Calculate Saturated Vapour-Pressure (SVP)

Calculates saturated vapour pressure from air temperature. By default the equation described by the Bureau of Meteorology (BOM) and the American Meteorological Society is used. The equations described by Murray (1967) or Tetens (1930) can also be selected via the eq argument.

Usage

calc_svp(Tm, eq = "BOM")

Arguments

Tm

numeric, Temperature in degrees Celsius

eq

character, type of equation to use. Defaults to "BOM" (Bureau of Meteorology equation, Australia). Other options are "Murray" (Murray 1967) and "Tetens" (Tetens 1930). "Sapak" is accepted as a deprecated alias of "Tetens".

Value

Saturated vapour-pressure in kPa, class units

References

Murray, F. W., 1967: On the Computation of Saturation Vapor Pressure. J. Appl. Meteor. Climatol., 6, 203–204, doi:10.1175/1520-0450(1967)006<0203:OTCOSV>2.0.CO;2

Tetens, O., 1930: Uber einige meteorologische Begriffe. Zeitschrift fur Geophysik, 6, 297–309.

Examples

calc_svp(Tm = 30)
#> 4.242794 [kPa]
calc_svp(Tm = 30, eq = "Murray")
#> 4.241806 [kPa]
calc_svp(Tm = 30, eq = "Tetens")
#> 4.242926 [kPa]