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module flxdlfs_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 flxdlfs(ptenh, pqenh, pgeoh, paph, ptu, pqu, ldcum, kcbot, & |
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kctop, pmfub, prfl, ptd, pqd, pmfd, pmfds, pmfdq, pdmfdp, kdtop, lddraf) |
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|
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! This routine calculates level of free sinking for cumulus |
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! downdrafts and specifies T, q, u and v values |
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|
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! To produce LFS-values for cumulus downdrafts for massflux |
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! cumulus parameterization |
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|
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! Input are environmental values of T, q, u, v, p, Phi and updraft |
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! values T, q, u and v and also cloud base massflux and |
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! cu-precipitation rate. it returns T, q, u and v values and |
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! massflux at LFS. |
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|
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! Check for negative buoyancy of air of equal parts of moist |
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! environmental air and cloud air. |
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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, retv |
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USE yoecumf, ONLY: cmfdeps |
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|
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REAL ptenh(klon, klev) |
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REAL pqenh(klon, klev) |
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REAL, intent(in):: pgeoh(klon, klev), paph(klon, klev + 1) |
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REAL ptu(klon, klev), pqu(klon, klev) |
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LOGICAL ldcum(klon) |
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INTEGER kcbot(klon), kctop(klon) |
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REAL pmfub(klon) |
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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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INTEGER kdtop(klon) |
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LOGICAL lddraf(klon) |
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|
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! Local: |
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REAL ztenwb(klon, klev), zqenwb(klon, klev), zcond(klon) |
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REAL zttest, zqtest, zbuo, zmftop |
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LOGICAL llo2(klon) |
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INTEGER i, k, is, icall |
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|
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!---------------------------------------------------------------------- |
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|
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DO i= 1, klon |
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lddraf(i)=.FALSE. |
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kdtop(i)=klev + 1 |
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ENDDO |
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|
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! DETERMINE LEVEL OF FREE SINKING BY |
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! DOING A SCAN FROM TOP TO BASE OF CUMULUS CLOUDS |
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|
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! FOR EVERY POINT AND PROCEED AS FOLLOWS: |
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! (1) DETEMINE WET BULB ENVIRONMENTAL T AND Q |
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! (2) DO MIXING WITH CUMULUS CLOUD AIR |
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! (3) CHECK FOR NEGATIVE BUOYANCY |
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|
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! THE ASSUMPTION IS THAT AIR OF DOWNDRAFTS IS MIXTURE |
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! OF 50% CLOUD AIR + 50% ENVIRONMENTAL AIR AT WET BULB |
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! TEMPERATURE (I.E. WHICH BECAME SATURATED DUE TO |
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! EVAPORATION OF RAIN AND CLOUD WATER) |
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|
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DO k = 3, klev-3 |
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is=0 |
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DO i= 1, klon |
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ztenwb(i, k)=ptenh(i, k) |
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zqenwb(i, k)=pqenh(i, k) |
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llo2(i) = ldcum(i).AND.prfl(i).GT.0. & |
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.AND..NOT.lddraf(i) & |
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.AND.(k.LT.kcbot(i).AND.k.GT.kctop(i)) |
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IF ( llo2(i) ) is = is + 1 |
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end DO |
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IF(is.EQ.0) cycle |
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|
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icall=2 |
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CALL flxadjtq(paph(:, k), ztenwb(1, k), zqenwb(1, k), llo2, icall) |
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|
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! DO MIXING OF CUMULUS AND ENVIRONMENTAL AIR |
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! AND CHECK FOR NEGATIVE BUOYANCY. |
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! THEN SET VALUES FOR DOWNDRAFT AT LFS. |
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|
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DO i= 1, klon |
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IF (llo2(i)) THEN |
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zttest=0.5*(ptu(i, k) + ztenwb(i, k)) |
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zqtest=0.5*(pqu(i, k) + zqenwb(i, k)) |
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zbuo=zttest*(1. + RETV*zqtest)- & |
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ptenh(i, k)*(1. + RETV *pqenh(i, k)) |
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zcond(i)=pqenh(i, k)-zqenwb(i, k) |
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zmftop=-CMFDEPS*pmfub(i) |
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IF (zbuo.LT.0..AND.prfl(i).GT.10.*zmftop*zcond(i)) THEN |
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kdtop(i)=k |
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lddraf(i)=.TRUE. |
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ptd(i, k)=zttest |
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pqd(i, k)=zqtest |
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pmfd(i, k)=zmftop |
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pmfds(i, k)=pmfd(i, k)*(RCPD*ptd(i, k) + pgeoh(i, k)) |
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pmfdq(i, k)=pmfd(i, k)*pqd(i, k) |
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pdmfdp(i, k-1)=-0.5*pmfd(i, k)*zcond(i) |
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prfl(i)=prfl(i) + pdmfdp(i, k-1) |
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ENDIF |
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ENDIF |
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end DO |
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end DO |
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|
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END SUBROUTINE flxdlfs |
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|
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end module flxdlfs_m |
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