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!MNH_LIC Copyright 1994-2020 CNRS, Meteo-France and Universite Paul Sabatier
!MNH_LIC This is part of the Meso-NH software governed by the CeCILL-C licence
!MNH_LIC version 1. See LICENSE, CeCILL-C_V1-en.txt and CeCILL-C_V1-fr.txt
!MNH_LIC for details. version 1.
!-----------------------------------------------------------------
! ######################
MODULE MODI_GRADIENT_W
! ######################
!
INTERFACE
!
!
FUNCTION GZ_W_M(PA,PDZZ, KKA, KKU, KL) RESULT(PGZ_W_M)

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!
INTEGER, INTENT(IN),OPTIONAL :: KKA, KKU ! near ground and uppest atmosphere array indexes
INTEGER, INTENT(IN),OPTIONAL :: KL ! +1 if grid goes from ground to atmosphere top, -1 otherwise

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REAL, DIMENSION(:,:,:), INTENT(IN) :: PA ! variable at the W point
REAL, DIMENSION(:,:,:), INTENT(IN) :: PDZZ ! metric coefficient dzz
!
REAL, DIMENSION(SIZE(PA,1),SIZE(PA,2),SIZE(PA,3)) :: PGZ_W_M ! result mass point
!
END FUNCTION GZ_W_M
!
FUNCTION GX_W_UW(PA,PDXX,PDZZ,PDZX, KKA, KKU, KL) RESULT(PGX_W_UW)

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!
INTEGER, INTENT(IN),OPTIONAL :: KKA, KKU ! near ground and uppest atmosphere array indexes
INTEGER, INTENT(IN),OPTIONAL :: KL ! +1 if grid goes from ground to atmosphere top, -1 otherwise

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REAL, DIMENSION(:,:,:), INTENT(IN) :: PA ! variable at the W point
REAL, DIMENSION(:,:,:), INTENT(IN) :: PDXX ! metric coefficient dxx
REAL, DIMENSION(:,:,:), INTENT(IN) :: PDZZ ! metric coefficient dzz
REAL, DIMENSION(:,:,:), INTENT(IN) :: PDZX ! metric coefficient dzx
!
REAL, DIMENSION(SIZE(PA,1),SIZE(PA,2),SIZE(PA,3)) :: PGX_W_UW ! result UW point
!
END FUNCTION GX_W_UW
!
!
FUNCTION GY_W_VW(PA,PDYY,PDZZ,PDZY, KKA, KKU, KL) RESULT(PGY_W_VW)

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!
INTEGER, INTENT(IN),OPTIONAL :: KKA, KKU ! near ground and uppest atmosphere array indexes
INTEGER, INTENT(IN),OPTIONAL :: KL ! +1 if grid goes from ground to atmosphere top, -1 otherwise

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REAL, DIMENSION(:,:,:), INTENT(IN) :: PA ! variable at the W point
REAL, DIMENSION(:,:,:), INTENT(IN) :: PDYY ! metric coefficient dyy
REAL, DIMENSION(:,:,:), INTENT(IN) :: PDZZ ! metric coefficient dzz
REAL, DIMENSION(:,:,:), INTENT(IN) :: PDZY ! metric coefficient dzy
!
REAL, DIMENSION(SIZE(PA,1),SIZE(PA,2),SIZE(PA,3)) :: PGY_W_VW ! result VW point
!
END FUNCTION GY_W_VW
!
!
END INTERFACE
!
END MODULE MODI_GRADIENT_W
!
!
!
! #######################################################
FUNCTION GZ_W_M(PA,PDZZ, KKA, KKU, KL) RESULT(PGZ_W_M)

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! #######################################################
!
!!**** *GZ_W_M* - Cartesian Gradient operator:
!! computes the gradient in the cartesian Z
!! direction for a variable placed at the
!! W point and the result is placed at
!! the mass point.
!! PURPOSE
!! -------
! The purpose of this function is to compute the discrete gradient
! along the Z cartesian direction for a field PA placed at the
! W point. The result is placed at the mass point.
!
!!** METHOD
!! ------
!! The Chain rule of differencing is applied to variables expressed
!! in the Gal-Chen & Somerville coordinates to obtain the gradient in
!! the cartesian system
!!
!! EXTERNAL
!! --------
!! MZF : Shuman functions (mean operators)
!! DZF : Shuman functions (finite difference operators)
!!
!! IMPLICIT ARGUMENTS
!! ------------------
!! NONE
!!
!! REFERENCE
!! ---------
!! Book2 of documentation of Meso-NH (GRAD_CAR operators)
!! A Turbulence scheme for the Meso-NH model (Chapter 6)
!!
!! AUTHOR
!! ------
!! Joan Cuxart *INM and Meteo-France*
!!
!! MODIFICATIONS
!! -------------
!! Original 19/07/94
!-------------------------------------------------------------------------
!
!* 0. DECLARATIONS
!
!
USE MODI_SHUMAN
!
IMPLICIT NONE
!
!
!* 0.1 declarations of arguments and result
!
INTEGER, INTENT(IN),OPTIONAL :: KKA, KKU ! near ground and uppest atmosphere array indexes
INTEGER, INTENT(IN),OPTIONAL :: KL ! +1 if grid goes from ground to atmosphere top, -1 otherwise

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REAL, DIMENSION(:,:,:), INTENT(IN) :: PA ! variable at the W point
REAL, DIMENSION(:,:,:), INTENT(IN) :: PDZZ ! metric coefficient dzz
!
REAL, DIMENSION(SIZE(PA,1),SIZE(PA,2),SIZE(PA,3)) :: PGZ_W_M ! result mass point
!
!
!* 0.2 declaration of local variables
!
! NONE
!
!----------------------------------------------------------------------------
!
!* 1. DEFINITION of GZ_W_M
! --------------------
!
PGZ_W_M(:,:,:)= DZF(PA(:,:,:))/(MZF(PDZZ(:,:,:)))
!
!----------------------------------------------------------------------------
!
END FUNCTION GZ_W_M
!
!
! #########################################################
FUNCTION GX_W_UW(PA,PDXX,PDZZ,PDZX, KKA, KKU, KL) RESULT(PGX_W_UW)

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! #########################################################
!
!!**** *GX_W_UW* - Cartesian Gradient operator:
!! computes the gradient in the cartesian X
!! direction for a variable placed at the
!! V point and the result is placed at
!! the UW vorticity point.
!! PURPOSE
!! -------
! The purpose of this function is to compute the discrete gradient
! along the X cartesian direction for a field PA placed at the
! W point. The result is placed at the UW vorticity point.
!
!!** METHOD
!! ------
!! The Chain rule of differencing is applied to variables expressed
!! in the Gal-Chen & Somerville coordinates to obtain the gradient in
!! the cartesian system
!!
!! EXTERNAL
!! --------
!! MXM,MZM,MZF : Shuman functions (mean operators)
!! DXM,DZM : Shuman functions (finite difference operators)
!!
!! IMPLICIT ARGUMENTS
!! ------------------
!! NONE
!!
!! REFERENCE
!! ---------
!! Book2 of documentation of Meso-NH (GRAD_CAR operators)
!! A Turbulence scheme for the Meso-NH model (Chapter 6)
!!
!! AUTHOR
!! ------
!! Joan Cuxart *INM and Meteo-France*
!!
!! MODIFICATIONS
!! -------------
!! Original 20/07/94
!! 18/10/00 (V.Masson) add LFLAT switch
!-------------------------------------------------------------------------
!
!* 0. DECLARATIONS
!
!
USE MODI_SHUMAN
USE MODD_CONF
!
IMPLICIT NONE
!
!
!* 0.1 declarations of arguments and result
!
INTEGER, INTENT(IN),OPTIONAL :: KKA, KKU ! near ground and uppest atmosphere array indexes
INTEGER, INTENT(IN),OPTIONAL :: KL ! +1 if grid goes from ground to atmosphere top, -1 otherwise

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REAL, DIMENSION(:,:,:), INTENT(IN) :: PA ! variable at the W point
REAL, DIMENSION(:,:,:), INTENT(IN) :: PDXX ! metric coefficient dxx
REAL, DIMENSION(:,:,:), INTENT(IN) :: PDZZ ! metric coefficient dzz
REAL, DIMENSION(:,:,:), INTENT(IN) :: PDZX ! metric coefficient dzx
!
REAL, DIMENSION(SIZE(PA,1),SIZE(PA,2),SIZE(PA,3)) :: PGX_W_UW ! result UW point
!
!
!* 0.2 declaration of local variables
!
! NONE
!
!----------------------------------------------------------------------------
!
!* 1. DEFINITION of GX_W_UW
! ---------------------
!
IF (.NOT. LFLAT) THEN
PGX_W_UW(:,:,:)= DXM(PA(:,:,:))/(MZM(PDXX(:,:,:))) &
-DZM(MXM(MZF(PA(:,:,:))))*PDZX(:,:,:) &
/( MZM(PDXX(:,:,:))*MXM(PDZZ(:,:,:)) )
ELSE
PGX_W_UW(:,:,:)= DXM(PA(:,:,:))/(MZM(PDXX(:,:,:)))
END IF
!
!----------------------------------------------------------------------------
!
END FUNCTION GX_W_UW
!
!
! #########################################################
FUNCTION GY_W_VW(PA,PDYY,PDZZ,PDZY, KKA, KKU, KL) RESULT(PGY_W_VW)

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! #########################################################
!
!!**** *GY_W_VW* - Cartesian Gradient operator:
!! computes the gradient in the cartesian Y
!! direction for a variable placed at the
!! W point and the result is placed at
!! the VW vorticity point.
!! PURPOSE
!! -------
! The purpose of this function is to compute the discrete gradient
! along the Y cartesian direction for a field PA placed at the
! W point. The result is placed at the VW vorticity point.
!
!!** METHOD
!! ------
!! The Chain rule of differencing is applied to variables expressed
!! in the Gal-Chen & Somerville coordinates to obtain the gradient in
!! the cartesian system
!!
!! EXTERNAL
!! --------
!! MYM,MZM,MZF : Shuman functions (mean operators)
!! DYM,DZM : Shuman functions (finite difference operators)
!!
!! IMPLICIT ARGUMENTS
!! ------------------
!! NONE
!!
!! REFERENCE
!! ---------
!! Book2 of documentation of Meso-NH (GRAD_CAR operators)
!! A Turbulence scheme for the Meso-NH model (Chapter 6)
!!
!! AUTHOR
!! ------
!! Joan Cuxart *INM and Meteo-France*
!!
!! MODIFICATIONS
!! -------------
!! Original 20/07/94
!! 18/10/00 (V.Masson) add LFLAT switch
!-------------------------------------------------------------------------
!
!* 0. DECLARATIONS
!
!
USE MODI_SHUMAN
USE MODD_CONF
!
IMPLICIT NONE
!
!
!* 0.1 declarations of arguments and result
!
INTEGER, INTENT(IN),OPTIONAL :: KKA, KKU ! near ground and uppest atmosphere array indexes
INTEGER, INTENT(IN),OPTIONAL :: KL ! +1 if grid goes from ground to atmosphere top, -1 otherwise

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REAL, DIMENSION(:,:,:), INTENT(IN) :: PA ! variable at the W point
REAL, DIMENSION(:,:,:), INTENT(IN) :: PDYY ! metric coefficient dxx
REAL, DIMENSION(:,:,:), INTENT(IN) :: PDZZ ! metric coefficient dzz
REAL, DIMENSION(:,:,:), INTENT(IN) :: PDZY ! metric coefficient dzx
!
REAL, DIMENSION(SIZE(PA,1),SIZE(PA,2),SIZE(PA,3)) :: PGY_W_VW ! result VW point
!
!
!* 0.2 declaration of local variables
!
! NONE
!
!----------------------------------------------------------------------------
!
!* 1. DEFINITION of GY_W_VW
! ---------------------
!
IF (.NOT. LFLAT) THEN
PGY_W_VW(:,:,:)= DYM(PA(:,:,:))/(MZM(PDYY(:,:,:))) &
-DZM(MYM(MZF(PA(:,:,:))))*PDZY(:,:,:) &
/( MZM(PDYY(:,:,:))*MYM(PDZZ(:,:,:)) )
ELSE
PGY_W_VW(:,:,:)= DYM(PA(:,:,:))/(MZM(PDYY(:,:,:)))
END IF
!
!----------------------------------------------------------------------------
!
END FUNCTION GY_W_VW