MODULE impact_of_latent_heat_mod

!--------------------------------------------------------------------------------!
! This file is part of PALM.
!
! PALM is free software: you can redistribute it and/or modify it under the terms
! of the GNU General Public License as published by the Free Software Foundation,
! either version 3 of the License, or (at your option) any later version.
!
! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
! A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
!
! You should have received a copy of the GNU General Public License along with
! PALM. If not, see <http://www.gnu.org/licenses/>.
!
! Copyright 1997-2012  Leibniz University Hannover
!--------------------------------------------------------------------------------!
!
! Current revisions:
! -----------------
! 
!
! Former revisions:
! -----------------
! $Id: impact_of_latent_heat.f90 1037 2012-10-22 14:10:22Z witha $
!
! 1036 2012-10-22 13:43:42Z raasch
! code put under GPL (PALM 3.9)
!
! 72 2007-03-19 08:20:46Z
! precipitation_rate renamed dqdt_precip
!
! 19 2007-02-23 04:53:48Z raasch
! Calculation extended for gridpoint nzt
! 
! RCS Log replace by Id keyword, revision history cleaned up
!
! Revision 1.5  2004/01/30 10:25:59  raasch
! Scalar lower k index nzb replaced by 2d-array nzb_2d
!
! Revision 1.1  2000/04/13 14:48:40  schroeter
! Initial revision
!
!
! Description:
! ------------
! Calculate the impact of latent heat due to precipitation
! (simplified Kessler scheme)
!------------------------------------------------------------------------------!

    PRIVATE
    PUBLIC impact_of_latent_heat

    INTERFACE impact_of_latent_heat
       MODULE PROCEDURE impact_of_latent_heat
       MODULE PROCEDURE impact_of_latent_heat_ij
    END INTERFACE impact_of_latent_heat
 
 CONTAINS


!------------------------------------------------------------------------------!
! Call for all grid points
!------------------------------------------------------------------------------!
    SUBROUTINE impact_of_latent_heat

       USE arrays_3d
       USE cloud_parameters
       USE constants
       USE indices

       IMPLICIT NONE

       INTEGER ::  i, j, k
       REAL    ::  dqdt_precip

 
       DO  i = nxl, nxr
          DO  j = nys, nyn
             DO  k = nzb_2d(j,i)+1, nzt

                IF ( ql(k,j,i) > ql_crit )  THEN
                   dqdt_precip = prec_time_const * ( ql(k,j,i) - ql_crit )
                ELSE
                   dqdt_precip = 0.0
                ENDIF
                tend(k,j,i) = tend(k,j,i) + dqdt_precip * l_d_cp * pt_d_t(k)

             ENDDO
          ENDDO
       ENDDO

    END SUBROUTINE impact_of_latent_heat


!------------------------------------------------------------------------------!
! Call for grid point i,j
!------------------------------------------------------------------------------!
    SUBROUTINE impact_of_latent_heat_ij( i, j )

       USE arrays_3d
       USE cloud_parameters
       USE constants
       USE indices
   
       IMPLICIT NONE

       INTEGER ::  i, j, k
       REAL    ::  dqdt_precip


       DO  k = nzb_2d(j,i)+1, nzt

          IF ( ql(k,j,i) > ql_crit )  THEN
             dqdt_precip = prec_time_const * ( ql(k,j,i) - ql_crit )
          ELSE
             dqdt_precip = 0.0
          ENDIF
          tend(k,j,i) = tend(k,j,i) + dqdt_precip * l_d_cp * pt_d_t(k)

       ENDDO

    END SUBROUTINE impact_of_latent_heat_ij

 END MODULE impact_of_latent_heat_mod