Accounting for seasonal isotopic patterns of forest canopy intercepted precipitation in streamflow modeling

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Title:Main Title: Accounting for seasonal isotopic patterns of forest canopy intercepted precipitation in streamflow modeling
Description: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
Creators:Michael Stockinger (Author), Andreas L├╝cke (Author), Harry Vereecken (Author), Heye Bogena (Author)
Publisher:Elsevier Science, Amsterdam, The Netherlands
Publication Year:2018
TR32 Topic:Other
Related Subproject:C1
Subject:Keyword: Hydrology
File Details
Data Type:Text - Article
File Size:1.7 MB
Date:Available: 01.12.2017
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.
Licence:[TR32DB] Data policy agreement
Specific Information - Publication
Publication Status:Published
Review Status:Peer reviewed
Publication Type:Article
Source:Journal of Hydrology
Number of Pages:10 (31 - 40)
Metadata Details
Metadata Creator:Michael Stockinger
Metadata Created:13.07.2018
Metadata Last Updated:13.07.2018
Funding Phase:3
Metadata Language:English
Metadata Version:V50
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