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!                     version 3; Last Modified: May 7, 2008.
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!

      SUBROUTINE oda_qcvad 1,2
      use modmask, only : lmaskgo,lmaskro,lmask
      USE modfgat,only : istepobs,nstart,nend,nobs 
#if defined (DOC)
*
*
*Purpose : Factorizes Grad(Jo) according to Andersson and Jarvinen
*          1999, Variational quality control, Q.J.R., 125,
*          pp. 697-722.
*          It uses the value of (1-Wqc) saved in ROBDATA8(NCMOMN,*)
*          in oda_qcv.ftn
*
*Author  : S. Pellerin, ARMA, January 2009
*          Generalisation of QCVAR originally embeded in adjoint of
*          observation operators from P. Koclas, J. Halle and
*          J. St-James
*
*Revisions :
*          Bin He   - ARMA/MRB   - Oct. 2011,
*                   - 4Dvar optimization.

*
#endif
      IMPLICIT NONE
*implicits
#include "comdimo.cdk"
#include "comoabdy.cdk"
#include "comoahdr.cdk"
#include "comoba.cdk"
#include "cvcord.cdk"
*
      INTEGER j,JDATA,jfle 
      logical :: llmask(ndata)
      llmask = lmask .neqv. lmaskgo  ! Exclusion of GOES QCVAR
      llmask = llmask .neqv. lmaskro ! Exclusion of GPSRO QCVAR

      IF(nobs(istepobs) == 0) RETURN 
      DO jfle = 1,NFILES 
       DO JDATA=nstart(istepobs,jfle),nend(istepobs,jfle) 
        IF(JDATA > 0) THEN
        IF (llmask(jdata)) THEN
          ROBDATA8(NCMOMI,JDATA) = ROBDATA8(NCMOMI,JDATA)
     &         *(1.d0 - ROBDATA8(NCMOMN,JDATA))
        ENDIF
        ENDIF
      END DO
      END DO
C--------------------------------------------------------------------
      RETURN
      END