cal_ActualVapourPressure_from_RHmaxAndRHmin {simET}

Actual vapour pressure derived from RHmax and RHmin

Description

The actual vapour pressure can also be calculated from the relative humidity. Depending on the availability of the humidity data, different equations should be used.

Usage

cal_ActualVapourPressure_from_RHmaxAndRHmin(Tmax, Tmin, RHmax, RHmin)

Arguments

Tmax

daily maximum temperature (kPa).

Tmin

daily minimum temperature (KPa).

RHmax

maximum relative humidity %.

RHmin

minimum relative humidity %.

Details

For periods of a week, ten days or a month, RHmax and RHmin are obtained by dividing the sum of the daily values by the number of days in that period.

Value

A vector for actual vapour pressure

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.