZTA(J) + (PQSAT(J) - PQA(J)) * ZXLR(J) / XCPD)
518
519	! Momentum flux due to rainfall
520
521	ZTAUR(J) = -0.85 * (PRAIN(J) * ZVMOD(J)) !pp3752 in FBR96
522
523	ENDIF
524
525	! 4.4 Webb correction to latent heat flux
526
527	ZWBAR(J) = - (1. / ZRDSRV) * ZUSR(J) * ZQSR(J) / (1.0 + (1. / ZRDSRV) * PQA(J)) &
528	- ZUSR(J) * ZTSR(J) / ZTA(J) ! Eq.21*rhoa in FBR96
529
530	! 4.5 friction velocity which contains correction du to rain
531
532	ZUSTAR2(J) = - (ZTAU(J) + ZTAUR(J)) / PRHOA(J)
533	PUSTAR(J) = SQRT(ZUSTAR2(J))
534
535	! 4.6 Total surface fluxes
536
537	PSFTH (J) = ZHF(J) + ZRF(J)
538	PSFTQ (J) = ZEF(J) / ZLV(J)
539
540	ENDIF
541	ENDDO
542
543	coeffs = [PCD, &
544	PCE, &
545	PCH]
546
547	!-------------------------------------------------------------------------------
548
549	! 5. FINAL STEP : TOTAL SURFACE FLUXES AND DERIVED DIAGNOSTICS
550	! -----------
551	! 5.1 Richardson number
552
553
554	!------------STOP LA --------------------
555	!ZDIRCOSZW(:) = 1.
556	! CALL SURFACE_RI(PSST,PQSAT,PEXNS,PEXNA,ZTA,ZQASAT,&
557	! PZREF,PUREF,ZDIRCOSZW,PVMOD,PRI )
558	!!
559	!! 5.2 Aerodynamical conductance and resistance
560	!!
561	!ZAC(:) = PCH(:)*ZVMOD(:)
562	!PRESA(:) = 1. / MAX(ZAC(:),XSURF_EPSILON)
563
564	!! 5.3 Z0 and Z0H over sea
565	!!
566	!PZ0SEA(:) = ZCHARN(:) * ZUSTAR2(:) / XG + XVZ0CM * PCD(:) / PCDN(:)
567	!!
568	!!PZ0HSEA(:) = PZ0SEA(:)
569	!!
570	!IF (LHOOK) CALL DR_HOOK('COARE30_FLUX',1,ZHOOK_HANDLE)
571
572	!-------------------------------------------------------------------------------
573
574	END SUBROUTINE COARE30_FLUX_CNRM
575
576	END MODULE coare30_flux_cnrm_mod

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