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Spatio-temporal tracer variability in the glacier melt end-member - How does it affect hydrograph separation results?

Schmieder, Jan; Garvelmann, Jakob; Marke, Thomas; Strasser, Ulrich

Geochemical and isotopic tracers were often used in mixing models to estimate glacier melt contributions to streamflow, whereas the spatio‐temporal variability in the glacier melt tracer signature and its influence on tracer‐based hydrograph separation results received less attention. We present novel tracer data from a high‐elevation catchment (17 km2, glacierized area: 34%) in the Oetztal Alps (Austria) and investigated the spatial, as well as the subdaily to monthly tracer variability of supraglacial meltwater and the temporal tracer variability of winter baseflow to infer groundwater dynamics. The streamflow tracer variability during winter baseflow conditions was small, and the glacier melt tracer variation was higher, especially at the end of the ablation period. We applied a three‐component mixing model with electrical conductivity and oxygen‐18. Hydrograph separation (groundwater, glacier melt, and rain) was performed for 6 single glacier melt‐induced days (i.e., 6 events) during the ablation period 2016 (July to September). Median fractions (±uncertainty) of groundwater, glacier melt, and rain for the events were estimated ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000082764
Veröffentlicht am 14.05.2018
DOI: 10.1002/hyp.11628
Zitationen: 3
Web of Science
Zitationen: 2
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 0885-6087
KITopen-ID: 1000082764
HGF-Programm 12.02.03 (POF III, LK 01)
Erschienen in Hydrological processes
Band 32
Heft 12
Seiten 1828-1843
Vorab online veröffentlicht am 10.05.2018
Nachgewiesen in Web of Science
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