improver.constants module

Module to contain generally useful constants.

ABSOLUTE_ZERO = -273.15

0 Kelvin in degrees C

CP_DRY_AIR = 1005.0

Specific heat capacity of dry air (J K-1 kg-1)

CP_WATER_VAPOUR = 1850.0

Specific heat capacity of water vapour (J K-1 kg-1)

DALR = -0.0098

Dry Adiabatic Lapse Rate (DALR; K m-1)

EARTH_REPSILON = 0.62198

Repsilon, ratio of molecular weights of water and dry air (Earth; unitless)

EARTH_SURFACE_GRAVITY_ACCELERATION = 9.81

Acceleration due to gravity, Earth’s surface (m s-2)

ELR = -0.0065

Environmental Lapse Rate (ELR; K m-1) Also known as Standard Atmosphere Lapse Rate

LATENT_HEAT_T_DEPENDENCE = 2340.0

Latent heat temperature dependence (J K-1 kg-1); from Met Office UM. Applied to temperatures in Celsius: \(LH = 2501 - 2.34 \times 10^3 \times T(celsius)\)

LH_CONDENSATION_WATER = 2501000.0

Latent heat of condensation of water at 0C (J kg-1)

R_DRY_AIR = 287.0

Specific gas constant for dry air (J K-1 kg-1)

R_DRY_AIR_MOL = 8.314

Specific gas constant for dry air per mole (J K-1 mol-1)

R_WATER_VAPOUR = 461.6

Specific gas constant for water vapour (J K-1 kg-1)

TRIPLE_PT_WATER = 273.16

Triple Point of Water (K)

WATER_DENSITY = 1000

(kg m-3)

Type:

Density of water

WATER_VAPOUR_MOLAR_MASS = 0.01801

Molar mass of water vapour (kg mol-1)