A collection of meteorologically significant constant and thermophysical property values.
Name
Symbol
Short Name
Units
Description
earth_avg_radius
\(R_e\)
Re
\(\text{m}\)
Avg. radius of the Earth 1
earth_gravity
\(g\)
g
\(\text{m s}^{-2}\)
Avg. gravity acceleration on Earth 2
gravitational_constant
\(G\)
G
\(\text{m}^{3} {kg}^{-1} {s}^{-2}\)
Gravitational constant 2
earth_avg_angular_vel
\(\Omega\)
omega
\(\text{rad s}^{-1}\)
Avg. angular velocity of Earth 1
earth_sfc_avg_dist_sun
\(d\)
d
Avg. distance of the Earth from the Sun 3
earth_solar_irradiance
\(S\)
S
\(\text{W m}^{-2}\)
Avg. solar irradiance of Earth 4
earth_max_declination
\(\delta\)
delta
\(\text{degrees}\)
Max. solar declination angle of Earth
earth_orbit_eccentricity
\(e\)
\(\text{None}\)
Avg. eccentricity of Earth’s orbit
earth_mass
\(m_e\)
me
\(\text{kg}\)
Total mass of the Earth (approx) 1 2
water_molecular_weight
\(M_w\)
Mw
\(\text{g mol}^{-1}\)
Molecular weight of water 5
water_gas_constant
\(R_v\)
Rv
\(\text{J (K kg)}^{-1}\)
Gas constant for water vapor 2 5
density_water
\(\rho_l\)
rho_l
\(\text{kg m}^{-3}\)
Maximum recommended density of liquid water, 0-40C 5
wv_specific_heat_press
\(C_{pv}\)
Cp_v
Specific heat at constant pressure for water vapor
wv_specific_heat_vol
\(C_{vv}\)
Cv_v
Specific heat at constant volume for water vapor
water_specific_heat
\(Cp_l\)
Cp_l
Specific heat of liquid water at 0C 6
water_heat_vaporization
\(L_v\)
Lv
\(\text{J kg}^{-1}\)
Latent heat of vaporization for liquid water at 0C 7
water_heat_fusion
\(L_f\)
Lf
Latent heat of fusion for liquid water at 0C 7
ice_specific_heat
\(C_{pi}\)
Cp_i
Specific heat of ice at 0C 7
density_ice
\(\rho_i\)
rho_i
Density of ice at 0C
dry_air_molecular_weight
\(M_d\)
Md
\(\text{g / mol}\)
Nominal molecular weight of dry air at the surface of th Earth 8
dry_air_gas_constant
\(R_d\)
Rd
Gas constant for dry air at the surface of the Earth
dry_air_spec_heat_press
\(C_{pd}\)
Cp_d
Specific heat at constant pressure for dry air
dry_air_spec_heat_vol
\(C_{vd}\)
Cv_d
Specific heat at constant volume for dry air
dry_air_density_stp
\(\rho_d\)
rho_d
Density of dry air at 0C and 1000mb
pot_temp_ref_press
\(P_0\)
P0
\(\text{Pa}\)
Reference pressure for potential temperature
poisson_exponent
\(\kappa\)
kappa
Exponent in Poisson’s equation (Rd/Cp_d)
dry_adiabatic_lapse_rate
\(\gamma_d\)
gamma_d
\(\text{K km}^{-1}\)
The dry adiabatic lapse rate
molecular_weight_ratio
\(\epsilon\)
epsilon
Ratio of molecular weight of water to that of dry air
[Moritz2000]
[CODATA2018]
[IAU2012]
[Kopp2011]
[IAPWS2001]
[IAPWS1995]
[WMO1966]
[Picard2008]