tealeaves (version 1.0.6)

make_parameters: Make lists of parameters of leaf, environmental, or constant parameters

Description

Make lists of parameters of leaf, environmental, or constant parameters

make_leafpar

make_enviropar

make_constants

Usage

make_leafpar(replace = NULL)
make_enviropar(replace = NULL)
make_constants(replace = NULL)

Value

make_leafpar: An object inheriting from class leaf_par

make_enviropar: An object inheriting from class enviro_par

make_constants: An object inheriting from class constants

Arguments

replace

A named list of parameters to replace defaults. If NULL, defaults will be used.

Details

Leaf parameters:

Symbol	R	Description	Units	Default
\(d\)	leafsize	Leaf characteristic dimension	m	0.1
\(\alpha_\mathrm{l}\)	abs_l	absorbtivity of longwave radiation (4 - 80 \(\mu\)m)	none	0.97
\(\alpha_\mathrm{s}\)	abs_s	absorbtivity of shortwave radiation (0.3 - 4 \(\mu\)m)	none	0.50
\(g_\mathrm{sw}\)	g_sw	stomatal conductance to H2O	(\(\mu\)mol H2O) / (m\(^2\) s Pa)	5
\(g_\mathrm{uw}\)	g_uw	cuticular conductance to H2O	(\(\mu\)mol H2O) / (m\(^2\) s Pa)	0.1
\(\mathrm{logit}(sr)\)	logit_sr	stomatal ratio (logit transformed)	none	0 = logit(0.5)

Environment parameters:

Symbol	R	Description	Units	Default
\(P\)	P	atmospheric pressure	kPa	101.3246
\(r\)	r	reflectance for shortwave irradiance (albedo)	none	0.2
\(\mathrm{RH}\)	RH	relative humidity	none	0.50
\(S_\mathrm{sw}\)	S_sw	incident short-wave (solar) radiation flux density	W / m\(^2\)	1000
\(S_\mathrm{lw}\)	S_lw	incident long-wave radiation flux density	W / m\(^2\)	calculated
\(T_\mathrm{air}\)	T_air	air temperature	K	298.15
\(u\)	wind	windspeed	m / s	2

Constants:

Symbol	R	Description	Units	Default
\(c_p\)	c_p	heat capacity of air	J / (g K)	1.01
\(D_{h,0}\)	D_h0	diffusion coefficient for heat in air at 0 °C	m\(^2\) / s	19.0e-06
\(D_{m,0}\)	D_m0	diffusion coefficient for momentum in air at 0 °C	m\(^2\) / s	13.3e-06
\(D_{w,0}\)	D_w0	diffusion coefficient for water vapour in air at 0 C	m\(^2\) / s	21.2e-06
\(\epsilon\)	epsilon	ratio of water to air molar masses	none	0.622
\(eT\)	eT	exponent for temperature dependence of diffusion	none	1.75
\(G\)	G	gravitational acceleration	m / s\(^2\)	9.8
\(Nu\)	Nu	Nusselt number	none	calculated
\(R\)	R	ideal gas constant	J / (mol K)	8.3144598
\(R_\mathrm{air}\)	R_air	specific gas constant for dry air	J / (kg K)	287.058
\(\sigma\)	s	Stefan-Boltzmann constant	W / (m\(^2\) K\(^4\))	5.67e-08
\(Sh\)	Sh	Sherwood number	none	calculated

Examples

library(tealeaves)

# Use defaults
cs <- make_constants()
ep <- make_enviropar()
lp <- make_leafpar()

# Replace defaults

ep <- make_enviropar(
  replace = list(
    T_air = set_units(300, K)
  )
)

lp <- make_leafpar(
  replace = list(
    leafsize = set_units(c(0.1, 0.2), m)
  )
)