source: palm/trunk/SOURCE/chem_photolysis_mod.f90 @ 4180

!> @file chem_photolysis_mod.f90
!------------------------------------------------------------------------------!
! This file is part of the PALM model system.
!
! 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 2018-2018 Leibniz Universitaet Hannover
! Copyright 2018-2018 Karlsruhe Institute of Technology
!------------------------------------------------------------------------------!
!
! Current revisions:
! -----------------
! 
! 
! Former revisions:
! -----------------
! $Id: chem_photolysis_mod.f90 4180 2019-08-21 14:37:54Z scharf $
! some formatting and comments added 
! 
! 3824 2019-03-27 15:56:16Z pavelkrc
! unused variables removed
! 
!------------------------------------------------------------------------------!
! Description:
! ------------
!> photolysis models and interfaces (Adapted from photolysis_model_mod.f90)
!> @todo more complex scheme, add shading
!------------------------------------------------------------------------------!
 MODULE chem_photolysis_mod

!   USE arrays_3d,                                                             &
!       ONLY:  dzw, q, ql, zu, zw

    USE control_parameters,                                                    &
        ONLY:  time_since_reference_point

    USE pegrid,                                                                &
        ONLY: myid, threads_per_task

    USE indices,                                                               &
        ONLY:  nxl, nxlg, nxr, nxrg, nyn, nyng, nys, nysg, nzb, nzt

    USE control_parameters,                                                    &
        ONLY:  initializing_actions           

    USE chem_gasphase_mod,                                                     &
        ONLY: nphot, phot_names, phot 

    USE chem_modules,                                                          &
        ONLY: phot_frequen, photolysis_scheme

    USE chem_modules,                                                          &
        ONLY: chem_debug2

    USE kinds

#if defined ( __netcdf )
    USE NETCDF
#endif


    IMPLICIT NONE


!   LOGICAL ::  unscheduled_photolysis_calls = .TRUE., & !< flag parameter indicating whether additional calls of the photolysis code are allowed
!               constant_albedo = .FALSE.,           & !< flag parameter indicating whether the albedo may change depending on zenith
!               force_photolysis_call = .FALSE.,     & !< flag parameter for unscheduled photolysis calls
!               photolysis = .FALSE.,                & !< flag parameter indicating whether the photolysis model is used
!               sun_up    = .TRUE.,                  & !< flag parameter indicating whether the sun is up or down
!               photolysis = .TRUE.,                 & !< flag parameter indicing whether photolysis shall be calculated
!               sun_direction = .FALSE.                !< flag parameter indicing whether solar direction shall be calculated

!-- Parameters for constant photolysis frequencies
    INTEGER,PARAMETER :: nconst  = 15               !< available predefined photolysis prequencies for constant 

! Names for predefined fixed photolysis frequencies at zenith angle 0
    CHARACTER(LEN=10), PARAMETER, DIMENSION(nconst) :: names_c =  (/                     &
                     'J_O31D    ','J_O33P    ','J_NO2     ','J_HNO3    ','J_RCHO    ',   &
                     'J         ','J         ','J         ','J         ','J         ',   &
                     'J         ','J         ','J         ','J         ','J         ' /)
! Photolysis frequency at zenith angle 0 degrees in 1/s
    REAL(wp), PARAMETER, DIMENSION(nconst) :: phot0 =  (/                                &
                      2.489E-05_wp,3.556E-04_wp, 8.89E-03_wp,5.334E-07_wp,3.734E-05_wp,  &
                      0.0000E00_wp,0.0000E00_wp,0.0000E00_wp,0.0000E00_wp,0.0000E00_wp,  &
                      0.0000E00_wp,0.0000E00_wp,0.0000E00_wp,0.0000E00_wp,0.0000E00_wp /)

!-- Parameters for simple photolysis frequencies from MCM (http://mcm.leeds.ac.uk/MCM)
!-- Saunders et al., 2003, Atmos. Chem. Phys., 3, 161-180
   INTEGER,PARAMETER :: nsimple = 15               !< available predefined photolysis prequencies for simple parameterisation
! Names for simple photolysis frequencies parameterisation (
    CHARACTER(LEN=10), PARAMETER, DIMENSION(nsimple) :: names_s =  (/                    &
                     'J_O31D    ','J_O33P    ','J_H2O2    ','J_NO2     ','J_NO3_A   ',   &
                     'J_NO3_B   ','J_HONO    ','J_HNO3    ','J_HCHO_A  ','J_HCHO_B  ',   &
                     'J_CH3CHO  ','J         ','J         ','J         ','J_RCHO    ' /)

!-- Species dependent parameters for simple photolysis frequencies from MCM (http://mcm.leeds.ac.uk/MCM)
!-- J = l*COSx@m*EXP(-n*SECx)  with l,m,n named par_l etc., x is the zenith angle
   REAL(wp), PARAMETER, DIMENSION(nconst) :: par_l =  (/                                 &
                       6.073E-05_wp,4.775E-04_wp,1.041E-05_wp,1.165E-02_wp,2.485E-02_wp, &
                       1.747E-01_wp,2.644E-03_wp,9.312E-07_wp,4.642E-05_wp,6.853E-05_wp, &
                       7.344E-06_wp,0.0000E00_wp,0.0000E00_wp,0.000E00_wp, 6.853E-05_wp /)

   REAL(wp), PARAMETER, DIMENSION(nconst) :: par_m =  (/                                 &
                           1.743_wp,    0.298_wp,    0.723_wp,    0.244_wp,    0.168_wp, &
                           0.155_wp,    0.261_wp,    1.230_wp,    0.762_wp,    0.477_wp, &
                           1.202_wp,    0.000_wp,    0.000_wp,    0.000_wp,    0.477_wp /)

   REAL(wp), PARAMETER, DIMENSION(nconst) :: par_n =  (/                                 &
                           0.474_wp,    0.080_wp,    0.279_wp,    0.267_wp,    0.108_wp, &
                           0.125_wp,    0.288_wp,    0.307_wp,    0.353_wp,    0.323_wp, &
                           0.417_wp,    0.000_wp,    0.000_wp,    0.000_wp,    0.323_wp /)


    REAL(wp)     :: cosz = 0.7_wp                   !< cosine of fixed zenith angle (45 deg, if not specified otherwise)

!
    INTERFACE photolysis_constant
       MODULE PROCEDURE photolysis_constant
    END INTERFACE photolysis_constant
 
    INTERFACE photolysis_simple
       MODULE PROCEDURE photolysis_simple
    END INTERFACE photolysis_simple
!
!   INTERFACE photolysis_fastj
!      MODULE PROCEDURE photolysis_fastj
!   END INTERFACE photolysis_fastj
!
    INTERFACE photolysis_control
       MODULE PROCEDURE photolysis_control
    END INTERFACE photolysis_control

    SAVE

    PRIVATE

    PUBLIC  photolysis_control

    PUBLIC  photolysis_scheme

 CONTAINS


!------------------------------------------------------------------------------!
! Description:
! ------------
!> This subroutine controls the calls of the photolysis schemes
!------------------------------------------------------------------------------!
 SUBROUTINE photolysis_control
 
    IMPLICIT NONE

    SELECT CASE ( TRIM( photolysis_scheme ) )

       CASE ( 'constant' )
          CALL photolysis_constant
          
       CASE ( 'simple' )
          CALL photolysis_simple
       
!      CASE ( 'fastj' )
!         CALL photolysis_fastj

       CASE DEFAULT

    END SELECT


 END SUBROUTINE photolysis_control


!------------------------------------------------------------------------------!
! Description:
! ------------
!> This scheme keeps the prescribed net radiation constant during the run
!> Default zenith angle is 45 deg
!------------------------------------------------------------------------------!
 SUBROUTINE photolysis_constant

    IMPLICIT NONE

    INTEGER(iwp) :: iphot,iav !< loop indix for photolysis reaction

    DO  iphot = 1, nphot
       DO  iav = 1, nconst
          IF ( TRIM( names_c(iav) ) == TRIM( phot_names(iphot) ) ) THEN
!--  Prescribe fixed photolysis frequencies  [1/s]
                phot_frequen(iphot)%freq(nzb+1:nzt,:,:) =                      &
                             phot0(iav) * cosz
          ENDIF
       ENDDO
    ENDDO


 END SUBROUTINE photolysis_constant


!------------------------------------------------------------------------------!
! Description:
! ------------
!> This scheme applies a simple parameterisation for clear sky photolysis frequencies 
!> from the Master Chemical Mechanism, MCM v3.2 (http://mcm.leeds.ac.uk/MCM).
!> Reference: Saunders et al., Atmos. Chem. Phys., 3, 161, 2003
!> J = l*COSx@m*EXP(-n*SECx)  with l,m,n named par_l etc., x is the zenith angle
!------------------------------------------------------------------------------!
 SUBROUTINE photolysis_simple

    USE radiation_model_mod,                                                   &
        ONLY:  calc_zenith, cos_zenith

    IMPLICIT NONE

    INTEGER(iwp) :: iphot,iav !< loop indix for photolysis reaction
    REAL(wp)     :: coszi     !< 1./cosine of zenith angle

    DO  iphot = 1, nphot
       phot_frequen(iphot)%freq = 0.0_wp
    ENDDO

    CALL calc_zenith

    IF ( cos_zenith > 0.0_wp ) THEN
       coszi = 1. / cos_zenith

       DO iphot = 1, nphot
          DO iav = 1, nsimple
             IF ( TRIM( names_s(iav) ) == TRIM( phot_names(iphot) ) ) then
                phot_frequen(iphot)%freq(nzb+1:nzt,:,:) =                                &
                         par_l(iav) * cos_zenith**par_m(iav) * EXP( -par_n(iav) * coszi ) 
             ENDIF
          ENDDO
       ENDDO
    ENDIF


 END SUBROUTINE photolysis_simple

 END MODULE chem_photolysis_mod