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Domack, Eugene W.; Jacobson, E. A.; Shipp, Stephanie; Anderson, John B.

doi:10.1130/0016-7606(1999)111<1517:lphrot>2.3.co;2

Cited by 272 publications

(25 citation statements)

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“…A continuous Holocene section from the Indian Ocean sector of the East Antarctic margin is desirable as it will provide a comparison to existing Pacific Ocean records, such as those from the Palmer Deep (Antarctic Peninsula-ODP Leg 178) and Ross Sea. In particular we note that modern East Antarctic margin climate is not strongly influenced by ENSO, as is the case for the Arctic Peninsula (Domack et al, 1993(Domack et al, , 2001(Domack et al, , 2003(Domack et al, , 2005Shevenell et al, 1996;Shevenell and Kennet, 2002;Leventer et al, 1996Leventer et al, , 2002Domack and Mayewski, 1999) and Ross Sea (Leventer and Dunbar, 1988;Leventer et al, 1993;Cunningham et al, 1999;Domack et al, 1999). Rather, this region responds to variability in the SAM, drainage from the East Antarctic ice sheet, and the relative strength of the polar easterlies.…”

Section: Ultrahigh Resolution Holocene Recordmentioning

confidence: 53%

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Cenozoic East Antarctic Ice Sheet Evolution from Wilkes Land Margin Sediments

Escutia¹,

Brinkhuis²,

Klaus³

2008

IODP Scientific Prospectus

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Section: Ultrahigh Resolution Holocene Recordmentioning

confidence: 53%

“…Drainage velocities in outlet glaciers range from >0.5 km/y to ~3.7 km/y ( Fig. F4) (Lindstrom and Tyler, 1984;MacDonald et al, 1989), whereas drainage in the areas between outlet glaciers, occupied by sea cliffs, may range from a few meters to tens of meters every year (Anderson, 1999).…”

Section: Background Physiographic and Geologic Settingmentioning

confidence: 99%

Cenozoic East Antarctic Ice Sheet Evolution from Wilkes Land Margin Sediments

Escutia¹,

Brinkhuis²,

Klaus³

2008

IODP Scientific Prospectus

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“…1a). During the peak of the LGM, sediment eroded from the Ross Sea catchment was transported in basal debris zones and deposited at the marine terminus of ice streams at either the outer shelf or upper slope 3–5 . As grounded ice retreated during the subsequent deglaciation, the paleo-ice-stream troughs were partly backfilled with trough-confined GZWs.…”

Section: Introductionmentioning

confidence: 99%

“…Sediment from shallow-penetration piston and kasten cores recovered from the Ross Sea continental shelf grade upwards from tills deposited by or in proximity to grounded ice to an overlying condensed section (a few tens of centimeters thickness) of post-glacial sediment deposited after the retreat of grounded ice 5 . Precisely dating ice sheet advance and retreat is challenging because the proximal glacial settings contain very little carbonate and total organic content is low 4, 5 .…”

Section: Introductionmentioning

confidence: 99%

The paradox of a long grounding during West Antarctic Ice Sheet retreat in Ross Sea

Bart

Krogmeier

Bart

et al. 2017

Sci Rep

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Marine geological data show that the West Antarctic Ice Sheet (WAIS) advanced to the eastern Ross Sea shelf edge during the Last Glacial Maximum (LGM) and eventually retreated ~1000 km to the current grounding-line position on the inner shelf. During the early deglacial, the WAIS deposited a voluminous stack of overlapping grounding zone wedges (GZWs) on the outer shelf of the Whales Deep Basin. The large sediment volume of the GZW cluster suggests that the grounding-line position of the paleo-Bindschadler Ice Stream was relatively stationary for a significant time interval. We used an upper bound estimate of paleo-sediment flux to investigate the lower bound duration over which the ice stream would have deposited sediment to account for the GZW volume. Our calculations show that the cluster represents more than three millennia of ice-stream sedimentation. This long duration grounding was probably facilitated by rapid GZW growth. The subsequent punctuated large-distance (~200 km) grounding-line retreat may have been a highly non-linear ice sheet response to relatively continuous external forcing such as gradual climate warming or sea-level rise. These findings indicate that reliable predictions of future WAIS retreat may require incorporation of realistic calculations of sediment erosion, transport and deposition.

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“…Available sampling indicates that the wedges in the Ross Sea are composed of diamicton, which can be distinguished from water-washed sub-iceshelf sediments (20), and that "Groundingzone wedges contain the sediment that was transported within the subglacial deforming till layer" (19).…”

mentioning

confidence: 99%

Discovery of Till Deposition at the Grounding Line of Whillans Ice Stream

Anandakrishnan

Catania

Alley

et al. 2007

Science

181

101

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We report on the discovery of a grounding-line sedimentary wedge ("till delta") deposited by Whillans Ice Stream, West Antarctica. Our observation is that grounding-line deposition serves to thicken the ice and stabilize the position of the grounding line. The ice thickness at the grounding line is greater than that of floating ice in hydrostatic equilibrium. Thus, the grounding line will tend to remain in the same location despite changes in sea level (until sea level rises enough to overcome the excess thickness that is due to the wedge). Further, our observation demonstrates the occurrence of rapid subglacial erosion, sediment transport by distributed subglacial till deformation, and grounding-line sedimentation, which have important implications for ice dynamics, numerical modeling of ice flow, and interpretation of the sedimentation record.

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Cited by 272 publications

References 0 publications

Cenozoic East Antarctic Ice Sheet Evolution from Wilkes Land Margin Sediments

Cenozoic East Antarctic Ice Sheet Evolution from Wilkes Land Margin Sediments

The paradox of a long grounding during West Antarctic Ice Sheet retreat in Ross Sea

Discovery of Till Deposition at the Grounding Line of Whillans Ice Stream

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