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!

      subroutine apreobs 3,3
#if defined (DOC)
*
***s/r apreobs  - Build adjoint of derived fields assimilated. ADJ of lpreobs.
*
*
*Author  : L. Fillion *ARMA/AES  7 oct 98
*
*Revision: L. Fillion *ARMA/AES  25 nov 98
*        - Option ES or LQ humidity analysis
*Revision: C. Charette *ARMA/AES  09 dec 98
*        - GOMES added to GOMQ when humidity analysis variable is T-Td
*Revision: L. Fillion *ARMA/EC  10 Feb 2010 - Conditionally calls att2phi
*
*          Bin He   - ARMA/MRB   - Oct. 2011,
*                   - 4Dvar optimization.

*     -------------------
**    Purpose: Used in evaluation of Jo and Grad Jo
*
*Arguments
#endif
      USE modfgat,only : istepobs,nobs,notag
      IMPLICIT NONE
*implicits
#include "comdim.cdk"
#include "comcva.cdk"
#include "comdimo.cdk"
#include "commvo.cdk"
#include "comstate.cdk"
*modules
*
**
      INTEGER JLEV,JOBS,iobs

      if(nobs(istepobs)==0)return 
C
C*1   Adjoint of ltt2phi
C     ------------------
C

 100  CONTINUE
      if((.not.lsw).and.(NMVOEXIST(NOGZ).eq.1)) call att2phi
C
C*2   Adjoint of sensitivity of (T-Td) to sensitivity on control vector
C     -----------------------------------------------------------------
C
 200  CONTINUE
      if(chum.eq.'LQ') then
        call amhu2es
      endif
C
      IF(CHUM .EQ. 'ES') THEN
         DO IOBS=1,nobs(istepobs) 
           JOBS=notag(iobs,istepobs) 
             GOMQ(1:NFLEV,JOBS) = GOMQ(1:NFLEV,JOBS) + GOMES(1:NFLEV,JOBS)
         ENDDO
      ENDIF
C

      RETURN
      END