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module stdlevvar_m |
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IMPLICIT NONE |
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contains |
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SUBROUTINE stdlevvar(klon, knon, nsrf, zxli, u1, v1, t1, q1, z1, ts1, & |
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qsurf, rugos, psol, pat1, t_2m, q_2m, t_10m, q_10m, u_10m, ustar) |
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! From LMDZ4/libf/phylmd/stdlevvar.F90, version 1.3 2005/05/25 13:10:09 |
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use coefcdrag_m, only: coefcdrag |
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USE suphec_m, ONLY: rg, rkappa |
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use screenp_m, only: screenp |
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! Objet : calcul de la température et de l'humidité relative à 2 m |
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! et du module du vent à 10 m à partir des relations de |
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! Dyer-Businger et des équations de Louis. |
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! Reference: Hess, Colman and McAvaney (1995) |
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! Author: I. Musat, July 1st, 2002 |
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INTEGER, intent(in):: klon |
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! dimension de la grille physique (= nb_pts_latitude X nb_pts_longitude) |
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INTEGER, intent(in):: knon ! nombre de points pour un type de surface |
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INTEGER, intent(in):: nsrf |
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! indice pour le type de surface; voir indicesol.inc |
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LOGICAL, intent(in):: zxli ! calcul des cdrags selon Laurent Li |
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REAL, dimension(klon), intent(in):: u1 ! vent zonal au 1er niveau du modele |
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REAL, dimension(klon), intent(in):: v1 |
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! vent meridien au 1er niveau du modele |
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REAL, dimension(klon), intent(in):: t1 |
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! temperature de l'air au 1er niveau du modele |
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REAL, dimension(klon), intent(in):: q1 |
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! humidite relative au 1er niveau du modele |
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REAL, dimension(klon), intent(in):: z1 |
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! geopotentiel au 1er niveau du modele |
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REAL, dimension(klon), intent(in):: ts1 ! temperature de l'air a la surface |
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REAL, dimension(klon), intent(in):: qsurf ! humidite relative a la surface |
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REAL, dimension(klon), intent(in):: rugos ! rugosite |
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REAL, dimension(klon), intent(in):: psol ! pression au sol |
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REAL, dimension(klon), intent(in):: pat1 ! pression au 1er niveau du modele |
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REAL, dimension(klon), intent(out):: t_2m ! temperature de l'air a 2m |
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REAL, dimension(klon), intent(out):: q_2m ! humidite relative a 2m |
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REAL, dimension(klon), intent(out):: t_10m ! temperature de l'air a 10m |
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REAL, dimension(klon), intent(out):: q_10m ! humidite specifique a 10m |
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REAL, dimension(klon), intent(out):: u_10m ! vitesse du vent a 10m |
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REAL, intent(out):: ustar(klon) ! u* |
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! Local: |
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! RKAR : constante de von Karman |
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REAL, PARAMETER:: RKAR=0.40 |
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! niter : nombre iterations calcul "corrector" |
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INTEGER, parameter:: niter=2 |
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! Variables locales |
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INTEGER i, n |
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REAL zref |
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REAL, dimension(klon):: speed |
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! tpot : temperature potentielle |
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REAL, dimension(klon):: tpot |
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REAL, dimension(klon):: zri1, cdran |
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REAL cdram(klon), cdrah(klon) |
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! ri1 : nb. de Richardson entre la surface --> la 1ere couche |
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REAL, dimension(klon):: ri1 |
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REAL, dimension(klon):: testar, qstar |
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REAL, dimension(klon):: zdte, zdq |
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! lmon : longueur de Monin-Obukhov selon Hess, Colman and McAvaney |
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DOUBLE PRECISION, dimension(klon):: lmon |
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REAL, dimension(klon):: delu, delte, delq |
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REAL, dimension(klon):: u_zref, te_zref, q_zref |
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REAL, dimension(klon):: temp, pref |
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LOGICAL okri |
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REAL, dimension(klon):: u_zref_p, temp_p, q_zref_p |
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!convertgence |
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REAL, dimension(klon):: u_zref_c, temp_c, q_zref_c |
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REAL, dimension(klon):: ok_pred, ok_corr |
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!------------------------------------------------------------------------- |
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DO i=1, knon |
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speed(i)=SQRT(u1(i)**2+v1(i)**2) |
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ri1(i) = 0.0 |
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ENDDO |
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okri=.FALSE. |
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CALL coefcdrag(klon, knon, nsrf, zxli, speed, t1, q1, z1, psol, ts1, & |
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qsurf, rugos, okri, ri1, cdram, cdrah, cdran, zri1, pref) |
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! Star variables |
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DO i = 1, knon |
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ri1(i) = zri1(i) |
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tpot(i) = t1(i)* (psol(i)/pat1(i))**RKAPPA |
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ustar(i) = sqrt(cdram(i) * speed(i) * speed(i)) |
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zdte(i) = tpot(i) - ts1(i) |
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zdq(i) = max(q1(i), 0.0) - max(qsurf(i), 0.0) |
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zdte(i) = sign(max(abs(zdte(i)), 1.e-10), zdte(i)) |
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testar(i) = (cdrah(i) * zdte(i) * speed(i))/ustar(i) |
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qstar(i) = (cdrah(i) * zdq(i) * speed(i))/ustar(i) |
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lmon(i) = (ustar(i) * ustar(i) * tpot(i))/ & |
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(RKAR * RG * testar(i)) |
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ENDDO |
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! First aproximation of variables at zref |
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zref = 2.0 |
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CALL screenp(klon, knon, speed, tpot, q1, & |
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ts1, qsurf, rugos, lmon, & |
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ustar, testar, qstar, zref, & |
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delu, delte, delq) |
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DO i = 1, knon |
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u_zref(i) = delu(i) |
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q_zref(i) = max(qsurf(i), 0.0) + delq(i) |
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te_zref(i) = ts1(i) + delte(i) |
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temp(i) = te_zref(i) * (psol(i)/pat1(i))**(-RKAPPA) |
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q_zref_p(i) = q_zref(i) |
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temp_p(i) = temp(i) |
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ENDDO |
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! Iteration of the variables at the reference level zref : |
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! corrector calculation ; see Hess & McAvaney, 1995 |
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DO n = 1, niter |
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okri=.TRUE. |
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CALL screenc(klon, knon, nsrf, zxli, & |
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u_zref, temp, q_zref, zref, & |
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ts1, qsurf, rugos, psol, & |
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ustar, testar, qstar, okri, ri1, & |
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pref, delu, delte, delq) |
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DO i = 1, knon |
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u_zref(i) = delu(i) |
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q_zref(i) = delq(i) + max(qsurf(i), 0.0) |
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te_zref(i) = delte(i) + ts1(i) |
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! return to normal temperature |
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temp(i) = te_zref(i) * (psol(i)/pref(i))**(-RKAPPA) |
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ENDDO |
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ENDDO |
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! verifier le critere de convergence : 0.25% pour te_zref et 5% pour qe_zref |
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DO i = 1, knon |
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q_zref_c(i) = q_zref(i) |
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temp_c(i) = temp(i) |
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ok_pred(i)=0. |
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ok_corr(i)=1. |
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t_2m(i) = temp_p(i) * ok_pred(i) + temp_c(i) * ok_corr(i) |
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q_2m(i) = q_zref_p(i) * ok_pred(i) + q_zref_c(i) * ok_corr(i) |
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ENDDO |
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! First aproximation of variables at zref |
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zref = 10.0 |
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CALL screenp(klon, knon, speed, tpot, q1, & |
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ts1, qsurf, rugos, lmon, & |
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ustar, testar, qstar, zref, & |
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delu, delte, delq) |
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DO i = 1, knon |
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u_zref(i) = delu(i) |
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q_zref(i) = max(qsurf(i), 0.0) + delq(i) |
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te_zref(i) = ts1(i) + delte(i) |
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temp(i) = te_zref(i) * (psol(i)/pat1(i))**(-RKAPPA) |
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u_zref_p(i) = u_zref(i) |
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ENDDO |
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! Iteration of the variables at the reference level zref: |
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! corrector ; see Hess & McAvaney, 1995 |
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DO n = 1, niter |
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okri=.TRUE. |
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CALL screenc(klon, knon, nsrf, zxli, & |
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u_zref, temp, q_zref, zref, & |
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ts1, qsurf, rugos, psol, & |
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ustar, testar, qstar, okri, ri1, & |
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pref, delu, delte, delq) |
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DO i = 1, knon |
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u_zref(i) = delu(i) |
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q_zref(i) = delq(i) + max(qsurf(i), 0.0) |
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te_zref(i) = delte(i) + ts1(i) |
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temp(i) = te_zref(i) * (psol(i)/pref(i))**(-RKAPPA) |
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ENDDO |
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ENDDO |
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DO i = 1, knon |
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u_zref_c(i) = u_zref(i) |
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u_10m(i) = u_zref_p(i) * ok_pred(i) + u_zref_c(i) * ok_corr(i) |
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q_zref_c(i) = q_zref(i) |
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temp_c(i) = temp(i) |
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t_10m(i) = temp_p(i) * ok_pred(i) + temp_c(i) * ok_corr(i) |
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q_10m(i) = q_zref_p(i) * ok_pred(i) + q_zref_c(i) * ok_corr(i) |
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ENDDO |
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END subroutine stdlevvar |
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end module stdlevvar_m |
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