Chemical and isotopic characteristics of a glacier-derived naled in front of Austre Grønfjordbreen, Svalbard

J.C. Yde, A.J. Hodson, I. Solovjanova, J.P. Steffensen, P. Nørnberg, J. Heinemeier, J. Olsen

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisTidsskriftartikelForskningpeer review

Abstract

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.
OriginalsprogEngelsk
TidsskriftPolar Research
Vol/bind31
Antal sider15
ISSN0800-0395
DOI
StatusUdgivet - 27 mar. 2012

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  • Mars Simulation Laboratory

    Nørnberg, P. (PI)

    Projekter: ProjektRådgivende projekt

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