Using GNSS-based vegetation optical depth, tree sway motion, and eddy-covariance to examine evaporation of canopy-intercepted rainfall in a subalpine forest
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Le résumé fourni par la source
Abstract. Recent advances in the measurement of water content within a forest, have led to new possibilities to study canopy evaporation. We used a pair of Global Navigation Satellite System GNSS receivers (one above the canopy and one near the forest floor) to calculate the vegetation optical depth VOD during the warm season in a Colorado subalpine forest. One goal in our study was to compare VOD to the concurrent tree sway motion and subcanopy/above-canopy eddy-covariance evapotranspiration ET measurements. We found that VOD increased and tree sway frequency decreased during wet periods; furthermore, both measurements exhibited a linear relationship between each other and suggested that it took around 14 h after rainfall ceased for the intercepted rainwater to fully evaporate from the canopy. On dry days, we found that tree sway was more sensitive to diel changes in internal tree-water content than VOD. The ET measurements provided quantitative estimates of canopy evaporation (0.02 mm h−1 at night, to 0.08 mm h−1 during mid-day). Following rainfall, nighttime VOD, tree sway and ET all showed a steady (nearly constant) drying of the canopy. Variability in the VOD and tree sway measurements, comparisons with water content from the CLM4.5 land-surface model, and challenges with ET measurements, are also discussed.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Using GNSS-based vegetation optical depth, tree sway motion, and eddy-covariance to examine evaporation of canopy-intercepted rainfall in a subalpine forest
- Date Crossref
- 25/04/2025
- Éditeur
- Copernicus GmbH
- Type
- posted-content
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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NSF National Center for Atmospheric Research pays non établi dans la noticeStructure de recherche
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University of Colorado Boulder Department of Geography pays non établi dans la noticeUniversité ou école supérieure
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Federal Office of Meteorology and Climatology MeteoSwiss pays non établi dans la noticeOrganisme public
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University of Zurich Department of Geography pays non établi dans la noticeUniversité ou école supérieure
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Oregon State University pays non établi dans la noticeUniversité ou école supérieure
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University of Utah pays non établi dans la noticeUniversité ou école supérieure
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College of Earth pays non établi dans la noticeUniversité ou école supérieure
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School of Biological Sciences pays non établi dans la noticeUniversité ou école supérieure
NSF National Center for Atmospheric Research, Department of Geography — University of Colorado Boulder et Federal Office of Meteorology and Climatology MeteoSwiss, avec 5 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.