cal_ActualVapourPressure_from_psychrometricData {simET}

Actual vapour pressure (ea) derived from psychrometric data

Description

The actual vapour pressure can be determined from the difference between the dry and wet bulb temperatures, the so-called wet bulb depression.

Usage

cal_ActualVapourPressure_from_psychrometricData(Twet, Tdry, P, type)

Arguments

Twet, Tdry

wet bulb depression, with Tdry the dry bulb and Twet the wet bulb temperature (degrees Celsius).

P

is the atmospheric pressure (kPa).

type

psychrometer type ("Asmann type","natural ventilated","non-ventilated").

Value

A vector for Actual vapour pressure (ea)

References

Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. FAO Irrigation and drainage paper No. 56. Rome: Food and Agriculture Organization of the United Nations, 1998.