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| Titel |
A site-level comparison of lysimeter and eddy-covariance flux measurements of evapotranspiration |
| VerfasserIn |
Martin Hirschi, Dominik Michel, Irene Lehner, Sonia I. Seneviratne |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250109511
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| Publikation (Nr.) |
 EGU/EGU2015-10339.pdf |
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| Zusammenfassung |
| Accurate measurements of evapotranspiration are required for many meteorological,
climatological, ecological and hydrological research applications and developments. Here we
examine and compare two widely used methods to measure evapotranspiration at the site
level: lysimeter-based measurements (EL) and eddy-covariance (EC) flux measurements
(EEC). The analyses are based on parallel measurements at the research catchment
Rietholzbach in northeastern Switzerland and focuses on the period June 2009 to December
2013. The measurements are compared on the yearly, monthly, daily, and hourly time scales,
and with respect to an over 35-year lysimeter evapotranspiration time series. Overall, the two
measurement techniques agree well, especially on the annual time scale. They also agree well
with an independent catchment water-balance estimate of evapotranspiration. The good
agreement of these independent methods emphasizes the representativeness of the lysimeter
and EC measurements for the entire catchment despite their comparatively small
source areas. The study also discusses different possibilities to close the energy
balance of the EC flux measurements. From the comparison of EL and EEC, the
closure of the energy balance according to the Bowen ratio is found to be reasonable. |
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