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\caption{Canopy Resistance Scheme from \citet{Lee_2009}} \label{fig:CanopyResistance}  Canopy Resistance Scheme of \citet{Lee_2009}. The concentrations (C), fluxes (F) and resistances (r) refer to CO_2 but are interchangable with H_2O. r_s^c is the soil resistance, r_{a,s} is aerodynamic resistance in the canopy, r_c^c is the canopy resistance (ie transport out of the leaf), r_b^c is the leaf boundary layer resistance (transport from the leaf surface to canopy air layer), and r_a is the aerodynamic resistance. The aerodynamic resistances (r_{a,s} and r_a) are assumed to be non-fractionating as they are assumed to be driven by turbulent transport. The r_c^c is assumed to have exponent of 1 (for kinetic fractionation) as transport out of the leaf is dominated by molecular diffusion. The r_b^c exponent is $\frac{2}{3}$ as both molecular and turbulent transport are active in this layer.