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module cltrac_m |
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IMPLICIT NONE |
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contains |
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SUBROUTINE cltrac(dtime, coef, t, tr, flux, paprs, pplay, delp, d_tr) |
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! From LMDZ4/libf/phylmd/cltrac.F,v 1.1.1.1 2004/05/19 12:53:07 |
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USE dimens_m |
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USE dimphy |
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USE suphec_m |
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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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! dtime----input-R- intervalle du temps (en second) |
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! coef-----input-R- le coefficient d'echange (m**2/s) l>1 |
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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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! flux_tr--output-R- flux de tr |
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! ====================================================================== |
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REAL, INTENT (IN) :: 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, INTENT (IN) :: pplay(klon, klev) |
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REAL 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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! REAL flux_tr(klon,klev) |
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! ====================================================================== |
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! ====================================================================== |
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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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! ====================================================================== |
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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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END DO |
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END DO |
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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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zx_flux(i) = -flux(i)*dtime*rg |
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! --pour le moment le flux est prescrit |
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! --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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END DO |
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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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END DO |
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END DO |
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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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zx_ctr(i, 2) = (local_tr(i,1)*delp(i,1)+zx_coef(i,1)*tr0(i)-zx_flux(i))/ & |
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zx_buf(i) |
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zx_dtr(i, 2) = (zx_coef(i,2)-zx_alf2(i)*zx_coef(i,1))/zx_buf(i) |
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END DO |
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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) + zx_coef(i, k-1)*(1.-zx_dtr(i & |
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,k-1)) |
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zx_ctr(i, k) = (local_tr(i,k-1)*delp(i,k-1)+zx_coef(i,k-1)*zx_ctr(i,k-1 & |
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))/zx_buf(i) |
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zx_dtr(i, k) = zx_coef(i, k)/zx_buf(i) |
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END DO |
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END DO |
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DO i = 1, klon |
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local_tr(i, klev) = (local_tr(i,klev)*delp(i,klev)+zx_coef(i,klev)*zx_ctr & |
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(i,klev))/(delp(i,klev)+zx_coef(i,klev)-zx_coef(i,klev)*zx_dtr(i,klev)) |
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END DO |
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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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END DO |
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END DO |
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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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END DO |
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END DO |
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RETURN |
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END SUBROUTINE cltrac |
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end module cltrac_m |
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