Journal Article

FZJ-2015-04653

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Interception affects stable isotope driven streamwater transit time estimates

Stockinger, M. (Corresponding author)FZJ* ; Lücke, A.FZJ* ; McDonnell, J. J. ; Diekkrüger, B. ; Vereecken, H.FZJ* ; Bogena, H.FZJ*

2015
Wiley Hoboken, NJ

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Please use a persistent id in citations: http://hdl.handle.net/2128/16074  doi:10.1002/2015GL064622

Abstract: Previous studies of streamwater transit time distributions (TTD) used isotope tracer information from open precipitation (OP) as inputs to lumped watershed models that simulate the discharge and isotopic composition time-series from convolutions of the effective precipitation, response time distribution, and TTDs. However, in forested catchments passage of rainfall through the forest canopy will alter the tracer signature of throughfall (TF) via interception. Here we test the effect of using TF instead of OP on TTD estimates. We sampled a 0.39 km2 catchment (Wüstebach, Germany) for a 19 month period using weekly precipitation and stream isotope data to evaluate changes in stream isotope simulation and TTDs. We found that TF had different effects on TTDs for δ18O and δ2H, with TF leading to up to four months shorter transit times. TTDs converged for both isotopes only when using TF. TF improved the stream isotope simulations. These results demonstratethe importance of canopy-induced isotope tracer changes in estimating streamwater TTDs in forested catchments.

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Contributing Institute(s):

1. Agrosphäre (IBG-3)

Research Program(s):

1. 255 - Terrestrial Systems: From Observation to Prediction (POF3-255) (POF3-255)

Appears in the scientific report 2015

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Database coverage:
; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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