Journal cover Journal topic
Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Hydrol. Earth Syst. Sci., 20, 1197-1210, 2016
https://doi.org/10.5194/hess-20-1197-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
21 Mar 2016
Stable oxygen isotope variability in two contrasting glacier river catchments in Greenland
Jacob C. Yde1, Niels T. Knudsen2, Jørgen P. Steffensen3, Jonathan L. Carrivick4, Bent Hasholt5, Thomas Ingeman-Nielsen6, Christian Kronborg2, Nicolaj K. Larsen2, Sebastian H. Mernild1,7, Hans Oerter8, David H. Roberts9, and Andrew J. Russell10 1Faculty of Engineering and Science, Sogn og Fjordane University College, Sogndal, Norway
2Department of Geoscience, University of Aarhus, Aarhus, Denmark
3Centre for Ice and Climate, University of Copenhagen, Copenhagen, Denmark
4School of Geography and water@leeds, University of Leeds, Leeds, UK
5Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark
6Arctic Technology Centre, Technical University of Denmark, Kgs. Lyngby, Denmark
7Antarctic and Sub-Antarctic Program, Universidad de Magallanes, Punta Arenas, Chile
8Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
9Department of Geography, University of Durham, Durham, UK
10School of Geography, Politics & Sociology, Newcastle University, Newcastle upon Tyne, UK
Abstract. Analysis of stable oxygen isotope (δ18O) characteristics is a useful tool to investigate water provenance in glacier river systems. In order to attain knowledge on the diversity of δ18O variations in Greenlandic rivers, we examined two contrasting glacierised catchments disconnected from the Greenland Ice Sheet (GrIS). At the Mittivakkat Gletscher river, a small river draining a local temperate glacier in southeast Greenland, diurnal oscillations in δ18O occurred with a 3 h time lag to the diurnal oscillations in run-off. The mean annual δ18O was −14.68 ± 0.18 ‰ during the peak flow period. A hydrograph separation analysis revealed that the ice melt component constituted 82 ± 5 % of the total run-off and dominated the observed variations during peak flow in August 2004. The snowmelt component peaked between 10:00 and 13:00 local time, reflecting the long travel time and an inefficient distributed subglacial drainage network in the upper part of the glacier. At the Kuannersuit Glacier river on the island Qeqertarsuaq in west Greenland, the δ18O characteristics were examined after the major 1995–1998 glacier surge event. The mean annual δ18O was −19.47 ± 0.55 ‰. Despite large spatial variations in the δ18O values of glacier ice on the newly formed glacier tongue, there were no diurnal oscillations in the bulk meltwater emanating from the glacier in the post-surge years. This is likely a consequence of a tortuous subglacial drainage system consisting of linked cavities, which formed during the surge event. Overall, a comparison of the δ18O compositions from glacial river water in Greenland shows distinct differences between water draining local glaciers and ice caps (between −23.0 and −13.7 ‰) and the GrIS (between −29.9 and −23.2 ‰). This study demonstrates that water isotope analyses can be used to obtain important information on water sources and the subglacial drainage system structure that is highly desired for understanding glacier hydrology.

Citation: Yde, J. C., Knudsen, N. T., Steffensen, J. P., Carrivick, J. L., Hasholt, B., Ingeman-Nielsen, T., Kronborg, C., Larsen, N. K., Mernild, S. H., Oerter, H., Roberts, D. H., and Russell, A. J.: Stable oxygen isotope variability in two contrasting glacier river catchments in Greenland, Hydrol. Earth Syst. Sci., 20, 1197-1210, https://doi.org/10.5194/hess-20-1197-2016, 2016.
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