Cosmogenic nuclide evidence for enhanced sensitivity of an East Antarctic ice stream to change during the last deglaciation
作者： Duanne A White , David Fink , Damian B Gore , None
DOI: 10.1130/G31591.1
关键词: Ice stream 、 Deglaciation 、 Geology 、 Ice sheet 、 Antarctic sea ice 、 Antarctic ice sheet 、 Sea ice 、 Oceanography 、 Paleontology 、 Ice core 、 Ice shelf
摘要: Glacial sediments from the Prince Charles Mountains, East Antarctica, record late Pleistocene ice thickness variability in Lambert Glacier–Amery Ice Shelf system, one of world9s largest drainages. A former glacial limit, demarcated by minimally weathered deposits, follows a concave longitudinal profile, indicating zone strong streaming through northernmost 500 km Graben. In situ 10 Be and 26 Al exposure ages these relatively unweathered deposits indicate that most recent phase lowering occurred between ca. 18 8 ka, preceding as many 6 k.y. deglaciation adjacent coastal regions. Earlier onset an area suggests heightened sensitivity Antarctic Sheet to climate sea-level changes following Last Maximum than previously recognized.
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