!> @file impact_of_latent_heat.f90
!--------------------------------------------------------------------------------!
! 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 1997-2014 Leibniz Universitaet Hannover
!--------------------------------------------------------------------------------!
!
! Current revisions:
! -----------------
! 
! 
! Former revisions:
! -----------------
! $Id: impact_of_latent_heat.f90 1683 2015-10-07 23:57:51Z knoop $
!
! 1682 2015-10-07 23:56:08Z knoop
! Code annotations made doxygen readable 
! 
! 1353 2014-04-08 15:21:23Z heinze
! REAL constants provided with KIND-attribute 
!
! 1320 2014-03-20 08:40:49Z raasch
! ONLY-attribute added to USE-statements,
! kind-parameters added to all INTEGER and REAL declaration statements, 
! kinds are defined in new module kinds, 
! revision history before 2012 removed,
! comment fields (!:) to be used for variable explanations added to
! all variable declaration statements 
! 
! 1036 2012-10-22 13:43:42Z raasch
! code put under GPL (PALM 3.9)
!
! 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)
!------------------------------------------------------------------------------!
 MODULE impact_of_latent_heat_mod
 

    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


!------------------------------------------------------------------------------!
! Description:
! ------------
!> Call for all grid points
!------------------------------------------------------------------------------!
    SUBROUTINE impact_of_latent_heat

       USE arrays_3d,                                                          &
           ONLY:  ql, tend
           
       USE cloud_parameters,                                                   &
           ONLY:  l_d_cp, prec_time_const, pt_d_t, ql_crit
           
       USE indices,                                                            &
           ONLY:  nxl, nxr, nyn, nys, nzb_2d, nzt
           
       USE kinds

       IMPLICIT NONE

       INTEGER(iwp) ::  i  !<
       INTEGER(iwp) ::  j  !<
       INTEGER(iwp) ::  k  !<
       
       REAL(wp) ::  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_wp
                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


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

       USE arrays_3d,                                                          &
           ONLY:  ql, tend
           
       USE cloud_parameters,                                                   &
           ONLY:  l_d_cp, prec_time_const, pt_d_t, ql_crit
           
       USE indices,                                                            &
           ONLY:  nzb_2d, nzt
           
       USE kinds                                                               
   
       IMPLICIT NONE

       INTEGER(iwp) ::  i  !<
       INTEGER(iwp) ::  j  !<
       INTEGER(iwp) ::  k  !<
       
       REAL(wp) ::  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_wp
          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