!-------------------------------------- LICENCE BEGIN ------------------------------------
!Environment Canada - Atmospheric Science and Technology License/Disclaimer,
! version 3; Last Modified: May 7, 2008.
!This is free but copyrighted software; you can use/redistribute/modify it under the terms
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!See the above mentioned License/Disclaimer for more details.
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***S/P DIFVEF
*
SUBROUTINE DIFVEF(D,F,SD,CON,NK,MAX)
*
#include "impnone.cdk"
INTEGER NK, MAX
REAL D(MAX,2),F(NK),SD(NK),CON
*
*Author
* J. Cote (RPN 1983)
*
*Revision
* 001 J. Cote RPN(Nov 1984)SEF version documentation
* 002 M. Lepine - RFE model code revision project (Jan87)
*
*Object
* to prepare the finite-element vertical diffusion operator
*
*Arguments
*
* - Output -
* D vertical diffusion E-F operator (MAX,2)
* D(*,1) lower diagonal
* D(*,2) diagonal
*
* - Input -
* F vertical diffusion coefficient
* SD sigma intervals
* CON multiplicative constant
* NK vertical dimension
* MAX 1st dimension of D
*
*Notes
* Must have NK <= MAX and NK <= 64
*
**
*
REAL SC
INTEGER K
*
IF (NK.GT.MAX.OR.NK.GT.64) THEN
WRITE (6,*) 'NK = ',NK,' MAX = ',MAX,' STOP DANS DIFVEF'
STOP
ENDIF
SC=CON/2.0
D(1,1)=0.0
*
CDIR$ SHORTLOOP
*VDIR LOOPCNT=64
DO 1 K=2,NK
*
D(K,1)=SC*(F(K-1)+F(K))/SD(K-1)
1 D(K-1,2)=-(D(K-1,1)+D(K,1))
*
D(NK,2)=-D(NK,1)
*
RETURN
END