Abbreviation Value Unit Meaning
Ca 380 μmol mol–1 CO2 concentration in the ambient air
cp 29.3 a J mol–1 K–1 Heat capacity of air
DH20 2.14×10-5 a m2 s–1 Diffusion coefficient of heat at 20°C
Dν20 2.40×10-5 a m2 s–1 Diffusion coefficient of water vapor at 20°C
Dc20 1.57×10-5 a m2 s–1 Diffusion coefficient of CO2 at 20°C
D0 1.5b kPa Empirical parameter in the stomatal‐conductance model
HKc 79430 c J mol–1 Activation energy for Kc
HKo 36380 c J mol–1 Activation energy for Ko
HΓ* 37830 c J mol–1 Activation energy for Γ*
Hd 200000 d J mol–1 Deactivation energy
Kc25 404.9 c μmol mol–1 Michaelis‐Menten constant of Rubisco activity for CO2 at 25°C
Ko25 278.4 c mmol mol–1 Michaelis‐Menten constant of Rubisco activity for O2 at 25°C
O 210 mmol mol–1 O2 concentration in the ambient air
R 8.314 a J mol–1 K–1 Gas constant
r 0.2 e Reflectance of shortwave irradiance (albedo)
α 0.2 e Quantum yield
αs 0.6 e Absorptance of shortwave by leaf
αl 0.96 e Absorptance of longwave by leaf
Γ 42.75 c μmol mol–1 CO2 compensation point at 25°C
ε 0.97 e Emissivity of longwave by leaf
θ 0.95 e Curvature of the irradiance response curve
λ 44000 a J mol–1 Latent heat of vaporization
σ 5.6697×10-8 a W m–2 K–4 Stefan‐Boltzmann constant