CCC $Header$ 
CCC  TOP 1.0 , LOCEAN-IPSL (2005) 
C This software is governed by CeCILL licence see modipsl/doc/NEMO_CeCILL.txt 
C ---------------------------------------------------------------------------
      SUBROUTINE trcrst
CCC---------------------------------------------------------------------
C
CCC
CCC                       ROUTINE trcrst
CCC                     ******************
CCC
CCC  PURPOSE :
CCC  ---------
CCC     READ files for restart for passive tracer
CCC
CC   METHOD :
CC   -------
CC      READ the previous fields on the FILE nutrst
CC      the first record indicates previous characterics
CC      after control with the present run, we READ :
CC      - prognostic variables on the second and more record
CC
CC   INPUT :			  no
CC   -----
CC      COMMON
CC            /citrst/          : restart PARAMETER
CC            /comctl/          : parameters for the control
CC
CC   OUTPUT :
CC   ------
CC      argument                : no
CC      COMMON
CC            /cottrc/          : passive tracers fields now
CC                                and before 
CC
CC   WORKSPACE :		  no
CC   ---------
CC      ji,jj,jk,jl
CC      ino0,it0,ipcg0,isor0,itke0,ino1,it1,isor1,ipcg1,itke1,idast1
CC      iarak0,iarak1
CC
CC   MODIFICATIONS:
CC   --------------
CC      original  : 96-11
CC      additions : 00-05 (A. Estublier) TVD Limiter Scheme
CC                                       key_trc_tvd
CC                  00-12 (O. Aumont, E. Kestenare) read restart file 
CC                                                  for sediments                
CC                  01-05 (O. Aumont, E. Kestenare) read restart file 
CC                                   for calcite and silicate sediments
CC----------------------------------------------------------------------
CC parameters and commons
CC ======================
CDIR$ NOLIST
#if defined key_mpp
c no ioipsl
#include "trcrst.mpp.h"
#    else
CDIR$ NOLIST
      USE ioipsl
      USE oce_trc
      USE trc
      USE sms
      USE trctrp_lec
      IMPLICIT NONE
CDIR$ LIST
#if defined key_passivetrc
CC----------------------------------------------------------------------
CC local declarations
CC ==================
      INTEGER ino0,ino1,it0,it1,jn,iarak0,iarak1
      INTEGER ji, jj, jk
      INTEGER itime, ibvar
      REAL zdate0, zinfo(3)
      CHARACTER*32 clname,clname1,clname2
      LOGICAL clog
      CHARACTER*8 clvnames(30)
      REAL caralk,bicarb

C
C
C 0. initialisations
C ------------------
C
      ino0 =no
      it0  =nit000
C
      IF( ln_trcadv_cen2 .OR. ln_trcadv_tvd ) THEN
          iarak0 = 1
      ELSE
          iarak0=0
      ENDIF

C
      IF(lwp) THEN
          WRITE(numout,*) ' '
          WRITE(numout,*) ' *** trcrst beginning of restart for'
          WRITE(numout,*) ' passive tracer'
          WRITE(numout,*) ' the present run :'
          WRITE(numout,*) '   number job is  : ',no
          WRITE(numout,*) '   with the time nit000 : ',nit000
          IF(iarak0.eq.1) then
              WRITE(numout,*) '   and before fields for Arakawa sheme '
          ENDIF 
          WRITE(numout,*) ' '
      ENDIF
C
C 1. READ nutrst
C --------------
C
C ... first information
C
      clname='restart.trc'
      itime=0
      clog=.false.
      CALL restini(clname,jpi,jpj,glamt,gphit,jpk,gdept,clname
     $    ,itime,zdate0,rdt,nutrst)
C
      CALL ioget_vname(nutrst, ibvar, clvnames)
      CALL restget(nutrst,'info',1,1,3,0,clog,zinfo)
      ino1  = nint(zinfo(1))
      it1   = nint(zinfo(2))
      iarak1 = nint(zinfo(3))
C
      IF(lwp) THEN
          WRITE(numout,*) ' '
          WRITE(numout,*) ' READ nutrst with '
          WRITE(numout,*) '   number job is  : ',ino1
          WRITE(numout,*) '   with the time it : ',it1
          IF(iarak1.eq.1) then
              WRITE(numout,*) '   and before fields for Arakawa sheme '
          ENDIF 
          WRITE(numout,*) '   number of variables   : ', ibvar
          WRITE(numout,*) '   NetCDF variables      : '
          WRITE(numout,*) ' ',clvnames (:ibvar)
          WRITE(numout,*) ' '
      ENDIF
C
C 1.2 control of date
C
      IF((it0-it1).ne.1.and.abs(nrsttr).eq.1) THEN
          IF(lwp) THEN
              WRITE(numout,*) ' ===>>>> : problem with nit000 for the',
     $            ' passive tracer restart'
              WRITE(numout,*) ' =======                              ',
     $            ' ======================'
              WRITE(numout,*) ' we stop. verify the FILE'
              WRITE(numout,*) ' or rerun with the value  0 for the'
              WRITE(numout,*) ' control of time PARAMETER   nrstdt'
              WRITE(numout,*) ' '
          ENDIF
          STOP 'trcrst'
      ENDIF
C
C 1.3 Control of the sheme
C
      IF(iarak0.ne.iarak1) THEN
          IF(lwp) THEN
              WRITE(numout,*) ' ===>>>> : problem with the',
     $            ' passive tracer restart file'
              WRITE(numout,*) ' =======                              ',
     $            ' ==========================='
              WRITE(numout,*) ' we stop. verify the FILE'
              WRITE(numout,*) ' before field required IF 1=',iarak0
              WRITE(numout,*) ' before field present in file IF 1=',
     $            iarak1
              WRITE(numout,*) ' '
          ENDIF
          STOP 'trcrst'
      ENDIF

C
C ... READ prognostic variables and computes diagnostic variable
C
       DO jn=1,jptra
         clname='TRN'//ctrcnm(jn)
         CALL restget(nutrst,clname,jpi,jpj,jpk,0,clog,trn(:,:,:,jn))
       END DO

       DO jn=1,jptra
         clname='TRB'//ctrcnm(jn)
         CALL restget(nutrst,clname,jpi,jpj,jpk,0,clog,trb(:,:,:,jn))
       END DO

#     if defined key_trc_hamocc3
         clname='SED'//ctrcnm(jppoc)
         clname1='SED'//ctrcnm(jpcal)
         clname2='SED'//ctrcnm(jpsil)
         CALL restget(nutrst,clname1,jpi,jpj,1,0,clog,sedcal(:,:))
         CALL restget(nutrst,clname2,jpi,jpj,1,0,clog,sedsil(:,:))
         CALL restget(nutrst,clname,jpi,jpj,1,0,clog,sedpoc(:,:))
#     elif defined key_trc_npzd || defined key_trc_lobster1
         clname='SED'//ctrcnm(jpdet)
         CALL restget(nutrst,clname,jpi,jpj,1,0,clog,sedpoc(:,:))
#     elif defined key_trc_pisces
C
         clname='Silicalim'
         CALL restget(nutrst,clname,jpi,jpj,1,0,clog,xksi)
         xksimax=xksi
C
         clname='SED'//ctrcnm(jppoc)
         clname1='SED'//ctrcnm(jpcal)
         clname2='SED'//ctrcnm(jpsil)
         CALL restget(nutrst,clname1,jpi,jpj,1,0,clog,sedcal(:,:))
         CALL restget(nutrst,clname2,jpi,jpj,1,0,clog,sedsil(:,:))
         CALL restget(nutrst,clname,jpi,jpj,1,0,clog,sedpoc(:,:))
#     endif

#if defined key_trc_hamocc3 || defined key_trc_pisces 

C
C  Initialization of chemical variables of the carbon cycle
C  --------------------------------------------------------
C
        DO jk = 1,jpk
          DO jj = 1,jpj
            DO ji = 1,jpi
              caralk = trn(ji,jj,jk,jptal)-
     &                 borat(ji,jj,jk)/(1.+1.E-8/(rtrn+akb3(ji,jj,jk)))
              co3(ji,jj,jk)=(caralk-trn(ji,jj,jk,jpdic))*tmask(ji,jj,jk)
     &           +(1.-tmask(ji,jj,jk))*.5e-3
              bicarb = (2.*trn(ji,jj,jk,jpdic)-caralk)
              hi(ji,jj,jk) = (ak23(ji,jj,jk)*bicarb/co3(ji,jj,jk))
     &           *tmask(ji,jj,jk)+(1.-tmask(ji,jj,jk))*1.e-9
              h2co3(ji,jj) = 1.e-5
            ENDDO
          ENDDO
        ENDDO
#endif

#else
C
C no passive tracers
C
#endif
C
#endif
C
      RETURN
      END