Rapid early Holocene deglaciation of the Laurentide ice sheet

被引：257

作者：

Carlson, Anders E. ^{[1
]}

Legrande, Allegra N. ^{[2
,3
]}

Oppo, Delia W. ^{[4
]}

Came, Rosemarie E. ^{[5
]}

Schmidt, Gavin A. ^{[2
,3
]}

Anslow, Faron S. ^{[6
]}

Licciardi, Joseph M. ^{[7
]}

Obbink, Elizabeth A. ^{[1
]}

机构：

[1] Univ Wisconsin, Dept Geol & Geophys, Madison, WI 53706 USA

[2] Columbia Univ, NASA, Goddard Inst Space Studies, New York, NY 10025 USA

[3] Columbia Univ, Ctr Climate Syst Res, New York, NY 10025 USA

[4] Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA

[5] CALTECH, Pasadena, CA 91125 USA

[6] Univ British Columbia, Vancouver, BC V6T 1Z4, Canada

[7] Univ New Hampshire, Dept Earth Sci, Durham, NH 03824 USA

来源：

NATURE GEOSCIENCE | 2008年 / 1卷 / 09期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1038/ngeo285

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The demise of the Laurentide ice sheet during the early Holocene epoch is the most recent and best constrained disappearance of a large ice sheet in the Northern Hemisphere, and thus allows an assessment of rates of ice-sheet decay as well as attendant contributions to sea level rise. Here, we use terrestrial and marine records of the deglaciation to identify two periods of rapid melting during the final demise of the Laurentide ice sheet, when melting ice contributed about 1.3 and 0.7 cm of sea level rise per year, respectively. Our simulations with a fully coupled ocean-atmosphere model suggest that increased ablation due to enhanced early Holocene boreal summer insolation was the predominant cause of Laurentide ice-sheet retreat. Although the surface radiative forcing in boreal summer during the early Holocene is twice as large as the greenhouse-gas forcing expected by the year 2100, the associated increase in summer surface air temperatures is very similar. We conclude that our geologic evidence for a rapid retreat of the Laurentide ice sheet may therefore describe a prehistoric precedent for mass balance changes of the Greenland ice sheet over the coming century.

引用

页码：620 / 624

页数：5