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! |
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! $Id $ |
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! |
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SUBROUTINE cltrac(dtime,coef,t,tr,flux,paprs,pplay,delp, & |
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d_tr,d_tr_dry,flux_tr_dry) !jyg |
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USE dimphy |
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IMPLICIT NONE |
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!====================================================================== |
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! Auteur(s): O. Boucher (LOA/LMD) date: 19961127 |
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! inspire de clvent |
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! Objet: diffusion verticale de traceurs avec flux fixe a la surface |
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! ou/et flux du type c-drag |
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! |
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! Arguments: |
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!----------- |
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! dtime.......input-R- intervalle du temps (en secondes) |
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! coef........input-R- le coefficient d'echange (m**2/s) l>1 |
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! t...........input-R- temperature (K) |
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! tr..........input-R- la q. de traceurs |
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! flux........input-R- le flux de traceurs a la surface |
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! paprs.......input-R- pression a inter-couche (Pa) |
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! pplay.......input-R- pression au milieu de couche (Pa) |
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! delp........input-R- epaisseur de couche (Pa) |
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! cdrag.......input-R- cdrag pour le flux de surface (non active) |
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! tr0.........input-R- traceurs a la surface ou dans l'ocean (non active) |
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! d_tr........output-R- le changement de tr |
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! d_tr_dry....output-R- le changement de tr du au depot sec (1st layer) |
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! flux_tr_dry.output-R- depot sec |
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!!! flux_tr..output-R- flux de tr |
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!====================================================================== |
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include "YOMCST.h" |
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! |
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! Entree |
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! |
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REAL,INTENT(IN) :: dtime |
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REAL,DIMENSION(klon,klev),INTENT(IN) :: coef |
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REAL,DIMENSION(klon,klev),INTENT(IN) :: t, tr |
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REAL,DIMENSION(klon),INTENT(IN) :: flux !(at/s/m2) |
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REAL,DIMENSION(klon,klev+1),INTENT(IN) :: paprs |
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REAL,DIMENSION(klon,klev),INTENT(IN) :: pplay, delp |
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! |
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! Sorties |
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! |
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REAL ,DIMENSION(klon,klev),INTENT(OUT) :: d_tr |
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REAL ,DIMENSION(klon),INTENT(OUT) :: d_tr_dry !jyg |
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REAL ,DIMENSION(klon),INTENT(OUT) :: flux_tr_dry !jyg |
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! REAL ,DIMENSION(klon,klev),INTENT(OUT) :: flux_tr |
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! |
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! Local |
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! |
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INTEGER :: i, k |
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REAL,DIMENSION(klon) :: cdrag, tr0 |
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REAL,DIMENSION(klon,klev) :: zx_ctr |
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REAL,DIMENSION(klon,klev) :: zx_dtr |
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REAL,DIMENSION(klon) :: zx_buf |
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REAL,DIMENSION(klon,klev) :: zx_coef |
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REAL,DIMENSION(klon,klev) :: local_tr |
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REAL,DIMENSION(klon) :: zx_alf1,zx_alf2,zx_flux |
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!====================================================================== |
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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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!====================================================================== |
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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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flux_tr_dry(i) = -flux(i)*dtime !jyg |
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zx_flux(i) = flux_tr_dry(i)*RG !jyg |
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!! zx_flux(i) = -flux(i)*dtime*RG !jyg |
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! Pour le moment le flux est prescrit 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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zx_ctr(i,1)=0. |
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zx_dtr(i,1)=0. |
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ENDDO |
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!====================================================================== |
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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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!====================================================================== |
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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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! |
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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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! |
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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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d_tr_dry(i) = -zx_flux(i)/zx_buf(i) !jyg |
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ENDDO |
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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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!====================================================================== |
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!== flux_tr est le flux de traceur (positif vers bas) |
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! DO i = 1, klon |
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! flux_tr(i,1) = zx_coef(i,1)/(RG*dtime) |
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! ENDDO |
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! DO k = 2, klev |
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! DO i = 1, klon |
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! flux_tr(i,k) = zx_coef(i,k)/(RG*dtime) |
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! . * (local_tr(i,k)-local_tr(i,k-1)) |
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! ENDDO |
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! ENDDO |
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!====================================================================== |
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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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END SUBROUTINE cltrac |
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