Ocean forced variability of Totten Glacier mass loss

Jason L. Roberts; Benjamin K Galton-fenzi; Fernando S Paolo; Claire B Donnelly; David E Gwyther; Laurie Padman; Duncan Young; Roland Warner; Jamin Greenbaum; Helen A Fricker; Antony J Payne; Stephen Cornford; Anne Le Brocq; Tas Van Ommen; Don Blankenship; Martin J Siegert

doi:10.1144/SP461.6

Ocean forced variability of Totten Glacier mass loss

Jason L. Roberts, Benjamin K Galton-fenzi, Fernando S Paolo, Claire B Donnelly, David E Gwyther, Laurie Padman, Duncan Young, Roland Warner, Jamin Greenbaum, Helen A Fricker, Antony J Payne, Stephen Cornford, Anne Le Brocq, Tas Van Ommen, Don Blankenship, Martin J Siegert

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Abstract

A large volume of the East Antarctic Ice Sheet drains through the Totten Glacier (TG) and is thought to be a potential source of substantial global sea level rise over the coming centuries. We show the surface velocity and height of the floating part of TG, which buttresses the grounded component, have varied substantially over two decades (1989–2011), with variations in surface height strongly anti-correlated with simulated basal melt rates (r=0.70, p<0.05). Coupled glacier/ice-shelf simulations confirm ice flow and thickness respond to both basal melting of the ice shelf and grounding on bed obstacles. We conclude the observed variability of TG is primarily ocean-driven. Ocean warming in this region will lead to enhanced ice-sheet dynamism and loss of upstream grounded ice.

Original language	English
Pages (from-to)	175-186
Number of pages	12
Journal	Geological Society Special Publications
Volume	461
Early online date	23 Aug 2017
DOIs	https://doi.org/10.1144/SP461.6
Publication status	Published - 23 Aug 2017

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iSTAR-C - Dynamical control on the response of Pine Island Glacier
Payne, A. J. (Principal Investigator)
1/01/13 → 1/01/17
Project: Research

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Roberts, J. L., Galton-fenzi, B. K., Paolo, F. S., Donnelly, C. B., Gwyther, D. E., Padman, L., Young, D., Warner, R., Greenbaum, J., Fricker, H. A., Payne, A. J., Cornford, S., Le Brocq, A., Ommen, T. V., Blankenship, D., & Siegert, M. J. (2017). Ocean forced variability of Totten Glacier mass loss. Geological Society Special Publications, 461, 175-186. https://doi.org/10.1144/SP461.6

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title = "Ocean forced variability of Totten Glacier mass loss",

abstract = "A large volume of the East Antarctic Ice Sheet drains through the Totten Glacier (TG) and is thought to be a potential source of substantial global sea level rise over the coming centuries. We show the surface velocity and height of the floating part of TG, which buttresses the grounded component, have varied substantially over two decades (1989–2011), with variations in surface height strongly anti-correlated with simulated basal melt rates (r=0.70, p<0.05). Coupled glacier/ice-shelf simulations confirm ice flow and thickness respond to both basal melting of the ice shelf and grounding on bed obstacles. We conclude the observed variability of TG is primarily ocean-driven. Ocean warming in this region will lead to enhanced ice-sheet dynamism and loss of upstream grounded ice.",

author = "Roberts, {Jason L.} and Galton-fenzi, {Benjamin K} and Paolo, {Fernando S} and Donnelly, {Claire B} and Gwyther, {David E} and Laurie Padman and Duncan Young and Roland Warner and Jamin Greenbaum and Fricker, {Helen A} and Payne, {Antony J} and Stephen Cornford and {Le Brocq}, Anne and Ommen, {Tas Van} and Don Blankenship and Siegert, {Martin J}",

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doi = "10.1144/SP461.6",

language = "English",

volume = "461",

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journal = "Geological Society Special Publications",

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T1 - Ocean forced variability of Totten Glacier mass loss

AU - Roberts, Jason L.

AU - Galton-fenzi, Benjamin K

AU - Paolo, Fernando S

AU - Donnelly, Claire B

AU - Gwyther, David E

AU - Padman, Laurie

AU - Young, Duncan

AU - Warner, Roland

AU - Greenbaum, Jamin

AU - Fricker, Helen A

AU - Payne, Antony J

AU - Cornford, Stephen

AU - Le Brocq, Anne

AU - Ommen, Tas Van

AU - Blankenship, Don

AU - Siegert, Martin J

PY - 2017/8/23

Y1 - 2017/8/23

N2 - A large volume of the East Antarctic Ice Sheet drains through the Totten Glacier (TG) and is thought to be a potential source of substantial global sea level rise over the coming centuries. We show the surface velocity and height of the floating part of TG, which buttresses the grounded component, have varied substantially over two decades (1989–2011), with variations in surface height strongly anti-correlated with simulated basal melt rates (r=0.70, p<0.05). Coupled glacier/ice-shelf simulations confirm ice flow and thickness respond to both basal melting of the ice shelf and grounding on bed obstacles. We conclude the observed variability of TG is primarily ocean-driven. Ocean warming in this region will lead to enhanced ice-sheet dynamism and loss of upstream grounded ice.

AB - A large volume of the East Antarctic Ice Sheet drains through the Totten Glacier (TG) and is thought to be a potential source of substantial global sea level rise over the coming centuries. We show the surface velocity and height of the floating part of TG, which buttresses the grounded component, have varied substantially over two decades (1989–2011), with variations in surface height strongly anti-correlated with simulated basal melt rates (r=0.70, p<0.05). Coupled glacier/ice-shelf simulations confirm ice flow and thickness respond to both basal melting of the ice shelf and grounding on bed obstacles. We conclude the observed variability of TG is primarily ocean-driven. Ocean warming in this region will lead to enhanced ice-sheet dynamism and loss of upstream grounded ice.

U2 - 10.1144/SP461.6

DO - 10.1144/SP461.6

M3 - Article (Academic Journal)

SN - 0305-8719

VL - 461

SP - 175

EP - 186

JO - Geological Society Special Publications

JF - Geological Society Special Publications

ER -

Ocean forced variability of Totten Glacier mass loss

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iSTAR-C - Dynamical control on the response of Pine Island Glacier

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