Reconstruction of the West Antarctic ice sheet in Pine Island Bay during the Last Glacial Maximum and its subsequent retreat history

Lowe, Ashley L; Anderson, John B.

doi:10.1016/s0277-3791(02)00006-9

Cited by 198 publications

(260 citation statements)

References 49 publications

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“…However, Lowe and Anderson (2002) and Uenzelmann-Neben et al (2007) published seismic profiles from the eastern ASE, which show northward-dipping strata continuing beneath the outer shelf, where they are unconformably overlain by more gently dipping to flat-lying strata that continue to the shelf edge. These relatively flat-lying strata covering the outer shelf have probably accumulated during the period over which the ice sheet grounding line has periodically advanced across the continental shelf.…”

Section: Substratementioning

confidence: 99%

“…These relatively flat-lying strata covering the outer shelf have probably accumulated during the period over which the ice sheet grounding line has periodically advanced across the continental shelf. (Larter et al, 1997;Nitsche et al, 2000;Lowe and Anderson, 2002).…”

Section: Substratementioning

confidence: 99%

“…5D and S2) and locally feed into streamlined grooves located alongside of drumlin tails. Such overdeepenings likely result from pressure melting, focussed glacial scouring, or meltwater erosion at the heads of glacial landforms (Lowe and Anderson, 2002;Wellner et al, 2006). Large, isolated bedrock highs, 100's of metres high, also occur throughout the central spine of the Getz A basin (e.g., Figs.…”

Section: Getz a Troughmentioning

confidence: 99%

“…Previous work on palaeo-ice flow in the ASE using marine geophysical data showed bedform evidence for former ice stream flows toward the shelf edge at the LGM (Wellner et al, 2001;Lowe and Anderson, 2002;Evans et al, 2006;Larter et al, 2009). In the eastern ASE, Anderson (2002, 2003) distinguished a series of discrete geomorphic zones along one particular palaeoice stream track.…”

Section: Introductionmentioning

confidence: 96%

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Bedform signature of a West Antarctic palaeo-ice stream reveals a multi-temporal record of flow and substrate control

Graham

Larter

Gohl

et al. 2009

Quaternary Science Reviews

174

173

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a b s t r a c tThe presence of a complex bedform arrangement on the sea floor of the continental shelf in the western Amundsen Sea Embayment, West Antarctica, indicates a multi-temporal record of flow related to the activity of one or more ice streams in the past. Mapping and division of the bedforms into distinct landform assemblages reveals their time-transgressive history, which implies that bedforms can neither be considered part of a single downflow continuum nor a direct proxy for palaeo-ice velocity, as suggested previously. A main control on the bedform imprint is the geology of the shelf, which is divided broadly between rough bedrock on the inner shelf, and smooth, dipping sedimentary strata on the middle to outer shelf. Inner shelf bedform variability is well preserved, revealing information about local, complex basal ice conditions, meltwater flow, and ice dynamics over time. These details, which are not apparent at the scale of regional morphological studies, indicate that past ice streams flowed across the entire shelf at times, and often had onset zones that lay within the interior of the Antarctic Ice Sheet today. In contrast, highly elongated subglacial bedforms on sedimentary strata of the middle to outer shelf represent a timeslice snapshot of the last activity of ice stream flow, and may be a truer representation of fast palaeo-ice flow in these locations. A revised model for ice streams on the shelf captures complicated multi-temporal bedform patterns associated with an Antarctic palaeo-ice stream for the first time, and confirms a strong substrate control on a major ice stream system that drained the West Antarctic Ice Sheet during the Late Quaternary.

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Section: Substratementioning

confidence: 99%

Section: Substratementioning

confidence: 99%

Section: Getz a Troughmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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Bedform signature of a West Antarctic palaeo-ice stream reveals a multi-temporal record of flow and substrate control

Graham

Larter

Gohl

et al. 2009

Quaternary Science Reviews

174

173

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“…These regions include similar geomorphic and stratigraphic features. Although we do not include them in the discussion below due to space considerations, we include here representative citations to some of the studies published for the Bellingshausen and Amundsen seas Tucholke and Houtz, 1976;Tucholke, 1977;Kimura, 1982;Yamaguchi et al, 1988;Cunningham et al, 1994Cunningham et al, , 2002Gohl et al, 1997Gohl et al, , 2007Nitsche et al, 1997Nitsche et al, , 2000Wellner et al, 2001Wellner et al, , 2006Lowe and Anderson, 2002;Ó Cofaigh et al, 2005;Dowdeswell et al, 2006;Evans et al, 2006;Scheuer et al, 2006a, b;Larter et al, 2007;Uenzelmann-Neben et al, 2007) and for offshore areas of Queen Maud Land and Enderby Land (Kuvaas et al, 2004a(Kuvaas et al, , b, 2005Hinz et al, 2005;Stagg et al, 2004a, b;Leitchenkov et al, 2007;Solli et al, 2007a, b, c).…”

Section: Other Sectors Of the Antarctic Continental Marginmentioning

confidence: 99%

Chapter 5 Cenozoic Climate History from Seismic Reflection and Drilling Studies on the Antarctic Continental Margin

Cooper

Brancolini

Escutia

et al. 2008

Antarctic Climate Evolution

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A new bathymetric compilation for the South Orkney Islands region, Antarctic Peninsula (49°–39°W to 64°–59°S): Insights into the glacial development of the continental shelf

Dickens

Graham

Smith

et al. 2014

Geochem Geophys Geosyst

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We present a new, high resolution (300 m) bathymetric grid of the continental shelf surrounding the South Orkney Islands, northeast of the Antarctic Peninsula. The new grid, derived from a compilation of marine echo‐sounding data, improves previous regional bathymetric representations and helps to visualize the morphology of the shelf in unrivalled detail. The compilation forms important baseline information for a range of scientific applications and end users including oceanographers, glacial modelers, biologists, and geologists. In particular, due to the limited understanding of glacial history in this region, the bathymetry provides the first detailed insights into past glacial regimes. The continental shelf is dominated by seven glacially eroded troughs, marking the pathways of glacial outlets that once drained a former ice cap centered on the South Orkney Islands. During previous glacial periods, grounded ice extended to the shelf edge north of the islands. A large, ∼250 km long sediment depocenter, interpreted as a maximum former ice limit of one or more Cenozoic glaciations, suggests that ice was only grounded to the ∼300–350 m contour in the south. Hypsometric analyses support this interpretation, indicating that a significant proportion of the shelf has been unaffected by glacial erosion. Using these observations, we propose a preliminary ice cap reconstruction for maximum glaciation of the South Orkney plateau, suggesting an ice coverage of about ∼19,000 km2. The timing of maximum ice extent, number of past advances and pattern of subsequent deglaciation(s) remain uncertain and will require further targeted marine geological and geophysical investigations to resolve.

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Reconstruction of the West Antarctic ice sheet in Pine Island Bay during the Last Glacial Maximum and its subsequent retreat history

Cited by 198 publications

References 49 publications

Bedform signature of a West Antarctic palaeo-ice stream reveals a multi-temporal record of flow and substrate control

Bedform signature of a West Antarctic palaeo-ice stream reveals a multi-temporal record of flow and substrate control

Chapter 5 Cenozoic Climate History from Seismic Reflection and Drilling Studies on the Antarctic Continental Margin

A new bathymetric compilation for the South Orkney Islands region, Antarctic Peninsula (49°–39°W to 64°–59°S): Insights into the glacial development of the continental shelf

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