MODULE trcsms_pisces
   !!======================================================================
   !!                         ***  MODULE trcsms_pisces  ***
   !! TOP :   PISCES Source Minus Sink manager
   !!======================================================================
   !! History :   1.0  !  2004-03 (O. Aumont) Original code
   !!             2.0  !  2007-12  (C. Ethe, G. Madec)  F90
   !!----------------------------------------------------------------------
#if defined key_pisces
   !!----------------------------------------------------------------------
   !!   'key_pisces'                                       PISCES bio-model
   !!----------------------------------------------------------------------
   !!   trcsms_pisces        :  Time loop of passive tracers sms
   !!----------------------------------------------------------------------
   USE oce_trc         !
   USE trp_trc
   USE sms
   USE lbclnk
   USE lib_mpp
   
   USE p4zint          ! 
   USE p4zche          ! 
   USE p4zbio          ! 
   USE p4zsed          ! 
   USE p4zlys          ! 
   USE p4zflx          ! 

   IMPLICIT NONE
   PRIVATE

   PUBLIC   trc_sms_pisces    ! called in trcsms.F90

   !!----------------------------------------------------------------------
   !! NEMO/TOP 2.0 , LOCEAN-IPSL (2007) 
   !! $Header:$ 
   !! Software governed by the CeCILL licence (modipsl/doc/NEMO_CeCILL.txt)
   !!----------------------------------------------------------------------

CONTAINS

   SUBROUTINE trc_sms_pisces( kt )
      !!---------------------------------------------------------------------
      !!                     ***  ROUTINE trc_sms_pisces  ***
      !!
      !! ** Purpose :   Managment of the call to Biological sources and sinks 
      !!              routines of PISCES bio-model
      !!
      !! ** Method  : - at each new day ...
      !!              - several calls of bio and sed ???
      !!              - ...
      !!---------------------------------------------------------------------
      INTEGER, INTENT( in ) ::   kt      ! ocean time-step index      
      !!
      INTEGER ::   jnt, jn
      INTEGER ::   iyy, imm, idd


      !!---------------------------------------------------------------------


      iyy = ndastp/10000
      imm = (ndastp - iyy*10000)/100
      idd = (ndastp - iyy*10000 - imm*100)

      IF( ndayflxtr /= idd) THEN      ! New days
         !
         ndayflxtr = idd

         CALL p4z_che          ! computation of chemical constants

         CALL p4z_int          ! computation of various rates for biogeochemistry
         !
      ENDIF


      DO jnt = 1, nrdttrc          ! Potential time splitting if requested
         !
         CALL p4z_bio (kt, jnt)    ! Compute soft tissue production (POC)


         CALL p4z_sed (kt, jnt)    ! compute soft tissue remineralisation

         !
         trb(:,:,:,:) = trn(:,:,:,:)
         !
      END DO

      CALL p4z_lys( kt )             ! Compute CaCO3 saturation

      CALL p4z_flx( kt )             ! Compute surface fluxes


      DO jn = jp_pcs0, jp_pcs1
        CALL lbc_lnk( trn(:,:,:,jn), 'T', 1. )
        CALL lbc_lnk( trb(:,:,:,jn), 'T', 1. )
        CALL lbc_lnk( tra(:,:,:,jn), 'T', 1. )
      END DO
      !
   END SUBROUTINE trc_sms_pisces

#else
   !!======================================================================
   !!  Dummy module :                                   No PISCES bio-model
   !!======================================================================
CONTAINS
   SUBROUTINE trc_sms_pisces( kt )                   ! Empty routine
      INTEGER, INTENT( in ) ::   kt
      WRITE(*,*) 'trc_sms_pisces: You should not have seen this print! error?', kt
   END SUBROUTINE trc_sms_pisces
#endif 

   !!======================================================================
END MODULE trcsms_pisces