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module clvent_m |
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IMPLICIT none |
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contains |
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SUBROUTINE clvent(knon, dtime, u1lay, v1lay, coef, t, ven, paprs, pplay, & |
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delp, d_ven, flux_v) |
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! Author: Z. X. Li (LMD/CNRS) |
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! Date: 1993/08/18 |
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! Objet : diffusion verticale de la vitesse |
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USE dimphy, ONLY: klev, klon |
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USE suphec_m, ONLY: rd, rg |
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INTEGER knon |
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REAL, intent(in):: dtime ! intervalle de temps (en s) |
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REAL, intent(in):: u1lay(:), v1lay(:) ! (knon) |
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! vent de la premiere couche (m/s) |
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REAL, intent(in):: coef(:, :) ! (knon, klev) |
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! Coefficient d'echange (m**2/s) multiplié par le cisaillement du |
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! vent (dV/dz). La première valeur indique la valeur de Cdrag (sans |
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! unité). |
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REAL t(klon, klev), ven(klon, klev) |
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! t--------input-R- temperature (K) |
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! ven------input-R- vitesse horizontale (m/s) |
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REAL paprs(klon, klev+1), pplay(klon, klev), delp(klon, klev) |
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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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REAL d_ven(klon, klev) |
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! d_ven----output-R- le changement de "ven" |
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REAL, intent(out):: flux_v(:) ! (knon) |
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! (diagnostic) flux du vent à la surface, en (kg m/s)/(m**2 s) |
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! flux_v est le flux de moment angulaire (positif vers bas) |
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! Local: |
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INTEGER i, k |
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REAL zx_cv(klon, 2:klev) |
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REAL zx_dv(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_ven(klon, klev) |
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REAL zx_alf1(klon), zx_alf2(klon) |
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!------------------------------------------------------------------ |
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DO k = 1, klev |
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DO i = 1, knon |
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local_ven(i, k) = ven(i, k) |
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ENDDO |
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ENDDO |
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DO i = 1, knon |
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zx_alf1(i) = 1.0 |
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zx_alf2(i) = 1.0 - zx_alf1(i) |
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zx_coef(i, 1) = coef(i, 1) * (1. + SQRT(u1lay(i)**2 + v1lay(i)**2)) & |
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* pplay(i, 1) / (RD * t(i, 1)) |
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zx_coef(i, 1) = zx_coef(i, 1) * dtime * RG |
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ENDDO |
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DO k = 2, klev |
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DO i = 1, knon |
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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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DO i = 1, knon |
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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_cv(i, 2) = local_ven(i, 1)*delp(i, 1) / zx_buf(i) |
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zx_dv(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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DO k = 3, klev |
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DO i = 1, knon |
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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_dv(i, k-1)) |
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zx_cv(i, k) = (local_ven(i, k-1)*delp(i, k-1) & |
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+zx_coef(i, k-1)*zx_cv(i, k-1) )/zx_buf(i) |
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zx_dv(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, knon |
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local_ven(i, klev) = ( local_ven(i, klev)*delp(i, klev) & |
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+zx_coef(i, klev)*zx_cv(i, klev) ) & |
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/ ( delp(i, klev) + zx_coef(i, klev) & |
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-zx_coef(i, klev)*zx_dv(i, klev) ) |
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ENDDO |
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DO k = klev-1, 1, -1 |
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DO i = 1, knon |
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local_ven(i, k) = zx_cv(i, k+1) + zx_dv(i, k+1)*local_ven(i, k+1) |
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ENDDO |
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ENDDO |
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DO i = 1, knon |
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flux_v(i) = zx_coef(i, 1)/(RG*dtime) & |
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*(local_ven(i, 1)*zx_alf1(i) & |
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+local_ven(i, 2)*zx_alf2(i)) |
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ENDDO |
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DO k = 1, klev |
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DO i = 1, knon |
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d_ven(i, k) = local_ven(i, k) - ven(i, k) |
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ENDDO |
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ENDDO |
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END SUBROUTINE clvent |
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end module clvent_m |
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