Inland thinning of West Antarctic Ice Sheet steered along subglacial rifts

Robert George Bingham, Fausto Ferraccioli, Edward C. King, Robert D. Larter, Hamish D. Pritchard, Andrew M. Smith, David G. Vaughan

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

Current ice loss from the West Antarctic Ice Sheet (WAIS) accounts for about ten per cent of observed global sea-level rise. Losses are dominated by dynamic thinning, in which forcings by oceanic or atmospheric perturbations to the ice margin lead to an accelerated thinning of ice along the coastline2. Although central to improving projections of future ice-sheet contributions to global
sea-level rise, the incorporation of dynamic thinning into models has been restricted by lack of knowledge of basal topography and subglacial geology so that the rate and ultimate extent of potential WAIS retreat remains difficult to quantify. Here we report the discovery of a subglacial basin under Ferrigno Ice Stream up to 1.5 kilometres deep that connects the ice-sheet interior to the
Bellingshausen Sea margin, and whose existence profoundly affects ice loss. We use a suite of ice-penetrating radar, magnetic and gravity measurements to propose a rift origin for the basin in association with the wider development of the West Antarctic rift system. The Ferrigno rift, overdeepened by glacial erosion, is a conduit which fed a major palaeo-ice stream on the adjacent continental shelf during glacial maxima. The palaeo-ice stream, in turn, eroded the ‘Belgica’ trough, which today routes warm openocean water back to the ice front to reinforce dynamic thinning.We show that dynamic thinning from both the Bellingshausen and Amundsen Sea region is being steered back to the ice-sheet interior along rift basins. We conclude that rift basins that cut across the
WAIS margin can rapidly transmit coastally perturbed change inland, thereby promoting ice-sheet instability.
Original languageEnglish
Pages (from-to)468-471
Number of pages4
JournalNature
Volume487
Issue number7408
Early online date25 Jul 2012
DOIs
Publication statusPublished - 26 Jul 2012

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thinning
ice sheet
ice stream
ice
basin
glacial erosion
ice margin
warm water
continental shelf
trough
perturbation
geology
radar
topography
gravity
loss
sea

Keywords

  • geology
  • earth sciences
  • geophysics
  • climate science

Cite this

Bingham, R. G., Ferraccioli, F., King, E. C., Larter, R. D., Pritchard, H. D., Smith, A. M., & Vaughan, D. G. (2012). Inland thinning of West Antarctic Ice Sheet steered along subglacial rifts. Nature, 487(7408), 468-471. https://doi.org/10.1038/nature11292

Inland thinning of West Antarctic Ice Sheet steered along subglacial rifts. / Bingham, Robert George; Ferraccioli, Fausto; King, Edward C.; Larter, Robert D.; Pritchard, Hamish D.; Smith, Andrew M.; Vaughan, David G.

In: Nature, Vol. 487, No. 7408, 26.07.2012, p. 468-471.

Research output: Contribution to journalArticle

Bingham, RG, Ferraccioli, F, King, EC, Larter, RD, Pritchard, HD, Smith, AM & Vaughan, DG 2012, 'Inland thinning of West Antarctic Ice Sheet steered along subglacial rifts', Nature, vol. 487, no. 7408, pp. 468-471. https://doi.org/10.1038/nature11292
Bingham RG, Ferraccioli F, King EC, Larter RD, Pritchard HD, Smith AM et al. Inland thinning of West Antarctic Ice Sheet steered along subglacial rifts. Nature. 2012 Jul 26;487(7408):468-471. https://doi.org/10.1038/nature11292
Bingham, Robert George ; Ferraccioli, Fausto ; King, Edward C. ; Larter, Robert D. ; Pritchard, Hamish D. ; Smith, Andrew M. ; Vaughan, David G. / Inland thinning of West Antarctic Ice Sheet steered along subglacial rifts. In: Nature. 2012 ; Vol. 487, No. 7408. pp. 468-471.
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abstract = "Current ice loss from the West Antarctic Ice Sheet (WAIS) accounts for about ten per cent of observed global sea-level rise. Losses are dominated by dynamic thinning, in which forcings by oceanic or atmospheric perturbations to the ice margin lead to an accelerated thinning of ice along the coastline2. Although central to improving projections of future ice-sheet contributions to globalsea-level rise, the incorporation of dynamic thinning into models has been restricted by lack of knowledge of basal topography and subglacial geology so that the rate and ultimate extent of potential WAIS retreat remains difficult to quantify. Here we report the discovery of a subglacial basin under Ferrigno Ice Stream up to 1.5 kilometres deep that connects the ice-sheet interior to theBellingshausen Sea margin, and whose existence profoundly affects ice loss. We use a suite of ice-penetrating radar, magnetic and gravity measurements to propose a rift origin for the basin in association with the wider development of the West Antarctic rift system. The Ferrigno rift, overdeepened by glacial erosion, is a conduit which fed a major palaeo-ice stream on the adjacent continental shelf during glacial maxima. The palaeo-ice stream, in turn, eroded the ‘Belgica’ trough, which today routes warm openocean water back to the ice front to reinforce dynamic thinning.We show that dynamic thinning from both the Bellingshausen and Amundsen Sea region is being steered back to the ice-sheet interior along rift basins. We conclude that rift basins that cut across theWAIS margin can rapidly transmit coastally perturbed change inland, thereby promoting ice-sheet instability.",
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note = "Acknowledgements This study was supported by the Natural Environment Research Council (NERC/AFI/CGS/11/60) and British Antarctic Survey research programme Polar Science for Planet Earth. We acknowledge NASA Operation Ice Bridge for airborne ice-sounding data, A. G. C. Graham for bathymetry data and C. Griffiths for field assistance.",
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AU - Vaughan, David G.

N1 - Acknowledgements This study was supported by the Natural Environment Research Council (NERC/AFI/CGS/11/60) and British Antarctic Survey research programme Polar Science for Planet Earth. We acknowledge NASA Operation Ice Bridge for airborne ice-sounding data, A. G. C. Graham for bathymetry data and C. Griffiths for field assistance.

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N2 - Current ice loss from the West Antarctic Ice Sheet (WAIS) accounts for about ten per cent of observed global sea-level rise. Losses are dominated by dynamic thinning, in which forcings by oceanic or atmospheric perturbations to the ice margin lead to an accelerated thinning of ice along the coastline2. Although central to improving projections of future ice-sheet contributions to globalsea-level rise, the incorporation of dynamic thinning into models has been restricted by lack of knowledge of basal topography and subglacial geology so that the rate and ultimate extent of potential WAIS retreat remains difficult to quantify. Here we report the discovery of a subglacial basin under Ferrigno Ice Stream up to 1.5 kilometres deep that connects the ice-sheet interior to theBellingshausen Sea margin, and whose existence profoundly affects ice loss. We use a suite of ice-penetrating radar, magnetic and gravity measurements to propose a rift origin for the basin in association with the wider development of the West Antarctic rift system. The Ferrigno rift, overdeepened by glacial erosion, is a conduit which fed a major palaeo-ice stream on the adjacent continental shelf during glacial maxima. The palaeo-ice stream, in turn, eroded the ‘Belgica’ trough, which today routes warm openocean water back to the ice front to reinforce dynamic thinning.We show that dynamic thinning from both the Bellingshausen and Amundsen Sea region is being steered back to the ice-sheet interior along rift basins. We conclude that rift basins that cut across theWAIS margin can rapidly transmit coastally perturbed change inland, thereby promoting ice-sheet instability.

AB - Current ice loss from the West Antarctic Ice Sheet (WAIS) accounts for about ten per cent of observed global sea-level rise. Losses are dominated by dynamic thinning, in which forcings by oceanic or atmospheric perturbations to the ice margin lead to an accelerated thinning of ice along the coastline2. Although central to improving projections of future ice-sheet contributions to globalsea-level rise, the incorporation of dynamic thinning into models has been restricted by lack of knowledge of basal topography and subglacial geology so that the rate and ultimate extent of potential WAIS retreat remains difficult to quantify. Here we report the discovery of a subglacial basin under Ferrigno Ice Stream up to 1.5 kilometres deep that connects the ice-sheet interior to theBellingshausen Sea margin, and whose existence profoundly affects ice loss. We use a suite of ice-penetrating radar, magnetic and gravity measurements to propose a rift origin for the basin in association with the wider development of the West Antarctic rift system. The Ferrigno rift, overdeepened by glacial erosion, is a conduit which fed a major palaeo-ice stream on the adjacent continental shelf during glacial maxima. The palaeo-ice stream, in turn, eroded the ‘Belgica’ trough, which today routes warm openocean water back to the ice front to reinforce dynamic thinning.We show that dynamic thinning from both the Bellingshausen and Amundsen Sea region is being steered back to the ice-sheet interior along rift basins. We conclude that rift basins that cut across theWAIS margin can rapidly transmit coastally perturbed change inland, thereby promoting ice-sheet instability.

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