! +-======-+ 
!  Copyright (c) 2003-2007 United States Government as represented by 
!  the Admistrator of the National Aeronautics and Space Administration.  
!  All Rights Reserved.
!  
!  THIS OPEN  SOURCE  AGREEMENT  ("AGREEMENT") DEFINES  THE  RIGHTS  OF USE,
!  REPRODUCTION,  DISTRIBUTION,  MODIFICATION AND REDISTRIBUTION OF CERTAIN 
!  COMPUTER SOFTWARE ORIGINALLY RELEASED BY THE UNITED STATES GOVERNMENT AS 
!  REPRESENTED BY THE GOVERNMENT AGENCY LISTED BELOW ("GOVERNMENT AGENCY").  
!  THE UNITED STATES GOVERNMENT, AS REPRESENTED BY GOVERNMENT AGENCY, IS AN 
!  INTENDED  THIRD-PARTY  BENEFICIARY  OF  ALL  SUBSEQUENT DISTRIBUTIONS OR 
!  REDISTRIBUTIONS  OF THE  SUBJECT  SOFTWARE.  ANYONE WHO USES, REPRODUCES, 
!  DISTRIBUTES, MODIFIES  OR REDISTRIBUTES THE SUBJECT SOFTWARE, AS DEFINED 
!  HEREIN, OR ANY PART THEREOF,  IS,  BY THAT ACTION, ACCEPTING IN FULL THE 
!  RESPONSIBILITIES AND OBLIGATIONS CONTAINED IN THIS AGREEMENT.
!  
!  Government Agency: National Aeronautics and Space Administration
!  Government Agency Original Software Designation: GSC-15354-1
!  Government Agency Original Software Title:  GEOS-5 GCM Modeling Software
!  User Registration Requested.  Please Visit http://opensource.gsfc.nasa.gov
!  Government Agency Point of Contact for Original Software:  
!  			Dale Hithon, SRA Assistant, (301) 286-2691
!  
! +-======-+ 
!~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!       NASA/GSFC, Data Assimilation Office, Code 910.3, GEOS/DAS      !
!BOP -------------------------------------------------------------------
!
! !ROUTINE: mpi_reduce -
!
! !DESCRIPTION:
!
! !INTERFACE:

    subroutine mpi_reduce(sbuf,rbuf,count,dtype,op,	&
	root,comm,ierror)
      use m_mpi0,only : mpi0_initialized
      implicit none
      integer,dimension(*),intent(in) :: sbuf
      integer,dimension(*),intent(out):: rbuf
      integer,             intent(in) :: count
      integer,		   intent(in) :: dtype

      integer,		   intent(in) :: op
      integer,		   intent(in) :: root
      integer,		   intent(in) :: comm
      integer,		   intent(out):: ierror

! !REVISION HISTORY:
! 	29Sep99	- Jing Guo <guo@dao.gsfc.nasa.gov>
!		- initial prototype/prolog/code
!EOP ___________________________________________________________________

  character(len=*),parameter :: myname='mpi_reduce'

  if(.not.mpi0_initialized) call mpi_init(ierror)

  call mpi0_copy(sbuf,count,dtype,rbuf,count,dtype,ierror)

end subroutine mpi_reduce