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guez |
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SUBROUTINE flxddraf(ptenh, pqenh, pgeoh, paph, prfl, & |
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ptd, pqd, pmfd, pmfds, pmfdq, pdmfdp, & |
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lddraf, pen_d, pde_d) |
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use dimens_m |
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use dimphy |
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guez |
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use flxadjtq_m, only: flxadjtq |
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guez |
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use SUPHEC_M |
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use yoethf_m |
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use yoecumf |
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IMPLICIT none |
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! |
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!---------------------------------------------------------------------- |
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! THIS ROUTINE CALCULATES CUMULUS DOWNDRAFT DESCENT |
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! |
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! TO PRODUCE THE VERTICAL PROFILES FOR CUMULUS DOWNDRAFTS |
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! (I.E. T,Q,U AND V AND FLUXES) |
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! |
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! INPUT IS T,Q,P,PHI,U,V AT HALF LEVELS. |
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! IT RETURNS FLUXES OF S,Q AND EVAPORATION RATE |
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! AND U,V AT LEVELS WHERE DOWNDRAFT OCCURS |
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! |
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! CALCULATE MOIST DESCENT FOR ENTRAINING/DETRAINING PLUME BY |
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! A) MOVING AIR DRY-ADIABATICALLY TO NEXT LEVEL BELOW AND |
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! B) CORRECTING FOR EVAPORATION TO OBTAIN SATURATED STATE. |
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! |
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!---------------------------------------------------------------------- |
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! |
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REAL ptenh(klon,klev), pqenh(klon,klev) |
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REAL pgeoh(klon,klev), paph(klon,klev+1) |
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! |
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REAL ptd(klon,klev), pqd(klon,klev) |
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REAL pmfd(klon,klev), pmfds(klon,klev), pmfdq(klon,klev) |
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REAL pdmfdp(klon,klev) |
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REAL prfl(klon) |
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LOGICAL lddraf(klon) |
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! |
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REAL pen_d(klon,klev), pde_d(klon,klev), zcond(klon) |
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LOGICAL llo2(klon), llo1 |
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INTEGER i, k, is, icall, itopde |
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REAL zentr, zseen, zqeen, zsdde, zqdde, zmfdsk, zmfdqk, zdmfdp |
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REAL zbuo |
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!---------------------------------------------------------------------- |
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! CALCULATE MOIST DESCENT FOR CUMULUS DOWNDRAFT BY |
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! (A) CALCULATING ENTRAINMENT RATES, ASSUMING |
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! LINEAR DECREASE OF MASSFLUX IN PBL |
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! (B) DOING MOIST DESCENT - EVAPORATIVE COOLING |
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! AND MOISTENING IS CALCULATED IN *flxadjtq* |
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! (C) CHECKING FOR NEGATIVE BUOYANCY AND |
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! SPECIFYING FINAL T,Q,U,V AND DOWNWARD FLUXES |
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! |
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DO 180 k = 3, klev |
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! |
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is = 0 |
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DO i = 1, klon |
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llo2(i)=lddraf(i).AND.pmfd(i,k-1).LT.0. |
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IF (llo2(i)) is = is + 1 |
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ENDDO |
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IF (is.EQ.0) GOTO 180 |
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! |
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DO i = 1, klon |
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IF (llo2(i)) THEN |
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zentr = ENTRDD*pmfd(i,k-1)*RD*ptenh(i,k-1)/ & |
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(RG*paph(i,k-1))*(paph(i,k)-paph(i,k-1)) |
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pen_d(i,k) = zentr |
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pde_d(i,k) = zentr |
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ENDIF |
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ENDDO |
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! |
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itopde = klev-2 |
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IF (k.GT.itopde) THEN |
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DO i = 1, klon |
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IF (llo2(i)) THEN |
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pen_d(i,k)=0. |
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pde_d(i,k)=pmfd(i,itopde)* & |
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(paph(i,k)-paph(i,k-1))/(paph(i,klev+1)-paph(i,itopde)) |
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ENDIF |
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ENDDO |
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ENDIF |
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! |
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DO i = 1, klon |
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IF (llo2(i)) THEN |
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pmfd(i,k) = pmfd(i,k-1)+pen_d(i,k)-pde_d(i,k) |
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zseen = (RCPD*ptenh(i,k-1)+pgeoh(i,k-1))*pen_d(i,k) |
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zqeen = pqenh(i,k-1)*pen_d(i,k) |
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zsdde = (RCPD*ptd(i,k-1)+pgeoh(i,k-1))*pde_d(i,k) |
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zqdde = pqd(i,k-1)*pde_d(i,k) |
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zmfdsk = pmfds(i,k-1)+zseen-zsdde |
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zmfdqk = pmfdq(i,k-1)+zqeen-zqdde |
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pqd(i,k) = zmfdqk*(1./MIN(-CMFCMIN,pmfd(i,k))) |
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ptd(i,k) = (zmfdsk*(1./MIN(-CMFCMIN,pmfd(i,k)))- & |
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pgeoh(i,k))/RCPD |
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ptd(i,k) = MIN(400.,ptd(i,k)) |
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ptd(i,k) = MAX(100.,ptd(i,k)) |
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zcond(i) = pqd(i,k) |
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ENDIF |
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ENDDO |
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! |
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icall = 2 |
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CALL flxadjtq(paph(1,k), ptd(1,k), pqd(1,k), llo2, icall) |
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! |
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DO i = 1, klon |
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IF (llo2(i)) THEN |
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zcond(i) = zcond(i)-pqd(i,k) |
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zbuo = ptd(i,k)*(1.+RETV *pqd(i,k))- & |
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ptenh(i,k)*(1.+RETV *pqenh(i,k)) |
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llo1 = zbuo.LT.0..AND.(prfl(i)-pmfd(i,k)*zcond(i).GT.0.) |
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IF (.not.llo1) pmfd(i,k) = 0.0 |
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pmfds(i,k) = (RCPD*ptd(i,k)+pgeoh(i,k))*pmfd(i,k) |
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pmfdq(i,k) = pqd(i,k)*pmfd(i,k) |
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zdmfdp = -pmfd(i,k)*zcond(i) |
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pdmfdp(i,k-1) = zdmfdp |
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prfl(i) = prfl(i)+zdmfdp |
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ENDIF |
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ENDDO |
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! |
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180 CONTINUE |
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RETURN |
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END |
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