! $Id: iniphysiq.F90 2273 2015-05-13 10:35:29Z jyg $


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 phyaqua_mod, ONLY: iniaqua
  IMPLICIT NONE

  ! =======================================================================
  ! Initialisation of the physical constants and some positional and
  ! geometrical arrays for the physics
  ! =======================================================================

  include "YOMCST.h"
  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 columns 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/=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)
  END IF

  !call init_phys_lmdz(iim,jjm+1,llm,1,(/(jjm-1)*iim+2/))
  
  ! 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)

    ! suphel => initialize some physical constants (orbital parameters,
    !           geoid, gravity, thermodynamical constants, etc.) in the
    !           physics
  CALL suphel

!$OMP END PARALLEL

  ! check that physical constants set in 'suphel' are coherent
  ! with values set in the dynamics:
  IF (rday/=punjours) THEN
    WRITE (lunout, *) 'iniphysiq: length of day discrepancy!!!'
    WRITE (lunout, *) '  in the dynamics punjours=', punjours
    WRITE (lunout, *) '   but in the physics RDAY=', rday
    IF (abs(rday-punjours)>0.01*punjours) THEN
        ! stop here if the relative difference is more than 1%
      abort_message = 'length of day discrepancy'
      CALL abort_gcm(modname, abort_message, 1)
    END IF
  END IF
  IF (rg/=pg) THEN
    WRITE (lunout, *) 'iniphysiq: gravity discrepancy !!!'
    WRITE (lunout, *) '     in the dynamics pg=', pg
    WRITE (lunout, *) '  but in the physics RG=', rg
    IF (abs(rg-pg)>0.01*pg) THEN
        ! stop here if the relative difference is more than 1%
      abort_message = 'gravity discrepancy'
      CALL abort_gcm(modname, abort_message, 1)
    END IF
  END IF
  IF (ra/=prad) THEN
    WRITE (lunout, *) 'iniphysiq: planet radius discrepancy !!!'
    WRITE (lunout, *) '   in the dynamics prad=', prad
    WRITE (lunout, *) '  but in the physics RA=', ra
    IF (abs(ra-prad)>0.01*prad) THEN
        ! stop here if the relative difference is more than 1%
      abort_message = 'planet radius discrepancy'
      CALL abort_gcm(modname, abort_message, 1)
    END IF
  END IF
  IF (rd/=pr) THEN
    WRITE (lunout, *) 'iniphysiq: reduced gas constant discrepancy !!!'
    WRITE (lunout, *) '     in the dynamics pr=', pr
    WRITE (lunout, *) '  but in the physics RD=', rd
    IF (abs(rd-pr)>0.01*pr) THEN
        ! stop here if the relative difference is more than 1%
      abort_message = 'reduced gas constant discrepancy'
      CALL abort_gcm(modname, abort_message, 1)
    END IF
  END IF
  IF (rcpd/=pcpp) THEN
    WRITE (lunout, *) 'iniphysiq: specific heat discrepancy !!!'
    WRITE (lunout, *) '     in the dynamics pcpp=', pcpp
    WRITE (lunout, *) '  but in the physics RCPD=', rcpd
    IF (abs(rcpd-pcpp)>0.01*pcpp) THEN
        ! stop here if the relative difference is more than 1%
      abort_message = 'specific heat discrepancy'
      CALL abort_gcm(modname, abort_message, 1)
    END IF
  END IF

  ! Additional initializations for aquaplanets
!$OMP PARALLEL
  IF (iflag_phys>=100) THEN
    CALL iniaqua(klon_omp, rlatd, rlond, iflag_phys)
  END IF
!$OMP END PARALLEL

END SUBROUTINE iniphysiq