Articles | Volume 25, issue 5
https://doi.org/10.5194/hess-25-2399-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-25-2399-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
10 May 2021
Research article |
| 10 May 2021
| 10 May 2021
Global ecosystem-scale plant hydraulic traits retrieved using model–data fusion
Department of Earth System Science, Stanford University, Stanford, CA 94305, USA
Nataniel M. Holtzman
Department of Earth System Science, Stanford University, Stanford, CA 94305, USA
Alexandra G. Konings
Department of Earth System Science, Stanford University, Stanford, CA 94305, USA
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We estimate daily evapotranspiration (ET) across the United States using the ‘surface flux equilibrium’ approach, which assumes that the balance of temperature and humidity in the atmosphere reflects recent ET on land. Using triple collocation, we compare our estimates to three other ET datasets and find that the surface flux equilibrium ET method performs well. Surface flux equilibrium ET may therefore be useful for hydrologic studies where simple, parameter-free ET estimates are advantageous.
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Model uncertainty dominates the spread in terrestrial carbon cycle predictions. Efforts to reduce it typically involve adding processes, thereby increasing model complexity. However, if and how model performance scales with complexity is unclear. Using a suite of 16 structurally distinct carbon cycle models, we find that increased complexity only improves skill if parameters are adequately informed. Otherwise, it can degrade skill, and an intermediate-complexity model is optimal.
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We quantify global plant water uptake durations after rainfall using satellite-based plant water content measurements. In wetter regions, plant water uptake occurs within a day due to rapid coupling between soil and plant water content. Drylands show multi-day plant water uptake after rain pulses, providing widespread evidence for slow rehydration responses and pulse-driven growth responses. Our results suggest that drylands are sensitive to projected shifts in rainfall intensity and frequency.
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We use a model of the 2001–2015 tropical land carbon cycle, with satellite measurements of land and atmospheric carbon, to disentangle lagged and concurrent effects (due to past and concurrent meteorological events, respectively) on annual land–atmosphere carbon exchanges. The variability of lagged effects explains most 2001–2015 inter-annual carbon flux variations. We conclude that concurrent and lagged effects need to be accurately resolved to better predict the world's land carbon sink.
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Short summary
The flow of water through plants varies with species-specific traits. To determine how they vary across the world, we mapped the traits that best allowed a model to match microwave satellite data. We also defined average values across a few clusters of trait behavior. These form a tractable solution for use in large-scale models. Transpiration estimates using these clusters were more accurate than if using plant functional types. We expect our maps to improve transpiration forecasts.
The flow of water through plants varies with species-specific traits. To determine how they vary...
