source: LMDZ6/branches/cirrus/libf/phylmd/coare30_flux_cnrm_mod.F90 @ 5407

Last change on this file since 5407 was 5202, checked in by Laurent Fairhead, 3 months ago

Updating cirrus branch to trunk revision 5171
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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
75!----------Rajout Olive ---------
76USE dimphy
77USE indice_sol_mod
78USE coare_cp_mod, ONLY: PSIFCTT=>psit_30, PSIFCTU=>psiuo
79
80!--------------------------------
81
82USE MODD_CSTS,       ONLY : XKARMAN, XG, XSTEFAN, XRD, XRV, XPI, &
83                            XLVTT, XCL, XCPD, XCPV, XRHOLW, XTT, &
84                            XP00
85
86!USE MODD_SURF_ATM,   ONLY : XVZ0CM
87!
88!USE MODD_SURF_PAR,   ONLY : XUNDEF, XSURF_EPSILON
89!USE MODD_WATER_PAR
90!
91!USE MODI_SURFACE_RI
92!USE MODI_WIND_THRESHOLD
93!USE MODE_COARE30_PSI
94!
95!USE MODE_THERMOS
96!
97!
98!USE MODI_ABOR1_SFX
99!
100!
101!USE YOMHOOK   ,ONLY : LHOOK,   DR_HOOK
102!USE PARKIND1  ,ONLY : JPRB
103!
104IMPLICIT NONE
105!
106!*      0.1    declarations of arguments
107!
108!
109!
110!TYPE(SEAFLUX_t), INTENT(INOUT) :: S
111!
112REAL, DIMENSION(klon), INTENT(IN)       :: PTA   ! air temperature at atm. level (K)
113REAL, 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
116REAL, DIMENSION(klon), INTENT(IN)       :: PVMOD ! module of wind at atm. wind level (m/s)
117REAL, DIMENSION(klon), INTENT(IN)       :: PZREF ! atm. level for temp. and humidity (m)
118REAL, DIMENSION(klon), INTENT(IN)       :: PUREF ! atm. level for wind (m)
119REAL, DIMENSION(klon), INTENT(IN)       :: PSST  ! Sea Surface Temperature (K)
120!REAL, DIMENSION(:), INTENT(IN)       :: PEXNS ! Exner function at sea surface
121REAL, DIMENSION(klon), INTENT(IN)       :: PPS   ! air pressure at sea surface (Pa)
122REAL, DIMENSION(klon), INTENT(IN)       :: PRAIN !precipitation rate (kg/s/m2)
123REAL, DIMENSION(klon), INTENT(IN)       :: PPA        ! air pressure at atm level (Pa)
124REAL, DIMENSION(klon), INTENT(IN)       :: PQSATA        ! air pressure at atm level (Pa)
125!
126REAL, DIMENSION(klon), INTENT(INOUT)    :: PZ0SEA! roughness length over the ocean
127!
128!  surface fluxes : latent heat, sensible heat, friction fluxes
129REAL, DIMENSION(klon), INTENT(OUT)      :: PSFTH ! heat flux (W/m2)
130REAL, DIMENSION(klon), INTENT(OUT)      :: PSFTQ ! water flux (kg/m2/s)
131REAL, DIMENSION(klon), INTENT(OUT)      :: PUSTAR! friction velocity (m/s)
132!
133! diagnostics
134REAL, DIMENSION(klon), INTENT(OUT)      :: PQSAT ! humidity at saturation
135REAL, DIMENSION(klon), INTENT(OUT)      :: PCD   ! heat drag coefficient
136REAL, DIMENSION(klon), INTENT(OUT)      :: PCDN  ! momentum drag coefficient
137REAL, DIMENSION(klon), INTENT(OUT)      :: PCH   ! neutral momentum drag coefficient
138REAL, DIMENSION(klon), INTENT(OUT)      :: PCE  !transfer coef. for latent heat flux
139REAL, DIMENSION(klon), INTENT(OUT)      :: PRI   ! Richardson number
140REAL, DIMENSION(klon), INTENT(OUT)      :: PRESA ! aerodynamical resistance
141REAL, DIMENSION(klon), INTENT(OUT)      :: PZ0HSEA ! heat roughness length
142
143LOGICAL,            INTENT(IN)    :: LPRECIP   !
144LOGICAL,            INTENT(IN)    :: LPWG    !
145real, dimension(3), intent(inout)      :: coeffs
146!
147!
148
149!INCLUDE "YOMCST.h"
150!INCLUDE "clesphys.h"
151
152!*      0.2    declarations of local variables
153!
154REAL, DIMENSION(SIZE(PTA))      :: ZVMOD    ! wind intensity
155REAL, DIMENSION(SIZE(PTA))      :: ZPA      ! Pressure at atm. level
156REAL, DIMENSION(SIZE(PTA))      :: ZTA      ! Temperature at atm. level
157REAL, DIMENSION(SIZE(PTA))      :: ZQASAT   ! specific humidity at saturation  at atm. level (kg/kg)
158!
159!rajout
160REAL, DIMENSION(SIZE(PTA))       :: PEXNA      ! Exner function at atm level
161REAL, DIMENSION(SIZE(PTA))       :: PEXNS      ! Exner function at atm level
162!
163REAL, DIMENSION(SIZE(PTA))      :: ZO       ! rougness length ref
164REAL, DIMENSION(SIZE(PTA))      :: ZWG      ! gustiness factor (m/s)
165!
166REAL, DIMENSION(SIZE(PTA))      :: ZDU,ZDT,ZDQ,ZDUWG !differences
167!
168REAL, DIMENSION(SIZE(PTA))      :: ZUSR        !velocity scaling parameter "ustar" (m/s) = friction velocity
169REAL, DIMENSION(SIZE(PTA))      :: ZTSR        !temperature sacling parameter "tstar" (degC)
170REAL, DIMENSION(SIZE(PTA))      :: ZQSR        !humidity scaling parameter "qstar" (kg/kg)
171!
172REAL, DIMENSION(SIZE(PTA))      :: ZU10,ZT10   !vertical profils (10-m height)
173REAL, DIMENSION(SIZE(PTA))      :: ZVISA       !kinematic viscosity of dry air
174REAL, DIMENSION(SIZE(PTA))      :: ZO10,ZOT10  !roughness length at 10m
175REAL, DIMENSION(SIZE(PTA))      :: ZCD,ZCT,ZCC
176REAL, DIMENSION(SIZE(PTA))      :: ZCD10,ZCT10 !transfer coef. at 10m
177REAL, DIMENSION(SIZE(PTA))      :: ZRIBU,ZRIBCU
178REAL, DIMENSION(SIZE(PTA))      :: ZETU,ZL10
179!
180REAL, DIMENSION(SIZE(PTA))      :: ZCHARN                      !Charnock number depends on wind module
181REAL, DIMENSION(SIZE(PTA))      :: ZTWAVE,ZHWAVE,ZCWAVE,ZLWAVE !to compute gravity waves' impact
182!
183REAL, DIMENSION(SIZE(PTA))      :: ZZL,ZZTL!,ZZQL    !Obukhovs stability
184                                                     !param. z/l for u,T,q
185REAL, DIMENSION(SIZE(PTA))      :: ZRR
186REAL, DIMENSION(SIZE(PTA))      :: ZOT,ZOQ           !rougness length ref
187REAL, DIMENSION(SIZE(PTA))      :: ZPUZ,ZPTZ,ZPQZ    !PHI funct. for u,T,q
188!
189REAL, DIMENSION(SIZE(PTA))      :: ZBF               !constants to compute gustiness factor
190!
191REAL, DIMENSION(SIZE(PTA))      :: ZTAU       !momentum flux (W/m2)
192REAL, DIMENSION(SIZE(PTA))      :: ZHF        !sensible heat flux (W/m2)
193REAL, DIMENSION(SIZE(PTA))      :: ZEF        !latent heat flux (W/m2)
194REAL, DIMENSION(SIZE(PTA))      :: ZWBAR      !diag for webb correction but not used here after
195REAL, DIMENSION(SIZE(PTA))      :: ZTAUR      !momentum flux due to rain (W/m2)
196REAL, DIMENSION(SIZE(PTA))      :: ZRF        !sensible heat flux due to rain (W/m2)
197REAL, DIMENSION(SIZE(PTA))      :: ZCHN,ZCEN  !neutral coef. for heat and vapor
198!
199REAL, DIMENSION(SIZE(PTA))      :: ZLV      !latent heat constant
200!
201REAL, DIMENSION(SIZE(PTA))      :: ZTAC,ZDQSDT,ZDTMP,ZDWAT,ZALFAC ! for precipitation impact
202REAL, DIMENSION(SIZE(PTA))      :: ZXLR                           ! vaporisation  heat  at a given temperature
203REAL, DIMENSION(SIZE(PTA))      :: ZCPLW                          ! specific heat for water at a given temperature
204!
205REAL, DIMENSION(SIZE(PTA))      :: ZUSTAR2  ! square of friction velocity
206!
207REAL, DIMENSION(SIZE(PTA))      :: ZDIRCOSZW! orography slope cosine (=1 on water!)
208REAL, DIMENSION(SIZE(PTA))      :: ZAC      ! Aerodynamical conductance
209!
210!
211INTEGER, DIMENSION(SIZE(PTA))   :: ITERMAX             ! maximum number of iterations
212!
213REAL    :: ZRVSRDM1,ZRDSRV,ZR2 ! thermodynamic constants
214REAL    :: ZBETAGUST           !gustiness factor
215REAL    :: ZZBL                !atm. boundary layer depth (m)
216REAL    :: ZVISW               !m2/s kinematic viscosity of water
217REAL    :: ZS                  !height of rougness length ref
218REAL    :: ZCH10               !transfer coef. at 10m
219
220REAL    :: QSAT_SEAWATER
221REAL    :: QSATSEAW_1D
222!
223INTEGER :: J, JLOOP    !loop indice
224!REAL(KIND=JPRB) :: ZHOOK_HANDLE
225
226!--------- Modif Olive -----------------
227REAL, DIMENSION(SIZE(PTA))        :: PRHOA
228REAL, PARAMETER                   :: XUNDEF = 1.E+20
229
230REAL       :: XVCHRNK = 0.021
231REAL       :: XVZ0CM = 1.0E-5
232!REAL       :: XRIMAX
233
234
235INTEGER :: PREF             ! reference pressure for exner function
236INTEGER :: NGRVWAVES        ! Pour le choix du z0
237
238INCLUDE "YOMCST.h"
239INCLUDE "clesphys.h"
240
241!--------------------------------------
242
243
244PRHOA(:) = PPS(:) / (287.1 * PTA(:) * (1.+.61*PQA(:)))
245
246PREF = 100000.                     ! = 1000 hPa
247NGRVWAVES = 1
248
249PEXNA = (PPA/PREF)**(RD/RCPD)
250PEXNS = (PPS/PREF)**(RD/RCPD)
251
252!
253!-------------------------------------------------------------------------------
254!
255!       1.     Initializations
256!              ---------------
257!
258!       1.1   Constants and parameters
259!
260!IF (LHOOK) CALL DR_HOOK('COARE30_FLUX',0,ZHOOK_HANDLE)
261!
262ZRVSRDM1  = XRV/XRD-1. ! 0.607766
263ZRDSRV    = XRD/XRV    ! 0.62198
264ZR2       = 1.-ZRDSRV  ! pas utilisé dans cette routine
265ZBETAGUST = 1.2        ! value based on TOGA-COARE experiment
266ZZBL      = 600.       ! Set a default value for boundary layer depth
267ZS        = 10.        ! Standard heigth =10m
268ZCH10     = 0.00115
269!
270ZVISW     = 1.E-6
271!
272!       1.2   Array initialization by undefined values
273!
274PSFTH (:)=XUNDEF
275PSFTQ (:)=XUNDEF
276PUSTAR(:)=XUNDEF
277!
278PCD(:) = XUNDEF
279PCDN(:) = XUNDEF
280PCH(:) = XUNDEF
281PCE(:) =XUNDEF
282PRI(:) = XUNDEF
283!
284PRESA(:)=XUNDEF
285!
286!-------------------------------------------------------------------------------
287!       2. INITIAL GUESS FOR THE ITERATIVE METHOD
288!          -------------------------------------
289!
290!       2.0     Temperature
291!
292! Set a non-zero value for the temperature gradient
293!
294WHERE((PTA(:)*PEXNS(:)/PEXNA(:)-PSST(:))==0.)
295      ZTA(:)=PTA(:)-1E-3
296ELSEWHERE
297      ZTA(:)=PTA(:)
298ENDWHERE
299
300!       2.1     Wind and humidity
301!
302! Sea surface specific humidity
303!
304!PQSAT(:)=QSAT_SEAWATER(PSST(:),PPS(:))
305PQSAT(:)=QSATSEAW_1D(PSST(:),PPS(:))
306
307
308
309!
310! Set a minimum value to wind
311!
312!ZVMOD(:) = WIND_THRESHOLD(PVMOD(:),PUREF(:))
313
314
315ZVMOD = MAX(PVMOD , 0.1 * MIN(10.,PUREF) )    !set a minimum value to wind
316!ZVMOD = PVMOD    !set a minimum value to wind
317
318!
319! Specific humidity at saturation at the atm. level
320!
321ZPA(:) = XP00* (PEXNA(:)**(XCPD/XRD))
322!ZQASAT(:) = QSAT_SEAWATER(ZTA(:),ZPA(:))
323ZQASAT = QSATSEAW_1D(ZTA(:),ZPA(:))
324
325
326!
327!
328ZO(:)  = 0.0001
329ZWG(:) = 0.
330IF (LPWG) ZWG(:) = 0.5
331!
332ZCHARN(:) = 0.011
333!
334DO J=1,SIZE(PTA)
335  !
336  !      2.2       initial guess
337  !
338  ZDU(J) = ZVMOD(J)   !wind speed difference with surface current(=0) (m/s)
339                      !initial guess for gustiness factor
340  ZDT(J) = -(ZTA(J)/PEXNA(J)) + (PSST(J)/PEXNS(J)) !potential temperature difference
341  ZDQ(J) = PQSAT(J)-PQA(J)                         !specific humidity difference
342  !
343  ZDUWG(J) = SQRT(ZDU(J)**2+ZWG(J)**2)     !wind speed difference including gustiness ZWG
344  !
345  !      2.3   initialization of neutral coefficients
346  !
347  ZU10(J)  = ZDUWG(J)*LOG(ZS/ZO(J))/LOG(PUREF(J)/ZO(J))
348  ZUSR(J)  = 0.035*ZU10(J)
349  ZVISA(J) = 1.326E-5*(1.+6.542E-3*(ZTA(J)-XTT)+&
350             8.301E-6*(ZTA(J)-XTT)**2-4.84E-9*(ZTA(J)-XTT)**3) !Andrea (1989) CRREL Rep. 89-11
351  !
352  ZO10(J) = ZCHARN(J)*ZUSR(J)*ZUSR(J)/XG+0.11*ZVISA(J)/ZUSR(J)
353  ZCD(J)  = (XKARMAN/LOG(PUREF(J)/ZO10(J)))**2  !drag coefficient
354  ZCD10(J)= (XKARMAN/LOG(ZS/ZO10(J)))**2
355  ZCT10(J)= ZCH10/SQRT(ZCD10(J))
356  ZOT10(J)= ZS/EXP(XKARMAN/ZCT10(J))
357  !
358  !-------------------------------------------------------------------------------
359  !             Grachev and Fairall (JAM, 1997)
360  ZCT(J) = XKARMAN/LOG(PZREF(J)/ZOT10(J))      !temperature transfer coefficient
361  ZCC(J) = XKARMAN*ZCT(J)/ZCD(J)               !z/L vs Rib linear coef.
362  !
363  ZRIBCU(J) = -PUREF(J)/(ZZBL*0.004*ZBETAGUST**3) !saturation or plateau Rib
364  !ZRIBU(J) =-XG*PUREF(J)*(ZDT(J)+ZRVSRDM1*(ZTA(J)-XTT)*ZDQ)/&
365  !     &((ZTA(J)-XTT)*ZDUWG(J)**2)
366  ZRIBU(J)  = -XG*PUREF(J)*(ZDT(J)+ZRVSRDM1*ZTA(J)*ZDQ(J))/&
367               (ZTA(J)*ZDUWG(J)**2)
368  !
369  IF (ZRIBU(J)<0.) THEN
370    ZETU(J) = ZCC(J)*ZRIBU(J)/(1.+ZRIBU(J)/ZRIBCU(J))    !Unstable G and F
371  ELSE
372    ZETU(J) = ZCC(J)*ZRIBU(J)/(1.+27./9.*ZRIBU(J)/ZCC(J))!Stable
373  ENDIF
374  !
375  ZL10(J) = PUREF(J)/ZETU(J) !MO length
376  !
377ENDDO
378!
379!  First guess M-O stability dependent scaling params. (u*,T*,q*) to estimate ZO and z/L (ZZL)
380ZUSR(:) = ZDUWG(:)*XKARMAN/(LOG(PUREF(:)/ZO10(:))-PSIFCTU(PUREF(1)/ZL10(1)))
381ZTSR(:) = -ZDT(:)*XKARMAN/(LOG(PZREF(:)/ZOT10(:))-PSIFCTT(PZREF(1)/ZL10(1)))
382ZQSR(:) = -ZDQ(:)*XKARMAN/(LOG(PZREF(:)/ZOT10(:))-PSIFCTT(PZREF(1)/ZL10(1)))
383!
384ZZL(:) = 0.0
385!
386DO J=1,SIZE(PTA)
387  !
388  IF (ZETU(J)>50.) THEN
389    ITERMAX(J) = 1
390  ELSE
391    ITERMAX(J) = 3 !number of iterations
392  ENDIF
393  !
394  !then modify Charnork for high wind speeds Chris Fairall's data
395  IF (ZDUWG(J)>10.) ZCHARN(J) = 0.011 + (0.018-0.011)*(ZDUWG(J)-10.)/(18.-10.)
396  IF (ZDUWG(J)>18.) ZCHARN(J) = 0.018
397  !
398  !                3.  ITERATIVE LOOP TO COMPUTE USR, TSR, QSR
399  !                -------------------------------------------
400  !
401  ZHWAVE(J) = 0.018*ZVMOD(J)*ZVMOD(J)*(1.+0.015*ZVMOD(J))
402  ZTWAVE(J) = 0.729*ZVMOD(J)
403  ZCWAVE(J) = XG*ZTWAVE(J)/(2.*XPI)
404  ZLWAVE(J) = ZTWAVE(J)*ZCWAVE(J)
405  !
406ENDDO
407!
408
409!
410DO JLOOP=1,MAXVAL(ITERMAX) ! begin of iterative loop
411  !
412  DO J=1,SIZE(PTA)
413    !
414    IF (JLOOP>ITERMAX(J)) CYCLE
415    !
416    IF (NGRVWAVES==0) THEN
417      ZO(J) = ZCHARN(J)*ZUSR(J)*ZUSR(J)/XG + 0.11*ZVISA(J)/ZUSR(J) !Smith 1988
418    ELSE IF (NGRVWAVES==1) THEN
419      ZO(J) = (50./(2.*XPI))*ZLWAVE(J)*(ZUSR(J)/ZCWAVE(J))**4.5 &
420              + 0.11*ZVISA(J)/ZUSR(J)                       !Oost et al. 2002
421    ELSE IF (NGRVWAVES==2) THEN
422      ZO(J) = 1200.*ZHWAVE(J)*(ZHWAVE(J)/ZLWAVE(J))**4.5 &
423              + 0.11*ZVISA(J)/ZUSR(J)                       !Taulor and Yelland 2001
424    ENDIF
425    !
426    ZRR(J) = ZO(J)*ZUSR(J)/ZVISA(J)
427    ZOQ(J) = MIN(1.15E-4 , 5.5E-5/ZRR(J)**0.6)
428    ZOT(J) = ZOQ(J)
429    !
430    ZZL(J) = XKARMAN * XG * PUREF(J) * &
431              ( ZTSR(J)*(1.+ZRVSRDM1*PQA(J)) + ZRVSRDM1*ZTA(J)*ZQSR(J) ) / &
432              ( ZTA(J)*ZUSR(J)*ZUSR(J)*(1.+ZRVSRDM1*PQA(J)) )
433    ZZTL(J)= ZZL(J)*PZREF(J)/PUREF(J)  ! for T
434!    ZZQL(J)=ZZL(J)*PZREF(J)/PUREF(J)  ! for Q
435  ENDDO
436  !
437  ZPUZ(:) = PSIFCTU(ZZL(1))
438  ZPTZ(:) = PSIFCTT(ZZTL(1))
439  !
440  DO J=1,SIZE(PTA)
441    !
442    ! ZPQZ(J)=PSIFCTT(ZZQL(J))
443    ZPQZ(J) = ZPTZ(J)
444    !
445    !             3.1 scale parameters
446    !
447    ZUSR(J) = ZDUWG(J)*XKARMAN/(LOG(PUREF(J)/ZO(J)) -ZPUZ(J))
448    ZTSR(J) = -ZDT(J)  *XKARMAN/(LOG(PZREF(J)/ZOT(J))-ZPTZ(J))
449    ZQSR(J) = -ZDQ(J)  *XKARMAN/(LOG(PZREF(J)/ZOQ(J))-ZPQZ(J))
450    !
451    !             3.2 Gustiness factor (ZWG)
452    !
453    IF(LPWG) THEN
454      ZBF(J) = -XG/ZTA(J)*ZUSR(J)*(ZTSR(J)+ZRVSRDM1*ZTA(J)*ZQSR(J))
455      IF (ZBF(J)>0.) THEN
456        ZWG(J) = ZBETAGUST*(ZBF(J)*ZZBL)**(1./3.)
457      ELSE
458        ZWG(J) = 0.2
459      ENDIF
460    ENDIF
461    ZDUWG(J) = SQRT(ZVMOD(J)**2 + ZWG(J)**2)
462    !
463  ENDDO
464  !
465ENDDO
466!-------------------------------------------------------------------------------
467!
468!            4.  COMPUTE transfer coefficients PCD, PCH, ZCE and SURFACE FLUXES
469!                --------------------------------------------------------------
470!
471ZTAU(:) = XUNDEF
472ZHF(:)  = XUNDEF
473ZEF(:)  = XUNDEF
474!
475ZWBAR(:) = 0.
476ZTAUR(:) = 0.
477ZRF(:)   = 0.
478!
479DO J=1,SIZE(PTA)
480  !
481  !
482  !            4. transfert coefficients PCD, PCH and PCE
483  !                 and neutral PCDN, ZCHN, ZCEN
484  !
485  PCD(J) = (ZUSR(J)/ZDUWG(J))**2.
486  PCH(J) = ZUSR(J)*ZTSR(J)/(ZDUWG(J)*(ZTA(J)*PEXNS(J)/PEXNA(J)-PSST(J)))
487  PCE(J) = ZUSR(J)*ZQSR(J)/(ZDUWG(J)*(PQA(J)-PQSAT(J)))
488  !
489  PCDN(J) = (XKARMAN/LOG(ZS/ZO(J)))**2.
490  ZCHN(J) = (XKARMAN/LOG(ZS/ZO(J)))*(XKARMAN/LOG(ZS/ZOT(J)))
491  ZCEN(J) = (XKARMAN/LOG(ZS/ZO(J)))*(XKARMAN/LOG(ZS/ZOQ(J)))
492  !
493  ZLV(J) = XLVTT + (XCPV-XCL)*(PSST(J)-XTT)
494  !
495  !            4. 2 surface fluxes
496  !
497  IF (ABS(PCDN(J))>1.E-2) THEN   !!!! secure COARE3.0 CODE
498    write(*,*) 'pb PCDN in COARE30: ',PCDN(J)
499    write(*,*) 'point: ',J,"/",SIZE(PTA)
500    write(*,*) 'roughness: ', ZO(J)
501    write(*,*) 'ustar: ',ZUSR(J)
502    write(*,*) 'wind: ',ZDUWG(J)
503    CALL abort_physic('COARE30',': PCDN too large -> no convergence',1)
504  ELSE
505    ZTSR(J) = -ZTSR(J)
506    ZQSR(J) = -ZQSR(J)
507    ZTAU(J) = -PRHOA(J)*ZUSR(J)*ZUSR(J)*ZVMOD(J)/ZDUWG(J)
508    ZHF(J)  =  PRHOA(J)*XCPD*ZUSR(J)*ZTSR(J)
509    ZEF(J)  =  PRHOA(J)*ZLV(J)*ZUSR(J)*ZQSR(J)
510    !
511    !           4.3 Contributions to surface  fluxes due to rainfall
512    !
513    ! SB: a priori, le facteur ZRDSRV=XRD/XRV est introduit pour
514    !     adapter la formule de Clausius-Clapeyron (pour l'air
515    !     sec) au cas humide.
516    IF (LPRECIP) THEN
517      !
518      ! heat surface  fluxes
519      !
520      ZTAC(J)  = ZTA(J)-XTT
521      !
522      ZXLR(J)  = XLVTT + (XCPV-XCL)* ZTAC(J)                            ! latent heat of rain vaporization
523      ZDQSDT(J)= ZQASAT(J) * ZXLR(J) / (XRD*ZTA(J)**2)                  ! Clausius-Clapeyron relation
524      ZDTMP(J) = (1.0 + 3.309e-3*ZTAC(J) -1.44e-6*ZTAC(J)*ZTAC(J)) * &  !heat diffusivity
525                  0.02411 / (PRHOA(J)*XCPD)
526      !
527      ZDWAT(J) = 2.11e-5 * (XP00/ZPA(J)) * (ZTA(J)/XTT)**1.94           ! water vapour diffusivity from eq (13.3)
528      !                                                                 ! of Pruppacher and Klett (1978)
529      ZALFAC(J)= 1.0 / (1.0 + &                                         ! Eq.11 in GoF95
530                   ZRDSRV*ZDQSDT(J)*ZXLR(J)*ZDWAT(J)/(ZDTMP(J)*XCPD))   ! ZALFAC=wet-bulb factor (sans dim)
531      ZCPLW(J) = 4224.8482 + ZTAC(J) * &
532                              ( -4.707 + ZTAC(J) * &
533                                (0.08499 + ZTAC(J) * &
534                                  (1.2826e-3 + ZTAC(J) * &
535                                    (4.7884e-5 - 2.0027e-6* ZTAC(J))))) ! specific heat
536      !
537      ZRF(J)   = PRAIN(J) * ZCPLW(J) * ZALFAC(J) * &                    !Eq.12 in GoF95 !SIGNE?
538                   (PSST(J) - ZTA(J) + (PQSAT(J)-PQA(J))*ZXLR(J)/XCPD )
539      !
540      ! Momentum flux due to rainfall
541      !
542      ZTAUR(J)=-0.85*(PRAIN(J) *ZVMOD(J)) !pp3752 in FBR96
543      !
544    ENDIF
545    !
546    !             4.4   Webb correction to latent heat flux
547    !
548    ZWBAR(J)=- (1./ZRDSRV)*ZUSR(J)*ZQSR(J) / (1.0+(1./ZRDSRV)*PQA(J)) &
549               - ZUSR(J)*ZTSR(J)/ZTA(J)                        ! Eq.21*rhoa in FBR96
550    !
551    !             4.5   friction velocity which contains correction du to rain
552    !
553    ZUSTAR2(J)= - (ZTAU(J) + ZTAUR(J)) / PRHOA(J)
554    PUSTAR(J) =  SQRT(ZUSTAR2(J))
555    !
556    !             4.6   Total surface fluxes
557    !
558    PSFTH (J) =  ZHF(J) + ZRF(J)
559    PSFTQ (J) =  ZEF(J) / ZLV(J)
560    !
561  ENDIF
562ENDDO
563
564
565coeffs = [PCD,&
566       PCE,&
567       PCH]
568
569!-------------------------------------------------------------------------------
570!
571!       5.  FINAL STEP : TOTAL SURFACE FLUXES AND DERIVED DIAGNOSTICS
572!           -----------
573!       5.1    Richardson number
574!
575!
576!------------STOP LA --------------------
577!ZDIRCOSZW(:) = 1.
578! CALL SURFACE_RI(PSST,PQSAT,PEXNS,PEXNA,ZTA,ZQASAT,&
579!                PZREF,PUREF,ZDIRCOSZW,PVMOD,PRI   )
580!!
581!!       5.2     Aerodynamical conductance and resistance
582!!
583!ZAC(:) = PCH(:)*ZVMOD(:)
584!PRESA(:) = 1. / MAX(ZAC(:),XSURF_EPSILON)
585!
586!!       5.3 Z0 and Z0H over sea
587!!
588!PZ0SEA(:) =  ZCHARN(:) * ZUSTAR2(:) / XG + XVZ0CM * PCD(:) / PCDN(:)
589!!
590!!PZ0HSEA(:) = PZ0SEA(:)
591!!
592!IF (LHOOK) CALL DR_HOOK('COARE30_FLUX',1,ZHOOK_HANDLE)
593!
594!-------------------------------------------------------------------------------
595!
596END SUBROUTINE COARE30_FLUX_CNRM
597
598end module coare30_flux_cnrm_mod
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