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| Titel |
Sensitivity of a data-driven soil water balance model to estimate summer evapotranspiration along a forest chronosequence |
| VerfasserIn |
J. A. Breña Naranjo, M. Weiler, K. Stahl |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 15, no. 11 ; Nr. 15, no. 11 (2011-11-17), S.3461-3473 |
| Datensatznummer |
250013025
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| Publikation (Nr.) |
 copernicus.org/hess-15-3461-2011.pdf |
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| Zusammenfassung |
| The hydrology of ecosystem succession gives rise to new challenges for the
analysis and modelling of water balance components. Recent large-scale
alterations of forest cover across the globe suggest that a significant
portion of new biophysical environments will influence the long-term
dynamics and limits of water fluxes compared to pre-succession conditions.
This study assesses the estimation of summer evapotranspiration along three
FLUXNET sites at Campbell River, British Columbia, Canada using a
data-driven soil water balance model validated by Eddy Covariance
measurements. It explores the sensitivity of the model to different forest
succession states, a wide range of computational time steps, rooting depths,
and canopy interception capacity values. Uncertainty in the measured EC
fluxes resulting in an energy imbalance was consistent with previous studies
and does not affect the validation of the model. The agreement between
observations and model estimates proves that the usefulness of the method to
predict summer AET over mid- and long-term periods is independent of stand age.
However, an optimal combination of the parameters rooting depth, time step
and interception capacity threshold is needed to avoid an underestimation of
AET as seen in past studies. The study suggests that summer AET could be estimated
and monitored in many more places than those equipped with Eddy Covariance
or sap-flow measurements to advance the understanding of water balance
changes in different successional ecosystems. |
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