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SUBROUTINE flxdlfs(ptenh, pqenh, pgeoh, paph, ptu, pqu, & |
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ldcum, kcbot, kctop, pmfub, prfl, ptd, pqd, & |
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pmfd, pmfds, pmfdq, pdmfdp, kdtop, lddraf) |
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use dimens_m |
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use dimphy |
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use flxadjtq_m, only: flxadjtq |
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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 LEVEL OF FREE SINKING FOR |
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! CUMULUS DOWNDRAFTS AND SPECIFIES T,Q,U AND V VALUES |
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! |
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! TO PRODUCE LFS-VALUES FOR CUMULUS DOWNDRAFTS |
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! FOR MASSFLUX CUMULUS PARAMETERIZATION |
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! |
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! INPUT ARE ENVIRONMENTAL VALUES OF T,Q,U,V,P,PHI |
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! AND UPDRAFT VALUES T,Q,U AND V AND ALSO |
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! CLOUD BASE MASSFLUX AND CU-PRECIPITATION RATE. |
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! IT RETURNS T,Q,U AND V VALUES AND MASSFLUX AT LFS. |
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! |
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! CHECK FOR NEGATIVE BUOYANCY OF AIR OF EQUAL PARTS OF |
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! MOIST ENVIRONMENTAL AIR AND CLOUD AIR. |
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!---------------------------------------------------------------------- |
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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 pgeoh(klon,klev), paph(klon,klev+1) |
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REAL ptu(klon,klev), pqu(klon,klev) |
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REAL pmfub(klon) |
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REAL prfl(klon) |
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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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INTEGER kcbot(klon), kctop(klon), kdtop(klon) |
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LOGICAL ldcum(klon), lddraf(klon) |
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! |
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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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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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!---------------------------------------------------------------------- |
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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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! |
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DO 290 k = 3, klev-3 |
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! |
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is=0 |
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DO 212 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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212 CONTINUE |
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IF(is.EQ.0) GO TO 290 |
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! |
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icall=2 |
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CALL flxadjtq(paph(1,k), ztenwb(1,k), zqenwb(1,k), llo2, icall) |
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! |
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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 222 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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222 CONTINUE |
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! |
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290 CONTINUE |
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! |
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RETURN |
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END |
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