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! version 3; Last Modified: May 7, 2008.
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!
subroutine simvar(na_indic,na_dim,da_v,da_J,da_gradJ) 6,21
use oda_shared
, only : dg_vbar
use mod4dv, only : l4dvar
use modstag, only : lstagwinds
USE procs_topo
USE modfgat
implicit none
! Argument declarations
integer :: na_dim ! Dimension of the control vector in forecast error coraviances space
! Value of na_indic
! Note: 1 and 4 are reserved values for call back from m1qn3.
! For direct calls use other value than 1 and 4.
! =1 No action taken; =4 Both J(u) and its gradient are computed.
! =2 Same as 4 (compute J and gradJ) but do not interrupt timer of the
! minimizer.
! =3 Compute Jo and gradJo only.
integer :: na_indic
real*8 :: da_J ! Cost function of the Variational algorithm
real*8, dimension(na_dim) :: da_gradJ ! Gradient of the Variational Cost funtion
real*8, dimension(na_dim) :: da_v ! Control variable in forecast error covariances space
!
! Purpose: Implement the Variational solver as described in
! Courtier, 1997, Dual formulation of four-dimentional variational assimilation,
! Q.J.R., pp2449-2461.
!
! Author : Simon Pellerin *ARMA/MSC October 2005
! (Based on previous versions of evaljo.ftn, evaljg.ftn and evaljgns.ftn).
!
! Revisions:
! L. Fillion, ARMA/EC, 5 Jun 2009. Introduce 1 Obs experiment.
! L. Fillion, ARMA/EC, 11 May 2010. Limit writing diagnostics to processor 0.
! Bin He - ARMA/MRB - Oct. 2011,
! - 4Dvar optimization.
! M. Tanguay - ARMN/MRB - Avr. 2012,
! - Impose treatment of profils in increasing time step
! instead availability of profils at the last time step
! in order to assure that the diagnostics are always written
! in the same order in the listings.
! The original treatment can always be ractivated after testing.
!
#include "comlun.cdk"
#include "comvarqc.cdk"
#include "comoabdy.cdk"
#include "comdim.cdk"
#include "comdimo.cdk"
#include "comcva.cdk"
#include "comoba.cdk"
#include "cvcord.cdk"
#include "commvo.cdk"
! Local declaration
integer :: nl_ilev, ierr,nl_err
real*8, dimension(na_dim) :: dl_v
real*8 :: dl_Jb, dl_Jo
integer :: i, iobs,jobs,istep
integer :: ierr
logical :: isExist
logical :: llfirst=.true.
if (na_indic .eq. 1 .or. na_indic .eq. 4) call tmg_stop (21)
call tmg_start(31,'SIMVAR')
llfirst=.true.
if (na_indic .ne. 1) then ! No action taken if na_indic == 1
nsim3d = nsim3d + 1
IF(myid == 0) write(nulout,*) 'Entering simvar for simulation ',nsim3d
dl_v = da_v + dg_vbar !dg_vbar = sum(v) of previous outer-loops
! Computation of vTv/2 term
dl_Jb = dot_product(dl_v,dl_v)/2.d0
call oda_sqrtB(da_v,na_dim)
!!=================>>>
icount=0
DO istep = 1,nstepobs
if(L4DVAR) then
if(istep == 1 .and. llfirst.and.myid ==0) write(nulout,*) 'Looking for the last step file: ',trim(TL_prof_file)
inquire(file=trim(TL_prof_file),exist=isExist)
!!! if(isExist .and. llfirst) then
if(.FALSE.) then
if(myid ==0) write(nulout,*) 'Start backward treatment of Profiles from ISTEPOBS_LAST =',istepobs_last,' to ISTEP = ',istep
do i=istep,nstepobs
astepobs(i)=nstepobs+istep-i
enddo
llfirst=.false.
endif
endif ! L4DVAR
istepobs=astepobs(istep)
if(myid == 0) write(nulout,*) 'istepobs= ',istepobs
icount=icount+1
call oda_L
call tmg_start(2,'OBS-OPER')
call oda_H ! Modify NCMOMA ! Hdx
call oda_res ! Modify NCMOMA : Hdx-d
call oda_sqrtRm1(ncmoma,ncmoma) ! Modify NCMOMA : R**-1/2*(Hdx-d)
call oda_Jo ! Store J in NCMOMI : R**-1(Hdx-d)**2
!!==>>call tmg_start(2,'OBS-OPER') !
IF (LVARQC) THEN
! Store modify J in NCMOMI : -ln((gamma-exp(J))/(gamma+1))
call oda_qcv
ENDIF
call getLocCMA(robdata8_loc)
IF(icount == nstepobs) THEN
dl_Jo = 0.d0
call oda_sumJo(dl_Jo,robdata8_loc,ndata)
if(ndata>0) robdata8_loc=0.0
da_J = dl_Jb + dl_Jo
if (na_indic .eq. 3) then
da_J = dl_Jo
IF(myid == 0) write(nulout,FMT='(6X,"SIMVAR: JO = ",G23.16,6X)') dl_Jo
else
da_J = dl_Jb + dl_Jo
IF(myid == 0) write(nulout,FMT='(6X,"SIMVAR: Jb = ",G23.16,6X,"JO = ",G23.16,6X,"Jt = ",G23.16)') dl_Jb,dl_Jo,da_J
endif
ENDIF !!
call oda_sqrtRm1(ncmomi,ncmoma)
IF (LVARQC) THEN
call oda_qcvad
ENDIF
DO iobs=1,nobs(istepobs)
jobs=notag(iobs,istepobs)
GOMOBS(:,jobs)=0.0
ENDDO !!
call oda_HT
call tmg_stop(2)
call oda_LTa
enddo !! loop istep
call oda_LTb
CALL TRANSFER('ZSP0')
da_gradJ = 0.d0
call oda_sqrtBT(da_gradJ,na_dim)
if (na_indic .ne. 3) then
da_gradJ = dl_v + da_gradJ
endif
endif
call tmg_stop(31)
if (na_indic .eq. 1 .or. na_indic .eq. 4) call tmg_start(21,'QN')
!--- Restore the array astepobs if l4dvar=.true..
IF(L4DVAR) THEN
do i=1,nstepobs
astepobs(i)=i
enddo
ENDIF
WRITE(nulout,*) ' ======Leave SIMVAR=========='
CONTAINS
subroutine getLocCMA(robdata8_loc) 1
!
!
real*8,dimension(*) :: robdata8_loc
integer :: jfle ,jdata
do jfle=1,NFILES
DO JDATA=nstart(istepobs,jfle),nend(istepobs,jfle)
if(jdata >0 ) robdata8_loc(jdata)=ROBDATA8(NCMOMI,JDATA)
enddo
enddo
end subroutine getLocCMA
end subroutine simvar