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• W3141536027 abstract "Abstract Reliable partitioning of micrometeorologically measured evapotranspiration (ET) into evaporation (E) and transpiration (T) would greatly enhance our understanding of the water cycle and its response to climate change. While some methods on ET partitioning have been developed, their underlying assumptions make them difficult to apply more generally, especially in sites with large contributions of E. Here, we report a novel ET partitioning method using Artificial Neural Networks (ANN) in combination with a range of environmental input variables to predict daytime E from nighttime ET measurements. The study uses eddy covariance data from four restored wetlands in the Sacramento-San Joaquin Delta, California, USA, as well as leaf-level T data for validation. The four wetlands vary in structure from some with large areas of open water and little vegetation to very densely vegetated wetlands, representing a range of ET conditions. The ANNs were built with increasing complexity by adding the input variable that resulted in the next highest average value of model testing R 2 across all sites. The order of variable inclusion (and importance) was: vapor pressure deficit (VPD) > gap-filled sensible heat flux (H_gf) > air temperature (T air ) > friction velocity (u ∗ ) > other variables. Overall, 36 ANNs were analyzed. The model using VPD, H_gf, T air , and u ∗ (F11), showed an average testing R 2 value across all sites of 0.853. In comparison with the model that included all 10 variables (F36), F11 generally performed better during validation with independent data. In comparison to other methods described in the literature, the ANN method generated more consistent T/ET partitioning results especially for more complex sites with large E contributions. Our method improves the understanding of T/ET partitioning. While it may be particularly suited to flooded ecosystems, it can also improve T/ET partitioning in other systems, increasing our knowledge of the global water cycle." @default.
• W3141536027 created "2021-04-13" @default.
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• W3141536027 date "2021-04-06" @default.
• W3141536027 modified "2023-09-24" @default.
• W3141536027 title "A novel approach to partitioning evapotranspiration into evaporation and transpiration in flooded ecosystems" @default.
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• W3141536027 doi "https://doi.org/10.1101/2021.04.06.438244" @default.
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