latlon_gridtype_lonlat_reg.F90

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!SFX_LIC Copyright 1994-2014 CNRS, Meteo-France and Universite Paul Sabatier
!SFX_LIC This is part of the SURFEX software governed by the CeCILL-C licence
!SFX_LIC version 1. See LICENSE, CeCILL-C_V1-en.txt and CeCILL-C_V1-fr.txt  
!SFX_LIC for details. version 1.
!     #########################################################################
      SUBROUTINE latlon_gridtype_lonlat_reg(KGRID_PAR,KL,PGRID_PAR,PLAT,PLON,PMESH_SIZE,PDIR)
!     #########################################################################
!
!!****  *LATLON_GRIDTYPE_LONLAT_REG* - routine to compute the horizontal geographic fields
!!
!!    PURPOSE
!!    -------
!!
!!**  METHOD
!!    ------
!!
!!    EXTERNAL
!!    --------
!!
!!
!!    IMPLICIT ARGUMENTS
!!    ------------------
!!
!!    REFERENCE
!!    ---------
!!
!!
!!    AUTHOR
!!    ------
!!      V. Masson   *Meteo France*
!!
!!    MODIFICATIONS
!!    -------------
!!      Original    01/2004 
!-------------------------------------------------------------------------------
!
!*       0.    DECLARATIONS
!              ------------
!
USE modd_csts,     ONLY : xpi, xradius
!
USE mode_gridtype_lonlat_reg
!
!
!
USE yomhook   ,ONLY : lhook,   dr_hook
USE parkind1  ,ONLY : jprb
!
IMPLICIT NONE
!
!*       0.1   Declarations of arguments
!              -------------------------
!
INTEGER,                    INTENT(IN)  :: kgrid_par  ! size of PGRID_PAR
INTEGER,                    INTENT(IN)  :: kl         ! number of points
REAL, DIMENSION(KGRID_PAR), INTENT(IN)  :: pgrid_par  ! parameters defining this grid
REAL, DIMENSION(KL),        INTENT(OUT) :: plat       ! latitude  (degrees)
REAL, DIMENSION(KL),        INTENT(OUT) :: plon       ! longitude (degrees)
REAL, DIMENSION(KL),        INTENT(OUT) :: pmesh_size ! mesh size (m2)
REAL, DIMENSION(KL),        INTENT(OUT) :: pdir ! direction of main grid Y axis (deg. from N, clockwise)
!
!*       0.2   Declarations of local variables
!              -------------------------------
!
REAL    :: zlonmin ! minimum longitude (degrees)
REAL    :: zlonmax ! maximum longitude (degrees)
REAL    :: zlatmin ! minimum latitude  (degrees)
REAL    :: zlatmax ! maximum latitude  (degrees)
INTEGER :: ilon    ! number of points in longitude
INTEGER :: ilat    ! number of points in latitude
!
REAL    :: zdlat   ! grid size in latitude  unit
REAL    :: zdlon   ! grid size in longitude unit
REAL(KIND=JPRB) :: zhook_handle
!---------------------------------------------------------------------------
!
!*       1.    Grid parameters
!              ---------------
!
IF (lhook) CALL dr_hook('LATLON_GRIDTYPE_LONLAT_REG',0,zhook_handle)
 CALL get_gridtype_lonlat_reg(pgrid_par,zlonmin,zlonmax,                    &
                               zlatmin,zlatmax,ilon,ilat,plon=plon,plat=plat )  
!
!-----------------------------------------------------------------------------
!
!*       2.    Compute grid size
!              -----------------
!
zdlat = (zlatmax-zlatmin)/float(ilat)
zdlon = (zlonmax-zlonmin)/float(ilon)
!
pmesh_size(:) = xradius**2 * xpi/180.*(zdlon)              &
       * (sin((plat(:)+zdlat/2.)*xpi/180.)-sin((plat(:)-zdlat/2.)*xpi/180.))  
!
!-----------------------------------------------------------------------------
!
!*       4.    Direction of of grid from North for each grid point
!              ---------------------------------------------------
!
pdir(:) = 0.
IF (lhook) CALL dr_hook('LATLON_GRIDTYPE_LONLAT_REG',1,zhook_handle)
!
!---------------------------------------------------------------------------
!
END SUBROUTINE latlon_gridtype_lonlat_reg