!copyright (C) 2001  MSC-RPN COMM  %%%RPNPHY%%%
***S/P SERKH
*

      SUBROUTINE SERKH ( BSQ , GSURR , KT , WORK , J , N , NK ),2
*
#include "impnone.cdk"
      INTEGER J,N,NK
      REAL BSQ(N,NK) , GSURR , KT(NK) , WORK(N,NK)
*
*Author
*          R. Benoit (RPN 1984)
*
*Revision
* 001      J. Cote RPN (Jan 1985)
*          Recoding version to be compatible with SEF/RFE
*          Documentation
* 002      M. Lepine - Revision project of RFE model
* 003      B. Bilodeau (July1991) adaptation to UNIX
*
*Object
*          to extract KH (Cressman/RFE)
*
*Arguments
*
*          - Input -
* BSQ      (sigma/temperature)**2
* GSURR    GRAV/RGAS
* KT       operator profile of vertical diffusion of temperature in Z
*          coordinates (Cressman/RFE)
* WORK     work space
* J        latitude of extraction, all stations if J=0
* N        horizontal dimension of extracted fields
* NK       vertical dimension
*
*Notes
*          See SERDBU for more information
*
*
*IMPLICITES
*
#include "sercmdk.cdk"
*
*MODULES
*
      EXTERNAL MZONXST, SERXST
*
**
*
      INTEGER IJ,K
      REAL CON
*
      IF (NSTAT.LE.0) RETURN
*
      CON = GSURR**2
*
      CALL SERXST ( 0.0 , 'KH' , J , N , 0.0 , 1.0 , 0 )
*
      DO 1 IJ = 1,N
         DO 1 K=1,NK
    1       WORK(IJ,K) = BSQ(IJ,K)*CON*KT(K)
*
      CALL SERXST ( WORK , 'KH' , J , N , 0.0 , 1.0 , -1 )
      CALL MZONXST ( WORK, 'KH', J, N, HEURE, 1.0, -1, 1 )
*
      RETURN
      END