| 1 | ! |
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| 2 | ! $Header: /home/cvsroot/LMDZ4/libf/phylmd/clcdrag.F90,v 1.1.1.1 2004/05/19 12:53:07 lmdzadmin Exp $ |
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| 3 | ! |
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| 4 | ! ADAPTATION GCM POUR CP(T) |
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| 5 | SUBROUTINE clcdrag(klon, knon, zxli, & |
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| 6 | zgeop, zri, & |
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| 7 | pcfm, pcfh) |
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| 8 | IMPLICIT NONE |
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| 9 | ! ================================================================= c |
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| 10 | ! |
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| 11 | ! Objet : calcul des cdrags pour le moment (pcfm) et |
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| 12 | ! les flux de chaleur sensible et latente (pcfh). |
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| 13 | ! |
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| 14 | ! ================================================================= c |
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| 15 | ! |
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| 16 | ! klon----input-I- dimension de la grille physique (= nb_pts_latitude X nb_pts_longitude) |
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| 17 | ! knon----input-I- nombre de points pour un type de surface |
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| 18 | ! zxli----input-L- calcul des cdrags selon Laurent Li |
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| 19 | ! zgeop---input-R- geopotentiel au 1er niveau du modele |
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| 20 | ! zri-----input-R- Ridchardson number, premier niveau |
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| 21 | ! |
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| 22 | ! pcfm---output-R- cdrag pour le moment |
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| 23 | ! pcfh---output-R- cdrag pour les flux de chaleur latente et sensible |
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| 24 | ! |
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| 25 | INTEGER, intent(in) :: klon, knon |
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| 26 | LOGICAL, intent(in) :: zxli |
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| 27 | REAL, intent(in), dimension(klon) :: zgeop |
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| 28 | REAL, dimension(klon) :: zri |
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| 29 | REAL, intent(out), dimension(klon) :: pcfm, pcfh |
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| 30 | ! ================================================================= c |
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| 31 | ! |
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| 32 | #include "YOMCST.h" |
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| 33 | #include "clesphys.h" |
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| 34 | ! |
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| 35 | ! Quelques constantes et options: |
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| 36 | ! REAL, PARAMETER :: ckap=0.40, cb=5.0, cc=5.0, cd=5.0,cepdu2=(0.1)**2 |
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| 37 | REAL, PARAMETER :: ckap=0.40, cb=5.0, cc=5.0, cd=5.0 |
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| 38 | ! |
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| 39 | ! Variables locales : |
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| 40 | INTEGER :: i |
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| 41 | REAL :: zdu2, ztsolv, ztvd, zscf |
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| 42 | REAL :: zucf, zcr |
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| 43 | REAL :: friv, frih |
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| 44 | REAL, dimension(klon) :: zcfm1, zcfm2 |
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| 45 | REAL, dimension(klon) :: zcfh1, zcfh2 |
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| 46 | REAL, dimension(klon) :: zcdn |
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| 47 | ! |
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| 48 | ! Fonctions thermodynamiques et fonctions d'instabilite |
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| 49 | REAL :: fsta, fins, x |
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| 50 | fsta(x) = 1.0 / (1.0+10.0*x*(1+8.0*x)) |
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| 51 | fins(x) = SQRT(1.0-18.0*x) |
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| 52 | ! ================================================================= c |
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| 53 | ! |
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| 54 | ! Calculer le frottement au sol (Cdrag) |
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| 55 | ! ADAPTATION GCM POUR CP(T) |
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| 56 | ! |
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| 57 | DO i = 1, knon |
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| 58 | ! |
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| 59 | ! modif VENUS |
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| 60 | zcdn(i) = (ckap/log(1.+zgeop(i)/(RG*z0)))**2 |
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| 61 | ! |
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| 62 | !!$ IF (zri(i) .ge. 0.) THEN ! situation stable |
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| 63 | IF (zri(i) .gt. 0.) THEN ! situation stable |
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| 64 | zri(i) = min(20.,zri(i)) |
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| 65 | IF (.NOT.zxli) THEN |
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| 66 | zscf = SQRT(1.+cd*ABS(zri(i))) |
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| 67 | FRIV = AMAX1(1. / (1.+2.*CB*zri(i)/ZSCF), 0.1) |
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| 68 | zcfm1(i) = zcdn(i) * FRIV |
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| 69 | FRIH = AMAX1(1./ (1.+3.*CB*zri(i)*ZSCF), 0.1 ) |
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| 70 | !!$ PB zcfh1(i) = zcdn(i) * FRIH |
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| 71 | zcfh1(i) = 0.8 * zcdn(i) * FRIH |
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| 72 | pcfm(i) = zcfm1(i) |
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| 73 | pcfh(i) = zcfh1(i) |
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| 74 | ELSE |
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| 75 | pcfm(i) = zcdn(i)* fsta(zri(i)) |
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| 76 | pcfh(i) = zcdn(i)* fsta(zri(i)) |
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| 77 | ENDIF |
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| 78 | ELSE ! situation instable |
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| 79 | IF (.NOT.zxli) THEN |
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| 80 | ! |
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| 81 | ! modif VENUS. zucf = 1./(1.+3.0*cb*cc*zcdn(i)*SQRT(ABS(zri(i)) & |
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| 82 | ! modif VENUS. *(1.0+zgeop(i)/(RG*rugos(i))))) |
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| 83 | zucf = 1./(1.+3.0*cb*cc*zcdn(i)*SQRT(ABS(zri(i)) & |
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| 84 | *(1.0+zgeop(i)/(RG*z0)))) |
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| 85 | ! |
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| 86 | zcfm2(i) = zcdn(i)*amax1((1.-2.0*cb*zri(i)*zucf),0.1) |
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| 87 | !!$PB zcfh2(i) = zcdn(i)*amax1((1.-3.0*cb*zri(i)*zucf),0.1) |
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| 88 | zcfh2(i) = 0.8 * zcdn(i)*amax1((1.-3.0*cb*zri(i)*zucf),0.1) |
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| 89 | pcfm(i) = zcfm2(i) |
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| 90 | pcfh(i) = zcfh2(i) |
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| 91 | ELSE |
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| 92 | pcfm(i) = zcdn(i)* fins(zri(i)) |
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| 93 | pcfh(i) = zcdn(i)* fins(zri(i)) |
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| 94 | ENDIF |
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| 95 | zcr = (0.0016/(zcdn(i)*SQRT(zdu2)))*ABS(ztvd-ztsolv)**(1./3.) |
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| 96 | ENDIF |
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| 97 | END DO |
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| 98 | RETURN |
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| 99 | END SUBROUTINE clcdrag |
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| 100 | |
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