A Common Stomatal Parameter Set Used to Simulate the Energy and Water Balance over Boreal and Temperate Forests

Yamazaki, Takeshi; Katō, K.; Ito, Tamaki; Nakai, T.; Matsumoto, Kazuho; Miki, Naoko; Park, Hotaek; Ohta, Takeshi

doi:10.2151/jmsj.2013-303

Cited by 6 publications

(3 citation statements)

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“…To calibrate the vegetation parameters for orchards, we use a Latin Hypercube approach (Pianosi et al, 2015) to generate 600 parameter sets for m and V c,max . Parameter values are sampled across the uniform distribution of the entire range of values considered reasonable for any vegetation type; for m that range was 4 to 12 and for V c,max that range was 20 to 120 (Göhler et al, 2013; Jefferson et al, 2017; Kattage et al, 2009; Yamazaki et al, 2013). As these parameters are hard coded in the ParFlow.CLM model and the model is computationally demanding, a larger set of parameters was deemed unnecessary.…”

Section: Methodsmentioning

confidence: 99%

“…Previous studies have found that the most sensitive vegetation parameters in CLM control the slope of the relationship between photosynthesis and r s and the carboxylation rate (Göhler et al, 2013;Jefferson et al, 2017;Li et al, 2013) that range was 20 to 120 (Göhler et al, 2013;Jefferson et al, 2017;Kattage et al, 2009;Yamazaki et al, 2013). As these parameters are hard coded in the ParFlow.CLM model and the model is computationally demanding, a larger set of parameters was deemed unnecessary.…”

Section: Model Scenariosmentioning

confidence: 99%

“…Most efforts to parameterize PFTs in CLM rely on sensitivity analysis, observations of total ET or a combination of the two for PFT parameter selection. Sensitivity analyses of the CLM showed that the maximum rate of carboxylation and the Ball‐Berry stomatal resistance slope parameter are the most sensitive parameters that affect simulated ET (Göhler et al, 2013; Yamazaki et al, 2013). More recent efforts have added a crop tool to new versions of CLM (versions 4.5 and 5.0) and parameterized certain row crops using total ET estimated from flux towers, focusing on winter vegetation (Boas et al, 2021; Lu et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Integrating partitioned evapotranspiration data into hydrologic models: Vegetation parameterization and uncertainty quantification of simulated plant water use

Schreiner-McGraw

Ajami

Anderson

et al. 2022

Hydrological Processes

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Accurate simulation of plant water use across agricultural ecosystems is essential for various applications, including precision agriculture, quantifying groundwater recharge, and optimizing irrigation rates. Previous approaches to integrating plant water use data into hydrologic models have relied on evapotranspiration (ET) observations. Recently, the flux variance similarity approach has been developed to partition ET to transpiration (T) and evaporation, providing an opportunity to use T data to parameterize models. To explore the value of T/ET data in improving hydrologic model performance, we examined multiple approaches to incorporate these observations for vegetation parameterization. We used ET observations from five eddy covariance towers located in the irrigated San Joaquin Valley, California, to parameterize orchard crops in an integrated land surface-groundwater model. By using ET, or both ET and T data, we examined the impact of multiple model parameterization approaches ranging from simple performance metrics to the generalized likelihood uncertainty estimation method. We find that a simple approach of selecting the parameter sets based on ET and T performance metrics works best at these study sites. Selecting parameters based on performance relative to observed ET creates an uncertainty of 27% relative to the observed value. When parameters are selected using both T and ET data, this uncertainty drops to 24%. Similarly, the uncertainty in potential groundwater recharge drops from 63% to 58% when parameters are selected with ET or T and ET data, respectively. While these improvements are minor in an irrigated setting, the value of partitioning ET data may be more useful in non-irrigated settings. Additionally, using crop type parameters results in similar levels of simulated ET as using site-specific parameters. Different irrigation schemes create high amounts of uncertainty and highlight the need for accurate estimates of irrigation when performing water budget studies.

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