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 Lücke (Author), Harry Vereecken (Author), Heye Bogena (Author) |
| Publisher: | Elsevier Science, Amsterdam, The Netherlands |
| Publication Year: | 2018 |
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File Details
| Filename: | Stockingeretal2017.pdf |
| Data Type: | Text - Article |
| File Size: | 1.7 MB |
| Date: | Available: 01.12.2017 |
| Mime Type: | application/pdf |
| Language: | English |
| Status: | Completed |
Constraints
| 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 |
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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 |
| Subproject: | C1 |
| Funding Phase: | 3 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Page Visits: | 658 |
| Metadata Downloads: | 0 |
| Dataset Downloads: | 0 |
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