136 lines
8.8 KiB
Python
136 lines
8.8 KiB
Python
# Copyright (c) 2008,2015,2016,2018 MetPy Developers.
|
|
# Distributed under the terms of the BSD 3-Clause License.
|
|
# SPDX-License-Identifier: BSD-3-Clause
|
|
|
|
# pylint: disable=line-too-long
|
|
|
|
r"""A collection of meteorologically significant constants and thermophysical property values.
|
|
|
|
Earth
|
|
-----
|
|
======================== =============== =========== ======================================= ===============================================================
|
|
Name Symbol Short Name Units Description
|
|
------------------------ --------------- ----------- --------------------------------------- ---------------------------------------------------------------
|
|
earth_avg_radius :math:`R_e` Re :math:`\text{m}` Avg. radius of the Earth [1]_
|
|
earth_gravity :math:`g` g :math:`\text{m s}^{-2}` Avg. gravity acceleration on Earth [2]_
|
|
gravitational_constant :math:`G` G :math:`\text{m}^{3} {kg}^{-1} {s}^{-2}` Gravitational constant [2]_
|
|
earth_avg_angular_vel :math:`\Omega` omega :math:`\text{rad s}^{-1}` Avg. angular velocity of Earth [1]_
|
|
earth_sfc_avg_dist_sun :math:`d` d :math:`\text{m}` Avg. distance of the Earth from the Sun [3]_
|
|
earth_solar_irradiance :math:`S` S :math:`\text{W m}^{-2}` Avg. solar irradiance of Earth [4]_
|
|
earth_max_declination :math:`\delta` delta :math:`\text{degrees}` Max. solar declination angle of Earth
|
|
earth_orbit_eccentricity :math:`e` :math:`\text{None}` Avg. eccentricity of Earth's orbit
|
|
earth_mass :math:`m_e` me :math:`\text{kg}` Total mass of the Earth (approx) [1]_ [2]_
|
|
======================== =============== =========== ======================================= ===============================================================
|
|
|
|
Water
|
|
-----
|
|
======================= ================ ========== ============================ ====================================================
|
|
Name Symbol Short Name Units Description
|
|
----------------------- ---------------- ---------- ---------------------------- ----------------------------------------------------
|
|
water_molecular_weight :math:`M_w` Mw :math:`\text{g mol}^{-1}` Molecular weight of water [5]_
|
|
water_gas_constant :math:`R_v` Rv :math:`\text{J (K kg)}^{-1}` Gas constant for water vapor [2]_ [5]_
|
|
density_water :math:`\rho_l` rho_l :math:`\text{kg m}^{-3}` Maximum recommended density of liquid water, 0-40C [5]_
|
|
wv_specific_heat_press :math:`C_{pv}` Cp_v :math:`\text{J (K kg)}^{-1}` Specific heat at constant pressure for water vapor
|
|
wv_specific_heat_vol :math:`C_{vv}` Cv_v :math:`\text{J (K kg)}^{-1}` Specific heat at constant volume for water vapor
|
|
water_specific_heat :math:`Cp_l` Cp_l :math:`\text{J (K kg)}^{-1}` Specific heat of liquid water at 0C [6]_
|
|
water_heat_vaporization :math:`L_v` Lv :math:`\text{J kg}^{-1}` Latent heat of vaporization for liquid water at 0C [7]_
|
|
water_heat_fusion :math:`L_f` Lf :math:`\text{J kg}^{-1}` Latent heat of fusion for liquid water at 0C [7]_
|
|
ice_specific_heat :math:`C_{pi}` Cp_i :math:`\text{J (K kg)}^{-1}` Specific heat of ice at 0C [7]_
|
|
density_ice :math:`\rho_i` rho_i :math:`\text{kg m}^{-3}` Density of ice at 0C
|
|
======================= ================ ========== ============================ ====================================================
|
|
|
|
Dry Air
|
|
-------
|
|
======================== ================ ============= ============================ ====================================================================
|
|
Name Symbol Short Name Units Description
|
|
------------------------ ---------------- ------------- ---------------------------- --------------------------------------------------------------------
|
|
dry_air_molecular_weight :math:`M_d` Md :math:`\text{g / mol}` Nominal molecular weight of dry air at the surface of th Earth [8]_
|
|
dry_air_gas_constant :math:`R_d` Rd :math:`\text{J (K kg)}^{-1}` Gas constant for dry air at the surface of the Earth
|
|
dry_air_spec_heat_press :math:`C_{pd}` Cp_d :math:`\text{J (K kg)}^{-1}` Specific heat at constant pressure for dry air
|
|
dry_air_spec_heat_vol :math:`C_{vd}` Cv_d :math:`\text{J (K kg)}^{-1}` Specific heat at constant volume for dry air
|
|
dry_air_density_stp :math:`\rho_d` rho_d :math:`\text{kg m}^{-3}` Density of dry air at 0C and 1000mb
|
|
======================== ================ ============= ============================ ====================================================================
|
|
|
|
General Meteorology Constants
|
|
-----------------------------
|
|
======================== ================= =========== ========================= =======================================================
|
|
Name Symbol Short Name Units Description
|
|
------------------------ ----------------- ----------- ------------------------- -------------------------------------------------------
|
|
pot_temp_ref_press :math:`P_0` P0 :math:`\text{Pa}` Reference pressure for potential temperature
|
|
poisson_exponent :math:`\kappa` kappa :math:`\text{None}` Exponent in Poisson's equation (Rd/Cp_d)
|
|
dry_adiabatic_lapse_rate :math:`\gamma_d` gamma_d :math:`\text{K km}^{-1}` The dry adiabatic lapse rate
|
|
molecular_weight_ratio :math:`\epsilon` epsilon :math:`\text{None}` Ratio of molecular weight of water to that of dry air
|
|
======================== ================= =========== ========================= =======================================================
|
|
|
|
.. [1] [Moritz2000]_
|
|
.. [2] [CODATA2018]_
|
|
.. [3] [IAU2012]_
|
|
.. [4] [Kopp2011]_
|
|
.. [5] [IAPWS2001]_
|
|
.. [6] [IAPWS1995]_
|
|
.. [7] [WMO1966]_
|
|
.. [8] [Picard2008]_
|
|
""" # noqa: E501
|
|
# pylint: enable=line-too-long
|
|
# pylint: disable=invalid-name
|
|
|
|
from .package_tools import Exporter
|
|
|
|
exporter = Exporter(globals())
|
|
|
|
# Export all the variables defined in this block
|
|
with exporter:
|
|
# Earth
|
|
earth_gravity = g = 9.80665 # 'm / s^2' x
|
|
Re = earth_avg_radius = 6371008.7714 # 'm' x
|
|
G = gravitational_constant = 6.67430e-11 # 'm^3 / kg / s^2' x
|
|
GM = geocentric_gravitational_constant = 3986005e8 # 'm^3 / s^2' x
|
|
omega = earth_avg_angular_vel = 7292115e-11 # 'rad / s' x
|
|
d = earth_sfc_avg_dist_sun = 149597870700.0 # 'm' x
|
|
S = earth_solar_irradiance = 1360.8 # 'W / m^2' x
|
|
delta = earth_max_declination = 23.45 # 'degrees' x
|
|
earth_orbit_eccentricity = 0.0167 # 'dimensionless' x
|
|
earth_mass = me = 5972169366075843731783680 # 'kg' x
|
|
|
|
# molar gas constant
|
|
R = 8.314462618 # 'J / mol / K' x
|
|
|
|
# Water
|
|
Mw = water_molecular_weight = 18.015268 # 'g / mol' x
|
|
Rv = water_gas_constant = 0.461523115726 # 'J / g / K' x
|
|
rho_l = density_water = 999.97495 # 'kg / m^3' x
|
|
wv_specific_heat_ratio = 1.330 # 'dimensionless' x
|
|
# Cp_v = (wv_specific_heat_ratio * Rv / (wv_specific_heat_ratio - 1))
|
|
Cp_v = wv_specific_heat_press = 1.860078011866 # 'J / g / K' x
|
|
# Cv_v = Cp_v / wv_specific_heat_ratio
|
|
Cv_v = wv_specific_heat_vol = 1.398554896140 # 'J / g / K' x
|
|
Cp_l = water_specific_heat = 4.2194 # 'kJ / kg / K' x
|
|
Lv = water_heat_vaporization = 2500840 # 'J / kg' x
|
|
Lf = water_heat_fusion = 333700.0 # 'J / kg' x
|
|
Cp_i = ice_specific_heat = 2090 # 'J / kg / K' x
|
|
rho_i = density_ice = 917 # 'kg / m^3' x
|
|
|
|
# Dry air
|
|
Md = dry_air_molecular_weight = 0.02896546 # 'kg / mol' x
|
|
# Rd = dry_air_gas_constant = R / Md
|
|
Rd = dry_air_gas_constant = 287.047490977185 # 'J / K / kg` x
|
|
dry_air_spec_heat_ratio = 1.4 # 'dimensionless'
|
|
# Cp_d = (dry_air_spec_heat_ratio * Rd / (dry_air_spec_heat_ratio - 1))
|
|
Cp_d = dry_air_spec_heat_press = 1004.666218420146 # 'J / K / kg` x
|
|
# Cv_d = dry_air_spec_heat_vol = Cp_d / dry_air_spec_heat_ratio
|
|
Cv_d = dry_air_spec_heat_vol = 717.618727442962 # 'J / K / kg` x
|
|
# rho_d = dry_air_density_stp = 1000.0 mbar / (Rd * 273.15 K)
|
|
rho_d = dry_air_density_stp = 1.275395968940 # 'kg / m^3' x
|
|
|
|
# General meteorology constants
|
|
P0 = pot_temp_ref_press = 1000.0 # 'mbar' x
|
|
# kappa = poisson_exponent = Rd / Cp_d
|
|
kappa = poisson_exponent = 0.285714285714 # 'dimensionless' x
|
|
# gamma_d = dry_adiabatic_lapse_rate = g / Cp_d
|
|
gamma_d = dry_adiabatic_lapse_rate = 0.009761102563 # 'K * kg * m / J / s^2' x
|
|
# epsilon = molecular_weight_ratio = Mw / Md
|
|
epsilon = molecular_weight_ratio = 0.621956910058 # 'dimensionless'
|
|
|
|
del exporter
|
|
del Exporter
|