Class saturate_t1930
In: saturate/saturate_t1930.F90

Tetens (1930) を用いた飽和比湿の算出

Evaluate saturation specific humidity with Tetens (1930)

Note that Japanese and English are described in parallel.

Tetens (1930) より, 飽和蒸気圧 $ p^{*} $ に関する以下の式 を用い, 飽和比湿および飽和比湿の温度微分の値を算出します.

Saturation specific humidity and temperature derivative of it are calculated with a folloing formula for saturation watar vapor pressure $ p^{*} $ in Tetens (1930).

\[ 

   q^{*} (T, p)
     = 611 \varepsilon
       \frac{ \exp \left( \frac{l}{R_v}
                          \left( \frac{1}{273} - \frac{1}{T} \right)
                   \right) } { p } \] \[
   \DP{q^{*} (T, p)}{T}
     = 611 \varepsilon \frac{l}{R_v T^2}
       \frac{ \exp \left( \frac{l}{R_v}
                          \left( \frac{1}{273} - \frac{1}{T} \right)
                   \right) } { p }
     = \frac{q^{*} l}{R_v T^2}

\]

ここで, $ T $ は温度, $ p $ は気圧, $ R_v $ は凝結成分の気体定数, $ varepsilon $ は凝結成分と大気の分子量比, $ l $ は凝結成分の潜熱です.

References

  • Tetens, O., 1930: Uder einige meteorologische Begriffe. Zeitschrift fur Geophysik, 6, 297--309.

Procedures List

CalcQVapSat :飽和比湿の計算
CalcDQVapSatDTemp :飽和比湿の温度微分の計算
———— :————
CalcQVapSat :Calculate saturation specific humidity
CalcDQVapSatDTemp :Calculate temperature derivative of saturation specific humidity

Methods

CalcDQVapSatDTemp   CalcQVapSat   InitCheck   SaturateInit   module_name   saturate_t1930_inited   version  

Included Modules

gridset dc_types dc_message constants namelist_util dc_iounit dc_string gtool_historyauto

Public Instance methods

CalcDQVapSatDTemp( Temp, QVapSat ) result(DQVapSatDTemp)
Function :
DQVapSatDTemp :real(DP)
: $ DP{q^{*}}{T} $ . 飽和比湿の温度微分. Temperature derivative of saturation specific humidity.
Temp :real(DP), intent(in)
: $ T $ . 温度. Temperature
QVapSat :real(DP), intent(in)
: $ q^{*} $ . 飽和比湿. Saturation specific humidity

温度 Temp と飽和比湿 QVapSat を用い, 飽和比湿の温度微分 DQVapSatDTemp を求めます.

Calculate temperature derivative of saturation specific humidity DQVapSatDTemp using temperature Temp and saturation specific humidity QVapSat.

[Source]

  function CalcDQVapSatDTemp( Temp, QVapSat ) result( DQVapSatDTemp )
    !
    ! 温度 *Temp* と飽和比湿 *QVapSat* を用い, 
    ! 飽和比湿の温度微分 *DQVapSatDTemp* を求めます. 
    !
    ! Calculate temperature derivative of saturation specific humidity 
    ! *DQVapSatDTemp* using
    ! temperature *Temp* and saturation specific humidity *QVapSat*. 
    !

    ! モジュール引用 ; USE statements
    !

    ! 物理定数設定
    ! Physical constants settings
    !
    use constants, only: GasRWet, LatentHeat, EpsV                  ! $ \epsilon_v $ . 
                              ! 水蒸気分子量比. 
                              ! Molecular weight of water vapor

    ! 宣言文 ; Declaration statements
    !
    implicit none

    real(DP), intent(in):: Temp
                              ! $ T $ . 温度. Temperature
    real(DP), intent(in):: QVapSat
                              ! $ q^{*} $ . 飽和比湿. Saturation specific humidity
    real(DP):: DQVapSatDTemp
                              ! $ \DP{q^{*}}{T} $ . 飽和比湿の温度微分. 
                              ! Temperature derivative of saturation specific humidity. 

    ! 作業変数
    ! Work variables
    !

    ! 飽和比湿計算のための文関数定義 (CalcQVapSatSF, CalcDQVapSatDTempSF)
    ! Declaration of statement function for 
    !   calculation of saturation specific humidity 
    !   ("CalcQVapSatSF", "CalcDQVapSatDTempSF")
    !
#include "../saturate/saturate_t1930_sf.f90"
    EpsVSF    = EpsV
    LatHeatSF = LatentHeat
    GasRWetSF = GasRWet

    ! 実行文 ; Executable statement
    !

    ! 飽和比湿の温度微分の計算
    ! Calculate temperature derivative of saturation specific humidity
    !
    ! CalcDQVapSatDTempSF は文関数. (実行文の直前で定義)
    ! "CalcDQVapSatDTempSF" is statement function and 
    !   is declared just before executable statement. 
    ! 
    DQVapSatDTemp = CalcDQVapSatDTempSF( Temp, QVapSat )

  end function CalcDQVapSatDTemp
CalcQVapSat( Temp, Press ) result(QVapSat)
Function :
QVapSat :real(DP)
: $ q^{*} $ . 飽和比湿. Saturation specific humidity
Temp :real(DP), intent(in)
: $ T $ . 温度. Temperature
Press :real(DP), intent(in)
: $ p $ . 気圧. Air pressure

温度 Temp と気圧 Press を用い, 飽和比湿 QVapSat を求めます.

Calculate saturation specific humidity QVapSat using temperature Temp and air pressure Press.

[Source]

  function CalcQVapSat( Temp, Press ) result( QVapSat )
    !
    ! 温度 *Temp* と気圧 *Press* を用い, 
    ! 飽和比湿 *QVapSat* を求めます. 
    !
    ! Calculate saturation specific humidity *QVapSat* using
    ! temperature *Temp* and air pressure *Press*. 
    !

    ! モジュール引用 ; USE statements
    !

    ! 物理定数設定
    ! Physical constants settings
    !
    use constants, only: GasRWet, LatentHeat, EpsV                  ! $ \epsilon_v $ . 
                              ! 水蒸気分子量比. 
                              ! Molecular weight of water vapor

    ! 宣言文 ; Declaration statements
    !
    implicit none

    real(DP), intent(in):: Temp
                              ! $ T $ . 温度. Temperature
    real(DP), intent(in):: Press
                              ! $ p $ . 気圧. Air pressure
    real(DP):: QVapSat
                              ! $ q^{*} $ . 飽和比湿. Saturation specific humidity

    ! 作業変数
    ! Work variables
    !

    ! 飽和比湿計算のための文関数定義 (CalcQVapSatSF, CalcDQVapSatDTempSF)
    ! Declaration of statement function for 
    !   calculation of saturation specific humidity 
    !   ("CalcQVapSatSF", "CalcDQVapSatDTempSF")
    !
#include "../saturate/saturate_t1930_sf.f90"
    EpsVSF    = EpsV
    LatHeatSF = LatentHeat
    GasRWetSF = GasRWet

    ! 実行文 ; Executable statement
    !

    ! 飽和比湿の計算
    ! Calculate saturation specific humidity
    !
    ! CalcQVapSatSF は文関数. (実行文の直前で定義)
    ! "CalcQVapSatSF" is statement function and 
    !   is declared just before executable statement. 
    ! 
    QVapSat = CalcQVapSatSF( Temp, Press )

  end function CalcQVapSat
saturate_t1930_inited
Variable :
saturate_t1930_inited = .false. :logical, save, public
: 初期設定フラグ. Initialization flag

Private Instance methods

InitCheck( )
Subroutine :

依存モジュールの初期化チェック

Check initialization of dependency modules

[Source]

  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
    !

    ! 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

    ! 実行文 ; Executable statement
    !

    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.' )

  end subroutine InitCheck
SaturateInit( )
Subroutine :

saturate_t1930 モジュールの初期化を行います.

"saturate_t1930" module is initialized.

[Source]

  subroutine SaturateInit
    !
    ! saturate_t1930 モジュールの初期化を行います. 
    !
    !
    ! "saturate_t1930" module is initialized. 
    !

    ! 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_filename, NmlutilMsg

    ! 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 /saturate_t1930_nml/ 
          !
          ! デフォルト値については初期化手続 "saturate_t1930#SaturateInit" 
          ! のソースコードを参照のこと. 
          !
          ! Refer to source codes in the initialization procedure
          ! "saturate_t1930#SaturateInit" for the default values. 
          !

    ! 実行文 ; Executable statement
    !

    if ( saturate_t1930_inited ) return
    call InitCheck

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


!!$    ! 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 = saturate_t1930_nml, &  ! (out)
!!$        & iostat = iostat_nml )   ! (out)
!!$      close( unit_nml )
!!$
!!$      call NmlutilMsg( iostat_nml, module_name ) ! (in)
!!$    end if

    ! 印字 ; Print
    !
    call MessageNotify( 'M', module_name, '----- Initialization Messages -----' )
    call MessageNotify( 'M', module_name, '-- version = %c', c1 = trim(version) )
    saturate_t1930_inited = .true.
  end subroutine SaturateInit
module_name
Constant :
module_name = ‘saturate_t1930‘ :character(*), parameter
: モジュールの名称. Module name
version
Constant :
version = ’$Name: dcpam5-20090225-2 $’ // ’$Id: saturate_t1930.F90,v 1.2 2008-11-23 15:08:26 morikawa Exp $’ :character(*), parameter
: モジュールのバージョン Module version

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