! $Id: iniconst.F90 5117 2024-07-24 14:23:34Z abarral $

SUBROUTINE iniconst

  USE control_mod
  USE IOIPSL
  USE comconst_mod, ONLY: im, imp1, jm, jmp1, lllm, lllmm1, lllmp1, &
                          unsim, pi, r, kappa, cpp, dtvr, dtphys
  USE comvert_mod, ONLY: disvert_type, pressure_exner
  
  IMPLICIT NONE

  !      P. Le Van

  !   Declarations:
  !   -------------

  include "dimensions.h"
  include "paramet.h"
  include "iniprint.h"

  CHARACTER(LEN=*),parameter :: modname="iniconst"
  CHARACTER(LEN=80) :: abort_message



  !-----------------------------------------------------------------------
  !   dimension des boucles:
  !   ----------------------

  im      = iim
  jm      = jjm
  lllm    = llm
  imp1    = iim 
  jmp1    = jjm + 1
  lllmm1  = llm - 1
  lllmp1  = llm + 1

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

  dtphys  = iphysiq * dtvr
  unsim   = 1./iim
  pi      = 2.*ASIN( 1. )

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

  r       = cpp * kappa

  WRITE(lunout,*) trim(modname),': R  CP  Kappa ',r,cpp,kappa

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

  ! vertical discretization: default behavior depends on planet_type flag
  IF (planet_type=="earth") THEN
     disvert_type=1
  else
     disvert_type=2
  ENDIF
  ! but user can also specify using one or the other in run.def:
  CALL getin('disvert_type',disvert_type)
  WRITE(lunout,*) trim(modname),': disvert_type=',disvert_type

  pressure_exner = disvert_type == 1 ! default value
  CALL getin('pressure_exner', pressure_exner)

  IF (disvert_type==1) THEN
     ! standard case for Earth (automatic generation of levels)
     CALL disvert()
  ELSE IF (disvert_type==2) THEN
     ! standard case for planets (levels generated using z2sig.def file)
     CALL disvert_noterre
  else
     WRITE(abort_message,*) "Wrong value for disvert_type: ", disvert_type
     CALL abort_gcm(modname,abort_message,0)
  ENDIF

END SUBROUTINE iniconst