Grounding-line retreat of the West Antarctic Ice Sheet from inner Pine Island Bay

Hillenbrand, Claus‐Dieter; Kuhn, Gerhard; Smith, James A; Gohl, Karsten; Graham, Alastair G C; Larter, Robert D; Klages, Johann Philipp; Downey, Rachel; Moreton, Steven G.; Forwick, Matthias; Vaughan, David G.

doi:10.1130/g33469.1

Cited by 112 publications

(124 citation statements)

References 24 publications

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“…The early Holocene inland-retreat rates also agree with those derived offshore from the marine record. Smith et al (2011) documented open-water conditions at 11.4 ka cal yrs BP (or 11.8 ka as recalculated by Hillenbrand et al, 2013) and showed that the front of the Dotson Ice Shelf retreated about 50 km since 13.8 ka, reaching close to its modern position during the early Fig. 4.…”

Section: Discussionmentioning

confidence: 99%

“…A potential early Holocene retreat history is mainly supported by the similarity to the regional pattern of glacial retreat derived from several offshore studies in Pine Island Bay (e.g. Hillenbrand et al, 2013;Larter et al, 2014).…”

Section: Pine Island Bay: Nuclide Inheritance Vs Isostatic Reboundmentioning

confidence: 99%

“…10 Be surface exposure ages by Johnson et al (2008) are shown as green diamonds. Published minimum ages for grounding-line retreat (Smith et al, 2011;Hillenbrand et al, 2013) are indicated by orange diamonds. The modern grounding-line (black continuous line) and regional bathymetry data are from Rignot et al (2011) and Nitsche et al (2007), bathymetry grading adopted from Smith et al (2011).…”

Section: The West Antarctic Ice Sheetmentioning

confidence: 99%

“…The Kohler Range samples show such an inverted age-elevation relationship, with the lower (and more coastal) sample yielding an older age. Taking into account a minimum age for grounding-line retreat from the Dotson Ice Shelf front (11.8 ka, Hillenbrand et al, 2013, Fig. 1), we hypothesize that the cosmogenic age pattern in the Kohler Range can be utilized to estimate a paleo-grounding-line position for this location.…”

Section: Kohler Range: Simple Ice-sheet Modelingmentioning

confidence: 99%

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Glacial retreat in the Amundsen Sea sector, West Antarctica – first cosmogenic evidence from central Pine Island Bay and the Kohler Range

Lindow

Castex

Wittmann

et al. 2014

Quaternary Science Reviews

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a b s t r a c tThe Amundsen Sea Embayment of West Antarctica hosts one of the most rapidly changing sectors of the West Antarctic Ice Sheet. With the fastest-flowing ice streams in Antarctica, the region around Pine Island Bay is characterized by rapid ice-sheet thinning and grounding-line retreat. Published surfaceexposure data are limited to a few isolated nunataks making it difficult to assess the long-term deglacial history of the area. To address this, we correlate existing records of lateral ice-stream retreat from marine sediment cores with onshore glacial thinning in two key areas of eastern Marie Byrd Land: the Kohler Range and Pine Island Bay. Our 10 Be surface-exposure ages are the first from the isolated Kohler Range and show that the nunataks there became ice-free between 8.6 and 12.6 ka. This implies a minimum long-term average thinning rate of 3.3 ± 0.3 cm/yr, which is one order of magnitude lower than recent rates based on satellite data. We also present pre-to early Holocene 10 Be surface-exposure ages from two islands located approximately 80 km downstream of the Pine Island Glacier ice-shelf front to constrain the lateral deglacial history in the Pine Island Bay area. This study provides insight into the significance of local ice sheet variations and suggests that the post-LGM history in the Amundsen Sea sector was characterized by glacial thinning as well as lateral retreat in pre-to early Holocene times.

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Section: Discussionmentioning

confidence: 99%

Section: Pine Island Bay: Nuclide Inheritance Vs Isostatic Reboundmentioning

confidence: 99%

Section: The West Antarctic Ice Sheetmentioning

confidence: 99%

Section: Kohler Range: Simple Ice-sheet Modelingmentioning

confidence: 99%

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Glacial retreat in the Amundsen Sea sector, West Antarctica – first cosmogenic evidence from central Pine Island Bay and the Kohler Range

Lindow

Castex

Wittmann

et al. 2014

Quaternary Science Reviews

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show abstract

“…They calculated ice sheet elevations consistent with quasi-steady grounding line positions, concluding that the Weddell Sea grounding-line did not advance to the continental shelf edge at the LGM. However, Hillenbrand et al (2013) concluded that, on the basis of marine geological evidence, the grounding line extended to the continental shelf margin, possibly only briefly. More systematic views of matching data with models are provided by Whitehouse et al (2012) and by .…”

mentioning

confidence: 99%

On the reconstruction of palaeo-ice sheets: Recent advances and future challenges

Stokes

Tarasov

Blomdin

et al. 2015

Quaternary Science Reviews

151

104

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Airborne radar sounding evidence for deformable sediments and outcropping bedrock beneath Thwaites Glacier, West Antarctica

Schroeder

Blankenship

Young

et al. 2014

Geophysical Research Letters

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The geologic and morphologic records of prior ice sheet configurations show evidence of rapid, back-stepping, meltwater intensive retreats. However, the potential for such a retreat in a contemporary glacier depends on the lithology of the current ice sheet bed, which lies beneath kilometers of ice, making its physical properties difficult to constrain. We use radar sounding and marine bathymetry data to compare the bed configuration of Thwaites Glacier to the bed of paleo-Pine Island Glacier. Using observed and modeled radar scattering, we show that the tributaries and upper trunk of Thwaites Glacier are underlain by ice flow-aligned bedforms consistent with deformable sediment and that the lower trunk is grounded on a region of high bed roughness consistent with outcropping bedrock. This is the same configuration as paleo-Pine Island Glacier during its retreat across the inner continental shelf.

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Grounding-line retreat of the West Antarctic Ice Sheet from inner Pine Island Bay

Cited by 112 publications

References 24 publications

Glacial retreat in the Amundsen Sea sector, West Antarctica – first cosmogenic evidence from central Pine Island Bay and the Kohler Range

Glacial retreat in the Amundsen Sea sector, West Antarctica – first cosmogenic evidence from central Pine Island Bay and the Kohler Range

On the reconstruction of palaeo-ice sheets: Recent advances and future challenges

Airborne radar sounding evidence for deformable sediments and outcropping bedrock beneath Thwaites Glacier, West Antarctica

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