!-------------------------------------- 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 
!version 3 or (at your option) any later version that should be found at: 
!http://collaboration.cmc.ec.gc.ca/science/rpn.comm/license.html 
!
!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.
!You should have received a copy of the License/Disclaimer along with this software; 
!if not, you can write to: EC-RPN COMM Group, 2121 TransCanada, suite 500, Dorval (Quebec), 
!CANADA, H9P 1J3; or send e-mail to service.rpn@ec.gc.ca
!-------------------------------------- LICENCE END --------------------------------------
***FUNCTION TRAPEZ2
*

      REAL FUNCTION TRAPEZ2(DEL,F,N,NM) 5
#include "impnone.cdk"
      INTEGER N, NM, I
      REAL F(N),DEL(NM)
*
*Author
*          L.Garand (1989)
*
*Revision
* 001      G.Pellerin(Mar90)Standard documentation
*
*Object
*          to calculate integrals
*
*Arguments
*
*          - Input -
* DEL      thickness of layers
* F        variable to be integrated
* N        dimension of F
* NM       dimension of DEL
*
**
*
      TRAPEZ2=0.
      DO 10 I=1,NM
  10  TRAPEZ2=TRAPEZ2+(F(I)+F(I+1))/2.*DEL(I)
      RETURN
      END