Penny Ice Cap Cores, Baffin Island, Canada, and the Wisconsinan Foxe Dome Connection: Two States of Hudson Bay Ice Cover-Reference-Cited by-同舟云学术

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

Published:1998-01-30 Issue:5351 Volume:279 Page:692-695
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Fisher David A.¹²³⁴⁵,Koerner Roy M.¹²³⁴⁵,Bourgeois Jocelyne C.¹²³⁴⁵,Zielinski Greg¹²³⁴⁵,Wake Cameron¹²³⁴⁵,Hammer Claus U.¹²³⁴⁵,Clausen H. B.¹²³⁴⁵,Gundestrup N.¹²³⁴⁵,Johnsen Sigfus¹²³⁴⁵,Goto-Azuma Kumiko¹²³⁴⁵,Hondoh Takeo¹²³⁴⁵,Blake Erik¹²³⁴⁵,Gerasimoff Mike¹²³⁴⁵

Affiliation:

1. D. A. Fisher, R. M. Koerner, J. C. Bourgeois, Terrain Sciences Division, Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8, Canada.

2. G. Zielinski and C. Wake, Glacier Research Group, Morse Hall, University of New Hampshire, Durham, NH 03824–3525, USA.

3. C. U. Hammer, H. B. Clausen, N. Gundestrup, S. Johnsen, Niels Bohr Institute, Department of Geophysics, University of Copenhagen, Rockefeller Complex, Juliane Maries Vej 30, Copenhagen ⊘, Denmark DK-2100.

4. K. Goto-Azuma, Nagaoka Institute of Snow and Ice Studies, 187–16 Suyoshi-machi, Nagaoka-shi, Niigata-ken 940, Japan.

5. T. Hondoh, Institute of Low Temperature Science, Hokkaido University, Sapporo 060, Japan.

Abstract

Ice cores from Penny Ice Cap, Baffin Island, Canada, provide continuous Holocene records of oxygen isotopic composition (δ 18 O, 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 δ 18 O 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 δ 18 O values suggest thick ice frozen to the bed of Hudson Bay.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference42 articles.

1. A. S. Dyke and V. K. Prest “Paleogeography of Northern North America 18000–5000 Years Ago ” Geol. Surv. Can. Map 1703A (1987)

2. D. A. Fisher N. Reeh K. Langley Geogr. Phys. Quat. 39 229 (1985).

3. A. S. Dyke Arct. Alp. Res. 11 179 (1979).

4. The melt percent is that of the bubble-free ice after correction is made for density differences. Bubble-free ice is formed by summer melt that subsequently refreezes in the firn (31) which contains more air bubbles.

5. The isotope composition δ 18 O in units of per mil is 1000( R sample − R SMOW )/ R SMOW where R = [ 18 O]/[ 16 O] the square brackets denoting number concentration and SMOW being standard mean ocean water.

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