[1801] - Accounting for seasonal isotopic patterns of forest canopy intercepted precipitation in streamflow modeling

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Stockinger, M., Lücke, A., Vereecken, H., Bogena, H., 2017. Accounting for seasonal isotopic patterns of forest canopy intercepted precipitation in streamflow modeling. Journal of Hydrology, 31 - 40.
Title(s):Main Title: Accounting for seasonal isotopic patterns of forest canopy intercepted precipitation in streamflow modeling
Description(s):Abstract: Forest canopy interception alters the isotopic tracer signal of precipitation leading to significant isotopic differences between open precipitation (dOP) and throughfall (dTF). This has important consequences for the tracer-based modeling of streamwater transit times. Some studies have suggested using a simple static correction to dOP by uniformly increasing it because dTF is rarely available for hydrological modeling. Here, we used data from a 38.5 ha spruce forested headwater catchment where three years of dOP and dTF were available to develop a data driven method that accounts for canopy effects on dOP. Changes in isotopic composition, defined as the difference dTF-dOP, varied seasonally with higher values during winter and lower values during summer. We used this pattern to derive a corrected dOP time series and analyzed the impact of using (1) dOP, (2) reference throughfall data (dTFref) and (3) the corrected dOP time series (dOPSine) 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 dOPSine came closer to dTFref in comparison to dOP. Thus, a seasonally-varying correction for dOP can be successfully used to infer dTF 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.
Responsible Party
Creator(s):Author: Michael Stockinger
Author: Andreas Lücke
Author: Harry Vereecken
Author: Heye Bogena
Publisher:Elsevier Science, Amsterdam, The Netherlands
TR32 Topic:Other
Related Sub-project(s):C1
Subject(s):CRC/TR32 Keywords: Hydrology
File Details
File Name:Stockingeretal2017.pdf
Data Type:Text
File Size:1774 kB (1.732 MB)
Date(s):Available: 2017-12-01
Mime Type:application/pdf
Download Permission:Free
General Access and Use Conditions:According to the TR32DB data policy agreement.
Access Limitations:According to the TR32DB data policy agreement.
North:-no map data
Measurement Region:Erkensruhr
Measurement Location:Wüstebach
Specific Informations - Publication
Source:Journal of Hydrology
Page Range:31 - 40
Metadata Details
Metadata Creator:Michael Stockinger
Metadata Created:2018-07-13
Metadata Last Updated:2018-07-13
Funding Phase:3
Metadata Language:English
Metadata Version:V43
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