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guez |
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module flxflux_m |
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IMPLICIT none |
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contains |
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SUBROUTINE flxflux(pdtime, pqen, pqsen, ptenh, pqenh, pap, paph, ldland, & |
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guez |
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pgeoh, kcbot, kctop, lddraf, kdtop, ktype, ldcum, mfu, pmfd, mfus, & |
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pmfds, mfuq, pmfdq, mful, plude, pdmfup, pdmfdp, pten, prfl, psfl, & |
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guez |
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pdpmel, ktopm2, pmflxr, pmflxs) |
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! This routine does the final calculation of convective fluxes in |
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! the cloud layer and in the subcloud layer. |
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USE dimphy, ONLY: klev, klon |
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USE suphec_m, ONLY: rcpd, retv, rg, rlmlt, rtt |
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USE yoethf_m, ONLY: r2es |
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USE fcttre, ONLY: foeew |
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REAL, intent(in):: pdtime |
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REAL, intent(in):: pqen(klon, klev) |
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real, intent(inout):: pqsen(klon, klev) |
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REAL, intent(in):: ptenh(klon, klev) |
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REAL, intent(in):: pqenh(klon, klev) |
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guez |
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REAL, intent(in):: pap(klon, klev) |
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REAL, intent(in):: paph(klon, klev + 1) |
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guez |
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LOGICAL ldland(klon) |
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real pgeoh(klon, klev) |
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INTEGER, intent(in):: kcbot(klon), kctop(klon) |
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LOGICAL lddraf(klon) |
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INTEGER kdtop(klon) |
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INTEGER, intent(inout):: ktype(klon) |
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LOGICAL, intent(in):: ldcum(klon) |
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guez |
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REAL mfu(klon, klev) |
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guez |
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REAL pmfd(klon, klev) |
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guez |
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real, intent(inout):: mfus(klon, klev) |
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guez |
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real pmfds(klon, klev) |
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guez |
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REAL mfuq(klon, klev) |
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guez |
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REAL pmfdq(klon, klev) |
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guez |
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real mful(klon, klev) |
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guez |
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REAL plude(klon, klev) |
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REAL pdmfup(klon, klev) |
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REAL pdmfdp(klon, klev) |
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REAL, intent(in):: pten(klon, klev) |
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REAL prfl(klon), psfl(klon) |
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real pdpmel(klon, klev) |
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INTEGER, intent(out):: ktopm2 |
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guez |
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REAL pmflxr(klon, klev + 1), pmflxs(klon, klev + 1) |
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guez |
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! Local: |
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REAL cevapcu(klev) |
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REAL ztmsmlt, zdelta, zqsat |
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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 maxpdmfdp(klon, klev) |
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INTEGER k, kp, i |
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REAL zcons1, zcons2, zcucov, ztmelp2 |
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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 ikb |
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!--------------------------------------------------------------- |
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DO k=1, klev |
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CEVAPCU(k)=1.93E-6*261.*SQRT(1.E3/(38.3*0.293) & |
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guez |
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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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guez |
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end DO |
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! SPECIFY CONSTANTS |
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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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! DETERMINE FINAL CONVECTIVE FLUXES |
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DO i = 1, klon |
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IF (.NOT. ldcum(i) .OR. kdtop(i) < kctop(i)) lddraf(i)=.FALSE. |
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IF (.NOT. ldcum(i)) ktype(i) = 0 |
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end DO |
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ktopm2 = min(klev, minval(kctop)) - 2 |
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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 >= kctop(i) - 1) THEN |
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guez |
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mfus(i, k) = mfus(i, k) & |
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- mfu(i, k) * (RCPD * ptenh(i, k) + pgeoh(i, k)) |
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mfuq(i, k)=mfuq(i, k)-mfu(i, k)*pqenh(i, k) |
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guez |
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zdp = 1.5E4 |
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IF (ldland(i)) zdp = 3.E4 |
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! L'eau liquide détrainée est precipitée quand certaines |
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! conditions sont réunies (sinon, elle est considérée |
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! évaporée dans l'environnement) |
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IF (paph(i, kcbot(i)) - paph(i, kctop(i)) >= zdp & |
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.AND. pqen(i, k - 1) > 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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IF (lddraf(i).AND.k >= 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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guez |
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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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mfu(i, k)=0. |
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mfus(i, k)=0. |
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mfuq(i, k)=0. |
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mful(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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end DO |
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end DO |
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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 > 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) == 3) zzp = zzp**2 |
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mfu(i, k)=mfu(i, ikb)*zzp |
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mfus(i, k)=mfus(i, ikb)*zzp |
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mfuq(i, k)=mfuq(i, ikb)*zzp |
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mful(i, k)=mful(i, ikb)*zzp |
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guez |
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ENDIF |
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end DO |
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end DO |
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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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guez |
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DO k = 1, klev + 1 |
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guez |
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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) > 0.0 .AND. pten(i, k) > ztmelp2) THEN |
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guez |
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zfac=zcons1*(paph(i, k + 1)-paph(i, k)) |
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guez |
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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) > RTT) THEN |
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pmflxr(i, k + 1) = pmflxr(i, k) + pdmfup(i, k) + pdmfdp(i, k) & |
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+ pdpmel(i, k) |
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guez |
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pmflxs(i, k + 1)=pmflxs(i, k)-pdpmel(i, k) |
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guez |
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ELSE |
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guez |
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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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guez |
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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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guez |
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IF ((pmflxr(i, k + 1) + pmflxs(i, k + 1)) < 0.0) THEN |
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guez |
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pdmfdp(i, k) = -pmflxr(i, k)-pmflxs(i, k)-pdmfup(i, k) |
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guez |
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pmflxr(i, k + 1) = 0.0 |
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pmflxs(i, k + 1) = 0.0 |
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guez |
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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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! The new variable is initialized here. It contains the |
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! humidity which is fed to the downdraft by evaporation of |
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! precipitation in the column below the base of convection. |
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! In the former version, this term has been subtracted from precip |
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! as well as the evaporation. |
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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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guez |
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DO kp = k, klev |
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guez |
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DO i = 1, klon |
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guez |
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maxpdmfdp(i, k)=maxpdmfdp(i, k) + pdmfdp(i, kp) |
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guez |
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ENDDO |
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guez |
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ENDDO |
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guez |
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ENDDO |
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! End of initialization |
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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 >= kcbot(i)) THEN |
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zrfl = pmflxr(i, k) + pmflxs(i, k) |
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IF (zrfl > 1.0E-20) THEN |
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zrnew = (MAX(0., SQRT(zrfl / zcucov) - CEVAPCU(k) & |
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* (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 & |
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* 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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! At least the amount of precipiation needed to feed |
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! the downdraft with humidity below the base of |
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! convection has to be left and can't be evaporated |
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! (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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guez |
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zdenom=1.0/MAX(1.0E-20, pmflxr(i, k) + pmflxs(i, k)) |
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guez |
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IF (pten(i, k) > 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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guez |
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pmflxr(i, k + 1) = pmflxr(i, k) + zpdr + pdpmel(i, k) & |
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guez |
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+ zdrfl*pmflxr(i, k)*zdenom |
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guez |
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pmflxs(i, k + 1) = pmflxs(i, k) + zpds - pdpmel(i, k) & |
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guez |
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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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guez |
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pmflxr(i, k + 1) = 0.0 |
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pmflxs(i, k + 1) = 0.0 |
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guez |
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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) < -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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DO i = 1, klon |
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guez |
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prfl(i) = pmflxr(i, klev + 1) |
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psfl(i) = pmflxs(i, klev + 1) |
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guez |
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end DO |
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RETURN |
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END SUBROUTINE flxflux |
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end module flxflux_m |
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