!
! $Id: iniphysiq.F 1403 2010-07-01 09:02:53Z fairhead $
!
SUBROUTINE iniphysiq(iim,jjm,nlayer,punjours, pdayref,ptimestep,         &
                     rlatu,rlonv,aire,cu,cv,                             &
                     prad,pg,pr,pcpp,iflag_phys)
  USE dimphy, ONLY: klev ! number of atmospheric levels
  USE mod_grid_phy_lmdz, ONLY: klon_glo ! number of atmospheric columns
                                        ! (on full grid)
  USE mod_phys_lmdz_para, ONLY: klon_omp, & ! number of columns (on local omp grid)
                                klon_omp_begin, & ! start index of local omp subgrid
                                klon_omp_end, & ! end index of local omp subgrid
                                klon_mpi_begin ! start indes of columns (on local mpi grid)
  USE comgeomphy, ONLY: initcomgeomphy, &
                        airephy, & ! physics grid area (m2)
                        cuphy, & ! cu coeff. (u_covariant = cu * u)
                        cvphy, & ! cv coeff. (v_covariant = cv * v)
                        rlond, & ! longitudes
                        rlatd ! latitudes
  USE comcstphy, ONLY: rradius, & ! planet radius (m)
                       rr, & ! recuced gas constant: R/molar mass of atm
                       rg, & ! gravity
                       rcpp  ! specific heat of the atmosphere
  USE phyaqua_mod, ONLY: iniaqua
  IMPLICIT NONE
  !
  !=======================================================================
  !   Initialisation of the physical constants and some positional and 
  !   geometrical arrays for the physics
  !=======================================================================
 
 
  include "iniprint.h"

  REAL,INTENT(IN) :: prad ! radius of the planet (m)
  REAL,INTENT(IN) :: pg ! gravitational acceleration (m/s2)
  REAL,INTENT(IN) :: pr ! ! reduced gas constant R/mu
  REAL,INTENT(IN) :: pcpp ! specific heat Cp
  REAL,INTENT(IN) :: punjours ! length (in s) of a standard day
  INTEGER, INTENT (IN) :: nlayer ! number of atmospheric layers
  INTEGER, INTENT (IN) :: iim ! number of atmospheric coulumns along longitudes
  INTEGER, INTENT (IN) :: jjm  ! number of atompsheric columns along latitudes
  REAL, INTENT (IN) :: rlatu(jjm+1) ! latitudes of the physics grid
  REAL, INTENT (IN) :: rlonv(iim+1) ! longitudes of the physics grid
  REAL, INTENT (IN) :: aire(iim+1,jjm+1) ! area of the dynamics grid (m2)
  REAL, INTENT (IN) :: cu((iim+1)*(jjm+1)) ! cu coeff. (u_covariant = cu * u)
  REAL, INTENT (IN) :: cv((iim+1)*jjm) ! cv coeff. (v_covariant = cv * v)
  INTEGER, INTENT (IN) :: pdayref ! reference day of for the simulation
  REAL,INTENT(IN) :: ptimestep !physics time step (s)
  INTEGER,INTENT(IN) :: iflag_phys ! type of physics to be called

  INTEGER :: ibegin,iend,offset
  INTEGER :: i,j
  CHARACTER (LEN=20) :: modname='iniphysiq'
  CHARACTER (LEN=80) :: abort_message
  REAL :: total_area_phy, total_area_dyn


  ! global array, on full physics grid:
  REAL,ALLOCATABLE :: latfi(:)
  REAL,ALLOCATABLE :: lonfi(:)
  REAL,ALLOCATABLE :: cufi(:)
  REAL,ALLOCATABLE :: cvfi(:)
  REAL,ALLOCATABLE :: airefi(:)
 
  IF (nlayer.NE.klev) THEN
    WRITE(lunout,*) 'STOP in ',trim(modname)
    WRITE(lunout,*) 'Problem with dimensions :'
    WRITE(lunout,*) 'nlayer     = ',nlayer
    WRITE(lunout,*) 'klev   = ',klev
    abort_message = ''
    CALL abort_gcm (modname,abort_message,1)
  ENDIF


  ! Generate global arrays on full physics grid
  ALLOCATE(latfi(klon_glo),lonfi(klon_glo),cufi(klon_glo),cvfi(klon_glo))
  ALLOCATE(airefi(klon_glo))

  IF (klon_glo>1) THEN ! general case
    ! North pole
    latfi(1)=rlatu(1)
    lonfi(1)=0.
    cufi(1) = cu(1)
    cvfi(1) = cv(1)
    DO j=2,jjm
      DO i=1,iim
        latfi((j-2)*iim+1+i)= rlatu(j)
        lonfi((j-2)*iim+1+i)= rlonv(i)
        cufi((j-2)*iim+1+i) = cu((j-1)*iim+1+i)
        cvfi((j-2)*iim+1+i) = cv((j-1)*iim+1+i)
      ENDDO
    ENDDO
    ! South pole
    latfi(klon_glo)= rlatu(jjm+1)
    lonfi(klon_glo)= 0.
    cufi(klon_glo) = cu((iim+1)*jjm+1)
    cvfi(klon_glo) = cv((iim+1)*jjm-iim)

    ! build airefi(), mesh area on physics grid
    CALL gr_dyn_fi(1,iim+1,jjm+1,klon_glo,aire,airefi)
    ! Poles are single points on physics grid
    airefi(1)=sum(aire(1:iim,1))
    airefi(klon_glo)=sum(aire(1:iim,jjm+1))

    ! Sanity check: do total planet area match between physics and dynamics?
    total_area_dyn=sum(aire(1:iim,1:jjm+1))
    total_area_phy=sum(airefi(1:klon_glo))
    IF (total_area_dyn/=total_area_phy) THEN
      WRITE (lunout, *) 'iniphysiq: planet total surface discrepancy !!!'
      WRITE (lunout, *) '     in the dynamics total_area_dyn=', total_area_dyn
      WRITE (lunout, *) '  but in the physics total_area_phy=', total_area_phy
      IF (abs(total_area_dyn-total_area_phy)>0.00001*total_area_dyn) THEN
        ! stop here if the relative difference is more than 0.001%
        abort_message = 'planet total surface discrepancy'
        CALL abort_gcm(modname, abort_message, 1)
      ENDIF
    ENDIF
  ELSE ! klon_glo==1, running the 1D model
    ! just copy over input values
    latfi(1)=rlatu(1)
    lonfi(1)=rlonv(1)
    cufi(1)=cu(1)
    cvfi(1)=cv(1)
    airefi(1)=aire(1,1)
  ENDIF ! of IF (klon_glo>1)

!$OMP PARALLEL
  ! Now generate local lon/lat/cu/cv/area arrays
  CALL initcomgeomphy
      
  offset = klon_mpi_begin - 1
  airephy(1:klon_omp) = airefi(offset+klon_omp_begin:offset+klon_omp_end)
  cuphy(1:klon_omp) = cufi(offset+klon_omp_begin:offset+klon_omp_end)
  cvphy(1:klon_omp) = cvfi(offset+klon_omp_begin:offset+klon_omp_end)
  rlond(1:klon_omp) = lonfi(offset+klon_omp_begin:offset+klon_omp_end)
  rlatd(1:klon_omp) = latfi(offset+klon_omp_begin:offset+klon_omp_end)

! copy some fundamental parameters to physics
  rradius=prad
  rg=pg
  rr=pr
  rcpp=pcpp

!$OMP END PARALLEL

!      print*,'ATTENTION !!! TRAVAILLER SUR INIPHYSIQ'
!      print*,'CONTROLE DES LATITUDES, LONGITUDES, PARAMETRES ...'

! Additional initializations for aquaplanets 
!$OMP PARALLEL
      if (iflag_phys>=100) then
        call iniaqua(klon_omp,rlatd,rlond,iflag_phys)
      endif
!$OMP END PARALLEL

      END