Uses the Magnus approximation, which is accurate over roughly -20 to 50
degrees Celsius. This is the conversion needed to obtain the humidity
input of mwi() from reanalysis products such as ERA5-Land, which
distribute dewpoint rather than relative humidity.
Usage
relative_humidity_from_dewpoint(
dewpoint,
temperature,
m = 7.591398,
tn = 240.726
)
Arguments
- dewpoint
Numeric vector of dewpoint temperatures in degrees Celsius.
- temperature
Numeric vector of air temperatures in degrees Celsius.
- m, tn
Magnus coefficients. The defaults are the values for water vapour
over liquid water.
Value
A numeric vector of relative humidities in percent.
References
Vaisala (2013). Humidity Conversion Formulas: Calculation formulas for
humidity. Technical report B210973EN-F.
Examples
relative_humidity_from_dewpoint(dewpoint = 15, temperature = 22)
#> [1] 64.50612
# Dewpoint equal to air temperature is saturation
relative_humidity_from_dewpoint(20, 20)
#> [1] 100