Penny ice cap cores, Baffin Island, Canada, and the Wisconsinan Foxe Dome connection: Two states of Hudson Bay ice cover

被引：87

作者：

Fisher, DA

Koerner, RM

Bourgeois, JC

Zielinski, G

Wake, C

Hammer, CU

Clausen, HB

Gundestrup, N

Johnsen, S

Goto-Azuma, K

Hondoh, T

Blake, E

Gerasimoff, M

机构：

[1] Geol Survey Canada, Terrain Sci Div, Ottawa, ON K1A 0E8, Canada

[2] Univ New Hampshire, Glacier Res Grp, Durham, NH 03824 USA

[3] Univ Copenhagen, Niels Bohr Inst, Dept Geophys, DK-2100 Copenhagen, Denmark

[4] Nagaoka Inst Snow & Ice Studies, Nagaoka, Niigata 940, Japan

[5] Hokkaido Univ, Inst Low Temp Sci, Sapporo, Hokkaido 060, Japan

[6] Icefield Instruments, Whitehorse, YT Y1A 5H4, Canada

来源：

SCIENCE | 1998年 / 279卷 / 5351期

关键词：

D O I：

10.1126/science.279.5351.692

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Ice cores from Penny Ice Cap, Baffin Island, Canada, provide continuous Holocene records of oxygen isotopic composition (delta(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 delta(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 Fore Dome and Fore Ridge of the Laurentide Ice Sheet. The LGM delta(18)O values suggest thick ice frozen to the bed of Hudson Bay.

引用

页码：692 / 695

页数：4

共 36 条

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