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module coefcdrag_m |
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IMPLICIT none |
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contains |
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SUBROUTINE coefcdrag (klon, knon, nsrf, zxli, & |
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speed, t, q, zgeop, psol, & |
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ts, qsurf, rugos, okri, ri1, & |
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cdram, cdrah, cdran, zri1, pref) |
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! From LMDZ4/libf/phylmd/coefcdrag.F90,v 1.1.1.1 2004/05/19 12:53:07 |
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use indicesol |
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use SUPHEC_M |
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use yoethf_m |
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!------------------------------------------------------------------------- |
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! Objet : calcul des cdrags pour le moment (cdram) et les flux de chaleur |
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! sensible et latente (cdrah), du cdrag neutre (cdran), |
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! du nombre de Richardson entre la surface et le niveau de reference |
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! (zri1) et de la pression au niveau de reference (pref). |
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! |
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! I. Musat, 01.07.2002 |
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!------------------------------------------------------------------------- |
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! |
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! klon----input-I- dimension de la grille physique (= nb_pts_latitude X nb_pts_longitude) |
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! knon----input-I- nombre de points pour un type de surface |
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! nsrf----input-I- indice pour le type de surface; voir indicesol.inc |
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! zxli----input-L- TRUE si calcul des cdrags selon Laurent Li |
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! speed---input-R- module du vent au 1er niveau du modele |
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! t-------input-R- temperature de l'air au 1er niveau du modele |
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! q-------input-R- humidite de l'air au 1er niveau du modele |
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! zgeop---input-R- geopotentiel au 1er niveau du modele |
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! psol----input-R- pression au sol |
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! ts------input-R- temperature de l'air a la surface |
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! qsurf---input-R- humidite de l'air a la surface |
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! rugos---input-R- rugosite |
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! okri----input-L- TRUE si on veut tester le nb. Richardson entre la sfce |
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! et zref par rapport au Ri entre la sfce et la 1ere couche |
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! ri1-----input-R- nb. Richardson entre la surface et la 1ere couche |
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! |
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! cdram--output-R- cdrag pour le moment |
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! cdrah--output-R- cdrag pour les flux de chaleur latente et sensible |
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! cdran--output-R- cdrag neutre |
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! zri1---output-R- nb. Richardson entre la surface et la couche zgeop/RG |
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! pref---output-R- pression au niveau zgeop/RG |
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! |
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INTEGER, intent(in) :: klon, knon, nsrf |
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LOGICAL, intent(in) :: zxli |
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REAL, dimension(klon), intent(in) :: speed, t, q, zgeop, psol |
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REAL, dimension(klon), intent(in) :: ts, qsurf, rugos, ri1 |
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LOGICAL, intent(in) :: okri |
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! |
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REAL, dimension(klon), intent(out) :: cdram, cdrah, cdran, zri1, pref |
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!------------------------------------------------------------------------- |
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! |
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! Quelques constantes : |
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REAL, parameter :: RKAR=0.40, CB=5.0, CC=5.0, CD=5.0 |
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! |
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! Variables locales : |
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INTEGER :: i |
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REAL, dimension(klon) :: zdu2, zdphi, ztsolv, ztvd |
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REAL, dimension(klon) :: zscf, friv, frih, zucf, zcr |
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REAL, dimension(klon) :: zcfm1, zcfh1 |
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REAL, dimension(klon) :: zcfm2, zcfh2 |
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REAL, dimension(klon) :: trm0, trm1 |
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!------------------------------------------------------------------------- |
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! |
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DO i = 1, knon |
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zdphi(i) = zgeop(i) |
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zdu2(i) = speed(i)**2 |
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pref(i) = exp(log(psol(i)) - zdphi(i)/(RD*t(i)* & |
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(1.+ RETV * max(q(i),0.0)))) |
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ztsolv(i) = ts(i) |
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ztvd(i) = t(i) * (psol(i)/pref(i))**RKAPPA |
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trm0(i) = 1. + RETV * max(qsurf(i),0.0) |
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trm1(i) = 1. + RETV * max(q(i),0.0) |
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ztsolv(i) = ztsolv(i) * trm0(i) |
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ztvd(i) = ztvd(i) * trm1(i) |
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zri1(i) = zdphi(i)*(ztvd(i)-ztsolv(i))/(zdu2(i)*ztvd(i)) |
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! |
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! on teste zri1 par rapport au Richardson de la 1ere couche ri1 |
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! |
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!IM +++ |
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IF(1.EQ.0) THEN |
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IF (okri) THEN |
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IF (ri1(i).GE.0.0.AND.zri1(i).LT.0.0) THEN |
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zri1(i) = ri1(i) |
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ELSE IF(ri1(i).LT.0.0.AND.zri1(i).GE.0.0) THEN |
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zri1(i) = ri1(i) |
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ENDIF |
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ENDIF |
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ENDIF |
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!IM --- |
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cdran(i) = (RKAR/log(1.+zdphi(i)/(RG*rugos(i))))**2 |
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IF (zri1(i) .ge. 0.) THEN |
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! |
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! situation stable : pour eviter les inconsistances dans les cas |
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! tres stables on limite zri1 a 20. cf Hess et al. (1995) |
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! |
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zri1(i) = min(20.,zri1(i)) |
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! |
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IF (.NOT.zxli) THEN |
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zscf(i) = SQRT(1.+CD*ABS(zri1(i))) |
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friv(i) = max(1. / (1.+2.*CB*zri1(i)/ zscf(i)), 0.1) |
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zcfm1(i) = cdran(i) * friv(i) |
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frih(i) = max(1./ (1.+3.*CB*zri1(i)*zscf(i)), 0.1 ) |
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zcfh1(i) = cdran(i) * frih(i) |
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cdram(i) = zcfm1(i) |
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cdrah(i) = zcfh1(i) |
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ELSE |
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cdram(i) = cdran(i)* fsta(zri1(i)) |
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cdrah(i) = cdran(i)* fsta(zri1(i)) |
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ENDIF |
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! |
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ELSE |
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! |
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! situation instable |
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! |
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IF (.NOT.zxli) THEN |
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zucf(i) = 1./(1.+3.0*CB*CC*cdran(i)*SQRT(ABS(zri1(i)) & |
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*(1.0+zdphi(i)/(RG*rugos(i))))) |
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zcfm2(i) = cdran(i)*max((1.-2.0*CB*zri1(i)*zucf(i)),0.1) |
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zcfh2(i) = cdran(i)*max((1.-3.0*CB*zri1(i)*zucf(i)),0.1) |
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cdram(i) = zcfm2(i) |
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cdrah(i) = zcfh2(i) |
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ELSE |
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cdram(i) = cdran(i)* fins(zri1(i)) |
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cdrah(i) = cdran(i)* fins(zri1(i)) |
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ENDIF |
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! cdrah sur l'ocean cf. Miller et al. (1992) |
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zcr(i) = (0.0016/(cdran(i)*SQRT(zdu2(i))))*ABS(ztvd(i)-ztsolv(i)) & |
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**(1./3.) |
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IF (nsrf.EQ.is_oce) cdrah(i) = cdran(i)*(1.0+zcr(i)**1.25) & |
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**(1./1.25) |
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ENDIF |
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! |
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END DO |
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contains |
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REAL function fsta(x) |
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real x |
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fsta = 1.0 / (1.0+10.0*x*(1+8.0*x)) |
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end function fsta |
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REAL function fins(x) |
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real x |
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fins = SQRT(1.0-18.0*x) |
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end function fins |
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END SUBROUTINE coefcdrag |
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end module coefcdrag_m |
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