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C $Header: /u/gcmpack/MITgcm/pkg/diagnostics/prestopres.F,v 1.3 2005/10/25 16:27:30 molod Exp $ |
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C $Name: $ |
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#include "DIAG_OPTIONS.h" |
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subroutine prestopres (qprs,qinp,pkz,pksrf,ptop,p,im,jm,lm,myThid) |
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C*********************************************************************** |
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C |
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C PURPOSE |
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C To interpolate an arbitrary quantity to Specified Pressure Levels |
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C |
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C INPUT |
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C QINP .. QINP (im,jm,lm) Arbitrary Input Quantity |
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C PKZ ... PKZ (im,jm,lm) Pressure to the Kappa at Input Levels |
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C PKSRF . PKSRF(im,jm) Surface Pressure to the Kappa |
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C PTOP .. Pressure at Input-Level-Edge (1) (top of model) |
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C P ..... Output Pressure Level (mb) |
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C IM .... Longitude Dimension of Input |
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C JM .... Latitude Dimension of Input |
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C LM .... Vertical Dimension of Input |
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C |
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C OUTPUT |
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C QPRS .. QPRS (im,jm) Arbitrary Quantity at Pressure p |
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C |
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C NOTE |
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C Quantity is interpolated Linear in P**Kappa. |
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C Between PTOP**Kappa and PKZ(1), quantity is extrapolated. |
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C Between PKSRF**Kappa and PKZ(LM), quantity is extrapolated. |
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C Undefined Input quantities are not used. |
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C Finally: This routine assumes that pressure levels are counted |
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C top down -- ie, level 1 is the top, level lm is the bottom |
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C |
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C*********************************************************************** |
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C |
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implicit none |
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integer i,l,im,jm,lm,myThid |
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|
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_RL qprs(im,jm) |
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_RL qinp(im,jm,lm) |
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_RL pkz(im,jm,lm) |
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_RL pksrf(im,jm) |
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|
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_RL ptop,p,undef,kappa,getcon |
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_RL pk,pkmin,pkmax,pktop,temp |
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|
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undef = getcon('UNDEF') |
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kappa = getcon('KAPPA') |
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|
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pk = p**kappa |
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if(ptop.ne.0.) then |
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pktop = ptop**kappa |
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else |
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pktop = 0. |
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endif |
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|
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c Initialize to UNDEFINED |
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c ----------------------- |
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do i=1,im*jm |
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qprs(i,1) = undef |
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enddo |
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|
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c Interpolate to Pressure Between Input Levels |
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c -------------------------------------------- |
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do L=1,lm-1 |
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pkmin = pkz(1,1,L) |
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pkmax = pkz(1,1,L+1) |
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|
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do i=2,im*jm |
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if( pkz(i,1,L) .lt.pkmin ) pkmin = pkz(i,1,L) |
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if( pkz(i,1,L+1).gt.pkmax ) pkmax = pkz(i,1,L+1) |
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enddo |
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|
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if( pk.le.pkmax .and. pk.ge.pkmin ) then |
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do i=1,im*jm |
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if( pk.le.pkz(i,1,L+1) .and. pk.ge.pkz(i,1,L) ) then |
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temp = ( pkz(i,1,L)-pk ) / ( pkz(i,1,L)-pkz(i,1,L+1) ) |
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|
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if( qinp(i,1,L) .ne.undef .and. |
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. qinp(i,1,L+1).ne.undef ) then |
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qprs(i,1) = qinp(i,1,L+1)*temp + qinp(i,1,L)*(1.-temp) |
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else if( qinp(i,1,L+1).ne.undef .and. temp.ge.0.5 ) then |
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qprs(i,1) = qinp(i,1,L+1) |
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else if( qinp(i,1,L) .ne.undef .and. temp.le.0.5 ) then |
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qprs(i,1) = qinp(i,1,L) |
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endif |
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|
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endif |
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enddo |
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endif |
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|
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enddo |
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|
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do i=1,im*jm |
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c Extrapolate to Pressure between Ptop and First Input Level |
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c ---------------------------------------------------------- |
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if( pk.le.pkz(i,1,1) .and. pk.ge.pktop ) then |
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temp = ( pkz(i,1,1)-pk ) / ( pkz(i,1,1)-pkz(i,1,2) ) |
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|
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if( qinp(i,1,1).ne.undef .and. |
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. qinp(i,1,2).ne.undef ) then |
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qprs(i,1) = qinp(i,1,2)*temp + qinp(i,1,1)*(1.-temp) |
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else if( qinp(i,1,1).ne.undef ) then |
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qprs(i,1) = qinp(i,1,1) |
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endif |
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|
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endif |
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|
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c Extrapolate to Pressure between Psurf and Lowest Input Level |
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c ------------------------------------------------------------ |
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if( pk.le.pksrf(i,1) .and. pk.ge.pkz(i,1,lm ) ) then |
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temp = ( pkz(i,1,lm)-pk ) / ( pkz(i,1,lm)-pkz(i,1,lm-1) ) |
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|
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if( qinp(i,1,lm) .ne.undef .and. |
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. qinp(i,1,lm-1).ne.undef ) then |
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qprs(i,1) = qinp(i,1,lm-1)*temp + qinp(i,1,lm)*(1.-temp) |
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else if( qinp(i,1,lm) .ne.undef ) then |
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qprs(i,1) = qinp(i,1,lm) |
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endif |
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|
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endif |
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enddo |
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|
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return |
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end |
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