%0 Journal Article
%A Stockinger, Michael
%A Lücke, Andreas
%A McDonnell, Jeffrey J.
%A Diekkrüger, Bernd
%A Vereecken, Harry
%A Bogena, Heye
%T Interception affects stable isotope driven streamwater transit time estimates
%J Geophysical research letters
%V 42
%N 13
%@ 0094-8276
%C Hoboken, NJ
%I Wiley
%M FZJ-2015-04653
%P 5299-5308
%D 2015
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000358691300028
%R 10.1002/2015GL064622
%U https://juser.fz-juelich.de/record/202392