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Add constants4 directory (#5)
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* add constants4 directory for single precision constants
* modify CMakeLists.txt
* modify constants.F90 and fmsconstants.F90
* modify constants4/constants4.F90 and constants4/fmsconstants4.F90
* update constants4/fmsconstants4.F90
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binli2337 authored Oct 20, 2021
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2 changes: 2 additions & 0 deletions CMakeLists.txt
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Expand Up @@ -94,6 +94,8 @@ list(APPEND fms_fortran_src_files
column_diagnostics/column_diagnostics.F90
constants/constants.F90
constants/fmsconstants.F90
constants4/constants4.F90
constants4/fmsconstants4.F90
coupler/atmos_ocean_fluxes.F90
coupler/coupler_types.F90
coupler/ensemble_manager.F90
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176 changes: 176 additions & 0 deletions constants4/constants4.F90
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!***********************************************************************
!* GNU Lesser General Public License
!*
!* This file is part of the GFDL Flexible Modeling System (FMS).
!*
!* FMS is free software: you can redistribute it and/or modify it under
!* the terms of the GNU Lesser General Public License as published by
!* the Free Software Foundation, either version 3 of the License, or (at
!* your option) any later version.
!*
!* FMS 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 Lesser General Public
!* License along with FMS. If not, see <http://www.gnu.org/licenses/>.
!***********************************************************************
!> @defgroup constants_mod constants_mod
!> @ingroup constants
!> @brief Defines useful constants for Earth. Constants are defined as real
!! parameters. Constants are accessed through the "use" statement.
!> @author Bruce Wyman
!!
!> Constants have been declared as type REAL, PARAMETER.
!!
!! The value a constant can not be changed in a users program.
!! New constants can be defined in terms of values from the
!! constants module using a parameter statement.<br><br>
!!
!! The name given to a particular constant may be changed.<br><br>
!!
!! Constants can be used on the right side on an assignment statement
!! (their value can not be reassigned).
!!
!! Example:
!!
!! @verbatim
!! use constants_mod, only: TFREEZE, grav_new => GRAV
!! real, parameter :: grav_inv = 1.0 / grav_new
!! tempc(:,:,:) = tempk(:,:,:) - TFREEZE
!! geopotential(:,:) = height(:,:) * grav_new
!! @endverbatim

!> @file
!> @brief File for @ref constants_mod

!> @addtogroup constants_mod
!> @{
module constantsR4_mod

!---variable for strong typing grid parameters
use platform_mod, only: r8_kind, r4_kind
implicit none
private

! Include variable "version" to be written to log file.
#include<file_version.h>
!-----------------------------------------------------------------------
! version is public so that write_version_number can be called for constants_mod
! by fms_init
public :: version

real(r4_kind) :: realnumber !< dummy variable to use in HUGE initializations

!! The small_fac parameter is used to alter the radius of the earth to allow one to
!! examine non-hydrostatic effects without the need to run full-earth high-resolution
!! simulations (<13km) that will tax hardware resources.
#ifdef SMALL_EARTH
#if defined(DCMIP) || (defined(HIWPP) && defined(SUPER_K))
real(r4_kind), public, parameter :: small_fac = 1._r8_kind / 120._r8_kind ! only needed for supercell test
#elif defined(HIWPP)
real(r4_kind), public, parameter :: small_fac = 1._r8_kind / 166.7_r8_kind
#else
real(r4_kind), public, parameter :: small_fac = 1._r8_kind / 10._r8_kind
#endif
#else
real(r4_kind), public, parameter :: small_fac = 1._r8_kind
#endif

#ifdef GFS_PHYS
! SJL: the following are from fv3_gfsphysics/gfs_physics/physics/physcons.f90
real(r4_kind), public, parameter :: RADIUS = 6.3712e+6_r8_kind * small_fac !< Radius of the Earth [m]
real(kind=r8_kind), public, parameter :: PI_8 = 3.1415926535897931_r8_kind !< Ratio of circle circumference to diameter [N/A]
real(r4_kind), public, parameter :: PI = 3.1415926535897931_r8_kind !< Ratio of circle circumference to diameter [N/A]
real(r4_kind), public, parameter :: OMEGA = 7.2921e-5_r8_kind / small_fac !< Rotation rate of the Earth [1/s]
real(r4_kind), public, parameter :: GRAV = 9.80665_r8_kind !< Acceleration due to gravity [m/s^2]
real(kind=r8_kind), public, parameter :: GRAV_8 = 9.80665_r8_kind !< Acceleration due to gravity [m/s^2] (REAL(KIND=8))
real(r4_kind), public, parameter :: RDGAS = 287.05_r8_kind !< Gas constant for dry air [J/kg/deg]
real(r4_kind), public, parameter :: RVGAS = 461.50_r8_kind !< Gas constant for water vapor [J/kg/deg]
! Extra:
real(r4_kind), public, parameter :: HLV = 2.5e6_r8_kind !< Latent heat of evaporation [J/kg]
real(r4_kind), public, parameter :: HLF = 3.3358e5_r8_kind !< Latent heat of fusion [J/kg]
real(r4_kind), public, parameter :: con_cliq = 4.1855e+3_r8_kind !< spec heat H2O liq [J/kg/K]
real(r4_kind), public, parameter :: con_csol = 2.1060e+3_r8_kind !< spec heat H2O ice [J/kg/K]
real(r4_kind), public, parameter :: CP_AIR = 1004.6_r8_kind !< Specific heat capacity of dry air at constant pressure [J/kg/deg]
real(r4_kind), public, parameter :: KAPPA = RDGAS/CP_AIR !< RDGAS / CP_AIR [dimensionless]
real(r4_kind), public, parameter :: TFREEZE = 273.15_r8_kind !< Freezing temperature of fresh water [K]

#else

real(r4_kind), public, parameter :: RADIUS = 6371.0e+3_r8_kind * small_fac !< Radius of the Earth [m]
real(kind=8), public, parameter :: PI_8 = 3.14159265358979323846_r8_kind !< Ratio of circle circumference to diameter [N/A]
real(r4_kind), public, parameter :: PI = 3.14159265358979323846_r8_kind !< Ratio of circle circumference to diameter [N/A]
real(r4_kind), public, parameter :: OMEGA = 7.292e-5_r8_kind / small_fac !< Rotation rate of the Earth [1/s]
real(r4_kind), public, parameter :: GRAV = 9.80_r8_kind !< Acceleration due to gravity [m/s^2]
real(r4_kind), public, parameter :: RDGAS = 287.04_r8_kind !< Gas constant for dry air [J/kg/deg]
real(r4_kind), public, parameter :: RVGAS = 461.50_r8_kind !< Gas constant for water vapor [J/kg/deg]
! Extra:
real(r4_kind), public, parameter :: HLV = 2.500e6_r8_kind !< Latent heat of evaporation [J/kg]
real(r4_kind), public, parameter :: HLF = 3.34e5_r8_kind !< Latent heat of fusion [J/kg]
real(r4_kind), public, parameter :: KAPPA = 2.0_r8_kind/7.0_r8_kind !< RDGAS / CP_AIR [dimensionless]
real(r4_kind), public, parameter :: CP_AIR = RDGAS/KAPPA !< Specific heat capacity of dry air at constant pressure [J/kg/deg]
real(r4_kind), public, parameter :: TFREEZE = 273.16_r8_kind !< Freezing temperature of fresh water [K]
#endif

real(r4_kind), public, parameter :: STEFAN = 5.6734e-8_r8_kind !< Stefan-Boltzmann constant [W/m^2/deg^4]

real(r4_kind), public, parameter :: CP_VAPOR = 4.0_r8_kind*RVGAS !< Specific heat capacity of water vapor at constant pressure [J/kg/deg]
real(r4_kind), public, parameter :: CP_OCEAN = 3989.24495292815_r8_kind !< Specific heat capacity taken from McDougall (2002)
!! "Potential Enthalpy ..." [J/kg/deg]
real(r4_kind), public, parameter :: RHO0 = 1.035e3_r8_kind !< Average density of sea water [kg/m^3]
real(r4_kind), public, parameter :: RHO0R = 1.0_r8_kind/RHO0 !< Reciprocal of average density of sea water [m^3/kg]
real(r4_kind), public, parameter :: RHO_CP = RHO0*CP_OCEAN !< (kg/m^3)*(cal/kg/deg C)(joules/cal) = (joules/m^3/deg C) [J/m^3/deg]

real(r4_kind), public, parameter :: ES0 = 1.0_r8_kind !< Humidity factor. Controls the humidity content of the atmosphere through
!! the Saturation Vapour Pressure expression when using DO_SIMPLE. [dimensionless]
real(r4_kind), public, parameter :: DENS_H2O = 1000._r8_kind !< Density of liquid water [kg/m^3]
real(r4_kind), public, parameter :: HLS = HLV + HLF !< Latent heat of sublimation [J/kg]

real(r4_kind), public, parameter :: WTMAIR = 2.896440E+01_r8_kind !< Molecular weight of air [AMU]
real(r4_kind), public, parameter :: WTMH2O = WTMAIR*(RDGAS/RVGAS) !< Molecular weight of water [AMU]
real(r4_kind), public, parameter :: WTMOZONE = 47.99820_r8_kind !< Molecular weight of ozone [AMU]
real(r4_kind), public, parameter :: WTMC = 12.00000_r8_kind !< Molecular weight of carbon [AMU]
real(r4_kind), public, parameter :: WTMCO2 = 44.00995_r8_kind !< Molecular weight of carbon dioxide [AMU]
real(r4_kind), public, parameter :: WTMCH4 = 16.0425_r8_kind !< Molecular weight of methane [AMU]
real(r4_kind), public, parameter :: WTMO2 = 31.9988_r8_kind !< Molecular weight of molecular oxygen [AMU]
real(r4_kind), public, parameter :: WTMCFC11 = 137.3681_r8_kind !< Molecular weight of CFC-11 (CCl3F) [AMU]
real(r4_kind), public, parameter :: WTMCFC12 = 120.9135_r8_kind !< Molecular weight of CFC-21 (CCl2F2) [AMU]
real(r4_kind), public, parameter :: WTMN = 14.0067_r8_kind !< Molecular weight of Nitrogen [AMU]
real(r4_kind), public, parameter :: DIFFAC = 1.660000E+00_r8_kind !< Diffusivity factor [dimensionless]
real(r4_kind), public, parameter :: AVOGNO = 6.023000E+23_r8_kind !< Avogadro's number [atoms/mole]
real(r4_kind), public, parameter :: PSTD = 1.013250E+06_r8_kind !< Mean sea level pressure [dynes/cm^2]
real(r4_kind), public, parameter :: PSTD_MKS = 101325.0_r8_kind !< Mean sea level pressure [N/m^2]

real(r4_kind), public, parameter :: SECONDS_PER_DAY = 8.640000E+04_r8_kind !< Seconds in a day [s]
real(r4_kind), public, parameter :: SECONDS_PER_HOUR = 3600._r8_kind !< Seconds in an hour [s]
real(r4_kind), public, parameter :: SECONDS_PER_MINUTE = 60._r8_kind !< Seconds in a minute [s]
real(r4_kind), public, parameter :: RAD_TO_DEG = 180._r8_kind/PI !< Degrees per radian [deg/rad]
real(r4_kind), public, parameter :: DEG_TO_RAD = PI/180._r8_kind !< Radians per degree [rad/deg]
real(r4_kind), public, parameter :: RADIAN = RAD_TO_DEG !< Equal to RAD_TO_DEG for backward compatability. [rad/deg]
real(r4_kind), public, parameter :: ALOGMIN = -50.0_r8_kind !< Minimum value allowed as argument to log function [N/A]
real(r4_kind), public, parameter :: EPSLN = 1.0e-40_r8_kind !< A small number to prevent divide by zero exceptions [N/A]

real(r4_kind), public, parameter :: RADCON = ((1.0E+02*GRAV)/(1.0E+04*CP_AIR))*SECONDS_PER_DAY !< Factor used to convert flux divergence to
!! heating rate in degrees per day [deg sec/(cm day)]
real(r4_kind), public, parameter :: RADCON_MKS = (GRAV/CP_AIR)*SECONDS_PER_DAY !< Factor used to convert flux divergence to
!! heating rate in degrees per day [deg sec/(m day)]
real(r4_kind), public, parameter :: O2MIXRAT = 2.0953E-01_r8_kind !< Mixing ratio of molecular oxygen in air [dimensionless]
real(r4_kind), public, parameter :: RHOAIR = 1.292269_r8_kind !< Reference atmospheric density [kg/m^3]
real(r4_kind), public, parameter :: VONKARM = 0.40_r8_kind !< Von Karman constant [dimensionless]
real(r4_kind), public, parameter :: C2DBARS = 1.e-4_r8_kind !< Converts rho*g*z (in mks) to dbars: 1dbar = 10^4 (kg/m^3)(m/s^2)m [dbars]
real(r4_kind), public, parameter :: KELVIN = 273.15_r8_kind !< Degrees Kelvin at zero Celsius [K]

public :: constants_init

contains

!> @brief dummy routine.
subroutine constants_init

end subroutine constants_init

end module constantsR4_mod
!> @}
! close documentation grouping
32 changes: 32 additions & 0 deletions constants4/fmsconstants4.F90
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!***********************************************************************
!* GNU Lesser General Public License
!*
!* This file is part of the GFDL Flexible Modeling System (FMS).
!*
!* FMS is free software: you can redistribute it and/or modify it under
!* the terms of the GNU Lesser General Public License as published by
!* the Free Software Foundation, either version 3 of the License, or (at
!* your option) any later version.
!*
!* FMS 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 Lesser General Public
!* License along with FMS. If not, see <http://www.gnu.org/licenses/>.
!***********************************************************************
!> @defgroup fmsconstants FMSconstants
!> @ingroup libfms
!> @brief Essentially a copy of @ref constants_mod for external usage alongside
!! @ref libfms.
!!
!> See @ref constants_mod for individual parameter information.
module FMSconstantsR4

!> rename to not conflict with any other version vars
use constantsR4_mod, version_constants => version

implicit none

end module FMSconstantsR4

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