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Ritz Catherine, Hugh Corr, Fred Parrenin, Duncan Young, Jason Roberts, Olivier Passalacqua, Rob Mulvaney, Massimo Frezzotti, Luca Vittuari and others from the DC survey group |
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Oldest Ice reconnaissance in the vicinity of Concordia. Plans for a collaborative data-modelling approach |
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Conference - International - Communication |
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2016 |
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Recovering a 1.5 million years record of climate and greenhouse gases from Antarctica is a major objective of the ice core community and there is an agreement that such "Oldest Ice" could be found in the plateau area of the East Antarctic Ice Sheet. The region around the permanent station of Concordia (East Antarctica) is among the few possible spots. In the framework of IPICS, it was decided to have a consortium to work on the reconnaissance for Oldest Ice in the region of Dome C. We present here the field measurements that are planned or already going on and how we plan to associate heterogenous observations and ice flow/thermal modelling to infer optimal location. The key issue for retrieving very old ice in central regions is to avoid zones with basal melting at the ice bed interface because this process removes basal layers. Modelling approach is a tool to make predictions about the thermal type of ice-bed interface as well as chronology of the deep layers, however it is limited by the badly known geothermal heat flux value and this approach has to be combined with field observations. The measurements we are considering are radar measurements (airborne, ground based, and pRES), relatively shallow drillings to measure temperature vertical profile and strain net survey. |
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yes |
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6503 |
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