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@ARTICLE{Stockinger:841758,
      author       = {Stockinger, Michael and Lücke, Andreas and Vereecken,
                      Harry and Bogena, Heye},
      title        = {{A}ccounting for seasonal isotopic patterns of forest
                      canopy intercepted precipitation in streamflow modeling},
      journal      = {Journal of hydrology},
      volume       = {555},
      issn         = {0022-1694},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2018-00062},
      pages        = {31 - 40},
      year         = {2017},
      abstract     = {Forest canopy interception alters the isotopic tracer
                      signal of precipitation leading to significant isotopic
                      differences between open precipitation (δOP) and
                      throughfall (δTF). This has important consequences for the
                      tracer-based modeling of streamwater transit times. Some
                      studies have suggested using a simple static correction to
                      δOP by uniformly increasing it because δTF is rarely
                      available for hydrological modeling. Here, we used data from
                      a 38.5 ha spruce forested headwater catchment where three
                      years of δOP and δTF were available to develop a data
                      driven method that accounts for canopy effects on δOP.
                      Changes in isotopic composition, defined as the difference
                      δTF-δOP, varied seasonally with higher values during
                      winter and lower values during summer. We used this pattern
                      to derive a corrected δOP time series and analyzed the
                      impact of using (1) δOP, (2) reference throughfall data
                      (δTFref) and (3) the corrected δOP time series (δOPSine)
                      in estimating the fraction of young water (Fyw), i.e., the
                      percentage of streamflow younger than two to three months.
                      We found that Fyw derived from δOPSine came closer to
                      δTFref in comparison to δOP. Thus, a seasonally-varying
                      correction for δOP can be successfully used to infer δTF
                      where it is not available and is superior to the method of
                      using a fixed correction factor. Seasonal isotopic
                      enrichment patterns should be accounted for when estimating
                      Fyw and more generally in catchment hydrology studies using
                      other tracer methods to reduce uncertainty.},
      cin          = {IBG-3},
      ddc          = {690},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000418107600003},
      doi          = {10.1016/j.jhydrol.2017.10.003},
      url          = {https://juser.fz-juelich.de/record/841758},
}