Reconstruction of changes in the Weddell Sea sector of the Antarctic Ice Sheet since the Last Glacial Maximum

Hillenbrand, Claus‐Dieter; Bentley, Michael J.; Stolldorf, Travis; Hein, Andrew S.; Kuhn, Gerhard; Graham, Alastair G C; Fogwill, Christopher J.; Kristoffersen, Yngve; Smith, James A; Anderson, John B.; Larter, Robert D; Melles, Martin; Hodgson, Dominic A.; Mulvaney, Robert; Sugden, David E.

doi:10.1016/j.quascirev.2013.07.020

Cited by 112 publications

(142 citation statements)

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“…Misfit M 5 : based on model-data mismatches for 20, 15, 10, and 5 ka. Data: RAISED Consortium (2014) Hillenbrand et al, 2014;Larter et al, 2014; …”

Section: Individual Data Types and Scoringmentioning

confidence: 99%

“…This uses reconstructed grounding-line maps for 20, 15, 10, and 5 ka by the RAISED Consortium (2014; Anderson et al, 2014;Hillenbrand et al, 2014;Larter et al, 2014;, with vertices provided by S. Jamieson, personal communication, 2015, and choosing their Scenario A for the Weddell embayment . The modern grounding line (0 ka) is derived from the Bedmap2 data set (Fretwell et al, 2013).…”

Section: B5 Gl2dmentioning

confidence: 99%

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Large ensemble modeling of the last deglacial retreat of the West Antarctic Ice Sheet: comparison of simple and advanced statistical techniques

et al. 2016

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Abstract.A 3-D hybrid ice-sheet model is applied to the last deglacial retreat of the West Antarctic Ice Sheet over the last ∼ 20 000 yr. A large ensemble of 625 model runs is used to calibrate the model to modern and geologic data, including reconstructed grounding lines, relative sea-level records, elevation-age data and uplift rates, with an aggregate score computed for each run that measures overall model-data misfit. Two types of statistical methods are used to analyze the large-ensemble results: simple averaging weighted by the aggregate score, and more advanced Bayesian techniques involving Gaussian process-based emulation and calibration, and Markov chain Monte Carlo. The analyses provide sea-level-rise envelopes with well-defined parametric uncertainty bounds, but the simple averaging method only provides robust results with full-factorial parameter sampling in the large ensemble. Results for best-fit parameter ranges and envelopes of equivalent sea-level rise with the simple averaging method agree well with the more advanced techniques. Best-fit parameter ranges confirm earlier values expected from prior model tuning, including large basal sliding coefficients on modern ocean beds.

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“…Misfit M 5 : based on model-data mismatches for 20, 15, 10, and 5 ka. Data: RAISED Consortium (2014) Hillenbrand et al, 2014;Larter et al, 2014; …”

Section: Individual Data Types and Scoringmentioning

confidence: 99%

Section: B5 Gl2dmentioning

confidence: 99%

Large ensemble modeling of the last deglacial retreat of the West Antarctic Ice Sheet: comparison of simple and advanced statistical techniques

et al. 2016

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“…The glacial history of the Filchner Trough is widely debated (Hillenbrand et al, 2013). In contrast, there is little knowledge about the glacial history of the Halley Trough; however, our new bathymetric data show arcuate escarpments, which may mark the limit of a till sheet, and a terminal moraine suggests that ice was grounded near to the shelf edge during previous glaciations.…”

Section: Past Glacial Historymentioning

confidence: 66%

Large-scale submarine landslides, channel and gully systems on the southern Weddell Sea margin, Antarctica

et al. 2014

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New multibeam bathymetric data from the southeastern Weddell Sea show significant differences in surface morphology of the outer continental shelf and slope between two adjacent cross-shelf troughs. These are the Filchner Trough and a smaller trough to the east we refer to as the 'Halley Trough'. Multibeam bathymetric data, acoustic sub-bottom profiler and seismic data show major differences in the incidence and morphologies of submarine gullies, channel systems, submarine slides and iceberg scours, and in sediment deposition.These large-scale differences suggest significant variation in slope and sedimentary processes and in the environmental setting between the two troughs, leading to much greater deposition at the mouth of the Filchner Trough. Bedforms, including a terminal moraine and scalloped embayments on the outer shelf of the Halley Trough provide insight into the relative timing and extent of past ice-sheet grounding and point to grounded ice near to the shelf edge during the Late Quaternary.The new data reveal two large-scale submarine slides on the upper slope of the eastern Crary Fan, a trough mouth fan offshore from the Filchner Trough. Both slides head at the shelf edge (~500 m water depth), with the largest slide measuring 20 km wide and with an incision depth of 60 m. Multibeam and seismic data show elongate slabs on the seafloor surface of the mid-slope. The lack of a discernible sedimentary cover suggests that they were generated after the Last Glacial Maximum (LGM). This is unusual because post-LGM submarine slides are very rare on the Antarctic continental margin, and to our knowledge, no other post-LGM slides have been documented on an Antarctic trough mouth fan. Because the slides occur on a part of the continental slope where the deposition of glacial debris was greatest, we speculate that weaker, unconsolidated sedimentary layers within the subsurface are important for slide initiation here.

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“…The MIS3 marine microfossils incorporated in the sediments of Albert and Dawson-Lambton Troughs, and elsewhere in the Weddell Sea (Hillenbrand et al, 2014) suggests widespread open water before the last main ice basins along the Coats Land ice margin. The streamlined landforms in bedrock, moraine complexes trending NNW from Albert Trough (Fig.…”

Section: Last Maximum Ice Advancementioning

confidence: 99%

“…Second, modelling of palaeo-ice thicknesses in Coats Land based on ice core data suggests initial thinning from the LGM followed by rethickening over the last 5 ka . Third, marine geological data suggest a major advance of grounded ice from Coats Land towards the continental shelf break in the Weddell Sea; however, there is limited 10 empirical evidence on the timing and nature of the subsequent retreat (Hillenbrand et al, 2014;.…”

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confidence: 99%

Deglaciation and future stability of the Coats Land ice margin, Antarctica

Hodgson¹,

Hogan²,

Smith³

et al. 2018

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Abstract. The East Antarctic Ice Sheet discharges into the Weddell Sea via the Coats Land ice margin. We have used geophysical data to determine the changing ice sheet configuration in this region through its last advance and retreat, and identify constraints on its future stability. Methods included high-resolution multibeambathymetry, sub-bottom profiles, seismic-reflection profiles, sediment core analysis and satellite altimetry. 15These provide evidence that Coats Land glaciers and ice streams merged with the palaeo-Filchner Ice Stream during the last ice advance. Retreat of this ice stream from 12.8 to 8.4 cal kyr BP resulted in its progressive southwards decoupling from Coats Land glaciers. Moraines and grounding-zone wedges document the subsequent retreat and thinning of these glaciers, loss of contact with the bed, and the formation of ice shelves, which re-advanced to pinning points on topographic highs at the distal end of their troughs. Once detached from 20 the bed, the ice shelves were predisposed to rapid retreat back to coastal grounding lines due to reverse-bed slopes, the absence of further pinning points, and potentially to the loss of structural integrity propagating from the grounding line. These processes explain why there are no large ice shelves from 75.5-77°S.

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Reconstruction of changes in the Weddell Sea sector of the Antarctic Ice Sheet since the Last Glacial Maximum

Cited by 112 publications

References 130 publications

Large ensemble modeling of the last deglacial retreat of the West Antarctic Ice Sheet: comparison of simple and advanced statistical techniques

Large ensemble modeling of the last deglacial retreat of the West Antarctic Ice Sheet: comparison of simple and advanced statistical techniques

Large-scale submarine landslides, channel and gully systems on the southern Weddell Sea margin, Antarctica

Deglaciation and future stability of the Coats Land ice margin, Antarctica

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