dot-get_Tv: Calculate virtual temperature

Description Usage Arguments Details Value References Examples

Description

Calculate virtual temperature

Usage

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.get_Tv(Temp, p, P, epsilon, unitless)

Arguments

Temp

Temperature in Kelvin

p

water vapour pressure in kPa

P

Atmospheric pressure in kPa

epsilon

ratio of water to air molar masses (unitless)

unitless

Logical. Should function use parameters with units? The function is faster when FALSE, but input must be in correct units or else results will be incorrect without any warning.

Details

T_v = T / [1 - (1 - epsilon) (p / P)]

Eq. 2.35 in Monteith & Unsworth (2013)

Symbol R Description Units Default
ε epsilon ratio of water to air molar masses unitless 0.622
p p water vapour pressure kPa calculated
P P atmospheric pressure kPa 101.3246

Value

Value in K of class units

References

Monteith JL, Unsworth MH. 2013. Principles of Environmental Physics. 4th edition. Academic Press, London.

Examples

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library(tealeaves)

cs <- make_constants()
ep <- make_enviropar()
lp <- make_leafpar()

T_leaf <- set_units(298.15, K)
p <- ep$RH * tealeaves:::.get_ps(T_leaf, ep$P, FALSE)
tealeaves:::.get_Tv(T_leaf, p, ep$P, cs$epsilon, FALSE)

cdmuir/tealeaves documentation built on June 21, 2020, 2:32 a.m.