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Titel |
A multi-year comparison of lysimeter and eddy covariance measurements of evapotranspiration at the Rietholzbach catchment |
VerfasserIn |
Martin Hirschi, Dominik Michel, Irene Lehner, Sonia I. Seneviratne |
Konferenz |
EGU General Assembly 2017
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Medientyp |
Artikel
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Sprache |
en
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Digitales Dokument |
PDF |
Erschienen |
In: GRA - Volume 19 (2017) |
Datensatznummer |
250144746
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Publikation (Nr.) |
EGU/EGU2017-8610.pdf |
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Zusammenfassung |
Measurements of evapotranspiration are required for many meteorological, climatological,
ecological, and hydrological research applications and developments. Here we examine and
compare two well-established methods to determine evapotranspiration at the site level:
lysimeter-based measurements (EL) and eddy covariance (EC) flux measurements (EEC).
The analyses are based on parallel measurements carried out with these two methods at the
research catchment Rietholzbach in northeastern Switzerland, and cover the time period June
2009 to December 2015. The measurements are compared on various time scales, and with
respect to a 40-year lysimeter-based evapotranspiration time series. Overall, the lysimeter and
EC measurements agree well, especially on the annual time scale. On that time
scale, the long-term lysimeter measurements also correspond well with catchment
water-balance estimates of evapotranspiration. This highlights the representativeness of the
site-level lysimeter and EC measurements for the entire catchment despite their
comparatively small source areas and the heterogeneous land use and topography within the
catchment. Furthermore, we identify that lack of reliable EC measurements using
open-path gas analyzers during and following precipitation events (due to limitations
of the measurement technique under these conditions) significantly contributes
to an underestimation of EEC and to the overall energy balance gap at the site. |
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