Past Antarctic ice sheet dynamics (PAIS) and implications for future sea-level change

Colleoni, Florence; Santis, Laura De; Naish, T.; DeConto, Robert M.; Escutia, Carlota; Stocchi, Paolo; Uenzelmann-Neben, Gabriele; Hochmuth, Katharina; Hillenbrand, Claus‐Dieter; Flierdt, Tina van de; Pérez, Lara F.; Leitchenkov, G. L.; Sangiorgi, Francesca; Jamieson, Stewart S. R.; Bentley, Michael J.; Wilson, David J.

doi:10.1016/b978-0-12-819109-5.00010-4

Cited by 8 publications

(7 citation statements)

References 446 publications

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“…The three scenarios above are consistent with the geological history of the region and all imply the surfaces were likely formed prior to the onset of major Antarctic glaciation at 34 Ma (Colleoni et al, 2022). The likelihood of each scenario is difficult to constrain, as there is limited evidence to reinforce et al (2015) as they could be too distal.…”

Section: Hypothesis 2: West Antarctic Rift Systemmentioning

confidence: 52%

“…However, a continental-scale Antarctic Ice Sheet with frequent calving at the coastline was not formed until ca. 32.8 Ma, coincident with the earliest time at which atmospheric CO2 fell below approximately 600ppm (Colleoni et al, 2022;Galeotti et al, 2016). The threshold of atmospheric CO2 for the onset of large-scale Antarctic glaciation remains uncertain, with values in numerical climate and ice sheet simulations varying between 560 to 900ppm (Colleoni et al, 2022).…”

Section: Climate and Ice Sheet History Of Antarcticamentioning

confidence: 91%

“…At this time, >50 m changes in global mean sea level records were observed, derived from Pacific benthic foraminiferal δ 18 O and Mg/Ca records (Miller et al, 2020), implying large fluctuations in Antarctic ice sheet volume. The declining Cenozoic atmospheric CO2 and Southern Ocean cooling as a result of the opening of ocean gateways led to the formation of small, highly dynamic ice caps on high Antarctic plateaux at the Eocene-Oligocene transition (Colleoni et al, 2022;DeConto and Pollard, 2003). However, a continental-scale Antarctic Ice Sheet with frequent calving at the coastline was not formed until ca.…”

Section: Climate and Ice Sheet History Of Antarcticamentioning

confidence: 99%

“…The timing of the trough formation is likely to coincide with the inception of the West Antarctic Ice Sheet at 14 to 12 Ma, (Colleoni et al, 2022) as troughs of this magnitude would require a large ice sheet reaching extents close to the shelf edge in order to achieve the depth and magnitude of erosion shown.…”

Section: Glacial Erosion Of Troughsmentioning

confidence: 99%

“…Alpine glaciation likely took place at the early stages of Antarctic glaciation at the Eocene-Oligocene boundary at 34 Ma (DeConto and Pollard, 2003). Glacial erosion of the troughs occurred post-planation of the surfaces and coincided with the inception of the West Antarctic Ice Sheet at 14-12 Ma (Colleoni et al, 2022).…”

Section: Formational Processesmentioning

confidence: 99%

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Subglacial topography and landscape evolution from radio-echo sounding data in the Evans-Rutford Region, southern Antarctic Peninsula.

Carter¹,

Bentley²,

Jamieson³

et al. 2022

Preprint

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<p>Understanding the subglacial bed topography of the Antarctic ice sheet is important for the boundary conditions of ice sheet modelling and the assessment of basal hydrological conditions. Moreover, inferring landscape evolution from the geomorphology can also provide insight into ice sheet inception and history. We utilise radio-echo sounding data from the BAS GRADES-IMAGE and TORUS radar surveys to geomorphologically interpret the bed topography in the Evans-Rutford Region of Antarctica, between the Ellsworth mountains and the southern Antarctic Peninsula. The GRADES-IMAGE survey is a legacy radar survey that has not yet been examined in detail in terms of subglacial bed topography and consists of 11,500 line kilometres of data along 22 lines. We have updated the subglacial bed picks to develop a new Digital Elevation Model of the region. Here we report preliminary results of the mapped subglacial landscape, with potential interpretations of the topographic patterns and landscape evolution. Geomorphological observations of the key features include identification of flat plateau surfaces at similar elevations, sitting between deep incised glacial troughs, some of which have potential tectonic controls.</p>

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Section: Hypothesis 2: West Antarctic Rift Systemmentioning

confidence: 52%

Section: Climate and Ice Sheet History Of Antarcticamentioning

confidence: 91%