DRYAIR: DRYAIR

In mrke/NicheMapR: R implementation of Niche Mapper software for biophysical modelling

DRYAIR

Description

Calculates several properties of dry air and related characteristics shownas output variables below. The program is based on equations from List, R. J. 1971. Smithsonian Meteorological Tables. Smithsonian Institution Press. Washington, DC. WETAIR must be used in conjunction with function VAPPRS.

Usage

DRYAIR(db = db, bp = 0, alt = 0)

Arguments

db	Dry bulb temperature (degrees C)
bp	Barometric pressure (pascal)
alt	Altitude (m)

Details

The user must supply values for the input variables (db, bp and alt). If alt is known (-1000 < alt < 20000) but not BP, then set BP=0

Value

patmos Standard atmospheric pressure (Pa)

densty Density (kg m-3)

visdyn Dynamic viscosity (kg m-1 s-1)

viskin Kinematic viscosity (m2 s-1)

difvpr Diffusivity of water vapour in air (m2 s-1)

thcond Thermal conductivity (W m-1 K-1)

htovpr Latent heat of vapourisation of water (J kg-1)

tcoeff Temperature coefficient of volume expansion (K-1)

ggroup Group of variables in Grashof number (1-m3 -K)

bbemit black body emittance (W m-2)

emtmax Wave length of maximum emittance (m)

mrke/NicheMapR documentation built on Jan. 13, 2025, 9:11 p.m.