subroutine RadSimpleFlux( xy_SurfAlbedo, xy_SurfTemp, xyr_Press, xyz_Press, xyz_Temp, xyz_QH2OVap, xyr_RadSUwFlux, xyr_RadSDwFlux, xyr_RadLUwFlux, xyr_RadLDwFlux, xyra_DelRadLUwFlux, xyra_DelRadLDwFlux )


    ! USE statements
    !

    ! メッセージ出力
    ! Message output
    !
    use dc_message, only: MessageNotify

    ! 物理・数学定数設定
    ! Physical and mathematical constants settings
    !
    use constants0, only: PI                    ! $ \pi $ .
                              ! 円周率.  Circular constant

    !
    ! Physical constants settings
    !
    use constants, only: Grav     ! $ g $ [m s-2].
                                  !
                                  ! Gravitational acceleration

    ! 座標データ設定
    ! Axes data settings
    !
    use axesset, only : y_Lat

    ! 太陽放射フラックスの設定
    ! Set solar constant
    !
    use set_solarconst, only : SetSolarConst

    ! 短波入射 (太陽入射)
    ! Short wave (insolation) incoming
    !
    use rad_short_income, only : RadShortIncome

    !
    ! Solve radiative transfer equation in two stream approximation
    !
    use rad_rte_two_stream_app, only: RadRTETwoStreamAppSW

    ! 長波フラックスの計算
    ! Calculate long wave flux
    !
    use rad_simple_LW, only : RadSimpleLWFlux


    real(DP), intent(in ) :: xy_SurfAlbedo( 0:imax-1, 1:jmax )
    real(DP), intent(in ) :: xy_SurfTemp  ( 0:imax-1, 1:jmax )
    real(DP), intent(in ) :: xyr_Press    ( 0:imax-1, 1:jmax, 0:kmax )
    real(DP), intent(in ) :: xyz_Press    ( 0:imax-1, 1:jmax, 1:kmax )
    real(DP), intent(in ) :: xyz_Temp     ( 0:imax-1, 1:jmax, 1:kmax )
    real(DP), intent(in ) :: xyz_QH2OVap  ( 0:imax-1, 1:jmax, 1:kmax )
    real(DP), intent(out) :: xyr_RadSUwFlux    ( 0:imax-1, 1:jmax, 0:kmax )
    real(DP), intent(out) :: xyr_RadSDwFlux    ( 0:imax-1, 1:jmax, 0:kmax )
    real(DP), intent(out) :: xyr_RadLUwFlux    (0:imax-1, 1:jmax, 0:kmax)
    real(DP), intent(out) :: xyr_RadLDwFlux    (0:imax-1, 1:jmax, 0:kmax)
    real(DP), intent(out) :: xyra_DelRadLUwFlux(0:imax-1, 1:jmax, 0:kmax, 0:1)
    real(DP), intent(out) :: xyra_DelRadLDwFlux(0:imax-1, 1:jmax, 0:kmax, 0:1)


    ! Work variables
    !
    real(DP) :: DistFromStarScld
                               ! Distance between the central star and the planet
    real(DP) :: DiurnalMeanFactor

    real(DP) :: SolarConst
    real(DP) :: SolarFluxTOA
!!$    real(DP) :: QeRatio
    real(DP) :: xyz_SSA       (0:imax-1, 1:jmax, 1:kmax)
    real(DP) :: xyz_AF        (0:imax-1, 1:jmax, 1:kmax)
    real(DP) :: xy_InAngle    (0:imax-1, 1:jmax)
    real(DP) :: xyz_DelAtmMass(0:imax-1, 1:jmax, 1:kmax)
    real(DP) :: xyr_OptDep    (0:imax-1, 1:jmax, 0:kmax)

    real(DP) :: xy_SurfAlbedoLW(0:imax-1, 1:jmax)
    real(DP) :: xy_SurfEmis    (0:imax-1, 1:jmax)

    integer  :: k


    ! 初期化
    ! Initialization
    !
    if ( .not. rad_Simple_inited ) then
      call MessageNotify( 'E', module_name, 'This module has not been initialized.' )
    end if


    ! Short wave radiation
    !

    ! 短波入射の計算
    ! Calculate short wave (insolation) incoming radiation
    !
    call RadShortIncome( xy_InAngle        = xy_InAngle, DistFromStarScld  = DistFromStarScld, DiurnalMeanFactor = DiurnalMeanFactor )

    ! 太陽放射フラックスの設定
    ! Set solar constant
    !
    call SetSolarConst( SolarConst )
    SolarFluxTOA = SolarConst / DistFromStarScld**2 * DiurnalMeanFactor

    xyz_SSA    = 1.0_DP - 1.0d-10
    xyz_AF     = 0.0_DP
    xyr_OptDep = 0.0_DP

    call RadRTETwoStreamAppSW( xyz_SSA, xyz_AF, xyr_OptDep, xy_SurfAlbedo, SolarFluxTOA, xy_InAngle, xyr_RadSUwFlux, xyr_RadSDwFlux )

    ! Long wave radiation
    !

    do k = 1, kmax
      xyz_DelAtmMass(:,:,k) = ( xyr_Press(:,:,k-1) - xyr_Press(:,:,k ) ) / Grav
    end do

    xy_SurfAlbedoLW = 0.0_DP
    xy_SurfEmis     = 1.0_DP

    call RadSimpleLWFlux( xy_SurfAlbedoLW, xy_SurfEmis, xyr_Press, xyz_Press, xyz_Temp, xy_SurfTemp, xyz_DelAtmMass, xyz_QH2OVap, xyr_RadLUwFlux, xyr_RadLDwFlux, xyra_DelRadLUwFlux, xyra_DelRadLDwFlux )


  end subroutine RadSimpleFlux

  subroutine RadSimpleInit

    ! ファイル入出力補助
    ! File I/O support
    !
    use dc_iounit, only: FileOpen

    ! NAMELIST ファイル入力に関するユーティリティ
    ! Utilities for NAMELIST file input
    !
    use namelist_util, only: namelist_filename, NmlutilMsg, NmlutilAryValid

    ! メッセージ出力
    ! Message output
    !
    use dc_message, only: MessageNotify

    ! 太陽放射フラックスの設定
    ! Set solar constant
    !
    use set_solarconst, only : SetSolarConstInit

    ! 短波入射 (太陽入射)
    ! Short wave (insolation) incoming
    !
    use rad_short_income, only : RadShortIncomeInit

    !
    ! Solve radiative transfer equation in two stream approximation
    !
    use rad_rte_two_stream_app, only: RadRTETwoStreamAppInit

    ! 放射フラックス (簡単長波バンドモデル)
    ! Radiation flux (simple longwave band model)
    !
    use rad_simple_LW, only : RadSimpleLWInit


    ! 宣言文 ; Declaration statements
    !

    integer:: unit_nml        ! NAMELIST ファイルオープン用装置番号.
                              ! Unit number for NAMELIST file open
    integer:: iostat_nml      ! NAMELIST 読み込み時の IOSTAT.
                              ! IOSTAT of NAMELIST read

    ! NAMELIST 変数群
    ! NAMELIST group name
    !
!!$    namelist /rad_Simple_nml/ &
!!$      & SWOptDepAtRefPress, SWRefPress, SWOrd, &
!!$      & LWOptDepAtRefPress, LWRefPress, LWOrd
          !
          ! デフォルト値については初期化手続 "rad_Simple#RadSimpleInit"
          ! のソースコードを参照のこと.
          !
          ! Refer to source codes in the initialization procedure
          ! "rad_Simple#RadSimpleInit" for the default values.
          !

    if ( rad_Simple_inited ) return


    ! デフォルト値の設定
    ! Default values settings
    !
!!$    SWOptDepAtRefPress =  3.0_DP
!!$    SWRefPress         =  3.0d5
!!$    SWOrd              =  1.0_DP
!!$
!!$    LWOptDepAtRefPress = 80.0_DP
!!$    LWRefPress         =  3.0d5
!!$    LWOrd              =  2.0_DP


    ! NAMELIST の読み込み
    ! NAMELIST is input
    !
!!$    if ( trim(namelist_filename) /= '' ) then
!!$      call FileOpen( unit_nml, &          ! (out)
!!$        & namelist_filename, mode = 'r' ) ! (in)
!!$
!!$      rewind( unit_nml )
!!$      read( unit_nml,                     & ! (in)
!!$        & nml = rad_Simple_nml,           & ! (out)
!!$        & iostat = iostat_nml )             ! (out)
!!$      close( unit_nml )
!!$
!!$      call NmlutilMsg( iostat_nml, module_name ) ! (in)
!!$    end if


    ! Initialization of modules used in this module
    !

    ! 太陽放射フラックスの設定
    ! Set solar constant
    !
    call SetSolarConstInit

    ! 短波入射 (太陽入射)
    ! Short wave (insolation) incoming
    !
    call RadShortIncomeInit

    !
    ! Solve radiative transfer equation in two stream approximation
    !
    call RadRTETwoStreamAppInit

    ! 放射フラックス (簡単長波バンドモデル)
    ! Radiation flux (simple longwave band model)
    !
    call RadSimpleLWInit


    ! 印字 ; Print
    !
    call MessageNotify( 'M', module_name, '----- Initialization Messages -----' )
!!$    call MessageNotify( 'M', module_name, 'SWOptDepAtRefPress = %f', d = (/ SWOptDepAtRefPress /) )
!!$    call MessageNotify( 'M', module_name, 'SWRefPress         = %f', d = (/ SWRefPress /) )
!!$    call MessageNotify( 'M', module_name, 'SWOrd              = %f', d = (/ SWOrd /) )
!!$    call MessageNotify( 'M', module_name, 'LWOptDepAtRefPress = %f', d = (/ LWOptDepAtRefPress /) )
!!$    call MessageNotify( 'M', module_name, 'LWRefPress         = %f', d = (/ LWRefPress /) )
!!$    call MessageNotify( 'M', module_name, 'LWOrd              = %f', d = (/ LWOrd /) )
    call MessageNotify( 'M', module_name, '-- version = %c', c1 = trim(version) )


    rad_Simple_inited = .true.

  end subroutine RadSimpleInit