Evidence that Berkner Island, Antarctica, was not Over-ridden During the Last Glacial Maximum

HR: 0800h
AN: C21B-1088 [Abstracts]
TI: Evidence that Berkner Island, Antarctica, was not Over-ridden During the Last Glacial Maximum
AU: * Mulvaney, R
EM: r.mulvaney@bas.ac.uk
AF: British Antarctic Survey, Madingley Road, Cambridge, CB3 0ET United Kingdom
AU: Arrowsmith, C
C21B-1088 AF: Isotope Geosciences Laboratory, Natural Environment Research Council, Keyworth, Nottingham, NG12 5GG United Kingdom
AU: Roberts, S
C21B-1088 AF: British Antarctic Survey, Madingley Road, Cambridge, CB3 0ET United Kingdom
AU: Hillenbrand, C
C21B-1088 AF: British Antarctic Survey, Madingley Road, Cambridge, CB3 0ET United Kingdom
AU: Hodgson, D
C21B-1088 AF: British Antarctic Survey, Madingley Road, Cambridge, CB3 0ET United Kingdom
AU: Barnola, J
C21B-1088 AF: Laboratoire de Glaciologie et GＰphysique de l'Environnement, BP96, St Martin d'Heres, 38402 France
AB: Ice sheet models display a range of values for the extent and thickness of the Antarctic Ice Sheet (AIS) during the last glacial maximum. They differ in whether Berkner Island, at the southern end of the Weddell Sea was over-ridden by the main IS, and the timing of the point when it became an independent ice sheet. A recent ice core drilling project penetrated 948 m of ice on Berkner Island to reach a bed of virtually pure quartz sand, with an intriguing origin. Initial results from the stable isotope composition of the ice core make it clear that Berkner Island was not over-ridden by ice from the AIS, and must have been an independent ice sheet throughout the glacial cycle.
DE: 1827 Glaciology (0736, 0776, 1863)
DE: 4932 Ice cores (0724)
DE: 9310 Antarctica (4207)
SC: Cryosphere [C]
MN: Fall Meeting 2005