DOI: 10.5194/hess-21-1809-2017
Scopus记录号: 2-s2.0-85016516748
论文题名: A site-level comparison of lysimeter and eddy covariance flux measurements of evapotranspiration
作者: Hirschi M ; , Michel D ; , Lehner I ; , Seneviratne S ; I
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 3 起始页码: 1809
结束页码: 1825
语种: 英语
Scopus关键词: Electric conductivity measurement
; Evapotranspiration
; Land use
; Lysimeters
; Runoff
; Soil surveys
; Accurate measurement
; Catchment water balance
; Eddy covariance
; Flux measurements
; Gas analyzers
; Measurement techniques
; Precipitation events
; Research applications
; Catchments
; accuracy assessment
; catchment
; comparative study
; eddy covariance
; energy balance
; evapotranspiration
; lysimeter
; measurement method
; time series analysis
; Rietholzbach
; Saint Gall [Switzerland]
; Switzerland
英文摘要: Accurate 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 of June 2009 to December 2015. The measurements are compared on various timescales, and with respect to a 40-year lysimeter-based evapotranspiration time series. Overall, the lysimeter and EC measurements agree well, especially on the annual timescale. On that timescale, 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. © 2017 The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79210
Appears in Collections: 气候变化事实与影响
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作者单位: Institute for Atmospheric and Climate Science, ETH Zurich, Universitätstrasse 16, Zurich, Switzerland; Centre for Environmental and Climate Research (CEC), University of Lund, Lund, Sweden
Recommended Citation:
Hirschi M,, Michel D,, Lehner I,et al. A site-level comparison of lysimeter and eddy covariance flux measurements of evapotranspiration[J]. Hydrology and Earth System Sciences,2017-01-01,21(3)