| 1 |
jmc |
1.9 |
C $Header: /u/gcmpack/MITgcm/pkg/fizhi/fizhi_fillnegs.F,v 1.8 2004/08/05 17:06:40 molod Exp $ |
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molod |
1.4 |
C $Name: $ |
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jmc |
1.9 |
|
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molod |
1.4 |
#include "FIZHI_OPTIONS.h" |
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molod |
1.8 |
SUBROUTINE QCHECK ( idim1,idim2,jdim1,jdim2,ldim,Nsx,Nsy,im1,im2, |
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. jm1,jm2,bi,bj,dp,qz) |
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molod |
1.1 |
C*********************************************************************** |
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jmc |
1.9 |
C Purpose |
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C Check Specific Humidity Field for Negative values |
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molod |
1.1 |
C |
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C Argument Description |
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molod |
1.6 |
C IDIM1 .... Start Zonal Dimension |
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C IDIM2 .... End Zonal Dimension |
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C JDIM1 .... Start Meridional Dimension |
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C JDIM2 .... End Meridional Dimension |
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C IM1 ...... Start Zonal Span |
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C IM2 ...... End Zonal Span |
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C JM1 ...... Start Meridional Span |
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C JM2 ...... End Meridional Span |
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molod |
1.7 |
C LDIM ..... Vertical Dimension |
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molod |
1.6 |
C DP ....... Delta Pressure |
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C QZ ........Specific Humidity (g/g) |
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molod |
1.1 |
C*********************************************************************** |
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implicit none |
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molod |
1.6 |
integer idim1,idim2,jdim1,jdim2,Ldim,im1,im2,jm1,jm2 |
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molod |
1.8 |
integer Nsx,Nsy,bi,bj |
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_RL qz(idim1:idim2,jdim1:jdim2,ldim,Nsx,Nsy) |
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_RL dp(idim1:idim2,jdim1:jdim2,ldim,Nsx,Nsy) |
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molod |
1.1 |
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integer i,j,L,LM1 |
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molod |
1.8 |
_RL ddsig |
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molod |
1.1 |
|
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c Fill Negative Specific Humidities |
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c --------------------------------- |
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molod |
1.6 |
DO L=2,Ldim |
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jmc |
1.9 |
LM1 = L-1 |
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molod |
1.6 |
do j=jm1,jm2 |
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do i=im1,im2 |
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jmc |
1.9 |
ddsig = dp(i,j,LM1,bi,bj)/dp(i,j,L,bi,bj) |
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if( qz(i,j,LM1,bi,bj).lt.0.0 _d 0) then |
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molod |
1.8 |
qz(i,j,L,bi,bj ) = qz(i,j,L,bi,bj) + qz(i,j,LM1,bi,bj)*ddsig |
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qz(i,j,LM1,bi,bj) = 0.0 _d 0 |
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molod |
1.5 |
endif |
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enddo |
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enddo |
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enddo |
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molod |
1.1 |
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molod |
1.6 |
do j=jm1,jm2 |
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do i=im1,im2 |
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molod |
1.8 |
if(qz(i,j,Ldim,bi,bj).lt.0.0 _d 0)qz(i,j,Ldim,bi,bj) = 0.0 _d 0 |
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molod |
1.5 |
enddo |
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enddo |
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molod |
1.1 |
|
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jmc |
1.9 |
return |
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end |
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molod |
1.1 |
|
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molod |
1.2 |
subroutine tracer_fill ( pq,im,jm,lm,dlam,dphi,dp) |
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molod |
1.1 |
C*********************************************************************** |
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jmc |
1.9 |
C PURPOSE |
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molod |
1.1 |
C Fill negative tracer values using local borrowing |
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jmc |
1.9 |
C |
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C INPUT |
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molod |
1.1 |
C pq ..... Mass-weighted (PI) Tracer |
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C im ..... Zonal Dimension |
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C jm ..... Meridional Dimension |
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C lm ..... Vertical Dimension |
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C dlam ... Zonal Grid Increment |
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C dphi ... Meridional Grid Increment |
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molod |
1.2 |
C dp ..... Vertical Grid Increment |
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jmc |
1.9 |
C |
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molod |
1.1 |
C Note: |
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jmc |
1.9 |
C If no immediate surrounding value is large enough to fill negative |
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molod |
1.2 |
C value, |
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jmc |
1.9 |
C the sum of immediate surrounding positive values is tried. |
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molod |
1.1 |
C If sum is not large enough, tracer is simply set to zero. |
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jmc |
1.9 |
C |
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molod |
1.1 |
C*********************************************************************** |
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implicit none |
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c Input Variables |
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c --------------- |
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integer im,jm,lm |
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molod |
1.4 |
_RL pq(im,jm,lm),dlam(im),dphi(jm),dp(im,jm,lm) |
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molod |
1.1 |
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c Local Variables |
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c --------------- |
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integer i,j,l,im1,ip1,imax,m |
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molod |
1.4 |
_RL lam(im), phi(jm) |
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_RL array(6) |
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_RL pi,a,getcon,undef |
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_RL qmax,qval,sum,fact |
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_RL dxu(im,jm) |
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_RL dxv(im,jm) |
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_RL dxp(im,jm) |
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_RL dyv(im,jm) |
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_RL dyp(im,jm) |
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molod |
1.1 |
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molod |
1.4 |
_RL d2p(im,jm) |
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molod |
1.1 |
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C ********************************************************* |
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C **** Initialization **** |
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C ********************************************************* |
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pi = 4.0*atan(1.0) |
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a = getcon('EARTH RADIUS') |
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c Compute Longitudes |
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c ------------------ |
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lam(1) = -pi |
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do i=2,im |
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lam(i) = lam(i-1) + dlam(i-1) |
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enddo |
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c Compute Latitudes |
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c ----------------- |
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phi(1) = -pi/2. |
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do j=2,jm-1 |
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phi(j) = phi(j-1) + dphi(j-1) |
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enddo |
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phi(jm) = pi/2. |
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c Compute DXU and DYV |
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c ------------------- |
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do j=2,jm-1 |
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do i=1,im |
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dxu(i,j) = a*cos(phi(j))*dlam(i) |
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enddo |
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enddo |
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do j=2,jm-2 |
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do i=1,im |
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dyv(i,j) = a*dphi(j) |
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enddo |
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enddo |
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do i=1,im |
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dyv(i,1) = a*(dphi(1) +0.5*dphi(2) ) |
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dyv(i,jm-1) = a*(dphi(jm-1)+0.5*dphi(jm-2)) |
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enddo |
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c Compute DXP and DXV |
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c ------------------- |
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do j=2,jm-1 |
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im1 = im |
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do i=1,im |
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dxp(i,j) = ( dxu(i,j)+dxu(im1,j) )*0.5 |
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im1 = i |
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enddo |
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enddo |
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do j=2,jm-2 |
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do i=1,im |
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dxv(i,j) = ( dxp(i,j)+dxp(i,j+1) )*0.5 |
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enddo |
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enddo |
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| 159 |
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c Compute DYP |
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c ----------- |
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do j=3,jm-2 |
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do i=1,im |
| 163 |
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dyp(i,j) = ( dyv(i,j)+dyv(i,j-1) )*0.5 |
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enddo |
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enddo |
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do i=1,im |
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dyp(i,2) = dyv(i,1) |
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dyp(i,jm-1) = dyv(i,jm-1) |
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enddo |
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c Compute Area Factor D2P |
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c ----------------------- |
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do j=3,jm-2 |
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do i=1,im |
| 175 |
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d2p(i,j) = 0.5*( dxv(i,j)+dxv(i,j-1) )*dyp(i,j) |
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enddo |
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enddo |
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do i=1,im |
| 179 |
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d2p(i,2) = dxv(i,2) *dyp(i,2) |
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d2p(i,jm-1) = dxv(i,jm-2)*dyp(i,jm-1) |
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enddo |
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undef = getcon('UNDEF') |
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C ********************************************************* |
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C **** Fill Negative Values **** |
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C ********************************************************* |
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do l=1,lm |
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do j=2,jm-1 |
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| 192 |
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im1 = im-1 |
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i = im |
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do ip1=1,im |
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| 196 |
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if( pq(i,j,L).lt.0.0 ) then |
| 197 |
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| 198 |
molod |
1.2 |
qval = pq(i ,j,L)*d2p(i ,j)*dp(i,j,L) |
| 199 |
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array(1) = pq(ip1,j,L)*d2p(ip1,j)*dp(i,j,L) |
| 200 |
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array(2) = pq(im1,j,L)*d2p(im1,j)*dp(i,j,L) |
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molod |
1.1 |
|
| 202 |
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if( j.eq.jm-1 ) then |
| 203 |
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array(3) = -undef |
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else |
| 205 |
molod |
1.2 |
array(3) = pq(i,j+1,L)*d2p(i,j+1)*dp(i,j,L) |
| 206 |
molod |
1.1 |
endif |
| 207 |
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if( j.eq.2 ) then |
| 208 |
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array(4) = -undef |
| 209 |
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else |
| 210 |
molod |
1.2 |
array(4) = pq(i,j-1,L)*d2p(i,j-1)*dp(i,j,L) |
| 211 |
molod |
1.1 |
endif |
| 212 |
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if( L.eq.1 ) then |
| 213 |
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array(5) = -undef |
| 214 |
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else |
| 215 |
molod |
1.3 |
array(5) = pq(i,j,L-1)*d2p(i,j)*dp(i,j,L) |
| 216 |
molod |
1.1 |
endif |
| 217 |
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if( L.eq.lm ) then |
| 218 |
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array(6) = -undef |
| 219 |
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else |
| 220 |
molod |
1.3 |
array(6) = pq(i,j,L+1)*d2p(i,j)*dp(i,j,L) |
| 221 |
molod |
1.1 |
endif |
| 222 |
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| 223 |
molod |
1.3 |
call maxval1 (array,6,-qval,qmax,imax) |
| 224 |
molod |
1.1 |
|
| 225 |
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if( imax.eq.0 ) then |
| 226 |
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sum = 0.0 |
| 227 |
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do m=1,6 |
| 228 |
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if( array(m).gt.0.0 ) sum = sum + array(m) |
| 229 |
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enddo |
| 230 |
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if( sum.gt.-qval ) then |
| 231 |
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fact = 1.0 + qval/sum |
| 232 |
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if( array(1).gt.0 ) pq(ip1,j,L) = pq(ip1,j,L) * fact |
| 233 |
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if( array(2).gt.0 ) pq(im1,j,L) = pq(im1,j,L) * fact |
| 234 |
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if( array(3).gt.0 ) pq(i,j+1,L) = pq(i,j+1,L) * fact |
| 235 |
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if( array(4).gt.0 ) pq(i,j-1,L) = pq(i,j-1,L) * fact |
| 236 |
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if( array(5).gt.0 ) pq(i,j,L-1) = pq(i,j,L-1) * fact |
| 237 |
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if( array(6).gt.0 ) pq(i,j,L+1) = pq(i,j,L+1) * fact |
| 238 |
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pq(i,j,L) = 0.0 |
| 239 |
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else |
| 240 |
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pq(i,j,L) = 0.0 |
| 241 |
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endif |
| 242 |
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else |
| 243 |
jmc |
1.9 |
if( imax.eq.1 ) pq(ip1,j,L) = pq(ip1,j,L) + |
| 244 |
molod |
1.2 |
. pq(i,j,L)*d2p(i,j)/d2p(ip1,j) |
| 245 |
jmc |
1.9 |
if( imax.eq.2 ) pq(im1,j,L) = pq(im1,j,L) + |
| 246 |
molod |
1.2 |
. pq(i,j,L)*d2p(i,j)/d2p(im1,j) |
| 247 |
jmc |
1.9 |
if( imax.eq.3 ) pq(i,j+1,L) = pq(i,j+1,L) + |
| 248 |
molod |
1.2 |
. pq(i,j,L)*d2p(i,j)/d2p(i,j+1) |
| 249 |
jmc |
1.9 |
if( imax.eq.4 ) pq(i,j-1,L) = pq(i,j-1,L) + |
| 250 |
molod |
1.2 |
. pq(i,j,L)*d2p(i,j)/d2p(i,j-1) |
| 251 |
jmc |
1.9 |
if( imax.eq.5 ) pq(i,j,L-1) = pq(i,j,L-1) + |
| 252 |
molod |
1.2 |
. pq(i,j,L)*dp(i,j,L) /dp(i,j,L-1) |
| 253 |
jmc |
1.9 |
if( imax.eq.6 ) pq(i,j,L+1) = pq(i,j,L+1) + |
| 254 |
molod |
1.2 |
. pq(i,j,L)*dp(i,j,L) /dp(i,j,L+1) |
| 255 |
molod |
1.1 |
pq(i,j,L) = 0.0 |
| 256 |
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endif |
| 257 |
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| 258 |
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endif ! End pq<0 Test |
| 259 |
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| 260 |
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im1 = i |
| 261 |
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i = ip1 |
| 262 |
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enddo |
| 263 |
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enddo |
| 264 |
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enddo |
| 265 |
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| 266 |
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return |
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end |
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| 269 |
molod |
1.3 |
subroutine maxval1 (q,im,qval,qmax,imax) |
| 270 |
molod |
1.1 |
C*********************************************************************** |
| 271 |
jmc |
1.9 |
C PURPOSE |
| 272 |
molod |
1.1 |
C Find the location and value of the array element which is greater |
| 273 |
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C than a prescribed value. |
| 274 |
jmc |
1.9 |
C |
| 275 |
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C INPUT |
| 276 |
|
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C q ...... Array Elements |
| 277 |
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C im ..... Dimension of Array q |
| 278 |
molod |
1.1 |
C qval ... Prescribed Value |
| 279 |
jmc |
1.9 |
C |
| 280 |
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C OUTPUT |
| 281 |
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C qmax ... Largest Array element which is greater than qval |
| 282 |
molod |
1.1 |
C imax ... Location of Largest Array Element |
| 283 |
jmc |
1.9 |
C |
| 284 |
molod |
1.1 |
C Note: |
| 285 |
jmc |
1.9 |
C If no array element is larger than qval, then imax = 0 |
| 286 |
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C |
| 287 |
molod |
1.1 |
C*********************************************************************** |
| 288 |
|
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implicit none |
| 289 |
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integer im, i, imax |
| 290 |
molod |
1.4 |
_RL q(im), qmax, qval |
| 291 |
molod |
1.1 |
qmax = qval |
| 292 |
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imax = 0 |
| 293 |
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do i=1,im |
| 294 |
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if( q(i).gt.qmax ) then |
| 295 |
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qmax = q(i) |
| 296 |
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imax = i |
| 297 |
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endif |
| 298 |
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enddo |
| 299 |
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return |
| 300 |
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end |
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