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Configuration of the Northern Antarctic Peninsula Ice Sheet at LGM based on a new synthesis of seabed imagery

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Title
Configuration of the Northern Antarctic Peninsula Ice Sheet at LGM based on a new synthesis of seabed imagery
Authors
Lavoie, Caroline
Domack, Eugene W.
Pettit, E. C.
Scambos, T. A.
Larter, R. D.
Schenke, Hans Werner
Yoo, Kyu-Cheul
Gutt, Julian
Wellner, Julia
Canals, M.
Anderson, J. B.
Amblas, D.
Subject
Physical Geography; Geology
Keywords
Araon; RVIB Nathaniel B. Palmer; RV Polarstern; RV- RRS James Clark Ross; RV-BIO Hesperides
Issue Date
2015
Citation
Lavoie, C., et al. 2015. Configuration of the Northern Antarctic Peninsula Ice Sheet at LGM based on a new synthesis of seabed imagery. The Cryosphere, 9: 613-629.
Abstract
We present a new seafloor map for the northern Antarctic Peninsula (AP), including swath multibeam data sets from five national programs. Our map allows for the examination and interpretation of Last Glacial Maximum (LGM) paleo-ice-flow paths developed on the seafloor from the preservation of mega-scale glacial lineations, drumlinized features, and selective linear erosion. We combine this with terrestrial observations of flow direction to place constraints on ice divides and ice domes on the AP continental shelf during the LGM time interval. The results show a flow bifurcation as ice exits the Larsen B embayment. Flow emanating off the Seal Nunataks (including Robertson Island) is directed toward the southeast, then eastward as the flow transits toward the Robertson Trough. A second, stronger “streaming flow” is directed toward the southeast, then southward as ice overflowed the tip of the Jason Peninsula to reach the southern perimeter of the embayment. Our reconstruction also refines the extent of at least five other distinct paleo-icestream systems that, in turn, serve to delineate seven broad regions where contemporaneous ice domes must have been centered on the continental shelf at LGM. Our reconstruction is more detailed than other recent compilations because we followed specific ice-flow indicators and have kept tributary flow paths parallel.
DOI
10.5194/tc-9-613-2015
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