Configuration of the Northern Antarctic Peninsula Ice Sheet at LGM based on a new synthesis of seabed imagery
| Autor: | Ted Scambos, Kyu-Cheul Yoo, Erin C. Pettit, Robert D Larter, Caroline Lavoie, John B. Anderson, Miquel Canals, Julia S. Wellner, David Amblas, Julian Gutt, Eugene W Domack, Hans Werner Schenke |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
lcsh:GE1-350
geography geography.geographical_feature_category 010504 meteorology & atmospheric sciences Continental shelf Ice stream lcsh:QE1-996.5 Last Glacial Maximum Antarctic sea ice 010502 geochemistry & geophysics 01 natural sciences Ice shelf lcsh:Geology Glacial period Ice sheet Seabed gouging by ice Geomorphology Geology lcsh:Environmental sciences 0105 earth and related environmental sciences Earth-Surface Processes Water Science and Technology |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP The Cryosphere, Vol 9, Iss 2, Pp 613-629 (2015) |
| ISSN: | 1994-0424 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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