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!$Id: clcdrag.F90 2311 2015-06-25 07:45:24Z emillour $ |
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SUBROUTINE clcdrag(knon, nsrf, paprs, pplay,& |
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u1, v1, t1, q1, & |
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tsurf, qsurf, rugos, & |
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pcfm, pcfh) |
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USE dimphy |
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USE indice_sol_mod |
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IMPLICIT NONE |
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! ================================================================= c |
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! |
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! Objet : calcul des cdrags pour le moment (pcfm) et |
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! les flux de chaleur sensible et latente (pcfh). |
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! ================================================================= c |
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! knon----input-I- nombre de points pour un type de surface |
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! nsrf----input-I- indice pour le type de surface; voir indice_sol_mod.F90 |
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! u1-------input-R- vent zonal au 1er niveau du modele |
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! v1-------input-R- vent meridien au 1er niveau du modele |
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! t1-------input-R- temperature de l'air au 1er niveau du modele |
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! q1-------input-R- humidite de l'air au 1er niveau du modele |
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! tsurf------input-R- temperature de l'air a la surface |
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! qsurf---input-R- humidite de l'air a la surface |
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! rugos---input-R- rugosite |
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! |
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! pcfm---output-R- cdrag pour le moment |
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! pcfh---output-R- cdrag pour les flux de chaleur latente et sensible |
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! |
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INTEGER, INTENT(IN) :: knon, nsrf |
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REAL, DIMENSION(klon,klev+1), INTENT(IN) :: paprs |
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REAL, DIMENSION(klon,klev), INTENT(IN) :: pplay |
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REAL, DIMENSION(klon), INTENT(IN) :: u1, v1, t1, q1 |
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REAL, DIMENSION(klon), INTENT(IN) :: tsurf, qsurf |
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REAL, DIMENSION(klon), INTENT(IN) :: rugos |
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REAL, DIMENSION(klon), INTENT(OUT) :: pcfm, pcfh |
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! |
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! ================================================================= c |
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! |
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INCLUDE "YOMCST.h" |
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INCLUDE "YOETHF.h" |
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INCLUDE "clesphys.h" |
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! Quelques constantes et options: |
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!!$PB REAL, PARAMETER :: ckap=0.35, cb=5.0, cc=5.0, cd=5.0, cepdu2=(0.1)**2 |
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REAL, PARAMETER :: ckap=0.40, cb=5.0, cc=5.0, cd=5.0, cepdu2=(0.1)**2 |
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! Variables locales : |
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INTEGER :: i |
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REAL :: zdu2, ztsolv |
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REAL :: ztvd, zscf |
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REAL :: zucf, zcr |
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REAL :: friv, frih |
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REAL, DIMENSION(klon) :: zcfm1, zcfm2 |
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REAL, DIMENSION(klon) :: zcfh1, zcfh2 |
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REAL, DIMENSION(klon) :: zcdn |
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REAL, DIMENSION(klon) :: zri |
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REAL, DIMENSION(klon) :: zgeop1 ! geopotentiel au 1er niveau du modele |
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LOGICAL, PARAMETER :: zxli=.FALSE. ! calcul des cdrags selon Laurent Li |
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CHARACTER (LEN=80) :: abort_message |
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CHARACTER (LEN=20) :: modname = 'clcdrag' |
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! |
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! Fonctions thermodynamiques et fonctions d'instabilite |
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REAL :: fsta, fins, x |
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fsta(x) = 1.0 / (1.0+10.0*x*(1+8.0*x)) |
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fins(x) = SQRT(1.0-18.0*x) |
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abort_message='obsolete, remplace par cdrag, use at you own risk' |
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CALL abort_physic(modname,abort_message,1) |
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! ================================================================= c |
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! Calculer le geopotentiel du premier couche de modele |
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DO i = 1, knon |
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zgeop1(i) = RD * t1(i) / (0.5*(paprs(i,1)+pplay(i,1))) & |
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* (paprs(i,1)-pplay(i,1)) |
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END DO |
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! ================================================================= c |
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! |
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! Calculer le frottement au sol (Cdrag) |
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! |
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DO i = 1, knon |
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zdu2 = MAX(cepdu2,u1(i)**2+v1(i)**2) |
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ztsolv = tsurf(i) * (1.0+RETV*qsurf(i)) |
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ztvd = (t1(i)+zgeop1(i)/RCPD/(1.+RVTMP2*q1(i))) & |
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*(1.+RETV*q1(i)) |
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zri(i) = zgeop1(i)*(ztvd-ztsolv)/(zdu2*ztvd) |
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zcdn(i) = (ckap/LOG(1.+zgeop1(i)/(RG*rugos(i))))**2 |
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!!$ IF (zri(i) .ge. 0.) THEN ! situation stable |
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IF (zri(i) .GT. 0.) THEN ! situation stable |
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zri(i) = MIN(20.,zri(i)) |
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IF (.NOT.zxli) THEN |
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zscf = SQRT(1.+cd*ABS(zri(i))) |
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FRIV = AMAX1(1. / (1.+2.*CB*zri(i)/ZSCF), f_ri_cd_min) |
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zcfm1(i) = zcdn(i) * FRIV |
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FRIH = AMAX1(1./ (1.+3.*CB*zri(i)*ZSCF), f_ri_cd_min ) |
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!!$ PB zcfh1(i) = zcdn(i) * FRIH |
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!!$ PB zcfh1(i) = f_cdrag_stable * zcdn(i) * FRIH |
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zcfh1(i) = f_cdrag_ter * zcdn(i) * FRIH |
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IF(nsrf.EQ.is_oce) zcfh1(i) = f_cdrag_oce * zcdn(i) * FRIH |
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!!$ PB |
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pcfm(i) = zcfm1(i) |
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pcfh(i) = zcfh1(i) |
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ELSE |
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pcfm(i) = zcdn(i)* fsta(zri(i)) |
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pcfh(i) = zcdn(i)* fsta(zri(i)) |
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ENDIF |
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ELSE ! situation instable |
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IF (.NOT.zxli) THEN |
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zucf = 1./(1.+3.0*cb*cc*zcdn(i)*SQRT(ABS(zri(i)) & |
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*(1.0+zgeop1(i)/(RG*rugos(i))))) |
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zcfm2(i) = zcdn(i)*amax1((1.-2.0*cb*zri(i)*zucf),f_ri_cd_min) |
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!!$PB zcfh2(i) = zcdn(i)*amax1((1.-3.0*cb*zri(i)*zucf),f_ri_cd_min) |
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zcfh2(i) = f_cdrag_ter*zcdn(i)*amax1((1.-3.0*cb*zri(i)*zucf),f_ri_cd_min) |
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pcfm(i) = zcfm2(i) |
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pcfh(i) = zcfh2(i) |
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ELSE |
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pcfm(i) = zcdn(i)* fins(zri(i)) |
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pcfh(i) = zcdn(i)* fins(zri(i)) |
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ENDIF |
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IF(iflag_gusts==0) THEN |
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! cdrah sur l'ocean cf. Miller et al. (1992) - only active when gustiness parameterization is not active |
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zcr = (0.0016/(zcdn(i)*SQRT(zdu2)))*ABS(ztvd-ztsolv)**(1./3.) |
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IF(nsrf.EQ.is_oce) pcfh(i) =f_cdrag_oce* zcdn(i)*(1.0+zcr**1.25)**(1./1.25) |
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ENDIF |
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ENDIF |
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END DO |
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! ================================================================= c |
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! IM cf JLD : on seuille cdrag_m et cdrag_h |
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IF (nsrf == is_oce) THEN |
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DO i=1,knon |
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pcfm(i)=MIN(pcfm(i),cdmmax) |
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pcfh(i)=MIN(pcfh(i),cdhmax) |
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END DO |
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END IF |
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END SUBROUTINE clcdrag |
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