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module coefcdrag_m |
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|
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IMPLICIT NONE |
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|
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contains |
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SUBROUTINE coefcdrag (nsrf, speed, t, q, zgeop, psol, ts, qsurf, rugos, & |
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pcfm, pcfh, pref) |
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|
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! From LMDZ4/libf/phylmd/coefcdrag.F90, version 1.1.1.1, 2004/05/19 12:53:07 |
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|
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! Objet : calcul des cdrags pour le moment (pcfm) et les flux de |
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! chaleur sensible et latente (pcfh) et de la pression au niveau |
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! de reference (pref). |
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|
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! I. Musat, 01.07.2002 |
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|
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use indicesol, only: is_oce |
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use nr_util, only: assert_eq |
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use SUPHEC_M, only: rd, retv, rg, rkappa |
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use dimphy, only: klon |
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|
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INTEGER, intent(in) :: nsrf |
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! nsrf----input-I- indice pour le type de surface; voir indicesol.inc |
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REAL, intent(in) :: speed(:), t(:), q(:), zgeop(:), psol(:) ! (knon) |
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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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REAL, dimension(klon), intent(in) :: ts, qsurf, rugos |
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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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|
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REAL, dimension(klon), intent(out) :: pcfm, pcfh |
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! drag coefficients pour le moment et pour les flux de chaleur |
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! latente et sensible |
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|
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REAL, intent(out), optional:: pref(:) ! (knon) pression au niveau zgeop/RG |
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|
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! Local: |
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REAL, parameter :: CKAP=0.40, CB=5.0, CC=5.0, CD=5.0 |
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INTEGER :: i |
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REAL, dimension(klon) :: zdu2, 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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real cdran(klon) ! drag coefficient neutre |
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REAL pref_local(size(speed)) ! (knon) pression au niveau zgeop/RG |
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|
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REAL zri1(klon) |
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! nb. Richardson entre la surface et la couche zgeop/RG |
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! nombre de Richardson entre la surface et le niveau de reference (zri1) |
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|
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!------------------------------------------------------------------------- |
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|
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DO i = 1, size(speed) |
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zdu2(i) = speed(i)**2 |
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pref_local(i) = exp(log(psol(i)) - zgeop(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_local(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) = zgeop(i)*(ztvd(i)-ztsolv(i))/(zdu2(i)*ztvd(i)) |
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cdran(i) = (CKAP/log(1.+zgeop(i)/(RG*rugos(i))))**2 |
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|
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IF (zri1(i) >= 0.) THEN |
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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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zri1(i) = min(20., zri1(i)) |
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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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pcfm(i) = zcfm1(i) |
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pcfh(i) = zcfh1(i) |
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ELSE |
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! situation instable |
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zucf(i) = 1./(1.+3.0*CB*CC*cdran(i)*SQRT(ABS(zri1(i)) & |
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*(1.0+zgeop(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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pcfm(i) = zcfm2(i) |
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pcfh(i) = zcfh2(i) |
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! pcfh sur l'ocean cf. Miller et al. (1992) |
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|
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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 == is_oce) pcfh(i) = cdran(i)*(1.0+zcr(i)**1.25) **(1./1.25) |
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ENDIF |
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END DO |
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|
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if (present(pref)) pref = pref_local |
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|
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END SUBROUTINE coefcdrag |
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|
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end module coefcdrag_m |
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