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• W2182955151 abstract "BACKGROUND ANDRILL and earlier (Cape Roberts, CIROS 1 and 2) coring in the Ross Sea region of Antarctica (Barrett, 2009, Naish et al 2002, 2009), and associated ice sheet modelling (DeConto and Pollard 2003, Pollard and DeConto, 2009) have demonstrated East and West Antarctic ice sheet variability on orbital timescales since ice sheet inception at the Eocene/Oligocene boundary at around 35 Ma. Of direct societal relevance, interpretation of the ANDRILL 1B core suggests that repeated collapses of the West Antarctic Ice Sheet (WAIS) have occurred in the last 5 Ma, in both the Pliocene and during Pleistocene ‘super’ interglacials when temperatures and CO2 levels were slightly higher than today (Naish et al. 2009, Pollard and DeConto 2009). In apparent conflict with these findings, moraine dating, survival of extreme polar desert landforms, ancient buried ice, and extinction of local temperate biota in the adjacent Dry Valleys region indicate stability of the East Antarctic Ice Sheet since the mid Miocene (the last 13 ma) (Sugden et al. 1995, Sugden and Denton 2004, Lewis et al. 2008). At present, it is not possible to discriminate between these seemingly divergent hypotheses, nor assess whether they are compatible, because the interpretation of geological evidence (both cores and onshore geomorphology) involve substantial extrapolation in both space and time, and ice sheet modelling lacks the appropriate spatial resolution for direct comparison to field evidence. As a consequence of these and other uncertainties, numerical modelling and empirical reconstructions differ vastly in their interpretation of the former ice volumes which resulted from temperatures slightly warmer than today (c.f. Hill et al., 2007; Pollard & DeConto, 2009). The extent to which East Antarctic Ice Sheet (EAIS) outlet glaciers changed during such ice-sheet reconfiguration(s) is central to this uncertainty (Sugden 1996; Hall et al., 1997; Sugden & Denton 2004), and remains keenly debated, with evidence from the Dry Valleys region suggesting minor Pliocene ice advances (Marchant et al. 1993), whereas temperate glacier deposits of presumed but disputed Pliocene age (McKay 2008) adjacent to the Beardmore and Shackleton Glaciers at >80oS, may indicate conditions substantially warmer than present (Mercer 1972, Hambrey et al. 2003)." @default.
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• W2182955151 date "2009-01-01" @default.
• W2182955151 modified "2023-09-27" @default.
• W2182955151 title "ICE-SHEET MODELLING CONTRIBUTION TO ANDRILL PROGRAMME" @default.
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