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! $Header: /home/cvsroot/LMDZ4/libf/phylmd/screenp.F90,v 1.1.1.1 2004/05/19 12:53:09 lmdzadmin Exp $ |
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SUBROUTINE screenp(klon, knon, nsrf, & |
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& speed, tair, qair, & |
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& ts, qsurf, rugos, lmon, & |
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& ustar, testar, qstar, zref, & |
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& delu, delte, delq) |
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IMPLICIT none |
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!------------------------------------------------------------------------- |
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! |
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! Objet : calcul "predicteur" des anomalies du vent, de la temperature |
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! potentielle et de l'humidite relative au niveau de reference zref et |
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! par rapport au 1er niveau (pour u) ou a la surface (pour theta et q) |
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! a partir des relations de Dyer-Businger. |
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! |
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! Reference : Hess, Colman et McAvaney (1995) |
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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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! speed---input-R- module du vent au 1er niveau du modele |
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! tair----input-R- temperature de l'air au 1er niveau du modele |
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! qair----input-R- humidite relative au 1er niveau du modele |
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! ts------input-R- temperature de l'air a la surface |
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! qsurf---input-R- humidite relative a la surface |
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! rugos---input-R- rugosite |
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! lmon----input-R- longueur de Monin-Obukov |
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! ustar---input-R- facteur d'echelle pour le vent |
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! testar--input-R- facteur d'echelle pour la temperature potentielle |
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! qstar---input-R- facteur d'echelle pour l'humidite relative |
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! zref----input-R- altitude de reference |
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! |
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! delu----input-R- anomalie du vent par rapport au 1er niveau |
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! delte---input-R- anomalie de la temperature potentielle par rapport a la surface |
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! delq----input-R- anomalie de l'humidite relative par rapport a la surface |
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! |
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INTEGER, intent(in) :: klon, knon, nsrf |
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REAL, dimension(klon), intent(in) :: speed, tair, qair |
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REAL, dimension(klon), intent(in) :: ts, qsurf, rugos |
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DOUBLE PRECISION, dimension(klon), intent(in) :: lmon |
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REAL, dimension(klon), intent(in) :: ustar, testar, qstar |
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REAL, intent(in) :: zref |
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! |
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REAL, dimension(klon), intent(out) :: delu, delte, delq |
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! |
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!------------------------------------------------------------------------- |
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! Variables locales et constantes : |
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REAL, PARAMETER :: RKAR=0.40 |
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INTEGER :: i |
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REAL :: xtmp, xtmp0 |
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!------------------------------------------------------------------------- |
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DO i = 1, knon |
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! |
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IF (lmon(i).GE.0.) THEN |
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! |
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! STABLE CASE |
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! |
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IF (speed(i).GT.1.5.AND.lmon(i).LE.1.0) THEN |
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delu(i) = (ustar(i)/RKAR)* & |
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(log(zref/(rugos(i))+1.) + & |
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min(5d0, 5d0 *(zref - rugos(i))/lmon(i))) |
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delte(i) = (testar(i)/RKAR)* & |
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(log(zref/(rugos(i))+1.) + & |
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min(5d0, 5d0 * (zref - rugos(i))/lmon(i))) |
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delq(i) = (qstar(i)/RKAR)* & |
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(log(zref/(rugos(i))+1.) + & |
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min(5d0, 5d0 * (zref - rugos(i))/lmon(i))) |
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ELSE |
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delu(i) = 0.1 * speed(i) |
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delte(i) = 0.1 * (tair(i) - ts(i) ) |
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delq(i) = 0.1 * (max(qair(i),0.0) - max(qsurf(i),0.0)) |
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ENDIF |
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ELSE |
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! |
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! UNSTABLE CASE |
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! |
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IF (speed(i).GT.5.0.AND.abs(lmon(i)).LE.50.0) THEN |
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xtmp = (1. - 16. * (zref/lmon(i)))**(1./4.) |
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xtmp0 = (1. - 16. * (rugos(i)/lmon(i)))**(1./4.) |
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delu(i) = (ustar(i)/RKAR)* & |
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(log(zref/(rugos(i))+1.) & |
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- 2.*log(0.5*(1. + xtmp)) & |
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+ 2.*log(0.5*(1. + xtmp0)) & |
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- log(0.5*(1. + xtmp*xtmp)) & |
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+ log(0.5*(1. + xtmp0*xtmp0)) & |
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+ 2.*atan(xtmp) - 2.*atan(xtmp0)) |
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delte(i) = (testar(i)/RKAR)* & |
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(log(zref/(rugos(i))+1.) & |
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- 2.0 * log(0.5*(1. + xtmp*xtmp)) & |
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+ 2.0 * log(0.5*(1. + xtmp0*xtmp0))) |
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delq(i) = (qstar(i)/RKAR)* & |
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(log(zref/(rugos(i))+1.) & |
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- 2.0 * log(0.5*(1. + xtmp*xtmp)) & |
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+ 2.0 * log(0.5*(1. + xtmp0*xtmp0))) |
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ELSE |
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delu(i) = 0.5 * speed(i) |
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delte(i) = 0.5 * (tair(i) - ts(i) ) |
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delq(i) = 0.5 * (max(qair(i),0.0) - max(qsurf(i),0.0)) |
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ENDIF |
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ENDIF |
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! |
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ENDDO |
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RETURN |
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END SUBROUTINE screenp |
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