Group atmos_const

Constants for atmospheric thermodynamics and chemistry.

Public Attributes

Type	Name
real(rk), parameter	canopy_const_mod::beta_n = `0.35\_rk` Stability parameter beta for neutral conditions (dimensionless)
real(rk), parameter	canopy_const_mod::cpd = `7.0 \* [rdgas](namespacecanopy__const__mod.md#variable-rdgas) / 2.0` Specific heat of dry air at constant pressure [J/kg-K].
real(rk), parameter	canopy_const_mod::cpwvap = `4.0 \* [rwvap](namespacecanopy__const__mod.md#variable-rwvap)` Specific heat for water vapor at constant pressure [J/kg-K].
real(rk), parameter	canopy_const_mod::cvd = `5.0 \* [rdgas](namespacecanopy__const__mod.md#variable-rdgas) / 2.0` Specific heat of dry air at constant volume [J/kg-K].
real(rk), parameter	canopy_const_mod::cvwvap = `3.0 \* [rwvap](namespacecanopy__const__mod.md#variable-rwvap)` Specific heat for water vapor at constant volume [J/kg-K].
real(rk), parameter	canopy_const_mod::dlvdt = `2370.0` Rate of change of latent heat of vaporization w.r.t.
real(rk), parameter	canopy_const_mod::lf0 = `3.34e5` Latent heat of fusion of water at 0°C [J/kg].
real(rk), parameter	canopy_const_mod::lv0 = `2.501e6` Latent heat of vaporization of water at 0°C [J/kg].
real(rk), parameter	canopy_const_mod::mwair = `28.9628\_rk` Mean molecular weight for dry air [g/mol].
real(rk), parameter	canopy_const_mod::mwwat = `18.01528\_rk` Mean molecular weight for water vapor [g/mol].
real(rk), parameter	canopy_const_mod::rdgas = `1.0e3 \* [rgasuniv](namespacecanopy__const__mod.md#variable-rgasuniv) / [mwair](namespacecanopy__const__mod.md#variable-mwair)` Dry-air gas constant [J/kg-K].
real(rk), parameter	canopy_const_mod::rwvap = `1.0e3 \* [rgasuniv](namespacecanopy__const__mod.md#variable-rgasuniv) / [mwwat](namespacecanopy__const__mod.md#variable-mwwat)` Gas constant for water vapor [J/kg-K].
real(rk), parameter	canopy_const_mod::vonk = `0.4\_rk` Von Karman constant (dimensionless)
real(rk), parameter	canopy_const_mod::vp0 = `611.29\_rk` Vapor pressure of water at 0°C Pa __

Public Attributes Documentation

variable beta_n

Stability parameter beta for neutral conditions (dimensionless)

real(rk), parameter canopy_const_mod::beta_n;

Source: Bonan et al. (2018) https://doi.org/10.5194/gmd-11-1467-2018

variable cpd

Specific heat of dry air at constant pressure [J/kg-K].

real(rk), parameter canopy_const_mod::cpd;

1004.7642148 J/kg-K. Calculated assuming dry air is classical ideal gas

variable cpwvap

Specific heat for water vapor at constant pressure [J/kg-K].

real(rk), parameter canopy_const_mod::cpwvap;

1846.0997042 J/kg-K. Calculated assuming water vapor is classical ideal gas

variable cvd

Specific heat of dry air at constant volume [J/kg-K].

real(rk), parameter canopy_const_mod::cvd;

717.68872485 J/kg-K. Calculated assuming dry air is classical ideal gas

variable cvwvap

Specific heat for water vapor at constant volume [J/kg-K].

real(rk), parameter canopy_const_mod::cvwvap;

1384.5747781 J/kg-K. Calculated assuming water vapor is classical ideal gas

variable dlvdt

Rate of change of latent heat of vaporization w.r.t.

real(rk), parameter canopy_const_mod::dlvdt;

temperature [J/kg-K]

variable lf0

Latent heat of fusion of water at 0°C [J/kg].

real(rk), parameter canopy_const_mod::lf0;

variable lv0

Latent heat of vaporization of water at 0°C [J/kg].

real(rk), parameter canopy_const_mod::lv0;

Values from p. 641 of Stull (1988)

variable mwair

Mean molecular weight for dry air [g/mol].

real(rk), parameter canopy_const_mod::mwair;

78.06% N2, 21% O2, and 0.943% A on a mole fraction basis (Source: Hobbs, 1995, pp. 69-70)

variable mwwat

Mean molecular weight for water vapor [g/mol].

real(rk), parameter canopy_const_mod::mwwat;

variable rdgas

Dry-air gas constant [J/kg-K].

real(rk), parameter canopy_const_mod::rdgas;

287.07548994 J/kg-K

variable rwvap

Gas constant for water vapor [J/kg-K].

real(rk), parameter canopy_const_mod::rwvap;

461.52492604 J/kg-K

variable vonk

Von Karman constant (dimensionless)

real(rk), parameter canopy_const_mod::vonk;

variable vp0

Vapor pressure of water at 0°C Pa __

real(rk), parameter canopy_const_mod::vp0;