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! $Header: /home/cvsroot/LMDZ4/libf/phylmd/cltrac.F,v 1.1.1.1 2004/05/19 12:53:07 lmdzadmin Exp $ |
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! |
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SUBROUTINE cltrac(dtime,coef,t,tr,flux,paprs,pplay,delp, |
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s d_tr) |
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use dimens_m |
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use dimphy |
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use YOMCST |
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IMPLICIT none |
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c====================================================================== |
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c Auteur(s): O. Boucher (LOA/LMD) date: 19961127 |
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c inspire de clvent |
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c Objet: diffusion verticale de traceurs avec flux fixe a la surface |
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c ou/et flux du type c-drag |
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c====================================================================== |
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c Arguments: |
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c dtime----input-R- intervalle du temps (en second) |
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c coef-----input-R- le coefficient d'echange (m**2/s) l>1 |
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c tr-------input-R- la q. de traceurs |
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c flux-----input-R- le flux de traceurs a la surface |
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c paprs----input-R- pression a inter-couche (Pa) |
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c pplay----input-R- pression au milieu de couche (Pa) |
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c delp-----input-R- epaisseur de couche (Pa) |
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c cdrag----input-R- cdrag pour le flux de surface (non active) |
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c tr0------input-R- traceurs a la surface ou dans l'ocean (non active) |
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c d_tr-----output-R- le changement de tr |
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c flux_tr--output-R- flux de tr |
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c====================================================================== |
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REAL dtime |
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REAL coef(klon,klev) |
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REAL, intent(in):: t(klon,klev) ! temperature (K) |
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real tr(klon,klev) |
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REAL, intent(in):: paprs(klon,klev+1) |
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real pplay(klon,klev), delp(klon,klev) |
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REAL d_tr(klon,klev) |
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REAL flux(klon), cdrag(klon), tr0(klon) |
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c REAL flux_tr(klon,klev) |
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c====================================================================== |
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c====================================================================== |
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INTEGER i, k |
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REAL zx_ctr(klon,2:klev) |
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REAL zx_dtr(klon,2:klev) |
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REAL zx_buf(klon) |
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REAL zx_coef(klon,klev) |
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REAL local_tr(klon,klev) |
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REAL zx_alf1(klon), zx_alf2(klon), zx_flux(klon) |
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c====================================================================== |
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DO k = 1, klev |
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DO i = 1, klon |
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local_tr(i,k) = tr(i,k) |
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ENDDO |
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ENDDO |
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c |
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|
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c====================================================================== |
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DO i = 1, klon |
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zx_alf1(i) = (paprs(i,1)-pplay(i,2))/(pplay(i,1)-pplay(i,2)) |
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zx_alf2(i) = 1.0 - zx_alf1(i) |
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zx_flux(i) = -flux(i)*dtime*RG |
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c--pour le moment le flux est prescrit |
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c--cdrag et zx_coef(1) vaut 0 |
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cdrag(i) = 0.0 |
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tr0(i) = 0.0 |
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zx_coef(i,1) = cdrag(i)*dtime*RG |
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ENDDO |
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c====================================================================== |
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DO k = 2, klev |
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DO i = 1, klon |
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zx_coef(i,k) = coef(i,k)*RG/(pplay(i,k-1)-pplay(i,k)) |
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. *(paprs(i,k)*2/(t(i,k)+t(i,k-1))/RD)**2 |
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zx_coef(i,k) = zx_coef(i,k)*dtime*RG |
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ENDDO |
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ENDDO |
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c====================================================================== |
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DO i = 1, klon |
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zx_buf(i) = delp(i,1) + zx_coef(i,1)*zx_alf1(i) + zx_coef(i,2) |
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zx_ctr(i,2) = (local_tr(i,1)*delp(i,1)+ |
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. zx_coef(i,1)*tr0(i)-zx_flux(i))/zx_buf(i) |
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zx_dtr(i,2) = (zx_coef(i,2)-zx_alf2(i)*zx_coef(i,1)) / |
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. zx_buf(i) |
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ENDDO |
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c |
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DO k = 3, klev |
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DO i = 1, klon |
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zx_buf(i) = delp(i,k-1) + zx_coef(i,k) |
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. + zx_coef(i,k-1)*(1.-zx_dtr(i,k-1)) |
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zx_ctr(i,k) = (local_tr(i,k-1)*delp(i,k-1) |
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. +zx_coef(i,k-1)*zx_ctr(i,k-1) )/zx_buf(i) |
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zx_dtr(i,k) = zx_coef(i,k)/zx_buf(i) |
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ENDDO |
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ENDDO |
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DO i = 1, klon |
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local_tr(i,klev) = ( local_tr(i,klev)*delp(i,klev) |
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. +zx_coef(i,klev)*zx_ctr(i,klev) ) |
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. / ( delp(i,klev) + zx_coef(i,klev) |
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. -zx_coef(i,klev)*zx_dtr(i,klev) ) |
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ENDDO |
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DO k = klev-1, 1, -1 |
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DO i = 1, klon |
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local_tr(i,k) = zx_ctr(i,k+1) + zx_dtr(i,k+1)*local_tr(i,k+1) |
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ENDDO |
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ENDDO |
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c====================================================================== |
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c== flux_tr est le flux de traceur (positif vers bas) |
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c DO i = 1, klon |
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c flux_tr(i,1) = zx_coef(i,1)/(RG*dtime) |
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c ENDDO |
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c DO k = 2, klev |
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c DO i = 1, klon |
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c flux_tr(i,k) = zx_coef(i,k)/(RG*dtime) |
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c . * (local_tr(i,k)-local_tr(i,k-1)) |
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c ENDDO |
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c ENDDO |
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c====================================================================== |
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DO k = 1, klev |
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DO i = 1, klon |
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d_tr(i,k) = local_tr(i,k) - tr(i,k) |
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ENDDO |
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ENDDO |
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c |
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RETURN |
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END |
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