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! $Header: /home/cvsroot/LMDZ4/libf/phylmd/plevel.F,v 1.1.1.1 2004/05/19 12:53:08 lmdzadmin Exp $ |
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c================================================================ |
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c================================================================ |
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SUBROUTINE plevel(ilon,ilev,lnew,pgcm,pres,Qgcm,Qpres) |
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c================================================================ |
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c================================================================ |
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use dimens_m |
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use dimphy |
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IMPLICIT none |
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c================================================================ |
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c |
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c Interpoler des champs 3-D u, v et g du modele a un niveau de |
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c pression donnee (pres) |
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c |
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c INPUT: ilon ----- nombre de points |
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c ilev ----- nombre de couches |
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c lnew ----- true si on doit reinitialiser les poids |
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c pgcm ----- pressions modeles |
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c pres ----- pression vers laquelle on interpolle |
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c Qgcm ----- champ GCM |
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c Qpres ---- champ interpolle au niveau pres |
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c |
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c================================================================ |
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c |
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c arguments : |
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c ----------- |
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INTEGER ilon, ilev |
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logical lnew |
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REAL, intent(in):: pgcm(ilon,ilev) |
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REAL Qgcm(ilon,ilev) |
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real pres |
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REAL Qpres(ilon) |
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c local : |
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c ------- |
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INTEGER lt(klon), lb(klon) |
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REAL ptop, pbot, aist(klon), aisb(klon) |
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save lt,lb,ptop,pbot,aist,aisb |
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INTEGER i, k |
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c |
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c===================================================================== |
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if (lnew) then |
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c on réinitialise les réindicages et les poids |
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c===================================================================== |
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c Chercher les 2 couches les plus proches du niveau a obtenir |
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c |
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c Eventuellement, faire l'extrapolation a partir des deux couches |
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c les plus basses ou les deux couches les plus hautes: |
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DO 130 i = 1, klon |
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IF ( ABS(pres-pgcm(i,ilev) ) .LT. |
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. ABS(pres-pgcm(i,1)) ) THEN |
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lt(i) = ilev ! 2 |
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lb(i) = ilev-1 ! 1 |
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ELSE |
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lt(i) = 2 |
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lb(i) = 1 |
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ENDIF |
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130 CONTINUE |
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DO 150 k = 1, ilev-1 |
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DO 140 i = 1, klon |
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pbot = pgcm(i,k) |
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ptop = pgcm(i,k+1) |
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IF (ptop.LE.pres .AND. pbot.GE.pres) THEN |
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lt(i) = k+1 |
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lb(i) = k |
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ENDIF |
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140 CONTINUE |
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150 CONTINUE |
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c |
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c Interpolation lineaire: |
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c |
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DO i = 1, klon |
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c interpolation en logarithme de pression: |
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c |
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c ... Modif . P. Le Van ( 20/01/98) .... |
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c Modif Frédéric Hourdin (3/01/02) |
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aist(i) = LOG( pgcm(i,lb(i))/ pres ) |
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. / LOG( pgcm(i,lb(i))/ pgcm(i,lt(i)) ) |
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aisb(i) = LOG( pres / pgcm(i,lt(i)) ) |
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. / LOG( pgcm(i,lb(i))/ pgcm(i,lt(i))) |
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enddo |
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endif ! lnew |
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c====================================================================== |
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c inteprollation |
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c====================================================================== |
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do i=1,klon |
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Qpres(i)= Qgcm(i,lb(i))*aisb(i)+Qgcm(i,lt(i))*aist(i) |
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enddo |
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c |
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c Je mets les vents a zero quand je rencontre une montagne |
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do i = 1, klon |
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if (pgcm(i,1).LT.pres) THEN |
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c Qpres(i)=1e33 |
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Qpres(i)=1e+20 |
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endif |
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enddo |
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c |
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RETURN |
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END |
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