make_parameters | R Documentation |
Make lists of parameters of leaf, environmental, or constant parameters
make_leafpar
make_enviropar
make_constants
make_leafpar(replace = NULL) make_enviropar(replace = NULL) make_constants(replace = NULL)
replace |
A named list of parameters to replace defaults. If |
Leaf parameters:
Symbol | R | Description | Units | Default |
d | leafsize | Leaf characteristic dimension | m | 0.1 |
α_l | abs_l | absorbtivity of longwave radiation (4 - 80 μm) | none | 0.97 |
α_s | abs_s | absorbtivity of shortwave radiation (0.3 - 4 μm) | none | 0.50 |
g_sw | g_sw | stomatal conductance to H2O | (μmol H2O) / (m^2 s Pa) | 5 |
g_uw | g_uw | cuticular conductance to H2O | (μmol H2O) / (m^2 s Pa) | 0.1 |
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 |
RH | RH | relative humidity | none | 0.50 |
S_sw | S_sw | incident short-wave (solar) radiation flux density | W / m^2 | 1000 |
S_lw | S_lw | incident long-wave radiation flux density | W / m^2 | calculated |
T_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_h0 | D_h0 | diffusion coefficient for heat in air at 0 °C | m^2 / s | 19.0e-06 |
D_m0 | D_m0 | diffusion coefficient for momentum in air at 0 °C | m^2 / s | 13.3e-06 |
D_w0 | D_w0 | diffusion coefficient for water vapour in air at 0 C | m^2 / s | 21.2e-06 |
ε | 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_air | R_air | specific gas constant for dry air | J / (kg K) | 287.058 |
σ | s | Stefan-Boltzmann constant | W / (m^2 K^4) | 5.67e-08 |
Sh | Sh | Sherwood number | none | calculated |
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
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) ) )
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