estP {MeTo}

Estimate atmospheric pressure (P)

Description

Values for atmospheric pressure as a function of altitude.

Usage

estP(elev, control = list(Tko = 20))

Arguments

elev

elevation [m]

control

list for control parameters and empirical factors defined in controlDefaults and constDefaults (see Details)

Details

Control variables:

Tko: reference temperature [degreeC] at elevation z0. Often assumed to be 20 degreeC

z0: elevation at reference level [m]

a1: constant lapse rate moist air (0.0065 [K/m])

g: gravitational acceleration (9.807 [m/s2])

R: specific gas constant (287 [J/(kg K)])

Value

atmospheric pressure [kPa]

Note

eq. 3-2 of Reference

References

Allen, R. G., Pereira, L. S., Raes, D., & Smith, M. (1998). Crop evapotranspiration-Guidelines for computing crop water requirements-FAO Irrigation and drainage paper 56. FAO, Rome, 300(9).

Examples

estP(elev = 25, control = list(Tko = 20))