Spatiotemporal variability of oxygen isotope compositions in three contrasting glacier river catchments in Greenland
Analysis of stable oxygen isotope (δ 18 O) characteristics is a useful tool to investigate water provenance in glacier river systems. In order to attain knowledge on the diversity of spatio-temporal δ 18 O variations in glacier rivers, we have examined three glacierized catchments in Greenland with...
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ftunivnewcastle:oai:eprint.ncl.ac.uk:215859 2023-05-15T16:20:51+02:00 Spatiotemporal variability of oxygen isotope compositions in three contrasting glacier river catchments in Greenland Yde JC Knudsen NT Steffensen JP Carrivick JL Hasholt B Ingeman-Nielsen T Kronborg C Larsen NK Mernild SH Oerter H Roberts DH Russell AJ application/pdf https://eprint.ncl.ac.uk/fulltext.aspx?url=215859/6E993EBB-7102-4746-BE97-BEEF106E2102.pdf&pub_id=215859 unknown Copernicus GmbH Hyrdology and Earth System Sciences Article ftunivnewcastle 2020-06-11T23:28:16Z Analysis of stable oxygen isotope (δ 18 O) characteristics is a useful tool to investigate water provenance in glacier river systems. In order to attain knowledge on the diversity of spatio-temporal δ 18 O variations in glacier rivers, we have examined three glacierized catchments in Greenland with different areas, glacier hydrology and thermal regimes. At Mittivakkat Gletscher River, a small river draining a local temperate glacier in southeast Greenland, diurnal oscillations in δ 18 O occur with a three-hour time lag to the diurnal oscillations in runoff. Throughout the peak flow season the δ 18 O composition is controlled by the proportion between snowmelt and ice melt with episodic inputs of rainwater and occasional storage and release of a specific water component due to changes in the subglacial drainage system. At Kuannersuit Glacier River on the island Qeqertarsuaq, the δ 18 O characteristics were examined after the major 1995–1998 glacier surge event. Despite large variations in the δ 18 O 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 2000–2001. In 2002 there were indications of diurnal oscillations, and in 2003 there were large diurnal fluctuations in δ 18 O. At Watson River, a large catchment at the western margin of the Greenland Ice Sheet, the spatial distribution of δ 18 O in the river system was applied to fingerprint the relative runoff contributions from sub-catchments. Spot sampling indicates that during the early melt season most of the river water (64–73 %) derived from the Qinnguata Kuussua tributary, whereas the water flow on 23 July 2009 was dominated by bulk meltwater from the Akuliarusiarsuup Kuua tributary (where 7 and 67 % originated from the Russell Glacier and Leverett Glacier sub-catchments, respectively). A comparison of the δ 18 O compositions from glacial river water in Greenland shows distinct differences between water draining local glaciers (between −17.4 and −13.7 ‰), large ice caps (between −23.0 and −17.8 ‰) and the Greenland Ice Sheet (between −29.9 and −23.2 ‰). Article in Journal/Newspaper glacier Greenland Ice Sheet Leverett Glacier Qeqertarsuaq Newcastle University Library ePrints Service Greenland Leverett Glacier ENVELOPE(-147.583,-147.583,-85.633,-85.633) Qeqertarsuaq ENVELOPE(-56.867,-56.867,74.400,74.400) |
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Newcastle University Library ePrints Service |
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ftunivnewcastle |
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unknown |
description |
Analysis of stable oxygen isotope (δ 18 O) characteristics is a useful tool to investigate water provenance in glacier river systems. In order to attain knowledge on the diversity of spatio-temporal δ 18 O variations in glacier rivers, we have examined three glacierized catchments in Greenland with different areas, glacier hydrology and thermal regimes. At Mittivakkat Gletscher River, a small river draining a local temperate glacier in southeast Greenland, diurnal oscillations in δ 18 O occur with a three-hour time lag to the diurnal oscillations in runoff. Throughout the peak flow season the δ 18 O composition is controlled by the proportion between snowmelt and ice melt with episodic inputs of rainwater and occasional storage and release of a specific water component due to changes in the subglacial drainage system. At Kuannersuit Glacier River on the island Qeqertarsuaq, the δ 18 O characteristics were examined after the major 1995–1998 glacier surge event. Despite large variations in the δ 18 O 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 2000–2001. In 2002 there were indications of diurnal oscillations, and in 2003 there were large diurnal fluctuations in δ 18 O. At Watson River, a large catchment at the western margin of the Greenland Ice Sheet, the spatial distribution of δ 18 O in the river system was applied to fingerprint the relative runoff contributions from sub-catchments. Spot sampling indicates that during the early melt season most of the river water (64–73 %) derived from the Qinnguata Kuussua tributary, whereas the water flow on 23 July 2009 was dominated by bulk meltwater from the Akuliarusiarsuup Kuua tributary (where 7 and 67 % originated from the Russell Glacier and Leverett Glacier sub-catchments, respectively). A comparison of the δ 18 O compositions from glacial river water in Greenland shows distinct differences between water draining local glaciers (between −17.4 and −13.7 ‰), large ice caps (between −23.0 and −17.8 ‰) and the Greenland Ice Sheet (between −29.9 and −23.2 ‰). |
format |
Article in Journal/Newspaper |
author |
Yde JC Knudsen NT Steffensen JP Carrivick JL Hasholt B Ingeman-Nielsen T Kronborg C Larsen NK Mernild SH Oerter H Roberts DH Russell AJ |
spellingShingle |
Yde JC Knudsen NT Steffensen JP Carrivick JL Hasholt B Ingeman-Nielsen T Kronborg C Larsen NK Mernild SH Oerter H Roberts DH Russell AJ Spatiotemporal variability of oxygen isotope compositions in three contrasting glacier river catchments in Greenland |
author_facet |
Yde JC Knudsen NT Steffensen JP Carrivick JL Hasholt B Ingeman-Nielsen T Kronborg C Larsen NK Mernild SH Oerter H Roberts DH Russell AJ |
author_sort |
Yde JC |
title |
Spatiotemporal variability of oxygen isotope compositions in three contrasting glacier river catchments in Greenland |
title_short |
Spatiotemporal variability of oxygen isotope compositions in three contrasting glacier river catchments in Greenland |
title_full |
Spatiotemporal variability of oxygen isotope compositions in three contrasting glacier river catchments in Greenland |
title_fullStr |
Spatiotemporal variability of oxygen isotope compositions in three contrasting glacier river catchments in Greenland |
title_full_unstemmed |
Spatiotemporal variability of oxygen isotope compositions in three contrasting glacier river catchments in Greenland |
title_sort |
spatiotemporal variability of oxygen isotope compositions in three contrasting glacier river catchments in greenland |
publisher |
Copernicus GmbH |
url |
https://eprint.ncl.ac.uk/fulltext.aspx?url=215859/6E993EBB-7102-4746-BE97-BEEF106E2102.pdf&pub_id=215859 |
long_lat |
ENVELOPE(-147.583,-147.583,-85.633,-85.633) ENVELOPE(-56.867,-56.867,74.400,74.400) |
geographic |
Greenland Leverett Glacier Qeqertarsuaq |
geographic_facet |
Greenland Leverett Glacier Qeqertarsuaq |
genre |
glacier Greenland Ice Sheet Leverett Glacier Qeqertarsuaq |
genre_facet |
glacier Greenland Ice Sheet Leverett Glacier Qeqertarsuaq |
op_source |
Hyrdology and Earth System Sciences |
_version_ |
1766008867089547264 |