Surface-melt driven Laurentide Ice Sheet retreat during the early Holocene

被引：35

作者：

Carlson, A. E. ^{[1
]}

Anslow, F. S. ^{[2
]}

Obbink, E. A. ^{[1
]}

LeGrande, A. N. ^{[3
,4
]}

Ullman, D. J. ^{[1
]}

Licciardi, J. M. ^{[5
]}

机构：

[1] Univ Wisconsin, Dept Geosci, Madison, WI 53706 USA

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

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

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

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

来源：

GEOPHYSICAL RESEARCH LETTERS | 2009年 / 36卷

基金：

美国国家科学基金会;

关键词：

ENERGY-BALANCE; GREENLAND; GLACIER; CLIMATE; ACCELERATION; DEGLACIATION;

D O I：

10.1029/2009GL040948

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

To better understand mechanisms of ice-sheet decay, we investigate the surface mass balance of the Laurentide Ice Sheet (LIS) during the early Holocene, a period of known rapid LIS retreat. We use a surface energy-mass balance model (EMBM) driven with conditions derived from an equilibrium atmosphere-ocean general circulation model 9 kilo-years ago simulation. Our EMBM indicates a net LIS surface mass balance of -0.67 +/- 0.13 m yr(-1), with losses primarily due to enhanced boreal summer insolation and warmer summers. This rate of loss compared to LIS volume reconstructions suggests that surface ablation accounted for 74 +/- 22% of the LIS mass loss with the remaining loss likely driven by dynamics resulting in basal sliding and calving. Thus surface melting likely played a governing role in the retreat and disappearance of this ice sheet. Citation: Carlson, A. E., F. S. Anslow, E. A. Obbink, A. N. LeGrande, D. J. Ullman, and J. M. Licciardi (2009), Surface-melt driven Laurentide Ice Sheet retreat during the early Holocene, Geophys. Res. Lett., 36, L24502, doi:10.1029/2009GL040948.

引用

页数：5

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