WETAIR: WETAIR

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

WETAIR

Description

Calculates several properties of humid air as 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

WETAIR(db = db, wb = db, rh = 0, dp = 999, bp = 101325)

Arguments

db	Dry bulb temperature (degrees C)
wb	Wet bulb temperature (degrees C)
rh	Relative humidity (%)
dp	Dew point temperature (degrees C)
bp	Barometric pressure (pascal)

Details

Input variables are shown below. The user must supply known values for db and bp (bp at one standard atmosphere is 101 325 pascals). Values for the remaining variables are determined by whether the user has either (1) psychrometric data (wb or rh), or (2) hygrometric data (dp)

(1) Psychrometric data: If wb is known but not rh, then set rh=-1 and dp=999 If rh is known but not wb then set wb=0 and dp=999

(2) Hygrometric data: If dp is known then set wb = 0 and rh = 0.

Value

e Vapour pressure (Pa)

esat Saturation vapour pressure (Pa)

vd Vapour density (kg m-3)

rw Mixing ratio (kg kg-1)

tvir Virtual temperature (K)

tvinc Virtual temperature increment (K)

denair Density of the air (kg m-3)

cp Specific heat of air at constant pressure (J kg-1 K-1)

wtrpot Water potential (Pa)

rh Relative humidity (%)

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