Journal Article

FZJ-2014-05371

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Spatiotemporal relations between water budget components and soil water content in a forested tributary catchment

Graf, A. (Corresponding Author)FZJ* ; Bogena, H.FZJ* ; Drüe, C. ; Hardelauf, H.FZJ* ; Pütz, T.FZJ* ; Heinemann, G. ; Vereecken, H.FZJ*

2014
AGU Washington, DC

This record in other databases:  

Please use a persistent id in citations: http://hdl.handle.net/2128/17066  doi:10.1002/2013WR014516

Abstract: We examined 3 years of measured daily values of all major water budget components (precipitation P, potential evapotranspiration PET, actual evapotranspiration ET, and runoff R) and volumetric soil water content θ of a small, forested catchment located in the west of Germany. The spatial distribution of θ was determined from a wireless sensor network of 109 points with 3 measurement depths each; ET was calculated from eddy covariance tower measurements. The water budget was dominantly energy-limited, with ET amounting to approximately 90 % of PET, and a runoff ratio R/P of 56 %. P, ET and R closed the long-term water budget with a residual of 2% of precipitation. On the daily timescale, the residual of the water budget was larger than on the annual timescale, and explained to a moderate extent by θ (R² = 0.40). Wavelet analysis revealed sub-weekly timescales, presumably dominated by unaccounted fast-turnover storage terms such as interception, as a major source of uncertainty in water balance closure. At weekly resolution, soil water content explained more than half (R² = 0.62) of the residual. By means of combined empirical orthogonal function and cluster analysis, two slightly different spatial patterns of θ could be identified that were associated with mean θ values below and above 0.35 cm³/cm³, respectively. The timing of these patterns as well as the varying coherence between PET, ET and soil water content responded to changes in water availability, including a moderate response to the European drought in spring 2011.

---

Contributing Institute(s):

1. Agrosphäre (IBG-3)

Research Program(s):

1. TERENO - Terrestrial Environmental Observatories (TERENO-2008) (TERENO-2008)
2. 246 - Modelling and Monitoring Terrestrial Systems: Methods and Technologies (POF2-246) (POF2-246)
3. 255 - Terrestrial Systems: From Observation to Prediction (POF3-255) (POF3-255)
4. DFG project 15232683 - TRR 32: Muster und Strukturen in Boden-Pflanzen-Atmosphären-Systemen: Erfassung, Modellierung und Datenassimilation (15232683) (15232683)

Appears in the scientific report 2014

---

Database coverage:
; ; Current Contents - Agriculture, Biology and Environmental Sciences ; Current Contents - Engineering, Computing and Technology ; IF < 5 ; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

---