What question did this study set out to answer?

To evaluate whether optimization-based stomatal conductance models outperform traditional empirical models in simulating leaf gas exchange and land surface carbon and water fluxes.

September 16, 2018Global Change Biology

Comparing optimal and empirical stomatal conductance models for application in Earth system models

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To evaluate whether optimization-based stomatal conductance models outperform traditional empirical models in simulating leaf gas exchange and land surface carbon and water fluxes.
Compared empirical (Ball-Berry) and optimization-based (Medlyn) stomatal conductance models using field leaf gas exchange data from contrasting forest ecosystems.
Simulated gross primary productivity and evapotranspiration within the CLM5 land surface model framework benchmarked at a FLUXNET tower site.
Derived global parameter distributions for stomatal slope parameters using leaf carbon isotope (δ13C) data and intercellular-to-ambient CO2 ratios.
Simulations of stomatal conductance, coupled leaf gas exchange, gross primary productivity, and evapotranspiration showed no performance differences between the empirical and optimization models.
Model slope parameters exhibited substantial species specificity and CO2 sensitivity, where omission of CO2 sensitivity generated large overestimates of evapotranspiration in elevated CO2 scenarios.
Calibrated model parameters correlated significantly with mean annual precipitation globally, establishing a continuous trait-based parameterization method independent of discrete plant functional types.

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Implication

Model evaluation reveals equivalent accuracy between empirical and optimization-based stomatal conductance models in forests, suggesting a trait-based approach to Earth system modeling.

Cite This Study

Franks et al. (2018) studied this question.

synapsesocial.com/papers/6a6f3d36ce524a4339c33dab https://doi.org/10.1111/gcb.14445

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Implication

Model evaluation reveals equivalent accuracy between empirical and optimization-based stomatal conductance models in forests, suggesting a trait-based approach to Earth system modeling.

Comparing optimal and empirical stomatal conductance models for application in Earth system models

Key Points

Discussion

Implication

Cite This Study

Comparing optimal and empirical stomatal conductance models for application in Earth system models

Key Points

Discussion

Implication

Cite This Study

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