 |
| Titel |
Configuration of the Northern Antarctic Peninsula Ice Sheet at LGM based on a new synthesis of seabed imagery |
| VerfasserIn |
C. Lavoie, E. W. Domack, E. C. Pettit, T. A. Scambos, R. D. Larter, H.-W. Schenke, K. C. Yoo, J. Gutt, J. Wellner, M. Canals, J. B. Anderson, D. Amblas |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1994-0416
|
| Digitales Dokument |
URL |
| Erschienen |
In: The Cryosphere ; 9, no. 2 ; Nr. 9, no. 2 (2015-04-01), S.613-629 |
| Datensatznummer |
250116773
|
| Publikation (Nr.) |
 copernicus.org/tc-9-613-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
| 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-ice-stream 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. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|