| 1 |
guez |
78 |
module flxdlfs_m |
| 2 |
|
|
|
| 3 |
|
|
IMPLICIT none |
| 4 |
|
|
|
| 5 |
|
|
contains |
| 6 |
|
|
|
| 7 |
|
|
SUBROUTINE flxdlfs(ptenh, pqenh, pgeoh, paph, ptu, pqu, ldcum, kcbot, & |
| 8 |
|
|
kctop, pmfub, prfl, ptd, pqd, pmfd, pmfds, pmfdq, pdmfdp, kdtop, lddraf) |
| 9 |
|
|
|
| 10 |
|
|
! This routine calculates level of free sinking for cumulus |
| 11 |
|
|
! downdrafts and specifies T, q, u and v values |
| 12 |
|
|
|
| 13 |
|
|
! To produce LFS-values for cumulus downdrafts for massflux |
| 14 |
|
|
! cumulus parameterization |
| 15 |
|
|
|
| 16 |
|
|
! Input are environmental values of T, q, u, v, p, Phi and updraft |
| 17 |
|
|
! values T, q, u and v and also cloud base massflux and |
| 18 |
|
|
! cu-precipitation rate. it returns T, q, u and v values and |
| 19 |
|
|
! massflux at LFS. |
| 20 |
|
|
|
| 21 |
|
|
! Check for negative buoyancy of air of equal parts of moist |
| 22 |
|
|
! environmental air and cloud air. |
| 23 |
|
|
|
| 24 |
|
|
USE dimphy, ONLY: klev, klon |
| 25 |
|
|
USE flxadjtq_m, ONLY: flxadjtq |
| 26 |
|
|
USE suphec_m, ONLY: rcpd, retv |
| 27 |
|
|
USE yoecumf, ONLY: cmfdeps |
| 28 |
|
|
|
| 29 |
|
|
REAL ptenh(klon, klev) |
| 30 |
|
|
REAL pqenh(klon, klev) |
| 31 |
|
|
REAL, intent(in):: pgeoh(klon, klev), paph(klon, klev + 1) |
| 32 |
|
|
REAL ptu(klon, klev), pqu(klon, klev) |
| 33 |
|
|
LOGICAL ldcum(klon) |
| 34 |
|
|
INTEGER kcbot(klon), kctop(klon) |
| 35 |
|
|
REAL pmfub(klon) |
| 36 |
|
|
REAL prfl(klon) |
| 37 |
|
|
REAL ptd(klon, klev), pqd(klon, klev) |
| 38 |
|
|
REAL pmfd(klon, klev), pmfds(klon, klev), pmfdq(klon, klev) |
| 39 |
|
|
REAL pdmfdp(klon, klev) |
| 40 |
|
|
INTEGER kdtop(klon) |
| 41 |
|
|
LOGICAL lddraf(klon) |
| 42 |
|
|
|
| 43 |
|
|
! Local: |
| 44 |
|
|
REAL ztenwb(klon, klev), zqenwb(klon, klev), zcond(klon) |
| 45 |
|
|
REAL zttest, zqtest, zbuo, zmftop |
| 46 |
|
|
LOGICAL llo2(klon) |
| 47 |
|
|
INTEGER i, k, is, icall |
| 48 |
|
|
|
| 49 |
|
|
!---------------------------------------------------------------------- |
| 50 |
|
|
|
| 51 |
|
|
DO i= 1, klon |
| 52 |
|
|
lddraf(i)=.FALSE. |
| 53 |
|
|
kdtop(i)=klev + 1 |
| 54 |
|
|
ENDDO |
| 55 |
|
|
|
| 56 |
|
|
! DETERMINE LEVEL OF FREE SINKING BY |
| 57 |
|
|
! DOING A SCAN FROM TOP TO BASE OF CUMULUS CLOUDS |
| 58 |
|
|
|
| 59 |
|
|
! FOR EVERY POINT AND PROCEED AS FOLLOWS: |
| 60 |
|
|
! (1) DETEMINE WET BULB ENVIRONMENTAL T AND Q |
| 61 |
|
|
! (2) DO MIXING WITH CUMULUS CLOUD AIR |
| 62 |
|
|
! (3) CHECK FOR NEGATIVE BUOYANCY |
| 63 |
|
|
|
| 64 |
|
|
! THE ASSUMPTION IS THAT AIR OF DOWNDRAFTS IS MIXTURE |
| 65 |
|
|
! OF 50% CLOUD AIR + 50% ENVIRONMENTAL AIR AT WET BULB |
| 66 |
|
|
! TEMPERATURE (I.E. WHICH BECAME SATURATED DUE TO |
| 67 |
|
|
! EVAPORATION OF RAIN AND CLOUD WATER) |
| 68 |
|
|
|
| 69 |
|
|
DO k = 3, klev-3 |
| 70 |
|
|
is=0 |
| 71 |
|
|
DO i= 1, klon |
| 72 |
|
|
ztenwb(i, k)=ptenh(i, k) |
| 73 |
|
|
zqenwb(i, k)=pqenh(i, k) |
| 74 |
|
|
llo2(i) = ldcum(i).AND.prfl(i).GT.0. & |
| 75 |
|
|
.AND..NOT.lddraf(i) & |
| 76 |
|
|
.AND.(k.LT.kcbot(i).AND.k.GT.kctop(i)) |
| 77 |
|
|
IF ( llo2(i) ) is = is + 1 |
| 78 |
|
|
end DO |
| 79 |
|
|
IF(is.EQ.0) cycle |
| 80 |
|
|
|
| 81 |
|
|
icall=2 |
| 82 |
|
|
CALL flxadjtq(paph(:, k), ztenwb(1, k), zqenwb(1, k), llo2, icall) |
| 83 |
|
|
|
| 84 |
|
|
! DO MIXING OF CUMULUS AND ENVIRONMENTAL AIR |
| 85 |
|
|
! AND CHECK FOR NEGATIVE BUOYANCY. |
| 86 |
|
|
! THEN SET VALUES FOR DOWNDRAFT AT LFS. |
| 87 |
|
|
|
| 88 |
|
|
DO i= 1, klon |
| 89 |
|
|
IF (llo2(i)) THEN |
| 90 |
|
|
zttest=0.5*(ptu(i, k) + ztenwb(i, k)) |
| 91 |
|
|
zqtest=0.5*(pqu(i, k) + zqenwb(i, k)) |
| 92 |
|
|
zbuo=zttest*(1. + RETV*zqtest)- & |
| 93 |
|
|
ptenh(i, k)*(1. + RETV *pqenh(i, k)) |
| 94 |
|
|
zcond(i)=pqenh(i, k)-zqenwb(i, k) |
| 95 |
|
|
zmftop=-CMFDEPS*pmfub(i) |
| 96 |
|
|
IF (zbuo.LT.0..AND.prfl(i).GT.10.*zmftop*zcond(i)) THEN |
| 97 |
|
|
kdtop(i)=k |
| 98 |
|
|
lddraf(i)=.TRUE. |
| 99 |
|
|
ptd(i, k)=zttest |
| 100 |
|
|
pqd(i, k)=zqtest |
| 101 |
|
|
pmfd(i, k)=zmftop |
| 102 |
|
|
pmfds(i, k)=pmfd(i, k)*(RCPD*ptd(i, k) + pgeoh(i, k)) |
| 103 |
|
|
pmfdq(i, k)=pmfd(i, k)*pqd(i, k) |
| 104 |
|
|
pdmfdp(i, k-1)=-0.5*pmfd(i, k)*zcond(i) |
| 105 |
|
|
prfl(i)=prfl(i) + pdmfdp(i, k-1) |
| 106 |
|
|
ENDIF |
| 107 |
|
|
ENDIF |
| 108 |
|
|
end DO |
| 109 |
|
|
end DO |
| 110 |
|
|
|
| 111 |
|
|
END SUBROUTINE flxdlfs |
| 112 |
|
|
|
| 113 |
|
|
end module flxdlfs_m |
Parent Directory
| 
Revision Log