atmoslib 2.4.1

Python library for atmospheric thermodynamic calculations

atmoslib

Python library for atmospheric thermodynamics and microwave attenuation calculations. This library is used in CloudnetPy and related projects with focus on performance and minimal dependencies.

Installation

pip install atmoslib

Usage

import numpy as np
import atmoslib

t = np.array([293.15, 283.15, 273.15])     # temperature (K)
p = np.array([101325.0, 95000.0, 90000.0]) # pressure (Pa)
q = np.array([0.010, 0.005, 0.001])        # specific humidity (kg/kg)

tw = atmoslib.wet_bulb_temperature(t, p, q)

Most inputs accept scalars or NumPy arrays of any shape (broadcasting follows NumPy rules).

Available functions

Function	Description
vapor_pressure(p, q)	Vapor pressure of water (Pa)
saturation_vapor_pressure(t)	Saturation vapor pressure (Pa, Goff-Gratch, liquid/ice/mixed)
mixing_ratio(vp, p)	Mixing ratio (kg kg⁻¹)
specific_humidity(t, p, rh)	Specific humidity (kg kg⁻¹, liquid/ice/mixed)
relative_humidity(t, p, q)	Relative humidity (0–1, liquid/ice/mixed)
absolute_humidity(t, vp)	Absolute humidity (kg m⁻³)
dew_point_temperature(t, rh)	Dew-point temperature (K, Magnus)
virtual_temperature(t, q)	Virtual temperature (K)
potential_temperature(t, p)	Potential temperature (K)
equivalent_potential_temperature(t, p, q)	Equivalent potential temperature (K, Bolton 1980)
wet_bulb_temperature(t, p, q)	Wet-bulb temperature (K, iterative)
latent_heat_of_vaporization(t)	Latent heat of vaporization (J kg⁻¹)
air_density(t, p, mr)	Moist-air density (kg m⁻³)
adiabatic_lwc_gradient(t, p)	Adiabatic vertical gradient of LWC at cloud base (kg m⁻³ m⁻¹, Brenguier 1991)
hydrostatic_pressure(t, q, z, p_sfc)	Pressure profile from surface value via hypsometric equation (Pa)
isa_pressure(gph)	Pressure from geopotential height (Pa, ISA)
isa_altitude(t, p)	Geopotential height from pressure and temperature (gpm, ISA)
geometric_height(gph)	Geometric height from geopotential height (m, ECMWF)
c2k(t) / k2c(t)	Celsius ↔ Kelvin conversion
liquid_water_specific_attenuation(t, f)	Cloud liquid water specific attenuation (dB km⁻¹ per g m⁻³, ITU-R P.840)
gas_specific_attenuation(t, p, e, f)	Dry-air + water-vapor specific attenuation (dB km⁻¹, ITU-R P.676)
rain_specific_attenuation(R, f)	Rain specific attenuation (dB km⁻¹, ITU-R P.838)

See the docstrings for argument details and references.

License

MIT