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Geology; March 2005; v. 33; no. 3; p. 173-176; DOI: 10.1130/G21203.1
© 2005 Geological Society of America
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Early Holocene retreat of the George VI Ice Shelf, Antarctic Peninsula

M.J. Bentley*,1, D.A. Hodgson*,2, D.E. Sugden3, S.J. Roberts4, J.A. Smith5, M.J. Leng6 and C. Bryant7

1 Department of Geography, University of Durham, South Road, Durham DH1 3LE, UK
2 British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
3 Institute of Geography, School of GeoSciences, University of Edinburgh, Drummond Street, Edinburgh EH8 9XP, UK
4 British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
5 Department of Geography, University of Durham, South Road, Durham DH1 3LE, UK, and British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
6 Natural Environment Research Council Isotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottingham NG12 5GG, UK, and School of Geography, University of Nottingham, Nottingham NG7 2RD, UK
7 Natural Environment Research Council Radiocarbon Laboratory, Scottish Enterprise Technology Park, East Kilbride, Glasgow G75 OQF, UK

The recent collapse of several Antarctic Peninsula ice shelves has been linked to rapid regional atmospheric warming during the twentieth century. New high-resolution lake sediment records of Holocene ice-shelf behavior show that the George VI Ice Shelf was absent beginning ca. 9595 calibrated (cal.) yr B.P., but reformed by ca. 7945 cal. yr B.P. This retreat immediately followed a period of maximum Holocene warmth that is recorded in some ice cores and occurred at the same time as an influx of warmer ocean water onto the Antarctic Peninsula shelf. The absence of the ice shelf suggests that early Holocene ocean-atmosphere variability in the Antarctic Peninsula was greater than that measured in recent decades.

Key Words: ice shelves • Antarctic Peninsula • Holocene • paleoclimate • Circumpolar Deep Water




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