MODULE usrdef_sbc
   !!======================================================================
   !!                       ***  MODULE usrdef_sbc  ***
   !! 
   !!                  ===  ISOMIP configuration  ===
   !!
   !! User defined :   surface forcing of a user configuration
   !!======================================================================
   !! History :  4.0   ! 2016-03  (S. Flavoni, G. Madec)   user defined interface
   !!                  ! 2017-02  (P. Mathiot, S. Flavoni) adapt code to ISOMIP case
   !!----------------------------------------------------------------------

   !!----------------------------------------------------------------------
   !!   usr_def_sbc    : user defined surface bounday conditions in ISOMIP case
   !!----------------------------------------------------------------------
   USE oce             ! ocean dynamics and tracers
   USE dom_oce         ! ocean space and time domain
   USE sbc_oce         ! Surface boundary condition: ocean fields
   USE sbc_ice         ! Surface boundary condition: ice fields
   USE phycst          ! physical constants
   !
   USE in_out_manager  ! I/O manager
   USE lib_mpp         ! distribued memory computing library
   USE lbclnk          ! ocean lateral boundary conditions (or mpp link)
   USE lib_fortran     ! Fortran utilities (allows no signed zero when 'key_nosignedzero' defined) 

   IMPLICIT NONE
   PRIVATE

   PUBLIC   usrdef_sbc_oce      ! routine called in sbcmod module
   PUBLIC   usrdef_sbc_ice_tau  ! routine called by icestp.F90 for ice dynamics
   PUBLIC   usrdef_sbc_ice_flx  ! routine called by icestp.F90 for ice thermo

   !! * Substitutions
#  include "vectopt_loop_substitute.h90"
   !!----------------------------------------------------------------------
   !! NEMO/OCE 4.0 , NEMO Consortium (2018)
   !! $Id: usrdef_sbc.F90 10074 2018-08-28 16:15:49Z nicolasmartin $
   !! Software governed by the CeCILL license (see ./LICENSE)
   !!----------------------------------------------------------------------
CONTAINS

   SUBROUTINE usrdef_sbc_oce( kt )
      !!---------------------------------------------------------------------
      !!                    ***  ROUTINE usr_def_sbc  ***
      !!              
      !! ** Purpose :   provide at each time-step the surface boundary
      !!              condition, i.e. the momentum, heat and freshwater fluxes.
      !!
      !! ** Method  :   all 0 fields, for ISOMIP case
      !!                CAUTION : never mask the surface stress field !
      !!
      !! ** Action  : - set to ZERO all the ocean surface boundary condition, i.e.   
      !!                   utau, vtau, taum, wndm, qns, qsr, emp, sfx
      !!
      !!----------------------------------------------------------------------
      INTEGER, INTENT(in) ::   kt   ! ocean time step
      !!---------------------------------------------------------------------
      !
      !
      IF (kt == nit000) THEN
         IF(lwp) WRITE(numout,*)' usr_sbc : ISOMIP case: NO surface forcing'
         IF(lwp) WRITE(numout,*)' ~~~~~~~~~~~   utau = vtau = taum = wndm = qns = qsr = emp = sfx = 0'
      END IF
      !
      utau(:,:) = 0._wp
      vtau(:,:) = 0._wp
      taum(:,:) = 0._wp
      wndm(:,:) = 0._wp
      !
      emp (:,:) = 0._wp
      sfx (:,:) = 0._wp
      qns (:,:) = 0._wp
      qsr (:,:) = 0._wp
      !         
   END SUBROUTINE usrdef_sbc_oce

   SUBROUTINE usrdef_sbc_ice_tau( kt )
      INTEGER, INTENT(in) ::   kt   ! ocean time step
   END SUBROUTINE usrdef_sbc_ice_tau

   SUBROUTINE usrdef_sbc_ice_flx( kt )
      INTEGER, INTENT(in) ::   kt   ! ocean time step
   END SUBROUTINE usrdef_sbc_ice_flx

   !!======================================================================
END MODULE usrdef_sbc