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guez |
52 |
SUBROUTINE flxflux(pdtime, pqen, pqsen, ptenh, pqenh, pap & |
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, paph, ldland, pgeoh, kcbot, kctop, lddraf, kdtop & |
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, ktype, ldcum, pmfu, pmfd, pmfus, pmfds & |
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, pmfuq, pmfdq, pmful, plude, pdmfup, pdmfdp & |
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, pten, prfl, psfl, pdpmel, ktopm2 & |
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, pmflxr, pmflxs) |
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use dimens_m |
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use dimphy |
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use SUPHEC_M |
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use yoethf_m |
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use fcttre |
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use yoecumf |
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IMPLICIT none |
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!---------------------------------------------------------------------- |
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! THIS ROUTINE DOES THE FINAL CALCULATION OF CONVECTIVE |
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! FLUXES IN THE CLOUD LAYER AND IN THE SUBCLOUD LAYER |
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!---------------------------------------------------------------------- |
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! |
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REAL cevapcu(klev) |
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! ----------------------------------------------------------------- |
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REAL pqen(klon,klev), pqenh(klon,klev), pqsen(klon,klev) |
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REAL pten(klon,klev), ptenh(klon,klev) |
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REAL paph(klon,klev+1), pgeoh(klon,klev) |
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! |
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REAL pap(klon,klev) |
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REAL ztmsmlt, zdelta, zqsat |
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! |
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REAL pmfu(klon,klev), pmfus(klon,klev) |
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REAL pmfd(klon,klev), pmfds(klon,klev) |
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REAL pmfuq(klon,klev), pmful(klon,klev) |
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REAL pmfdq(klon,klev) |
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REAL plude(klon,klev) |
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REAL pdmfup(klon,klev), pdpmel(klon,klev) |
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!jq The variable maxpdmfdp(klon) has been introduced by Olivier Boucher |
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!jq 14/11/00 to fix the problem with the negative precipitation. |
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REAL pdmfdp(klon,klev), maxpdmfdp(klon,klev) |
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REAL prfl(klon), psfl(klon) |
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REAL pmflxr(klon,klev+1), pmflxs(klon,klev+1) |
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INTEGER kcbot(klon), kctop(klon), ktype(klon) |
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LOGICAL ldland(klon), ldcum(klon) |
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INTEGER k, kp, i |
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REAL zcons1, zcons2, zcucov, ztmelp2 |
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REAL, intent(in):: pdtime |
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real zdp, zzp, zfac, zsnmlt, zrfl, zrnew |
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REAL zrmin, zrfln, zdrfl |
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REAL zpds, zpdr, zdenom |
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INTEGER ktopm2, itop, ikb |
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! |
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LOGICAL lddraf(klon) |
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INTEGER kdtop(klon) |
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! |
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! |
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DO 101 k=1,klev |
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CEVAPCU(k)=1.93E-6*261.*SQRT(1.E3/(38.3*0.293) & |
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*SQRT(0.5*(paph(1,k)+paph(1,k+1))/paph(1,klev+1)) ) * 0.5/RG |
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101 CONTINUE |
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! |
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! SPECIFY CONSTANTS |
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! |
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zcons1 = RCPD/(RLMLT*RG*pdtime) |
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zcons2 = 1./(RG*pdtime) |
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zcucov = 0.05 |
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ztmelp2 = RTT + 2. |
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! |
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! DETERMINE FINAL CONVECTIVE FLUXES |
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! |
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itop=klev |
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DO 110 i = 1, klon |
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itop=MIN(itop,kctop(i)) |
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IF (.NOT.ldcum(i) .OR. kdtop(i).LT.kctop(i)) lddraf(i)=.FALSE. |
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IF(.NOT.ldcum(i)) ktype(i)=0 |
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110 CONTINUE |
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! |
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ktopm2=itop-2 |
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DO 120 k=ktopm2,klev |
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DO 115 i = 1, klon |
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IF(ldcum(i).AND.k.GE.kctop(i)-1) THEN |
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pmfus(i,k)=pmfus(i,k)-pmfu(i,k)* & |
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(RCPD*ptenh(i,k)+pgeoh(i,k)) |
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pmfuq(i,k)=pmfuq(i,k)-pmfu(i,k)*pqenh(i,k) |
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zdp = 1.5E4 |
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IF ( ldland(i) ) zdp = 3.E4 |
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! |
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! l'eau liquide detrainee est precipitee quand certaines |
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! conditions sont reunies (sinon, elle est consideree |
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! evaporee dans l'environnement) |
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! |
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IF(paph(i,kcbot(i))-paph(i,kctop(i)).GE.zdp.AND. & |
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pqen(i,k-1).GT.0.8*pqsen(i,k-1)) & |
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pdmfup(i,k-1)=pdmfup(i,k-1)+plude(i,k-1) |
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! |
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IF(lddraf(i).AND.k.GE.kdtop(i)) THEN |
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pmfds(i,k)=pmfds(i,k)-pmfd(i,k)* & |
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(RCPD*ptenh(i,k)+pgeoh(i,k)) |
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pmfdq(i,k)=pmfdq(i,k)-pmfd(i,k)*pqenh(i,k) |
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ELSE |
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pmfd(i,k)=0. |
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pmfds(i,k)=0. |
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pmfdq(i,k)=0. |
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pdmfdp(i,k-1)=0. |
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END IF |
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ELSE |
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pmfu(i,k)=0. |
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pmfus(i,k)=0. |
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pmfuq(i,k)=0. |
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pmful(i,k)=0. |
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pdmfup(i,k-1)=0. |
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plude(i,k-1)=0. |
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pmfd(i,k)=0. |
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pmfds(i,k)=0. |
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pmfdq(i,k)=0. |
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pdmfdp(i,k-1)=0. |
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ENDIF |
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115 CONTINUE |
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120 CONTINUE |
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! |
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DO 130 k=ktopm2,klev |
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DO 125 i = 1, klon |
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IF(ldcum(i).AND.k.GT.kcbot(i)) THEN |
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ikb=kcbot(i) |
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zzp=((paph(i,klev+1)-paph(i,k))/ & |
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(paph(i,klev+1)-paph(i,ikb))) |
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IF (ktype(i).EQ.3) zzp = zzp**2 |
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pmfu(i,k)=pmfu(i,ikb)*zzp |
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pmfus(i,k)=pmfus(i,ikb)*zzp |
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pmfuq(i,k)=pmfuq(i,ikb)*zzp |
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pmful(i,k)=pmful(i,ikb)*zzp |
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ENDIF |
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125 CONTINUE |
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130 CONTINUE |
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! |
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! CALCULATE RAIN/SNOW FALL RATES |
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! CALCULATE MELTING OF SNOW |
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! CALCULATE EVAPORATION OF PRECIP |
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! |
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DO k = 1, klev+1 |
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DO i = 1, klon |
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pmflxr(i,k) = 0.0 |
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pmflxs(i,k) = 0.0 |
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ENDDO |
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ENDDO |
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DO k = ktopm2, klev |
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DO i = 1, klon |
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IF (ldcum(i)) THEN |
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IF (pmflxs(i,k).GT.0.0 .AND. pten(i,k).GT.ztmelp2) THEN |
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zfac=zcons1*(paph(i,k+1)-paph(i,k)) |
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zsnmlt=MIN(pmflxs(i,k),zfac*(pten(i,k)-ztmelp2)) |
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pdpmel(i,k)=zsnmlt |
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ztmsmlt=pten(i,k)-zsnmlt/zfac |
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zdelta=MAX(0.,SIGN(1.,RTT-ztmsmlt)) |
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zqsat=R2ES*FOEEW(ztmsmlt, zdelta) / pap(i,k) |
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zqsat=MIN(0.5,zqsat) |
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zqsat=zqsat/(1.-RETV *zqsat) |
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pqsen(i,k) = zqsat |
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ENDIF |
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IF (pten(i,k).GT.RTT) THEN |
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pmflxr(i,k+1)=pmflxr(i,k)+pdmfup(i,k)+pdmfdp(i,k)+pdpmel(i,k) |
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pmflxs(i,k+1)=pmflxs(i,k)-pdpmel(i,k) |
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ELSE |
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pmflxs(i,k+1)=pmflxs(i,k)+pdmfup(i,k)+pdmfdp(i,k) |
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pmflxr(i,k+1)=pmflxr(i,k) |
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ENDIF |
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! si la precipitation est negative, on ajuste le plux du |
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! panache descendant pour eliminer la negativite |
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IF ((pmflxr(i,k+1)+pmflxs(i,k+1)).LT.0.0) THEN |
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pdmfdp(i,k) = -pmflxr(i,k)-pmflxs(i,k)-pdmfup(i,k) |
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pmflxr(i,k+1) = 0.0 |
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pmflxs(i,k+1) = 0.0 |
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pdpmel(i,k) = 0.0 |
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ENDIF |
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ENDIF |
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ENDDO |
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ENDDO |
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! |
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!jq The new variable is initialized here. |
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!jq It contains the humidity which is fed to the downdraft |
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!jq by evaporation of precipitation in the column below the base |
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!jq of convection. |
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!jq |
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!jq In the former version, this term has been subtracted from precip |
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!jq as well as the evaporation. |
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!jq |
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DO k = 1, klev |
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DO i = 1, klon |
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maxpdmfdp(i,k)=0.0 |
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ENDDO |
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ENDDO |
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DO k = 1, klev |
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DO kp = k, klev |
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DO i = 1, klon |
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maxpdmfdp(i,k)=maxpdmfdp(i,k)+pdmfdp(i,kp) |
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ENDDO |
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ENDDO |
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ENDDO |
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!jq End of initialization |
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! |
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DO k = ktopm2, klev |
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DO i = 1, klon |
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IF (ldcum(i) .AND. k.GE.kcbot(i)) THEN |
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zrfl = pmflxr(i,k) + pmflxs(i,k) |
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IF (zrfl.GT.1.0E-20) THEN |
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zrnew=(MAX(0.,SQRT(zrfl/zcucov)- & |
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CEVAPCU(k)*(paph(i,k+1)-paph(i,k))* & |
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MAX(0.,pqsen(i,k)-pqen(i,k))))**2*zcucov |
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zrmin=zrfl-zcucov*MAX(0.,0.8*pqsen(i,k)-pqen(i,k)) & |
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*zcons2*(paph(i,k+1)-paph(i,k)) |
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zrnew=MAX(zrnew,zrmin) |
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zrfln=MAX(zrnew,0.) |
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zdrfl=MIN(0.,zrfln-zrfl) |
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!jq At least the amount of precipiation needed to feed the downdraft |
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!jq with humidity below the base of convection has to be left and can't |
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!jq be evaporated (surely the evaporation can't be positive): |
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zdrfl=MAX(zdrfl, & |
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MIN(-pmflxr(i,k)-pmflxs(i,k)-maxpdmfdp(i,k),0.0)) |
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!jq End of insertion |
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! |
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zdenom=1.0/MAX(1.0E-20,pmflxr(i,k)+pmflxs(i,k)) |
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IF (pten(i,k).GT.RTT) THEN |
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zpdr = pdmfdp(i,k) |
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zpds = 0.0 |
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ELSE |
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zpdr = 0.0 |
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zpds = pdmfdp(i,k) |
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ENDIF |
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pmflxr(i,k+1) = pmflxr(i,k) + zpdr + pdpmel(i,k) & |
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+ zdrfl*pmflxr(i,k)*zdenom |
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pmflxs(i,k+1) = pmflxs(i,k) + zpds - pdpmel(i,k) & |
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+ zdrfl*pmflxs(i,k)*zdenom |
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pdmfup(i,k) = pdmfup(i,k) + zdrfl |
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ELSE |
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pmflxr(i,k+1) = 0.0 |
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pmflxs(i,k+1) = 0.0 |
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pdmfdp(i,k) = 0.0 |
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pdpmel(i,k) = 0.0 |
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ENDIF |
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if (pmflxr(i,k) + pmflxs(i,k).lt.-1.e-26) & |
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write(*,*) 'precip. < 1e-16 ',pmflxr(i,k) + pmflxs(i,k) |
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ENDIF |
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ENDDO |
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ENDDO |
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! |
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DO 210 i = 1, klon |
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prfl(i) = pmflxr(i,klev+1) |
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psfl(i) = pmflxs(i,klev+1) |
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210 CONTINUE |
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! |
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RETURN |
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END |
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