| 1 |
! |
module cdrag_m |
| 2 |
! $Header: /home/cvsroot/LMDZ4/libf/phylmd/clcdrag.F90,v 1.1.1.1 2004/05/19 12:53:07 lmdzadmin Exp $ |
|
| 3 |
! |
IMPLICIT NONE |
| 4 |
SUBROUTINE clcdrag(klon, knon, nsrf, zxli, & |
|
| 5 |
u, v, t, q, zgeop, & |
contains |
| 6 |
ts, qsurf, rugos, & |
|
| 7 |
pcfm, pcfh) |
SUBROUTINE cdrag(nsrf, speed, t, q, zgeop, psol, ts, qsurf, rugos, cdragm, & |
| 8 |
use indicesol |
cdragh, pref) |
| 9 |
use SUPHEC_M |
|
| 10 |
use yoethf_m |
! From LMDZ4/libf/phylmd/clcdrag.F90 and |
| 11 |
IMPLICIT NONE |
! LMDZ4/libf/phylmd/coefcdrag.F90, version 1.1.1.1, 2004/05/19 |
| 12 |
! ================================================================= c |
! 12:53:07 |
| 13 |
! |
|
| 14 |
! Objet : calcul des cdrags pour le moment (pcfm) et |
! Objet : calcul des drag coefficients au sol pour le moment et |
| 15 |
! les flux de chaleur sensible et latente (pcfh). |
! les flux de chaleurs sensible et latente et calcul de la |
| 16 |
! |
! pression au niveau de reference. |
| 17 |
! ================================================================= c |
|
| 18 |
! |
! Ionela MUSAT, July, 1st, 2002 |
| 19 |
! klon----input-I- dimension de la grille physique (= nb_pts_latitude X nb_pts_longitude) |
|
| 20 |
! knon----input-I- nombre de points pour un type de surface |
! Louis, J. F., Tiedtke, M. and Geleyn, J. F., 1982: `A short |
| 21 |
! nsrf----input-I- indice pour le type de surface; voir indicesol.inc |
! history of the operational PBL parametrization at |
| 22 |
! zxli----input-L- calcul des cdrags selon Laurent Li |
! ECMWF'. Workshop on boundary layer parametrization, November |
| 23 |
! u-------input-R- vent zonal au 1er niveau du modele |
! 1981, ECMWF, Reading, England. Page: 19. Equations in Table 1. |
| 24 |
! v-------input-R- vent meridien au 1er niveau du modele |
|
| 25 |
! t-------input-R- temperature de l'air au 1er niveau du modele |
use nr_util, only: assert_eq |
| 26 |
! q-------input-R- humidite de l'air au 1er niveau du modele |
|
| 27 |
! zgeop---input-R- geopotentiel au 1er niveau du modele |
use clesphys, only: f_cdrag_oce, f_cdrag_ter |
| 28 |
! ts------input-R- temperature de l'air a la surface |
use indicesol, only: is_oce |
| 29 |
! qsurf---input-R- humidite de l'air a la surface |
use SUPHEC_M, only: rcpd, rd, retv, rg |
| 30 |
! rugos---input-R- rugosite |
USE yoethf_m, ONLY: rvtmp2 |
| 31 |
! |
|
| 32 |
! pcfm---output-R- cdrag pour le moment |
INTEGER, intent(in):: nsrf ! indice pour le type de surface |
| 33 |
! pcfh---output-R- cdrag pour les flux de chaleur latente et sensible |
|
| 34 |
! |
REAL, intent(in):: speed(:) ! (knon) |
| 35 |
INTEGER, intent(in) :: klon, knon, nsrf |
! norm of the wind at the first model level |
| 36 |
LOGICAL, intent(in) :: zxli |
|
| 37 |
REAL, intent(in), dimension(klon) :: u, v, t, q, zgeop |
REAL, intent(in):: t(:) ! (knon) |
| 38 |
REAL, intent(in), dimension(klon) :: ts, qsurf |
! temperature de l'air au 1er niveau du modele |
| 39 |
REAL, intent(in), dimension(klon) :: rugos |
|
| 40 |
REAL, intent(out), dimension(klon) :: pcfm, pcfh |
REAL, intent(in):: q(:) ! (knon) ! humidite de l'air au 1er niveau du modele |
| 41 |
! ================================================================= c |
|
| 42 |
! |
REAL, intent(in):: zgeop(:) ! (knon) |
| 43 |
! |
! g\'eopotentiel au 1er niveau du mod\`ele |
| 44 |
! Quelques constantes et options: |
|
| 45 |
!!$PB REAL, PARAMETER :: ckap=0.35, cb=5.0, cc=5.0, cd=5.0, cepdu2=(0.1)**2 |
REAL, intent(in) :: psol(:) ! (knon) pression au sol |
| 46 |
REAL, PARAMETER :: ckap=0.40, cb=5.0, cc=5.0, cd=5.0, cepdu2=(0.1)**2 |
REAL, intent(in):: ts(:) ! (knon) temperature de l'air a la surface |
| 47 |
! |
REAL, intent(in):: qsurf(:) ! (knon) humidite de l'air a la surface |
| 48 |
! Variables locales : |
REAL, intent(in):: rugos(:) ! (knon) rugosit\'e |
| 49 |
INTEGER :: i |
REAL, intent(out):: cdragm(:) ! (knon) drag coefficient pour le moment |
| 50 |
REAL :: zdu2, ztsolv, ztvd, zscf |
|
| 51 |
REAL :: zucf, zcr |
REAL, intent(out):: cdragh(:) ! (knon) |
| 52 |
REAL :: friv, frih |
! drag coefficient pour les flux de chaleur latente et sensible |
| 53 |
REAL, dimension(klon) :: zcfm1, zcfm2 |
|
| 54 |
REAL, dimension(klon) :: zcfh1, zcfh2 |
REAL, intent(out), optional:: pref(:) ! (knon) pression au niveau zgeop / RG |
| 55 |
REAL, dimension(klon) :: zcdn |
|
| 56 |
REAL, dimension(klon) :: zri |
! Local: |
| 57 |
! |
|
| 58 |
! Fonctions thermodynamiques et fonctions d'instabilite |
REAL, PARAMETER:: ckap = 0.40, cb = 5., cc = 5., cd = 5., cepdu2 = 0.1**2 |
| 59 |
REAL :: fsta, fins, x |
real, parameter:: f_ri_cd_min = 0.1 |
| 60 |
fsta(x) = 1.0 / (1.0+10.0*x*(1+8.0*x)) |
INTEGER i, knon |
| 61 |
fins(x) = SQRT(1.0-18.0*x) |
REAL zdu2, ztsolv, ztvd, zscf, zucf |
| 62 |
! ================================================================= c |
real zcdn ! drag coefficient neutre |
| 63 |
! |
|
| 64 |
! Calculer le frottement au sol (Cdrag) |
REAL zri |
| 65 |
! |
! nombre de Richardson entre la surface et le niveau de reference |
| 66 |
DO i = 1, knon |
! zgeop / RG |
| 67 |
zdu2 = max(cepdu2,u(i)**2+v(i)**2) |
|
| 68 |
ztsolv = ts(i) * (1.0+RETV*qsurf(i)) |
!------------------------------------------------------------------------- |
| 69 |
ztvd = (t(i)+zgeop(i)/RCPD/(1.+RVTMP2*q(i))) & |
|
| 70 |
*(1.+RETV*q(i)) |
knon = assert_eq([size(speed), size(t), size(q), size(zgeop), size(ts), & |
| 71 |
zri(i) = zgeop(i)*(ztvd-ztsolv)/(zdu2*ztvd) |
size(qsurf), size(rugos), size(cdragm), size(cdragh)], & |
| 72 |
zcdn(i) = (ckap/log(1.+zgeop(i)/(RG*rugos(i))))**2 |
"cdrag knon") |
| 73 |
! |
|
| 74 |
!!$ IF (zri(i) .ge. 0.) THEN ! situation stable |
DO i = 1, knon |
| 75 |
IF (zri(i) .gt. 0.) THEN ! situation stable |
zdu2 = max(cepdu2, speed(i)**2) |
| 76 |
zri(i) = min(20.,zri(i)) |
ztsolv = ts(i) * (1. + RETV * max(qsurf(i), 0.)) |
| 77 |
IF (.NOT.zxli) THEN |
ztvd = (t(i) + zgeop(i) / RCPD / (1. + RVTMP2 * q(i))) & |
| 78 |
zscf = SQRT(1.+cd*ABS(zri(i))) |
* (1. + RETV * q(i)) |
| 79 |
FRIV = AMAX1(1. / (1.+2.*CB*zri(i)/ZSCF), 0.1) |
zri = zgeop(i) * (ztvd - ztsolv) / (zdu2 * ztvd) |
| 80 |
zcfm1(i) = zcdn(i) * FRIV |
zcdn = (ckap / log(1. + zgeop(i) / (RG * rugos(i))))**2 |
| 81 |
FRIH = AMAX1(1./ (1.+3.*CB*zri(i)*ZSCF), 0.1 ) |
|
| 82 |
!!$ PB zcfh1(i) = zcdn(i) * FRIH |
IF (zri > 0.) THEN |
| 83 |
zcfh1(i) = 0.8 * zcdn(i) * FRIH |
! Situation stable. Pour \'eviter les incoh\'erences dans |
| 84 |
pcfm(i) = zcfm1(i) |
! les cas tr\`es stables, on limite zri \`a 20. Cf Hess et |
| 85 |
pcfh(i) = zcfh1(i) |
! al. (1995). |
| 86 |
ELSE |
zri = min(20., zri) |
| 87 |
pcfm(i) = zcdn(i)* fsta(zri(i)) |
zscf = SQRT(1. + cd * ABS(zri)) |
| 88 |
pcfh(i) = zcdn(i)* fsta(zri(i)) |
cdragm(i) = zcdn * max(1. / (1. + 2. * CB * zri / zscf), f_ri_cd_min) |
| 89 |
ENDIF |
cdragh(i) = merge(f_cdrag_oce, f_cdrag_ter, nsrf == is_oce) * zcdn & |
| 90 |
ELSE ! situation instable |
* max(1. / (1. + 3. * CB * zri * zscf), f_ri_cd_min) |
| 91 |
IF (.NOT.zxli) THEN |
ELSE |
| 92 |
zucf = 1./(1.+3.0*cb*cc*zcdn(i)*SQRT(ABS(zri(i)) & |
! situation instable |
| 93 |
*(1.0+zgeop(i)/(RG*rugos(i))))) |
zucf = 1. / (1. + 3. * cb * cc * zcdn & |
| 94 |
zcfm2(i) = zcdn(i)*amax1((1.-2.0*cb*zri(i)*zucf),0.1) |
* SQRT(ABS(zri) * (1. + zgeop(i) / (RG * rugos(i))))) |
| 95 |
!!$PB zcfh2(i) = zcdn(i)*amax1((1.-3.0*cb*zri(i)*zucf),0.1) |
cdragm(i) = zcdn * max((1. - 2. * cb * zri * zucf), f_ri_cd_min) |
| 96 |
zcfh2(i) = 0.8 * zcdn(i)*amax1((1.-3.0*cb*zri(i)*zucf),0.1) |
|
| 97 |
pcfm(i) = zcfm2(i) |
IF (nsrf == is_oce) then |
| 98 |
pcfh(i) = zcfh2(i) |
! Cf. Miller et al. (1992). |
| 99 |
ELSE |
cdragh(i) = f_cdrag_oce * zcdn * (1. + ((0.0016 & |
| 100 |
pcfm(i) = zcdn(i)* fins(zri(i)) |
/ (zcdn * SQRT(zdu2))) * ABS(ztvd - ztsolv)**(1. & |
| 101 |
pcfh(i) = zcdn(i)* fins(zri(i)) |
/ 3.))**1.25)**(1. / 1.25) |
| 102 |
ENDIF |
else |
| 103 |
zcr = (0.0016/(zcdn(i)*SQRT(zdu2)))*ABS(ztvd-ztsolv)**(1./3.) |
cdragh(i) = f_cdrag_ter * zcdn & |
| 104 |
IF(nsrf.EQ.is_oce) pcfh(i) =0.8* zcdn(i)*(1.0+zcr**1.25)**(1./1.25) |
* max((1. - 3. * cb * zri * zucf), f_ri_cd_min) |
| 105 |
ENDIF |
end IF |
| 106 |
END DO |
ENDIF |
| 107 |
RETURN |
END DO |
| 108 |
END SUBROUTINE clcdrag |
|
| 109 |
|
if (present(pref)) & |
| 110 |
|
pref = exp(log(psol) - zgeop / (RD * t * (1. + RETV * max(q, 0.)))) |
| 111 |
|
|
| 112 |
|
END SUBROUTINE cdrag |
| 113 |
|
|
| 114 |
|
end module cdrag_m |
Parent Directory
| 
Revision Log
| 
Patch