subroutine RadiationDTempDt( xyr_RadLFlux, xyr_RadSFlux, xyr_Press, xyz_DTempDtRadL, xyz_DTempDtRadS )
    !
    ! 放射による温度変化率を計算します. 
    ! 
    ! Temperature tendency with radiation is calculated. 
    !

    ! モジュール引用 ; USE statements
    !

    ! 物理定数設定
    ! Physical constants settings
    !
    use constants, only: Grav, CpDry    ! $ C_p $ [J kg-1 K-1]. 
                                  ! 乾燥大気の定圧比熱. 
                                  ! Specific heat of air at constant pressure

    ! 時刻管理
    ! Time control
    !
    use timeset, only: TimeN, TimesetClockStart, TimesetClockStop

    ! 宣言文 ; Declaration statements
    !
    implicit none
    real(DP), intent(in):: xyr_RadLFlux (0:imax-1, 1:jmax, 0:kmax)
                              ! 長波フラックス. 
                              ! Longwave flux
    real(DP), intent(in):: xyr_RadSFlux (0:imax-1, 1:jmax, 0:kmax)
                              ! 短波 (日射) フラックス. 
                              ! Shortwave (insolation) flux
    real(DP), intent(in):: xyr_Press    (0:imax-1, 1:jmax, 0:kmax)
                              ! $ \hat{p} $ . 気圧 (半整数レベル). 
                              ! Air pressure (half level)
    real(DP), intent(out):: xyz_DTempDtRadL (0:imax-1, 1:jmax, 1:kmax)
                              ! 長波加熱率. 
                              ! Temperature tendency with longwave
    real(DP), intent(out):: xyz_DTempDtRadS (0:imax-1, 1:jmax, 1:kmax)
                              ! 短波加熱率. 
                              ! Temperature tendency with shortwave

    ! 作業変数
    ! Work variables
    !
    integer:: k               ! 鉛直方向に回る DO ループ用作業変数
                              ! Work variables for DO loop in vertical direction

    ! 実行文 ; Executable statement
    !

    ! 計算時間計測開始
    ! Start measurement of computation time
    !
    call TimesetClockStart( module_name )

    ! 初期化
    ! Initialization
    !
    if ( .not. radiation_band_inited ) call RadiationInit

    ! 放射冷却率の演算
    ! Calculate radiation cooling rate
    !
    do k = 1, kmax
      xyz_DTempDtRadL(:,:,k) = (     xyr_RadLFlux(:,:,k-1) - xyr_RadLFlux(:,:,k) ) / ( xyr_Press(:,:,k-1)    - xyr_Press(:,:,k) ) / CpDry * Grav

      xyz_DTempDtRadS(:,:,k) = (     xyr_RadSFlux(:,:,k-1) - xyr_RadSFlux(:,:,k) ) / ( xyr_Press(:,:,k-1)    - xyr_Press(:,:,k) ) / CpDry * Grav
    end do

    ! 計算時間計測一時停止
    ! Pause measurement of computation time
    !
    call TimesetClockStop( module_name )

  end subroutine RadiationDTempDt

  subroutine RadiationFlux( xyz_Temp, xyz_QVap, xyr_Press, xy_SurfTemp, xy_SurfAlbedo, xyr_RadLFlux, xyr_RadSFlux, xyra_DelRadLFlux )
    !
    ! 温度, 比湿, 気圧から, 放射フラックスを計算します. 
    !
    ! Calculate radiation flux from temperature, specific humidity, and 
    ! air pressure. 
    !

    ! モジュール引用 ; USE statements
    !

    ! 短波入射 (太陽入射)
    ! Short wave (insolation) incoming
    !
    use radiation_short_income, only: ShortIncoming
!    use radiation_short_income_sr, only: ShortIncoming

    ! 物理定数設定
    ! Physical constants settings
    !
    use constants, only: Grav ! $ g $ [m s-2]. 
                              ! 重力加速度. 
                              ! Gravitational acceleration

    ! 時刻管理
    ! Time control
    !
    use timeset, only: TimeN, TimesetClockStart, TimesetClockStop

    ! 日付および時刻の取り扱い
    ! Date and time handler
    !
    use dc_date, only: operator(-), operator(>=), operator(+), toChar

    ! デバッグ用ユーティリティ
    ! Utilities for debug
    !
    use dc_trace, only: DbgMessage, BeginSub, EndSub, Debug

    ! 宣言文 ; Declaration statements
    !
    implicit none

    real(DP), intent(in):: xyz_Temp  (0:imax-1, 1:jmax, 1:kmax)
                              ! $ T $ .     温度. Temperature
    real(DP), intent(in):: xyz_QVap  (0:imax-1, 1:jmax, 1:kmax)
                              ! $ q $ .     比湿. Specific humidity
    real(DP), intent(in):: xyr_Press (0:imax-1, 1:jmax, 0:kmax)
                              ! $ \hat{p} $ . 気圧 (半整数レベル). 
                              ! Air pressure (half level)
    real(DP), intent(in):: xy_SurfTemp (0:imax-1, 1:jmax)
                              ! 地表面温度. 
                              ! Surface temperature
    real(DP), intent(in):: xy_SurfAlbedo (0:imax-1, 1:jmax)
                              ! 地表アルベド. 
                              ! Surface albedo

    real(DP), intent(out):: xyr_RadLFlux (0:imax-1, 1:jmax, 0:kmax)
                              ! 長波フラックス. 
                              ! Longwave flux
    real(DP), intent(out):: xyr_RadSFlux (0:imax-1, 1:jmax, 0:kmax)
                              ! 短波 (日射) フラックス. 
                              ! Shortwave (insolation) flux
    real(DP), intent(out):: xyra_DelRadLFlux (0:imax-1, 1:jmax, 0:kmax, 0:1)
                              ! 長波地表温度変化. 
                              ! Surface temperature tendency with longwave

    ! 作業変数
    ! Work variables
    !
    real(DP):: xyr_TauQVap (0:imax-1, 1:jmax, 0:kmax)
                              ! $ \int_z^{\infty} \rho q \, dz $ . 
                              ! 水に関する光学的厚さ 
                              ! $ \tau = \int_z^{\infty} k \rho q \, dz $
                              ! を吸収係数 $ k $ (高度 $ z $ に拠らず一定) 
                              ! で割ったもの.
                              ! 
                              ! Optical depth of water 
                              ! $ \tau = \int_z^{\infty} k \rho q \, dz $
                              ! divided by absorption coefficient $ k $ 
                              ! (this does not depend to height $ z $
                              ! and constant) of water
                              ! 
    real(DP):: xyr_TauDryAir (0:imax-1, 1:jmax, 0:kmax)
                              ! $ \int_z^{\infty} \rho \, dz $ . 
                              ! 空気に関する光学的厚さ 
                              ! $ \tau = \int_z^{\infty} k \rho \, dz $
                              ! を吸収係数 $ k $ (高度 $ z $ に拠らず一定) 
                              ! で割ったもの.
                              ! 
                              ! Optical depth of air 
                              ! $ \tau = \int_z^{\infty} k \rho \, dz $
                              ! divided by absorption coefficient $ k $ 
                              ! (this does not depend to height $ z $
                              ! and constant) of air
                              ! 

    integer:: k               ! 鉛直方向に回る DO ループ用作業変数
                              ! Work variables for DO loop in vertical direction
    character(STRING):: str_debug
                              ! デバッグ用変数
                              ! Variable for debug

    ! 実行文 ; Executable statement
    !

    ! 計算時間計測開始
    ! Start measurement of computation time
    !
    call TimesetClockStart( module_name )

    ! 初期化
    ! Initialization
    !
    if ( .not. radiation_band_inited ) call RadiationInit

    ! 光学的厚さを吸収係数で割ったものの計算
    ! Calculate optical depth divided by absorption coefficient
    !
    xyr_TauQVap   = 0.0_DP
    xyr_TauDryAir = 0.0_DP

    do k = kmax-1, 0, -1
      xyr_TauQVap(:,:,k) = xyr_TauQVap(:,:,k+1) + xyz_QVap(:,:,k+1) * ( xyr_Press(:,:,k) - xyr_Press(:,:,k+1) ) / Grav

      xyr_TauDryAir(:,:,k) = xyr_TauDryAir(:,:,k+1) + ( xyr_Press(:,:,k) - xyr_Press(:,:,k+1) ) / Grav
    end do

    ! 長波フラックスの算出
    ! Calculate long wave flux
    !
    if ( TimeN - PrevTimeLong >= IntTimeLong .or. .not. Old_Flux_saved ) then

      if ( .not. Old_Flux_saved ) then
        PrevTimeLong = TimeN
      else
        PrevTimeLong = PrevTimeLong + IntTimeLong
      end if

      if ( Debug() ) then
        str_debug = toChar(TimeN)
        call DbgMessage( '%c: LongFlux is calculated at %c', c1 = module_name, c2 = trim(str_debug) )
      end if

      call LongFlux( xyz_Temp, xy_SurfTemp, xyr_TauQVap, xyr_TauDryAir, xyr_RadLFlux, xyra_DelRadLFlux )                     ! (out)

    ! 前回の値を利用
    ! Use values in last time
    !
    else

      if ( Debug() ) then
        str_debug = toChar(TimeN)
        call DbgMessage( '%c: LongFlux is not calculated at %c. Save values are used.', c1 = module_name, c2 = trim(str_debug) )
      end if

      xyr_RadLFlux = xyr_RadLFluxSave
      xyra_DelRadLFlux = xyra_DelRadLFluxSave
       
      do k = 0, kmax
        xyr_RadLFlux(:,:,k) = xyr_RadLFlux(:,:,k) + xyra_DelRadLFlux(:,:,k,1) * ( xyz_Temp(:,:,1) - xy_TempSave )

        xyra_DelRadLFlux(:,:,k,1) = xyra_DelRadLFlux(:,:,k,1) / ( xy_TempSave**3 ) * ( xyz_Temp(:,:,1)**3 )
      end do
    end if

    ! 短波 (日射) フラックスの算出
    ! Calculate short wave (insolation)
    !
    if ( TimeN - PrevTimeShort >= IntTimeShort .or. .not. Old_Flux_saved ) then

      if ( .not. Old_Flux_saved ) then
        PrevTimeShort = TimeN
      else
        PrevTimeShort = PrevTimeShort + IntTimeShort
      end if

      if ( Debug() ) then
        str_debug = toChar(TimeN)
        call DbgMessage( '%c: ShortFlux is calculated at %c', c1 = module_name, c2 = trim(str_debug) )
      end if

      ! 短波入射の計算
      ! Calculate short wave (insolation) incoming radiation
      !
      call ShortIncoming( xy_IncomRadSFlux, xy_InAngle ) ! (out)

      ! 短波フラックスの計算
      ! Calculate short wave (insolation) flux
      !
      xyr_RadSFlux = 0.0_DP
      xyr_RadSFlux(:,:,kmax) = xy_IncomRadSFlux

      call ShortFlux( xyr_TauQVap, xyr_TauDryAir, xy_SurfAlbedo, xyr_RadSFlux )                               ! (inout)

    ! 前回の値を利用
    ! Use values in last time
    ! 
    else

      if ( Debug() ) then
        str_debug = toChar(TimeN)
        call DbgMessage( '%c: ShortFlux is not calculated at %c. Save values are used.', c1 = module_name, c2 = trim(str_debug) )
      end if

      xyr_RadSFlux = xyr_RadSFluxSave
    end if


    ! 今回計算した値を保存
    ! Save calculated values in this time
    !
    xy_TempSave          = xyz_Temp (:,:,1)
    xyr_RadLFluxSave     = xyr_RadLFlux
    xyr_RadSFluxSave     = xyr_RadSFlux
    xyra_DelRadLFluxSave = xyra_DelRadLFlux

    Old_Flux_saved = .true.

    ! 計算時間計測一時停止
    ! Pause measurement of computation time
    !
    call TimesetClockStop( module_name )

  end subroutine RadiationFlux

  subroutine RadiationFluxOutput( xyr_RadSFlux, xyr_RadLFlux, xyra_DelRadLFlux, xy_DSurfTempDt )
    !
    ! 放射フラックス (xyr_RadSFlux, xyr_RadLFlux) 
    ! について, その他の引数を用いて補正し, 出力を行う. 
    !
    ! Radiation fluxes (xyr_RadSFlux, xyr_RadLFlux) are
    ! corrected by using other arguments, and the corrected values are output.
    !

    ! モジュール引用 ; USE statements
    !

    ! 時刻管理
    ! Time control
    !
    use timeset, only: DelTime, TimeN, TimesetClockStart, TimesetClockStop

    ! ヒストリデータ出力
    ! History data output
    !
    use gtool_historyauto, only: HistoryAutoPut

    ! 宣言文 ; Declaration statements
    !
    implicit none
    real(DP), intent(in):: xyr_RadSFlux (0:imax-1, 1:jmax, 0:kmax)
                              ! 短波 (日射) フラックス. 
                              ! Shortwave (insolation) flux
    real(DP), intent(in):: xyr_RadLFlux (0:imax-1, 1:jmax, 0:kmax)
                              ! 長波フラックス. 
                              ! Longwave flux
    real(DP), intent(in):: xyra_DelRadLFlux (0:imax-1, 1:jmax, 0:kmax, 0:1)
                              ! 長波地表温度変化. 
                              ! Surface temperature tendency with longwave
    real(DP), intent(in):: xy_DSurfTempDt (0:imax-1, 1:jmax)
                              ! 地表面温度変化率. 
                              ! Surface temperature tendency

    ! 出力のための作業変数
    ! Work variables for output
    !
    real(DP):: xyr_RadLFluxCor (0:imax-1, 1:jmax, 0:kmax)
                              ! 補正された長波フラックス. 
                              ! Corrected longwave flux

    ! 作業変数
    ! Work variables
    !
    integer:: k               ! 鉛直方向に回る DO ループ用作業変数
                              ! Work variables for DO loop in vertical direction
    ! 実行文 ; Executable statement
    !

    ! 計算時間計測開始
    ! Start measurement of computation time
    !
    call TimesetClockStart( module_name )

    ! 初期化
    ! Initialization
    !
    if ( .not. radiation_band_inited ) call RadiationInit

    ! 長波フラックスの補正 ( 地表フラックス分の補正 )
    ! Correct longwave flux ( amount of surface flux )
    !
    do k = 0, kmax
      xyr_RadLFluxCor (:,:,k) = xyr_RadLFlux (:,:,k) + xyra_DelRadLFlux(:,:,k,0) * xy_DSurfTempDt (:,:) * DelTime
    end do

    ! ヒストリデータ出力
    ! History data output
    !
    call HistoryAutoPut( TimeN, 'OLR', xyr_RadLFluxCor(:,:,kmax) )
    call HistoryAutoPut( TimeN, 'SLR', xyr_RadLFluxCor(:,:,0) )
    call HistoryAutoPut( TimeN, 'OSR', xyr_RadSFlux(:,:,kmax) )
    call HistoryAutoPut( TimeN, 'SSR', xyr_RadSFlux(:,:,0) )

    ! 計算時間計測一時停止
    ! Pause measurement of computation time
    !
    call TimesetClockStop( module_name )

  end subroutine RadiationFluxOutput

  subroutine InitCheck
    !
    ! 依存モジュールの初期化チェック
    !
    ! Check initialization of dependency modules

    ! モジュール引用 ; USE statements
    !

    ! 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_util_inited

    ! 格子点設定
    ! Grid points settings
    !
    use gridset, only: gridset_inited

    ! 物理定数設定
    ! Physical constants settings
    !
    use constants, only: constants_inited

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

    ! 時刻管理
    ! Time control
    !
    use timeset, only: timeset_inited

    ! 実行文 ; Executable statement
    !

    if ( .not. namelist_util_inited ) call MessageNotify( 'E', module_name, '"namelist_util" module is not initialized.' )

    if ( .not. gridset_inited ) call MessageNotify( 'E', module_name, '"gridset" module is not initialized.' )

    if ( .not. constants_inited ) call MessageNotify( 'E', module_name, '"constants" module is not initialized.' )

    if ( .not. axesset_inited ) call MessageNotify( 'E', module_name, '"axesset" module is not initialized.' )

    if ( .not. timeset_inited ) call MessageNotify( 'E', module_name, '"timeset" module is not initialized.' )

  end subroutine InitCheck

  subroutine LongFlux( xyz_Temp, xy_SurfTemp, xyr_TauQVap, xyr_TauDryAir, xyr_RadLFlux, xyra_DelRadLFlux )
    !
    ! 長波フラックスの計算
    !
    ! Calculate long wave flux
    !

    ! モジュール引用 ; USE statements
    !

    ! 物理定数設定
    ! Physical constants settings
    !
    use constants, only: StB  ! $ \sigma_{SB} $ . 
                              ! ステファンボルツマン定数. 
                              ! Stefan-Boltzmann constant

    ! 宣言文 ; Declaration statements
    !
    implicit none
    real(DP), intent(in):: xyz_Temp (0:imax-1, 1:jmax, 1:kmax)
                              ! $ T $ .     温度. Temperature

    real(DP), intent(in):: xy_SurfTemp (0:imax-1, 1:jmax)
                              ! 地表面温度. 
                              ! Surface temperature
    real(DP), intent(in):: xyr_TauQVap (0:imax-1, 1:jmax, 0:kmax)
                              ! $ \int_z^{\infty} \rho q \, dz $ . 
                              ! 水に関する光学的厚さ 
                              ! $ \tau = \int_z^{\infty} k \rho q \, dz $
                              ! を吸収係数 $ k $ (高度 $ z $ に拠らず一定) 
                              ! で割ったもの.
                              ! 
                              ! Optical depth of water 
                              ! $ \tau = \int_z^{\infty} k \rho q \, dz $
                              ! divided by absorption coefficient $ k $ 
                              ! (this does not depend to height $ z $
                              ! and constant) of water
                              ! 
    real(DP), intent(in):: xyr_TauDryAir (0:imax-1, 1:jmax, 0:kmax)
                              ! $ \int_z^{\infty} \rho \, dz $ . 
                              ! 空気に関する光学的厚さ 
                              ! $ \tau = \int_z^{\infty} k \rho \, dz $
                              ! を吸収係数 $ k $ (高度 $ z $ に拠らず一定) 
                              ! で割ったもの.
                              ! 
                              ! Optical depth of air 
                              ! $ \tau = \int_z^{\infty} k \rho \, dz $
                              ! divided by absorption coefficient $ k $ 
                              ! (this does not depend to height $ z $
                              ! and constant) of air
                              ! 
    real(DP), intent(out):: xyr_RadLFlux (0:imax-1, 1:jmax, 0:kmax)
                              ! 長波フラックス. 
                              ! Longwave flux
    real(DP), intent(out):: xyra_DelRadLFlux (0:imax-1, 1:jmax, 0:kmax, 0:1)
                              ! 長波地表温度変化. 
                              ! Surface temperature tendency with longwave

    ! 作業変数
    ! Work variables
    !
    real(DP):: xyr_Trans (0:imax-1, 1:jmax, 0:kmax)
                              ! 透過係数. 
                              ! Transmission coefficient
    real(DP):: xyr_Trans1 (0:imax-1, 1:jmax, 0:kmax)
                              ! 1/2 レベルからの透過係数. 
                              ! Transmission coefficient above 1/2 level
    real(DP):: xyr_Trans2 (0:imax-1, 1:jmax, 0:kmax)
                              ! 3/2 レベルからの透過係数. 
                              ! Transmission coefficient above 3/2 level
    real(DP):: xyz_PiB (0:imax-1, 1:jmax, 1:kmax)
                              ! $ \pi B = \sigma T^{4} $
    real(DP):: xy_SurfPiB (0:imax-1, 1:jmax)
                              ! 地表面の $ \pi B $ . 
                              ! $ \pi B $ on surface

    real(DP):: BandWeightSum  ! バンドウェイトの和
                              ! Sum of band weights

    integer:: k, kk           ! 鉛直方向に回る DO ループ用作業変数
                              ! Work variables for DO loop in vertical direction
    integer:: bn              ! 波長について回る DO ループ用作業変数
                              ! Work variables for DO loop in wavenumber bands

    ! 実行文 ; Executable statement
    !

    ! バンドウェイトの設定
    ! Configure band weight
    !
    BandWeightSum = 0.0_DP

    do bn = 1, LongBandNum
      BandWeightSum =  BandWeightSum + LongBandWeight(bn)
    end do

    do bn = 1, LongBandNum
      LongBandWeight(bn) = LongBandWeight(bn) / BandWeightSum
    end do

    ! $ \pi B $ の計算
    ! Calculate $ \pi B $
    !
    xyz_PiB    = StB * ( xyz_Temp**4 )
    xy_SurfPiB = StB * ( xy_SurfTemp**4 )

    do k = 0, kmax

      ! 透過関数計算
      ! Calculate transmission functions
      !
      xyr_Trans = 0.0_DP
      
      do bn = 1, LongBandNum
        do kk = 0, kmax
          xyr_Trans(:,:,kk) = xyr_Trans(:,:,kk) + LongBandWeight(bn) * exp( - LongPathLengthFact * (   LongAbsorpCoeffQVap(bn) * abs(   xyr_TauQVap(:,:,kk) - xyr_TauQVap(:,:,k)  ) + LongAbsorpCoeffDryAir(bn) * abs(   xyr_TauDryAir(:,:,kk) - xyr_TauDryAir(:,:,k)  ) ) )
        end do
      end do

      ! 放射フラックス計算
      ! Calculate radiation flux
      !
      xyr_RadLFlux(:,:,k) = xy_SurfPiB * xyr_Trans(:,:,0)

      do kk = 0, kmax-1
        xyr_RadLFlux(:,:,k) = xyr_RadLFlux(:,:,k) - xyz_PiB(:,:,kk+1) * ( xyr_Trans(:,:,kk) - xyr_Trans(:,:,kk+1) )
      end do

      ! 補正項計算用透過関数計算
      ! Calculate transmission functions for correction terms
      !
      xyr_Trans1(:,:,k) = xyr_Trans(:,:,0)
      xyr_Trans2(:,:,k) = xyr_Trans(:,:,1)

    end do

    ! 長波地表温度変化の計算
    ! Calclate surface temperature tendency with long wave
    !
    do k = 0, kmax
      xyra_DelRadLFlux(:,:,k,0) = 4.0_DP * xy_SurfPiB / xy_SurfTemp * xyr_Trans1(:,:,k)

      xyra_DelRadLFlux(:,:,k,1) = 4.0_DP * xyz_PiB(:,:,1) / xyz_Temp(:,:,1) * ( xyr_Trans2(:,:,k) - xyr_Trans1(:,:,k) )
    end do

  end subroutine LongFlux

  subroutine RadiationInit
    !
    ! radiation_band モジュールの初期化を行います. 
    ! NAMELIST#radiation_band_nml の読み込みはこの手続きで行われます. 
    !
    ! "radiation_band" module is initialized. 
    ! "NAMELIST#radiation_band_nml" is loaded in this procedure. 
    !

    ! モジュール引用 ; USE statements
    !

    ! 時刻管理
    ! Time control
    !
    use timeset, only: StartTime             ! 計算開始時刻. 

    ! 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

    ! 日付および時刻の取り扱い
    ! Date and time handler
    !
    use dc_date, only: DCDiffTimeCreate

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

    ! 種別型パラメタ
    ! Kind type parameter
    !
    use dc_types, only: STDOUT ! 標準出力の装置番号. Unit number of standard output

    ! 文字列操作
    ! Character handling
    !
    use dc_string, only: StoA

    ! ヒストリデータ出力
    ! History data output
    !
    use gtool_historyauto, only: HistoryAutoAddVariable

    ! 宣言文 ; Declaration statements
    !
    implicit none

    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 /radiation_band_nml/ DelTimeLongValue, DelTimeLongUnit, DelTimeShortValue, DelTimeShortUnit, LongBandNum, LongAbsorpCoeffQVap, LongAbsorpCoeffDryAir, LongBandWeight, LongPathLengthFact, ShortBandNum, ShortAbsorpCoeffQVap, ShortAbsorpCoeffDryAir, ShortBandWeight, ShortSecScat
          !
          ! デフォルト値については初期化手続 "radiation_band#RadiationInit" 
          ! のソースコードを参照のこと. 
          !
          ! Refer to source codes in the initialization procedure
          ! "radiation_band#RadiationInit" for the default values. 
          !

    ! 実行文 ; Executable statement
    !

    if ( radiation_band_inited ) return
    call InitCheck

    ! デフォルト値の設定
    ! Default values settings
    !

    ! 長波フラックス用情報
    ! Information for long wave flux
    !
    PrevTimeLong = StartTime

    DelTimeLongValue = 3.0_DP
    DelTimeLongUnit  = 'hrs.'

    LongBandNum      = 4
    LongAbsorpCoeffQVap    = -999.9_DP
    LongAbsorpCoeffDryAir  = -999.9_DP
    LongBandWeight         = -999.9_DP
    LongAbsorpCoeffQVap   (1:LongBandNum) = (/ 8.0_DP, 1.0_DP, 0.1_DP, 0.0_DP /)
    LongAbsorpCoeffDryAir (1:LongBandNum) = (/ 0.0_DP, 0.0_DP, 0.0_DP, 5.0e-5_DP /)
    LongBandWeight        (1:LongBandNum) = (/ 0.2_DP, 0.1_DP, 0.1_DP, 0.6_DP /)
    LongPathLengthFact = 1.5_DP

    ! 短波フラックス用情報
    ! Information for short wave flux
    !
    PrevTimeShort = StartTime

    DelTimeShortValue = 1.0_DP
    DelTimeShortUnit  = 'hrs.'

    ShortBandNum = 1
    ShortAbsorpCoeffQVap   = -999.9_DP
    ShortAbsorpCoeffDryAir = -999.9_DP
    ShortBandWeight        = -999.9_DP
    ShortAbsorpCoeffQVap   (1:ShortBandNum) = (/ 0.002_DP /)
    ShortAbsorpCoeffDryAir (1:ShortBandNum) = (/ 0.0_DP /)
    ShortBandWeight        (1:ShortBandNum) = (/ 1.0_DP /)
    ShortSecScat = 1.66_DP

    ! NAMELIST の読み込み
    ! NAMELIST is input
    !
    if ( trim(namelist_filename) /= '' ) then
      call FileOpen( unit_nml, namelist_filename, mode = 'r' ) ! (in)

      rewind( unit_nml )
      read( unit_nml, nml = radiation_band_nml, iostat = iostat_nml )        ! (out)
      close( unit_nml )

      call NmlutilMsg( iostat_nml, module_name ) ! (in)
    end if

    ! 時間間隔の処理
    ! Handle interval time
    !
    call DCDiffTimeCreate( IntTimeLong, DelTimeLongValue, DelTimeLongUnit )   ! (in)
    call DCDiffTimeCreate( IntTimeShort, DelTimeShortValue, DelTimeShortUnit ) ! (in)

    ! バンド数, 吸収係数, バンドウェイトのチェック
    ! Check number of band, absorption coefficients, band weight
    !
    call NmlutilAryValid( module_name, LongAbsorpCoeffQVap, 'LongAbsorpCoeffQVap', LongBandNum,         'LongBandNum' )          ! (in)

    call NmlutilAryValid( module_name, LongAbsorpCoeffDryAir, 'LongAbsorpCoeffDryAir', LongBandNum,           'LongBandNum' )            ! (in)

    call NmlutilAryValid( module_name, LongBandWeight, 'LongBandWeight', LongBandNum,    'LongBandNum' )      ! (in)

    call NmlutilAryValid( module_name, ShortAbsorpCoeffQVap, 'ShortAbsorpCoeffQVap', ShortBandNum,         'ShortBandNum' )          ! (in)

    call NmlutilAryValid( module_name, ShortAbsorpCoeffDryAir, 'ShortAbsorpCoeffDryAir', ShortBandNum,           'ShortBandNum' )            ! (in)

    call NmlutilAryValid( module_name, ShortBandWeight, 'ShortBandWeight', ShortBandNum,    'ShortBandNum' )      ! (in)

    ! 短波入射用変数の割付
    ! Allocate variables for short wave (insolation) incoming radiation
    !
    allocate( xy_IncomRadSFlux (0:imax-1, 1:jmax) )
    allocate( xy_InAngle (0:imax-1, 1:jmax) )

    ! 保存用の変数の割り付け
    ! Allocate variables for saving
    !
    allocate( xy_TempSave          (0:imax-1, 1:jmax) )
    allocate( xyr_RadLFluxSave     (0:imax-1, 1:jmax, 0:kmax) )
    allocate( xyr_RadSFluxSave     (0:imax-1, 1:jmax, 0:kmax) )
    allocate( xyra_DelRadLFluxSave (0:imax-1, 1:jmax, 0:kmax, 0:1) )

    ! ヒストリデータ出力のためのへの変数登録
    ! Register of variables for history data output
    !
    call HistoryAutoAddVariable( 'OLR', (/ 'lon ', 'lat ', 'time' /), 'outgoing longwave', 'W m-2' )

    call HistoryAutoAddVariable( 'SLR', (/ 'lon ', 'lat ', 'time' /), 'surface longwave', 'W m-2' )

    call HistoryAutoAddVariable( 'OSR', (/ 'lon ', 'lat ', 'time' /), 'outgoing shortwave', 'W m-2' )

    call HistoryAutoAddVariable( 'SSR', (/ 'lon ', 'lat ', 'time' /), 'surface shortwave', 'W m-2' )

    ! 印字 ; Print
    !
    call MessageNotify( 'M', module_name, '----- Initialization Messages -----' )
    call MessageNotify( 'M', module_name, 'DelTime:' )
    call MessageNotify( 'M', module_name, '  DelTimeLong  = %f [%c]', d = (/ DelTimeLongValue /), c1 = trim( DelTimeLongUnit ) )
    call MessageNotify( 'M', module_name, '  DelTimeShort = %f [%c]', d = (/ DelTimeShortValue /), c1 = trim( DelTimeShortUnit ) )
!
    call MessageNotify( 'M', module_name, 'LongFlux:' )
    call MessageNotify( 'M', module_name, '  LongBandNum            = %d', i = (/ LongBandNum /) )
    call MessageNotify( 'M', module_name, '  LongAbsorpCoeffQVap    = (/ %*r /)', r = real( LongAbsorpCoeffQVap(1:LongBandNum) ), n = (/ LongBandNum /) )
    call MessageNotify( 'M', module_name, '  LongAbsorpCoeffDryAir  = (/ %*r /)', r = real( LongAbsorpCoeffDryAir(1:LongBandNum) ), n = (/ LongBandNum /) )
    call MessageNotify( 'M', module_name, '  LongBandWeight         = (/ %*r /)', r = real( LongBandWeight(1:LongBandNum) ), n = (/ LongBandNum /) )
    call MessageNotify( 'M', module_name, '  LongPathLengthFact     = %f', d = (/ LongPathLengthFact /) )
!
    call MessageNotify( 'M', module_name, 'ShortFlux:' )
    call MessageNotify( 'M', module_name, '  ShortBandNum           = %d', i = (/ ShortBandNum /) )
    call MessageNotify( 'M', module_name, '  ShortAbsorpCoeffQVap   = (/ %*r /)', r = real( ShortAbsorpCoeffQVap(1:ShortBandNum) ), n = (/ ShortBandNum /) )
    call MessageNotify( 'M', module_name, '  ShortAbsorpCoeffDryAir = (/ %*r /)', r = real( ShortAbsorpCoeffDryAir(1:ShortBandNum) ), n = (/ ShortBandNum /) )
    call MessageNotify( 'M', module_name, '  ShortBandWeight        = (/ %*r /)', r = real( ShortBandWeight(1:ShortBandNum) ), n = (/ ShortBandNum /) )
    call MessageNotify( 'M', module_name, '  ShortSecScat           = %f', d = (/ ShortSecScat /) )

    call MessageNotify( 'M', module_name, '-- version = %c', c1 = trim(version) )

    radiation_band_inited = .true.
  end subroutine RadiationInit

  subroutine ShortFlux( xyr_TauQVap, xyr_TauDryAir, xy_SurfAlbedo, xyr_RadSFlux )
    !
    ! 短波フラックスを計算します.
    !
    ! Calculate short wave flux. 
    !

    ! モジュール引用 ; USE statements
    !

    ! 宣言文 ; Declaration statements
    !
    implicit none

    real(DP), intent(in):: xyr_TauQVap (0:imax-1, 1:jmax, 0:kmax)
                              ! $ \int_z^{\infty} \rho q \, dz $ . 
                              ! 水に関する光学的厚さ 
                              ! $ \tau = \int_z^{\infty} k \rho q \, dz $
                              ! を吸収係数 $ k $ (高度 $ z $ に拠らず一定) 
                              ! で割ったもの.
                              ! 
                              ! Optical depth of water 
                              ! $ \tau = \int_z^{\infty} k \rho q \, dz $
                              ! divided by absorption coefficient $ k $ 
                              ! (this does not depend to height $ z $
                              ! and constant) of water
                              ! 
    real(DP), intent(in):: xyr_TauDryAir (0:imax-1, 1:jmax, 0:kmax)
                              ! $ \int_z^{\infty} \rho \, dz $ . 
                              ! 空気に関する光学的厚さ 
                              ! $ \tau = \int_z^{\infty} k \rho \, dz $
                              ! を吸収係数 $ k $ (高度 $ z $ に拠らず一定) 
                              ! で割ったもの.
                              ! 
                              ! Optical depth of air 
                              ! $ \tau = \int_z^{\infty} k \rho \, dz $
                              ! divided by absorption coefficient $ k $ 
                              ! (this does not depend to height $ z $
                              ! and constant) of air
                              ! 
    real(DP), intent(in):: xy_SurfAlbedo (0:imax-1, 1:jmax)
                              ! 地表アルベド. 
                              ! Surface albedo
    real(DP), intent(inout):: xyr_RadSFlux (0:imax-1, 1:jmax, 0:kmax)
                              ! 短波 (日射) フラックス. 
                              ! Shortwave (insolation) flux

    ! 作業変数
    ! Work variables
    !
    real(DP):: BandWeightSum  ! バンドウェイトの和
                              ! Sum of band weights
    integer:: k               ! 鉛直方向に回る DO ループ用作業変数
                              ! Work variables for DO loop in vertical direction
    integer:: bn              ! 波長について回る DO ループ用作業変数
                              ! Work variables for DO loop in wavenumber bands

    ! 実行文 ; Executable statement
    !

    ! バンドウェイトの設定
    ! Configure band weight
    !
    BandWeightSum = 0.0_DP

    do bn = 1, ShortBandNum
      BandWeightSum = BandWeightSum + ShortBandWeight(bn)
    end do

    do bn = 1, ShortBandNum
      ShortBandWeight(bn) = ShortBandWeight(bn) / BandWeightSum
    end do

    do bn = 1, ShortBandNum
      do k = 0, kmax

        ! 各レベルでの下向き透過
        ! Downward transmission on each level
        !
        if ( k /= kmax ) then
          xyr_RadSFlux(:,:,k) = xyr_RadSFlux(:,:,k) + ShortBandWeight(bn) * xyr_RadSFlux(:,:,kmax) * exp( - xy_InAngle(:,:) * (   ShortAbsorpCoeffQVap(bn) * xyr_TauQVap(:,:,k) + ShortAbsorpCoeffDryAir(bn) * xyr_TauDryAir(:,:,k) ) )
        end if
        
        ! 各レベルでの上向き透過
        ! Upward transmission on each level
        !
        xyr_RadSFlux(:,:,k) = xyr_RadSFlux(:,:,k) - ShortBandWeight(bn) * xyr_RadSFlux(:,:,kmax) * exp( - xy_InAngle(:,:) * (   ShortAbsorpCoeffQVap(bn) * xyr_TauQVap(:,:,0) + ShortAbsorpCoeffDryAir(bn) * xyr_TauDryAir(:,:,0) ) ) * xy_SurfAlbedo * exp( - ShortSecScat * (   ShortAbsorpCoeffQVap(bn) * ( xyr_TauQVap(:,:,0) - xyr_TauQVap(:,:,k) ) + ShortAbsorpCoeffDryAir(bn) * ( xyr_TauDryAir(:,:,0) - xyr_TauDryAir(:,:,k) ) ) )
      end do
    end do

    ! 吸収なしの場合
    ! In the case of no absorption
    !
    if ( ShortBandNum == 0 ) then
      do k = 0, kmax
        xyr_RadSFlux(:,:,k) = ( 1.0_DP - xy_SurfAlbedo ) * xyr_RadSFlux(:,:,kmax)
      end do
    end if

  end subroutine ShortFlux