Subglacial conditions during and after stoppage of an Antarctic Ice Stream: Is reactivation imminent?

被引：49

作者：

Vogel, SW

Tulaczyk, S

Kamb, B

Engelhardt, H

Carsey, FD

Behar, AE

Lane, AL

Joughin, I

机构：

[1] Univ Calif Santa Cruz, Dept Earth Sci, Santa Cruz, CA 95064 USA

[2] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA

[3] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2005年 / 32卷 / 14期

关键词：

D O I：

10.1029/2005GL022563

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Borehole observations from the base of the West-Antarctic Ice Sheet (WAIS) reveal the presence of a 10 to 15 m thick accretionary basal ice layer in the upstream area of Kamb Ice Stream (KIS). This ice layer has formed over a time of several thousand years by freeze-on of subglacial water to the ice base and has recorded during this time basal conditions upstream of its current location. Analysis of samples and videos sequences from boreholes drilled to the bottom of KIS confirms that KIS-stoppage was due to basal freeze-on and that relubrication of the ice stream is well underway. These results further suggest that ice stream cyclicity may be shorter than expected (1000s of years) and that a restart of KIS may be imminent within decades to centuries.

引用

页码：1 / 4

页数：4

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