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Modelling the past evolution of the East Antarctic Ice Sheet (EAIS) in response to climateand ocean forcing is challenged by the scarcity of observed palaeo boundary conditions. Oneof the most spatially extensive records of past ice-sheet conditions comes from radar-detectedisochrones which, if dated precisely at ice cores, can provide a highly accurate temporal andspatial history of ice-sheet evolution over time. Previous work has highlighted the benefit ofusing such isochrones for testing and benchmarking 3-D ice sheet models; however, uncertainty remains as to which model parameters fare better and how different bed and ice-flow conditions affect the ability of ice-sheet models to reproduce the observed isochrones. Here, we make use of previously acquired airborne radar data over the Wilkes SubglacialBasin (East Antarctica) to connect existing stratigraphies and extract a temporal record ofisochrones at regular time intervals spanning the Holocene to the last interglacial and beyond.The radar flight lines were carefully selected to provide a record of isochrones crossingboundaries of different bed and ice-flow conditions situated between the ice divide and theice-sheet margins to represent as diverse a set of conditions as possible. The aim of this workis to ultimately be able to test the ability of dated isochrones to tune ice-sheet modelparameters that will reproduce isochrone elevations in different parts of the catchment andunder different bed and ice-flow conditions.
Bodart et al. (Mon,) studied this question.
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