q2rh: Convert absolute humidity to relative humidity

In eva3dm: Evaluation of 3D Meteorological and Air Quality Models

Convert absolute humidity to relative humidity

Description

function to convert absolute humidity to relative humidity.

Usage

q2rh(q, t = 15, p = 101325)

Arguments

q	vector (or data.frame) of absolute humidity (in g/Kg)
t	vector (or data.frame) of temperature (in Celcius)
p	vector (or data.frame) of pressure (in Pa)

Value

vector or data.frame with time and the relative humidity, units are

Note

default values are from standard atmosphere (288.15 K (15C) / 101325 Pa)

if rh and temp arguments are data.frame, both need to have the same number of lines and columns, first column (time column) will be ignored.

Examples

# for a single value (or same length vectors)
q2rh(q = 0.0002038, t = 29.3, p = 100800)

# using all data.frames
times <- seq(as.POSIXct('2024-01-01',tz = 'UTC'),
             as.POSIXct('2024-01-02',tz = 'UTC'),
             by = 'hour')[1:5]
q2   <- data.frame(time = times, a = rep(0.0002038,5))
temp <- data.frame(time = times, a = rep(     29.3,5))
pres <- data.frame(time = times, a = rep(   100800,5))
q2rh(q = q2, t = temp, p = pres)

# using data.frame for q and t (p is cte.)
q2rh(q = q2, t = temp, p = 100000)

# using data.frame for q and p (t is cte.)
q2rh(q = q2, t = 26, p = pres)

# using data.frame only for q (p and t are cte.)
q2rh(q = q2, t = 26, p = 100000)

eva3dm documentation built on April 4, 2025, 5:11 a.m.