Specific humidity — hum_specific • fieldClim

Calculates specific humidity from vapor pressure and air pressure.

Usage

hum_specific(...)

# Default S3 method
hum_specific(rh, temp, elev, ...)

# S3 method for class 'weather_station'
hum_specific(weather_station, ...)

Arguments

...: Additional arguments.
rh: Relative humidity in %.
temp: Temperature in °C.
elev: Elevation above sea level in m.
weather_station: A weather_station object.

Value

Numeric. Specific humidity in kg/kg.

Details

Specific humidity ($q$) is the ratio of the mass of water vapor to the total mass of the air parcel. It is calculated from the vapor pressure and air pressure using the formula: $$q = 0.622 \times \frac{pvapor}{p}$$ where $pvapor$ is the vapor pressure and $p$ is the air pressure. The formula and constants follow the Bendix (2004) humidity helper background used by the package.

References

Bendix 2004, p. 262.

Examples

# Calculate specific humidity
hum_specific(rh = 70, temp = 25, elev = 100)
#> [1] 0.01396975