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First exposure ages from the Amundsen Sea Embayment, West Antarctica: The Late Quaternary context for recent thinning of Pine Island, Smith, and Pope Glaciers

¹ British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK
² Department of Geography, Durham University, South Road, Durham DH1 3LE, UK and British Antarctic Survey, High Cross, Madingley Road, Cambridge CB3 0ET, UK
³ Alfred-Wegener-Institut für Polar- und Meeresforschung, Postfach 120161, D-27515 Bremerhaven, Germany

View larger version (77K): [in this window] [in a new window]   Figure 1. Map of Pine Island Bay sector showing the sampling sites for surface exposure dating. Gray-scale image onshore is part of the MODIS (moderate-resolution imaging spectro-radiometer) Mosaic of Antarctica (National Aeronautics and Space Administration Goddard Space Flight Center). Contours are at 200 m intervals.

View larger version (85K): [in this window] [in a new window]   Figure 2. A: View from Turtle Rock looking south toward Dorrel Rock and Mount Takahe. Till containing granite erratics (circled) is visible in foreground. B: Gneissic erratic TR1 near summit of Turtle Rock. C: Isolated granite erratic MM2 at Mount Manthe. D: Striations on granite bedrock at Hunt Bluff. E: View of ice-free unnamed island. Arrow points to sample location. Present-day ice margin on Canisteo Peninsula is in the background. F: Erratic boulder ISL1 on the unnamed island.

View larger version (12K): [in this window] [in a new window]   Figure 3. 10Be exposure age versus elevation for samples. A: Turtle Rock (TR). B: Mount Manthe (MM). C: Unnamed island (ISL) near Canisteo Peninsula. Short-dashed lines are present-day ice elevations, and dotted lines are average ice thinning rates. Error bars are 1.