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module flxddraf_m |
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|
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IMPLICIT none |
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|
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contains |
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|
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SUBROUTINE flxddraf(ptenh, pqenh, pgeoh, paph, prfl, ptd, pqd, pmfd, pmfds, & |
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pmfdq, pdmfdp, lddraf, pen_d, pde_d) |
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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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USE dimphy, ONLY: klev, klon |
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USE flxadjtq_m, ONLY: flxadjtq |
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USE suphec_m, ONLY: rcpd, rd, retv, rg |
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USE yoecumf, ONLY: cmfcmin, entrdd |
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|
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REAL ptenh(klon, klev), pqenh(klon, klev) |
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REAL, intent(in):: pgeoh(klon, klev), paph(klon, klev + 1) |
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REAL prfl(klon) |
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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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LOGICAL lddraf(klon) |
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REAL pen_d(klon, klev), pde_d(klon, klev) |
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|
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! Local: |
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real 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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!---------------------------------------------------------------------- |
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|
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! Calculate moist descent for cumulus downdraft by |
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|
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! (A) calculating entrainment rates, assuming linear decrease of |
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! massflux in PBL |
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|
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! (B) doing moist descent - evaporative cooling and moistening is |
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! calculated in flxadjtq |
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|
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! (C) checking for negative buoyancy and specifying final T, q, u, |
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! v and downward fluxes |
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|
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DO k = 3, klev |
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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) cycle |
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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) * (paph(i, k) - paph(i, k - 1)) & |
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/ (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(:, 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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end DO |
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|
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END SUBROUTINE flxddraf |
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|
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end module flxddraf_m |
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