!
! $Id: caldyn.f90 5285 2024-10-28 13:33:29Z jyg $
!
SUBROUTINE caldyn &
        (itau,ucov,vcov,teta,ps,masse,pk,pkf,phis , &
        phi,conser,du,dv,dteta,dp,w,pbaru,pbarv,time )


  USE comgeom_mod_h
  USE comvert_mod, ONLY: ap, bp

  USE dimensions_mod, ONLY: iim, jjm, llm, ndm
USE paramet_mod_h
IMPLICIT NONE

  !=======================================================================
  !
  !  Auteur :  P. Le Van
  !
  !   Objet:
  !   ------
  !
  !   Calcul des tendances dynamiques.
  !
  ! Modif 04/93 F.Forget
  !=======================================================================

  !-----------------------------------------------------------------------
  !   0. Declarations:
  !   ----------------




  !   Arguments:
  !   ----------

  LOGICAL,INTENT(IN) :: conser ! triggers printing some diagnostics
  INTEGER,INTENT(IN) :: itau ! time step index
  REAL,INTENT(IN) :: vcov(ip1jm,llm) ! covariant meridional wind
  REAL,INTENT(IN) :: ucov(ip1jmp1,llm) ! covariant zonal wind
  REAL,INTENT(IN) :: teta(ip1jmp1,llm) ! potential temperature
  REAL,INTENT(IN) :: ps(ip1jmp1) ! surface pressure
  REAL,INTENT(IN) :: phis(ip1jmp1) ! geopotential at the surface
  REAL,INTENT(IN) :: pk(ip1jmp1,llm) ! Exner at mid-layer
  REAL,INTENT(IN) :: pkf(ip1jmp1,llm) ! filtered Exner
  REAL,INTENT(IN) :: phi(ip1jmp1,llm) ! geopotential
  REAL,INTENT(OUT) :: masse(ip1jmp1,llm) ! air mass
  REAL,INTENT(OUT) :: dv(ip1jm,llm) ! tendency on vcov
  REAL,INTENT(OUT) :: du(ip1jmp1,llm) ! tendency on ucov
  REAL,INTENT(OUT) :: dteta(ip1jmp1,llm) ! tenddency on teta
  REAL,INTENT(OUT) :: dp(ip1jmp1) ! tendency on ps
  REAL,INTENT(OUT) :: w(ip1jmp1,llm) ! vertical velocity
  REAL,INTENT(OUT) :: pbaru(ip1jmp1,llm) ! mass flux in the zonal direction
  REAL,INTENT(OUT) :: pbarv(ip1jm,llm) ! mass flux in the meridional direction
  REAL,INTENT(IN) :: time ! current time

  !   Local:
  !   ------

  REAL :: vcont(ip1jm,llm),ucont(ip1jmp1,llm)
  REAL :: ang(ip1jmp1,llm),p(ip1jmp1,llmp1)
  REAL :: massebx(ip1jmp1,llm),masseby(ip1jm,llm),psexbarxy(ip1jm)
  REAL :: vorpot(ip1jm,llm)
  REAL :: ecin(ip1jmp1,llm),convm(ip1jmp1,llm)
  REAL :: bern(ip1jmp1,llm)
  REAL :: massebxy(ip1jm,llm)


  INTEGER :: ij,l

  !-----------------------------------------------------------------------
  !   Compute dynamical tendencies:
  !--------------------------------

  ! ! compute contravariant winds ucont() and vcont
  CALL covcont  ( llm    , ucov    , vcov , ucont, vcont        )
  ! ! compute pressure p()
  CALL pression ( ip1jmp1, ap      , bp   ,  ps  , p            )
  ! ! compute psexbarxy() XY-area weighted-averaged surface pressure (what for?)
  CALL psextbar (   ps   , psexbarxy                            )
  ! ! compute mass in each atmospheric mesh: masse()
  CALL massdair (    p   , masse                                )
  ! ! compute X and Y-averages of mass, massebx() and masseby()
  CALL massbar  (   masse, massebx , masseby                    )
  ! ! compute XY-average of mass, massebxy()
  call massbarxy(   masse, massebxy                             )
  ! ! compute mass fluxes pbaru() and pbarv()
  CALL flumass  ( massebx, masseby , vcont, ucont ,pbaru, pbarv )
  ! ! compute dteta() , horizontal converging flux of theta
  CALL dteta1   (   teta , pbaru   , pbarv, dteta               )
  ! ! compute convm(), horizontal converging flux of mass
  CALL convmas  (   pbaru, pbarv   , convm                      )

  ! ! compute pressure variation due to mass convergence
  DO ij =1, ip1jmp1
     dp( ij ) = convm( ij,1 ) / airesurg( ij )
  ENDDO

  ! ! compute vertical velocity w()
  CALL vitvert ( convm  , w                                  )
  ! ! compute potential vorticity vorpot()
  CALL tourpot ( vcov   , ucov  , massebxy  , vorpot         )
  ! ! compute rotation induced du() and dv()
  CALL dudv1   ( vorpot , pbaru , pbarv     , du     , dv    )
  ! ! compute kinetic energy ecin()
  CALL enercin ( vcov   , ucov  , vcont     , ucont  , ecin  )
  ! ! compute Bernouilli function bern()
  CALL bernoui ( ip1jmp1, llm   , phi       , ecin   , bern  )
  ! ! compute and add du() and dv() contributions from Bernouilli and pressure
  CALL dudv2   ( teta   , pkf   , bern      , du     , dv    )


  DO l=1,llm
     DO ij=1,ip1jmp1
        ang(ij,l) = ucov(ij,l) + constang(ij)
     ENDDO
  ENDDO

  ! ! compute vertical advection contributions to du(), dv() and dteta()
  CALL advect( ang, vcov, teta, w, massebx, masseby, du, dv,dteta )

  !  WARNING probleme de peridocite de dv sur les PC/linux. Pb d'arrondi
       ! probablement. Observe sur le code compile avec pgf90 3.0-1

  DO l = 1, llm
     DO ij = 1, ip1jm, iip1
       IF( dv(ij,l).NE.dv(ij+iim,l) )  THEN
      ! PRINT *,'!!!ATTENTION!!! probleme de periodicite sur vcov',
  !    ,   ' dans caldyn'
      ! PRINT *,' l,  ij = ', l, ij, ij+iim,dv(ij+iim,l),dv(ij,l)
      dv(ij+iim,l) = dv(ij,l)
       ENDIF
     ENDDO
  ENDDO

  !-----------------------------------------------------------------------
  !   Output some control variables:
  !---------------------------------

  IF( conser )  THEN
    CALL sortvarc &
          ( itau,ucov,teta,ps,masse,pk,phis,vorpot,phi,bern,dp,time,vcov )
  ENDIF

END SUBROUTINE caldyn