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CGG-02 Subglacial environments: Processes, sediments, landforms, modelling and experiments
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Investigating the potential for palaeo-climatic record in buried ice from the Dry Valleys, Antarctica
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Denis Samyn, Laboratoire de Glaciologie, Université Libre de Bruxelles (Belgium)
David Marchant, Boston University (United States)
Réginald Lorrain, Laboratoire de Glaciologie, Université Libre de Bruxelles (Belgium)
Jean-Louis Tison, Laboratoire de Glaciologie, Université Libre de Bruxelles (Belgium)
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Glaciers and ice sheets are sedimentary deposits that enclose paramount information for the understanding of past and current environments. Since a few decades, most of this information has been retrieved from deep polar ice cores, allowing deciphering crucial interactions between the various spheres of the global environment at the million-year scale. However, because firstly of the potential disturbance of environmental proxies in glacier ice cores by ice flow and basal processes, and secondly of the limited time cover spanned by such cores, there is a need to explore new types of glacial archives. The present work deals with buried glacier ice deposits from the Dry Valleys, Antarctica, that might represent new and potentially far-reaching archives of terrestrial atmosphere and climate.
We focus on grounded ice cores from four sites along a longitudinal transect in Mullins Valley, and discuss preliminary results of co-isotopic, gas content and crystallographical analyses. Various scenarii taking account of the local glaciological, geological and climatological context are explored to understand the formation of these buried glacier ice deposits and to evaluate their role as a potential environmental archive.
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