source: LMDZ6/branches/Amaury_dev/libf/phylmd/coare30_flux_cnrm_mod.F90 @ 5137

Last change on this file since 5137 was 5137, checked in by abarral, 3 months ago

Put gradsdef.h, tracstoke.h, clesphys.h into modules
File size: 19.9 KB
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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
7module coare30_flux_cnrm_mod
8  IMPLICIT NONE
9  PRIVATE
10  public COARE30_FLUX_CNRM
11
12CONTAINS
13
14
15SUBROUTINE 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 ---------
75USE dimphy
76USE indice_sol_mod
77USE coare_cp_mod, ONLY: PSIFCTT=>psit_30, PSIFCTU=>psiuo
78
79!--------------------------------
80
81USE MODD_CSTS,       ONLY: XKARMAN, XG, XSTEFAN, XRD, XRV, XPI, &
82                            XLVTT, XCL, XCPD, XCPV, XRHOLW, XTT, &
83                            XP00
84USE lmdz_abort_physic, ONLY: abort_physic
85USE lmdz_clesphys
86
87!USE MODD_SURF_ATM,   ONLY: XVZ0CM
88
89!USE MODD_SURF_PAR,   ONLY: XUNDEF, XSURF_EPSILON
90!USE MODD_WATER_PAR
91
92!USE MODI_SURFACE_RI
93!USE MODI_WIND_THRESHOLD
94!USE MODE_COARE30_PSI
95
96!USE MODE_THERMOS
97
98
99!USE MODI_ABOR1_SFX
100
101
102!USE YOMHOOK   ,ONLY: LHOOK,   DR_HOOK
103!USE PARKIND1  ,ONLY: JPRB
104
105IMPLICIT NONE
106
107!*      0.1    declarations of arguments
108
109
110
111!TYPE(SEAFLUX_t), INTENT(INOUT) :: S
112
113REAL, DIMENSION(klon), INTENT(IN)       :: PTA   ! air temperature at atm. level (K)
114REAL, DIMENSION(klon), INTENT(IN)       :: PQA   ! air humidity at atm. level (kg/kg)
115!REAL, DIMENSION(:), INTENT(IN)       :: PEXNA ! Exner function at atm. level
116!REAL, DIMENSION(:), INTENT(IN)       :: PRHOA ! air density at atm. level
117REAL, DIMENSION(klon), INTENT(IN)       :: PVMOD ! module of wind at atm. wind level (m/s)
118REAL, DIMENSION(klon), INTENT(IN)       :: PZREF ! atm. level for temp. and humidity (m)
119REAL, DIMENSION(klon), INTENT(IN)       :: PUREF ! atm. level for wind (m)
120REAL, DIMENSION(klon), INTENT(IN)       :: PSST  ! Sea Surface Temperature (K)
121!REAL, DIMENSION(:), INTENT(IN)       :: PEXNS ! Exner function at sea surface
122REAL, DIMENSION(klon), INTENT(IN)       :: PPS   ! air pressure at sea surface (Pa)
123REAL, DIMENSION(klon), INTENT(IN)       :: PRAIN !precipitation rate (kg/s/m2)
124REAL, DIMENSION(klon), INTENT(IN)       :: PPA        ! air pressure at atm level (Pa)
125REAL, DIMENSION(klon), INTENT(IN)       :: PQSATA        ! air pressure at atm level (Pa)
126
127REAL, DIMENSION(klon), INTENT(INOUT)    :: PZ0SEA! roughness length over the ocean
128
129!  surface fluxes : latent heat, sensible heat, friction fluxes
130REAL, DIMENSION(klon), INTENT(OUT)      :: PSFTH ! heat flux (W/m2)
131REAL, DIMENSION(klon), INTENT(OUT)      :: PSFTQ ! water flux (kg/m2/s)
132REAL, DIMENSION(klon), INTENT(OUT)      :: PUSTAR! friction velocity (m/s)
133
134! diagnostics
135REAL, DIMENSION(klon), INTENT(OUT)      :: PQSAT ! humidity at saturation
136REAL, DIMENSION(klon), INTENT(OUT)      :: PCD   ! heat drag coefficient
137REAL, DIMENSION(klon), INTENT(OUT)      :: PCDN  ! momentum drag coefficient
138REAL, DIMENSION(klon), INTENT(OUT)      :: PCH   ! neutral momentum drag coefficient
139REAL, DIMENSION(klon), INTENT(OUT)      :: PCE  !transfer coef. for latent heat flux
140REAL, DIMENSION(klon), INTENT(OUT)      :: PRI   ! Richardson number
141REAL, DIMENSION(klon), INTENT(OUT)      :: PRESA ! aerodynamical resistance
142REAL, DIMENSION(klon), INTENT(OUT)      :: PZ0HSEA ! heat roughness length
143
144LOGICAL,            INTENT(IN)    :: LPRECIP   !
145LOGICAL,            INTENT(IN)    :: LPWG    !
146REAL, DIMENSION(3), INTENT(INOUT)      :: coeffs
147
148
149!*      0.2    declarations of local variables
150
151REAL, DIMENSION(SIZE(PTA))      :: ZVMOD    ! wind intensity
152REAL, DIMENSION(SIZE(PTA))      :: ZPA      ! Pressure at atm. level
153REAL, DIMENSION(SIZE(PTA))      :: ZTA      ! Temperature at atm. level
154REAL, DIMENSION(SIZE(PTA))      :: ZQASAT   ! specific humidity at saturation  at atm. level (kg/kg)
155
156!rajout
157REAL, DIMENSION(SIZE(PTA))       :: PEXNA      ! Exner function at atm level
158REAL, DIMENSION(SIZE(PTA))       :: PEXNS      ! Exner function at atm level
159
160REAL, DIMENSION(SIZE(PTA))      :: ZO       ! rougness length ref
161REAL, DIMENSION(SIZE(PTA))      :: ZWG      ! gustiness factor (m/s)
162
163REAL, DIMENSION(SIZE(PTA))      :: ZDU,ZDT,ZDQ,ZDUWG !differences
164
165REAL, DIMENSION(SIZE(PTA))      :: ZUSR        !velocity scaling parameter "ustar" (m/s) = friction velocity
166REAL, DIMENSION(SIZE(PTA))      :: ZTSR        !temperature sacling parameter "tstar" (degC)
167REAL, DIMENSION(SIZE(PTA))      :: ZQSR        !humidity scaling parameter "qstar" (kg/kg)
168
169REAL, DIMENSION(SIZE(PTA))      :: ZU10,ZT10   !vertical profils (10-m height)
170REAL, DIMENSION(SIZE(PTA))      :: ZVISA       !kinematic viscosity of dry air
171REAL, DIMENSION(SIZE(PTA))      :: ZO10,ZOT10  !roughness length at 10m
172REAL, DIMENSION(SIZE(PTA))      :: ZCD,ZCT,ZCC
173REAL, DIMENSION(SIZE(PTA))      :: ZCD10,ZCT10 !transfer coef. at 10m
174REAL, DIMENSION(SIZE(PTA))      :: ZRIBU,ZRIBCU
175REAL, DIMENSION(SIZE(PTA))      :: ZETU,ZL10
176
177REAL, DIMENSION(SIZE(PTA))      :: ZCHARN                      !Charnock number depends on wind module
178REAL, DIMENSION(SIZE(PTA))      :: ZTWAVE,ZHWAVE,ZCWAVE,ZLWAVE !to compute gravity waves' impact
179
180REAL, DIMENSION(SIZE(PTA))      :: ZZL,ZZTL!,ZZQL    !Obukhovs stability
181                                                     !param. z/l for u,T,q
182REAL, DIMENSION(SIZE(PTA))      :: ZRR
183REAL, DIMENSION(SIZE(PTA))      :: ZOT,ZOQ           !rougness length ref
184REAL, DIMENSION(SIZE(PTA))      :: ZPUZ,ZPTZ,ZPQZ    !PHI funct. for u,T,q
185
186REAL, DIMENSION(SIZE(PTA))      :: ZBF               !constants to compute gustiness factor
187
188REAL, DIMENSION(SIZE(PTA))      :: ZTAU       !momentum flux (W/m2)
189REAL, DIMENSION(SIZE(PTA))      :: ZHF        !sensible heat flux (W/m2)
190REAL, DIMENSION(SIZE(PTA))      :: ZEF        !latent heat flux (W/m2)
191REAL, DIMENSION(SIZE(PTA))      :: ZWBAR      !diag for webb correction but not used here after
192REAL, DIMENSION(SIZE(PTA))      :: ZTAUR      !momentum flux due to rain (W/m2)
193REAL, DIMENSION(SIZE(PTA))      :: ZRF        !sensible heat flux due to rain (W/m2)
194REAL, DIMENSION(SIZE(PTA))      :: ZCHN,ZCEN  !neutral coef. for heat and vapor
195
196REAL, DIMENSION(SIZE(PTA))      :: ZLV      !latent heat constant
197
198REAL, DIMENSION(SIZE(PTA))      :: ZTAC,ZDQSDT,ZDTMP,ZDWAT,ZALFAC ! for precipitation impact
199REAL, DIMENSION(SIZE(PTA))      :: ZXLR                           ! vaporisation  heat  at a given temperature
200REAL, DIMENSION(SIZE(PTA))      :: ZCPLW                          ! specific heat for water at a given temperature
201
202REAL, DIMENSION(SIZE(PTA))      :: ZUSTAR2  ! square of friction velocity
203
204REAL, DIMENSION(SIZE(PTA))      :: ZDIRCOSZW! orography slope cosine (=1 on water!)
205REAL, DIMENSION(SIZE(PTA))      :: ZAC      ! Aerodynamical conductance
206
207
208INTEGER, DIMENSION(SIZE(PTA))   :: ITERMAX             ! maximum number of iterations
209
210REAL    :: ZRVSRDM1,ZRDSRV,ZR2 ! thermodynamic constants
211REAL    :: ZBETAGUST           !gustiness factor
212REAL    :: ZZBL                !atm. boundary layer depth (m)
213REAL    :: ZVISW               !m2/s kinematic viscosity of water
214REAL    :: ZS                  !height of rougness length ref
215REAL    :: ZCH10               !transfer coef. at 10m
216
217REAL    :: QSAT_SEAWATER
218REAL    :: QSATSEAW_1D
219
220INTEGER :: J, JLOOP    !loop indice
221!REAL(KIND=JPRB) :: ZHOOK_HANDLE
222
223!--------- Modif Olive -----------------
224REAL, DIMENSION(SIZE(PTA))        :: PRHOA
225REAL, PARAMETER                   :: XUNDEF = 1.E+20
226
227REAL       :: XVCHRNK = 0.021
228REAL       :: XVZ0CM = 1.0E-5
229!REAL       :: XRIMAX
230
231
232INTEGER :: PREF             ! reference pressure for exner function
233INTEGER :: NGRVWAVES        ! Pour le choix du z0
234
235INCLUDE "YOMCST.h"
236
237!--------------------------------------
238
239
240PRHOA(:) = PPS(:) / (287.1 * PTA(:) * (1.+.61*PQA(:)))
241
242PREF = 100000.                     ! = 1000 hPa
243NGRVWAVES = 1
244
245PEXNA = (PPA/PREF)**(RD/RCPD)
246PEXNS = (PPS/PREF)**(RD/RCPD)
247
248!-------------------------------------------------------------------------------
249
250!       1.     Initializations
251!              ---------------
252
253!       1.1   Constants and parameters
254
255!IF (LHOOK) CALL DR_HOOK('COARE30_FLUX',0,ZHOOK_HANDLE)
256
257ZRVSRDM1  = XRV/XRD-1. ! 0.607766
258ZRDSRV    = XRD/XRV    ! 0.62198
259ZR2       = 1.-ZRDSRV  ! pas utilisé dans cette routine
260ZBETAGUST = 1.2        ! value based on TOGA-COARE experiment
261ZZBL      = 600.       ! Set a default value for boundary layer depth
262ZS        = 10.        ! Standard heigth =10m
263ZCH10     = 0.00115
264
265ZVISW     = 1.E-6
266
267!       1.2   Array initialization by undefined values
268
269PSFTH (:)=XUNDEF
270PSFTQ (:)=XUNDEF
271PUSTAR(:)=XUNDEF
272
273PCD(:) = XUNDEF
274PCDN(:) = XUNDEF
275PCH(:) = XUNDEF
276PCE(:) =XUNDEF
277PRI(:) = XUNDEF
278
279PRESA(:)=XUNDEF
280
281!-------------------------------------------------------------------------------
282!       2. INITIAL GUESS FOR THE ITERATIVE METHOD
283!          -------------------------------------
284
285!       2.0     Temperature
286
287! Set a non-zero value for the temperature gradient
288
289WHERE((PTA(:)*PEXNS(:)/PEXNA(:)-PSST(:))==0.)
290      ZTA(:)=PTA(:)-1E-3
291ELSEWHERE
292      ZTA(:)=PTA(:)
293ENDWHERE
294
295!       2.1     Wind and humidity
296
297! Sea surface specific humidity
298
299!PQSAT(:)=QSAT_SEAWATER(PSST(:),PPS(:))
300PQSAT(:)=QSATSEAW_1D(PSST(:),PPS(:))
301
302! Set a minimum value to wind
303
304!ZVMOD(:) = WIND_THRESHOLD(PVMOD(:),PUREF(:))
305
306
307ZVMOD = MAX(PVMOD , 0.1 * MIN(10.,PUREF) )    !set a minimum value to wind
308!ZVMOD = PVMOD    !set a minimum value to wind
309
310! Specific humidity at saturation at the atm. level
311
312ZPA(:) = XP00* (PEXNA(:)**(XCPD/XRD))
313!ZQASAT(:) = QSAT_SEAWATER(ZTA(:),ZPA(:))
314ZQASAT = QSATSEAW_1D(ZTA(:),ZPA(:))
315
316
317ZO(:)  = 0.0001
318ZWG(:) = 0.
319IF (LPWG) ZWG(:) = 0.5
320
321ZCHARN(:) = 0.011
322
323DO J=1,SIZE(PTA)
324
325  !      2.2       initial guess
326
327  ZDU(J) = ZVMOD(J)   !wind speed difference with surface current(=0) (m/s)
328                      !initial guess for gustiness factor
329  ZDT(J) = -(ZTA(J)/PEXNA(J)) + (PSST(J)/PEXNS(J)) !potential temperature difference
330  ZDQ(J) = PQSAT(J)-PQA(J)                         !specific humidity difference
331
332  ZDUWG(J) = SQRT(ZDU(J)**2+ZWG(J)**2)     !wind speed difference including gustiness ZWG
333
334  !      2.3   initialization of neutral coefficients
335
336  ZU10(J)  = ZDUWG(J)*LOG(ZS/ZO(J))/LOG(PUREF(J)/ZO(J))
337  ZUSR(J)  = 0.035*ZU10(J)
338  ZVISA(J) = 1.326E-5*(1.+6.542E-3*(ZTA(J)-XTT)+&
339             8.301E-6*(ZTA(J)-XTT)**2-4.84E-9*(ZTA(J)-XTT)**3) !Andrea (1989) CRREL Rep. 89-11
340
341  ZO10(J) = ZCHARN(J)*ZUSR(J)*ZUSR(J)/XG+0.11*ZVISA(J)/ZUSR(J)
342  ZCD(J)  = (XKARMAN/LOG(PUREF(J)/ZO10(J)))**2  !drag coefficient
343  ZCD10(J)= (XKARMAN/LOG(ZS/ZO10(J)))**2
344  ZCT10(J)= ZCH10/SQRT(ZCD10(J))
345  ZOT10(J)= ZS/EXP(XKARMAN/ZCT10(J))
346
347  !-------------------------------------------------------------------------------
348  !             Grachev and Fairall (JAM, 1997)
349  ZCT(J) = XKARMAN/LOG(PZREF(J)/ZOT10(J))      !temperature transfer coefficient
350  ZCC(J) = XKARMAN*ZCT(J)/ZCD(J)               !z/L vs Rib linear coef.
351
352  ZRIBCU(J) = -PUREF(J)/(ZZBL*0.004*ZBETAGUST**3) !saturation or plateau Rib
353  !ZRIBU(J) =-XG*PUREF(J)*(ZDT(J)+ZRVSRDM1*(ZTA(J)-XTT)*ZDQ)/&
354  !     &((ZTA(J)-XTT)*ZDUWG(J)**2)
355  ZRIBU(J)  = -XG*PUREF(J)*(ZDT(J)+ZRVSRDM1*ZTA(J)*ZDQ(J))/&
356               (ZTA(J)*ZDUWG(J)**2)
357
358  IF (ZRIBU(J)<0.) THEN
359    ZETU(J) = ZCC(J)*ZRIBU(J)/(1.+ZRIBU(J)/ZRIBCU(J))    !Unstable G and F
360  ELSE
361    ZETU(J) = ZCC(J)*ZRIBU(J)/(1.+27./9.*ZRIBU(J)/ZCC(J))!Stable
362  ENDIF
363
364  ZL10(J) = PUREF(J)/ZETU(J) !MO length
365
366ENDDO
367
368!  First guess M-O stability dependent scaling params. (u*,T*,q*) to estimate ZO and z/L (ZZL)
369ZUSR(:) = ZDUWG(:)*XKARMAN/(LOG(PUREF(:)/ZO10(:))-PSIFCTU(PUREF(1)/ZL10(1)))
370ZTSR(:) = -ZDT(:)*XKARMAN/(LOG(PZREF(:)/ZOT10(:))-PSIFCTT(PZREF(1)/ZL10(1)))
371ZQSR(:) = -ZDQ(:)*XKARMAN/(LOG(PZREF(:)/ZOT10(:))-PSIFCTT(PZREF(1)/ZL10(1)))
372
373ZZL(:) = 0.0
374
375DO J=1,SIZE(PTA)
376
377  IF (ZETU(J)>50.) THEN
378    ITERMAX(J) = 1
379  ELSE
380    ITERMAX(J) = 3 !number of iterations
381  ENDIF
382
383  !then modify Charnork for high wind speeds Chris Fairall's data
384  IF (ZDUWG(J)>10.) ZCHARN(J) = 0.011 + (0.018-0.011)*(ZDUWG(J)-10.)/(18.-10.)
385  IF (ZDUWG(J)>18.) ZCHARN(J) = 0.018
386
387  !                3.  ITERATIVE LOOP TO COMPUTE USR, TSR, QSR
388  !                -------------------------------------------
389
390  ZHWAVE(J) = 0.018*ZVMOD(J)*ZVMOD(J)*(1.+0.015*ZVMOD(J))
391  ZTWAVE(J) = 0.729*ZVMOD(J)
392  ZCWAVE(J) = XG*ZTWAVE(J)/(2.*XPI)
393  ZLWAVE(J) = ZTWAVE(J)*ZCWAVE(J)
394
395ENDDO
396
397DO JLOOP=1,MAXVAL(ITERMAX) ! begin of iterative loop
398
399  DO J=1,SIZE(PTA)
400
401    IF (JLOOP>ITERMAX(J)) CYCLE
402
403    IF (NGRVWAVES==0) THEN
404      ZO(J) = ZCHARN(J)*ZUSR(J)*ZUSR(J)/XG + 0.11*ZVISA(J)/ZUSR(J) !Smith 1988
405    ELSE IF (NGRVWAVES==1) THEN
406      ZO(J) = (50./(2.*XPI))*ZLWAVE(J)*(ZUSR(J)/ZCWAVE(J))**4.5 &
407              + 0.11*ZVISA(J)/ZUSR(J)                       !Oost et al. 2002
408    ELSE IF (NGRVWAVES==2) THEN
409      ZO(J) = 1200.*ZHWAVE(J)*(ZHWAVE(J)/ZLWAVE(J))**4.5 &
410              + 0.11*ZVISA(J)/ZUSR(J)                       !Taulor and Yelland 2001
411    ENDIF
412
413    ZRR(J) = ZO(J)*ZUSR(J)/ZVISA(J)
414    ZOQ(J) = MIN(1.15E-4 , 5.5E-5/ZRR(J)**0.6)
415    ZOT(J) = ZOQ(J)
416
417    ZZL(J) = XKARMAN * XG * PUREF(J) * &
418              ( ZTSR(J)*(1.+ZRVSRDM1*PQA(J)) + ZRVSRDM1*ZTA(J)*ZQSR(J) ) / &
419              ( ZTA(J)*ZUSR(J)*ZUSR(J)*(1.+ZRVSRDM1*PQA(J)) )
420    ZZTL(J)= ZZL(J)*PZREF(J)/PUREF(J)  ! for T
421!    ZZQL(J)=ZZL(J)*PZREF(J)/PUREF(J)  ! for Q
422  ENDDO
423
424  ZPUZ(:) = PSIFCTU(ZZL(1))
425  ZPTZ(:) = PSIFCTT(ZZTL(1))
426
427  DO J=1,SIZE(PTA)
428
429    ! ZPQZ(J)=PSIFCTT(ZZQL(J))
430    ZPQZ(J) = ZPTZ(J)
431
432    !             3.1 scale parameters
433
434    ZUSR(J) = ZDUWG(J)*XKARMAN/(LOG(PUREF(J)/ZO(J)) -ZPUZ(J))
435    ZTSR(J) = -ZDT(J)  *XKARMAN/(LOG(PZREF(J)/ZOT(J))-ZPTZ(J))
436    ZQSR(J) = -ZDQ(J)  *XKARMAN/(LOG(PZREF(J)/ZOQ(J))-ZPQZ(J))
437
438    !             3.2 Gustiness factor (ZWG)
439
440    IF(LPWG) THEN
441      ZBF(J) = -XG/ZTA(J)*ZUSR(J)*(ZTSR(J)+ZRVSRDM1*ZTA(J)*ZQSR(J))
442      IF (ZBF(J)>0.) THEN
443        ZWG(J) = ZBETAGUST*(ZBF(J)*ZZBL)**(1./3.)
444      ELSE
445        ZWG(J) = 0.2
446      ENDIF
447    ENDIF
448    ZDUWG(J) = SQRT(ZVMOD(J)**2 + ZWG(J)**2)
449
450  ENDDO
451
452ENDDO
453!-------------------------------------------------------------------------------
454
455!            4.  COMPUTE transfer coefficients PCD, PCH, ZCE and SURFACE FLUXES
456!                --------------------------------------------------------------
457
458ZTAU(:) = XUNDEF
459ZHF(:)  = XUNDEF
460ZEF(:)  = XUNDEF
461
462ZWBAR(:) = 0.
463ZTAUR(:) = 0.
464ZRF(:)   = 0.
465
466DO J=1,SIZE(PTA)
467
468
469  !            4. transfert coefficients PCD, PCH and PCE
470  !                 and neutral PCDN, ZCHN, ZCEN
471
472  PCD(J) = (ZUSR(J)/ZDUWG(J))**2.
473  PCH(J) = ZUSR(J)*ZTSR(J)/(ZDUWG(J)*(ZTA(J)*PEXNS(J)/PEXNA(J)-PSST(J)))
474  PCE(J) = ZUSR(J)*ZQSR(J)/(ZDUWG(J)*(PQA(J)-PQSAT(J)))
475
476  PCDN(J) = (XKARMAN/LOG(ZS/ZO(J)))**2.
477  ZCHN(J) = (XKARMAN/LOG(ZS/ZO(J)))*(XKARMAN/LOG(ZS/ZOT(J)))
478  ZCEN(J) = (XKARMAN/LOG(ZS/ZO(J)))*(XKARMAN/LOG(ZS/ZOQ(J)))
479
480  ZLV(J) = XLVTT + (XCPV-XCL)*(PSST(J)-XTT)
481
482  !            4. 2 surface fluxes
483
484  IF (ABS(PCDN(J))>1.E-2) THEN   !!!! secure COARE3.0 CODE
485    WRITE(*,*) 'pb PCDN in COARE30: ',PCDN(J)
486    WRITE(*,*) 'point: ',J,"/",SIZE(PTA)
487    WRITE(*,*) 'roughness: ', ZO(J)
488    WRITE(*,*) 'ustar: ',ZUSR(J)
489    WRITE(*,*) 'wind: ',ZDUWG(J)
490    CALL abort_physic('COARE30',': PCDN too large -> no convergence',1)
491  ELSE
492    ZTSR(J) = -ZTSR(J)
493    ZQSR(J) = -ZQSR(J)
494    ZTAU(J) = -PRHOA(J)*ZUSR(J)*ZUSR(J)*ZVMOD(J)/ZDUWG(J)
495    ZHF(J)  =  PRHOA(J)*XCPD*ZUSR(J)*ZTSR(J)
496    ZEF(J)  =  PRHOA(J)*ZLV(J)*ZUSR(J)*ZQSR(J)
497
498    !           4.3 Contributions to surface  fluxes due to rainfall
499
500    ! SB: a priori, le facteur ZRDSRV=XRD/XRV est introduit pour
501    !     adapter la formule de Clausius-Clapeyron (pour l'air
502    !     sec) au cas humide.
503    IF (LPRECIP) THEN
504
505      ! heat surface  fluxes
506
507      ZTAC(J)  = ZTA(J)-XTT
508
509      ZXLR(J)  = XLVTT + (XCPV-XCL)* ZTAC(J)                            ! latent heat of rain vaporization
510      ZDQSDT(J)= ZQASAT(J) * ZXLR(J) / (XRD*ZTA(J)**2)                  ! Clausius-Clapeyron relation
511      ZDTMP(J) = (1.0 + 3.309e-3*ZTAC(J) -1.44e-6*ZTAC(J)*ZTAC(J)) * &  !heat diffusivity
512                  0.02411 / (PRHOA(J)*XCPD)
513
514      ZDWAT(J) = 2.11e-5 * (XP00/ZPA(J)) * (ZTA(J)/XTT)**1.94           ! water vapour diffusivity from eq (13.3)
515      !                                                                 ! of Pruppacher and Klett (1978)
516      ZALFAC(J)= 1.0 / (1.0 + &                                         ! Eq.11 in GoF95
517                   ZRDSRV*ZDQSDT(J)*ZXLR(J)*ZDWAT(J)/(ZDTMP(J)*XCPD))   ! ZALFAC=wet-bulb factor (sans dim)
518      ZCPLW(J) = 4224.8482 + ZTAC(J) * &
519                              ( -4.707 + ZTAC(J) * &
520                                (0.08499 + ZTAC(J) * &
521                                  (1.2826e-3 + ZTAC(J) * &
522                                    (4.7884e-5 - 2.0027e-6* ZTAC(J))))) ! specific heat
523
524      ZRF(J)   = PRAIN(J) * ZCPLW(J) * ZALFAC(J) * &                    !Eq.12 in GoF95 !SIGNE?
525                   (PSST(J) - ZTA(J) + (PQSAT(J)-PQA(J))*ZXLR(J)/XCPD )
526
527      ! Momentum flux due to rainfall
528
529      ZTAUR(J)=-0.85*(PRAIN(J) *ZVMOD(J)) !pp3752 in FBR96
530
531    ENDIF
532
533    !             4.4   Webb correction to latent heat flux
534
535    ZWBAR(J)=- (1./ZRDSRV)*ZUSR(J)*ZQSR(J) / (1.0+(1./ZRDSRV)*PQA(J)) &
536               - ZUSR(J)*ZTSR(J)/ZTA(J)                        ! Eq.21*rhoa in FBR96
537
538    !             4.5   friction velocity which contains correction du to rain
539
540    ZUSTAR2(J)= - (ZTAU(J) + ZTAUR(J)) / PRHOA(J)
541    PUSTAR(J) =  SQRT(ZUSTAR2(J))
542
543    !             4.6   Total surface fluxes
544
545    PSFTH (J) =  ZHF(J) + ZRF(J)
546    PSFTQ (J) =  ZEF(J) / ZLV(J)
547
548  ENDIF
549ENDDO
550
551
552coeffs = [PCD,&
553       PCE,&
554       PCH]
555
556!-------------------------------------------------------------------------------
557
558!       5.  FINAL STEP : TOTAL SURFACE FLUXES AND DERIVED DIAGNOSTICS
559!           -----------
560!       5.1    Richardson number
561
562
563!------------STOP LA --------------------
564!ZDIRCOSZW(:) = 1.
565! CALL SURFACE_RI(PSST,PQSAT,PEXNS,PEXNA,ZTA,ZQASAT,&
566!                PZREF,PUREF,ZDIRCOSZW,PVMOD,PRI   )
567!!
568!!       5.2     Aerodynamical conductance and resistance
569!!
570!ZAC(:) = PCH(:)*ZVMOD(:)
571!PRESA(:) = 1. / MAX(ZAC(:),XSURF_EPSILON)
572
573!!       5.3 Z0 and Z0H over sea
574!!
575!PZ0SEA(:) =  ZCHARN(:) * ZUSTAR2(:) / XG + XVZ0CM * PCD(:) / PCDN(:)
576!!
577!!PZ0HSEA(:) = PZ0SEA(:)
578!!
579!IF (LHOOK) CALL DR_HOOK('COARE30_FLUX',1,ZHOOK_HANDLE)
580
581!-------------------------------------------------------------------------------
582
583END SUBROUTINE COARE30_FLUX_CNRM
584
585END MODULE coare30_flux_cnrm_mod
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