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R O S S S E A
Post-LGM evolution of Reedy Glacier, Antarctica, as an indicator of current ice sheet stability
Gordon Bromley, Brenda Hall, Claire Todd, John Stone, Howard Conway, Maurice Conway
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ROSS SEA
W A I S
E A I S
Terra Nova Bay c. 7800 yr BP
McMurdo Sound c. 7400 yr BP
Hatherton Glacier c. 6800 yr BP
Roosevelt Island c. 3200 yr BP
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ROSS SEA
W A I S
Terra Nova Bay c. 7800 yr BP
McMurdo Sound c. 7400 yr BP
Hatherton Glacier c. 6800 yr BP
Roosevelt Island c. 3200 yr BP
E A I S
Reedy Glacier, 86˚S
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WAIS
EAIS
Downglacier (north-west) from Quartz Hills, 85˚56’S
Watson Escarpment from Caloplaca Hills, 86˚07’S
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Hypotheses
2) Modern instability of Reedy Glacier suggests ongoing recession of Ross Sea grounding line
1) Stabilisation of Reedy Glacier during the Holocene suggests stability of Ross Sea grounding line
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Hatcher Bluff: 40 m
Polygon Spur: 40-90 m
Caloplaca Hills: 150 m
Quartz Hills: 300 m
Cohen Nunatak: >110 m
E A I S
Langford Peak: >110 m
Shapley Ridge: 40 m
Metavolcanic Mtn: 40 m
Strickland Nunatak: 40 m
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Reedy III drift (LGM) overlying old surface, Quartz Hills
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W A I SPre-LGM deposits, Quartz Hills
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Surficial geology and geomorphology of Polygon Spur, Reedy Glacier
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Surficial geology and geomorphology of Quartz Hills
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Present and former surface profiles of Reedy Glacier
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• Glacial deposits have allowed reconstruction of Reedy Glacier at the LGM
• WAIS was c. 600 m thicker at the LGM than at present