A_supply function

CO2 supply and demand function (mol / m^2 s)

This function is not intended to be called by users directly.

A_supply(C_chl, pars, unitless = FALSE, use_legacy_version = FALSE)

A_demand(C_chl, pars, unitless = FALSE)

Arguments

• C_chl: Chloroplastic CO2 concentration in Pa of class units
• pars: Concatenated parameters (leaf_par, enviro_par, and constants)
• unitless: Logical. Should units be set? The function is faster when FALSE, but input must be in correct units or else results will be incorrect without any warning.
• use_legacy_version: Logical. Should legacy model (<2.1.0) be used? See NEWS for further information. Default is FALSE.

Returns

Value in mol / (m^2 s) of class units

Details

Supply function:

$$A = g_\mathrm{tc} (C_\mathrm{air} - C_\mathrm{chl})A = g_tc (C_air - C_chl)$$

Demand function:

$$A = (1 - \Gamma* / C_\mathrm{chl}) \mathrm{min}(W_\mathrm{carbox}, W_\mathrm{regen}, W_\mathrm{tpu}) - R_\mathrm{d}A = (1 - \Gamma* / C_chl) min(W_carbox, W_regen, W_tpu) - R_d$$

Symbol	R	Description	Units	Default
$A$	A	photosynthetic rate	$\mu$ mol CO2 / (m^2 s)	calculated
$g_tc$	g_tc	total conductance to CO2	$\mu$ mol CO2 / (m $^2$ s Pa)	calculated
$C_air$	C_air	atmospheric CO2 concentration	Pa	41
$C_chl$	C_chl	chloroplastic CO2 concentration	Pa	calculated
$R_d$	R_d	nonphotorespiratory CO2 release	$\mu$ mol CO2 / (m $^2$ s)	2
$\Gamma*$	gamma_star	chloroplastic CO2 compensation point	Pa	3.743

Examples

bake_par = make_bakepar()
constants = make_constants(use_tealeaves = FALSE)
enviro_par = make_enviropar(use_tealeaves = FALSE)
leaf_par = make_leafpar(use_tealeaves = FALSE)
leaf_par = bake(leaf_par, enviro_par, bake_par, constants)
# Or bake with piping (need library(magrittr))
# leaf_par %<>% bake(enviro_par, bake_par, constants)
enviro_par$T_air = leaf_par$T_leaf

pars = c(leaf_par, enviro_par, constants)
C_chl = set_units(350, umol/mol)

A_supply(C_chl, pars)

A_demand(C_chl, pars)