Class saturate_t1930 In: saturate/saturate_t1930.F90

# 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

### Included Modules

gridset dc_types dc_message constants namelist_util dc_iounit dc_string gtool_historyauto

### Public Instance methods

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

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

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

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

 Subroutine :

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

 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
!

! 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 = ’$Name: dcpam5-20090317$’ // ’$Id: saturate_t1930.F90,v 1.2 2008-11-23 15:08:26 morikawa Exp$’ :character(*), parameter
 : モジュールのバージョン Module version