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   !!======================================================================
   !!                     ***  MODULE usrdef_nam   ***
   !!
   !!                     ===  GYRE configuration  ===
   !!
   !! User defined : set the domain characteristics of a user configuration
   !!======================================================================
   !! History :  4.0  ! 2016-03  (S. Flavoni, G. Madec)  Original code
   !!----------------------------------------------------------------------

   !!----------------------------------------------------------------------
   !!   usr_def_nam   : read user defined namelist and set global domain size
   !!   usr_def_hgr   : initialize the horizontal mesh
   !!----------------------------------------------------------------------
   USE dom_oce
   USE par_oce        ! ocean space and time domain
   USE phycst         ! physical constants
   !
   USE in_out_manager ! I/O manager
   USE lib_mpp        ! MPP library

   IMPLICIT NONE
   PRIVATE

   PUBLIC   usr_def_nam   ! called in nemogcm.F90 module

   !                              !!* namusr_def namelist *!!
   LOGICAL, PUBLIC ::   ln_bench   ! =T benchmark test with gyre: the gridsize is constant (no need to adjust timestep or viscosity)
   INTEGER, PUBLIC ::   nn_GYRE    ! 1/nn_GYRE = the resolution chosen in degrees and thus defining the horizontal domain size

   !!----------------------------------------------------------------------
   !! NEMO/OCE 4.0 , NEMO Consortium (2018)
   !! $Id: usrdef_nam.F90 14433 2021-02-11 08:06:49Z smasson $
   !! Software governed by the CeCILL license (see ./LICENSE)
   !!----------------------------------------------------------------------
CONTAINS

   SUBROUTINE usr_def_nam( cd_cfg, kk_cfg, kpi, kpj, kpk, ldIperio, ldJperio, ldNFold, cdNFtype )
      !!----------------------------------------------------------------------
      !!                     ***  ROUTINE dom_nam  ***
      !!
      !! ** Purpose :   read user defined namelist and define the domain size
      !!
      !! ** Method  :   read in namusr_def containing all the user specific namelist parameter
      !!
      !!                Here GYRE configuration
      !!
      !! ** input   : - namusr_def namelist found in namelist_cfg
      !!----------------------------------------------------------------------
      CHARACTER(len=*), INTENT(out) ::   cd_cfg               ! configuration name
      INTEGER         , INTENT(out) ::   kk_cfg               ! configuration resolution
      INTEGER         , INTENT(out) ::   kpi, kpj, kpk        ! global domain sizes
      LOGICAL         , INTENT(out) ::   ldIperio, ldJperio   ! i- and j- periodicity
      LOGICAL         , INTENT(out) ::   ldNFold              ! North pole folding
      CHARACTER(len=1), INTENT(out) ::   cdNFtype             ! Folding type: T or F
      !
      INTEGER ::   ios   ! Local integer
      !!
      NAMELIST/namusr_def/ nn_GYRE, ln_bench, jpkglo
      !!----------------------------------------------------------------------
      !
      READ  ( numnam_cfg, namusr_def, IOSTAT = ios, ERR = 902 )
902   IF( ios /= 0 )   CALL ctl_nam ( ios , 'namusr_def in configuration namelist' )
      !
      IF(lwm)   WRITE( numond, namusr_def )
      !
      cd_cfg = 'GYRE'               ! name & resolution (not used)
      kk_cfg = nn_GYRE
      !
      kpi = 30 * nn_GYRE + 2       !
      kpj = 20 * nn_GYRE + 2
      kpk = jpkglo
      !                             ! Set the lateral boundary condition of the global domain
      ldIperio = .FALSE.   ;   ldJperio = .FALSE.   ! GYRE configuration : closed domain
      ldNFold  = .FALSE.   ;   cdNFtype = '-'
      !
      !                             ! control print
      IF(lwp) THEN
         WRITE(numout,*) '   '
         WRITE(numout,*) 'usr_def_nam  : read the user defined namelist (namusr_def) in namelist_cfg'
         WRITE(numout,*) '~~~~~~~~~~~ '
         WRITE(numout,*) '   Namelist namusr_def : GYRE case'
         WRITE(numout,*) '      GYRE used as Benchmark (=T)                      ln_bench  = ', ln_bench
         WRITE(numout,*) '      inverse resolution & implied domain size         nn_GYRE   = ', nn_GYRE
         WRITE(numout,*) '      Ni0glo = 30*nn_GYRE                              Ni0glo = ', kpi
         WRITE(numout,*) '      Nj0glo = 20*nn_GYRE                              Nj0glo = ', kpj
         WRITE(numout,*) '      number of model levels                           jpkglo = ', kpk
         WRITE(numout,*) '   '
      ENDIF
      !
   END SUBROUTINE usr_def_nam

   !!======================================================================
END MODULE usrdef_nam
