Penny Ice Cap Cores, Baffin Island, Canada, and the Wisconsinan Foxe Dome Connection: Two States of Hudson Bay Ice Cover

Authors

David Fisher, Geological Survey of Canada
Roy M. Koerner, Geological Survey of Canada
Jocelyne Bourgeois, Geological Survey of Canada
Gregory A. Zielinski, University of New Hampshire - Main Campus
Cameron P. Wake, University of New Hampshire - Main CampusFollow
C U. Hammer, University of Copenhagen
Henrick B. Clausen, University of Copenhagen
Niels S. Gundestrup, University of CopenhagenFollow
S Johnsen, University of Copenhagen
Kumiko Goto-Azuma, National Institute of Polar Research, Tokyo
T Hondoh, Hokkaido University
E Blake, Icefield Instruments, Canada
Michael Gerasimoff, Icefield Instruments, CanadaFollow

Abstract

Ice cores from Penny Ice Cap, Baffin Island, Canada, provide continuous Holocene records of oxygen isotopic composition (d18O, proxy for temperature) and atmospheric impurities. A time scale was established with the use of altered seasonal variations, some volcanic horizons, and the age for the end of the Wisconsin ice age determined from the GRIP and GISP2 ice cores. There is pre-Holocene ice near the bed. The change in d18O since the last glacial maximum (LGM) is at least 12.5 per mil, compared with an expected value of 7 per mil, suggesting that LGM ice originated at the much higher elevations of the then existing Foxe Dome and Foxe Ridge of the Laurentide Ice Sheet. The LGM d18O values suggest thick ice frozen to the bed of Hudson Bay.

Department

Earth Sciences, Earth Systems Research Center

Publication Date

1-30-1998

Journal Title

Science

Publisher

American Association for the Advancement of Science (AAAS)

Digital Object Identifier (DOI)

10.1126/science.279.5351.692

Document Type

Article

Recommended Citation

D. A. Fisher, "Penny Ice cap cores, Baffin island, Canada, and the Wisconsinan Foxe dome connection: Two states of Hudson bay ice cover," Science, vol. 279, no. 5351, pp. 692–695, Jan. 1998.