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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, version 1.1.1.1 2004/05/19 12:53:07 |
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USE dimphy, only: klon, klev |
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USE suphec_m, only: rd, rg |
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! Auteur : O. Boucher (LOA/LMD), date: 1996/11/27 |
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! inspir\'e de clvent |
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! Objet: diffusion verticale de traceurs avec flux fix\'e \`a la |
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! surface ou flux du type c-drag |
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REAL, INTENT(IN):: dtime ! intervalle du temps (en second) |
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REAL, INTENT(IN):: coef(:, 2:) ! (klon, 2:klev) |
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! coefficient d'echange (m**2/s) l>1 |
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REAL, INTENT(IN):: t(klon, klev) ! temperature (K) |
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REAL, INTENT(IN):: tr(klon, klev) ! la q. de traceurs |
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REAL, INTENT(IN):: flux(klon) ! le flux de traceurs a la surface |
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REAL, INTENT(IN):: paprs(klon, klev+1) ! pression a inter-couche (Pa) |
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REAL, INTENT(IN):: pplay(klon, klev) ! pression au milieu de couche (Pa) |
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REAL, INTENT(IN):: delp(klon, klev) ! epaisseur de couche (Pa) |
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REAL, INTENT(out):: d_tr(klon, klev) ! le changement de tr |
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! Local: |
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|
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real tr0(klon) |
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! tr0 traceurs a la surface ou dans l'ocean (non active) |
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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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!----------------------------------------------------------------------- |
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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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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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! zx_coef(1) vaut 0 |
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tr0(i) = 0.0 |
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zx_coef(i, 1) = 0. |
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END DO |
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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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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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|
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end module cltrac_m |
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