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- W4387372223 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> Accurate and efficient modeling of stomatal conductance (<em>g</em><sub>s</sub>) has been a key challenge in vegetation models across scales. Current practice of most land surface models (LSMs) assumes steady-state <em>g</em><sub>s</sub> and predicts stomatal responses to environmental cues as immediate jumps between stationary regimes. However, the response of stomata can be orders of magnitude slower than that of photosynthesis, and often cannot reach a steady state before the next model time-step, even on half-hourly time scales. Here, we implemented a simple dynamic <em>g</em><sub>s</sub> model in the vegetation module of an LSM developed within the Climate Modeling Alliance, and investigated the potential biases caused by the steady-state assumption from leaf to canopy scales. In comparison with steady-state models, the dynamic model better predicted the coupled temporal response of photosynthesis and stomatal conductance to changes in light intensity using leaf measurements. In ecosystem flux simulations, while the impact of <em>g</em><sub>s</sub> hysteresis response may not be substantial in terms of daily or monthly integrated canopy fluxes, our results suggested the importance of considering this effect when quantifying fluxes in the mornings and evenings, and interpreting diurnal hysteresis patterns observed in ecosystem fluxes. Furthermore, prognostic modeling can bypass the A-C<sub>i</sub> iterations required for steady-state simulations and can be robustly run with comparable computational costs. Overall, our study highlights the implications of dynamic <em>g</em><sub>s</sub> modeling in improving the accuracy and efficiency of LSMs, and for advancing our understanding of plant-environment interactions." @default.
- W4387372223 created "2023-10-06" @default.
- W4387372223 creator A5025290524 @default.
- W4387372223 date "2023-10-05" @default.
- W4387372223 modified "2023-10-16" @default.
- W4387372223 title "Reply on RC2" @default.
- W4387372223 doi "https://doi.org/10.5194/egusphere-2023-1706-ac2" @default.
- W4387372223 hasPublicationYear "2023" @default.
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