!-------------------------------------- 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
!of the Environment Canada - Atmospheric Science and Technology License/Disclaimer
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!
!This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
!without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
!See the above mentioned License/Disclaimer for more details.
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!-------------------------------------- LICENCE END --------------------------------------
***S/P DVRTDF
*
SUBROUTINE DVRTDF ( R , X , DS, N , MR , MX , NK ) 8
*
#include "impnone.cdk"
INTEGER N, MR, MX, NK
REAL R(MR,NK),X(MX,NK),DS(n,NK)
*
*Author
* R. Benoit RPN(Mar 1989)
*
*Revisions
* 001 R. Benoit (Aug 93) - DS(2D) for Local sigma
*
*Object
* to calculate the vertical derivative by centred finite
* differences
*
*Arguments
*
* - Output -
* R result
*
* - Input -
* X variable to derive
* DS distance between sigma levels 'U'
* N horizontal dimensions
* MR 1st dimension of R
* MX 1st dimension of X
* NK vertical dimension
*
*Notes
* R and X can share the same space, R(*,NK)=0
*
**
*
INTEGER J,K
*
*
DO 30 K=1,NK-1
CDIR$ IVDEP
DO 20 J=1,N
R(J,K)=(X(J,K+1)-X(J,K))/DS(j,K)
20 CONTINUE
*
30 CONTINUE
*
DO 40 J=1,N
R(J,NK)=0
40 CONTINUE
*
RETURN
END