!$Id: adjh2o.F90 123 2009-03-27 10:38:52Z acosce $
!! =========================================================================
!! INCA - INteraction with Chemistry and Aerosols
!! 
!! Copyright Laboratoire des Sciences du Climat et de l'Environnement (LSCE)
!! 	     Unite mixte CEA-CNRS-UVSQ
!! 
!! Contributors to this INCA subroutine:
!! 
!! Stacy Walters, NCAR, stacy@ucar.edu 
!! Didier Hauglustaine, LSCE, didier.hauglustaine@lsce.ipsl.fr
!! 
!! Anne Cozic, LSCE, anne.cozic@cea.fr
!! Yann Meurdesoif, LSCE, yann.meurdesoif@cea.fr
!! 
!! This software is a computer program whose purpose is to simulate the 
!! atmospheric gas phase and aerosol composition. The model is designed to be
!! used within a transport model or a general circulation model. This version 
!! of INCA was designed to be coupled to the LMDz GCM. LMDz-INCA accounts
!! for emissions, transport (resolved and sub-grid scale), photochemical 
!! transformations, and scavenging (dry deposition and washout) of chemical 
!! species and aerosols interactively in the GCM. Several versions of the INCA
!! model are currently used depending on the envisaged applications with the 
!! chemistry-climate model. 
!! 
!! This software is governed by the CeCILL  license under French law and
!! abiding by the rules of distribution of free software.  You can  use, 
!! modify and/ or redistribute the software under the terms of the CeCILL
!! license as circulated by CEA, CNRS and INRIA at the following URL
!! "http://www.cecill.info". 
!! 
!! As a counterpart to the access to the source code and  rights to copy,
!! modify and redistribute granted by the license, users are provided only
!! with a limited warranty  and the software's author,  the holder of the
!! economic rights,  and the successive licensors  have only  limited
!! liability. 
!! 
!! In this respect, the user's attention is drawn to the risks associated
!! with loading,  using,  modifying and/or developing or reproducing the
!! software by the user in light of its specific status of free software,
!! that may mean  that it is complicated to manipulate,  and  that  also
!! therefore means  that it is reserved for developers  and  experienced
!! professionals having in-depth computer knowledge. Users are therefore
!! encouraged to load and test the software's suitability as regards their
!! requirements in conditions enabling the security of their systems and/or 
!! data to be ensured and,  more generally, to use and operate it in the 
!! same conditions as regards security. 
!! 
!! The fact that you are presently reading this means that you have had
!! knowledge of the CeCILL license and that you accept its terms.
!! =========================================================================

#include <inca_define.h>
SUBROUTINE ADJH2O(h2o, sh, ql, h2oc, mbar, vmr)  
!-----------------------------------------------------------------------
  !     ... Adjust the water vapor field in the stratosphere
  !         Note: the formula is 6ppm - 2*ch4
  !   	  Transform water vapor to volumetric m.r.
  !
  !	  Note: this routine is the multitasked version
  !	  Note: this routine assumes that ch4 is in the
  !               array vmr
  ! Stacy Walters, NCAR, 1998.
  ! Didier Hauglustaine, LSCE. 
  !-----------------------------------------------------------------------

  USE SPECIES_NAMES
  USE AIRPLANE_SRC, ONLY : itrop
  USE CHEM_MODS, ONLY : adv_mass
  USE INCA_DIM

  IMPLICIT NONE

  !-----------------------------------------------------------------------
  !	... Dummy arguments
  !-----------------------------------------------------------------------
  REAL, INTENT(inout)     ::   vmr(PLON,PLEV,PCNST)   ! xported species vmr
  REAL, INTENT(in)     ::   sh(PLON,PLEV)          ! specific humidity ( mmr )
  REAL, INTENT(in)     ::   ql(PLON,PLEV)          ! eau liquide
  REAL, INTENT(in)     ::   mbar(PLON,PLEV)        ! atmos mean mass
  REAL, INTENT(out)    ::   h2o(PLON,PLEV)         ! water vapor vmr
  REAL, INTENT(inout)  ::   h2oc(PLON,PLEV)        ! condensed phase water vmr

  !-----------------------------------------------------------------------
  !	... Local variables
  !-----------------------------------------------------------------------
  INTEGER ::   i, j, k, ktrop
  REAL    ::   t_value(PLON) 
  
  REAL, PARAMETER :: mh2o = 1. /18.01528

#ifdef STRAT
  DO i = 1, PLON
    ktrop=itrop(i)
    vmr(i,1:ktrop,id_H2O) = mbar(i,1:ktrop) * sh(i,1:ktrop) / adv_mass(id_H2O)
    h2oc(i,1:ktrop)       = mbar(i,1:ktrop) * ql(i,1:ktrop) / adv_mass(id_H2O)
  END DO

  h2o(:,:) = vmr(:,:,id_H2O) + h2oc(:,:)

#else
  h2o(:,:) = mbar(:,:) * sh(:PLON,:) * mh2o 

#ifdef NMHC
  DO k = 1,PLEV
    t_value(:) = 6.e-6 - 2. * vmr(:,k,id_ch4) - vmr(:,k,id_h2)
    WHERE( t_value(:) > h2o(:,k) )
        h2o(:,k) = t_value(:)
    endwhere
  END DO
#endif
#endif

END SUBROUTINE ADJH2O