TY  - JOUR
AU  - Stockinger, Michael
AU  - Lücke, Andreas
AU  - McDonnell, Jeffrey J.
AU  - Diekkrüger, Bernd
AU  - Vereecken, Harry
AU  - Bogena, Heye
TI  - Interception affects stable isotope driven streamwater transit time estimates
JO  - Geophysical research letters
VL  - 42
IS  - 13
SN  - 0094-8276
CY  - Hoboken, NJ
PB  - Wiley
M1  - FZJ-2015-04653
SP  - 5299-5308
PY  - 2015
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000358691300028
DO  - DOI:10.1002/2015GL064622
UR  - https://juser.fz-juelich.de/record/202392
ER  -