Flux of Ozone Through Stomata
f(O3), fractional reduction of plant production (unitless)
a, plant type specific parameter (reference values below)
UO>FO3crit, instantaneous leaf uptake of O3 over a plant specific threshold (FO3crit, nmol m-2 s-1, reference values below)
FO3, flux of O3 to stomata (nmol m-2 s-1), equal to:
[O3], molar concentration of tropospheric O3 (nmol m-3)
Ra, aerodynamic and boundary layer resistance between leaf surface and reference level (s m-1)
KO3, ratio of leaf resistance for O3 to leaf resistance for water vapour (s m-1), equal to 1.67
gl, leaf conductance for H2O (m s-1), equal to:
gp, leaf conductance in the absence of O3 effects (m s-1)
Parameter |
Plant type |
||||
Broad-leaved trees |
Needle leaved trees |
Herbaceous C3 species |
Herbaceous C4 species |
Shrub |
|
FO3crit (nmol m-2 s-1) |
1.6 |
1.6 |
5.0 |
5.0 |
1.6 |
a (high plant ozone sensitivity) |
0.15 |
0.075 |
1.40 |
0.735 |
0.10 |
a (low plant ozone sensitivity) |
0.04 |
0.02 |
0.25 |
0.13 |
0.03 |
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