Post-LGM evolution of Reedy Glacier, Antarctica,

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Presentation transcript:

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 R O S S S E A

ROSS SEA Hatherton Glacier c. 6800 yr BP McMurdo Sound c. 7400 yr BP W A I S E A I S Roosevelt Island c. 3200 yr BP Hatherton Glacier c. 6800 yr BP McMurdo Sound c. 7400 yr BP ROSS SEA Terra Nova Bay c. 7800 yr BP

Reedy Glacier, 86˚S ROSS SEA Hatherton Glacier c. 6800 yr BP W A I S E A I S Roosevelt Island c. 3200 yr BP Hatherton Glacier c. 6800 yr BP McMurdo Sound c. 7400 yr BP ROSS SEA Terra Nova Bay c. 7800 yr BP

EAIS WAIS Downglacier (north-west) from Quartz Hills, 85˚56’S Watson Escarpment from Caloplaca Hills, 86˚07’S

Hypotheses Stabilisation of Reedy Glacier during the Holocene suggests stability of Ross Sea grounding line 2) Modern instability of Reedy Glacier suggests ongoing recession of Ross Sea grounding line

E A I S Strickland Nunatak: 40 m Hatcher Bluff: 40 m Metavolcanic Mtn: 40 m Shapley Ridge: 40 m Polygon Spur: 40-90 m Caloplaca Hills: 150 m Quartz Hills: 300 m Langford Peak: >110 m Cohen Nunatak: >110 m

Reedy III drift (LGM) overlying old surface, Quartz Hills

Pre-LGM deposits, Quartz Hills W A I S Pre-LGM deposits, Quartz Hills

Surficial geology and geomorphology of Polygon Spur, Reedy Glacier

Surficial geology and geomorphology of Quartz Hills

Present and former surface profiles of Reedy Glacier

Glacial deposits have allowed reconstruction of Reedy Glacier at the LGM WAIS was c. 600 m thicker at the LGM than at present