Chemical and isotopic characteristics of a glacier-derived naled in front of Austre Grønfjordbreen, Svalbard
The chemical and stable isotope composition of a glacier-derived naled in front of the glacier Austre Grønfjordbreen, Svalbard, is examined to elucidate how secondary processes such as preferential retention and leaching affect naled chemistry. Internal candle ice layers have a chemical composition...
| Published in: | Polar Research |
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| Main Authors: | , , , , , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
2012
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| Subjects: | |
| Online Access: | https://pure.au.dk/portal/en/publications/079ecfb0-9abd-4735-96a0-a6f52d9e76f1 https://doi.org/10.3402/polar.v31i0.17628 http://www.scopus.com/inward/record.url?scp=84863736482&partnerID=8YFLogxK |
| Summary: | The chemical and stable isotope composition of a glacier-derived naled in front of the glacier Austre Grønfjordbreen, Svalbard, is examined to elucidate how secondary processes such as preferential retention and leaching affect naled chemistry. Internal candle ice layers have a chemical composition almost similar to that of the lower stratified granular ice layer, whereas the upper granular ice layer has a significantly different composition, which resembles the composition found in glacier meltwater. Grey, platy cryogenic calcite precipitates are found in clusters on the surface of the naled assemblage, indicating preferential retention of Ca and HCO . This process is particular pronounced in the distal part of the naled. The isotopic composition in the naled is in accordance with the local meteoric water line and without indications of kinetic fractionation during freezing. The ability to form icemarginal naled indicates that Austre Grønfjordbreen has the high meltwater storage potential required for triggering a glacier surge event. Polar Research 2012. |
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