Configuration of the Northern Antarctic Peninsula Ice Sheet at LGM based on a new synthesis of seabed imagery
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- Configuration of the Northern Antarctic Peninsula Ice Sheet at LGM based on a new synthesis of seabed imagery
- Lavoie, Caroline
Domack, Eugene W.
Pettit, E. C.
Scambos, T. A.
Larter, R. D.
Schenke, Hans Werner
Anderson, J. B.
- Physical Geography; Geology
- Araon; RVIB Nathaniel B. Palmer; RV Polarstern; RV- RRS James Clark Ross; RV-BIO Hesperides
- Issue Date
- 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.
- 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.
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